KR102229191B1 - Calibration system of direction finding equipment - Google Patents

Abstract

According to one embodiment, provided is a correction system for a direction finding device, which comprises: a transmission signal generating device for radiating a transmission signal toward an aerial vehicle on which the direction finding device is mounted; a transmission signal receiving device for generating correction data by using a reception signal obtained by receiving the transmission signal from the transmission signal generating device; and a central control device for processing the correction data to generate final correction data.

Description

Calibration system for direction finding equipment

The present disclosure relates to a correction system for a direction finding device.

Direction finding (DF) technology is a technology that finds the direction of radar, guided weapons, or communication equipment using electromagnetic waves to track a target using electromagnetic waves, and is the core of electronic warfare support (ES) equipment. do. The direction information obtained through this is used as pre-processed data of a signal processor to improve the efficiency of signal analysis, or is used in electronic attack (EA) equipment to enable effective jamming.

Direction detection method, which detects the direction using a directional rotating antenna with a narrow beam width, and performs direction detection by comparing the amplitude difference between received signals using multiple antennas. Various methods have been studied and applied, such as phase comparison direction detection using phase difference between signals, and amplitude-phase comparison direction detection using both amplitude and phase difference between received signals.

The direction detection apparatus generally estimates an azimuth angle using correction data for an amplitude or a phase according to a method of performing direction detection. As a method of generating correction data used for direction detection, there is a method of obtaining through modeling a received signal in consideration of antenna arrangement and characteristics, and a method of obtaining correction data for each azimuth angle using a signal radiated for correction at a predetermined position. There is this.

The performance of a direction detection device that detects a direction using the amplitude and phase of a signal received by an antenna is greatly influenced by the gain pattern of the direction detection antennas receiving the signal, and the shape and material of the platform on which the antenna and the direction detection device are installed Receive. When detecting the direction of the signal source, the reflected wave of the received signal is generated according to the shape of the structure of the exterior of the platform, and distortion of the received signal may occur due to the exterior material and the reception antenna gain pattern. Therefore, it is necessary to perform correction for direction detection in the course of development of a direction detection device according to the frequency band and azimuth angle to detect the direction of the signal source, and load the corresponding correction data into the direction detection device.

The correction data acquired during the development of the direction finding device radiates a signal for the frequency band and azimuth to be detected in an environment where there is no reflected wave due to the surrounding environment, such as an electromagnetic chamber, and an antenna and a direction finder are installed. It consists of the received signal strength and phase value for each frequency and azimuth angle obtained by receiving a signal from the platform. In addition, in order to acquire correction data in the high frequency (HF) and very/ultra high frequency (V/UHF) bands, it is difficult to secure an electromagnetic anechoic chamber of a scale capable of eliminating the effect of reflected waves having a long wavelength in the corresponding band. Therefore, the correction must be performed in an open area where the influence of the reflected wave by the surrounding environment can be minimized.

When performing correction for a vehicle-based direction detection device, it is difficult to use the vehicle platform to be actually operated for correction, so a mock-up of similar appearance shape and material is used. However, when the mock-up is used, there is a difference in appearance from the platform to be actually operated, and the outdoor environment signal when performing the calibration, and the signals received for calibration, such as power supply and ground, which are different from the actual environment to be operated. Can affect the value of

Accordingly, there is a need for a correction system for a direction detection device mounted on a vehicle to be actually operated.

Jaewon Jang, & Jeungmin Joo. (2019). In-Flight Calibration Method for Direction Finding of Communication Signals based on Aviation Systems. JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE, 30(4), 290∼299

The problem to be solved by the present invention is to provide a flight correction system for a direction detection device.

The problems of the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

As a means for solving the above-described technical problem, a correction system for a direction detection device includes: a transmission signal generating device disposed on the ground, equipped with the direction detection device, and radiating a transmission signal toward an aircraft in flight; A transmission signal reception device mounted on the aircraft and generating correction data using a reception signal obtained by receiving the transmission signal from the transmission signal generation device; And a central control device disposed on the ground, controlling the transmission signal generating device to generate the transmission signal, and processing the correction data received from the transmission signal receiving device to generate final correction data.

The apparatus for generating a transmission signal includes: a GPS antenna for receiving a GPS signal; And a GPS receiver that obtains a 1-PPS signal from the GPS signal.

The transmission signal generating apparatus includes: a signal generator for generating the transmission signal; A high-power amplifier for amplifying the generated transmission signal to high power; A directional antenna radiating the amplified transmission signal; And a directional antenna controller for controlling the attitude of the directional antenna so that the directional antenna radiates the amplified transmission signal toward the vehicle based on the navigation data of the vehicle received from the central control device.

The signal generator generates the transmission signal of the number of frequencies included in the collected frequency list data received from the central control device every second by using the 1-PPS signal as a trigger.

The transmission signal receiving device receives the received signal of the number of frequencies included in the collected frequency list data received from the central control device as a trigger by using the 1-PPS signal obtained from the navigation device of the vehicle as a trigger. An FFT performing unit for transforming (FFT); A signal measuring unit configured to measure the phase and intensity of each reception channel of the fast Fourier transformed reception signal by the number of frequencies by using the 1-PPS signal as a trigger; A navigation method in which time data is generated by using the 1-PPS signal and a clock count value at the time when the FFT performing unit performs a fast Fourier transform, and navigation data is generated by using the attitude information of the aircraft obtained from the navigation device. A data generation unit; And a correction data generator configured to generate correction data using the time data and the navigation data.

The central control device includes a terrestrial data link device for receiving the correction data.

The central control unit includes a ground operation processor, and the ground operation processor includes: a collection list generation unit for generating collection frequency list data including a frequency for performing correction and a strength of a transmission signal; A data post-processing unit that filters the correction data to generate effective correction data; A direction detection accuracy calculator configured to calculate an accuracy of the direction detection of the direction detection device by using the effective correction data; And a final correction data calculation unit generating a correction data set by repeatedly acquiring the effective correction data, and generating final correction data by accumulating the correction data set.

The transmission signal generation device and the transmission signal reception device are synchronized with each other based on the 1-PPS signal of the GPS signal each obtained.

A correction method performed by a correction system including a transmission signal generation device, a transmission signal reception device, and a central control device to improve the accuracy of direction detection of a direction detection device mounted on an aircraft, comprises: (a) the transmission signal generation device Radiating a transmission signal toward the vehicle flying along a preset posture and movement path; (b) generating, by the transmission signal receiving apparatus, correction data using a received signal obtained by receiving the transmission signal; (c) generating effective correction data by filtering the correction data by the central control device; (d) calculating, by the central control device, an accuracy of direction detection by using the valid correction data; (e) obtaining a correction data set, which is a set of effective correction data, by repeatedly performing steps (a) to (d); (f) generating, by the central control device, final correction data by accumulating the correction data set; (g) calculating, by the central control device, accuracy of direction detection using the final correction data, and optimizing a baseline combination for each frequency; And (h) calculating, by the central control device, an accuracy of direction detection for the direction detection device provided with the final correction data and the optimized baseline combination.

The preset posture and the movement path are set from a range of an azimuth angle and an elevation angle selected based on mathematically pre-calculated correction data.

Since it is possible to obtain correction data for the direction detection device based on the actual vehicle to be operated, reliable direction detection is possible in an actual operation environment.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a diagram illustrating an example of a correction system.
2 is a diagram illustrating an example of an apparatus for receiving a transmission signal.
3 is a diagram illustrating an example of an apparatus for generating a transmission signal.
4 is a diagram for describing an example of a central control device.
5 is a diagram illustrating an example of a user operation program.
6 is a diagram for describing an example of a correction method.
7 is a diagram for describing an example of a correction method.

Hereinafter, embodiments for illustration only will be described in detail with reference to the accompanying drawings. It goes without saying that the following description is only for specifying the embodiments and does not limit or limit the scope of the invention. What can be easily inferred by experts in the art from the detailed description and examples is construed as belonging to the scope of the rights.

The terms “consisting of” or “comprising” as used herein should not be interpreted as necessarily including all of the various components or various steps described in the specification, and some components or some steps thereof. It should be construed that they may not be included, or may further include additional elements or steps.

Terms used in the present specification have selected general terms that are currently widely used as possible while taking functions of the present invention into consideration, but this may vary according to the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

1 is a diagram illustrating an example of a correction system. 2 is a diagram illustrating an example of an apparatus for receiving a transmission signal. 3 is a diagram illustrating an example of an apparatus for generating a transmission signal. 4 is a diagram for describing an example of a central control device.

Referring to FIGS. 1 to 4, the correction system 10 is a system for correcting a direction detection device mounted on the aircraft 1 by using the aircraft 1 that is actually flying. The aircraft (1) is not a mock-up, it is an actual aircraft to be operated.

The correction system 10 controls the transmission signal generating device 200 on the ground and receives the correction data transmitted by the vehicle 1 remotely to generate the final correction data 300, the central control device on the ground. A transmission signal generating device 200 that emits a transmission signal under the control of 300, and a transmission signal receiving device mounted on the vehicle 1 to receive a transmission signal and measure phase data for each reception antenna to generate correction data. It may include (100).

The correction data may be composed of intensity and phase values for each frequency and azimuth angle of a received signal obtained by receiving a transmission signal by the direction detection apparatus.

The central control device 300 may control the directional antenna controller 240 and the signal generator 210 of the transmission signal generating device 200 in order to radiate a transmission signal required for collecting correction data toward the vehicle 1. In addition, the central control device 300 receives navigation data (eg, longitude, latitude, altitude, roll, pitch) from the vehicle 1 in order to control the directional antenna 230 of the transmission signal generating device 200. can do. The central control device 300 transmits control data for collecting correction data to the transmission signal receiving device 100 mounted on the vehicle 1, and performs a function of receiving correction data from the vehicle 1, and the collected The correction data can be analyzed offline and post-processed to be used for direction detection to generate final correction data. The control data generated by the central control device 300 may be transmitted to the transmission signal generating device 200 through the aerial data link device 2.

Before performing the correction, the central control device 300 generates mathematical correction data in consideration of the antenna arrangement of the direction detection device, selects a frequency, azimuth, and elevation range for correction, and selects the selected frequency and azimuth. In consideration of the range of, and elevation, the posture and movement path required for the flight of the aircraft 1 can be determined. While the vehicle 1 is flying according to the determined posture and movement path, the correction system 10 may correct the direction detection device through a series of processes.

The transmission signal generator 200 includes a signal generator 210 that generates a transmission signal at a frequency required for correction according to the control data of the central control device 300 connected through a wired network, and a high-power amplifier 220 for amplifying the transmission signal to high power. ), a directional antenna controller 240 for radiating the amplified transmission signal toward the vehicle 1, and a directional antenna 230. In addition, the transmission signal generation apparatus 200 may include a GPS receiver 250 and a GPS reception antenna 260 to ensure synchronization of transmission/reception time between the signal generator 210 and the transmission signal reception apparatus 100.

The transmission signal receiving apparatus 100 mounted on the vehicle 1 may obtain a reception signal by receiving a transmission signal through a plurality of antennas mounted outside the vehicle 1. The transmission signal reception apparatus 100 may perform a function of measuring a value of a phase difference and signal strength between received signals required for generating correction data by using the received signal. For time synchronization with the signal generator 210 mounted on the transmission signal generation device 200, the transmission signal reception device 100 may receive GPS time information from the navigation device 3 of the aircraft 1. The correction data collected by the transmission signal receiving device 100 may be transmitted to the central control device 300 through the aerial data link device 2 together with the navigation data of the aircraft 1.

The transmission signal receiving device 100 uses an ADC (Analog to Digital Converter) to receive a radio frequency (RF) signal received from a plurality of antennas (antenna 1, antenna 2, ??antenna M) mounted on the aircraft 1 It can be converted into an IF (intermediate frequency) signal through digitizing and frequency downconversion. The transmission signal reception device 100 measures the intensity of signals received from a plurality of antennas and the value of the phase difference between multiple channels using the converted IF signal and stores it as correction data, and the aviation data link device ( It can be transmitted to the central control device 300 through 2).

The transmission signal receiving device 100 is supplied through the EGI (Embedded Global-Positioning-System Initial-Navigation-System) which is the navigation device 3 of the aircraft 1 in order to secure time synchronization with the central control device 300. It can operate by using 1-PPS (Pulse Per Second) signal of the navigation signal as a trigger signal.

The transmission signal receiving apparatus 100 may receive correction frequency list data including N frequency information from the central control apparatus 300. The correction frequency list data may be included in the control data. The transmission signal receiving device 100 may start the initial operation upon receiving a collection start command from the central control device 300, and then may repeatedly collect correction data by a 1-PPS trigger signal generated every second. . The transmission signal receiving apparatus 100 may measure the signal strength of the received signal and the phase difference between channels by sequentially tuning to N frequencies included in the previously received correction frequency list data. The transmission signal receiving apparatus 100 may repeatedly perform such an operation by a 1-PPS trigger signal that is repeatedly generated every second. The transmission signal receiving apparatus 100 may measure the phase and signal strength of a signal for 1/N second for one correction frequency and perform the same process N times per second by changing to the next frequency. Correction data collected through such a process includes signal collection frequency, signal strength, phase difference value between multiple channels, and navigation data (longitude, latitude, altitude, roll, pitch, yaw) of the vehicle 1 during the collected time. In preparation for disconnection of the wireless data link, it can be stored in the memory of the transmission signal receiving device 100 and transmitted to the central control device 300 in real time through the aviation data link device 2 of the aircraft 1 have. The transmission signal reception device 100 may finally stop collecting correction data according to a collection end command received from the central control device 300.

The transmission signal receiving apparatus 100 includes an FFT performing unit 130 that continuously performs Fast Fourier Transform (FFT) on the received signal as many as the number of frequencies of the corrected frequency list data based on the 1-PPS trigger signal, and a fast Fourier transform result. Based on the signal measurement unit 140 for continuously measuring the signal strength and phase for each receiving channel, the clock count value at the time when the FFT performing unit 130 performs the fast Fourier transform and the navigation device (3) of the aircraft (1) ), a navigation data generation unit 150 that generates time data using 1-PPS signal of the GPS signal obtained from) and generates navigation data using the attitude information of the aircraft 1 obtained from the navigation device 3, And a correction data generating unit 160 for generating correction data by combining the signal strength and phase information generated by the signal measuring unit 140 with the time data and the navigation data generated by the navigation data generating unit 150. have.

In addition, when the trigger signal synchronized using the 1-PPS signal is generated, the transmission signal receiving apparatus 100 down-converts the received signal continuously received through the antenna by the number of frequencies of the correction frequency list data to an intermediate frequency. It may include an A/D converter unit 120 converting the down-converted signal into a digital signal based on the 110 and 1-PPS trigger signals and transmitting the converted signals to the FFT performing unit 130.

The transmission signal generation device 200 may receive correction frequency list data including N frequencies and output signal strength information for each frequency from the central control device 300, and may start an initial operation by receiving a collection start command. The transmission signal generating apparatus 200 may emit a transmission signal for repetitive correction data collection by a 1-PPS trigger signal generated every second thereafter. The signal generator 210 may sequentially generate a transmission signal based on N frequency information and output signal strength information included in the previously received correction frequency list data, and the generated transmission signal passes through the high-power amplifier 220. It may be radiated through the directional antenna 230. The transmission signal generating apparatus 200 may repeatedly perform such an operation by a 1-PPS trigger signal that is repeatedly generated every second. The transmission signal generation apparatus 200 may generate a transmission signal for one correction frequency, and automatically change the frequency in a period of 1/N seconds to repeatedly generate N frequency signals per second. The central control device 300 transmits the navigation data included in the correction data received in real time so that the transmission signal generation device 200 radiates the transmission signal toward the actual flying vehicle 1. ) Can be transmitted to the directional antenna controller 240. The transmission signal generation device 200 may finally stop generating the transmission signal according to the collection end command received from the central control device 300.

The transmission signal generator 200 includes a signal generator 210 that generates a transmission signal of a frequency selected for correction, a high-power amplifier 220 that amplifies the transmission signal to high power, and directs the amplified transmission signal in a specific direction and radiates it. The directional antenna 230 may include a directional antenna controller 240 for controlling the direction of radiation of the directional antenna 230 toward the vehicle 1.

The transmission signal generation device 200 receives a GPS signal and converts the 1-PPS signal of the GPS signal as a trigger signal in order to secure time synchronization with the transmission signal reception device 100 that is mounted on the aircraft 1 and collects correction data. A GPS receiving antenna 260 and a GPS receiver 250 for supplying to the signal generator 210 may be further included.

The central control unit 300 is a terrestrial data link device 310 that transmits control data to the transmission signal reception device 100 and receives correction data transmitted from the transmission signal reception device 100 through the aerial data link device 2. ) And a ground operation processor 320 for controlling the transmission signal receiving apparatus 100 and the transmission signal generating apparatus 200 and post-processing the correction data. The ground operation processor 320 may transmit the navigation data to the directional antenna controller 240 of the transmission signal generator 200 and generate the corrected frequency list data.

The central control device 300 generates correction frequency list data including information on the N frequencies selected to perform the correction and information on the intensity of the transmission signal, and sends the data to the transmission signal receiving device 100 and the transmission signal generating device 200. Can be transmitted. The central control device 300 may transmit a correction data collection start command and a collection end command to the transmission signal reception device 100 and the transmission signal generation device 200, and the transmission signal reception device 100 synchronized in time by the GPS signal. ) And the transmission signal generation apparatus 200 may continuously perform emission of transmission signals and collection of correction data for N frequencies based on the previously received frequency list data.

The central control device 300 receives correction data including navigation data from the transmission signal reception device 100 through the ground data link device 310, and receives in real time so that it can be used for control of the directional antenna 230 The navigation data of the corrected correction data may be transmitted to the transmission signal generating apparatus 200.

The quality of the correction data received from the transmission signal receiving apparatus 100 may vary according to the posture of the aircraft 1 at the time of collection. The central control device 300 may obtain effective correction data by performing filtering on the correction data using the attitude information and distance information of the vehicle 1 at the time the correction data is collected. The central control device 300 may measure the accuracy of direction detection by performing a simulation using effective correction data.

The correction system 10 may generate a correction data set by repeatedly performing a process of obtaining valid correction data in order to secure the reliability of the effective correction data. The central control device 300 may generate final correction data by accumulating the correction data set.

The central control device 300 may measure the accuracy of direction detection by performing a direction detection simulation using the final correction data. In addition, the central control device 300 may optimize a baseline combination for each frequency. The central control device 300 may measure the accuracy of direction detection with respect to the direction detection device provided with the optimized baseline combination and final correction data.

The ground operation processor 320 includes a data analysis processing unit that compares and analyzes the existing correction data and the collected correction data, a list generation unit that generates correction frequency list data including a frequency identified as needing correction and a strength of a transmission signal, A transmission device control unit that controls the control of the transmission signal generation device 200 to perform correction, and generates a channel correction command of the transmission signal reception device 100 to collect a stable phase value when performing the correction, and the generated channel correction data A channel correction control unit that receives and checks and displays the validity of the channel correction data, a receiving device control unit that controls the control of the transmission signal receiving device 100 to perform correction, and a storage unit that stores correction data obtained through correction. , A display unit that displays correction data, a data post-processing unit that performs filtering for stable correction data acquisition in consideration of the attitude information, distance information, and signal reception level of the vehicle 1 at the time of collecting the correction data, and post-processing A direction detection accuracy calculation unit that performs a simulation that calculates the accuracy of direction detection using the corrected data, a final correction data calculation unit that calculates valid final correction data by accumulating data using a repetitively collected correction data set, And a baseline selector for analyzing an accuracy result of direction detection through simulation and optimizing a frequency-based baseline combination of the direction detection algorithm in order to improve performance.

The transmission signal reception apparatus 100, the transmission signal generation apparatus 200, and the central control apparatus 300 may each include a processor. The processor may be implemented as an array of a plurality of logic gates, and may be implemented as a combination of a general-purpose microprocessor and a memory in which a program executable in the microprocessor is stored.

In addition, the transmission signal reception device 100, the transmission signal generation device 200, and the central control device 300 each include a random access memory (RAM) such as dynamic random access memory (DRAM) and static random access memory (SRAM), Includes read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD-ROM, Blu-ray or other optical disk storage, hard disk drive (HDD), solid state drive (SSD), or flash memory can do.

5 is a diagram illustrating an example of a user operation program.

The central control device 300 may include a user operating program, and the user may manipulate the user operating program so that the central control device 300 can simulate the accuracy of direction detection. In addition, the user may manipulate a user operation program so that the central control device 300 may post-process the correction data.

6 is a diagram for describing an example of a correction method.

In step 610, the apparatus for generating a transmission signal may generate a transmission signal and emit a transmission signal toward an aircraft equipped with a direction detection device.

In step 620, the apparatus for receiving a transmission signal may obtain a received signal by receiving a transmission signal, and may generate correction data using the received signal.

In step 630, the central control device may generate final correction data by processing the correction data.

7 is a diagram for describing an example of a correction method.

In step 710, the central control device may mathematically generate correction data in consideration of the antenna arrangement of the direction detection device and analyze the generated correction data.

In step 720, the central control device may select a range of a frequency, azimuth angle, and elevation angle to be corrected based on the analyzed correction data.

In step 730, the central control device may set the attitude and movement path of the aircraft based on the selected frequency, azimuth angle, and elevation range.

In step 740, the aircraft flies along the set posture and movement path, the transmission signal generating device radiates a transmission signal toward the flying vehicle, and the transmission signal receiving device receives the transmission signal and receives correction data from the received signal. Generated, and the central control device may receive the correction data generated from the transmission signal receiving device.

In step 750, the central control device may generate effective correction data by performing post-processing such as filtering on the correction data in consideration of the attitude information of the aircraft and the reception level of the antenna.

In step 760, the central control device may calculate the azimuth angle of the effective correction data and calculate the accuracy of direction detection by considering the coordinates of the longitude and latitude in which the vehicle and the correction system are located. The central control device may calculate the accuracy of the direction detection of the direction detection device by using the azimuth angle calculated from the effective correction data.

Steps 740 to 760 may be performed a plurality of times. As steps 740 to 760 are performed a plurality of times, a correction data set, which is a set of effective correction data, may be obtained.

In step 770, the central control device may generate final correction data by performing steps 740 to 760 a plurality of times and accumulating the obtained correction data set. For example, the central control device may generate final correction data by accumulating valid correction data whose accuracy of direction detection is greater than or equal to a reference value in the correction data set. For example, the central control device may generate final correction data using an average value of valid correction data obtained by accumulating the correction data set.

In step 780, the central control device may calculate the accuracy of direction detection by using the final correction data, and optimize a baseline combination for each frequency.

In step 790, the central control device may calculate the accuracy of direction detection for the direction detection device provided with the final correction data and the optimized baseline combination. For example, the central control device may calculate the accuracy of the direction detection of the direction detection device by using the azimuth angle calculated from the final correction data.

Although the embodiments have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. Belongs to.

1: Vehicle 2: Aviation data link device
3: navigation system 10: correction system
100: transmission signal receiving device 110: frequency conversion unit
120: A/D converter unit 130: FFT performing unit
140: signal measurement unit 150: navigation data generation unit
160: correction data generation unit 200: transmission signal generation device
210: signal generator 220: high power amplifier
230: directional antenna 240: directional antenna controller
250: GPS receiver 260: GPS receiving antenna
300: central control unit 310: ground data link unit
320: ground operation processor

Claims (10)

In the correction system for a direction finding device,
A transmission signal generating device disposed on the ground, mounting the direction detection device, and emitting a transmission signal toward an in-flight vehicle;
A transmission signal reception device mounted on the aircraft and generating correction data using a reception signal obtained by receiving the transmission signal from the transmission signal generation device; And
A central control unit disposed on the ground, controlling the transmission signal generating device to generate the transmission signal, and processing the correction data received from the transmission signal receiving device to generate final correction data,
The central control device includes a ground operation processor,
The ground operation processor,
A collection list generator for generating collection frequency list data including a frequency for performing correction and a strength of the transmission signal;
A data post-processing unit configured to filter the correction data to generate effective correction data;
A direction detection accuracy calculator configured to calculate an accuracy of the direction detection of the direction detection device by using the effective correction data; And
A final correction data calculation unit generating a correction data set by repeatedly obtaining the effective correction data, and generating final correction data by accumulating the correction data set,
The transmission signal is a signal generated to have a frequency and the intensity for performing the correction of the collected frequency list data,
The correction data is composed of intensity and phase values for each frequency and azimuth angle of the received signal,
The central control device further comprises a ground data link device configured to receive the correction data transmitted through the aerial data link device of the vehicle. The method of claim 1,
The transmission signal generating device,
A GPS antenna for receiving a GPS signal; And
And a GPS receiver that obtains a 1-PPS signal from the GPS signal. The method of claim 2,
The transmission signal generating device,
A signal generator for generating the transmission signal;
A high-power amplifier for amplifying the generated transmission signal to high power;
A directional antenna radiating the amplified transmission signal; And
A correction system comprising a directional antenna controller for controlling the attitude of the directional antenna so that the directional antenna radiates the amplified transmission signal toward the vehicle based on the navigation data of the vehicle received from the central control device. . The method of claim 3,
The signal generator generates the transmission signal of the number of frequencies included in the collected frequency list data received from the central control device every second by using the 1-PPS signal as a trigger. The method of claim 1,
The transmission signal receiving device,
Perform FFT to perform Fast Fourier Transform (FFT) every second of the received signal of the number of frequencies included in the collected frequency list data received from the central control device by using the 1-PPS signal obtained from the navigation device of the aircraft as a trigger part;
A signal measuring unit configured to measure the phase and intensity of each reception channel of the fast Fourier transformed reception signal by the number of frequencies by using the 1-PPS signal as a trigger;
A navigation method in which time data is generated by using the 1-PPS signal and a clock count value at the time when the FFT performing unit performs a fast Fourier transform, and navigation data is generated by using the attitude information of the aircraft obtained from the navigation device. A data generation unit; And
And a correction data generator for generating correction data using the time data and the navigation data. The method of claim 1,
The transmission signal generating device and the transmission signal receiving device are synchronized with each other based on the 1-PPS signal of the GPS signal each obtained. In the correction method performed by a correction system including a transmission signal generator, a transmission signal reception device, and a central control device to improve the accuracy of direction detection of a direction detection device mounted on an aircraft,
(a) the transmitting signal generating device radiating a transmission signal toward the vehicle flying along a predetermined posture and movement path;
(b) generating, by the transmission signal receiving apparatus, correction data using a received signal obtained by receiving the transmission signal;
(c) generating, by the central control device, effective correction data by receiving and filtering the correction data from the transmission signal receiving device;
(d) calculating, by the central control device, an accuracy of direction detection by using the valid correction data;
(e) obtaining a correction data set, which is a set of effective correction data, by repeatedly performing steps (a) to (d);
(f) generating, by the central control device, final correction data by accumulating the correction data set;
(g) calculating, by the central control device, accuracy of direction detection using the final correction data, and optimizing a baseline combination for each frequency; And
(h) calculating, by the central control device, an accuracy of direction detection for the direction detection device provided with the final correction data and the optimized baseline combination,
The transmission signal is a signal generated to have a frequency and intensity for performing correction,
The correction data is composed of intensity and phase values for each frequency and azimuth angle of the received signal. The method of claim 7,
The preset posture and the movement path are set from a range of an azimuth angle and an elevation angle selected based on mathematically pre-calculated correction data. delete delete

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