CN111123219A - Ultra-wideband dense interference signal generation system and method based on optical wavelength division multiplexing - Google Patents
Ultra-wideband dense interference signal generation system and method based on optical wavelength division multiplexing Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention discloses an ultra-wideband dense interference signal generation system and method based on optical wavelength division multiplexing, wherein the system comprises a multi-wavelength laser, an optical wavelength division multiplexer I, an electro-optical converter, an optical switch I, a 2:2 optical coupler, an optical switch II and an electro-optical converter which are sequentially connected, and a dense interference signal formed by sequentially connecting the 2:2 optical coupler, the optical wavelength decomposition multiplexer, a multi-path parallel variable optical fiber delay line, the optical wavelength division multiplexer II and the 2:2 optical coupler forms a loop. The invention can generate ultra wide band dense false target interference signals without complex microwave frequency conversion, and the ultra wide band analog transmission characteristic of the microwave photon technology can realize high fidelity storage and output of the pre-interference radar signals.
Description
Technical Field
The invention belongs to the field of radar electronic countermeasure, and particularly relates to an ultra-wideband dense interference signal generation system and method based on optical wavelength division multiplexing.
Background
The essence of Electronic Warfare (EW) is the struggle between the enemy and my parties to compete against the rights of electromagnetic information. In recent years, due to the development of modern new-system radars and radar anti-interference technologies, a single and fixed interference form is difficult to cope with the changed anti-interference measures taken by the other party, so that new breakthroughs in interference strategies, interference modes and interference signal patterns are needed to adapt to the development of the radar anti-interference technologies.
The radar jammer based on radio frequency storage can accurately copy radar waveforms, can output radio frequency oscillation with the same (or similar) frequency as the radar, and can achieve the effect of implementing optimal interference on the radar in multi-dimensional information domains such as time, space, frequency, modulation patterns and the like by adopting a deception/covering composite modulation mode. The rf storage component is a component that can store the input rf signal and reconstruct the output if necessary. In the electronic countermeasure system, there are many techniques for realizing radio frequency memory, and there are known a microwave, acoustic wave, and optical wave delay line, an analog frequency memory loop including the above delay line, and a Digital Radio Frequency Memory (DRFM) unit including an analog-to-digital converter (ADC), a digital memory, and a digital-to-analog converter (DAC). Due to the flexibility of digital processing, the current mainstream radio frequency is stored as a DRFM, but is limited by the level of electronic components, and the bandwidth of the DRFM is limited, so that the countermeasure requirement on the ultra-wideband radar is difficult to meet. In addition, in order to realize high-fidelity waveform copying, the DRFM must use an ADC chip with high bits, and when an interference pattern such as a dense decoy is performed, the amount of data to be processed is very large, which results in high cost and complexity of the system itself.
Disclosure of Invention
The invention aims to provide an ultra wide band dense interference signal generation method based on optical wavelength division multiplexing.
The technical scheme for realizing the purpose of the invention is as follows: an ultra-wideband dense interference signal generation system based on optical wavelength division multiplexing comprises a multi-wavelength laser, an optical wavelength division multiplexer I, an electro-optical converter, an optical switch I, a 2:2 optical coupler, an optical switch II and an optoelectronic converter which are sequentially connected, and a dense interference signal forming loop formed by sequentially connecting the 2:2 optical coupler, the optical wavelength decomposition multiplexer, a multi-path parallel variable optical fiber delay line, the optical wavelength division multiplexer II and the 2:2 optical coupler.
Preferably, the multi-path parallel variable optical fiber delay line comprises 1 × n optical switches, n sections of optical fiber delay lines with different lengths and n × 1 optical switches which are connected in sequence; the optical signal firstly selects different delay paths through the 1 x n optical switch, then completes the delay of the signal through the corresponding delay line, and finally completes the signal combination output through the n x 1 switch.
Preferably, an optical power compensator is connected between the 2:2 optical coupler and the optical wave decomposition multiplexer, and an optical fiber acousto-optic frequency shifter is connected between the second optical coupler and the 2:2 optical coupler of the optical wave division multiplexer.
A method for generating an ultra-wideband dense interference signal based on optical wavelength division multiplexing comprises the following specific steps:
the multi-wavelength laser forms n optical carriers with different wavelengths through the first optical wavelength division multiplexer and transmits the optical carriers to the electro-optical converter, radar signals to be interfered are loaded on the optical carriers through the electro-optical converter to form radar optical signals, the radar optical signals are gated through the first optical switch and are divided into two paths by the 2:2 coupler, one path of radar optical signals is directly output through the second optical switch and the photoelectric converter, the other path of radar optical signals enters the dense interference signal forming loop to be subjected to cyclic delay to obtain dense interference signals, and the dense interference signals are output through the second optical switch and the photoelectric converter.
Preferably, the specific method for obtaining the dense interference signal after the other path enters the dense interference signal forming loop and is subjected to cyclic delay is as follows:
the radar optical signal compensates the lost optical power through the optical power compensator, the optical signals with n different wavelengths are separated through the optical wave decomposition multiplexer, the optical signals with n different wavelengths are delayed according to the time sequence requirement of the interference signal through the multi-path parallel variable optical fiber delay line, the delayed optical signals with n different wavelengths are combined into one path through the optical wavelength division multiplexer, the frequency of the optical signal is shifted through the optical fiber acousto-optic frequency shifter, the delayed radar optical signal is divided into two paths through the 2:2 optical coupler, one path is output through the optical switch II and the photoelectric converter, and the other path continuously enters the optical power compensator for circulation.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the invention introduces the optical wavelength division multiplexer, through the parallel transmission of a plurality of optical carriers, realize the multi-target confrontation at the same time, and the apparatus is simple;
(2) the variable optical fiber delay line is adopted, so that the countermeasure requirements of radars with different pulse widths are met;
(3) the invention adopts the multi-tap delay technology, and can obtain dense interference signals.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
Fig. 1 is a schematic diagram of an ultra-wideband dense interference signal generation system based on optical wavelength division multiplexing.
Fig. 2 is a schematic diagram of one of the multiple parallel variable optical fiber delay lines.
Fig. 3 is a schematic diagram of signal generation.
Detailed Description
An ultra-wideband dense interference signal generation system based on optical wavelength division multiplexing comprises a multi-wavelength laser 1, an optical wavelength division multiplexer I2, an electro-optical converter 3, an optical switch I4, a 2:2 optical coupler 5, an optical switch II 11, an electro-optical converter 12 and a dense interference signal formed by sequentially connecting the 2:2 optical coupler 5, an optical power compensator 6, an optical wavelength decomposition multiplexer 7, a multi-path parallel variable optical fiber delay line 8, an optical wavelength division multiplexer II 9, an optical fiber acousto-optical frequency shifter 10 and the 2:2 optical coupler 5 to form a loop.
The multi-wavelength laser 1 forms n optical carriers with different wavelengths through an optical wavelength division multiplexer I2 and transmits the optical carriers to an electro-optical converter 3, radar signals to be interfered are loaded on the optical carriers through the electro-optical converter 3 to form radar optical signals, the radar optical signals are gated through a 2:2 coupler 5 through an optical switch I4, the radar optical signals are divided into two paths, one path is directly output through an optical switch II 11 and an optical-to-electrical converter 12, and the other path enters dense interference signals to form a loop.
In a dense interference signal forming loop, an optical power compensator 6 compensates optical power lost in the loop, an optical wave decomposition multiplexer 7 separates n optical signals with different wavelengths in a single-mode optical fiber, a multi-path parallel variable optical fiber delay line 8 delays the n optical signals with different wavelengths according to the time sequence requirement of the interference signal, the delayed n optical signals with different wavelengths are combined into one path by an optical wavelength division multiplexer II 9, an optical fiber acousto-optic frequency shifter 10 moves the frequency of the optical signal circulating each time through the loop to avoid noise self-oscillation, 2:2 an optical coupler 5 divides the delayed radar optical signal into two paths, one path is output through an optical switch II 11 and an optical-to-electrical converter 12, and the other path continues to enter the optical power compensator 6 for circulation;
after the optical signal reaches the preset delay time after being circulated for multiple times in the dense interference signal forming loop, acquiring a dense interference signal; when the cycle reaches the preset delay time, the second optical switch 11 is gated, the dense interference signal enters the photoelectric converter 12 from the second optical switch 11 through the 2:2 coupler 5, and the photoelectric converter 12 converts the dense interference signal in the form of the optical signal into a radio frequency signal and outputs the radio frequency signal. The optical switch II 11 controls the output of optical signals meeting the time sequence requirement, and after passing through the photoelectric converter 12, broadband dense interference signals meeting the requirement of radar countermeasure are obtained. The signal is coherent with the radar, and very good receiving gain can be obtained at a radar receiver, so that effective interference countermeasure is realized. A schematic diagram of the generation of the interference signal is shown in fig. 3.
The invention compensates the loss of the loop optical power through the optical power compensator 6 to obtain a longer frequency storage time.
Coherent noise exists in a loop, self-oscillation occurs after the coherent noise of light circulates for many times through compensation of an optical power compensator, a noise signal related to the length of the loop is generated, the signal to noise ratio is deteriorated, in order to avoid deterioration of the signal to noise ratio, the acousto-optic frequency shifter 10 is introduced into the loop, and the frequency of all optical carriers including the noise is moved after each loop circulation, so that the formation of the noise self-oscillation is avoided.
In order to obtain dense decoys of different time sequences, the multipath parallel variable optical fiber delay line 8 in the loop consists of multi-stage switches and can be controlled by the switches. One of the multiple parallel variable optical fiber delay lines 8 is shown in fig. 2. The multi-path parallel variable optical fiber delay line 8 comprises 1 × n optical switches 13, n sections of optical fiber delay lines 14 with different lengths and n × 1 optical switches 15. The input optical signal firstly selects different delay paths through the 1 x n optical switch 13, then completes the delay of the signal through the corresponding delay line 14, and then completes the signal combining output through the n x 1 switch.
The invention firstly loads the pre-interference radar signal on the light through electro-optical transformation, forms the dense interference signal after being processed by the optical wavelength division multiplexing and multi-tap time delay technology, and finally controls the output of the optical signal meeting the interference time sequence requirement through the optical switch. The invention utilizes the optical wavelength division multiplexer to generate dense interference signals; dense interference signal generation is obtained by adopting a multi-tap delay technology; and the variable optical fiber delay line is adopted, so that the countermeasure requirements of radars with different pulse widths are met. The invention realizes the generation of dense interference signals with long storage time of the ultra-wideband.
The invention can generate ultra wide band dense false target interference signals without complex microwave frequency conversion, and the ultra wide band analog transmission characteristic of the microwave photon technology can realize high fidelity storage and output of the pre-interference radar signals, thereby obtaining effective electronic interference to the radar.
Claims (5)
1. An ultra-wideband dense interference signal generation system based on optical wavelength division multiplexing is characterized by comprising a multi-wavelength laser (1), an optical wavelength division multiplexer I (2), an electro-optical converter (3), an optical switch I (4), a 2:2 optical coupler (5), an optical switch II (11), an optical-to-electrical converter (12) which are sequentially connected, and a dense interference signal formed by sequentially connecting the 2:2 optical coupler (5), an optical wavelength decomposition multiplexer (7), a multi-path parallel variable optical fiber delay line (8), the optical wavelength division multiplexer II (9) and the 2:2 optical coupler (5) to form a loop.
2. The ultra-wideband dense interference signal generation system based on optical wavelength division multiplexing according to claim 1, wherein the multiple parallel variable optical fiber delay lines (8) comprise sequentially connected 1 x n optical switches (12), n segments of optical fiber delay lines (13) with different lengths, and n x 1 optical switches (14); the optical signal firstly selects different delay paths through a 1 x n optical switch (13), then completes the delay of the signal through a corresponding delay line (13), and finally completes the signal combination output through the n x 1 switch.
3. The system for generating ultra-wideband dense interference signals based on optical wavelength division multiplexing according to claim 1, wherein an optical power compensator (6) is connected between the 2:2 optical coupler (5) and the optical wavelength division multiplexer (7), and an optical fiber acousto-optic frequency shifter (10) is connected between the two optical wavelength division multiplexers (9) and the 2:2 optical coupler (5).
4. A method based on the system of any one of claims 1 to 3, characterized by comprising the following specific steps:
the multi-wavelength laser (1) forms n optical carriers with different wavelengths through an optical wavelength division multiplexer I (2) and transmits the optical carriers to an electro-optical converter (3), a radar signal to be interfered is loaded on the optical carriers through the electro-optical converter (3) to form a radar optical signal, the radar optical signal is gated through an optical switch I (4) and is divided into two paths through a 2:2 coupler (5), one path is directly output through an optical switch II (11) and an optical-to-electrical converter (12), the other path enters an intensive interference signal to form a loop to be subjected to cyclic delay to obtain an intensive interference signal, and the intensive interference signal is output through the optical switch II (11) and the optical-to-electrical converter (12).
5. The method for generating the ultra-wideband dense interference signal based on the optical wavelength division multiplexing according to claim 4, wherein the specific method for obtaining the dense interference signal after the other path enters the dense interference signal forming loop for cyclic delay comprises the following steps:
the radar optical signal compensates the lost optical power through an optical power compensator (6), n optical signals with different wavelengths are separated through an optical wave decomposition multiplexer (7), the n optical signals with different wavelengths are delayed according to the time sequence requirement of an interference signal through a multi-path parallel variable optical fiber delay line (8), the n delayed optical signals with different wavelengths are combined into one path through an optical wavelength division multiplexer II (9), the frequency of the optical signal is shifted through an optical fiber acousto-optic frequency shifter (10), the delayed radar optical signal is divided into two paths through a 2:2 optical coupler (5), one path is output through an optical switch II (11) and a photoelectric converter (12), and the other path continues to enter the optical power compensator (6) for circulation.
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Cited By (3)
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| CN112398537A (en) * | 2020-12-14 | 2021-02-23 | 中国电子科技集团公司第三十八研究所 | M-bit optical delayer |
| CN112461764A (en) * | 2020-11-17 | 2021-03-09 | 上海科技大学 | All-in-one data acquisition method based on programmable acoustic delay line |
| CN114567383A (en) * | 2022-02-15 | 2022-05-31 | 上海交通大学 | Silicon-based integrated photonic millimeter wave and terahertz transmission system |
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| CN104698542A (en) * | 2014-12-16 | 2015-06-10 | 中国科学院上海光学精密机械研究所 | Microwave optical fiber delay line |
| CN107124229A (en) * | 2017-03-25 | 2017-09-01 | 西安电子科技大学 | A kind of any time-delay mechanism of radiofrequency signal and method that frequency displacement is circulated based on microwave photon |
| CN109274453A (en) * | 2018-09-26 | 2019-01-25 | 中国电子科技集团公司第三十八研究所 | A kind of multiple wavelength optical signal delay process network |
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Patent Citations (4)
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| CN103941235A (en) * | 2014-02-26 | 2014-07-23 | 上海交通大学 | Full-optical-control phased-array radar transmitter |
| CN104698542A (en) * | 2014-12-16 | 2015-06-10 | 中国科学院上海光学精密机械研究所 | Microwave optical fiber delay line |
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| CN114567383A (en) * | 2022-02-15 | 2022-05-31 | 上海交通大学 | Silicon-based integrated photonic millimeter wave and terahertz transmission system |
| CN114567383B (en) * | 2022-02-15 | 2023-03-28 | 上海交通大学 | Silicon-based integrated photonic millimeter wave and terahertz transmission system |
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