JP2018004538A - Radio guidance device and radio guidance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a radio guidance device to perform an approach detecting function by widening the angle of a transmission/reception beam without transmission blind in an approach distance in addition to detecting and tracking function.SOLUTION: The radio guidance device has: a detecting and tracking mode for detecting and tracking a target by applying and controlling a pattern of an antenna beam by a phased array; and an approach detecting mode for detecting an approach distance with a target. An antenna beams as a pencil beam is used in both transmission and reception in the detecting and tracking mode and a transmission by one element which is aligned on the same surface with the phased array is performed in the approach detection mode so as to form a transmission fan beam whose angle is greater than that of the pencil beam and form a plurality of reception beams in a coverage area of the transmission fan beam by DBF.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a radio wave induction device and a radio wave induction method.

  Conventional guided vehicles are equipped with a proximity fuze that detects the proximity of a radio wave seeker that detects and tracks a target and outputs a proximity initiation signal. The radio wave seeker is attached to the head of the traveling direction of the flying object, and mainly measures the direction of the target and guides and controls the flying object in that direction. Also, the proximity fuze is attached to the center of the fuselage, and detects the proximity distance to the target to detonate the flying object. In other words, when the flying object does not hit directly, there is no target in the traveling direction of the flying object, so the proximity of the flying object to the target is detected and detonated, and FMCW (Frequency Modulated) that uses only distance information. The Continues Wave method is common.

  By the way, in recent years, a sensor (hereinafter referred to as a radio wave induction device) having both a detection / tracking function as a radio wave seeker and a proximity detection function as a proximity fuze is required from the viewpoint of space saving in mounting on a flying object. Yes. The reason why this was not possible in the past is that the radio wave seeker has a transmission blind and cannot receive radio waves at close distances, the radio wave seeker mounting position is different from the proximity fuze mounting position, and the proximity is detected. To this end, it is necessary to make the field of view of the radio wave seeker wide.

DBF (Digital Beam Forming), Yoshida, "Revised Radar Technology", IEICE, pp.289-291 (1996) Angle measurement method (monopulse), Yoshida, revised radar technology ', IEICE, pp.260-264 (1996) Synthetic bandwidth processing, Donald R. Wehner, “High Resolution Radar”, Artech House, pp157-pp167

  As described above, in the conventional guided flying object, the radio wave seeker and the proximity fuze are separately provided, which is a problem of space saving in mounting.

  The present embodiment has been made in view of the above problems, and in addition to a detection / tracking function, there is no transmission blind at a close distance, and a radio wave induction device capable of realizing a proximity detection function by widening a transmitted / received beam and An object is to provide a radio wave guidance method.

  According to the radio wave guiding device according to the embodiment, the antenna beam pattern by the phased array is adaptively controlled, and the detection / tracking mode for detecting and tracking the target and the proximity detection mode for detecting the proximity distance to the target are set. In the detection / tracking mode, the antenna beam is used as a pencil beam for both transmission and reception. In the proximity detection mode, transmission is performed by one element arranged on the same plane as the phased array, and a transmission fan beam having a wider angle than the pencil beam is transmitted. And a plurality of reception beams are formed in the coverage area of the transmission fan beam by DBF.

The conceptual diagram which shows the mode of each beam formation of the detection / tracking mode of the electromagnetic wave guidance apparatus which concerns on embodiment, and proximity detection mode. The block diagram which shows the structure of the electromagnetic wave guidance apparatus which concerns on 1st Embodiment. The block diagram which shows the structure of the transmission / reception module of the electromagnetic wave guidance apparatus which concerns on 1st Embodiment. The block diagram which shows the structure of the analog electric power feeding circuit of the electromagnetic wave guidance apparatus which concerns on 1st Embodiment. The figure which shows the antenna element arrangement | sequence and switch switch timing at the time of proximity | contact detection mode of the electromagnetic wave guidance apparatus which concerns on 1st Embodiment. The figure which shows the outline | summary of the synthetic | combination zone | band process of the electromagnetic wave guidance apparatus which concerns on 1st Embodiment, transmission frequency, and received data rearrangement. It is a block diagram which shows the structure of the electromagnetic wave guidance apparatus which concerns on 2nd Embodiment. The figure which shows the antenna element arrangement | sequence and switch switch timing at the time of the detection and tracking mode of the electromagnetic wave guidance apparatus which concern on 2nd Embodiment. The figure for demonstrating the relationship between the antenna element arrangement | sequence of the electromagnetic wave guidance apparatus which concerns on 3rd Embodiment, and a virtual array. The block diagram which shows the structure of the electromagnetic wave guidance apparatus which concerns on 3rd Embodiment. The figure which shows the antenna element arrangement | sequence and switch switch timing at the time of the detection and tracking mode of the electromagnetic wave guidance apparatus which concern on 3rd Embodiment. The figure which shows the antenna element arrangement | sequence and switch switch timing at the time of proximity | contact detection mode of the electromagnetic wave guidance apparatus which concerns on 3rd Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
The radio wave guidance device according to the first embodiment has a detection / tracking mode and a proximity detection mode. FIGS. 1A and 1B show beam forming states in the detection / tracking mode and the proximity detection mode, respectively. That is, in the detection / tracking mode, the transmission beam and the reception beam are both made into a pencil beam and transmitted from the head of the flying object toward the traveling direction to capture / track a target existing in the traveling direction. In the proximity detection mode, the transmission beam is formed with a fan beam and the reception beam is formed with a multi-beam, and the reception multi-beam is formed over a wide area in the coverage area of the transmission fan beam to accurately capture a target that is close to and deviating from the traveling direction It is possible.

  FIG. 2 is a block diagram illustrating a configuration of the radio wave guidance device according to the first embodiment. As shown in FIG. 2, the radio wave guiding apparatus includes an antenna unit 11, a transmission system 12, a reception system 13, a signal processing unit (CPU or GPU) 14, and a control system 15, and includes the detection / tracking mode, proximity detection, and the like. It has a mode.

  The antenna unit 11 includes N × M element antennas 11111 to 111NM constituting a phased array, transmission / reception modules 11211 to 112NM for each element antenna, and a proximity transmission element 113. The proximity transmitting element 113 is one element formed on the same arrangement surface as the phased array, and any one of the element antennas 111i (i is 11 to NM) may be shared. As shown in FIG. 3, the transmission / reception module 112i for the element antenna 111i includes a transmission phase shifter A1 that controls the phase of the transmission signal in accordance with beam formation, a transmission amplifier A2 that amplifies the power of the transmission signal, and the element antenna 111i. A circulator A3 that sends a transmission signal to the antenna antenna 111i and extracts the reception signal of the element antenna 111i, a reception amplifier A4 that amplifies the reception signal with low noise, and a reception phase shifter A5 that controls the phase of the reception signal in accordance with the beam formation, Is provided.

  The transmission system 12 includes a D / A converter 121, a transmitter 122, a proximity transmission switch 123, and an analog distributor 124.

  In the transmission system 12, in the detection / tracking mode, the transmission signal in the IF (intermediate wave frequency) band output from the D / A converter 111 is converted into the transmission signal in the RF (transmission frequency) band by the transmitter 112 and analog. The distributor 124 feeds power to the transmission / reception module 112 i of the antenna unit 11, forms a transmission pencil beam in an arbitrary direction by the phase control of the transmission phase shifter A 1 in each transmission / reception module 112 i, and outputs a transmission wave.

  In the transmission system 12, in the proximity detection mode, the proximity transmission switch 123 sends a transmission signal to the proximity transmission element 113 that does not pass through the transmission / reception module of the antenna unit 11, and radiates a radio wave from the element by a fan beam. In addition, the frequency of the transmission signal output from the D / A converter 121 is stepped for each time-division DBF beam formation to widen the bandwidth with multipulses.

  The receiving system 13 includes a switch element 13111 to 131NM, an analog power feeding circuit (calculating a sum / azimuth difference / elevation angle difference) 132, a DBF (Digital Beam Forming) switch 133, a sum / element, an azimuth difference, and an elevation difference. Are provided with receivers 1341 to 1343 and A / D converters 1351 to 1353.

  In the reception system 13, in the detection / tracking mode, the element switch 131 i is switched to the analog power feeding circuit 132 side, and the reception signal output from the transmission / reception module 112 i is sent to the analog power feeding circuit 132. The analog power feeding circuit 132 generates a sum signal (sum beam) of each element output, an azimuth difference signal, and an elevation difference signal (difference beam). The sum signal is sent to the receiver 1341 via the DBF switch 133, and the azimuth difference signal and the elevation difference signal are sent to the receivers 1342 and 1343, respectively, and frequency-converted to IF bands, respectively, and then the A / D converter 1351. To 1353 to be converted into a digital signal and sent to the signal processing unit 14. In this case, beam forming is performed by the analog power feeding circuit 132.

  As shown in FIG. 4, the analog power feeding circuit 132 divides vertical M elements × horizontal N elements into openings A to D, and inputs each element to M × 2 horizontal N / 2 synthesis circuits 1321i, 1322i and 4 The vertical M / 2 synthesizing circuits 13231 to 13234 are sent to the rat race circuit 1324 as the aperture synthesis signals A, B, C, and D, and the rat race circuit 1324 uses the sum signal from the aperture synthesis signals A, B, C, and D. (A + B + C + D), an elevation difference signal (A + B) − (C + D), and an azimuth difference signal (A + C) − (B + D) are generated.

  In the reception system 13, in the proximity detection mode, the element switch 131 i is switched to the DBF switch 133 side, and a reception signal output from the transmission / reception module 112 i is sent to the DBF switch 133. The DBF switch 133 sequentially switches and outputs element signals 1, 2,..., K (K = N × M). The sequentially switched element signals are sent to the signal processing unit 14 via the receiver 1341 and the A / D converter 1351.

  The signal processing unit 14 performs I / Q detection on the sum signal, the azimuth difference signal, the elevation difference signal, and the element signal sequence in the proximity detection mode obtained by the receiving system 13 in the detection / tracking mode, and detects the detected signal. And a plurality of antenna patterns are calculated from the stored signals. Then, an instruction for activation / search / tracking / proximity detection is sent to the control system 15 based on each pattern calculation result.

  The control system 15 includes a timing generation circuit 151, a switch control circuit 152, and a transfer control circuit 153. The timing generation circuit 151 activates the antenna unit 11, the transmission system 12, and the reception system 13 in accordance with the activation / search / tracking / proximity detection instruction from the signal processing unit 14, and generates timing signals corresponding to the processing operation in each mode. The data is sent to the antenna unit 11, the transmission system 12, the reception system 13, and further to the switch control circuit 152 and the transfer control circuit 153. The switch control circuit 152 switches and controls the proximity / transmission switch 123 of the transmission system 12 and the element switch 131i of the reception system according to the detection / tracking mode and the proximity detection mode. The transfer control circuit 153 controls the transfer amounts of the transmission phase shifter A1 and the reception phase shifter A5 of the transmission / reception module 112i according to the detection / tracking mode and the proximity detection mode.

  The processing operation of the radio wave guidance device having the above configuration will be described below.

First, the switch control time and sampling of the antenna aperture element and the time division DBF will be described with reference to FIG. 5, (a) shows the antenna elements of M rows and N columns and the pulse numbers of the respective line outputs, and (b) shows the pulse repetition period PRI, the transmission pulse width τ, the reception time _tr , and the sampling period t. _SP and switch switching time _tSW are shown. In this case, the pulse repetition period PRI is
PRI = τ + Tr + T _SP + t _SW
Indicated by Because it is in proximity detection mode, the switch switching time is performed before (in advance) the transmission pulse. The signal sequence to be sampled is represented as follows, where J is the number of 1PRI ranges and K is the total number of pulses.

For example, the range 1 (one row) will be described. When the sampling signals are rearranged with the number of antenna elements in the aperture (vertical M rows × horizontal N columns), the range matrix X _NM becomes the following equation.

Here, the beam is formed by multiplying the range matrix X _NM by the beam directing weight W _pmn to _obtain the aperture voltage Y (AZp, ELp) of the antenna beam as in the following equation.

At this time, L types of beam forming weights W _pnm are _assigned to the L types, and simultaneous calculations can be performed to form L types of antenna beams. By performing the same processing on the data in the 2, 3,..., K range, a beam can be formed for the entire range.

Next, a method for forming Σ, ΔAZ, and ΔEL for monopal angle measurement will be described. The analog formation is performed as shown in FIG. That is, the aperture voltages of A, B, C, and D formed by dividing the virtual aperture into four from the equation (2) are calculated, and the calculation result of A + B + C + D is the sum beam, (A + B) − (C + D) The calculated result is an elevation difference beam, and the calculated result of (A + C)-(B + D) is an azimuth difference beam. From the sum beam and the difference beam, the phase monopulse error voltage ε is obtained from the following equation, and the angle is measured based on the error voltage ε.

That is, the miscalculated voltage ε and the angle (AZ, EL) may be tabulated in advance, and the angle (AZ, EL) may be output by quoting the table with the observed error voltage ε.

  Next, rearrangement of the transmission wave frequency, sample time, and data for performing the synthesis band processing will be described with reference to FIG.

  First, as shown in FIG. 6A, the transmission frequency is set to f1, each range data (1 range to J range) is sampled for K elements, and the data of each range is rearranged into K elements to perform beam formation. . Next, the transmission frequency is set to f2, each range data (1 range to J range) is sampled for K elements, and the data of each range is rearranged into K elements to perform beam formation. Similarly, the above processing is repeated for each frequency step. Finally, the transmission frequency is fs, each range data (1 range to J range) is sampled for K elements, and the data of each range is rearranged into K elements to perform beam forming. From the results of f1, f2,..., Fs that have undergone beam forming, synthetic band processing in ranges 1 to J is performed as shown in FIG.

  As described above, according to the configuration of the present embodiment, the objective can be achieved in each scene by adaptively varying the antenna pattern for target detection, target tracking, and proximity detection. That is, in target detection and target tracking, the transmission antenna gain, the reception antenna gain, and the transmission power can be maximized by using a single pencil beam for both transmission and reception. On the other hand, in proximity detection, a transmission fan beam is formed by transmitting with one element antenna in the phased array, and a target detection in a wide angle range is possible by forming a plurality of beams by DBF in the reception beam. Become.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to FIGS. 3, 7, and 8. In the first embodiment, a case where full DBF formation is performed in a time division manner for all of detection, tracking, and proximity detection will be described.

  FIG. 7 is a block diagram showing the configuration of the radio wave guiding apparatus according to the second embodiment, and shows a hardware system for switching the beam shape described above. As in the first embodiment, the radio wave guidance device includes an antenna unit 11, a transmission system 12, a reception system 13, a signal processing unit (CPU or GPU) 14, and a control system 15, and includes the detection / tracking mode, Proximity detection mode is provided.

  As in the first embodiment, the antenna unit 11 includes a transmission / reception module 112i for each element antenna 111i of the phased array. As shown in FIG. 3, the transmission / reception module 112i includes a transmission phase shifter A1, a transmission amplifier A2, a circulator A3, a reception amplifier A4, and a reception phase shifter A5.

  In the transmission system 12, in the detection / tracking mode, a transmission signal in the IF (intermediate wave frequency) band output from the D / A converter 111 is converted into a transmission signal in the RF (transmission frequency) band by the transmitter 112, The analog distributor 124 feeds power to the transmission / reception module 112i of the antenna unit 11, forms a transmission pencil beam in an arbitrary direction and outputs a transmission wave by phase control of the transmission phase shifter A1 in each transmission / reception module 112i. .

  The transmission system 12 includes a D / A converter 121, a transmitter 122, a proximity transmission switch 123, and an analog distributor 124. In the transmission system 12, in the proximity detection mode, the proximity transmission switch 123 sends a transmission signal to the proximity transmission element 113 that does not pass through the transmission / reception module of the antenna unit 11, and radiates a radio wave from the element by a fan beam. Further, the frequency of the transmission signal output from the D / A converter 111 is stepped every time the time-division DBF beam is formed, thereby widening the bandwidth with multipulses.

  The reception system 13 includes a DBF (Digital Beam Forming) switch 133, a receiver 134, and an A / D converter 135. In the reception system 13, the reception signal output from the transmission / reception module 112 i is sent to the DBF switch 133 in both the detection / tracking mode and the proximity detection mode. The DBF switch 133 switches the element signals in order of 1, 2,..., K (K = N × M) and sends them to the receiver 134. The reception output of the receiver 134 is converted into a digital signal by the A / D converter 135 and then supplied to the signal processing unit 14.

Since both the signal processing unit 14 and the control system 15 are the same as those in the first embodiment, a duplicate description is omitted here.
The processing operation of the radio wave guidance device having the above configuration will be described below.

First, the antenna aperture element and the time division DBF switch control time and sampling in the detection / tracking mode will be described with reference to FIG. In FIG. 8, (a) shows antenna elements of M rows and N columns and pulse numbers of respective line outputs, and (b) shows a pulse repetition period PRI, a transmission pulse width τ, a reception time _tr , and a sampling period t. _SP and switch switching time _tSW are shown. In this case, the pulse repetition period PRI is
PRI = τ + Tr + T _SP + t _SW
It becomes. The switch is switched after the transmission pulse.

  The switch control time and sampling time of the antenna aperture element and time-division DBF in the proximity detection mode are the same as described in FIG. Switchover is performed in advance (before transmission pulse). The description of the signal to be stored is the same as that in the first embodiment in each of the detection / tracking mode and the proximity detection mode. In the beam formation in the proximity detection mode, the signal processing unit 14 forms L (multiple beams) sum signals, elevation angle difference signals, and azimuth difference signals. The synthetic band processing in the proximity detection mode is also the same as in the first embodiment, and the transmission frequency is stepped for each beam formation with a K (= N element × M element) pulse, and the signal processing unit for each beam and each range. In 14, the synthesis band processing is performed to increase the resolution.

  Therefore, according to the radio wave guidance device having the above-described configuration, in the target detection and target tracking, the transmission antenna gain, the reception antenna gain, and the transmission power can be maximized by setting the antenna beam as one pencil beam for both transmission and reception. In proximity detection, transmission by one element antenna in the phased array is performed to form a transmission fan beam, and the reception beam is subjected to multiple beam formation by DBF, thereby enabling target detection in a wide angle range.

(Third embodiment)
Hereinafter, a third embodiment will be described with reference to FIGS. 3 and 9 to 12.

  In the third embodiment, the elements of the antenna unit 11 are arranged in a cross shape along the A-axis and the B-axis, and are calculated as a virtual array, compared to the second embodiment.

  9A shows a cross-shaped array arrangement of vertical M elements (A axis) and horizontal M elements (B axis) in the antenna unit 11 according to this embodiment, and FIG. 9B shows vertical M elements. The virtual array when the interpolation signal of virtual element arrangement | positioning is calculated from the received signal of (A axis) and horizontal M element (B axis) is shown. As shown in FIG. 9, the data from each element of the A axis and B axis is taken out in a time-division manner, stored, and multiplied by the outputs of the elements of each axis, so that the same as when M × M elements are arranged on the entire surface. A beam can be formed. At this time, a plurality of beam forming weights can be formed by using a plurality of beam forming weights.

  FIG. 10 is a block diagram showing the configuration of the radio wave guiding apparatus according to the third embodiment, and shows a hardware system for switching the beam shape described above. In FIG. 10, the antenna unit 11 and the reception system 13 are divided into A system (11A, 13A) and B system (11B, 13B), respectively. Each structure is the same as that of 2nd Embodiment shown in FIG. 7, and the transmission / reception module 112i is provided for every element antenna 111i of a phased array. The transmission / reception module 112 indicates the system shown in FIG. 3 (transmission phase shifter A1, transmission amplifier A2, circulator A3, reception amplifier A4, reception phase shifter A5).

  In the above-described configuration, transmission in the detection / tracking mode is performed by using the IF (intermediate wave frequency) signal output from the D / A converter 121 as an RF (transmission frequency) signal by the transmitter 122 and the analog distributor 124 Power is supplied to the element. A transmission pencil beam is formed in an arbitrary direction by the transmission phase shifter A1 of each element, and a transmission wave is output.

  For transmission in the proximity detection mode, radio waves are radiated from the proximity transmission element 113 by the proximity transmission switch 123 without passing through the transmission / reception module. In addition, the frequency of the transmission signal output from the D / A converter 121 is stepped for each time division DBF beam formation, thereby increasing the bandwidth with multipulses. For reception of detection / tracking and proximity detection, the A / B axis transmission / reception module output signals are simultaneously switched sequentially by the DBF switch 133 and input to the two receivers 134 (A, B). The outputs of the two receivers 134 (A, B) are converted into digital signals by the two A / D converters 135 (A, B) and then sent to the signal processing unit 14.

  Here, the relationship between the time division switch control time of the antenna aperture element and the DBF switch 133 in the detection / tracking mode and sampling will be described with reference to FIG. 11A shows a time-division processing panel in which the number of antenna elements is a vertical M element (A axis) and a horizontal M element (B axis) formed in a cross shape, and FIG. 11B shows the A axis and B axis simultaneously. The state of the time-division sample sampled for every element is shown.

As shown in FIG. 11, the time-division sampling of the vertical axis (A axis) and the horizontal axis (B axis) is performed simultaneously. If the pulse repetition period is PRI, the transmission pulse width is τ, the reception time is t _r , the sampling period is t _SP , and the switch switching time is t _SW ,
PRI = τ + Tr + T _SP + t _SW
Indicated by The switch switching time is after the transmission pulse.

  A relationship between the time division switch control time of the antenna aperture element and the DBF switch 133 in the proximity detection mode and sampling will be described with reference to FIG. The switch switching time in the proximity detection mode is performed before the transmission pulse (in advance).

  If a signal sequence is sampled with J as the number of 1PRI ranges and M as the total number of pulses, the results are as follows for the A-axis and B-axis, respectively.

About A-axis

About B-axis

First, as the signal Xin input to the phase center of the array, the biaxial signals Xa and Xb are represented by the following equation when a signal sequence sampled for the above range 1, for example, is shown.

Next, the signal processing unit calculates all element signals by the following virtual array calculation.

Here, AZ indicates AZa (observation angle of the AZ axis viewed from the A-axis array), AZb (observation angle of the AZ axis viewed from the B-axis array. Similarly, EL is ELa (observation angle of the EL axis viewed from the A-axis array) ), ELb (observation angle of the EL axis viewed from the B-axis array).

X _MM indicates a receiving element signal. Next, beam formation is performed by multiplying each component of the matrix on the right side of the equation (2) by the beam directing weight W _pnm .

Moreover, a plurality of forming beams can be formed by having a plurality of types of W _pnm .

Next, with respect to the method of forming Σ, ΔAZ, and ΔEL for monopal angle measurement, as shown in FIG. 4, the analog aperture is divided into four and the aperture voltages of A, B, C, and D are formed. Is calculated from the expression (3), and the calculation of A + B + C + D is the sum beam, (A + B)-(C + D) is the elevation difference beam, and (A + C)-(B + D) is the azimuth difference Become a beam. The angle is measured from the sum beam and difference beam as follows.

The miscalculated voltage ε and the angle (AZ, EL) may be tabulated in advance, and the angle (AZ, EL) may be output by quoting the table with the observed error voltage ε. Since the synthesis band processing, data samples, and data rearrangement in this case are the same as those in the first embodiment, the description thereof is omitted here.

  As described above, even with the radio wave guidance device according to the present embodiment, in target detection and target tracking, the antenna beam is used as one pencil beam for both transmission and reception, and the transmission antenna gain, reception antenna gain, and transmission power are maximized. In proximity detection, transmission by one element antenna in the phased array is performed to form a transmission fan beam, and the reception beam is subjected to multiple beam formation by DBF to achieve target detection in a wide angle range. It becomes possible.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 11 ... Antenna part 11111-111NM ... Element antenna, 11211-112NM ... Transmission / reception module, A1 ... Transmission phase shifter, A2 ... Transmission amplifier, A3 ... Circulator, A4 ... Reception amplifier, A5 ... Reception phase shifter, 113 ... proximity transmission element, 12 ... transmission system, 121 ... D / A converter, 122 ... transmitter, 123 ... proximity transmission switch, 124 ... analog distributor, 13 ... reception system, 13111 to 131NM ... switch element, 132 ... Analog power feeding circuit (sum / azimuth difference / elevation angle difference calculation), 133... DBF switch, 134, 1341 to 1343, 135, 1351 to 1353, A / D converter, 14, signal processor (CPU or GPU), 15 ... Control system, 151 ... Timing generation circuit, 152 ... Switch control circuit, 153 ... Transfer control circuit.

Claims (7)

A detection / tracking means for detecting and tracking a target by adaptively controlling a pattern of an antenna beam by a phased array, and a proximity detection means for detecting a proximity distance to the target,
The detection / tracking means uses a pencil beam as an antenna beam for both transmission and reception.
Proximity detection means performs transmission by one element arranged on the same plane as the phased array to form a transmission fan beam having a wider angle than the pencil beam, and covers the transmission fan beam by DBF (digital beam forming). A radio wave guidance device that forms multiple receive beams in the area. The detection / tracking means performs beam forming by analog synthesis,
The proximity detection means performs a time-division full DBF by switching with a switch,
In the full DBF, the element output of the phased array is switched by a switch for each pulse, and a monopulse beam of a sum beam (Σ) and a difference beam (ΔAZ, ΔEL) is formed using a digital signal of the element output. 1. The radio wave induction device according to 1.   The radio wave guiding apparatus according to claim 1, wherein the detection / tracking unit and the proximity detection unit implement a time-division full DBF by switching a switch. The detection / tracking means and the proximity detection means implement a time-division type virtual two-dimensional element DBF by switching with a switch in the detection, tracking and proximity detection,
The virtual two-dimensional element DBF is time-divided with respect to a digital received signal of M elements arranged in one dimension in the first axis and a digital received signal of M elements arranged in one dimension in a second axis different from the first axis. In addition, by multiplying element signals sequentially Xan × Xbm (n = 1 to M, m = 1 to M), a virtual array signal of M × M elements is generated, and the element signals are sequentially divided into the element signals. The radio wave guiding apparatus according to claim 1, wherein a monopulse beam of a sum beam (Σ) and a difference beam (ΔAZ, ΔEL) is formed by multiplying and adding a predetermined weight.   The radio wave guiding apparatus according to claim 1, wherein the proximity detection unit acquires distance information and angle measurement information from the DBF output when proximity is detected.   2. The radio wave guidance device according to claim 1, wherein the proximity detection means performs a synthetic band process by stepping the frequency for each pulse when proximity detection is performed. It has a detection / tracking mode for detecting and tracking a target by adaptively controlling a pattern of an antenna beam by a phased array, and a proximity detection mode for detecting a proximity distance to the target,
In the detection / tracking mode, the antenna beam is a pencil beam for both transmission and reception.
In the proximity detection mode, transmission is performed by one element arranged on the same plane as the phased array to form a transmission fan beam having a wider angle than the pencil beam, and the transmission fan beam is covered by DBF (digital beam forming). A radio wave induction method for forming a plurality of reception beams in a region.

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