CN115755048A - Target detection system based on P-band radar and broadcast type automatic correlation monitoring - Google Patents
Target detection system based on P-band radar and broadcast type automatic correlation monitoring Download PDFInfo
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Abstract
The invention relates to a target detection system based on P-band radar and broadcast type automatic correlation monitoring, which comprises: the system comprises a broadcast type automatic correlation monitoring module, a data processing module and a data processing module, wherein the broadcast type automatic correlation monitoring module is used for detecting an aerial target, and a detection area of the broadcast type automatic correlation monitoring module comprises a high correlation area and a low correlation area; the P-band radar module is used for detecting an aerial target, and the detection area of the P-band radar module at least comprises the low correlation area; the GPS module is used for providing a time reference for the target detection system; and the information fusion module is used for performing space-time matching and data fusion on the imaging image of the P waveband radar module and the position information output by the broadcast type automatic correlation monitoring module. The invention has the advantages of high aerial target detection probability, high aerial target positioning precision and anti-stealth.
Description
Technical Field
The invention relates to the technical field of radars, in particular to a target detection system based on a P-band radar and broadcast type automatic correlation monitoring.
Background
In the face of increasingly congested airways and increasingly busy airports, surveillance of airborne targets urgently requires sufficient detection probability and accuracy to reduce the minimum safe flight interval, thereby increasing airspace volumetric efficiency. In the present stage, the aviation surveillance service is an investigation system for realizing global aerial target surveillance by using a satellite to intercept and receive ADS-B (broadcast automatic correlation monitoring) information of aerial target broadcasts in orbit.
The ADS-B technology is a very important monitoring technology in the aviation field, particularly the civil aviation field, organically combines conflict detection, conflict avoidance, conflict resolution, air Traffic Control (ATC) monitoring, ATC consistency monitoring and cabin comprehensive information display, and enhances and expands very rich functions for an aviation system. The ADS-B technology enables the aerial target to automatically acquire parameters from relevant airborne equipment and broadcast the position, height, speed, heading, identification number and other information of the aerial target to other aerial targets or ground stations. However, the monitoring of the ADS-B to the aerial target depends on the information broadcasted by the aerial target itself, and it is difficult to accurately monitor the aerial target which does not broadcast or broadcasts the erroneous ADS-B signal. In addition, the gain of the ADS-B signal transmitting antenna carried by the aerial target in the vertical direction is low due to the influence of structures such as the wing and the like, so that a detection blind area of the ADS-B load is formed.
Disclosure of Invention
In view of this, the present invention aims to provide a target detection system based on a P-band radar and a broadcast-type auto-correlation monitoring, which solves the problems of low target detection probability and low accuracy in the current ADS-B detection area.
The embodiment of the invention provides a target detection system based on P-band radar and broadcast type automatic correlation monitoring, which comprises: the system comprises a broadcast type automatic correlation monitoring module, a data processing module and a data processing module, wherein the broadcast type automatic correlation monitoring module is used for detecting an aerial target, and a detection area of the broadcast type automatic correlation monitoring module comprises a high correlation area and a low correlation area; the P-band radar module is used for detecting an aerial target, and the detection area of the P-band radar module at least comprises the low correlation area; the GPS module is used for providing a time reference for the target detection system; and the information fusion module is used for performing space-time matching and data fusion on the imaging image of the P waveband radar module and the position information output by the broadcast type automatic correlation monitoring module.
In a preferred embodiment of the present invention, the P-band radar module is configured to transmit a P-band microwave signal, receive a scattered signal from an airborne target, and obtain the imaging image through a synthetic aperture imaging algorithm.
In a preferred embodiment of the present invention, the GPS module is configured to receive GPS navigation signals and output pulses of seconds to provide a time reference for the target detection system based on P-band radar and broadcast auto correlation monitoring.
In a preferred embodiment of the present invention, the broadcast auto-correlation monitoring module is configured to receive a broadcast auto-correlation monitoring signal of an air target, and output location information of the air target after decoding through a compact location report.
In a preferred embodiment of the present invention, the information fusion module includes: the geometric correction module is used for geometrically correcting the imaging image output by the P-band radar module and the position information output by the broadcast type automatic correlation monitoring module, and the imaging image and the position information are in the same coordinate system; the time calibration module is used for carrying out time matching on the imaging image and the position information through GPS second pulse; the target point association module is used for associating and matching the target point of the imaging image and the position information; the data fusion module is used for carrying out data fusion on the matching data of the time calibration module and the target point association module; and the display module is used for displaying the fusion data of the data fusion module.
In a preferred embodiment of the present invention, the P-band radar module includes a P-band radar antenna for receiving a P-band scattered signal of an aerial target; the broadcast type automatic correlation monitoring module comprises a broadcast type automatic correlation monitoring antenna, and the broadcast type automatic correlation monitoring antenna is used for receiving broadcast type automatic correlation monitoring signals broadcasted by air targets.
In a preferred embodiment of the present invention, the target detection system based on P-band radar and broadcast-type auto-correlation monitoring further includes a radio frequency module, and the radio frequency module includes: the first band-pass filter is used for carrying out band-identity filtering on the broadcast type automatic correlation monitoring signal to obtain a corresponding bandwidth signal; a first three-stage amplifier for power amplifying the output signal of the first band pass filter with a low noise coefficient; the second band-pass filter is used for carrying out secondary band-pass filtering on the output signal of the first three-level amplifier; a first mixer for mixing an output signal of the second band pass filter to an intermediate frequency; the first digital sampling module is used for sampling the output signal of the first mixer and converting the sampling signal into a broadcast type automatic correlation monitoring digital signal; a second mixer for mixing an output signal of the fourth band-pass filter to an intermediate frequency; the second digital sampling module is used for sampling the output signal of the second mixer and converting the sampling signal into a P-band digital signal; the FPGA is used for storing, demodulating, filtering, decoding and imaging the digital signals; and the frequency synthesizer is used for providing local oscillator signals for the first frequency mixer and the second frequency mixer, providing sampling clocks for the first digital sampling module and the second digital sampling module, and providing clock signals for the FPGA.
In a preferred embodiment of the present invention, the P-band radar module comprises a P-band radar digital module, the P-band radar digital module comprising: the first digital domain band-pass filter is used for performing band-pass filtering on the P-band digital signal; a first digital signal generator for generating IQ-demodulated sine and cosine signals; a first multiplier for multiplying the output signal of the first digital domain bandpass filter with the negative sinusoidal signal output by the first digital signal generator; a first low pass filter for low pass filtering an output signal of the first multiplier; a second multiplier for multiplying the output signal of the first digital domain band-pass filter with the cosine signal output by the first digital signal generator; a second low pass filter for low pass filtering an output signal of the second multiplier; a first adder for adding an output signal of the first low-pass filter and an output signal of the second low-pass filter to obtain a modulus of an input signal; the matched filtering module is used for performing matched filtering on the output signal of the first adder to realize pulse compression; and the synthetic aperture imaging module is used for performing synthetic aperture imaging on the output signal of the matched filtering module.
In a preferred embodiment of the present invention, the broadcast auto-correlation monitoring module further comprises a broadcast auto-correlation monitoring digital module, and the broadcast auto-correlation monitoring digital module comprises: the second digital domain band-pass filter is used for performing band-pass filtering on the broadcast type automatic correlation monitoring digital signal; a second digital signal generator for generating IQ-demodulated sine and cosine signals; a third multiplier for multiplying the output signal of the second digital domain bandpass filter with the negative sinusoidal signal output by the second digital signal generator; a third low-pass filter for low-pass filtering an output signal of the third multiplier; a fourth multiplier, for multiplying the second digital domain band-pass filter with the cosine signal output by the second digital signal generator; a fourth low-pass filter for low-pass filtering an output signal of the fourth multiplier; a second adder for adding an output signal of the third low-pass filter and an output signal of the fourth low-pass filter to obtain a modulus of an input signal; a header positioning module for detecting a header of an output signal of the second adder; a bit decision module for detecting a low confidence bit in the output signal of the second adder; the error correction module is used for correcting the error of the message of the output signal of the second adder; the cyclic redundancy check module is used for carrying out coding check on the message; the message discarding module is used for discarding the unqualified part in the message; and the concise position report decoding module is used for carrying out concise position report decoding on the message.
In a preferred embodiment of the present invention, the P-band radar module includes a P-band radar antenna installed toward the ground; the broadcast type automatic correlation monitoring module comprises a broadcast type automatic correlation monitoring antenna which is installed towards the ground; the GPS module includes a GPS antenna mounted toward the sky.
The target detection system based on the P-band radar and the broadcast type automatic correlation monitoring of the embodiment of the invention utilizes the P-band radar to carry out high-probability detection on the air target in a large-scale air area, particularly in a low correlation area of the broadcast type automatic correlation monitoring, utilizes the broadcast type automatic correlation monitoring module to receive the broadcast information of the air target in the high correlation area to obtain high-precision position information of the air target, utilizes the second pulse received by a GPS antenna to provide time reference for the P-band radar and the broadcast type automatic correlation monitoring module, and utilizes the information fusion module to carry out space-time matching on the air target detection image in the large scale obtained by the P-band radar and the air target position information in the high correlation area obtained by the broadcast type automatic correlation monitoring module, and then carries out information fusion to realize high-precision target detection and positioning on the air target.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a target detection system based on a P-band radar and broadcast-type automatic correlation monitoring according to an embodiment of the present invention;
FIG. 2 is a schematic view of a working scene of a target detection system based on a P-band radar and a broadcast-type auto-correlation monitoring according to an embodiment of the present invention;
FIG. 3 is a schematic processing flow diagram of a radio frequency module according to an embodiment of the present invention;
FIG. 4 is a schematic processing flow diagram of a P-band radar digital module according to an embodiment of the present invention;
fig. 5 is a schematic processing flow diagram of the ADS-B digital module according to an embodiment of the present invention.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are to be considered part of the entire written description. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified for convenience. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
Fig. 1 is a schematic structural diagram of a target detection system based on P-band radar and broadcast-type auto-correlation monitoring according to an embodiment of the present invention, where the target detection system based on P-band radar and broadcast-type auto-correlation monitoring includes a P-band radar module 10, a GPS module 20, a broadcast-type auto-correlation monitoring module 30, and an information fusion module 40. For brevity, the Broadcast auto-correlation monitoring is abbreviated as ADS-B (Automatic Dependent-Broadcast), i.e., the ADS-B module 30 represents the Broadcast auto-correlation monitoring module 30. The detection area of the ADS-B module 30 includes a high correlation area and a low correlation area, where the high correlation area refers to an area with a high detection probability, and generally refers to an air target in the area that mainly broadcasts ADS-B signals; the low correlation area refers to an area with low detection probability, and generally includes an area where an aerial target which does not broadcast or broadcasts a wrong ADS-B signal is located, and an area where the gain in the vertical direction is low due to structural influences of wings of the target and the like, so that a detection blind area of the ADS-B load is formed.
The P-band radar module 10 is used for high probability detection of airborne targets over a wide range of airborne areas, particularly low correlation areas in the detection area of the ADS-B module 30. The GPS module 20 receives the GPS second pulse and provides a time reference for the target detection system based on the P-band radar and broadcast auto-correlation monitoring. The ADS-B module 30 is configured to receive air target broadcast information in a low correlation area and obtain high-precision position information of an air target. The information fusion module 40 is configured to perform space-time matching on the imaging image of the P-band radar module 10 and the position information output by the ADS-B module 30, and then perform data fusion display.
According to the embodiment of the invention, the ADS-B module 30 is used for receiving the position information broadcasted by the aerial target to realize high-precision positioning on the aerial target, so that the positioning capability of the system on the aerial target can be effectively improved, and meanwhile, for the detection low-probability area of the ADS-B module 30, the P-band radar module 10 is used for searching the aerial target, so that the detection capability and the anti-stealth detection capability of the system on the aerial target are further improved.
However, it should be understood that, although the P-band radar module 10 and the ADS-B module 30 may be complementary in the embodiment of the present invention, they should not be understood as an alternative relationship, that is, the ADS-B module 30 may also receive broadcast information of air targets in a low correlation area, and the P-band radar module 10 may also search for air targets in a high correlation area.
As shown in fig. 1, in the present embodiment, the P-band radar module 10 is configured to transmit a microwave signal in a P-band, receive a scattering signal from an aerial target, and obtain an SAR image through a synthetic aperture imaging (SAR) algorithm, where all SAR images are imaging images output by the P-band radar module 10. The GPS module 20 is configured to receive GPS navigation signals and output pulses of seconds to provide a time reference for the target detection system based on P-band radar and broadcast-based auto-correlation monitoring. The ADS-B module 30 is configured to receive the ADS-B signal of the aerial target, and output the position information of the aerial target after decoding through a Compact Position Report (CPR).
As shown in fig. 1, in the present embodiment, the information fusion module 40 includes: the geometric correction module 401 is configured to perform geometric correction on the SAR image so that the SAR image and the aerial target output by the ADS-B module 30 are in the same coordinate system; a time calibration module 402, configured to perform time matching on the SAR image and the output information of the ADS-B module 30 through GPS second pulses; a target point association module 403, configured to perform target point matching association between the SAR image and the aerial target output by the ADS-B module 30; a data fusion module 404, configured to perform data fusion on the position information output by the ADS-B module 30 and the detection information detected by the P-band radar module 10; and a display module 405, configured to display the fused data.
The information fusion module 40 utilizes the pulse per second received by the GPS module 20 to realize time matching of the detection data of the P-band radar module 10 and the detection data of the ADS-B module 30, and utilizes a longitude and latitude high three-dimensional coordinate system to realize space matching of the detection data of the P-band radar module 10 and the detection data of the ADS-B module 30, so that the time and space data fusion of the detection data of the P-band radar module 10 and the detection data of the ADS-B module 30 is utilized, and the detection probability and the positioning accuracy of an aerial target are improved.
As shown in fig. 2, in this embodiment, the orbit height of the satellite where the target detection system based on the P-band radar and the broadcast-based auto correlation monitoring is located is H, and the target detection system has three antennas, namely a P-band radar antenna and an ADS-B antenna installed to the ground and a GPS antenna installed to the sky. Firstly, a P-band radar module 10 is used for obtaining a detection image of an air-centered target in a detection width L range, an ADS-B module 30 is used for obtaining position information of the air target outside a detection blind area, the detection image and the position information are subjected to space-time matching, information fusion is carried out, and high-precision positioning information of the air target in the ADS-B detection area and the air target in the detection blind area are obtained.
Preferably, the P-band radar antenna is installed on the ground in a mechanical arm and folding and bouncing mode, the isolation of the P-band radar antenna to ADS-B signals is better than 40dB, and the signal detection sensitivity of the P-band antenna is better than-90 dB.
Preferably, the ADS-B antenna adopts a phased array antenna, the collision mitigation of the ADS-B signal is realized by utilizing the beam space division capability of the phased array antenna, the isolation of the ADS-B antenna to the P-band signal is better than 40dB, and the signal sensitivity of the ADS-B antenna is better than-90 dB.
As shown in fig. 3, in this embodiment, the target detection system based on P-band radar and broadcast-type auto correlation monitoring further includes a radio frequency module, where the radio frequency module includes: the ADS-B antenna 201 is used for receiving ADS-B signals broadcasted by aerial targets; a first band pass filter (BRF) 202, configured to perform band-pass filtering on the ADS-B signal to obtain a corresponding bandwidth signal; a first three-stage amplifier (LAN) 203 for power amplifying the ADS-B signal with a low noise figure; a second band pass filter (BRF) 204 for second pass band filtering the ADS-B signal; a first mixer 205 for mixing the ADS-B signal to an intermediate frequency; a first digital (ADC) sampling module 206, configured to sample an intermediate frequency signal of the ADS-B signal and convert an analog signal into a digital signal; a P-band radar antenna 208 for receiving a P-band scattered signal of an aerial target; a second mixer 212 for mixing the P-band scattered signal to an intermediate frequency; a second digital (ADC) sampling module 213, configured to sample an intermediate frequency signal of the P-band scattered signal, and convert the analog signal into a digital signal; a plurality of FPGAs (214) for storing, demodulating, filtering, decoding, and imaging the digital signals; a frequency synthesizer 207 for providing local oscillator signals to the first mixer 205 and the second mixer 212, sampling clocks to the first digital (ADC) sampling module 206 and the second digital (ADC) sampling module 213, and clock signals to the FPGA (214); a third band pass filter (BRF) 209 for band pass filtering the P-band scattered signal; a second three-stage amplifier (LAN) 210 for power amplifying the P-band scattered signal with a low noise figure; a fourth bandpass filter (BRF) 211 for second-order bandpass filtering of the P-band scattered signal. Since the P-band scattering signals are no longer completely identical signals after different operations (such as filtering and amplification), but are still P-band scattering signals in nature, the P-band scattering signals are named, and independent names such as "primary filtering P-band scattering signals", "primary amplification secondary filtering P-band scattering signals" and the like are not adopted, but a person skilled in the art can directly and unambiguously determine the specific forms of the P-band signals at different stages according to fig. 3, so that the embodiment is not described in detail herein, and in addition, other signals are the same hereinafter.
As shown in fig. 4, in the present embodiment, the P-band radar includes a P-band radar digital module, and the P-band radar digital module includes: the first digital domain band-pass filter 301 is used for performing band-pass filtering on the digital signal to reduce noise; a first digital signal generator (DDS) 302 for generating IQ-demodulated sine and cosine signals; a first multiplier 303 for multiplying the P-band digital signal by a negative sinusoidal signal; the first low-pass filter 304 is configured to perform low-pass filtering on the P-band digital signal to obtain an I-channel signal; a second multiplier 305 for multiplying the P-band digital signal by the cosine signal; the second low-pass filter 306 is used for performing low-pass filtering on the P-band digital signal to obtain a Q-path signal; a first adder 307, configured to add the I-path signal and the Q-path signal to obtain a modulus of the input signal; a matched filtering module 308, configured to perform matched filtering on the digital signal to implement pulse compression; a synthetic aperture imaging module 309, configured to perform Synthetic Aperture (SAR) imaging on the input multichannel signal.
As shown in fig. 5, in this embodiment, the target detection system based on the P-band radar and the broadcast-based automatic correlation monitoring further includes an ADS-B digital module, where the ADS-B digital module includes: a second digital domain band pass filter (BRF) 401, configured to perform band pass filtering on the digital signal to reduce noise; a second digital signal generator 402 for generating IQ-demodulated sine and cosine signals; a third multiplier 403 for multiplying the ADS-B digital signal with a negative sinusoidal signal; a third low-pass filter 404, configured to perform low-pass filtering on the ADS-B digital signal to obtain an I-path signal; a fourth multiplier 405, configured to multiply the ADS-B digital signal with the cosine signal; a fourth low-pass filter 406, configured to perform low-pass filtering on the ADS-B digital signal to obtain a Q-path signal; a second adder 407, configured to add the I-path signal and the Q-path signal to obtain a modulus of the input signal; a header positioning module 408 for detecting a header of the ADS-B digital signal; a bit decision module 409 for detecting low confidence bits; the error correction module 410 is configured to correct a message of the ADS-B digital signal; a Cyclic Redundancy Check (CRC) module 411, configured to perform coding check on the packet; a message discarding module 412, configured to discard a message; a compact location report decoding module 413 configured to decode a compact location (CPR) report on the message.
In summary, in the target detection system based on P-band radar and broadcast-type automatic correlation monitoring according to the embodiment of the present invention, the P-band radar is used to perform high probability detection on an aerial target in a large-scale aerial region, especially in a low-correlation region of broadcast-type automatic correlation monitoring, the broadcast-type automatic correlation monitoring module is used to receive broadcast information of the aerial target in the high-correlation region to obtain high-precision position information of the aerial target, the pulse per second received by the GPS antenna is used to provide a time reference for the P-band radar and the broadcast-type automatic correlation monitoring module, the information fusion module performs space-time matching on an aerial target detection image in the large-scale aerial target obtained by the P-band radar and the position information of the aerial target in the high-correlation region obtained by the broadcast-type automatic correlation monitoring module, and then performs information fusion to achieve high-precision target detection and positioning on the aerial target.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A target detection system based on P-band radar and broadcast-based automatic correlation monitoring, the target detection system comprising:
the system comprises a broadcast type automatic correlation monitoring module (30) for detecting an aerial target, wherein a detection area of the broadcast type automatic correlation monitoring module (30) comprises a high correlation area and a low correlation area;
a P-band radar module (10) for detecting an airborne target, a detection area of the P-band radar module (10) including at least the low correlation area;
a GPS module (20) for providing a time reference for the object detection system; and
and the information fusion module (40) is used for performing space-time matching and data fusion on the imaging image of the P-band radar module (10) and the position information output by the broadcast type automatic correlation monitoring module (30).
2. The P-band radar and broadcast-based auto-correlation monitoring target detection system according to claim 1, wherein the P-band radar module (10) is configured to transmit a P-band microwave signal and receive a scattered signal from an airborne target, and obtain the imaged image through a synthetic aperture imaging algorithm.
3. The P-band radar and broadcast auto-correlation monitoring based object detection system of claim 1, wherein the GPS module (20) is configured to receive GPS navigation signals and output pulses of seconds to provide a time reference for the object detection system.
4. The P-band radar and broadcast-based auto-correlation monitoring target detection system according to claim 1, wherein the broadcast-based auto-correlation monitoring module (30) is configured to receive a broadcast-based auto-correlation monitoring signal of an aerial target, and output position information of the aerial target after decoding through a compact position report.
5. The P-band radar and broadcast-based automatic correlation monitoring target detection system according to claim 1, wherein the information fusion module (40) comprises:
a geometric correction module (401) for geometrically correcting the imaging image output by the P-band radar module (10) and the position information output by the broadcast-type automatic correlation monitoring module (30) to be in the same coordinate system;
a time calibration module (402) for time matching the imaged image and the location information by a GPS second pulse;
a target point association module (403) for associating and matching the target point of the imaging image with the position information;
a data fusion module (404) for performing data fusion on the matching data of the time calibration module (402) and the target point association module (403);
a display module (405) for displaying the fused data of the data fusion module (404).
6. The P-band radar and broadcast-based auto-correlation monitoring target detection system of claim 1, wherein the P-band radar module (10) comprises a P-band radar antenna (208), the P-band radar antenna (208) configured to receive a P-band scattered signal of an aerial target;
the broadcast type automatic correlation monitoring module (30) comprises a broadcast type automatic correlation monitoring antenna (201), and the broadcast type automatic correlation monitoring antenna (201) is used for receiving broadcast type automatic correlation monitoring signals broadcasted by an aerial target.
7. The P-band radar and broadcast-based auto-correlation monitoring target detection system of claim 6, further comprising a radio frequency module, the radio frequency module comprising:
a first band-pass filter (202) for performing band-identity filtering on the broadcast auto-correlation monitor signal to obtain a corresponding bandwidth signal;
a first three-stage amplifier (203) for power amplifying an output signal of the first band-pass filter (202) with a low noise figure;
a second band-pass filter (204) for second-order band-pass filtering an output signal of the first three-stage amplifier (203);
a first mixer (205) for mixing an output signal of the second band-pass filter (204) to an intermediate frequency;
a first digital sampling module (206) for sampling the output signal of the first mixer (205) and converting the sampled signal into a broadcast auto-correlation monitoring digital signal;
a second mixer (212) for mixing an output signal of the fourth band-pass filter (211) to an intermediate frequency;
a second digital sampling module (213) for sampling the output signal of the second mixer (212) and converting the sampled signal into a P-band digital signal;
a plurality of FPGAs (214) for storing, demodulating, filtering, decoding, and imaging the digital signals;
a frequency synthesizer (207) for providing local oscillator signals to the first mixer (205) and the second mixer (212), and for providing sampling clocks to the first digital sampling module (206) and the second digital sampling module (213), and for providing clock signals to the FPGA (214).
8. The P-band radar and broadcast-based auto-correlation monitoring target detection system of claim 7, wherein the P-band radar module (10) comprises a P-band radar digital module comprising:
a first digital domain band pass filter (301) for band pass filtering the P-band digital signal;
a first digital signal generator (302) for generating IQ-demodulated sine and cosine signals;
-a first multiplier (303) for multiplying the output signal of the first digital domain bandpass filter (301) with the negative sinusoidal signal output by the first digital signal generator (302);
a first low-pass filter (304) for low-pass filtering an output signal of the first multiplier (303);
-a second multiplier (305) for multiplying the output signal of the first digital domain bandpass filter (301) with the cosine signal output by the first digital signal generator (302);
-a second low-pass filter (306) for low-pass filtering an output signal of said second multiplier (305);
-a first adder (307) for adding the output signal of the first low-pass filter (304) and the output signal of the second low-pass filter (306) to a modulus of the input signal;
a matched filtering module (308) for performing matched filtering on the output signal of the first adder (307) to realize pulse compression;
a synthetic aperture imaging module (309) for synthetic aperture imaging of the output signal of the matched filtering module.
9. The P-band radar and broadcast-based auto-correlation monitoring target detection system of claim 1, wherein the broadcast auto-correlation monitoring module (30) further comprises a broadcast auto-correlation monitoring digital module, the broadcast auto-correlation monitoring digital module comprising:
a second digital domain band pass filter (401) for band pass filtering the broadcast auto-correlation monitor digital signal;
a second digital signal generator (402) for generating IQ-demodulated sine and cosine signals;
-a third multiplier (403) for multiplying the output signal of the second digital domain bandpass filter (401) with the negative sinusoidal signal output by the second digital signal generator (402);
a third low-pass filter (404) for low-pass filtering an output signal of the third multiplier (403);
-a fourth multiplier (405) for multiplying the second digital domain bandpass filter (401) with the cosine signal output by the second digital signal generator (402);
-a fourth low-pass filter (406) for low-pass filtering an output signal of said fourth multiplier (405);
-a second adder (407) for adding the output signal of the third low-pass filter (404) and the output signal of the fourth low-pass filter (406) to a modulus of the input signal;
a header positioning module (408) for detecting a header of an output signal of the second adder (407);
a bit decision module (409) for detecting low confidence bits in the output signal of the second adder (407);
an error correction module (410) for correcting a message of an output signal of the second adder (407);
a cyclic redundancy check module (411) for performing coding check on the message;
a message discarding module (412) for discarding the unqualified part in the message;
and a compact location report decoding module (413) for compact location report decoding of the message.
10. The P-band radar and broadcast automatic correlation monitoring based object detection system of any one of claims 6-9, wherein the P-band radar antenna (208) and the broadcast automatic correlation monitoring antenna (201) are ground-oriented and the GPS module (20) comprises a sky-oriented GPS antenna.
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