CN117148393A - Global polarized aerial target detection device and method based on GNSS external radiation source - Google Patents
Global polarized aerial target detection device and method based on GNSS external radiation source Download PDFInfo
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Classifications
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
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- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a full-polarization aerial target detection device and method based on a GNSS (Global navigation satellite System) external radiation source, and relates to the field of radar target detection of external radiation sources; the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna are all connected with the positioning system; the omnidirectional antenna is used for receiving direct signals directly emitted by the GNSS satellite; the left-hand circularly polarized antenna is used for receiving left-hand reflected signals of GNSS satellites reflected by an aerial target; the right-hand circularly polarized antenna is used for receiving right-hand reflected signals of GNSS satellites reflected by an aerial target; the positioning system is used for detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal. The invention can improve the detection probability and the detection precision.
Description
Technical Field
The invention relates to the field of radar target detection of external radiation sources, in particular to a full-polarization aerial target detection device and method based on GNSS external radiation sources.
Background
The inherent defects of the traditional radar are obvious, particularly in military aspect, the fixed detection mode of the traditional radar is more and more difficult to adapt to complex and changeable electromagnetic environments on a modern battlefield, and novel equipment such as a high-speed, high-sensitivity and broadband anti-radiation missile, a high-power microwave weapon and the like is appeared, so that the battlefield living environment of the traditional radar is subjected to increasingly severe challenges. Passive radar has the characteristics of distributed characteristics and electromagnetic silence, and is almost hardly found and destroyed by enemies on the battlefield. Generally, the radiation source of active radar is expensive both in construction and maintenance, and the radar receiving station is inexpensive. The passive radar technology is mastered, and the enemy can be monitored by using the radiation source of the enemy huge-resource-repellent construction with low cost, so that the method has good economic and military benefits. In addition, the passive radar can work in a plurality of frequency bands simultaneously or alternately, and the anti-interference capability is obviously enhanced.
Existing GNSS external source radars typically provide forward channels to detect an air target. The forward detection mode can only be effective under a harsher geometric configuration, so that the detection range is small, the utilization rate of GNSS satellite signals is low, and a large amount of signal resources are wasted. In addition, the forward scattering radar has no distance resolution, can only judge whether an aerial target appears or not, and cannot know the specific position of the target.
Therefore, a method capable of improving the detection probability and the detection accuracy is required.
Disclosure of Invention
The invention aims to provide a full-polarization aerial target detection device and method based on an GNSS external radiation source, which can improve detection probability and detection precision.
In order to achieve the above object, the present invention provides the following solutions:
a fully polarized airborne object detection device based on an external GNSS radiation source, comprising: an omni-directional antenna, a left-handed circularly polarized antenna, a right-handed circularly polarized antenna and a positioning system;
the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna are all connected with the positioning system;
the omnidirectional antenna is used for receiving direct signals directly emitted by the GNSS satellite; the left-hand circularly polarized antenna is used for receiving left-hand reflected signals of GNSS satellites reflected by an aerial target; the right-hand circularly polarized antenna is used for receiving right-hand reflected signals of GNSS satellites reflected by an aerial target; the positioning system is used for detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal.
Optionally, the positioning system includes a target signal detection module and a target positioning module connected to the target signal detection module;
the target signal detection module is used for carrying out target detection according to the direct signal, the left-handed reflection signal and the right-handed reflection signal, and determining whether an aerial target exists or not; when the target signal detection module detects that an aerial target exists, the target positioning module performs aerial target positioning according to the output of the target signal detection module.
Optionally, the target signal detection module specifically includes a correlation processing sub-module, a polarization fusion sub-module, a threshold detection sub-module and a parameter estimation sub-module which are sequentially connected;
the correlation processing sub-module is used for performing correlation processing on the direct signal and the left-hand reflection signal to obtain a time delay-Doppler two-dimensional image of the left-hand circularly polarized channel; the method is also used for carrying out correlation processing on the direct signal and the right-hand reflected signal to obtain a time delay-Doppler two-dimensional image of the right-hand circularly polarized channel;
the polarization fusion submodule is used for carrying out polarization fusion on the time delay-Doppler two-dimensional image of the left-hand circular polarization channel and the time delay-Doppler two-dimensional image of the right-hand circular polarization channel to obtain a fused time delay-Doppler two-dimensional image;
the threshold detection submodule is used for carrying out constant false alarm detection on the fused delay-Doppler two-dimensional image and determining whether an air target exists or not;
and the parameter estimation submodule is used for determining a time delay estimation value according to the fused time delay-Doppler two-dimensional image when the aerial target exists and sending the time delay estimation value to the target positioning module.
Optionally, the positioning system further comprises a noise amplification module;
the noise amplification module is respectively connected with the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna; the noise amplification module is also connected with the target signal detection module; the noise amplification module is used for amplifying the power of the voltage signals converted from the direct signal, the left-handed reflection signal and the right-handed reflection signal.
Optionally, the positioning system further comprises a band pass filter module;
the noise amplification module is connected with the target signal detection module through the band-pass filter module; the band-pass filter module is used for filtering noise parts in the voltage signals subjected to power amplification.
Optionally, the positioning system further comprises a down-conversion module;
the band-pass filter module is connected with the target signal detection module through the down-conversion module; the down-conversion module is used for performing frequency conversion on the voltage signal subjected to noise filtering.
Optionally, the positioning system further comprises an acquisition card;
the down-conversion module is connected with the target signal detection module through the acquisition card; the acquisition card is used for sampling and quantizing the frequency-converted voltage signals.
Optionally, the target positioning module comprises a space ellipsoidal equation construction sub-module, an equation set construction sub-module and a solving sub-module which are connected in sequence;
the space ellipsoidal equation construction submodule is connected with the parameter estimation submodule; the space ellipsoidal equation construction submodule is used for constructing a space ellipsoidal equation according to the time delay estimated value;
the equation set construction submodule is used for constructing an equation set according to a plurality of space ellipsoidal equations;
and the solving sub-module is used for solving the equation set to obtain the position of the aerial target.
The invention also provides a full-polarization aerial target detection method based on the GNSS external radiation source, which is applied to the full-polarization aerial target detection device based on the GNSS external radiation source, and comprises the following steps:
acquiring direct signals of GNSS satellites in direct incidence, left-handed reflection signals of GNSS satellites reflected by aerial targets and right-handed reflection signals of GNSS satellites reflected by aerial targets;
and detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a full polarization aerial target detection device based on an GNSS external radiation source, which comprises: an omni-directional antenna, a left-handed circularly polarized antenna, a right-handed circularly polarized antenna and a positioning system; the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna are all connected with the positioning system; the omnidirectional antenna is used for receiving direct signals directly emitted by the GNSS satellite; the left-hand circularly polarized antenna is used for receiving left-hand reflected signals of GNSS satellites reflected by an aerial target; the right-hand circularly polarized antenna is used for receiving right-hand reflected signals of GNSS satellites reflected by an aerial target; the positioning system is used for detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal. GNSS satellites are used as external radiation sources, so that all-day, all-weather and full-coverage airspace detection can be realized. And the reflected signals of the left-hand circular polarization mode and the right-hand circular polarization mode are fused and detected, electromagnetic resources in space are fully utilized, and compared with the detection mode of single polarization, the detection probability and the detection precision are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of the overall architecture of a full polarization aerial object detection device based on an GNSS external radiation source provided by the invention;
FIG. 2 is a view of a detection scenario of a fully polarized airborne object detection device based on an external GNSS source.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a full-polarization aerial target detection device and method based on an GNSS external radiation source, which can improve detection probability and detection precision.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 and 2, the present invention provides a full polarization aerial object detection device based on an external GNSS radiation source, including: an omni-directional antenna, a left-handed circularly polarized antenna, a right-handed circularly polarized antenna and a positioning system.
The omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna are all connected with the positioning system; the omnidirectional antenna is used for receiving direct signals directly emitted by the GNSS satellite; the left-hand circularly polarized antenna is used for receiving left-hand reflected signals of GNSS satellites reflected by an aerial target; the right-hand circularly polarized antenna is used for receiving right-hand reflected signals of GNSS satellites reflected by an aerial target; the positioning system is used for detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal.
The omnidirectional antenna is used for receiving GNSS direct-injection signals, the left-hand circular polarized antenna is used for receiving left-hand circular polarized components in target reflection signals, the right-hand circular polarized antenna is used for receiving right-hand circular polarized components in target reflection signals, the omnidirectional antenna converts received satellite direct-injection signals into voltage signals from electromagnetic signals, the left-hand circular polarized antenna converts the left-hand components of received aerial target reflection signals into voltage signals from electromagnetic signals, and the right-hand circular polarized antenna converts the right-hand components of received aerial target reflection signals into voltage signals from electromagnetic signals for processing by a subsequent module.
In practical application, the omni-directional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna are all receiving antennas with certain polarization directions, direct signals and scattered signals of the GNSS satellites are received towards the selected directions and converted into voltage signals by electromagnetic signals, and the GNSS signals are modulated by binary phase shift keying (Binary Phase Shift Keying, BPSK), and the signal structures are as follows: s (t) =ac (t) D (t) e j2πft Wherein s (t) is a GNSS satellite direct signal, A is the amplitude of the direct signal, C (t) is a pseudo-random code sequence modulated on the direct signal, D (t) is a navigation message sequence modulated on the direct signal, f is the Doppler frequency of the direct signal, e j2πft Is the carrier of the signal and t is time.
The omni-directional antenna converts the received direct GNSS satellite signals from electromagnetic signals to voltage signals, and the signal r (t) received by the omni-directional antenna can be expressed as r (t) =s (t) +n (t), where n (t) is a noise signal.
GNSS satellite signals reflected by the received aerial targets by the left-hand circularly polarized antennaThe left-hand circularly polarized component of (2) is converted into a voltage signal from an electromagnetic signal, and the signal r is received by a left-hand circularly polarized antenna L (t) can be expressed as: r is (r) L (t)＝R L s(t-Δτ)e j2πΔft +n (t), where R L For energy loss due to polarization change, Δτ represents the time delay difference on the reflected and direct paths, and Δf represents the doppler shift due to the motion of the object in the air.
The right-hand circularly polarized antenna converts the right-hand circularly polarized component of the received GNSS satellite signal reflected by the aerial target from an electromagnetic signal to a voltage signal, and the signal r is received by the right-hand circularly polarized antenna R (t) can be expressed as: r is (r) R (t)＝R R s(t-Δτ)e j2πΔft +n (t), where R R Representing the energy loss due to signal scattering.
The positioning system comprises a target signal detection module and a target positioning module connected with the target signal detection module; the target signal detection module is used for carrying out target detection according to the direct signal, the left-handed reflection signal and the right-handed reflection signal, and determining whether an aerial target exists or not; when the target signal detection module detects that an aerial target exists, the target positioning module performs aerial target positioning according to the output of the target signal detection module.
The target signal detection module can detect whether a target signal exists or not. The target signal detection module captures and tracks a reference signal, carries out coherent integration and incoherent accumulation on a left-hand circular polarization signal and a right-hand circular polarization signal reflected by a target and the reference signal respectively, fuses incoherent accumulation results of the left-hand circular polarization signal and the right-hand circular polarization signal, extracts signal power information at different time delay and Doppler positions, judges whether an aerial target appears through constant false alarm detection, and gives time delay and Doppler estimation of a target reflected signal for processing by a subsequent target positioning module. The target signal detection module specifically comprises a related processing sub-module, a polarization fusion sub-module, a threshold detection sub-module and a parameter estimation sub-module which are connected in sequence.
The correlation processing sub-module is used for performing correlation processing on the direct signal and the left-hand reflection signal to obtain a time delay-Doppler two-dimensional image of the left-hand circularly polarized channel; and the method is also used for carrying out correlation processing on the direct signal and the right-hand reflected signal to obtain a time delay-Doppler two-dimensional image of the right-hand circularly polarized channel.
The polarization fusion submodule is used for carrying out polarization fusion on the time delay-Doppler two-dimensional image of the left-hand circular polarization channel and the time delay-Doppler two-dimensional image of the right-hand circular polarization channel to obtain a fused time delay-Doppler two-dimensional image. The fused delay-Doppler two-dimensional image has a higher signal-to-noise ratio and a greater detection probability than the two-dimensional image before fusion.
And the threshold detection submodule is used for carrying out constant false alarm detection on the fused delay-Doppler two-dimensional image and determining whether an air target exists. Maintaining false alarm probability P fa At 0.95, the detection probability P is selected d And if the peak value of the fused delay-Doppler two-dimensional image is larger than the threshold value, the aerial target is considered to appear, and if not, the aerial target is considered to be absent.
And the parameter estimation submodule is used for determining a time delay estimation value according to the fused time delay-Doppler two-dimensional image when the aerial target exists and sending the time delay estimation value to the target positioning module. If the result of the constant false alarm detection is that an air target exists, taking a time delay value and a Doppler value corresponding to a peak point of the fused time delay-Doppler two-dimensional image as estimated values of a time delay difference and a Doppler difference of a GNSS signal on a direct path and a GNSS signal on a reflection path, taking half of the width of a main lobe of a time delay slice at the peak point as an estimated error of the time delay estimated value, and taking half of the width of the main lobe of the Doppler slice at the peak point as an error of the Doppler estimated value.
The positioning system further comprises a noise amplification module; the noise amplification module is respectively connected with the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna; the noise amplification module is also connected with the target signal detection module; the noise amplification module is used for amplifying the power of the voltage signals converted from the direct signal, the left-handed reflection signal and the right-handed reflection signal. The noise amplifying module is a low noise amplifying module and is used for amplifying the power of the received voltage signal.
The positioning system further comprises a band-pass filter module; the noise amplification module is connected with the target signal detection module through the band-pass filter module; the band-pass filter module is used for filtering noise parts in the voltage signals subjected to power amplification. Specifically, the band-pass filter module carries out band-pass filtering on signals received by the 3 antennas, noise in the signals is filtered, and the signal to noise ratio is improved.
The positioning system further comprises a down-conversion module; the band-pass filter module is connected with the target signal detection module through the down-conversion module; the down-conversion module is used for performing frequency conversion on the voltage signal subjected to noise filtering. Specifically, the down-conversion module is used for converting the signals with noise filtered from high-frequency signals into intermediate-frequency signals.
The positioning system also comprises an acquisition card; the down-conversion module is connected with the target signal detection module through the acquisition card; the acquisition card is used for sampling and quantizing the frequency-converted voltage signals. The acquisition card is a high-speed acquisition card and is used for sampling and quantizing analog intermediate frequency signals, and particularly converting the intermediate frequency analog signals into digital signals.
The target positioning module comprises a space ellipsoidal equation construction sub-module, an equation set construction sub-module and a solving sub-module which are connected in sequence; the space ellipsoidal equation construction submodule is connected with the parameter estimation submodule; the space ellipsoidal equation construction submodule is used for constructing a space ellipsoidal equation according to the time delay estimated value; the equation set construction submodule is used for constructing an equation set according to a plurality of space ellipsoidal equations; and the solving sub-module is used for solving the equation set to obtain the position of the aerial target. The target positioning module is used for calculating the position of the target in the three-dimensional space according to the time delay difference and Doppler difference information of the direct channel and the reflection channel. The target positioning module maps the signal space to the geometric space, gives an estimated value of the target position through an ellipsoid intersection method, specifically takes the time delay estimated value given by the parameter estimation submodule as input, the time delay value of each satellite can construct a space ellipsoid equation, 4 different space ellipsoid equations form an equation set, and the positioning of the air target is realized by solving the intersection points of the space ellipsoids.
According to the invention, GNSS satellite signals are selected as an external radiation source, direct signals of GNSS satellites, left-handed circularly polarized reflected signals and right-handed circularly polarized reflected signals are received and processed through a power amplifier, a band-pass filter, a down converter and a digital-to-analog converter, and whether targets appear or not is judged by utilizing electromagnetic wave scattering characteristics of aerial targets, so that passive positioning of the aerial targets is realized. The method can receive and process the direct signals of the GNSS satellites and the GNSS satellite signals reflected by the aerial targets, and detect and position the aerial targets.
The specific working process of the device provided by the embodiment is as follows:
when an air target passes through a monitoring area, a part of GNSS satellite signals are radiated by two forms of left rotation and right rotation after being absorbed by the air target, the left rotation signals reflected by the target are received by utilizing a left rotation circular polarization antenna, the right rotation signals reflected by the target are received by utilizing a right rotation circular polarization antenna, the signals are subjected to power amplification, band-pass filtering, down-conversion and sampling quantization, then the data processing and analysis are carried out by a target signal detection module, the time delay and Doppler parameters of the signals are estimated, whether the target appears is judged, and if the echo signals of the target are detected, the three-dimensional coordinates of the air target are calculated by a target positioning module according to the time delay and Doppler information, so that the detection and the positioning of the air target are realized.
The invention has the advantages that:
the device uses GNSS satellites as external radiation sources, and can realize all-day, all-weather and full-coverage airspace detection.
The device is always in an electromagnetic silence state in the running process, has strong survivability in a battlefield environment, and is difficult to discover and destroy.
The device utilizes all satellites visible above the monitoring station, can invert the position of the target in the three-dimensional space, and effectively makes up the defect of the forward scattering detection device.
The device carries out fusion detection on the reflected signals of the left-hand circular polarization mode and the right-hand circular polarization mode, fully utilizes electromagnetic resources in space, and improves detection probability and detection precision compared with the detection mode of single polarization.
The device has simple structure, small volume, light weight and low cost, and can be deployed on a fixed platform such as a monitoring station and a mobile platform such as an airplane, a ship, an automobile and the like.
The invention also provides a full-polarization aerial target detection method based on the GNSS external radiation source, which is applied to the full-polarization aerial target detection device based on the GNSS external radiation source, and comprises the following steps:
the method comprises the steps of obtaining direct signals of GNSS satellites in direct radiation, left-handed reflection signals of GNSS satellites reflected by aerial targets and right-handed reflection signals of GNSS satellites reflected by aerial targets.
And detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. A full polarization airborne object detection device based on an external GNSS radiation source, comprising: an omni-directional antenna, a left-handed circularly polarized antenna, a right-handed circularly polarized antenna and a positioning system;
the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna are all connected with the positioning system;
the omnidirectional antenna is used for receiving direct signals directly emitted by the GNSS satellite; the left-hand circularly polarized antenna is used for receiving left-hand reflected signals of GNSS satellites reflected by an aerial target; the right-hand circularly polarized antenna is used for receiving right-hand reflected signals of GNSS satellites reflected by an aerial target; the positioning system is used for detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal.
2. The apparatus of claim 1, wherein the positioning system comprises a target signal detection module and a target positioning module coupled to the target signal detection module;
the target signal detection module is used for carrying out target detection according to the direct signal, the left-handed reflection signal and the right-handed reflection signal, and determining whether an aerial target exists or not; when the target signal detection module detects that an aerial target exists, the target positioning module performs aerial target positioning according to the output of the target signal detection module.
3. The full-polarization aerial target detection device based on the GNSS external radiation source according to claim 2, wherein the target signal detection module specifically comprises a related processing sub-module, a polarization fusion sub-module, a threshold detection sub-module and a parameter estimation sub-module which are connected in sequence;
the correlation processing sub-module is used for performing correlation processing on the direct signal and the left-hand reflection signal to obtain a time delay-Doppler two-dimensional image of the left-hand circularly polarized channel; the method is also used for carrying out correlation processing on the direct signal and the right-hand reflected signal to obtain a time delay-Doppler two-dimensional image of the right-hand circularly polarized channel;
the polarization fusion submodule is used for carrying out polarization fusion on the time delay-Doppler two-dimensional image of the left-hand circular polarization channel and the time delay-Doppler two-dimensional image of the right-hand circular polarization channel to obtain a fused time delay-Doppler two-dimensional image;
the threshold detection submodule is used for carrying out constant false alarm detection on the fused delay-Doppler two-dimensional image and determining whether an air target exists or not;
and the parameter estimation submodule is used for determining a time delay estimation value according to the fused time delay-Doppler two-dimensional image when the aerial target exists and sending the time delay estimation value to the target positioning module.
4. The GNSS external radiation source based all-polarized airborne object detection apparatus of claim 2 wherein said positioning system further includes a noise amplification module;
the noise amplification module is respectively connected with the omnidirectional antenna, the left-hand circularly polarized antenna and the right-hand circularly polarized antenna; the noise amplification module is also connected with the target signal detection module; the noise amplification module is used for amplifying the power of the voltage signals converted from the direct signal, the left-handed reflection signal and the right-handed reflection signal.
5. The GNSS external radiation source based all-polarized airborne object detection apparatus of claim 4 wherein said positioning system further includes a band pass filter module;
the noise amplification module is connected with the target signal detection module through the band-pass filter module; the band-pass filter module is used for filtering noise parts in the voltage signals subjected to power amplification.
6. The GNSS external radiation source based fully polarized airborne object detection apparatus of claim 5 wherein said positioning system further includes a down conversion module;
the band-pass filter module is connected with the target signal detection module through the down-conversion module; the down-conversion module is used for performing frequency conversion on the voltage signal subjected to noise filtering.
7. The GNSS external radiation source based fully polarized airborne object detection apparatus of claim 6 wherein said positioning system further comprises an acquisition card;
the down-conversion module is connected with the target signal detection module through the acquisition card; the acquisition card is used for sampling and quantizing the frequency-converted voltage signals.
8. The device of claim 3, wherein the object positioning module comprises a space ellipsoidal equation construction sub-module, an equation set construction sub-module and a solution sub-module which are connected in sequence;
the space ellipsoidal equation construction submodule is connected with the parameter estimation submodule; the space ellipsoidal equation construction submodule is used for constructing a space ellipsoidal equation according to the time delay estimated value;
the equation set construction submodule is used for constructing an equation set according to a plurality of space ellipsoidal equations;
and the solving sub-module is used for solving the equation set to obtain the position of the aerial target.
9. The method for detecting the full-polarized aerial target based on the GNSS external radiation source is characterized in that the method for detecting the full-polarized aerial target based on the GNSS external radiation source is applied to the full-polarized aerial target detection device based on the GNSS external radiation source according to any one of claims 1 to 8, and the method for detecting the full-polarized aerial target based on the GNSS external radiation source comprises the following steps:
acquiring direct signals of GNSS satellites in direct incidence, left-handed reflection signals of GNSS satellites reflected by aerial targets and right-handed reflection signals of GNSS satellites reflected by aerial targets;
and detecting and positioning an aerial target according to the direct signal, the left-handed reflection signal and the right-handed reflection signal.
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