CN107436427B - Spatial target motion track and radiation signal correlation method - Google Patents
Spatial target motion track and radiation signal correlation method Download PDFInfo
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- CN107436427B CN107436427B CN201710022577.6A CN201710022577A CN107436427B CN 107436427 B CN107436427 B CN 107436427B CN 201710022577 A CN201710022577 A CN 201710022577A CN 107436427 B CN107436427 B CN 107436427B
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The invention discloses a method for correlating a motion track of a space target with a radiation signal, and aims to provide a correlation method which can simplify detection equipment, and has the advantages of small correlation error, high stability and less resource consumption. The invention is realized by the following technical scheme: in a detection platform, an acquisition module carries out AD sampling and digital frequency conversion on a single-path analog signal output by a receiving channel; two paths of digital channelized preprocessing are carried out in the FPGA to output baseband IQ data; comparing the similarity of the space target radiation signal and the relative motion relations of the detection platform and the forecast space target track and the detection platform, calculating a theoretical change rule curve of the target electromagnetic radiation signal frequency by using the original frequency of the target radiation signal, and calculating a theoretical carrier frequency value sequence of the forecast space target and the matching degree of the received signal and the forecast space target; and finishing the association and matching of the target radiation signal and the space target of interest, and finishing the association of the space target motion track and the radiation signal.
Description
Technical Field
The invention relates to a method for observing the operation condition of space targets generating electromagnetic radiation, such as artificial satellites, space stations and the like, comprehensively processing the operation condition, analyzing target information, perfecting space target cataloging information and mastering space situation. More specifically, the method relates to a method for correlating a motion track of a spatial target with a target radiation electromagnetic signal based on signal frequency characteristic measurement for the spatial target radiation electromagnetic signal.
Background
The motion track and the spatial distribution of the target are macroscopic motion characteristics of the target, and have important significance for understanding the behavior of the target. The motion behavior of the target can be accurately and effectively analyzed from the macroscopic aspect through the motion trajectory and the spatial distribution of the target, and whether the target behavior is abnormal or not can be analyzed. In order to acquire the motion trail of the target, the detection and tracking of the moving target need to be realized first. Detection and tracking of moving objects is a complex and difficult problem. Firstly, cover the blind area in addition, secondly ground observation equipment receives weather, atmospheric environment's influence great, and the error of observation takes place easily, and the development of space-based space target monitoring system has then remedied these shortcomings effectively. The space target monitoring satellite is deployed on different orbits, a plurality of satellites are networked, a space-based system and a ground-based space target monitoring system are combined, and the like, so that the observation blind area of the space target is effectively reduced. The space target monitoring system detects all the processes of entering, running and leaving the space of artificial celestial bodies by using space and foundation detection equipment (satellite, photoelectric, radar and the like), and comprehensively processes and analyzes information such as target orbit, function, use and the like by combining information data. To acquire the information of target orbit, function, use, etc., the data and information which belong to the same target and are acquired by devices such as a radio detector, an optical detector, a space-based detector, etc. in the space target monitoring system are associated to complete cataloguing. Since the motion trajectory of the target includes target track information and the target radiation signal includes information about target functions, usage, and the like, associating the motion trajectory of the target with the radiation signal is one of important functions of a spatial target monitoring system.
The main measurement items of radio detection include samples, frequencies, working parameters and the like of target radiation signals. Due to the nature of wave propagation, wireless communication techniques, and the inherent nature of the hardware and software implementation of radios. The radio detection load has a large field of view and a large detection range, and a plurality of space objects with different motion tracks can exist in the radio detection range at a specific detection time, wherein other objects which are not concerned disturb the judgment and extraction of the signals of the space objects of interest, and influence the association and the cataloguing. The traditional method for correlating the target track in the space by means of signal acquisition time information has larger error. In addition, the method for determining the association of the motion track by detecting and tracking the moving target by adopting the multi-channel detectors designed by the multi-detector and array antenna of the distributed networking can reduce errors, but has more complex equipment and large resource consumption.
Disclosure of Invention
Aiming at the special background of the space environment and the defects of various moving target detection and tracking methods, the invention provides the method for associating the motion trail of the space target with the radiation signal, which can simplify the detection equipment, has small association error, high stability and less resource consumption.
The technical scheme adopted by the invention for solving the technical problem is as follows: method for associating space target motion track with radiation signal and deviceThe method has the following technical characteristics: in a detection platform for radio detection of a load, the detection platform adopts a single detection antenna to capture a radiation signal of a space target of interest in a single channel, and the single detection antenna receives an electromagnetic signal radiated by the space target; the detection platform carries out analog frequency conversion, filtering and amplification on the signals through a radio frequency channel and outputs the signals to the acquisition module; the acquisition module carries out AD sampling and digital frequency conversion on the single-path analog signal output by the receiving channel and outputs baseband IQ data to the correlation processing module; the correlation processing module determines the relative motion relationship between the concerned space target radiation signal and the detection platform by combining with the known space position and speed data of the detection platform, acquires the predicted target motion track by combining with the optical detector, compares the similarity of the space target radiation signal and the relative motion relationship between the detection platform and the predicted target motion track acquired by the optical detector, and distinguishes other non-concerned targets; the detection platform automatically forms a frequency change rule curve of a target receiving signal based on multiple frequency measurement of a target radiation signal, combines a forecasted space target motion track, and utilizes the original frequency f of the target radiation signalcCalculating a theoretical change rule curve of the target electromagnetic radiation signal frequency, and then calculating the matching degree J of the interception signal and the forecast space target k based on the similarity of the two rule curvesk(ii) a Then, the matching degrees of the radiation signals and all K possible space targets are sequentially calculated to form a matching degree set { J }kAnd K is 0,1 …, and K-1, searching the corresponding relation with the maximum matching degree in the set, matching the received radiation signal with the space target of interest, identifying the space target with the low earth orbit by using the characteristics of the electromagnetic signal radiated by the moving target, and finishing the association of the motion track of the space target and the radiation signal.
Compared with the prior art, the invention has the following beneficial effects.
The detection system equipment is simplified. Aiming at the requirement that a detection platform in a space target monitoring system needs to correlate the motion track of a target with the parameter information of a signal sample radiated by the target when observing and monitoring the space target, a single detection platform and a single detection antenna receive electromagnetic signals radiated by the space target, a single radio frequency channel carries out analog frequency conversion, filtering and amplification on 1 path of signals and outputs the signals to an acquisition module, and the acquisition module carries out AD sampling and digital frequency conversion on the single path of analog signals output by the receiving channel; the AD sampling data is subjected to digital channelization preprocessing in the FPGA to output baseband IQ data, electromagnetic signals radiated by a target are utilized, the electromagnetic signals are measured and combined with a forecasted space target motion track, the target motion track and the radiation signals are correlated, the correlation of the space target motion track and the radiation signals can be realized by adopting single detection antenna for receiving, direction finding, positioning and tracking of the space target are not needed, array receiving equipment is not needed, multi-station networking detection is not needed, the design of detection system equipment is greatly simplified, the cost is reduced, and the reliability of engineering realization is improved.
The spatial target correlation error is small. The radio detection load of a single detection antenna single channel is adopted to capture the radiation signal of the space target of interest, the relative motion relation between the radiation signal of the space target of interest and the detection platform can be determined by combining the known spatial position and speed data of the detection platform, and the relative motion relation can be reflected on the change relation of the frequency of the target signal captured by the radio detection load of the detection platform. And then, by combining with the forecasted target motion track acquired by the optical detector, the relative motion relationship between the space target and the detection platform can be calculated, the motion relationship can be reflected on a theoretical frequency change relationship calculated according to the original frequency of the target, and other non-concerned targets can be distinguished by comparing the similarity of the two motion relationships. The detection platform forms a frequency change rule curve of a target receiving signal based on multiple frequency measurement of a target radiation signal, combines a predicted space target motion track and three-dimensional position and three-dimensional speed data of the detection platform, and utilizes the original frequency f of the target radiation signalcCalculating a theoretical change rule curve of the target electromagnetic radiation signal frequency, and calculating the matching degree J of the interception signal and the forecast space target k based on the similarity of the two rule curvesk(ii) a Then, the matching degrees { J ] of the radiation signals and all K possible space targets are calculated in sequencekAnd (5) when K is 0,1 …, and K-1, and finding the corresponding relation with the maximum matching degree to complete the association of the motion track and the radiation signal, so as to facilitate the associationThe characteristics of the moving target radiation electromagnetic signal are used for identifying the low earth orbit space target, matching of a space target forecast track and space target signal samples and parameters is achieved, correlation of a target radiation signal and a space target of interest is completed, and the problem that a large error is generated when the space target is correlated by means of signal acquisition time information in the prior art is solved.
High stability and less resource consumption. The method adopts a correlation processing module to combine with the known spatial position and speed data of the detection platform to determine the relative motion relationship between the space target radiation signal concerned and the detection platform, combines with the predicted target motion track obtained by the optical detector, compares the similarity between the space target radiation signal and the two relative motion relationships between the detection platform and the predicted target motion track obtained by the optical detector, and distinguishes other non-concerned targets. Based on multiple frequency measurement of target radiation signals, a frequency change rule curve of target receiving signals is formed, and the target radiation signal original frequency f is utilized by combining the forecasted space target motion track and the three-dimensional position and three-dimensional speed data of the detection platformcCalculating a theoretical change rule curve of the target electromagnetic radiation signal frequency, and calculating the matching degree J of the interception signal and the forecast space target k based on the similarity of the two rule curvesk(ii) a Then, the matching degrees { J ] of the radiation signals and all K possible space targets are calculated in sequencekAnd (5) when K is 0,1 …, K-1, and finding the corresponding relation with the maximum matching degree to complete the association of the motion track and the radiation signal, wherein the traditional complex multi-channel array correction processing, direction-finding processing, positioning and tracking processing are not needed, and the matching and the association of the space target can be completed only by receiving single-channel sampling data and performing frequency-finding and association calculation processing. The method has the characteristics of good engineering applicability, high stability and less resource consumption. The method is applied to a low-orbit space target monitoring satellite platform in an engineering way, and simulation experiments show that the method has good performance and can be popularized and applied to a ground space target monitoring system and a high-orbit space target monitoring system.
Drawings
To further illustrate, but not limit, the above-described implementations of the invention, the following description of preferred embodiments is given in conjunction with the accompanying drawings, so that the details and advantages of the invention will become more apparent.
Fig. 1 is a schematic diagram of a scene in which a motion track of a spatial target is associated with a radiation signal.
Fig. 2 is a schematic circuit diagram of the radio detection load detection platform apparatus of the present invention.
Fig. 3 is a schematic flow chart of the association between the motion trajectory of the spatial target and the radiation signal according to the present invention.
FIG. 4 is a graph illustrating comparative variation of the present invention.
FIG. 5 is a schematic diagram of the correlation of the matching degree calculated according to the comparison variation curve shown in FIG. 4.
Detailed Description
See fig. 1. In the scene that the motion track of the space target is associated with the radiation signal, because the detection platform and the space target move relatively, the Doppler frequency shift effect exists. The detection platform is in the same ground-fixed coordinate system, and the coordinate of the position in the set three-dimensional space is sO＝[x0,yO,zO]TWith a three-dimensional spatial velocity coordinate of vO＝[vxO,vyO,vzO]TThe state quantity of the space target obtained from the motion track of the space target and the three-dimensional space position coordinate of the concerned space target are sB＝[xB,yB,zB]TWith a three-dimensional spatial velocity coordinate of vB＝[vxB,vyB,vzB]T. Target original carrier frequency f in each observationcFrequency f of space target signal received by detection platformmThree-dimensional position s in space target trajectory parametersBThree-dimensional velocity vBThree-dimensional position s of detection platformOThree-dimensional velocity vOThe relationship of (d) may be: frequency f of received signal observed by ith detection platformm i，
Wherein
Wherein c is the speed of light, | is the Euclidean norm of the vector, the superscript i is the ith observation, i ═ 0,1, …, N-1, s0 i、
v0 iPosition and velocity vectors, s, in three-dimensional space for the probing platform at the i-th observationB i、vB iFor the ith observation
A position vector and a velocity vector in the three-dimensional space of the object,ifor the ith measurement of noise, etc., HiFor the ith observation
Doppler frequency calculation matrix, and superscript T is matrix transposition. Expanding the equation (1), multiple observations can be written in matrix form:
in the above matrix, F ═ Fm 0,fm 1,…，fm N-1]TCarrier frequency values for a series of received signals with doppler effect observed N times, H ═ Hm 0,Hm 1,…，Hm N-1]TCalculating a matrix for the Doppler frequency in N observations, E ═ 2 [ ]m 0,m 1,…，N-1]TFor the noise measured in each of the N observations, fm iExpressed as the frequency measurement of the detection platform ith time on the spatial target radiation signal. The doppler shift calculation matrix H at each frequency measurementiComprises the following steps:
the original frequency of the signal can be estimated by using the matrix F and the matrix H, and the original frequency is estimated
Can be as follows:
in the formula, the superscript T is a matrix device. ()-1Is a matrix inversion operation. The formula (4) provides a method for calculating the target original carrier frequency estimation by using the received signal frequency F observed by the detection platform, the target track parameters (three-dimensional position, three-dimensional speed) and the detection platform parameters (three-dimensional position, three-dimensional speed).
Estimation result based on target original carrier frequency
Calculating matrix H by using detection platform and Doppler frequency shift containing forecast space target track informationiThe frequency change sequence F of the theoretical frequency change rule curve of the signal at each observation time of the space target track can be further calculatedeThe method comprises the following steps:
by comparing F with a sequence of frequency variations FeForming a measure of the match or correlation between the signals detected by the detection platform and the predicted spatial target trajectory. The calculation formula of the matching degree of the space target motion track and the radiation signal is as follows:
where J is the degree of match, | is the Euclidean norm of the vector. Setting a total of K space targets, performing the above operation on each space target track to obtain K matching values, which are recorded as { JkK-0, 1, …, K-1. By comparing a plurality of predicted space target motion tracks with the received radiation signals, the pair with the maximum matching degree is searchedAccording to the relation, the correlation between the motion trail of the space target and the radiation signal can be realized based on the signal measurement.
See fig. 2. According to the invention, in a detection platform for radio detection load, the detection platform adopts a single detection antenna to capture a radiation signal of a space target of interest in a single channel, detects the radio load, the single detection antenna receives an electromagnetic signal radiated by the space target, carries out analog frequency conversion, filtering and amplification on the signal through a radio frequency channel, and outputs the signal to an acquisition module, and the acquisition module carries out analog-to-digital (AD) sampling and digital frequency conversion on a single-channel analog signal output by a receiving channel; performing two-path digital channelization preprocessing on the AD sampling data in the FPGA to output baseband IQ data; the correlation processing module determines the relative motion relationship between the space target radiation signal concerned and the detection platform by combining the known spatial position and speed data of the detection platform, compares the similarity between the space target radiation signal and the two relative motion relationships between the detection platform and the target motion trajectory predicted by the optical detector, and distinguishes other non-concerned targets by combining the predicted target motion trajectory acquired by the optical detector and the target motion trajectory predicted by the detection platform. The detection platform automatically forms a frequency change rule curve of a target receiving signal based on multiple frequency measurement of the target radiation signal; combining the predicted space target motion track, and utilizing the original frequency f of the target radiation signalcCalculating a theoretical change rule curve of the frequency of the electromagnetic radiation signal of the space target, and calculating the matching degree J of the interception signal and the forecast space target k based on the similarity of the two rule curvesk(ii) a Then, the matching degrees { J ] of the radiation signals and all K possible space targets are calculated in sequencekAnd (5) 0,1 …, K-1, and finding the corresponding relation with the maximum matching degree to complete the association of the motion track and the radiation signal.
The correlation processing module extracts IQ data at a time interval with a typical value of at least 1s by using IQ data and analog variable frequency parameters of electromagnetic signals radiated by a target according to the principles of continuity and track consistency of target motion, performs continuous multiple signal arrival frequency measurement, performs multiple frequency measurement on signals with Doppler frequency shift change, and analyzes a time-frequency change rule curve of received signals; spatial three-dimensional position of binding targetEstablishing a Doppler frequency shift calculation matrix H for the three-dimensional velocity forecast value, the three-dimensional position and the three-dimensional velocity value of the detection platform, and calculating the original frequency f of the target radiation signalcEstimating, and reusing original frequency f of target radiation signalcCalculating the original emission frequency f of the target k at the electromagnetic radiation signal at a plurality of observation momentscSequence of theoretical frequency changes F under conditionse(k) Obtaining a theoretical time-frequency change rule curve of the target k; and the correlation processing module compares the calculated theoretical change rule curve of the target k with the measured change rule curve, and compares the difference of the two change rule curves, wherein the smaller the difference is, the larger the matching degree is. Forming a measure of the spatial target match or correlation of the detection signals of the detection platform and the forecasts, i.e. the degree of matching of the spatial target kk(ii) a And after the correlation processing module finishes the calculation of the matching degrees of all possible space targets in the detection field, searching the corresponding space target with the maximum matching degree, and finishing the correlation between the motion track and the radiation signal by searching the corresponding relation with the maximum matching degree.
See fig. 3. The method comprises the steps that a detection platform receives signals through a detection antenna, analog frequency conversion, filtering and amplification are carried out on the received electromagnetic signals radiated by a space target through a radio frequency channel, the electromagnetic signals are output to an acquisition module, the acquisition module carries out analog-to-digital (AD) sampling on the analog signals output by the reception channel, AD sampling data are subjected to two-path digital channelization preprocessing and digital down-conversion in a Field Programmable Gate Array (FPGA), and baseband IQ data are output. The correlation processing module utilizes the IQ data signal and the frequency conversion information after the digital down-conversion to perform correlation processing on the signal at the time T0,T1,…,TN-1Carrying out accurate frequency measurement on the arrival frequency of the signals at N moments to obtain a group of frequency measurement results as a change rule curve of the received signals, and taking F as { F ═ Fm iDenotes, where i ═ 0,1,2, …, and N-1 denotes the i-th observation, and N observations were performed in total. Meanwhile, the correlation processing module selects three-dimensional position and three-dimensional speed data of the K-th space target at the N moments from K possible space target tracks, establishes a Doppler frequency shift calculation matrix H according to the formula (2) and the formula (3), and combines a plurality of signal arrival frequency values to detect the platform and the possible targetsk three-dimensional position and three-dimensional speed data, and calculating and forecasting the original frequency estimated value f of the space target k radiation signal by using the formula (4)ce(k) (ii) a Calculating and forecasting space target k radiation signal theoretical frequency change rule curve by using the formula (5), and using carrier frequency value sequence Fe(k) Representing the theoretical time-frequency law curve of the target k.
Secondly, after obtaining the frequency change rule curve of the received signal and the theoretical frequency change rule curve of the radiation signal of the forecast space target k, the detection platform calculates the matching degree J of the forecast space target k and the radiation signal by using the formula (6) according to the similarity of the two change rule curveskAnd calculating the matching degree of all the targets by the same method, counting the matching degrees of all possible K targets, and obtaining a matching degree set { J } of the K targetsk}，k＝0,1,…,K-1。
Thirdly, the detection platform utilizes the signal matching degree set { J ] of all K forecast space targets k0,1,2, … K-1; search set { JkAnd finding a corresponding target track according to the target serial number corresponding to the maximum value in the sequence, and finishing the association of the target track and the signal.
See fig. 4. In the second step, the detection platform extracts IQ data at a time interval of at least 1s with typical value by using IQ data and frequency conversion information of the detection signal, and performs frequency measurement of the arrival frequency of the signal for multiple times to obtain a curve F of the change rule of the received signal; establishing a Doppler frequency shift calculation matrix H by combining the space three-dimensional position and the three-dimensional velocity forecast value of the target and the three-dimensional position and the three-dimensional velocity value of the detection platform to obtain a signal frequency theoretical change rule curve F of a possible target ke(k) In that respect The two change rule curves take a time-frequency relation curve as a curve, the difference degree of the two curves represents the matching degree of the possible space target k and the received electromagnetic signal, and the closer the change trend of the curves is, the higher the matching degree is.
See fig. 5. In the third step of embodiment, the detection platform intercepts 1 space target radiation electromagnetic signal through the radio detection load, 2 space targets exist in the radio detection load visual field, and the electromagnetic signal and the space target radiation electromagnetic signal are required to be combinedAnd (5) associating the 1 target. During processing, the detection platform utilizes the acquired signal at T0,T1,…,TN-1A curve F of the change rule of the received signal at a moment and a curve F of the theoretical change rule of the signal of a possible target 0 and a possible target 1e(0)、Fe(1) And through comparing and calculating the correlation of the change rule curves, when the similarity of the receiving change rule curve of the target 1 and the theoretical change rule curve is higher than the similarity of the change rule curve of the target 0 and the change rule of the target radiation signal theoretical change rule obtained by the target 1 track forecast parameters is close to the change rule of the received signal, judging that the signal is associated with the space target 1 track, and cataloging the intercepted electromagnetic signal and the space target 1 together.
The present invention has been described in detail with reference to the accompanying drawings, but it should be noted that the above examples are only preferred examples of the present invention, and are not intended to limit the present invention, and those skilled in the art will be able to make various modifications and changes, for example, the frequency calculation may be performed by selecting the intermediate frequency sampling data and the matching degree calculation may be performed by selecting the signal arrival amplitude variation law curve in combination with specific engineering projects. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for associating a space target motion track with a radiation signal has the following technical characteristics: in a detection platform for detecting loads by radio, the detection platform adopts a single detection antenna to capture a radiation signal of a space target of interest in a single channel, the single detection antenna receives an electromagnetic signal radiated by the space target, and the electromagnetic signal is subjected to analog frequency conversion, filtering and amplification through a radio frequency channel and is output to an acquisition module; the acquisition module carries out analog-to-digital (AD) sampling and digital frequency conversion on the single-path analog signal output by the receiving channel and outputs baseband IQ data to the correlation processing module; the correlation processing module is combined with known space position and speed data of the detection platform to determine the relative motion relation between the concerned space target radiation signal and the detection platform, and is combined with the optical detector to obtain the predicted target motion track, and the predicted target motion track is comparedSimilarity of the space target radiation signal and relative motion relation of a target motion track obtained and forecasted by a detection platform and an optical detector is used for distinguishing other non-concerned targets; the detection platform automatically forms a frequency change rule curve of a target receiving signal based on multiple frequency measurement of a target radiation signal, combines a forecasted space target motion track, and utilizes the original frequency f of the target radiation signalcGenerating a theoretical change rule curve of the target electromagnetic radiation signal frequency, and calculating the matching degree J of the interception signal and the forecast space target k based on the similarity of the two rule curvesk(ii) a Then, the matching degrees of the radiation signals and all K possible space targets are sequentially calculated to form a matching degree set { J }kAnd K is 0,1 …, and K-1, searching the corresponding relation with the maximum matching degree in the set, matching the received radiation signal with the space target of interest, identifying the space target with the low earth orbit by using the characteristics of the electromagnetic signal radiated by the moving target, and finishing the association of the motion track of the space target and the radiation signal.
2. The method of correlating a spatial target motion trajectory with a radiation signal of claim 1, wherein: the correlation processing module extracts IQ data at a time interval with a typical value of at least 1s by using IQ data and analog frequency conversion parameters of electromagnetic signals radiated by a target according to the principles of continuity and track consistency of target motion, performs continuous multiple signal arrival frequency measurement, performs multiple frequency measurement on signals with Doppler frequency shift change, and analyzes a time-frequency change rule curve of received signals.
3. The method of correlating a spatial target motion trajectory with a radiation signal according to claim 2, wherein: the correlation processing module is used for establishing a Doppler frequency shift calculation matrix H by combining the space three-dimensional position and the three-dimensional velocity forecast value of the target and the three-dimensional position and the three-dimensional velocity value of the detection platform, and calculating the original frequency f of the target radiation signalcEstimating, and reusing original frequency f of target radiation signalcCalculating the original emission frequency f of the target k at the electromagnetic radiation signal at a plurality of observation momentscConditionSequence of theoretical frequency variations Fe(k) And obtaining a theoretical time-frequency change rule curve of the target k.
4. The method of correlating a spatial object motion trajectory with a radiation signal of claim 3, wherein: the correlation processing module compares the generated theoretical change rule curve and the measurement change rule curve of the target k, compares the difference of the two change rule curves, and forms the measurement of the matching or correlation between the detection platform interception signal and the predicted space target, namely the matching degree J of the space target k through the compared differencek。
5. The method of correlating a spatial object motion trajectory with a radiation signal of claim 4, wherein: and after the correlation processing module finishes the calculation of the matching degrees of all possible space targets in the detection field, searching the corresponding space target with the maximum matching degree, and finishing the correlation between the motion track and the radiation signal by searching the corresponding relation with the maximum matching degree.
6. The method of correlating a spatial target motion trajectory with a radiation signal of claim 1, wherein: the correlation processing module utilizes the IQ data signal and the frequency conversion information after the digital down-conversion to perform correlation processing on the signal at the time T0,T1,…,TN-1Carrying out N times of observation and accurate frequency measurement on the arrival frequency of the signals at N times to obtain a group of frequency measurement results as a change rule curve of the received signals, and taking F as { F ═ Fm iWhere N-1 denotes the ith observation, i ═ 0,1,2, ….
7. The method of correlating a spatial target motion trajectory with a radiation signal of claim 1, wherein: the correlation processing module selects three-dimensional position and three-dimensional speed data of a K-th space target at N moments from K possible space target tracks, and calculates a matrix H according to a matrix written by multiple observations and Doppler frequency shift during frequency measurement each timeiAnd establishing a Doppler frequency shift calculation matrix H.
8. The method of correlating a spatial object motion trajectory with a radiation signal of claim 7, wherein: the correlation processing module combines the multiple signal arrival frequency values, detects the three-dimensional position and three-dimensional speed data of the platform and the possible target k, and calculates and forecasts the original frequency estimation value of the space target k radiation signal
9. The method of correlating a spatial object motion trajectory with a radiation signal of claim 8, wherein: the correlation processing module uses the frequency change sequence F of the frequency change rule curveeCalculating and forecasting space target k radiation signal theoretical frequency change rule curve and using carrier frequency value sequence Fe(k) Representing the theoretical time-frequency law curve of the target k.
10. The method of correlating a spatial target motion trajectory with a radiation signal of claim 1, wherein: probing platform using obtained at T0,T1,…,TN-1A curve F of the change rule of the received signal at a moment and a curve F of the theoretical change rule of the signal of a possible target 0 and a possible target 1e(0)、Fe(1) And through comparison and calculation of correlation of the change rule curves, when the similarity of the receiving change rule curve of the target 1 and the theoretical change rule curve is higher than the similarity of the change rule curve of the target 0 and the change rule of the target radiation signal obtained by the target 1 track forecast parameters is close to the change rule of the received signal, the signal is judged to be associated with the space target 1 track, and the intercepted electromagnetic signal is cataloged with the space target 1.
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| CN110441731A (en) * | 2019-07-27 | 2019-11-12 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Narrow band electromagnetic radiation source object localization method |
| CN111444476B (en) * | 2020-03-24 | 2021-12-28 | 中国人民解放军32035部队 | Spatial target track association method |
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| CN114460578B (en) * | 2022-02-11 | 2023-01-10 | 北京博识广联科技有限公司 | Radiation source screening method based on multi-dimensional signals |
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