Target detection method and device based on external radiation source space-based receiving

A technology of target detection and external radiation source, which is applied in the field of radar detection of external radiation sources, and can solve the problems of weak signal and low detection probability of weak and small moving targets.

Pending Publication Date: 2021-04-20
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]However, although space-based receivers can receive relatively strong reflection signals, for long-distance moving targets moving at high speed, especially for weak and small moving targets, it cannot receive The signal is still relatively weak, which makes the detection probability of weak and small moving targets low

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  • Target detection method and device based on external radiation source space-based receiving
  • Target detection method and device based on external radiation source space-based receiving
  • Target detection method and device based on external radiation source space-based receiving

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Embodiment 1

[0065] See figure 1 , figure 1 It is a schematic flowchart of a target detection method based on space-based reception of an external radiation source provided by an embodiment of the present invention, including the following steps:

[0066] S1: Establish the mathematical model of the external radiation source radar to obtain the target echo signal.

[0067] This embodiment is mainly designed and researched on the target enhancement and detection method based on the navigation satellite as the external radiation source emission-space-based reception. First, the GPS navigation satellite signal is used as the external radiation source to illuminate, and the space-based equipment is used to receive the reflected signal of the moving target, and the mathematical model of speed measurement and ranging under the geometric configuration of single-shot and multiple-shot external radiation sources is derived, and the corresponding receiver is established. Signal Mathematical Model. ...

Embodiment 2

[0149] On the basis of the first embodiment above, this embodiment provides a target detection device based on space-based reception of external radiation sources, please refer to Figure 4 , Figure 4 It is a schematic structural diagram of a target detection device based on space-based reception of an external radiation source provided by an embodiment of the present invention, which includes:

[0150] The model building module 1 is used to set up the mathematical model of the external radiation source radar to obtain the target echo signal;

[0151] A signal capture module 2, configured to perform Doppler compensation and C / A code matching on the target echo signal to obtain a capture signal;

[0152] A three-dimensional compensation module 3, configured to perform three-dimensional compensation on the captured signal to obtain a three-dimensionally compensated echo signal;

[0153] The target detection module 4 is configured to perform CFAR detection on the three-dimensi...

Embodiment 3

[0156] The beneficial effect of the present invention will be verified and illustrated through simulation experiments below.

[0157] (1) Simulation experiment conditions

[0158] The signal parameters set in this experiment are as follows: GPS signal carrier frequency f c =1.575GHz, pulse repetition frequency PRF=1000Hz, signal sampling frequency f s =8MHz, the maximum tangential velocity of the satellite is V s =3900m / s, the moving speed of the target is V t =300m / s, the acceleration of the target is at =20m / s 2 , the moving speed of the receiving device is V r =70m / s, radar bistatic angle β=89.999°, angle δ=34° between target motion direction and bistatic angle bisector, airspace angle 0°-2°, total pulse number M=2000, selected sampling Number of points N=3000, signal-to-noise ratio SNR=-5dB.

[0159] (2) Simulation experiment content and result analysis

[0160] The embodiment of the present invention constructs echo data according to the signal model, and then perf...

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Abstract

The invention discloses a target detection method and device based on external radiation source space-based receiving, and the target detection method comprises the steps of: building a mathematic model of an external radiation source radar so as to obtain a target echo signal; carrying out doppler compensation and C / A code matching on the target echo signal to obtain a capture signal; performing three-dimensional compensation on the captured signal to obtain an echo signal subjected to three-dimensional compensation; and performing CFAR detection on the echo signal subjected to three-dimensional compensation to obtain a target detection result. According to the target detection method based on external radiation source space-based receiving provided by the invention, coherent accumulation of received signals is realized through a three-dimensional compensation method of a weak target, the accumulation time of echo signals is effectively prolonged, the accumulation gain is improved, and the detection probability of the target is improved.

Description

technical field [0001] The invention belongs to the technical field of external radiation source radar detection, and in particular relates to a target detection method and device based on external radiation source space-based reception. Background technique [0002] External radiation source radar is a special dual (multi) base passive radar system, which uses non-cooperative electromagnetic wave signals in the environment to detect targets in space, such as TV broadcast signals, satellite TV signals, navigation satellite signals, etc. Compared with the traditional monostatic radar, the external radiation source radar has the advantages of low cost, strong mobility, good concealment, anti-stealth characteristics, and rich irradiation sources. [0003] The GPS navigation satellite signal itself is used for navigation and positioning. It can be divided into two kinds of spreading codes: C / A code and P code. P code is an encryption code only used by the US military and is diff...

Claims

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Application Information

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IPC IPC(8): G01S13/00G01S7/41
Inventor 陶海红陈维佳赵朗旭汪乐曾操
Owner XIDIAN UNIV
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