A Method of Locating Weak Targets of External Radiation Sources Based on Signal Fusion

A technology of external radiation source and weak target, which is applied in the field of weak target positioning of external radiation source based on multi-signal fusion, can solve the problems of limited power of single irradiation source, limited working distance, positioning accuracy and detection performance, and achieve improved detection performance, the effect of increasing signal power

Active Publication Date: 2022-07-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of limited operating distance, positioning accuracy and detection performance due to the limited power of a single irradiation source, and researches the method of multi-signal fusion external radiation source weak target positioning based on RFT transformation to realize multi-signal fusion A method to realize the localization of external radiation source

Method used

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  • A Method of Locating Weak Targets of External Radiation Sources Based on Signal Fusion
  • A Method of Locating Weak Targets of External Radiation Sources Based on Signal Fusion
  • A Method of Locating Weak Targets of External Radiation Sources Based on Signal Fusion

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Embodiment

[0100] In this embodiment, the target is detected when the signal-to-noise ratio of the received target signal is SNR=-56dB.

[0101] The method of the embodiment is attached Figure 4 shown, the radar system is attached figure 1 The shown is composed of a main antenna and a monitoring antenna, the monitoring antenna receives the direct wave of the signal source, and the main antenna receives the target echo.

[0102] Considering that the signal source uses a satellite TV signal (DVB-S signal), the symbol rate R s = 27.5MHz, five-way QPSK signal carrier frequency f ck = [500, 540, 580, 620, 660] MHz, receiver sampling rate f s =55MHz, the accumulation time is T=100ms.

[0103] Suppose the target is about d away from the receiving station act =2.181km, the corresponding echo delay is about τ 0 = 7.27μs, the target flies horizontally to the receiving station at a constant speed, taking the first signal as a reference, design Δa τ =2×10 -8 . The time delay change rate a ...

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Abstract

The invention belongs to the technical field of radar positioning of external radiation sources, and relates to a method for locating weak targets of external radiation sources based on multi-signal fusion. In the invention, the received multi-channel echo signal and direct wave signal are processed by FDPC to complete the frequency domain pulse compression; then the RFT algorithm is used to eliminate the distance migration; finally, the signals of each channel are non-coherently accumulated to determine whether the peak point is out or not. crossed the threshold. Computer simulation shows that the invention can increase the accumulation gain by about 1.7dB compared with the accumulation effect of single-channel signal RFT, which can improve the system performance and effectively improve the target detection signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of radar positioning of external radiation sources, and relates to a method for locating weak targets of external radiation sources based on multi-signal fusion. Background technique [0002] External radiation source radar ( figure 1 ), also known as passive radar, is a passive radar system that does not emit electromagnetic wave signals by itself, but uses existing radio, television, base station and other signals as the source of illumination, with anti-low-altitude penetration, strong survivability and anti-stealth. It is one of the hotspots of domestic research at present. Existing external radiation source radar systems mostly use single illumination source signals, and the available signal power is limited, and the operating distance, positioning accuracy and detection performance are all limited. Therefore, expanding the number of radiation sources and increasing the available signal power to impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/56G01S7/41
CPCG01S7/415G01S7/418G01S13/006G01S13/56
Inventor 张花国刘莹谢进文尤少钦甘露马俊虎
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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