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Method for positioning external radiation source weak target based on multi-signal fusion

A technology of external radiation source and weak target, applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve the problems of limited power of single irradiation source, limited working distance, positioning accuracy and detection performance

Active Publication Date: 2018-12-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • 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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  • Method for positioning external radiation source weak target based on multi-signal fusion
  • Method for positioning external radiation source weak target based on multi-signal fusion
  • Method for positioning external radiation source weak target based on multi-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 embodiment is attached Figure 4 As shown, the radar system is attached as figure 1 The one 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] Consider that the signal source uses satellite TV signal (DVB-S signal), 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 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 △a τ =2×10 -8 . The target movement corresponds to the delay ...

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Abstract

The invention belongs to the technical field of external radiation source radar positioning, and relates to a method for positioning an external radiation source weak target based on multi-signal fusion. According to the invention, received multi-channel echo signals and direct wave signals are subjected to FDPC process to complete frequency domain pulse compression; then the range migration is eliminated through an RFT algorithm; and finally non-coherent accumulation is performed on the channel signals to judge whether a peak point exceeds the threshold or not. Computer simulation shows thataccumulation effect comparison is performed on the method and a method of carrying out RFT by a single-channel signal, the simulation result shows that the method can increase the accumulation gain byabout 1.7dB, the system performance can be improved, and the target detection signal-to-noise ratio can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of external radiation source radar positioning, 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 illumination sources, and has 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-irradiation 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 improve the de...

Claims

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Application Information

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Patent Type & Authority Applications(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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