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Coherent processing method for multi-channel external radiation source radar

A technology of external radiation source radar and processing method, which is applied in the field of coherent processing of multi-channel external radiation source radar based on multi-channel DVB-S signals, and can solve the problem of limited detection performance of operating distance, positioning accuracy, and limited power of a single radiation source And other issues

Inactive Publication Date: 2018-11-27
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of limited operating range, positioning accuracy and detection performance due to the limited power of a single irradiation source, and researches a multi-channel external radiation source radar coherent processing technology based on multiple TV satellite signal transponder signals , proposed the principle and method of coherent synthesis of DVB-S signals based on multiple TV satellite transponders

Method used

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  • Coherent processing method for multi-channel external radiation source radar
  • Coherent processing method for multi-channel external radiation source radar
  • Coherent processing method for multi-channel external radiation source radar

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Embodiment

[0101] The purpose of this embodiment is to coherently fuse multiple signals to improve the signal-to-noise ratio of target detection for external radiation source positioning. figure 1 It is a flow chart of a specific embodiment of weak target location of external radiation sources based on multi-signal fusion in the present invention. Such as figure 1 As shown, this example includes the following steps:

[0102] Step 1: Assume that the flight target is located at the spatial position O. This implementation is that O is located at a distance of 600m from the receiving station, and it flies at a constant speed v in the horizontal direction. The delay change rate a is implemented this time. τ =2.5×10 -5 .

[0103] According to the above assumptions, the initial relative time delay τ can be obtained 0 = 2μs.

[0104] Step 2: assume that the satellite adopts N transponders to transmit N satellite TV signals, this implementation is N=5, and the transmission signal of the i tran...

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Abstract

The invention belongs to the technical field of external radiation source radar positioning, and relates to a coherent processing method for a multi-channel external radiation source radar. Accordingto the method for positioning a weak target of an external radiation source on the basis of multi-signal fusion, a received multi-channel echo signal and a direct wave signal are subjected to FDPC processing to complete frequency domain pulse compression; Keystone transformation is performed on a slow time dimension to eliminate range migration; non-coherent combination is realized by compensatingthe frequency difference phase between the signals, remaining compensation items are constructed for feedback through non-coherent combination output, and coherent combination of multi-channel outputis realized, so that the amplitude of output signals can be improved by N times. When each channel has the same transmission power, and the output signal-to-noise ratio can be approximately increasedby 10lgNdB; computer simulations show that the system performance can be improved remarkably, and the target detection signal-to-noise ratio can be increased effectively.

Description

technical field [0001] The invention belongs to the technical field of external radiation source radar positioning, and relates to a coherent processing method for multi-channel external radiation source radar, and more specifically relates to multi-channel external radiation source radar coherence based on multi-channel DVB-S signals Approach. Background technique [0002] External radiation source radar, 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 radiation source. It has the ability to resist low-altitude penetration and survive And anti-stealth and other advantages, is one of the hotspots of current domestic research. 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 ...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/418
Inventor 张花国刘莹尤少钦曾辉甘露马俊虎
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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