Multichannel target detection method based on channel optimized selection

A target detection and multi-channel technology, which is applied in the field of target detection and multi-channel target detection under the multi-transmission and multi-reception radar system, can solve the problems of target detection performance degradation, achieve unstable detection performance, low complexity, and low implementation cost Effect

Active Publication Date: 2015-09-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At present, in view of this actual situation, there is still no effective and practical solution to solve the problem of target detection performance degradation.

Method used

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  • Multichannel target detection method based on channel optimized selection
  • Multichannel target detection method based on channel optimized selection
  • Multichannel target detection method based on channel optimized selection

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Embodiment Construction

[0022] The present invention mainly adopts the method of computer simulation to verify, and all steps and conclusions are verified correctly on MATLAB-R2010b. The specific implementation steps are as follows:

[0023] Step 1. Matched filtering:

[0024] Let the echo of the lth transmit-receive channel be: l=1,2,...,L

[0025] where gamma l Characterize the impact of the target scattering characteristics from the first transmit-receive channel and the attenuation of the transmission channel on the signal amplitude and phase; τ l The delay of the target in the lth transmit-receive channel; θ l is the random phase of the target in the lth transmit-receive channel; p(t) is the simple square wave signal transmitted (signals transmitted by different transmit antennas are orthogonal to each other); n l (t) is the noise received by the lth transmit-receive channel, when the distributed radar network system is an air early warning radar system, n l (t) is modeled with mean 0 and...

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Abstract

The invention discloses a multichannel target detection method based on channel optimized selection and belongs to the field of target detection, and especially relates to the technical field of multichannel target detection in a multi-transmitter and multi-receiver radar system. The method comprises: designing a multichannel detector structure based on a generalized likelihood ratio (or Rao, Wald) criterion; sorting the detection statistical magnitudes of the channels (from small to large); by using sequential detection idea, circularly determining whether the joint detection statistical magnitudes of the last n channels exceed threshold values until a target is detected. For a conventional distributed radar system, the structure of a detector is not required to be changed. The method is low in realization expense and low in complexity, and may obviously improve an effect of detecting an invisible target.

Description

technical field [0001] The invention belongs to the field of target detection, and in particular relates to the technical field of multi-channel target detection under a multi-transmission and multi-reception radar system. Background technique [0002] The rapid development of stealth technology makes radar detection technology face great challenges. The target stealth design is based on the backscattering detection mechanism of the single-station radar, which can significantly reduce the backscattered energy captured by the single-station radar, so that the power of a single radar drops sharply, "power clearing". The distributed multi-sensor network detection technology can make full use of the spatial multi-node layout form, effectively use the node multi-frequency, multi-polarization and multi-directional scattering energy of the target, and realize the detection of stealth targets in complex environments. Therefore, multi-channel joint target detection technology become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/2927G01S7/354G01S7/41G01S13/003
Inventor 易伟李溯琪杨亚李雪婷孔令讲杨晓波王佰录
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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