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Multistation radar asynchronous multiframe joint detection method

A multi-frame joint detection and radar technology, applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve problems such as low signal-to-noise ratio, failure to meet system detection requirements, weak echo, etc. Achieve reliable detection results, improve detection performance, and ensure real-time effects

Active Publication Date: 2016-10-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The signal-to-noise ratio of these targets is low and the echo is weak, resulting in the detection performance and power range of the cooperative detection system being greatly reduced
The cooperative detection method using single frame data detection can no longer meet the system's detection requirements for such targets
In addition, since the initial scanning time, scanning cycle, and scanning range of different radar nodes in the radar network are different, the fusion center receives a series of asynchronous data, and the traditional multi-frame detection method is not applicable.

Method used

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  • Multistation radar asynchronous multiframe joint detection method
  • Multistation radar asynchronous multiframe joint detection method
  • Multistation radar asynchronous multiframe joint detection method

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Embodiment Construction

[0038] The present invention mainly adopts the method of computer simulation for verification, and all steps and conclusions are verified and confirmed on MATLAB-R2012b. The specific implementation steps are as follows:

[0039] Step 1) Initialize system parameters:

[0040] In this example: the number of radar nodes M = 3, the radar transmission waveform is a simple pulse train, namely Carrier frequency f c =10 9 , the echo signal sampling interval is equal to the pulse repetition frequency, ie T s =T p =10 -3 , the number of samples N=10, the number of data frames transmitted by each radar node to the fusion center K=3, and the corresponding detection threshold V T It is 82.92 obtained by Monte Carlo simulation. Initialize system variables: i=1.

[0041] Step 2) Send the echo signals received by each radar node at K scanning times to the fusion center.

[0042] Step 3) Time Calibration:

[0043] In the fusion center, the echo signals of different scanning moments ...

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Abstract

The invention discloses a multistation radar asynchronous multiframe joint detection method, and belongs to the field of radar target detection. The method comprises the steps that the joint generalized log-likelihood ratio is calculated through multiframe asynchronous echo data provided by multiple radar stations in a radar network at each moment, and then a group of state sequences enabling the joint likelihood ratio to be maximum are found by solving an optimization problem to serve as estimation on target track. In addition, by combining a viterbi algorithm, the optimization problem can be quickly and efficiently solved, the detection real-time performance of the algorithm is guaranteed, and the dim target detection probability of a system and the detection performance of the radar system are improved.

Description

technical field [0001] The invention belongs to the field of radar target detection. Background technique [0002] The monostatic radar system only uses a single radar to scan the surveillance area, and the sampling data obtained is single. In the case of strong clutter and target fluctuations, the detection probability of the target is low. However, multi-station cooperative detection jointly processes the information provided by multiple radar nodes. Due to the use of higher data dimensions, the system can capture target RCS diversity and frequency shift diversity, thereby improving the detection performance of the radar system and providing more reliable Test results. [0003] But with the continuous development of electronic technology, more and more stealth targets gradually appear. The signal-to-noise ratio of these targets is low and the echo is weak, which leads to a great decline in the detection performance and power range of the cooperative detection system. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S7/42
CPCG01S7/42G01S13/88
Inventor 易伟王经鹤李溯琪姜萌方梓成孔令讲崔国龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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