MIMO radar extended target detection method

A technology for expanding target and detection methods, applied in the field of anti-clutter and target detection, which can solve the problems of complex GLRT method and different characteristics of target and clutter.

Active Publication Date: 2016-07-27
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, under the MIMO radar system, as the number of receiver processing channels increases, the GLRT method becomes more complex, the

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  • MIMO radar extended target detection method

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[0053] This method is suitable for various MIMO radars that use wideband signals. Attached Figure 1-6 As shown, the specific steps and effects of this method will be further explained below. The main steps are:

[0054] Step 1: First set the simulation parameters: MIMO radar transmit signal bandwidth 200MHz; PRF is 500Hz; the number of pulses K is 16; the false alarm probability is Assuming that the target only extends in the azimuth direction, the number of scattering units is 4, and the corresponding scattering coefficient is set to α t =[1.22.33.12.5]; the speed of the target is 25m / s. The signals obtained by the N receiving antennas are down-converted to obtain intermediate frequency signals to prepare for the next step of matched filtering.

[0055] Step 2: Perform matched filtering on the received signal. MIMO radar adopts a multiple-transmit and multiple-receive system, and the transmit signals of each transmit antenna maintain orthogonal characteristics. Therefore, at...

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Abstract

The invention relates to a MIMO radar extended target detection method, and the purpose is that multichannel process advantage of a MIMO radar is utilized, so that extended targets in a compound Gaussian clutter can be preferably detected. The core idea of the method comprises: according to target echo received by the MIMO radar, estimation of target motion parameters and clutter parameters are performed, a GLRT basic principle, test statistics is acquired, and the detection is complete at last. Target Doppler mismatching, compound Gaussian clutter shape parameters and the like can influence detection performance if GLRT, so that an MLE method is adopted, estimated values of the target Doppler and clutter shape parameters are obtained, and the target detection is performed. At last, advantages of MIMO radar multichannel processing are used for realizing accumulation of target echo energy, so that performance of a GLRT detector is greatly improved, and the performance improvement relates to the number of MIMO radar transmitting and receiving antenna.

Description

【Technical field】 [0001] The invention belongs to the traditional radar target detection field, and specifically relates to anti-clutter and target detection technology under the current multi-input multi-output (MIMO) radar system. Furthermore, in compound Gaussian clutter, a detection method for extended targets is proposed for MIMO radars using broadband signals such as chirp. 【Background technique】 [0002] Traditional radar uses a single antenna to transmit and receive signals for target detection; while MIMO radar uses multiple transmit antennas and multiple receive antennas for target detection, so it has good space diversity characteristics and waveform diversity advantages. Generally speaking, MIMO radar can be divided into two types: distributed and centralized. For different configuration methods, narrowband signals are mainly used at present, and the point target detection method under Gaussian clutter is studied. However, when the bandwidth of the MIMO radar t...

Claims

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Application Information

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IPC IPC(8): G01S7/292
CPCG01S7/292
Inventor 赵锋刘进刘晓斌杨建华艾小锋冯德军肖顺平王雪松欧健吴其华王俊杰尹艳娟
Owner NAT UNIV OF DEFENSE TECH
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