DOA estimation method of airborne MIMO radar in multipath environment

A DOA and radar technology, applied in the DOA estimation field of airborne MIMO radar in multipath environment, can solve the problems of reducing the estimation accuracy of airborne MIMO radar, and it is difficult to accurately estimate the multipath reflection coefficient of airborne MIMO radar. The effect of improving DOA estimates

Active Publication Date: 2021-06-18
XIDIAN UNIV
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Problems solved by technology

Coupled with the complex multipath signal of the airborne MIMO radar, it is difficult to accurately estimate the multipath reflection coefficient of the airborne MIMO radar, which further reduces the estimation accuracy of the airborne MIMO radar when performing DOA estimation.

Method used

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  • DOA estimation method of airborne MIMO radar in multipath environment
  • DOA estimation method of airborne MIMO radar in multipath environment
  • DOA estimation method of airborne MIMO radar in multipath environment

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Embodiment 1

[0068] See figure 1 , figure 1 It is a schematic flowchart of a method for estimating DOA of an airborne MIMO radar in a multipath environment provided by an embodiment of the present invention. This embodiment provides a DOA estimation method of an airborne MIMO radar in a multipath environment, the DOA estimation method of the airborne MIMO radar in a multipath environment includes steps 1-step 9, wherein:

[0069] Step 1. Obtain the direct echo power P according to the parameters of the airborne MIMO radar d , one-way multipath echo power P i1 and the two-way multipath echo power P i2 .

[0070] Specifically, when only specular reflection is considered, the echo signal of the airborne MIMO radar corresponds to three range gates, which are the direct signal, the one-way multipath signal and the two-way multipath signal, figure 2 are their corresponding signal models.

[0071] In the airborne MIMO radar, according to the geometric relationship of the airborne radar, it...

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Abstract

The invention discloses a DOA estimation method of an airborne MIMO radar in a multipath environment, and the method comprises the steps: setting parameters of the airborne MIMO radar, calculating an included angle between a direct echo and a multipath echo of the airborne MIMO radar in the multipath environment at a target, and analyzing the multipath reflection coefficient characteristics of the airborne MIMO radar; acquiring echo data and noise power of the radar in a rest period; estimating a one-way multi-path echo distance unit and a multi-path echo distance unit of a direct signal through elevation angle wave position information of the system; respectively measuring angles of echo data of different distance units by using a digital beam forming method; and processing the angle value processed by the direct data, the one-way multi-path data and the two-way multi-path data by using an optimal fusion method to obtain an optimal angle estimation value. According to the DOA estimation method disclosed by the invention, the DOA estimation value of the airborne MIMO radar in the multipath environment is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of airborne radar signal processing, and in particular relates to a DOA estimation method of an airborne MIMO radar in a multipath environment. Background technique [0002] Radar parameter estimation is the focus and difficulty of radar signal processing. In addition to estimating information such as the Doppler frequency of the target, another key area of ​​parameter estimation is the estimation of the direction of arrival (DOA, Direction of Arrival). The performance of DOA estimation directly affects the radar's ability to detect the target. At the same time, different radar systems can also lead to differences in the information that needs to be estimated. [0003] The MIMO (Multiple input multiple output, multiple input multiple output) system is a new system technology developed in recent years, and has been widely used in the communication field. In the field of radar, the MIMO system can be combine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S7/41
CPCG01S3/143G01S7/411
Inventor 赵永波胡毅立陈胜刘宏伟水鹏朗
Owner XIDIAN UNIV
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