DOA estimation method of airborne MIMO radar in multipath environment

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...

AI Technical Summary

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.

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