Broadband frequency agility angle super resolution method using prior information

Abstract

The invention discloses a broadband frequency agility angle super resolution method using prior information. The problem that elevation estimation is low in precision in a sea surface multipath environment in the prior art is mainly solved. The implementation steps are as follows: 1) a radar receives echoes of different carrier frequencies and acquires a sample data vector of the different carrier frequencies; 2) the sample data vector is used for calculating a sampling covariance matrix of all frequency points and calculating a multi-frequency combined sampling covariance matrix; 3) a sea surface parameter is used for estimating a sea surface reflection coefficient; 4) an echo path difference corresponding to a search angle is calculated; 5) the reflection coefficient and the path difference are used for acquiring the synthetic steering vector of all the frequency points; 6) the synthetic steering vector is used for constituting a multi-frequency combined projection matrix; and 7) the multi-frequency combined sampling covariance matrix and the multi-frequency combined projection matrix are used for conducting one dimensional search to obtain a target angle. The broadband frequency agility angle super resolution method using the prior information improves the angle resolution power of a radar to low altitude targets, and can be used for estimating the direction of wave arrival in a multipath environment of a shipbased radar.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to a method for super-resolution angle estimation by using multipath model prior information and broadband frequency-agile, which can be used for direction-of-arrival estimation of shipboard broadband radar in a sea surface multipath environment. Background technique [0002] Shipborne radar can be used to detect and track sea and air targets, provide target data for ship weapon systems, and guide weapon systems to attack targets. The problem of finding and stably tracking low-altitude sea-skimming flying targets must be solved to ensure that shipborne weapon systems can be effective. intercept low-altitude and ultra-low-altitude targets. After the radar beam irradiates the sea surface, direct waves and reflected waves that interfere with each other will be generated. At this time, after the target echo enters the radar receiver, it will cause changes in the amplitude and phase of the t...

AI Technical Summary

Problems solved by technology

Because this method only uses the received multi-frequency information, it ignores the use of prior information such as multipath models. Therefore, simple error averaging and re-filtering cannot make the angle measurement results meet the angle measurement accuracy required by shipborne radars. It is difficult to realize accurate discovery and stable tracking of low-altitude sea-skimming flying targets

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