Angular Doppler Frequency Estimation Method for Uniform Circular Array Bistatic Mimo Radar

Abstract

The invention discloses a bistatic MIMO radar uniform circular array angle and Doppler frequency estimation method. The method is mainly characterized by configuring a transmitter of a bistatic MIMO radar into a uniform circular array having M array elements and configuring a receiver thereof into a uniform circular array having N array elements respectively; enabling the M array elements in the transmitter to emit orthogonal signals and the N array elements in the receiver to receive the orthogonal signals emitted by the M array elements in the transmitter, and carrying out matched filtering to obtain radar echo signals after matched filtering and an NM*L-dimension matrix obtained through L times of snapshot accumulation, and furthermore, obtaining an M*L-dimension slice matrix form of any reception array element in the NM*L-dimension matrix; then, obtaining a transmitting direction estimation matrix, a receiving direction estimation matrix and a normalized Doppler frequency direction estimation matrix by utilizing a parallel factor algorithm; and finally, carrying out estimation by utilizing a least square algorithm to obtain azimuth angles and pitch angles of a radar target with respect to the transmitter and the receiver respectively, and the normalized Doppler frequency estimated value of the radar target.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a bistatic MIMO radar uniform circular array angle Doppler frequency estimation method, which realizes the parameter estimation of the azimuth angle and elevation angle of the radar target relative to the transmitter and the receiver, and radar Accurate estimation of target normalized Doppler frequency. Background technique [0002] The traditional bistatic radar uses the angle and distance of the radar target relative to the receiver to locate the radar target. Because the receiver and the transmitter of the traditional bistatic radar are difficult to meet the precise time synchronization, and its angular resolution and ranging The accuracy is relatively low, resulting in low accuracy of radar target positioning. The bistatic radar using MIMO technology, that is, the bistatic MIMO radar, can obtain the angle information of the transmitter in the rece...

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Problems solved by technology

[0003] The patented technology "bistatic multi-input multi-output radar multi-target positioning method" applied by Harbin Engineering University (application number 201110001351.0, publication number CN 102135617 A) discloses a bistatic multi-input multi-output radar multi-target positioning method. Although the position of the radar target can be obtained by using the ESPRIT algorithm, because the receiver and the transmitter are both uniform linear arrays, only two angles of the radar target relative to the receiver and the transmitter can be obtained at the receiving end. The target is uniquely determined by the three-dimensional coordinates, so this method cannot estimate the azimuth and elevation angle parameters of the space radar target

[0004] The patented technology "Multiple-input and multiple-output radar system target positioning method" (application number 200810150754.X, publication number CN 101349748A) applied by Xidian University discloses a method for multiple-input multiple-output MIMO radar target positioning. It can realize the precise positioning of the radar target, but it can only determine the two-dimensional coordinates of the radar target position, and cannot estimate the azimuth and elevation angle parameters of the space radar target

[0005] The patented technology "Bistatic meter-wave radar target three-dimensional precise positioning method" (patent application number: 201218001807.9) applied by Xidian University discloses a multi-target three-dimensional positioning method for bistatic multi-input and multi-output radar. This method uses ESPRIT The method estimates the receiving angle of the radar target relative to the uniform linear array, and uses the pattern excitation method to estimate the azimuth and elevation angles of the radar target relative to the uniform circular array, but this method cannot achieve simultaneous estimation of the normalized Doppler frequency. It is also impossible to track radar targets

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