Method for designing loop-optimization-based emission beam matrix in FDA-MIMO radar

Abstract

The invention provides a method for designing a loop-optimization-based emission beam matrix in a FDA-MIMO radar. The method is characterized in that the feature that when a small frequency increment is added to a frequency control matrix through adjacent matrix elements, emission beams with angles and distance dependence can be produced, and possibility is provided for the angle and distance parameter combined positioning of a target is utilized to combine with the frequency control matrix and an MIMO radar, and combined estimation of the distances and angles of multiple targets is achieved by optimally designing the emission beam matrix. The method specifically includes: determining emission carrier waves, the frequency increment and emission receiving antenna number according to actual needs and the features of a frequency control matrix MIMO radar system, and building a frequency control matrix MIMO radar system model; using a loop optimization method to design the emission beam matrix of the radar; verifying the performance of estimated distances, angles and amplitudes on the basis of the emission beam matrix. The method is essentially a method minimizing the mutual coherence principle of a perception matrix in a thinning model to increase distance and angle-dimension resolution.

Description

technical field [0001] The invention belongs to the technical field of radar communication, and relates to a waveform design method in a multi-input multi-output radar of a new system, in particular to a design method of a transmit beam matrix based on cycle optimization in an FDA-MIMO radar. Background technique [0002] There is a small frequency increment between adjacent array elements in a frequency diverse array (FDA), which makes the beam scanning angle of the frequency diverse array beamformer change with distance. The angle and distance dependence of the frequency steered array radar beam provides the possibility for the joint positioning of the target's range and angle parameters. Although the transmitting beam of the frequency steerable array is related to the azimuth and distance of the target, its energy radiation has a unique "S" shape, which makes the beamforming of the frequency steerable array have coupling problems in the direction of distance and azimuth. ...

AI Technical Summary

Problems solved by technology

[0004] However, in the above frequency-steered-array MIMO radar system, obtaining high-resolution estimation requires more transmitted waveforms and snapshots, resulting in higher signal processing complexity

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