Space-time phase decoupling method for time-division mimo radar based on random transmission pulses

Abstract

The present invention proposes a time-division MIMO radar space-time phase decoupling and estimation method based on random transmission pulses, which realizes the separation of spatial frequency and Doppler frequency to better correctly estimate the target angle and velocity. Step 1. Design a random emission measurement matrix, obtain the order of controlling the random switching of the emission array elements through the random emission measurement matrix, and replace the original emission elements with the random emission in the order of periodic pulse emission according to the spatial placement position. Time-division mode; step 2, multiply the random emission measurement matrix by the standard Fourier orthogonal base matrix to obtain the perception matrix, and use the FOCUSS sparse reconstruction method to reconstruct the Doppler frequency spectrum along the distance dimension, so as to realize the speed of the moving target The independent estimation of the independent estimation; Step 3, do the matching filter processing of the angle dimension along each range-Doppler unit, obtain the spatial frequency spectrum of the unit, and then extract the target angle information, and complete the independent estimation of the target angle.

Description

technical field [0001] The invention belongs to the field of multiple-input multiple-output (MIMO) radars, in particular to a space-time phase decoupling method for time-division MIMO radars based on random transmission pulses. Background technique [0002] Compared with traditional phased array radars, MIMO technology has the advantage of improving radar angular resolution while using fewer physical channels. At the same time, from the perspective of low hardware cost, time diversity scheme (TDM) is the easiest MIMO system to implement. Therefore, TDM-MIMO radars have been extensively studied with a large body of literature and engineering implementations. [0003] For radar systems using traditional TDM-MIMO schemes, it is generally considered that each target to be detected remains stationary within a given time; otherwise, motion will introduce a velocity-dependent phase change in the echo signal and couple in The angle-related phase term leads to a sharp decline in ra...

AI Technical Summary

Problems solved by technology

However, this type of method cannot correctly calculate the compensation phase when there is an odd multiple of ambiguity in the target velocity to be estimated, resulting in an error in the decoupling phase, which not only fails to solve the problem but introduces an additional phase term, further resulting in wrong angle estimation

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