Receiving-transmitting type robust dimensionality-reducing self-adaptive beam forming method of coherent MIMO (Multiple Input Multiple Output) radar

Abstract

The invention discloses a receiving-transmitting type robust dimensionality-reducing self-adaptive beam forming method of coherent MIMO (Multiple Input Multiple Output) radar. The receiving-transmitting type robust dimensionality-reducing self-adaptive beam forming method comprises the following steps: firstly, separating a transmitting-receiving two-dimensional weight vector in the coherent MIMO radar into a transmitting weight vector and a receiving weight vector to realize dimensionality reduction; then utilizing a two-order convex optimization algorithm to deduce a double-secondary cost function and a constraint condition based on a bilateral guiding vector error model; calculating an optimal weight vector needed by beam forming by using a double iteration method; and finally, robustly realizing self-adaptive beam forming by using the optimal weight vector. According to the receiving-transmitting type robust dimensionality-reducing self-adaptive beam forming method, the disadvantages that a very great sample quantity and a great calculation quantity are needed when a traditional self-adaptive beam forming method is applied to the coherent MIMO radar are overcome. Compared with the traditional self-adaptive beam forming method, the needed sample quantity and calculation quantity are reduced to the great extent, the convergence speed is improved greatly and the robustness is very good.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, specifically to realize the problem of the mismatch of steering vectors between the sending and receiving sides of the coherent multiple-transmit multiple-receive (hereinafter referred to as MIMO) radar and the robust degradation under the condition that the observation data contains the target signal. dimensional adaptive beamforming for moving target detection and direction of arrival (DOA) estimation. Background technique [0002] In recent years, as a new radar system, multiple-input multiple-output (MIMO) radar has received widespread attention. Compared with traditional phased array radar, MIMO radar transmits incoherent or orthogonal signals through multiple antennas, and performs matched filtering at the receiving end to separate the transmitted signal components, so it can use a small number of antennas to obtain more degrees of freedom in system processing. Realize tran...

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Problems solved by technology

[0004] The purpose of the present invention is to address the shortcomings of existing adaptive beamforming methods when they are applied to coherent MIMO radars, such as high computational complexity, large sample requirements, and the existence of steering vector mismatch and estimated covariance matrix in actual signal processing Containing various non-ideal factors such as target signals, the present invention proposes a robust and dimensionally-reduced adaptive beamforming method for transmitting and receiving to realize robust adaptive beamforming under the condition that the transmitting and receiving bilateral steering vectors do not match and the observation data contains target signals

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