L-shaped array two-dimensional DOA estimation method based on single-bit auxiliary mode sampling

Abstract

The invention discloses an L-shaped array two-dimensional DOA (Direction of Arrival) estimation method based on single-bit auxiliary mode sampling, which is characterized by comprising the following steps of: firstly, establishing a signal model, and respectively carrying out 1-bit analog-digital sampling and b-bit analog-digital sampling on an original sample received by a sensor; then, a normalized covariance matrix which is not subjected to quantitative measurement is constructed from the obtained one-bit sample based on the arcsin law; then, an intermediate frequency decoder is used for recovering an original signal; iteratively updating the estimation of the covariance matrix by using the recovered covariance matrix and the measurement value consistent with the one-bit sample; and finally, estimating the direction of arrival by using a subspace algorithm. According to the 1-bit auxiliary blind integer forced decoding method provided by the invention, the problem of near-far effect is well solved, and the inherent defect of low dynamic range of a two-dimensional blind integer forced method is overcome.

Images