Spatial smoothing decoherence spectrum estimation method for space-time coded arrays

Abstract

The invention discloses a space-time encoding array space smoothing decoherence spectrum estimation method, which mainly solves the problems of large calculation amount and complex calculation in the prior art. The scheme is: 1. Obtain the transmitted signal of the space-time coding array; 2. Obtain the echo signal received by a single antenna according to the transmitted signal; 3. Design a matched filter, and use the matched filter to perform the i-th matched filter on the echo signal , to obtain N-way matched filtering; 4. Design the transformation matrix, inversely transform the data after the matched filtering from the beam domain to the array element domain to obtain a data matrix, and perform dimensionality reduction processing on the data matrix; 5. Perform dimensionality reduction on the data matrix Carry out spatial smoothing algorithm to decoherence, and then use spatial smoothing covariance matrix to estimate the target angle. The transmitting end of the present invention has omnidirectional angle measurement capability, effectively utilizes the transmitting degree of freedom through matched filtering at the receiving end, reduces system complexity, improves parameter estimation performance, and can be used for spatial spectrum estimation of multiple coherent targets.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a space-time coding array space smoothing decoherence spectrum estimation method, which can perform space spectrum estimation on multiple coherent targets. Background technique [0002] The traditional phased array radar controls the beam pointing through electronic scanning to perform beam scanning, and can only form a fixed narrow beam at the same time, pointing to a small angle range. Multiple-input multiple-output MIMO radar can form multiple beams at the same time by using the transmit degrees of freedom. However, the transmit waveforms of each array element of MIMO radar are required to be completely orthogonal, which is difficult to achieve in actual situations. [0003] The concept of space-time coding was proposed by F. Le Chevalier et al. at the 2013 IET International Radar Conference. It has flexible beam steering capabilities and has attracted extensiv...

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Problems solved by technology

[0004] There are many existing spatial smoothing decoherence algorithms for coherent signals. For example, a master's thesis in the University of Electronic Science and Technology of China, titled Research on Fast Direction Finding Technology Based on Spatial Spectrum Estimation, proposed a beam zero-limited DOA estimation algorithm to solve ordinary spatial spectrum It is estimated that the calculation problem cannot be solved quickly, but the algorithm still has a large amount of calculation and the calculation is complicated, and its spatial spectrum estimation performance is not significantly improved compared with ordinary spatial spectrum estimation.

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