Space time coding array spatial smoothing decoherence spectrum estimation method

Abstract

The invention discloses a space time coding array spatial smoothing decoherence spectrum estimation method. The problems in the prior art of large computation and complex calculation can be solved. The technical scheme includes the following steps: 1, obtaining a space time coding array transmitting signal; 2, receiving an echo signal by using a single antenna according to the transmitting signal;3, designing a matched filter, and using the matched filter to perform ith matched filtering on the echo signal so that N matched filtering can be obtained; 4, designing a conversion matrix, obtaining a data matrix by performing inverse transformation on the matched filtered data from beamspace to array space, and performing dimension reduction processing on the data matrix; and 5, performing spatial smoothing algorithm decoherence on the dimension-reduced data, and estimating a target angle by using a spatial smoothing covariance matrix. A transmitting terminal has an omnidirectional angle measurement capability, the transmitting freedom can be effectively utilized by matched filtering at a receiving terminal, and therefore, the complexity of a system can be reduced, parameter estimationperformance can be enhanced, and the method can be used for performing spatial spectrum estimation on 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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