An Improved Method for Estimating High-Resolution Spatial Spectrum of MIMO Arrays

Abstract

The present invention provides an improved MIMO array high-resolution spatial spectrum estimation method. In order to overcome the lack of detection capability of the existing MIMO array high-resolution spatial spectrum estimation method based on transmit diversity smoothing in multi-target and low signal-to-noise ratio environments, According to the de-coherence effect of transmit diversity smoothing characteristics, a uniform transmitting linear array and a uniform receiving linear array are designed, and matched filtering and time-domain truncation are performed to improve the signal-to-noise ratio when processing echoes. At the same time, the designed transmitting and receiving linear arrays are combined Subarray smoothing is performed on the element spacing relationship to increase the degree of freedom, so that the detection performance is better than the existing transmission diversity smoothing MIMO array high-resolution spatial spectrum estimation method in the environment of multi-target and low signal-to-noise ratio.

Description

technical field [0001] The invention relates to an array signal processing method. Background technique [0002] The high-resolution spatial spectrum estimation method of the active array system is of great significance to multi-target detection (Stoica P, Moses R L. Spectral analysis of signals[M]. Upper Saddle River, NJ: PearsonPrentice Hall, 2005.). Since the traditional active array system uses a single waveform, there is a high correlation between the multi-target echoes. Therefore, when using high-resolution spatial spectrum estimation, it is necessary to perform sub-array smoothing decoherence processing on the multi-target echoes on the receiving array. However, when the number of targets is large and the receiving aperture of the active array is small, it is necessary to divide more sub-arrays to obtain the desired decoherence effect, which will lose the receiving aperture, resulting in insufficient multi-target detection capability. [0003] In view of the shortco...

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Problems solved by technology

[0004] However, when the number of targets is large, the number of transmitting elements of the MIMO array is smaller than the number of targets, and the high-resolution spatial spectrum estimation method of the transmit diversity smooth MIMO array faces the problem of insufficient degrees of freedom

In addition, when the target distance is far away, the signal-to-noise ratio of the echo is low, and the performance of the high-resolution spatial spectrum estimation method using the MIMO array will be severely degraded

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