The Research And Implementation Of Array Signal Processing Based On The Multi-core DSP

The array signal processing technology as an important part of signal processing, has achieved rapid development in recent years and has a wide range of applications in both military and civil areas. In modern increasingly complex electromagnetic environment, the signal density is higher and higher, and modern radar system usually use multiple interference sources to protect the target radar,which makes the passive radar system face more serious challenges, so it is the focus of the research of direction finding system that the incidence angle on a plurality of radiation signal source can be quickly and effectively estimated with good anti-interference ability.In this paper,three aspects of the array signal processing are mainly studied based on the non-uniform circle array form according to the practical engineering application,respectively for the recognition of radar signal polarization mode, the radar signal super-resolution direction finding and multi-core parallel computing of the signal processing.First, for the recognition of radar signal polarization mode, the minimum amplitude criterion recognition method and the combination of amplitude ratio and phase difference recognition method are proposed, based on the analysis and comparison of the two methods and the hardware realization of the system,this paper uses the combination of two methods to recognize the polarization modes of radar signal, and gives the correction methods and steps of the channel amplitude and phase error, and the spatial spectrum direction under polarization suppression. Secondly, in view of the radar signal super resolution direction finding, this paper uses the MUSIC algorithm to complete the hardware realization of the direction finding. For the channel amplitude and phase error influence on the direction finding performance in the direction finding system, zero amplitude and phase error correction method is proposed. The method is very simple,does not need auxiliary array,and is applicable to hardware implementation of the real-time direction finding system.Finally, in order to improve the processing speed, this paper puts forward the low accuracy and high peak accuracy search method, which can effectively improve the speed of direction finding. In this paper, the multicore DSP is used to realize spatial spectrum direction finding algorithm, which can reduce the signal processing time more effectively and improve the performance of the system.In addition, the subject of the system function and performance indicators were tested,through the analysis of the test results, the rationality of the system design is verified, which meets the requirements of the system design.