Research On Beamforming Of Array And Method Of Hardware Implementation

At 12:12 on January 17,2010, China has successfully launched the third Beidou navigation satellite into orbit, it is marking the Beidou Navigation Satellite System Engineering construction, and also marks our country into the great rank of navigation in accelerating step. The article is developed in view of this situation. Beidou system as a trend of China's military and civilian in the future, it not only has the accurate capability of navigation receiver's positioning signals, but also has adopt effective measure in anti-interference to ensure reliability and stability of the system when faced on a specific environment.By analyzing the variety of anti-interference technology of navigation receiver and the development status of array signal processing technology in current, this paper presents a spatial filter based on antenna array technology to achieve interference suppression. For concrete realise this strategy, the text has a concrete discussion in the key issues of the array signal processing technology-DOA estimation algorithm and digital beam-forming. The article carry out the theoretical analysis and Matlab simulation analysis for non-coherent signal DOA estimation algorithm and the conventional adaptive beamforming method, obtained the classical MUSIC algorithm performances in a variety of environments and the use conditions of conventional beamforming method, and the face of coherent multipath signal DOA estimation, this paper studied the use of Fourth-order cumulant+Forward/Backward spatial smoothing+MUSIC algorithm for joint to complete direction of arrival estimation faced on the problem of coherent, in the process of theoretical derivation also gives a visual Matlab simulation analysis, at last article for the existence of the main lobe interference in adaptive beamforming is proposed a method that based on block matrix preprocessing, and through theoretical analysis and Matlab simulation verify the feasibility of the algorithm.In engineering implementation of adaptive digital beamforming, there has not appeared a mature application yet, it focus on the inverse of matrix as a bottleneck. In this paper, proposed a method of inverse of matrix's operation with the FPGA in adaptive digital beamforming algorithm. By establish a model from the algorithm and a hardware, then make a software and hardware co-simulation experiment to validate the feasibility of the algorithm.