Based upon the diagonal loading technique and the structure of the space-time adaptive processors,a novel anti-jamming method of satellite navigation is proposed. According to matrix inverse theorem,the range of the d...Based upon the diagonal loading technique and the structure of the space-time adaptive processors,a novel anti-jamming method of satellite navigation is proposed. According to matrix inverse theorem,the range of the diagonal loading values for space-time adaptive wideband signal processing structure is deduced,and the optimum equation of diagonal loading beam forming algorithm of space-time structure is obtained. Then,by the analysis of two-dimensional oriented vector in direction of the perturbation interference,the wideband interference covariance matrix obtained in the weights training period is modified. Finally,the optimum weight of multi-linear constrained space-time adaptive beam-forming alogrithm is derived for anti-interference filter processing. The new method effectively widens the null steering beams when discrepancy happens. The computer simulation results prove the robustness of the proposed method.展开更多
In view of the low ranging efficiency of the conventional fixed frame-length algorithm in the inter-satellite link,an adaptive frame-length algorithm is proposed. The frame length is adjusted adaptively according to t...In view of the low ranging efficiency of the conventional fixed frame-length algorithm in the inter-satellite link,an adaptive frame-length algorithm is proposed. The frame length is adjusted adaptively according to the results of ranging and velocity measuring to improve ranging efficiency. Buffers which enable the frame length to be selected discretely and adaptively are introduced to avoid frequent hopping of the frame-length.Frame length marker is created to automatically identify the frame-length for frame synchronization procedures in receivers. The feasibility and the validity of the proposed algorithm to improve the efficiency of ranging are verified through both theoretic analysis and simulation,and the efficiency improves up to 88% when there are five buffers. This improvement can be further enhanced by increasing the number of buffers. Proper allocation of inter-satellite buffers is required to make a balance between the ranging efficiency and the system complexity.展开更多
基金Supported by the National High Technology Research and Development Program of China("863"Program)(2011AA1569)
文摘Based upon the diagonal loading technique and the structure of the space-time adaptive processors,a novel anti-jamming method of satellite navigation is proposed. According to matrix inverse theorem,the range of the diagonal loading values for space-time adaptive wideband signal processing structure is deduced,and the optimum equation of diagonal loading beam forming algorithm of space-time structure is obtained. Then,by the analysis of two-dimensional oriented vector in direction of the perturbation interference,the wideband interference covariance matrix obtained in the weights training period is modified. Finally,the optimum weight of multi-linear constrained space-time adaptive beam-forming alogrithm is derived for anti-interference filter processing. The new method effectively widens the null steering beams when discrepancy happens. The computer simulation results prove the robustness of the proposed method.
基金Supported by the National High Technology Research and Development Program of China(2013AA1548)
文摘In view of the low ranging efficiency of the conventional fixed frame-length algorithm in the inter-satellite link,an adaptive frame-length algorithm is proposed. The frame length is adjusted adaptively according to the results of ranging and velocity measuring to improve ranging efficiency. Buffers which enable the frame length to be selected discretely and adaptively are introduced to avoid frequent hopping of the frame-length.Frame length marker is created to automatically identify the frame-length for frame synchronization procedures in receivers. The feasibility and the validity of the proposed algorithm to improve the efficiency of ranging are verified through both theoretic analysis and simulation,and the efficiency improves up to 88% when there are five buffers. This improvement can be further enhanced by increasing the number of buffers. Proper allocation of inter-satellite buffers is required to make a balance between the ranging efficiency and the system complexity.
