Uca-Nw Algorithm for Space-Time Antijamming

Abstract

Abstract-Space-time antijamming problems cause widespread concern recently in global navigation satellite system. Space-time adaptive procession (STAP) is an effective method to suppress interference signals, which contains two adaptive filters, i.e., spatial filter and temporal filter, and the array pattern can be automatically optimized by adjusting the weights obtained from a prescribed objective function. However, mismatch may occur between adaptive weights and data, due to the change of the interference location when receiver is shaking. In this case, the performance of STAP will degrade dramatically. To solve this problem, an effective nulling widen method based on uniform circular array (named as UCA-NW algorithm) is proposed for space-time antijamming. Through this method, an extension matrix is given to modify the covariance matrix, and the formed null can be broadened from azimuth angle and pitch angle, respectively. Thus, this algorithm can suppress interference signals effectively when the receiver is shaking, and the width of nulls can be controlled easily. Simulation results are presented to verify the feasibility and effectiveness of the proposed algorithm.

A Space-Frequency Anti-Jamming Algorithm Based on Sub-Band Energy Detection

“…In 2000, the application of STAP in global position system (GPS) was discussed by Fante and Vacarro [8], which is one of the most important techniques in GPS anti-interference at present. For the past few years, quite a few excellent STAP algorithms have been proposed to improve performance from different perspectives [9][10][11]. In [9] and [10], the robustness of STAP algorithm is improved by reconstructing signal covariance in different ways.…”

“…For the past few years, quite a few excellent STAP algorithms have been proposed to improve performance from different perspectives [9][10][11]. In [9] and [10], the robustness of STAP algorithm is improved by reconstructing signal covariance in different ways. A proportion differentiation algorithm is proposed to control time taps so that the interferences can be suppressed more effectively [11].…”