| Global navigation satellite system(GNSS) could provide high-precision, all-time and global service so that it has been widely used. Since the satellite is twenty thousand kilometers away from the user, and the satellite signal itself is relatively weak, the satellite signal is vulnerable to interference during transmission. Therefore, the research on the satellite navigation anti-jamming technology is a hot issue. Most of the existing satellite navigation anti-jamming technology is based on the uniform array. Under the certain number of array elements, the number of estimated interferences is less than array elements number. While the number of estimated interferences under the co-prime array may be greater than the array element number. So the satellite navigation interference suppression technology based on co-prime array is discussed.Firstly, the received signal model by the uniform linear array and the co-prime array and several kinds of common array errors are introduced. What's more, the performance of uniform linear array and co-prime array are compared just to supply the theoretical basis for the subsequent work.Secondly, an interference suppression algorithm based on co-prime array is proposed. The algorithm needn't know the number of interferences. When the interferences number is greater than the array element number, the jamming algorithm based on uniform array will be failed. While the interference suppression algorithm based on co-prime array can cancel the large interferences. Meanwhile, when interferences are close each other, jamming performance based on the co-prime array is better than that of uniform array.Finally, aiming at co-prime array with array error, an interference suppression algorithm based on non-calibration co-prime array is proposed, which could estimate the satellite DOA and array errors simultaneously. The estimated DOA results and acquisition results before and after calibrating are compared to prove the effectiveness of the proposed algorithm. |
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