Space-time Joint Anti-jamming Research Based on Pseudo-covariance Matrix

For the various interferences encountered by the current radar, both spatial domain filtering and time-frequency domain filtering have achieved good results. But there are also their own shortcomings. For example, the spatial domain filtering technique can suppress the sidelobe interference well and is easy to implement. However, the spatial domain filtering is limited by the degree of freedom of the array. When suppressing a large amount of interference, it is necessary to increase the number of array elements of the antenna, and the cost also increases. Space-time joint two-dimensional processing can increase the degree of freedom of the antenna array by adding time taps after each antenna element without increasing the array elements, and can also increase the degree of freedom of the antenna array. The interference at a specific frequency is suppressed. In this paper, a method of covariance matrix reconstruction is proposed to improve the space-time joint anti-interference. A better anti-interference effect has been achieved.