Abstract: The aerospace information network architecture jointly constructed by data link terminals and satellites can effectively expand communication coverage. In order to meet the requirements of multi-user flexible access and anti-destruct and endurance of data link communication networks, the spaceborne phased array spatial anti-jamming technology is studied, and an adaptive beam iterative algorithm combined with power inversion algorithm and despread respread algorithm is proposed. Firstly, the power inversion method is used to suppress the high-power suppressive interference , ensuring the receiver can achieve reception synchronization; Then, the coarse synchronization information such as time delay and frequency offset is obtained through despread respread processing, so that the local reference signal is constructed; After that, serial interference cancellation is introduced to eliminate the impact of user multiple access interference in the received array signals, thereby minimizing the error between the beamforming weights and the actual incident steering vector of the signal; Finally, the adaptive anti-jamming beam weights are fast and robust iterated through the second-order least mean square (LMS) iteration. Simulation verification was carried out under the scenario of a 6-element uniform linear array (ULA), strong interference and multi-user incidence. The results show that the output signal-to-interference-plus-noise ratio (SINR) improvement of the proposed algorithm is close to the theoretical gain value, which is significantly better than the performance of the existing algorithms. Through comparison, the proposed adaptive anti-jamming receiving beam design algorithm can not only ensure reliable reception under strong interference incidence, but also effectively resist the impacts of multiple access interference and system frequency offset estimation errors. It can iteratively update the spatial multi-user beam weights in real-time and adaptively, exhibiting superior anti-jamming multi-user reception performance, which fully meets the anti-destruct and dynamic adaptive requirements of aerospace information network.

Key words: spaceborne phased array antennas, spatial anti-jamming, multiple access interference, Doppler effect, adaptive beamforming