A Novel Beam Position Design Algorithm of Dynamic Beam Time Allocation for Spaceborne Early Warning Radar Systems

Reasonable and rigorous beam position design is an important task of a spaceborne radar system to realize moving target detection. However, due to the high-speed movement of the satellite platform, the relative position between the radar and the detection area will change over the observation time, which may change the spaceborne radar beam point position and degrade the radar detection performance. Based on this observation, this article analyzes the impact of satellite platform motion on radar beam position and proposes a novel beam position design method of time-dynamic allocation that considers the influence of satellite platform motion. This algorithm updates the elevation and azimuth angles of the radar beam scanning based on the relative position between the satellite and the designed beam position center at a time. And it dynamically allocates detection times for different beam positions according to the target detection performance, thereby mitigating the signal-to-noise ratio (SNR) differences caused by the satellite motion. It can effectively improve the utilization rate of the time resources of a spaceborne radar system. Simulation results verify the effectiveness of the proposed algorithm.