利用重叠子阵交替发射提高机载双基正侧阵雷达杂波抑制性能的方法

Clutter Suppression Improvement for Airborne Bistatic Sidelooking Radar with Overlapped Subarrays Alternate Transmitting

距离非平稳杂波抑制是机载双基雷达空时自适应处理面临的重要困难之一。针对此问题,该文提出一种利用重叠子阵交替发射技术来抑制距离非平稳杂波的新方法。该方法通过交替发射使机载双基正侧阵雷达的杂波脊落在发射和接收空间频率以及多普勒频率构成的3维频率空间的一个平面上,并且目标不落在该平面。由于该杂波平面具有距离平稳性,这保证了空时自适应处理可以有效地抑制该杂波平面,进而能够有效抑制距离非平稳杂波。仿真结果验证了该方法的有效性。

Range-dependent clutter suppression is one of the most important problem in the airborne bistatic radar Space-Time Adaptive Processing （STAP）. To overcome the problem, a novel technique using overlapped subarray alternate transmitting is developed. By virtue of the alternate transmitting, the clutter ridges of all range bins of airborne bistatic sidelooking radar are located in the same plane of a three-dimensional space which is constructed by transmitting spatial frequency, receiving frequency and Doppler frequency. Due to the range-independence of the clutter plane, it can be well suppressed by STAP. Then range-dependent clutter is efficiently suppressed. Numerical examples are given to demonstrate the effectiveness of the presented method.