综合脉冲孔径雷达的一种长时间相参积累方法

A long-term coherent integration method for SIAR

针对综合脉冲孔径雷达(SIAR)长时间相参积累处理中运动补偿处理复杂和运算量太大问题,提出通过适当增大距离分辨单元,将距离走动和多普勒走动二维补偿处理简化为多普勒走动的一维补偿处理方法.首先建立了多普勒频率变化与目标运动加速度、角速度的关系模型,分析了加速度、角速度对多普勒频率的影响;然后提出一种基于多普勒频率变化的运动补偿方法,并对补偿前后的相参积累脉冲数进行了仿真分析.仿真结果表明,该方法可使SIAR相参积累时间延长数十倍,运算量减少为数百分之一.

Addressing the complex motion compensation and heavy computation burden in the process of long-term coherent integration for synthetic impulse aperture radar(SIAR),this paper proposes a processing method which simplifies the two-dimensional compensation processing of distance migration and Doppler migration to one-dimensional compensation of Doppler migration by means of appropriately increasing the range resolution unit.Firstly,the paper establishes the model of relations between Doppler frequency variation,target motion acceleration and angular velocity,analyzing the effects of acceleration and angular velocity on Doppler frequency,and then proposes a motion compensation method based on Doppler frequency variation and also makes simulation analyses on the number of coherent integration pulses before and after the compensation.The simulation results show that the proposed method can prolong the coherent integration time of SIAR by dozens of times,and reduce the amount of calculation to much less than 1%.