步进频、脉冲和连续波SAR的对比研究

Comparative Study on Stepped Frequency,Pulsed and Continuous Wave SARs

连续波和步进频SAR涌现了多种新的应用,研究与常规脉冲SAR的差异有助于掌握各自的优势与不足,为雷达成像的信号选择提供参考和依据。从三种SAR的发射信号出发,对回波信号进行了建模,根据三种信号脉内和脉间距离走动的不同,推导了距离向成像处理算法,并进行了分析和仿真。在此基础上,对比了三种SAR的距离、方位分辨率等成像性能和影响因素,从发射功率、作用距离、处理的数据量、结构特点和存在的问题上,说明了三种SAR的优缺点、适合的应用平台和领域。

Continuous wave SAR and stepped frequency SAR have found a variety of new applications, but there are some differences when compared with conventional pulsed SAR. Studying the differenees helps to master their advantages and disadvantages, and then provide reference and basis for the signal choice of radar imaging. Starting from the transmitted signal of the three kinds of SAR, the echo signal models are developed. According to their differences of the intra-pulse and inter-pulse walking distance, the range image processing algorithms are deduced, analyzed and simulated in detail. On this basis, their imaging properties and influence factors are compared, such as range and azimuth resolution. Then the merits and faults, the suitable application platform and fields of the three kinds of SAR are illustrated based on the transmitting power, detection range, the amount of data, structure characteristics, and the existing problems.