克服宽测绘带SAR盲区问题的变脉冲周期技术

Variable pulse repetition frequency in the wide-swath SAR

针对宽测绘带方法大多都是对好几个子测绘带同时成像,一般只使用一副天线进行脉冲收发而带来盲区问题,提出了一种变周期脉冲技术来克服这种盲区问题,该方法利用脉冲周期的变化使每个脉冲的盲区位置相互错开,这样一个脉冲的盲区就能在其它脉冲周期内进行采样并且成像。具体论证了变周期脉冲技术引起的采样率变化;给出了变周期脉冲技术中的信号处理方法;讨论了变周期脉冲技术对合成孔径雷达成像的影响并给出了仿真结果。

In terms of most of the wide-swath SAR methods, more than one sub-swaths are imaged simultaneously, while most SARs use a single antenna for both transmitting and receiving, which will result in a blind range. A technique of variable pulse repetition frequency is studied for solving the blind-range problem. The difference of pulse periods makes the blind ranges of each pulse stagger, and then the blind range of one pulse can be sampled in other pulses. The variation formula of sampling rate with the technique is derived. The signal processing approach is given, and the effect of nonuniform sampling on image is also discussed. At last the simulation result is given.