CAJ | 학술논문

基于正交频分复用(OFDM)调制的合成孔径雷达(SAR)信号是一种新兴的宽带雷达信号形式。该文先从模糊函数的角度出发，分析了多普勒偏移对OFDM SAR信号的影响。多普勒偏移不仅会降低OFDM信号的距离向脉冲压缩系数，还会影响SAR系统的方位向聚焦效果。为了突破多普勒偏移对OFDM SAR系统的限制，该文设计了一种基于距离多普勒域的多普勒偏移补偿方案，并利用仿真实验验证了该补偿方案的有效性。
기우정교빈분복용(OFDM)조제적합성공경뢰체(SAR)신호시일충신흥적관대뢰체신호형식。해문선종모호함수적각도출발，분석료다보륵편이대OFDM SAR신호적영향。다보륵편이불부회강저OFDM신호적거리향맥충압축계수，환회영향SAR계통적방위향취초효과。위료돌파다보륵편이대OFDM SAR계통적한제，해문설계료일충기우거리다보륵역적다보륵편이보상방안，병이용방진실험험증료해보상방안적유효성。
The OFDM waveform employed in SAR systems is a novel waveform for Ultra-Wideband (UWB) SAR, which attracts many attentions in recently years. In this paper, the influence of Doppler shift on OFDM SAR is analyzed in terms of ambiguity function. The Doppler shift can not only reduce the pulse compression coefficient of OFDM signals in range, but also affect the focusing quality of SAR systems in azimuth. In order to overcome the restriction of Doppler shift on OFDM SAR systems, a method of Doppler compensation in range Doppler domain is designed. Simulation results demonstrate the effectiveness of the compensation method.