CAJ | 학술논문

对SAR成像中多普勒中心频率进行研究，指出传统多普勒中心估计，在解卷绕过程中，会存在不稳定问题。针对这一问题，提出了一种基于频率调制的时域相关估计算法。该算法将多普勒中心搬移到非卷绕区，避免了卷绕出现；估计过程中使用最小二乘法更新调制频率，适应多普勒中心变化，保证了估计的稳定性，该算法相比传统估计算法，解决了传统算法不稳定问题，具有更强的适用性。最后通过真实的机载SAR数据，验证了该算法的有效性。
대SAR성상중다보륵중심빈솔진행연구，지출전통다보륵중심고계，재해권요과정중，회존재불은정문제。침대저일문제，제출료일충기우빈솔조제적시역상관고계산법。해산법장다보륵중심반이도비권요구，피면료권요출현；고계과정중사용최소이승법경신조제빈솔，괄응다보륵중심변화，보증료고계적은정성，해산법상비전통고계산법，해결료전통산법불은정문제，구유경강적괄용성。최후통과진실적궤재SAR수거，험증료해산법적유효성。
Based on studying the Doppler center in SAR processing, a correlation Doppler estimator method is proposed in the paper, which is based on frequency modulation and accords to the unstable problem of traditional method in unwrapping. The proposed algorithm solves the wrapped Doppler center by modulating signal into unwrapped field. During the processing, the method updates modulating frequency by least square method in order to get stable Doppler center, and then new algorithm solves the unstable problem, and it is more stable than the traditional method. The raw data imaging results show it is effective for SAR processing.