Removal of Azimuth Ambiguities with Bi-satellite by Multiple Transmitting and Multiple Receiving
双星同中心频率多发多收的方位解模糊

To achieve wide-swath and full azimuth resolution in space-borne Synthetic Aperture Radar (SAR), the satellite can take low Pulse Repetition Frequency (PRF) and small aperture in azimuth. Then azimuth ambiguities is inevitable. The constellation of small satellites can be used to remove azimuth ambiguities. In this paper, two satellites fly in a line is used to settle the problem. Both of the satellites transmit a Linear Frequency Modulation (LFM) signal of the same center frequency, but one is positive frequency modulation, the other is negative frequency modulation. The three phase centers resulted from the two satellites can be used to remove three azimuth ambiguities through space-time processing. An innovative method is proposed to simplify the calculating of the filter weight vector. Simulations show the validity of these methods.