摘要
分布式小卫星SAR能够打破传统单星SAR测绘带宽和方位分辨率的矛盾。该文分析了一种沿航向排列分布式小卫星宽测绘带二维高分辨率成像技术,每颗卫星同时发射接收不同频率的线性调频信号,先分别在每个子带解方位多普勒模糊,并将方位多普勒中心频率调整至零频,然后在距离向进行子带拼接得到大带宽的线性调频信号从而得到高的距离向分辨率。此外,这种多发多收的工作方式还增加了系统平均发射功率,提高了信噪比。
Distributed small satellite SAR can overcome the traditional contradiction of swath and azimuth resolution. In this paper, an algorithm to achieve both two dimensional high resolution and wide swath is proposed. Every small satellite work in the active state, they transmit and receive different frequency band signal simultaneity. First, the azimuth ambiguity is eliminated in each frequency sub-band, then the signal is rectified to zero Doppler frequency, after that this algorithm does the range spectral synthesis to achieve high range resolution. In other aspects, this active work mode can enhance the system＇s average transmit power, and increase the SNR.
出处
《电子与信息学报》
EI
CSCD
北大核心
2009年第2期501-504,共4页
Journal of Electronics & Information Technology
关键词
分布式小卫星SAR
空域滤波
距离向子带拼接
宽测绘带
二维高分辨率
Distributed small satellites SAR
Space filtering
Range sub-band synthesis
Wide swath
Twodimensional high resolution
