|
|
|
| The Analysis of FMCW SAR Signal and Image Study |
| Liang Yi; Wang Hong-xian;Xing Meng-dao;Bao Zheng |
| National Key Lab of Radar Signal Processing, Xidian Univ, Xi’an 710071, China |
|
|
|
|
Abstract Based on the difference of work mechanism between Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) and Pulse Synthetic Aperture Radar, which leads to different form of received signal, this paper establishes the model of FMCW SAR echo, analyzes its characteristics, and reveals the Doppler frequency shift effect in range direction induced by the continuous motion while radar transmitting and receiving signal. The Residual Video Phase (RVP), inherent to Dechirp-on-receive system, is represented in the form of convolution and compensated for in the frequency domain. Also Modified Frequency Scaling Algorithm is presented. Compared to the conventional method, it almost adds no additional computation load. Finally, point target simulation validates the correctness and the effectiveness of the presented method.
|
|
Received: 16 April 2007
|
|
|
|
|
|
|
|
|
2008, Vol. 30 
