A two-step processing approach for parallel bistatic spotlight FMCW SAR focusing

被引：0
作者：
National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an, 710071, China [1 ]
机构：
[1] National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an
来源：
Liang, Y. (yliang@xidian.edu.cn) | 1975年 / Chinese Institute of Electronics卷 / 41期
关键词：
Azimuth pre-filter; Doppler frequency shift; Frequency modulated continuous wave (FMCW); Instantaneous frequency; Parallel bistatic spotlight SAR; Residual focusing;
D O I：
10.3969/j.issn.0372-2112.2013.10.017
中图分类号：
学科分类号：
摘要：
This paper establishes the received signal model of parallel bistatic spotlight SAR adopting frequency modulated continuous wave (FMCW), and analyzes the affect of doppler frequency shift introduced by platform's continuous motion while radar transmitting and receiving signals. Then using the concept of instantaneous frequency and through introducing the parameters, i. e. the sum and difference of the closest slant range, and the half quasi bistatic angle, the received signal expression in two dimensional wave-number domain is deduced. Based on this, a two-step processing approach for parallel bistatic spotlight FMCW SAR focusing is presented, which uses azimuth pre-filtering step to overcome azimuth spectral folding phenomenon first. Following this operation, a second residual focusing step is applied to carry out doppler frequency shift compensation and the bistatic frequency scaling processing. Meanwhile, the time frequency relations changing from each stage of azimuth pre-filtering are analyzed in detail. Simulation data processing verifies the analysis and the proposed algorithm.
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页码：1975 / 1982
页数：7
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