An Accurate and Efficient FMCW SAR Raw Data Simulation Method with Moving and Fixed Targets
Funds:
The National Natural Science Foundation of China (61475049)
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摘要: 近幾年來，由于小型無人機的興起，基于FMCW體制的合成孔徑雷達(SAR)由于體積小，重量輕，成本低得到了快速發(fā)展。然而，由于傳統(tǒng)的脈沖SAR中的停-走假設(shè)不再成立，F(xiàn)MCW SAR成像處理與傳統(tǒng)的脈沖SAR有著很大的不同，這樣使得在FMCW SAR實測數(shù)據(jù)進行處理和分析時往往缺乏理論支撐。因此，開展FMCW SAR的信號處理研究具有重要的現(xiàn)實意義和軍事價值。目前，國內(nèi)外關(guān)于FMCW SAR的研究主要集中在其成像處理方法上，在回波模擬方向研究甚少，特別是對于既包含分布式運動目標又有靜止目標下的真實場景下的FMCW SAR回波快速模擬方法更是鮮有涉及?；诖耍撐脑贔MCW SAR平臺脈內(nèi)連續(xù)運動的基礎(chǔ)上推導了一種適用于動靜目標的精確的FMCW SAR 2維頻域模型，并基于該模型提出一種高效精確的FMCW SAR動靜目標混合場景回波模擬的方法。點目標和場景目標的仿真試驗驗證了該模擬方法的有效性，效率分析發(fā)現(xiàn)該種模擬方法的效率遠高于傳統(tǒng)的仿真方法。
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關(guān)鍵詞:
- 合成孔徑雷達 /
- 調(diào)頻連續(xù)波 /
- 回波模擬 /
- 2維頻譜 /
- 運動目標
Abstract: Because of compact size, light weight, low-cost, FMCW SAR develops rapidly in recent years with the rose of the small Unmanned Aerial Vehicle (UAV). However, the signal processing methods are very different from that of pulsed-SAR due to the invalid suppose of stop and go and hence it is some confused in the real-data processing. Therefore, it is significant to make a deep research of FMCW SAR. However, much attention is paid on the aspect of data focusing while little research concentrates on the raw data simulation, especially for moving targets. In view of these, this paper firstly derived an accurate 2-D spectrum model in the consideration of the in-pulses motion of FMCW SAR, and then a highly-efficient raw data simulation method for FMCW SAR with moving targets is proposed. Point targets and real scene raw data simulation experiments are carried out to validate it and the its efficiencyis analyzed, results show its highefficiency comparing with the conventional methods.-
Key words:
- SAR /
- Frequency Modulation Continuous Wave (FMCW) /
- Raw data simulation /
- 2-D spectrum /
- Moving target
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