一種新穎的SAR真實(shí)場景原始數(shù)據(jù)頻域模擬方法
A Novel Method of SAR Real Scenario Raw Data Frequency-domain Simulation
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摘要: 采用時域模擬方法來實(shí)現(xiàn)真實(shí)場景數(shù)據(jù)模擬時，由于計算機(jī)計算速度和數(shù)據(jù)容量的限制，數(shù)據(jù)模擬十分困難。該文提出了一種新穎的SAR真實(shí)場景原始數(shù)據(jù)的頻域模擬方法。該方法改變了傳統(tǒng)的時域到頻域?qū)?yīng)關(guān)系，采用空域到頻域的對應(yīng)關(guān)系，真實(shí)場景數(shù)據(jù)兩維FFT后在頻域插值和移位，并與所采用的頻域轉(zhuǎn)移函數(shù)相乘，再經(jīng)過IFFT得到模擬的原始數(shù)據(jù)。通過對點(diǎn)目標(biāo)模擬和真實(shí)場景數(shù)據(jù)模擬仿真試驗(yàn)，證明了該方法的有效性，模擬結(jié)果顯示該模擬方法與以往的模擬算法相比極大地提高了模擬速度。
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關(guān)鍵詞:
- SAR; 真實(shí)場景; 原始數(shù)據(jù)模擬
Abstract: Because of the limitation of the PCs velocity and capability, it is difficult to simulate SAR real scenarios in time-domain. In this paper, a novel method of SAR real scenario raw data simulation, frequency-domain simulation, is introduced. This method employs space-frequency relationship, other than the traditional time-frequency relationship. After 2D FFT, the scenarios data are interpolated and shifted. Then these data are multiplied by the transfer function of frequency-domain, and followed by IFFT. The simulated raw data can be obtained. The validity of this method is fully manifested by the simulation experiments of point target and the real scenarios. The result show that the method in this paper, compared with the time-domain methods, greatly improve the simulation speed. -
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