多極化星載合成孔徑雷達系統(tǒng)新工作方式及模糊分析
NEW OPERATION MODES AND AMBIGUITY ANALYSIS FOR SPACEBORNE POLARIMETRIC SAR
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摘要: 模糊是影響合成孔徑雷達 (SAR)圖像質(zhì)量的主要因素之一,多極化星載SAR的系統(tǒng)設(shè)計要求盡可能地抑制模糊,提高圖像質(zhì)量?，F(xiàn)有的多極化SAR系統(tǒng)極化時分工作方式雖然簡單易行,但在高軌道星載條件下系統(tǒng)的距離模糊問題變得十分嚴重。為了有效地解決這一問題,該文提出極化頻分和極化碼分兩種新的工作方式,并對它們進行了比較。計算表明這兩種新的工作方式確實可以提高系統(tǒng)對模糊的抑制程度。
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關(guān)鍵詞:
- 多極化星載合成孔徑雷達; 工作方式; 模糊分析; 距離模糊抑制
Abstract: The ambiguity is one of the most important facts that influence the quality of SAR images. In the process of designing a spaceborne polarimetric SAR system it is required to restrain the system ambiguity and improve the image quality effectively. Although the available polarization time-division (PTD) operation mode of spaceborne polarimetric SAR system can be realized simply, its range ambiguity becomes very serious for the high-orbit spaceborne sensors. In order to resolve this problem, new operation mode based on polarization frequency-division (PFD) and polarization code-division (PCD) are proposed in this paper. The characteristics of these three operation modes are also compared in detail. The computation results have proved that the system range ambiguity can be restrained by using the two new operation modes. -
Rolando L. Jordan, Bryan L. Huneycutt, SIR-C/X-SAR synthetic aperture radar system, IEEE Trans. on GRS, 1995, 33(4), 829-839.[2]Fawwaz T. Ulaby, Charles Elachi, Radar Polarimetry for Geoscience Applications, Boston, London, Artech House Inc, 1990, 281-295.[3]John C. Curlander.[J].Robert N, McDonough, Synthetic Aperture Radar Systems and Signal Processing, New York, John Wiley Sons Inc.1991,:-[4]D. Giuli, L, Facheris, M, Fossi, A. Rossettini, Simultaneous scattering matrix measurement through signal coding. Proc. IEEE 1990 International Radar Conference, Arlington, Virginia,USA: 1990, 258-262.[5]荊麟角,星載SAR距離模糊分布規(guī)律及其改進設(shè)計,電子科學(xué)學(xué)刊,1994,16(5),490-496. -
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