子帶時延補(bǔ)償法降低去斜脈沖壓縮的副瓣電平
Reducing sidelobe level of stretching pulse compression by subband delay compensation
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摘要: 線性調(diào)頻去斜體制中，去斜后頻率與目標(biāo)距離成正比，不同目標(biāo)距離的回波時延不一樣，由于各個單頻脈沖在時間上不對齊，對觀察區(qū)兩側(cè)的回波作統(tǒng)一時域加權(quán)后，加權(quán)的不對稱，導(dǎo)致高的副瓣，該文通過子帶濾波器組在每個子帶內(nèi)實(shí)現(xiàn)時延補(bǔ)償，多通道綜合后加權(quán)可大大降低副瓣電平。
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關(guān)鍵詞:
- 去斜; 子帶濾波器組; 時延補(bǔ)償; 副瓣電平
Abstract: In stretching processing system of linear FM, the frequency is in proportion to range and the delay of returns are different in different ranges. The single frequency pulses occupy different time intervals indicating the variation in time delay as a function of range after stretching processing. This will lead to high sidelobe when proceeding with a uniform weight in the whole time width. This paper describes a method of delay compensation with subband filter group. Sidelobe level of weighted signal will be greatly reduced after the synthesis of multiple channels. -
W.G. Carrara, R. S. Goodman, R. M. Ma.jewski, Spotlight Synthetic Aperture Radar Signal Processing Algorithms, Boston, London, Aretch House, 1995, 26-30.[2]J.M. Headrick, J. F. Thomaso, Applications of high-frequency radar, Radio Science, 1998, 33(4),1045-1054.[3]水鵬朗,保錚,基于頻帶分割的超寬帶雷達(dá)脈沖壓縮方法,電子學(xué)報,1999,27(6),51-54.[4]M. Skolnik, G. Andrews, J. P. Hansen, Ultrawideband microwave-radar conceptual design.[J]. IEEE Aerospace Electronic Systems Magazine.1995,10(10):25- -
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