天線孔徑相位分布對綜合陣列方向圖和多普勒-時延響應(yīng)的影響
EFFECTS OF ANTENNA APERTURE PHASE DISTRIBUTION ON THE SYNTHETIC ARRAY PATTERN AND THE DOPPLER-DELAY RESPONSE
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摘要: 本文簡要回顧了合成孔徑側(cè)視雷達系統(tǒng)和它的天線坐標(biāo)系之間的幾何關(guān)系,探討了合成孔徑側(cè)視雷達天線的孔徑電流分布的理論要求。在R.C.Heimiller(1962)和R.W.Bayma(1975)等人工作的基礎(chǔ)上,進一步論證了當(dāng)天線孔徑電流分布不是同相時,它對合成孔徑側(cè)視雷達的綜合陣列方向圖和多普勒-時延響應(yīng)的影響,并在平方律和立方律相位分布條件下,對這些影響作了計算。計算表明,它不僅會使綜合陣列增益降低,而且會使多普勒-時延響應(yīng)的信號-模糊比下降?？紤]到這些影響,本文對R.W.Bayma等人(1975)提出的重復(fù)頻率的取值范圍提出了補充意見。
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關(guān)鍵詞:
Abstract: The geometrical relationship between the synthetic aperture radar (SAR) and its an-tenna coordinate system is reviewed briefly. The ideal aperture current distribution of SAR antenna is discussed in theoretical sense. On the basis of results derived by R. C. Heimiller (1962) and R. W. Bayma (1975), the effects of current distribution not in phase on the pattern of synthetic array and the Doppler-delay response are further analysed, and the numerical results calculated in the case of quadratic and cubic phase distributions are given. These results show that such phase distributions will cause the gain of synthetic array and the signal to ambiguity ratio of Doppler-delay response to be decreased. In consideration of these effects, the author proposes his additional remarks on the range of repetition frequency given by R. W. Bayma (1975). -
R.C.Heimiller, IRE Trans. on MIL, MIL-6(1962),122.[4]馮孔豫,天線波束相位理論,(待發(fā)表) -
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