多徑反射下低空目標檢測研究
Radar detection of low altitude target in multipath
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摘要: 該文主要考慮多徑反射對目標檢測的影響及采用頻率分集技術(shù)的多脈沖M/N檢測的參數(shù)選擇(M是超過檢測閥值的脈沖個數(shù),N是總脈沖個數(shù))。為了選取適當?shù)腗和N以保證檢測概率,必須獲得噪聲加目標乘以多徑因子后的統(tǒng)計分布。與其他研究不同的是,該文采用了更一般的反射模型,實際推導(dǎo)出無起伏和瑞利起伏目標的多徑回波功率的PDF,并應(yīng)用該PDF簡要計算出在多徑環(huán)境下多脈沖檢測的最佳M/N選擇與pF和pD的關(guān)系(與自由空間相比)。
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關(guān)鍵詞:
- 低空目標檢測; 多徑反射; 頻率分集
Abstract: This paper deals with the influence induced by multipath propagation and optimal selection of M/N when frequency diversity technique is used. To ensure the detection statistic and choose the correct M and N, it must be known that the probability density function (PDF) of the noise plus target times the multipath factor. Differ from other papers, the more general model of reflection is adopt, the PDF is derived for a nonfluctuating target and for a Rayleigh target, then the relation between M/N and P_D/P_F is got by multi-pulse detection in multipath. (compared with free-space). -
M.I.斯科爾尼克(美)編著,林茂庸等譯,雷達系統(tǒng)導(dǎo)論,北京,國防工業(yè)出版社,1992,140-148.[2]M.W.朗(美)著,薛德鏞譯,陸地和海面的雷達波散射特性,北京,科學(xué)出版社,1981,第4章. ［3］S.L. Wilson, B. D. Carison, Radar detection in multipath, IEE Proc.-F, 1999, 146(1), 45-52.[3]E. Daeipour, W. D. Blair, Y. Bar-Shalom, Bias compensation and tracking with monopulse radars in the presence of multipath, IEEE Trans. on AES, 1997, AES-33(3), 863-882.[4]何友,等著,雷達自動檢測與恒虛警處理,北京,清華大學(xué)出版社,1999,17-31. -
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