數(shù)字電視外輻射源雷達(dá)目標(biāo)徙動(dòng)補(bǔ)償新方法
doi: 10.11999/JEIT141124 cstr: 32379.14.JEIT141124
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1.
(武漢大學(xué)電子信息學(xué)院 武漢 430072)
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2.
(電子信息系統(tǒng)復(fù)雜電磁環(huán)境效應(yīng)國(guó)家重點(diǎn)實(shí)驗(yàn)室 洛陽 471003)
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61331012, 61371197)，教育部博士點(diǎn)基金(2012 0141110077), CEMEE國(guó)家實(shí)驗(yàn)室開放課題基金(2014K0203B)和中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(2014212020201)資助課題
A Novel Migration Compensation Algorithm for Passive Radar using Digital TV Signals
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摘要: 增加相參積累時(shí)間是提高數(shù)字電視外輻射源雷達(dá)探測(cè)能力的一種較為常見的技術(shù)，但當(dāng)目標(biāo)速度和加速度較大時(shí)，長(zhǎng)時(shí)間相參積累會(huì)使目標(biāo)回波面臨距離徙動(dòng)和多普勒徙動(dòng)，且當(dāng)外輻射源雷達(dá)信號(hào)在慢時(shí)域?yàn)榉蔷鶆虿蓸?如中國(guó)移動(dòng)多媒體廣播信號(hào))時(shí)，廣泛采用的如Keystone變換和Radon-Fourier變換等徙動(dòng)補(bǔ)償算法已不能很好地適用。該文研究了一種基于兩次短傅里葉變換的徙動(dòng)補(bǔ)償算法，可同時(shí)適用于非均勻和均勻采樣信號(hào)，并在此基礎(chǔ)上提出一種修正算法，修正后的該算法能檢測(cè)具有更大速度和加速度的目標(biāo)，同時(shí)用于均勻采樣時(shí)，相對(duì)已有一些算法其運(yùn)算量更小。文中首先分析了非均勻采樣信號(hào)的特殊性及該特殊性帶來的新困難，接著基于該特殊信號(hào)的多普勒處理闡述了徙動(dòng)機(jī)理與該徙動(dòng)補(bǔ)償算法的基本原理。仿真和實(shí)測(cè)數(shù)據(jù)處理證明了該算法的有效性。
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關(guān)鍵詞:
- 外輻射源雷達(dá) /
- 相干積累 /
- 徙動(dòng)補(bǔ)償 /
- 兩步多普勒處理 /
- 非均勻采樣
Abstract: Increasing integration time is a main approach to improve performance of passive radar, but the range and Doppler migration may occur for high-speed and accelerated targets, and for non-uniform sampled signal in the slow time such as China mobile multimedia broadcasting signal, the most used migration compensation algorithms such as Keystone transform and Radon-Fourier transform are inapplicable. This paper uses a long-time coherent integration algorithm based on two-step Doppler processing, which can be applied to both the uniform and non-uniform sampled signal, a modified algorithm based on this method is proposed, which can detect higher speed-acceleration targets, and this algorithm can improve computation efficiency. The specialty and difficulty of non-uniform sampled signal are analyzed first, then on the basis of Doppler processing of certain signal, migration reason and migration compensation principle are demonstrated. Finally, simulation and real data processing confirm the effectiveness of the proposed method. -
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