基于參數(shù)化時頻分析的進動錐裙目標(biāo)瞬時微多普勒頻率提取方法
doi: 10.11999/JEIT150505
基金項目:
國家自然科學(xué)基金(61271024, 61201292, 61322103)，高等學(xué)校博士學(xué)科點專項科研基金博導(dǎo)類基金(20130203110013)，陜西省自然科學(xué)基礎(chǔ)研究計劃(2015JZ016)
Micro-Doppler Frequency Extraction for Cone-skirt Shaped Target with Precession Based on Parameterized Time-frequency Analysis
Funds:
The National Natural Science Foundation of China (61271024, 61201292, 61322103), The Foundation for Doctoral Supervisor of China (20130203110013), The Science Foundation of Shaanxi Province (2015JZ016)
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摘要: 微動目標(biāo)散射點的微多普勒對目標(biāo)運動、結(jié)構(gòu)參數(shù)的估計具有重要意義。該文針對表面光滑的錐裙目標(biāo)，首先依據(jù)進動錐裙目標(biāo)的等效散射點模型，推導(dǎo)出散射點的理論微多普勒曲線表達式。結(jié)合進動調(diào)制的錐裙目標(biāo)微多普勒曲線為多階正弦級數(shù)疊加的先驗信息，提出一種基于參數(shù)化時頻分析的進動錐裙目標(biāo)微多普勒曲線提取方法。針對多分量信號組成的錐裙目標(biāo)回波，該方法利用相干信號單距離多普勒干涉(CSRDI)方法估計錐旋頻率，進而利用參數(shù)化時頻分析估計散射點的微多普勒曲線，之后利用帶阻濾波器分離估計得到的散射點回波信號?；陔姶欧抡鏀?shù)據(jù)驗證了所提方法的有效性。
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關(guān)鍵詞:
- 錐裙目標(biāo) /
- 進動 /
- 微多普勒 /
- 參數(shù)化時頻分析 /
- 相干信號單距離多普勒干涉方法
Abstract: The micro-Doppler signatures can be utilized to the estimation of the motion and structure parameters of the targets. In this paper, based on the effective point scatterer model of the cone-skirt shaped target, the formulas of micro-Doppler induced by the precession are derived. Since the micro-Doppler curves induced by the precession are in the forms of the multi-stage superimposed sine series for the cone-skirt shaped target, an approach to extract the micro-Doppler frequency based on the parameterized time-frequency analysis is proposed. In this method, the precession frequency is first estimated via the Coherent Single Range Doppler Interferometry (CSRDI) algorithm, then the micro-Doppler curve of each scatterer is estimated based on the parameterized time-frequency analysis, and finally the scatterers echoes can be separated with the band-stop filter. In the simulation experiments, the proposed method is evaluated based on the electromagnetic computation data. -
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