基于瞬時(shí)頻率估計(jì)的進(jìn)動(dòng)錐體目標(biāo)微多普勒頻率提取方法
doi: 10.11999/JEIT140985
基金項(xiàng)目:
國家自然科學(xué)基金(61271024, 61322103, 61301280)和全國優(yōu)秀博士學(xué)位論文作者專項(xiàng)資金(FANEDD-201156)資助課題
Micro-Doppler Frequency Extraction for Cone-shaped Target with Precession Based on Instantaneous Frequency Estimation
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摘要: 該文針對(duì)進(jìn)動(dòng)錐體目標(biāo)的微動(dòng)特性提取，建立等效散射點(diǎn)模型下的微多普勒頻率與目標(biāo)運(yùn)動(dòng)參數(shù)關(guān)系。結(jié)合進(jìn)動(dòng)調(diào)制的微多普勒頻率近似正弦變化規(guī)律的特點(diǎn)，提出基于瞬時(shí)頻率估計(jì)和隨機(jī)抽樣一致性(RANSAC)的進(jìn)動(dòng)目標(biāo)微多普勒頻率提取方法。該方法將回波信號(hào)分為若干段，每一段的回波信號(hào)近似為若干線性調(diào)頻(LFM)信號(hào)分量之和，通過調(diào)頻Relax算法估計(jì)各信號(hào)分量的瞬時(shí)頻率，并通過隨機(jī)抽樣一致性算法估計(jì)散射點(diǎn)的微多普勒曲線。基于仿真數(shù)據(jù)和電磁計(jì)算數(shù)據(jù)的實(shí)驗(yàn)驗(yàn)證了該方法的有效性及穩(wěn)健性。
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關(guān)鍵詞:
- 目標(biāo)識(shí)別 /
- 進(jìn)動(dòng)目標(biāo) /
- 微多普勒頻率 /
- 線性調(diào)頻信號(hào) /
- 隨機(jī)抽樣一致性
Abstract: Based on the equivalent scatter point model, the relationship between the micro-Doppler frequencies and the motion parameters of the cone-shaped target with precession is established. Due to the approximately sinusoidal form of the micro-Doppler frequency modulation induced by the precession, an approach to extract the micro-Doppler frequency of the target with precession based on the instantaneous frequency estimation and the RANdom SAmple Consensus (RANSAC) is proposed. In this method, the target echo signal is first divided into several segments. Then each segment of the echo signal approximates to the sum of several components of the Linear Frequency Modulation (LFM) signal, and an algorithm based on the extended Relax method is used to estimate the instantaneous frequency of the each LFM signal. Thus the micro-Doppler curve of each equivalent scatter point is estimated by the RANSAC algorithm. In the simulation experiments, the performance of the proposed method is evaluated via the simulation data and electromagnetic computation simulation data. -
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