基于瞬時頻率估計的進動錐體目標微多普勒頻率提取方法
doi: 10.11999/JEIT140985 cstr: 32379.14.JEIT140985
基金項目:
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: 該文針對進動錐體目標的微動特性提取，建立等效散射點模型下的微多普勒頻率與目標運動參數(shù)關(guān)系。結(jié)合進動調(diào)制的微多普勒頻率近似正弦變化規(guī)律的特點，提出基于瞬時頻率估計和隨機抽樣一致性(RANSAC)的進動目標微多普勒頻率提取方法。該方法將回波信號分為若干段，每一段的回波信號近似為若干線性調(diào)頻(LFM)信號分量之和，通過調(diào)頻Relax算法估計各信號分量的瞬時頻率，并通過隨機抽樣一致性算法估計散射點的微多普勒曲線。基于仿真數(shù)據(jù)和電磁計算數(shù)據(jù)的實驗驗證了該方法的有效性及穩(wěn)健性。
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關(guān)鍵詞:
- 目標識別 /
- 進動目標 /
- 微多普勒頻率 /
- 線性調(diào)頻信號 /
- 隨機抽樣一致性
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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