基于時(shí)間-調(diào)頻斜率分布的多普勒調(diào)頻率估計(jì)

汪金真; 宿紹瑩; 陳曾平

doi:10.11999/JEIT150116

基于時(shí)間-調(diào)頻斜率分布的多普勒調(diào)頻率估計(jì)

doi: 10.11999/JEIT150116 cstr: 32379.14.JEIT150116

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出版歷程
- 收稿日期: 2015-01-21
- 修回日期: 2015-03-13
- 刊出日期: 2015-09-19

Estimation of Doppler Rate Based on Time-chirp Distribution

摘要

摘要: 該文提出基于時(shí)間-調(diào)頻斜率分布(TCD)的目標(biāo)回波線性調(diào)頻(LFM)信號(hào)的多普勒調(diào)頻斜率估計(jì)算法。分析目標(biāo)回波LFM信號(hào)的TCD表明自項(xiàng)和交叉項(xiàng)均在多普勒調(diào)頻斜率處取得極大值，采用垂直調(diào)頻斜率軸投影積分可以有效抑制TCD的非多普勒調(diào)頻斜率交叉項(xiàng)及噪聲，增強(qiáng)多普勒調(diào)頻斜率項(xiàng)。同時(shí)，采用二次搜索方法搜索TCD投影積分量最大值保證多普勒調(diào)頻斜率估計(jì)精度，有效減少運(yùn)算量；理論分析表明，通過(guò)合理控制搜索步長(zhǎng)，可以使得計(jì)算耗時(shí)在一定條件下最小。仿真實(shí)驗(yàn)驗(yàn)證了該方法的有效性，該方法具有較高的估計(jì)精度以及抗噪性能。
- 信號(hào)處理 /
- 目標(biāo)回波 /
- 多散射點(diǎn) /
- 線性調(diào)頻 /
- 多普勒調(diào)頻斜率 /
- 時(shí)間-調(diào)頻斜率分布
Abstract: Based on the analysis of the instantaneous phase characteristics of the echo Linear Frequency Modulated (LFM) signals respectively from single and multiple scatter point targets, an algorithm of the Doppler chirps estimation based on the Time-Chirp Distribution (TCD) of echo LFM signals from targets is proposed, in which the projection integral vertical to the chirp axis is adopted to enhance the Doppler chirps term of the TCD, but to suppress non-Doppler chirps cross term of the TCD and noise. Simultaneously, two-time search method is taken to obtain the maximum value of the TCDs projection integral to guarantee the estimation accuracy of the Doppler chirp and effectively reduce the amount of computation. The theoretical analysis shows that the time-consuming of calculation can be controlled to the minimum in the appropriate search step. Simulation results show the effectiveness of this method that it has higher estimation accuracy and good immunity for noise.
- Signal processing /
- Target echo /
- Multiple scatter point /
- Linear Frequency Modulated (LFM) /
- Doppler chirp /
- Time-Chirp Distribution (TCD)

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