基于窄帶微多普勒調(diào)制的錐體目標(biāo)參數(shù)估計
doi: 10.11999/JEIT140814
基金項(xiàng)目:
國家自然科學(xué)基金(61271024, 61201296, 61322103)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
Parameter Estimation of Cone-shaped Target Based on Narrowband Micro-Doppler Modulation
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摘要: 當(dāng)雷達(dá)對錐體目標(biāo)發(fā)射窄帶信號時，進(jìn)動調(diào)制會使回波中包含的散射中心瞬時頻率發(fā)生周期性變化，這種變化可以反映出目標(biāo)幾何尺寸與結(jié)構(gòu)特性，針對此該文提出一種基于窄帶微多普勒調(diào)制的空間錐體目標(biāo)參數(shù)估計方法。首先對目標(biāo)散射特性進(jìn)行分析，推導(dǎo)進(jìn)動引起的目標(biāo)散射中心瞬時頻率變化公式；然后利用時變自回歸模型估計散射中心瞬時頻率，并對估計結(jié)果進(jìn)行重新關(guān)聯(lián)以消除其中出現(xiàn)的關(guān)聯(lián)錯誤；最后根據(jù)錐頂和錐底散射中心瞬時頻率變化性質(zhì)，結(jié)合目標(biāo)彈道估計得到目標(biāo)幾何尺寸參數(shù)及微動參數(shù)?；陔姶庞嬎銛?shù)據(jù)的實(shí)驗(yàn)結(jié)果驗(yàn)證了該文所提方法的有效性和精確性。
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關(guān)鍵詞:
- 目標(biāo)識別 /
- 空間錐體目標(biāo) /
- 窄帶微多普勒調(diào)制 /
- 瞬時頻率估計 /
- 參數(shù)估計
Abstract: When radar transmits the narrowband signal to the cone-shaped target, the modulation induced by precession causes the periodic change of scattering centers Instantaneous Frequency (IF) contained in echo, which can reflect the targets geometry and structure characteristics. Aiming at this, a parameter estimation method for space cone-shaped target is proposed based on narrowband micro-Doppler modulation. First, the scattering properties of the cone-shaped target are analyzed, and the scattering centers IF variation formulas caused by precession are derived. Then, the Time-Varying AutoRegressive (TVAR) model is utilized to estimate the IF variations from the narrowband echoes of the cone-shaped target, and reassociation is implemented to fix the estimation errors. Finally, based on the properties of the IF variations of the top and bottom scattering centers and the trajectory, the target geometry and micro-motion parameters are estimated. Experiments based on the electromagnetic computation data verify the validness and accuracy of the proposed method. -
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