米波雷達(dá)低仰角目標(biāo)多徑模型及其反演方法研究

鄭軼松; 陳伯孝

doi:10.11999/JEIT151013

米波雷達(dá)低仰角目標(biāo)多徑模型及其反演方法研究

doi: 10.11999/JEIT151013 cstr: 32379.14.JEIT151013

鄭軼松¹,
陳伯孝¹

基金項(xiàng)目:

國家自然科學(xué)基金(61573344)

計(jì)量
- 文章訪問數(shù): 1427
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2015-09-09
- 修回日期: 2016-01-22
- 刊出日期: 2016-06-19

Multipath Model and Inversion Method for Low-angle Target in Very High Frequency Radar

ZHENG Yisong¹,
CHEN Baixiao¹

Funds:

The National Natural Science Foundation of China (61571344)

摘要

摘要: 現(xiàn)有的低仰角測(cè)高方法多采用鏡面反射模型，將直達(dá)波與多徑簡化為兩遠(yuǎn)場(chǎng)點(diǎn)源；然而實(shí)際中不規(guī)則反射面使多徑回波波前畸變，遠(yuǎn)場(chǎng)點(diǎn)源模型難以完全描述多徑信號(hào)。針對(duì)此模型失配問題，該文重點(diǎn)研究低仰角目標(biāo)多徑模型，首先分析經(jīng)典多徑模型，對(duì)反射系數(shù)和反射面高度進(jìn)行參數(shù)反演；然后提出一種擾動(dòng)多徑模型，將反射面對(duì)多徑回波的影響建模為擾動(dòng)反射系數(shù)，并利用最大似然算法反演擾動(dòng)反射系數(shù)。計(jì)算機(jī)仿真結(jié)果驗(yàn)證了參數(shù)反演方法的有效性；實(shí)測(cè)數(shù)據(jù)驗(yàn)證了復(fù)雜情形下所建模型的合理性和反演方法的有效性，提高了低仰角測(cè)高算法在實(shí)際陣地的適用性。
- 米波雷達(dá) /
- 多徑模型 /
- 低仰角測(cè)高 /
- 擾動(dòng)反射系數(shù)
Abstract: The existing methods of altitude measurement for low-angle targets adopt the specular reflection surface model, and the direct and multipath signals are considered as two correlated far-field point sources. However, in reality, the wavefront of multipath signal is distorted by irregular reflection surface, and the far-field point source model is not enough to describe the multipath signal. To deal with this model mismatch problem, the low-angle multipath model is mainly studied. This paper begins with a discussion of classical multipath model and is followed by the inversion method of reflection coefficient and the height of reflection surface. Then the perturbation of the multipath signal caused by irregular reflection surface is modeled as perturbational reflection coefficient and a perturbational multipath model is developed with a maximum likelihood method to invert the proposed parameter. Simulation data processing results validate the effectiveness of the inversion method. The effectiveness of the proposed model and inversion method are validated by measured data processing results. These research results can provide valuable information for enhancing the applicability of the low-angle altitude measurement method in practical situations.
- High frequency radar /
- Multipath model /
- Altitude measurement of low-angle target /
- Perturbational reflection coefficient

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參考文獻(xiàn)(20)

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