融合多普勒頻移信息的陣列數(shù)據(jù)域直接定位方法
doi: 10.11999/JEIT170608
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61401513)，國(guó)家高技術(shù)研究發(fā)展計(jì)劃(2012AA01A502, 2012AA01A505)
Array-based Direct Position Determination Method Fusing Doppler Frequency Shift Information
Funds:
The National Natural Science Foundation of China (61401513), The National High Technology Research and Development Program of China (2012AA01A502, 2012AA01A505)
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摘要: 相比于傳統(tǒng)兩步定位方法，直接定位方法具有更高的定位精度，但現(xiàn)有的基于陣列模型的直接定位方法未能夠有效利用多普勒頻移信息，其定位精度有待進(jìn)一步提升。針對(duì)上述問(wèn)題，該文提出一種融合多普勒頻移信息的陣列數(shù)據(jù)域直接定位方法。首先構(gòu)建了融合多普勒信息的直接定位模型，然后基于最大似然準(zhǔn)則將信號(hào)源位置估計(jì)轉(zhuǎn)化為求解位置信息矩陣最大特征值問(wèn)題，并結(jié)合矩陣轉(zhuǎn)置性質(zhì)降低復(fù)雜度，最后通過(guò)2維搜索得到目標(biāo)信號(hào)源位置估計(jì)。仿真結(jié)果表明，所提方法較目前的陣列數(shù)據(jù)域直接定位方法和多普勒頻移直接定位方法的定位精度具有較大提高。
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關(guān)鍵詞:
- 陣列信號(hào)處理 /
- 直接定位 /
- 多普勒頻移 /
- 波達(dá)方向
Abstract: The Direct Position Determination (DPD) methods outperform the classic two-step localization methods in localization accuracy, while the existing DPD methods based on array antenna models do not exploit Doppler frequency shift information to improve localization accuracy further. Fusing Doppler frequency shift information, a DPD method based on array antenna model is proposed to overcome the above mentioned shortcoming. Firstly, a DPD model fusing Doppler frequency shift information is constructed. Then, a maximum likelihood estimator is designed and emitters position estimation is transformed to calculating the maximum eigenvalue of the matrix containing location information. The property of eigenvalue keeping unchanged after matrix transpose is used to simplify the calculation. Finally, the emitters position is estimated via a two-dimensional grid search. Simulations show that the proposed method is superior over the DPD methods based on array antenna models and the DPD methods only using Doppler frequency shift information in localization accuracy. -
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