基于分段信號(hào)相關(guān)累加的變速度多站聯(lián)合直接定位方法
發(fā)布時(shí)間：2018-09-12 19:40
【摘要】：在低信噪比條件下,基于時(shí)延和多普勒頻移的直接定位算法在解決寬帶信號(hào)源定位時(shí)精度較差.針對(duì)此問題,提出了一種基于分段信號(hào)相關(guān)累加的變速度多站聯(lián)合直接定位算法,并給出了其克拉美羅下界.該算法利用多個(gè)變速度的觀測(cè)站對(duì)信號(hào)進(jìn)行接收,然后將同一觀測(cè)站接收的目標(biāo)信號(hào)分割成多段不重疊的短時(shí)信號(hào),采用最大似然估計(jì)器,聯(lián)合各段信號(hào)的時(shí)延、多普勒頻移信息對(duì)目標(biāo)進(jìn)行直接定位.算法充分利用了觀測(cè)信號(hào)包含的定位信息,并利用觀測(cè)站速度的變化增加了目標(biāo)位置信息,解決了分段信號(hào)聯(lián)合估計(jì)帶來的定位模糊問題,使定位精度進(jìn)一步提高,增加了算法的實(shí)用性.仿真實(shí)驗(yàn)表明,較之傳統(tǒng)直接定位算法,本文算法定位精度更高,尤其在低信噪比條件下更能逼近克拉美羅界.
[Abstract]:Under the condition of low signal-to-noise ratio (SNR), the accuracy of direct localization algorithm based on delay and Doppler shift is poor in solving the problem of wideband signal source location. In order to solve this problem, a multi-station joint direct location algorithm with variable speed based on piecewise signal correlation accumulation is proposed, and the lower bound of Clemero is given. The algorithm uses multiple variable speed stations to receive the signal, then divides the target signal received by the same observation station into multi-segment non-overlapping short-time signals, and uses the maximum likelihood estimator to combine the time delay of each segment signal. Doppler frequency shift information is used to locate the target directly. The algorithm makes full use of the location information contained in the observation signal, and increases the target position information by using the variation of the velocity of the observation station, solves the problem of location ambiguity caused by the joint estimation of the segmented signals, and further improves the positioning accuracy. The practicability of the algorithm is increased. The simulation results show that the proposed algorithm is more accurate than the traditional direct localization algorithm, especially in the case of low signal-to-noise ratio (SNR).
【作者單位】： 解放軍信息工程大學(xué);解放軍66159部隊(duì);
【基金】：國家高技術(shù)研究發(fā)展計(jì)劃(批準(zhǔn)號(hào):2012AA01A502,2012AA01A505) 國家自然科學(xué)基金(批準(zhǔn)號(hào):61401513)資助的課題~~
【分類號(hào)】：TN911.7
本文編號(hào)：2240030
[Abstract]:Under the condition of low signal-to-noise ratio (SNR), the accuracy of direct localization algorithm based on delay and Doppler shift is poor in solving the problem of wideband signal source location. In order to solve this problem, a multi-station joint direct location algorithm with variable speed based on piecewise signal correlation accumulation is proposed, and the lower bound of Clemero is given. The algorithm uses multiple variable speed stations to receive the signal, then divides the target signal received by the same observation station into multi-segment non-overlapping short-time signals, and uses the maximum likelihood estimator to combine the time delay of each segment signal. Doppler frequency shift information is used to locate the target directly. The algorithm makes full use of the location information contained in the observation signal, and increases the target position information by using the variation of the velocity of the observation station, solves the problem of location ambiguity caused by the joint estimation of the segmented signals, and further improves the positioning accuracy. The practicability of the algorithm is increased. The simulation results show that the proposed algorithm is more accurate than the traditional direct localization algorithm, especially in the case of low signal-to-noise ratio (SNR).
【作者單位】： 解放軍信息工程大學(xué);解放軍66159部隊(duì);
【基金】：國家高技術(shù)研究發(fā)展計(jì)劃(批準(zhǔn)號(hào):2012AA01A502,2012AA01A505) 國家自然科學(xué)基金(批準(zhǔn)號(hào):61401513)資助的課題~~
【分類號(hào)】：TN911.7
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