| 摘要: |
| 介绍了双星时频差定位原理，在此基础上研究了在地球表面约束条件下的双星定位系统的定
位精度理论下界。利用推导的定位精度Cramer-Rao下界，仿真分析了定位参数估计精度、卫
星星历、目标辐射源位置以及辐射源载波频率等因素对定位精度的影响，并给出了物理解释
。定位仿真试验结果表明，定位精度变化趋势与Cramer-Rao下界一致，证明了理论推导的正
确性。 |
| 关键词: 双星定位 时频差 参数测量误差 定位误差 Cramer-Rao下界 |
| DOI： |
|
| 基金项目:“十二五”预研项目（40901050301，513210901）；国防科
技预研基金项目（9140A22020212JB5101） |
|
| Cramer-Rao lower bounds for position estimation in dual-satellite geolocation system |
| YAN Hang,YAO Shan-feng |
| () |
| Abstract: |
| The principle of transmitter location using TDOA(Time Difference of Arrival) and
FDOA(Frequency Difference of Arrival) of two satellites i
s introduced in this paper. Then, the Cramer-Rao Lower Bound (CRLB) for the loca
tion accuracy is studied. In the CRLB, the factors such as the estimation accura
cy of positioning parameters, the ephemeris, the position of transmitter and the
carrier frequency are analysed. The physical explanations are also given. Simul
ations show the consistance between location accuracy change trend and CRLB and
also
confirm the correctness of theoretical analysis. |
| Key words: dual-satellite geolocation TDOA/FDOA parameter measurement error location error Cramer-Rao lower bounds |
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