高精度时差/频差测量在双站定位中的应用

Application of High Precision TDOA and FDOA Measurement Technique in Dual-station Location System

对双站时差/频差定位系统进行了理论分析并推导了定位误差几何稀释精度(GDOP)的表达式,针对雷达信号提出了基于相位内插法高精度测时差和相参脉冲积累法高精度测频差的新方法及实现途径,分析了影响测量精度的因素,实验室仿真及测试结果表明:文中2种方法对应的时差及频差的测量精度可达到纳秒及赫兹量级,可以满足双站高精度定位的要求。

Dual-station location system is theoretically analysed and the expression for Geometric Dilution of Precision （GDOP） is derived in this paper. Respectively, a high accuracy Time Differerice of Arrival（TDOA） measurement method based on phase interpolation and a high accuracy Frequency Difference of Arrival（FDOA） measurement method based on coherent pulse accumulation of radar signal are proposed and ways to implement them are suggested, too. Factors that affect the measurement precision are analysed. Simulation and laboratory test results indicated that the precision of the TDOA and FDOA estimation results can be achieved at ns-level and Hz-level respectively. The simulation results showed that the TDOA and FDOA measurement technique proposed in this paper may meet the requirement of high precision location of dual-station system.