一种改进的TCAR算法研究

Research on an Improved TCAR Algorithm

分析影响TCAR成功率的主要因素,在此基础上给出了改进TCAR的方案。一是从组合方式着手,舍弃了超宽巷到宽巷再到窄巷的固定模式,在分析影响TCAR的因素的基础上,探究TCAR中组合的选择原则,并且分别给出短基线与中长基线的推荐组合;二是采用平滑窗口对观测噪声引起的误差进行平滑,削弱了观测噪声的影响,从而提高了模糊度固定的成功率;三是针对中长基线电离层误差问题,采用两组组合观测值估计电离层误差,用于下一步固定电离层误差的修正,从而提高了下一步固定的成功率。

The influence elements of TCAR success rate are analyzed and several improved schemes are proposed.From the combination modes,the fix mode from extra-wide lane to wide lane and to narrow lane is abandoned and based on the analysis of influence elements of TCAR,the selection rules of the combinations of TCAR are discussed,several recommended combinations are picked out for short baselines and middle-long baselines respectively.The smoothing window technique is introduced to smooth the error caused by observation noise and weaken the influence of observation noise,which increases the success rate of ambiguity of TCAR.Aiming at the problem of ionosphere error for middle-long baselines,a method uses the two combinations of observations to estimate ionosphere error and correct the fixed ionosphere error in the next step,which increases the its success rate.