一种改进的双频单P码周跳探测与修复方法

IMPROVED METHOD FOR DETECTING AND REPAIRING CYCLE SLIPS OF DUAL-FREQUENCY DATA WITH SINGLE P-CODE

由于目前绝大多数接收机均很难获取精密P码,仅能获取L2频率上的交叉相关P码,因此经典的双频单P码相位/伪距组合(1,-1)、(-7,9)对周跳的探测和修复能力均明显减弱。针对这一问题,提出了一种顾及伪距多路径效应变化的双频单P码周跳探测与修复方法,该方法可实时消除伪距中多路径效应的历元间变化,解决了传统方法在修复周跳时噪声较大的问题。试验表明,新方法中历元间的宽巷变化在1周的分辨率水平,修复周跳的效率和可靠性有较大提高。

As is known, it is not an easy thing to capture the precise P-code for most of the receivers and on- ly the cross correlated P-code could be derived. With such cross correlated P-Code, the detecting and repairing capability of the traditional combinations, the （1, -1 ） and （-7,9）, will be out of one cycle level. To resolve the problem, an improved method which takes the multipath effect of the pseudo range into account is proposed to upgrade the cycle slip repairing capability of the aforementioned combinations. The experiment shows that the new method can remove the epoch-wise multipath effect of the pseudo range and repaire successfully cycle slip within one cycle level.