CAJ | 학술논문

精密单点定位可以实现厘米级的定位精度,但其实时应用受到模糊度收敛时间的限制,模糊度收敛一般需要30分钟甚至更长的时间.基于相位历元间差分技术,可以避免模糊度的求解,但求解的参数为历元间坐标差.在相位历元间差分技术基础之上,推导了无模糊度模型的快速静态单点定位模型,并通过岭估计理论来进行参数的求解,两个以上历元就可以解算得到位置参数,从而实现静态状态下单点的快速定位,克服了模糊度收敛时间的局限,并讨论了不同坐标初值情况下估计值的精度.
정밀단점정위가이실현전미급적정위정도,단기실시응용수도모호도수렴시간적한제,모호도수렴일반수요30분종심지경장적시간.기우상위역원간차분기술,가이피면모호도적구해,단구해적삼수위역원간좌표차.재상위역원간차분기술기출지상,추도료무모호도모형적쾌속정태단점정위모형,병통과령고계이론래진행삼수적구해,량개이상역원취가이해산득도위치삼수,종이실현정태상태하단점적쾌속정위,극복료모호도수렴시간적국한,병토론료불동좌표초치정황하고계치적정도.
Precise Point Positioning (PPP) has been reported to have a precision at centimeter level in static mode and at centimeter to decimeter level in kinematic mode. However, the application of PPP to real-time is still limited by its long convergence time, typically 30 minutes, which is necessary for the float carrier phase ambiguity resolution. The ambiguity free model of PPP can eliminate the initial phase ambiguities through epoch-difference of phase observations. However, this mode only estimates coordinate differences between two sequential epochs. Therefore, the station coordinates need to be derived with additional methods, e.g., combined with noised range observations. In this paper, based on the phase epoch-difference, a fast static PPP algorithm is developed, where parameters estimation is based on the ridged estimation. The coordinates can be estimated by observations only at two epochs, assuring the fast PPP. Using the 1 hour-data collected on the 295th day of 2007 in Tongji University, a test was carried out. Results show that the coordinate precision can be at centimeter to decimeter level when the initial values are different.