RDSS动基线整周模糊度求解方法及仿真

A Motion-Based Method and Emulation of RDSS Integer Ambiguity

提出了一种利用动基线求解卫星无线电测定业务RDSS(Radio Determination Satellite Service)定向技术中单差整周模糊度的方法。接收机首先在基线处于某一初始状态下测量两颗卫星的载波相位单差,然后旋转基线两个较小角度,并分别测量不同状态下两颗卫星的载波相位单差。通过两次旋转获得的各基线状态之间的关系获得旋转平面,进而求得初始状态下的基线矢量。将求得的基线矢量初值代入单差观测方程可求得整周模糊度。整周模糊度的求解精度与基线长度、基线初始状态方位角以及基线转角等多种因素有关。仿真分析表明,当基线长度为3 m,基线两次旋转角度分别为30°,基线初始状态方位角在(0°,120°)和(180°,300°)范围内时,都可以正确求解整周模糊度。

A new motion-based method is presented in this article,which can be used to determine the RDSS difference phase ambiguities.First,the receiver measures the difference phase of the two satellites at a certain state.Second,rotate the baseline two times and measure the difference phase at each state.According to the relationships among the baseline vectors the whirling plane can be determined,and then the initial baseline vector can be work out.If the known baseline is put into the difference phase equations,the ambiguities can be obtained.The precision of ambiguity relate to some factors,such as the baseline length,the azimuth of the initial state and the angles of rotations etc.The conclusion can be drawn by the Monte Carlo method that the accurate ambiguity can be gained under the conditions that the initial azimuth is in the regions（0°,120°）and（180°,300°）,when the baseline length is 3 meters and the rotation angles are both 30°.