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本文提出了一种新的姿态敏感器,它由安装在转台上的一全球定位系统(GPS)天线组成,该天线的相位中心偏离转台的转轴。它是一种敏感三轴姿态信息的手段。它的GPS接收机的通道数很少,因此比较小,并且功耗低,故很有吸引力。该系统通过解调GPS载波相位的周期振荡来敏感姿态。这种振荡是转台转动引起的,而振荡的幅值和相位取决于到被跟踪的GPS卫星的方向矢量。本文详细描述了这个系统,设计了解调锁相回路,分析并通过仿真来进行评估性能。计算机仿真结果表明,当转台半径为0.1m、转动速率为4000rpm、而且接收时钟利用有恒温槽的晶体振荡器时,则该系统可以带宽0.64Hz敏感矢量姿态,1σ精粒度为1.4°。增大转台半径或减少多路径反射可提高其精度。
This paper presents a new attitude sensor consisting of a Global Positioning System (GPS) antenna mounted on a turntable with its phase center deviating from the axis of rotation of the turntable. It is a means of sensitive triaxial attitude information. Its GPS receiver has a small number of channels, so it is smaller and consumes less power, making it attractive. The system is sensitive to attitude by demodulating the periodic oscillations of the GPS carrier phase. This oscillation is caused by turntable rotation, and the magnitude and phase of the oscillation depend on the direction vector to the GPS satellite being tracked. This article describes the system in detail, designed to unlock the PLL, analyze and simulate to evaluate performance. Computer simulation results show that when the radius of the turntable is 0.1m and the rotation rate is 4000rpm, and the receiving clock uses a crystal oscillator with constant temperature bath, the system can have a bandwidth of 0.64Hz with a sensitive vector attitude and the precision of 1σ is 1.4 °. Increasing the turn table radius or reducing multipath reflections improves accuracy.