北斗短基线双天线旋转快速定向方法

Fast orientation method by BeiDou short baseline dual-antennas rotation

针对无人运载器的快速定向需求,提出北斗双天线基线连续旋转整周和0°~180°两位置的两种快速定向方法。把一对北斗天线安装在一个旋转机构上,使双天线基线绕旋转机构中心轴转动,改变北斗双天线基线方向,运用卫星载波相位双差模型,计算出载波相位双差的整周模糊度,进而获得双天线基线航向角,通过旋转机构角度输出值,得到载体的真实航向。采用自行研制的旋转试验装置,验证了北斗短基线双天线两种旋转定向方法。对于0.3m北斗短基线双天线,载体定向精度优于1°。当北斗双天线接收机能够接收到4颗卫星时,上述两种方法都能够确定真实航向。与商业OEM定向板卡相比,所提出的定向方法定向速度快,定向精度高。

For the demand of fast orientation for the unmanned vehicle, two fast orientation methods for Beidou short baseline are proposed, which are dual-antenna continuous rotation method and 0°-180°two-position rotation method. A pair of Beidou antennas is installed on the rotating mechanism to rotate the two antenna bases around the central axis of the rotating mechanism to change the direction of the Beidou dual antennas baseline. The satellite carrier phase double-difference model is used to calculate the integer ambiguities of the carrier phase double-difference to obtain the heading of dual antennas baseline. The real heading of the carrier is obtained through the angle output value of the rotary mechanism. A self-developed rotating test device is used to verify the two dual-antenna rotation orientation methods with Beidou short baseline. For the Beidou dual-antenna with 0.3m short baseline, the accuracy of heading is better than 1 o. When Beidou dual-antenna receiver can receive 4 satellites, both of the above methods can determine the real course. Compared with the method using commercial OEM orientation board, the proposed orientation method has faster orientation speed and higher orientation accuracy.