摘要
研究了采用双基线方案测量载体的姿态，利用ＧＰＳ双差相位测量基线矢量，双差伪距观测值辅助解相位整周模糊，双频时引入空间变换缩小置信空间搜索次数，通过实例分析得出了正确解算相位模糊与观测次数、伪距测量精度的关系，并利用误差传播定律对姿态测量精度进行分析，结合卫星星历数据计算表明，在卫星运行周期内航向角和俯仰角平均测量精度在一定条件下优于２ｍｒａｄ。
The rigid body′s attitude determination is discussed using two baselines based on GPS; baseline vector coordinates are calculated with GPS double difference phases, and phase integer ambiguities are calculated with the aid of double difference pseudorange observables. By space transformation, the searching time of the integer ambiguity candidates in the confidence ellipsoid space can be reduced when dual frequency observables are available. Correctly resolving the integer ambiguities depends on the observed time and the observed pseudorange accuracy. Attitude precision is analyzed based on error propagation laws. Calculations with one periodic ephemerides data show that head or pitch precision level can reach about 2 mrads under certain conditions.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1998年第5期531-535,共5页
Acta Aeronautica et Astronautica Sinica
关键词
GPS
姿态测量
相位整周模糊
卫星导航
双基线
GPS, attitude determination, phase integer ambiguity, space transformation
