不同信号体制对GNSS定姿性能影响的分析

Performance analysis for GNSS-based attitude determination under different signal structure

摘要:

利用GNSS信号能够进行高精度的载体定姿,其算法性能受不同信号体制影响较大.针对这一问题,首先在GNSS单频单历元定姿算法数学模型的基础上,分析了算法性能与码和载波相位测量精度之间的关系,然后研究了不同信号体制对码和载波跟踪精度的影响,最后提出了评估信号体制对定姿性能影响的关键指标,并对其在不同信号体制下进行了仿真实验.仿真结果表明,该指标可以有效地评估不同信号体制下的定姿性能.

Abstract:

High precise attitude can be determined using GNSS signal,but the performance of GNSS-based attitude determination algorithm is affected by different signal structures.To deal this problem,first,the relationship between performance of algorithm and accuracy of code and carrier phase is analyzed based on the mathematical model of GNSS-based single frequency single epoch attitude determination algorithm,and then the effects of signal structures on the tracking accuracy of code and carrier phase are studied,finally the key indicator is presented to evaluate the effect of signal structures on the performance of attitude determination algorithm.The simulation results demonstrate that the indicator can evaluate the performance of attitude determination algorithm under different signal structure effectively while the conclusion is important for GNSS signal design and signal selection of receivers.