高动态卫星信号模拟器四阶相位合成器设计  

Design of Fourth-Order Phase Synthesizer for Highly Dynamic GNSS Simulator

作　　者：范志良[1] 刘光斌[1] 张博[1] 焦巍[2] 

机构地区：[1]第二炮兵工程大学控制工程学院,西安710025 [2]第二炮兵装备研究院,北京100085

出　　处：《宇航学报》2013年第4期552-558,共7页Journal of Astronautics

基　　金：国家自然科学基金(61174030);国家高技术研究发展计划(863计划)(2011AA7053016)

摘　　要：为实现北斗二号导航系统卫星信号模拟器产生的信号对高动态条件下载体特征的准确表示,设计了一种四阶相位合成器。理论分析了由量化误差引起合成器各阶次状态间的误差传递效应,提出了非对称结构的优化设计,以平衡各阶次状态误差对最终相位状态的贡献权值;对非对称合成器进行合理的线性化近似,构建状态偏差平方和的目标函数,并给出了使其最小条件下求解各阶控制量最优值的方法。最后对高动态仿真信号进行捕获跟踪分析,结果表明该合成器合成信号的等效伪距和速度精度可分别达到10-3m和10-4m/s,优于低阶相位合成器的精度;并通过对比实验,验证了合成器量化位数对合成精度的影响。In order to express highly dynamic characteristic of signals generated by COMPASS simulator exactly,a fourth-order phase synthesizer is designed.By analyzing the transitive relations among all order states deviation caused by quantization errors,an asymmetrical synthesizer is proposed to balance the contribution weights of the final phase errors aroused by different order states.After linearizing the asymmetrical synthesizer and establishing an objective function of quadratic sum of all states deviations,an optimal method is developed to obtain an optimum solution for all order controlled quantities by minimizing the established objective function.Finally,through acquisition and tracking analysis of the highly dynamic simulated signals,it is found that the accuracy of the pseudo-range and velocity of the synthesized signals can arrive at 10-3m and 10-4m/s,respectively,and are better than those from low-order synthesizer.The quantization effect on the synthesized accuracy is also verified at last.

关 键 词：北斗二号导航系统 相位合成 高动态 最优控制 

分 类 号：TN967.1[电子电信—信号与信息处理]