文档介绍：优秀设计
摘要
在全国大力发展北斗卫星系统的大环境下,研究北斗卫星的精确定位方法成为热门。本文重点介绍了一种在北斗卫星的先进的三频信号的基础上进行的载波相位模糊度解算的CIR方法。在保证精度的同时,简单快速地进行运算。
本文所做的工作主要有四个方面:
1、进行北斗三频载波相位最优组合的求解。使用函数极限的原理进行载波组合的解算,给出了理论推导,并选择了诸多优秀的载波组合,为CIR算法提供了理论基础。
2、进行基于北斗系统的三频模糊度解算的编程实现。运用CIR算法,在matlab平台上进行编程,主要功能包括读取rinex 、解算卫星轨道位置、单点定位求近似坐标以及用三频载波双差模糊度求解短基线向量。程序是基于GPS的程序进行调整、新增,以便完成上述功能。
3、运用程序处理北斗数据,实际进行运算,采集获得基线向量的结果,比较精度。数据处理要保证在数据正确的情况下进行,结果要进行检验。
4、由CIR算法分析每一步的误差传递,选取优秀的伪距组合、相位组合,通过数据处理结果,证实算法的可行性。
本文的前提条件是中短基线向量,因此,双差后忽略了大气延迟的影响,而长基线应当考虑在内,并且对于所得定位结果的X、Y、Z轴分量变化趋势本文没有进行研究。今后研究的重点将针对以上不足,完善理论,优化程序,加强功能。
关键词:卫星导航定位;北斗;模糊度;三频;CIR
ABSTRACT
In the environment of the country developing the Beidou satellitesystem rapidly,the research about Beidou satellite precise positioninghas e hot. This article focuses on an advanced tri- frequency signal on the basis of the Beidou satellite carrier Integer ambiguity resolution CIR. Operator need be simple and quick while ensuring the accuracy.
I work mainly in four aspects:
solves the bination of carrier the principle of limit of a function solves binations. Theoretical derivation is given and binations has been chose.
article programs and achieves tri-frequency integer ambiguity resolution based Beidou system. Using CIR algorithm,I encode in matlab platform. puter programs have some functions,which include reading rinex format data, solving satellites’ orbits,single-point position getting the approximate coordinates and striking short baseline vectors with solving the double difference carrier ambiguity of tri-frequency.
PASS data,I conduct the actual operations. The end result is the base- line vector, comparing precision. During data processing,ensure that the data is correct in the case. The results should be tested.
binations of the first step in the algorithm of the CIR are analysised to calculate error propagation at each I select the bination of pseudorange and phase ,confirming its feasibility with the res