双频GPS接收机基带算法研究
发布时间：2018-11-19 09:21
【摘要】：输油管道是石油、天然气的主要运输渠道，承担着能源运输的重大责任。管道遍布全国各地，其安全形势是管道公司、各级政府部门、社会各阶层关注的焦点。然而由于地质灾害或是人为破坏，输油管道发生沉降、移位甚至断裂的情况时有发生，对输油管道的异常位移检测就显得非常必要。 近年来，全球定位系统（GPS, Global Position System）在位移监测领域的应用获得了巨大成功，其不受气候影响、全天候自动测量以及精度高的特点是传统监测方式所无法比拟的。位移监测领域对双频GPS接收机的需求量大，但高精度双频GPS接收机技术被欧美几家公司垄断，我国长期依赖进口，其成本严重制约了GPS在集输管道位移监测领域的应用。 GPS双频接收机实现的难度主要在对于L2频段信号的跟踪，受美国国防部AS政策的影响，L2频段信号只有加密的P(Y)码，跟踪难度较大。从1999开始的GPS现代化计划中重要的一项为在L2频段信号加入民用L2C码，L2C信号的出现使利用L2频段信号的难度大大降低。 本文研究对象为双频GPS接收机基带算法，研究了GPS信号组成及其特点，分析了GPS信号捕获算法，，根据L1C/A信号的特点，成功捕获L1C/A信号。阐明了传统捕获算法不适用于L2C信号，通过对传统捕获算法的改进，提出了L1C/A信号辅助CM码捕获法、CM码辅助CL码捕获法、CM码折叠捕获法和CL码折叠捕获法，并利用仿真信号验证了捕获算法。分析了锁相环、延迟锁定环原理，设计了二阶锁相环与二阶延迟锁定环组成的GPS信号跟踪环路，利用本文捕获环节所得到的PRN码相位和载波频率估计值，成功跟踪L1C/A信号和L2C信号，实现了双频GPS接收机基带算法。
[Abstract]:Oil pipeline is the main transportation channel of oil and natural gas, which bears the great responsibility of energy transportation. Pipeline all over the country, its safety situation is pipeline companies, government departments at all levels, social strata focus. However, due to geological hazards or man-made damage, oil pipeline subsidence, displacement and even fracture occur from time to time, the abnormal displacement detection of oil pipeline is very necessary. In recent years, the application of global positioning system (GPS, Global Position System) in the field of displacement monitoring has achieved great success. It is not affected by climate, the characteristics of all-weather automatic measurement and high accuracy are unparalleled by the traditional monitoring methods. There is a large demand for dual-frequency GPS receivers in the field of displacement monitoring, but the technology of high-precision dual-frequency GPS receivers is monopolized by several companies in Europe and America, and our country relies on imports for a long time. Its cost seriously restricts the application of GPS in the field of displacement monitoring of gathering and transportation pipelines. The difficulty of GPS dual-frequency receiver is to track the L2 band signal. Under the influence of the AS policy of the US Department of Defense, the L2 band signal has only encrypted P (Y) code, which is difficult to track. One of the important items in the GPS modernization plan from 1999 is to add civil L2C code to the L2 band signal. The L2C signal appears to greatly reduce the difficulty of using L2 band signal. In this paper, the base-band algorithm of dual-frequency GPS receiver is studied. The composition and characteristics of GPS signal are studied, and the acquisition algorithm of GPS signal is analyzed. According to the characteristics of L1C/A signal, the L1C/A signal is successfully captured. This paper illustrates that the traditional acquisition algorithm is not suitable for L2C signal. Through the improvement of the traditional acquisition algorithm, the paper proposes the L1C/A signal aided CM code acquisition method, the CM code aided CL code acquisition method, the CM code folding acquisition method and the CL code folding acquisition method. The acquisition algorithm is verified by simulation signal. The principle of phase-locked loop (PLL) and delay-locked loop (DLL) are analyzed. A GPS signal tracking loop is designed, which is composed of a second-order PLL and a second-order delay-locked loop. The phase and carrier frequency estimates of PRN codes obtained from the acquisition link are used in this paper. The L1C/A signal and L 2C signal are tracked successfully, and the baseband algorithm of dual frequency GPS receiver is realized.
【学位授予单位】：中国石油大学（华东）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
本文编号：2341852
[Abstract]:Oil pipeline is the main transportation channel of oil and natural gas, which bears the great responsibility of energy transportation. Pipeline all over the country, its safety situation is pipeline companies, government departments at all levels, social strata focus. However, due to geological hazards or man-made damage, oil pipeline subsidence, displacement and even fracture occur from time to time, the abnormal displacement detection of oil pipeline is very necessary. In recent years, the application of global positioning system (GPS, Global Position System) in the field of displacement monitoring has achieved great success. It is not affected by climate, the characteristics of all-weather automatic measurement and high accuracy are unparalleled by the traditional monitoring methods. There is a large demand for dual-frequency GPS receivers in the field of displacement monitoring, but the technology of high-precision dual-frequency GPS receivers is monopolized by several companies in Europe and America, and our country relies on imports for a long time. Its cost seriously restricts the application of GPS in the field of displacement monitoring of gathering and transportation pipelines. The difficulty of GPS dual-frequency receiver is to track the L2 band signal. Under the influence of the AS policy of the US Department of Defense, the L2 band signal has only encrypted P (Y) code, which is difficult to track. One of the important items in the GPS modernization plan from 1999 is to add civil L2C code to the L2 band signal. The L2C signal appears to greatly reduce the difficulty of using L2 band signal. In this paper, the base-band algorithm of dual-frequency GPS receiver is studied. The composition and characteristics of GPS signal are studied, and the acquisition algorithm of GPS signal is analyzed. According to the characteristics of L1C/A signal, the L1C/A signal is successfully captured. This paper illustrates that the traditional acquisition algorithm is not suitable for L2C signal. Through the improvement of the traditional acquisition algorithm, the paper proposes the L1C/A signal aided CM code acquisition method, the CM code aided CL code acquisition method, the CM code folding acquisition method and the CL code folding acquisition method. The acquisition algorithm is verified by simulation signal. The principle of phase-locked loop (PLL) and delay-locked loop (DLL) are analyzed. A GPS signal tracking loop is designed, which is composed of a second-order PLL and a second-order delay-locked loop. The phase and carrier frequency estimates of PRN codes obtained from the acquisition link are used in this paper. The L1C/A signal and L 2C signal are tracked successfully, and the baseband algorithm of dual frequency GPS receiver is realized.
【学位授予单位】：中国石油大学（华东）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
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