GPS软件接收机基带信号处理单元的关键技术研究与实现
发布时间：2018-10-25 20:28
【摘要】：GPS全球卫星定位系统因其在海、陆空三大领域的全球性、全天候、实时的提供导航定位服务而成为全球导航卫星系统中的佼佼者，同时也是全球科研机构炙手可热的研究对象。GPS产品不断扩大的市场需求和其稳定、强大的功能使各国不断致力于对GPS导航定位算法及应用平台的开发与研究，其中，对于GPS信号捕获方法的研究尤其显得必要。传统的GPS信号捕获方法在捕获时间和资源消耗及电路复杂度上始终不能两全其美，而GPS信号的捕获又对其后的定位工作有着直接的影响，因而设计一种简单快速的GPS信号捕获方法显得尤为重要。 本课题主要完成的工作是对GPS软件接收机的基带信号处理单元中的信号捕获部分提出一种新的简单快速的捕获方法，同时对GPS信号的跟踪、数据解析、定位解算等部分进行研究，，并且在基于FPGA+DSP的硬件平台上进行实现。该接收机的基带信号处理单元中的信号捕获部分能够将传统捕获方法中的时间消耗和资源消耗减少同时能够完成GPS信号的快速捕获，在1ms积分时间内能得到一个多普勒频率下的1023个码相位对应的相关值。在载波跟踪部分使用四相锁频环和Costas环相结合的载波跟踪环路对载波实现跟踪调整，能够同时满足高动态的运动模式和低信噪比的载波跟踪捕获。此外，对捕获到的GPS信号进行数据解调，根据解调出的数据可以确定接收机位置。 将由天线接收到的信号进行滤波、混频、AD转换等一系列操作后变为8位数字信号进行相关处理。其中，通过Verilog HDL语言编程，实现GPS信号的复相位旋转数字下变频和C/A码的捕获，通过C编程实现GPS信号捕获后的载波跟踪、数据解调及定位解算设计工作。此时，整个GPS信号基带信号处理单元的工作基本完成，将该设计在现有的基于FPGA+DSP的硬件平台上进行验证实现并通过上位机显示卫星的捕获跟踪状况，实时的对各卫星的状态进行监控。
[Abstract]:GPS Global Positioning system (GPS) has become a leader in GNSS because of its global, all-weather, real-time navigation and positioning services in the sea, land and air. At the same time, it is also a hot research object of global scientific research institutions. The expanding market demand and its stability of GPS products make all countries devote themselves to the development and research of GPS navigation and positioning algorithms and application platforms. The research of GPS signal acquisition method is especially necessary. The traditional method of GPS signal acquisition can not be used both ways in terms of acquisition time, resource consumption and circuit complexity. However, the acquisition of GPS signal has a direct impact on the subsequent positioning work. So it is very important to design a simple and fast GPS signal acquisition method. The main work of this thesis is to propose a new simple and fast acquisition method for the signal acquisition in the baseband signal processing unit of the GPS software receiver. At the same time, the GPS signal is tracked and analyzed. The location solution and other parts are studied and implemented on the hardware platform based on FPGA DSP. The signal acquisition section in the baseband signal processing unit of the receiver can reduce the time consumption and the resource consumption in the traditional acquisition method and can complete the fast acquisition of the GPS signal at the same time. The correlation values corresponding to 1023 code phases at a Doppler frequency can be obtained in 1ms integral time. In the part of carrier tracking, the carrier tracking loop combined with four-phase frequency locking loop and Costas loop is used to track and adjust the carrier, which can satisfy both the high dynamic motion mode and the low signal-to-noise ratio of the carrier tracking acquisition. In addition, the captured GPS signal is demodulated and the receiver position can be determined according to the demodulated data. The signals received by the antenna are filtered, mixed, and converted into 8-bit digital signals for correlation processing after a series of operations. Among them, the complex phase rotation digital down-conversion and C / A code acquisition of GPS signal are realized by Verilog HDL programming language, and the carrier tracking, data demodulation and positioning solution of GPS signal are realized by C programming. At this point, the work of the whole GPS signal baseband signal processing unit is basically completed, and the design is verified on the existing hardware platform based on FPGA DSP and the acquisition and tracking status of the satellite is displayed by the upper computer. Monitor the state of each satellite in real time.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
本文编号：2294754
[Abstract]:GPS Global Positioning system (GPS) has become a leader in GNSS because of its global, all-weather, real-time navigation and positioning services in the sea, land and air. At the same time, it is also a hot research object of global scientific research institutions. The expanding market demand and its stability of GPS products make all countries devote themselves to the development and research of GPS navigation and positioning algorithms and application platforms. The research of GPS signal acquisition method is especially necessary. The traditional method of GPS signal acquisition can not be used both ways in terms of acquisition time, resource consumption and circuit complexity. However, the acquisition of GPS signal has a direct impact on the subsequent positioning work. So it is very important to design a simple and fast GPS signal acquisition method. The main work of this thesis is to propose a new simple and fast acquisition method for the signal acquisition in the baseband signal processing unit of the GPS software receiver. At the same time, the GPS signal is tracked and analyzed. The location solution and other parts are studied and implemented on the hardware platform based on FPGA DSP. The signal acquisition section in the baseband signal processing unit of the receiver can reduce the time consumption and the resource consumption in the traditional acquisition method and can complete the fast acquisition of the GPS signal at the same time. The correlation values corresponding to 1023 code phases at a Doppler frequency can be obtained in 1ms integral time. In the part of carrier tracking, the carrier tracking loop combined with four-phase frequency locking loop and Costas loop is used to track and adjust the carrier, which can satisfy both the high dynamic motion mode and the low signal-to-noise ratio of the carrier tracking acquisition. In addition, the captured GPS signal is demodulated and the receiver position can be determined according to the demodulated data. The signals received by the antenna are filtered, mixed, and converted into 8-bit digital signals for correlation processing after a series of operations. Among them, the complex phase rotation digital down-conversion and C / A code acquisition of GPS signal are realized by Verilog HDL programming language, and the carrier tracking, data demodulation and positioning solution of GPS signal are realized by C programming. At this point, the work of the whole GPS signal baseband signal processing unit is basically completed, and the design is verified on the existing hardware platform based on FPGA DSP and the acquisition and tracking status of the satellite is displayed by the upper computer. Monitor the state of each satellite in real time.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4
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本文编号：2294754
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