GPS軟件接收機基帶信號處理單元的關鍵技術研究與實現(xiàn)
發(fā)布時間：2018-10-25 20:28
【摘要】：GPS全球衛(wèi)星定位系統(tǒng)因其在海、陸空三大領域的全球性、全天候、實時的提供導航定位服務而成為全球?qū)Ш叫l(wèi)星系統(tǒng)中的佼佼者，同時也是全球科研機構炙手可熱的研究對象。GPS產(chǎn)品不斷擴大的市場需求和其穩(wěn)定、強大的功能使各國不斷致力于對GPS導航定位算法及應用平臺的開發(fā)與研究，其中，對于GPS信號捕獲方法的研究尤其顯得必要。傳統(tǒng)的GPS信號捕獲方法在捕獲時間和資源消耗及電路復雜度上始終不能兩全其美，而GPS信號的捕獲又對其后的定位工作有著直接的影響，因而設計一種簡單快速的GPS信號捕獲方法顯得尤為重要。 本課題主要完成的工作是對GPS軟件接收機的基帶信號處理單元中的信號捕獲部分提出一種新的簡單快速的捕獲方法，同時對GPS信號的跟蹤、數(shù)據(jù)解析、定位解算等部分進行研究，，并且在基于FPGA+DSP的硬件平臺上進行實現(xiàn)。該接收機的基帶信號處理單元中的信號捕獲部分能夠?qū)鹘y(tǒng)捕獲方法中的時間消耗和資源消耗減少同時能夠完成GPS信號的快速捕獲，在1ms積分時間內(nèi)能得到一個多普勒頻率下的1023個碼相位對應的相關值。在載波跟蹤部分使用四相鎖頻環(huán)和Costas環(huán)相結合的載波跟蹤環(huán)路對載波實現(xiàn)跟蹤調(diào)整，能夠同時滿足高動態(tài)的運動模式和低信噪比的載波跟蹤捕獲。此外，對捕獲到的GPS信號進行數(shù)據(jù)解調(diào)，根據(jù)解調(diào)出的數(shù)據(jù)可以確定接收機位置。 將由天線接收到的信號進行濾波、混頻、AD轉(zhuǎn)換等一系列操作后變?yōu)?位數(shù)字信號進行相關處理。其中，通過Verilog HDL語言編程，實現(xiàn)GPS信號的復相位旋轉(zhuǎn)數(shù)字下變頻和C/A碼的捕獲，通過C編程實現(xiàn)GPS信號捕獲后的載波跟蹤、數(shù)據(jù)解調(diào)及定位解算設計工作。此時，整個GPS信號基帶信號處理單元的工作基本完成，將該設計在現(xiàn)有的基于FPGA+DSP的硬件平臺上進行驗證實現(xiàn)并通過上位機顯示衛(wèi)星的捕獲跟蹤狀況，實時的對各衛(wèi)星的狀態(tài)進行監(jiān)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.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4
本文編號：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.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228.4
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