雙頻GPS接收機(jī)基帶算法研究
發(fā)布時間：2018-11-19 09:21
【摘要】：輸油管道是石油、天然氣的主要運(yùn)輸渠道，承擔(dān)著能源運(yùn)輸?shù)闹卮筘?zé)任。管道遍布全國各地，其安全形勢是管道公司、各級政府部門、社會各階層關(guān)注的焦點(diǎn)。然而由于地質(zhì)災(zāi)害或是人為破壞，輸油管道發(fā)生沉降、移位甚至斷裂的情況時有發(fā)生，對輸油管道的異常位移檢測就顯得非常必要。 近年來，全球定位系統(tǒng)（GPS, Global Position System）在位移監(jiān)測領(lǐng)域的應(yīng)用獲得了巨大成功，其不受氣候影響、全天候自動測量以及精度高的特點(diǎn)是傳統(tǒng)監(jiān)測方式所無法比擬的。位移監(jiān)測領(lǐng)域?qū)﹄p頻GPS接收機(jī)的需求量大，但高精度雙頻GPS接收機(jī)技術(shù)被歐美幾家公司壟斷，我國長期依賴進(jìn)口，其成本嚴(yán)重制約了GPS在集輸管道位移監(jiān)測領(lǐng)域的應(yīng)用。 GPS雙頻接收機(jī)實現(xiàn)的難度主要在對于L2頻段信號的跟蹤，受美國國防部AS政策的影響，L2頻段信號只有加密的P(Y)碼，跟蹤難度較大。從1999開始的GPS現(xiàn)代化計劃中重要的一項為在L2頻段信號加入民用L2C碼，L2C信號的出現(xiàn)使利用L2頻段信號的難度大大降低。 本文研究對象為雙頻GPS接收機(jī)基帶算法，研究了GPS信號組成及其特點(diǎn)，分析了GPS信號捕獲算法，，根據(jù)L1C/A信號的特點(diǎn)，成功捕獲L1C/A信號。闡明了傳統(tǒng)捕獲算法不適用于L2C信號，通過對傳統(tǒng)捕獲算法的改進(jìn)，提出了L1C/A信號輔助CM碼捕獲法、CM碼輔助CL碼捕獲法、CM碼折疊捕獲法和CL碼折疊捕獲法，并利用仿真信號驗證了捕獲算法。分析了鎖相環(huán)、延遲鎖定環(huán)原理，設(shè)計了二階鎖相環(huán)與二階延遲鎖定環(huán)組成的GPS信號跟蹤環(huán)路，利用本文捕獲環(huán)節(jié)所得到的PRN碼相位和載波頻率估計值，成功跟蹤L1C/A信號和L2C信號，實現(xiàn)了雙頻GPS接收機(jī)基帶算法。
[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.
【學(xué)位授予單位】：中國石油大學(xué)（華東）
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P228.4
本文編號：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.
【學(xué)位授予單位】：中國石油大學(xué)（華東）
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：P228.4
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