本文選題：TMBOC　切入點：高動態(tài)　出處：《電子科技大學》2014年碩士論文

【摘要】：衛(wèi)星導航系統(tǒng)是目前被應用于各行各業(yè)的焦點項目,世界各國都在積極組建屬于自己的獨立自主衛(wèi)星導航系統(tǒng)。目前,全球的衛(wèi)星導航系統(tǒng)包括GPS系統(tǒng)、伽利略系統(tǒng)、GLONASS系統(tǒng)以及中國的北斗導航系統(tǒng),它們在定位、導航等各項領域發(fā)揮著重要的作用,服務于全球各個國家的軍事和人民的生活當中。在高動態(tài)環(huán)境下,載體的高速度、高加速度以及高加加速度引起的多普勒頻移給導航信號的捕獲、跟蹤和定位帶來了極大的挑戰(zhàn),這一直是接收機算法研究中關注的問題。本文主要是針對高動態(tài)環(huán)境下,研究TMBOC調制體制下跟蹤環(huán)路的設計方法,研究和實現穩(wěn)定消除動態(tài)的跟蹤算法,然后對具體的算法進行了MATLAB仿真驗證和誤差分析。本文分別介紹了GPS系統(tǒng)的定位原理以及TMBOC調制方式的原理,提出高動態(tài)環(huán)境下載波跟蹤環(huán)在跟蹤時會產生多普勒頻移變化的問題,分析高動態(tài)對跟蹤環(huán)路造成的影響。在此基礎上,對該課題作以下幾個方面的研究:(1)詳細介紹了一種典型的高動態(tài)模型和信號模型,并對其速度、加速度及加加速度作了仿真結果展示,并建立了接收信號的高動態(tài)數學模型。(2)闡述了信號跟蹤環(huán)路中載波跟蹤環(huán)路及碼跟蹤環(huán)路的基本結構和算法,并對里面的具體模塊算法進行了詳細的分析,并對其測量誤差進行了理論推導和仿真驗證。(3)由于基于傳統(tǒng)鎖相環(huán)或鎖頻環(huán)技術的載波跟蹤方案中所使用的相位或頻率鑒別器和環(huán)路濾波器都不是基于最優(yōu)準則而設計的,因此環(huán)路性能受到很大限制。在高動態(tài)環(huán)境下,導航衛(wèi)星和導航接收機就地面而言的相對運動不穩(wěn)定,導航接收信號的載波多普勒多頻變化范圍較大,當多普勒頻移超出一定的范圍的時候,鎖頻環(huán)路無法對信號載波頻率進行多頂,這時候就需要一個輔助模塊進行牽引,由于四項鑒頻器能把±250 Hz頻差牽引到±10左右的Hz范圍內,那么本設計在信號載波多普勒頻移較大時候,鎖頻環(huán)的鑒頻器算法采用四項鑒頻器,之后再對鎖相結果進行三階鎖相環(huán)處理,最后在載波輔助的情況下進入碼環(huán)路跟蹤。
[Abstract]:At present, satellite navigation system is the focus of application in various industries. Every country in the world is actively building its own independent satellite navigation system.At present, the global satellite navigation system includes GPS system, Galileo system GLONASS system and China's Beidou navigation system, which play an important role in various fields, such as positioning, navigation, etc.To serve the military and the lives of the people of all countries around the world.In the high dynamic environment, the Doppler frequency shift caused by high velocity, high acceleration and high acceleration brings great challenges to the acquisition, tracking and positioning of navigation signals, which has always been a concern in the research of receiver algorithms.In this paper, the design method of tracking loop in TMBOC modulation system is studied, and the tracking algorithm to eliminate the dynamic stability is studied and realized. Then, the MATLAB simulation and error analysis are carried out for the specific algorithm.In this paper, the positioning principle of GPS system and the principle of TMBOC modulation are introduced, and the Doppler frequency shift of carrier tracking loop in high dynamic environment is put forward, and the influence of high dynamic on tracking loop is analyzed.On this basis, a typical high dynamic model and signal model are introduced in detail, and the simulation results of velocity, acceleration and acceleration are presented.The structure and algorithm of carrier tracking loop and code tracking loop in signal tracking loop are described, and the specific module algorithms are analyzed in detail.The measurement error is theoretically deduced and verified by simulation. (3) because the phase or frequency discriminator and loop filter used in the carrier tracking scheme based on the traditional phase-locked loop or frequency-locked loop technology are not based on the optimal criteria.Therefore, the loop performance is greatly limited.In the high dynamic environment, the relative motion of navigation satellite and navigation receiver is unstable on the ground, and the carrier Doppler multi-frequency variation range of the navigation received signal is large, when the Doppler frequency shift exceeds a certain range,The frequency locked loop can't carry out multiple top of the carrier frequency of the signal. At this time, an auxiliary module is needed for traction, because the frequency difference of 鹵250 Hz frequency can be drawn to 鹵10 Hz range by the four frequency discriminators.In this design, when the carrier Doppler frequency shift is large, the frequency discriminator algorithm of the frequency locking loop adopts four discriminators, and then the phase-locked results are processed by the third-order phase-locked loop. Finally, the frequency identification algorithm of the frequency locking loop is followed by the code loop in the case of carrier assistance.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN967.1

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本文編號：1720409