TMBOC信號(hào)的P碼直捕算法研究與實(shí)現(xiàn)
發(fā)布時(shí)間：2018-10-10 15:25
【摘要】：如今衛(wèi)星導(dǎo)航已是一個(gè)國(guó)家綜合實(shí)力的體現(xiàn),美國(guó)有GPS導(dǎo)航系統(tǒng),歐盟有Galileo導(dǎo)航系統(tǒng),俄羅斯有Glonass導(dǎo)航系統(tǒng),還有正在建設(shè)的我國(guó)的北斗導(dǎo)航系統(tǒng)。在現(xiàn)有的導(dǎo)航系統(tǒng)中,大多采用直接序列擴(kuò)頻(DSSS)工作方式,而偽隨機(jī)序列碼正是DSSS的關(guān)鍵。本課題主要就周期很長(zhǎng)的偽隨機(jī)序列碼即P碼進(jìn)行研究,P碼有其優(yōu)良的特點(diǎn),周期長(zhǎng),碼率高,使得在應(yīng)用中更難被敵方捕獲和解密,因此具有更高的保密性和抗干擾性,在軍事領(lǐng)域獲得了廣泛的應(yīng)用。常規(guī)的P碼捕獲均是以短周期碼(C碼)為基礎(chǔ),并結(jié)合P碼和C碼的關(guān)系進(jìn)而實(shí)現(xiàn)P碼的捕獲。這種捕獲方法看似比較簡(jiǎn)單而且容易實(shí)現(xiàn),但是其P碼的捕獲過(guò)多的依賴于短周期碼(C碼)的捕獲,極大的削弱了P碼所帶來(lái)的優(yōu)勢(shì),從而降低了其抗干擾性和保密性。本論文的目標(biāo)是為我國(guó)自主衛(wèi)星導(dǎo)航定位系統(tǒng)接收機(jī)設(shè)計(jì)在新的信號(hào)調(diào)制體制下(TMBOC信號(hào))的長(zhǎng)周期測(cè)距碼(P碼)直捕模塊,即不需要捕獲C碼,直接對(duì)P碼捕獲,為接收機(jī)信號(hào)跟蹤單元提供其碼相位和載波頻率的粗略估計(jì),提高衛(wèi)星導(dǎo)航系統(tǒng)在導(dǎo)航戰(zhàn)環(huán)境下的對(duì)抗能力。論文首先介紹了導(dǎo)航定位接收機(jī)的理論基礎(chǔ),即擴(kuò)頻通信理論。由此引申出本文所研究的擴(kuò)頻通信技術(shù)中最常見(jiàn)的一種即直接序列擴(kuò)頻通信系統(tǒng)(DSSS),并結(jié)合本論文的特點(diǎn),著重講述了TMBOC調(diào)制信號(hào)及長(zhǎng)周期測(cè)距碼(P碼)。然后概述了直擴(kuò)信號(hào)捕獲的基本模型和捕獲算法,并結(jié)合P碼長(zhǎng)周期的特點(diǎn),對(duì)比了幾種典型的P碼捕獲算法,在對(duì)其分析比較的基礎(chǔ)上選定基于FFT的頻域偽碼相位并行搜索和匹配濾波+FFT這兩種方法來(lái)實(shí)現(xiàn)P碼直捕模塊。隨后針對(duì)選定的兩種捕獲算法,在對(duì)其算法仿真的基礎(chǔ)上進(jìn)行FPGA的設(shè)計(jì)。文中詳細(xì)的給出了直捕模塊的總體結(jié)構(gòu)、單元子模塊的結(jié)構(gòu)、仿真結(jié)果及硬件消耗情況。最后,對(duì)整篇文章進(jìn)行總結(jié),提出今后可進(jìn)一步改善的地方。
[Abstract]:Nowadays, satellite navigation is the embodiment of a country's comprehensive strength. The United States has a GPS navigation system, the European Union has a Galileo navigation system, Russia has a Glonass navigation system, and the Beidou navigation system is under construction in China. In the existing navigation systems, direct sequence spread spectrum (DSS) (DSSS) is mostly used, and pseudorandom sequence code is the key of DSSS. This paper mainly studies the pseudorandom sequence code (P code) which has a very long period. P code has its excellent characteristics, long period and high code rate, which makes it more difficult to be captured and decrypted by the enemy in application, so it has higher confidentiality and anti-jamming. It has been widely used in military field. The conventional P code acquisition is based on short period code (C code), and the relation between P code and C code is combined to realize the acquisition of P code. This acquisition method seems to be simple and easy to implement, but the acquisition of P-code depends too much on the acquisition of short period code (C code), which greatly weakens the advantage brought by P-code and reduces its anti-jamming and confidentiality. The goal of this paper is to design a long period ranging code (P code) direct capture module for the receiver of autonomous satellite navigation and positioning system (TMBOC) under the new signal modulation system, that is, the acquisition of P code without the need to capture C code. For the receiver signal tracking unit, the rough estimation of the code phase and carrier frequency is provided to improve the countermeasure ability of the satellite navigation system in the navigation warfare environment. Firstly, the thesis introduces the theoretical basis of navigation and positioning receiver, that is, spread spectrum communication theory. Thus, one of the most common spread spectrum communication technologies studied in this paper is the direct sequence spread spectrum communication system (DSSS),). Combined with the characteristics of this paper, the TMBOC modulation signal and the long period ranging code (P code) are emphatically described. Then, the basic model and acquisition algorithm of DSS signal acquisition are summarized, and several typical P-code acquisition algorithms are compared according to the characteristics of P-code long period. On the basis of the analysis and comparison, two methods based on FFT are selected to realize P-code direct-trapping module: phase parallel search of frequency domain pseudo-code and matched filter FFT. Then the FPGA is designed based on the simulation of the two selected capture algorithms. In this paper, the overall structure of the direct capture module, the structure of the unit sub-module, the simulation results and the hardware consumption are given in detail. Finally, the article is summarized, and further improvement is put forward.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN967.1
本文編號(hào)：2262284
[Abstract]:Nowadays, satellite navigation is the embodiment of a country's comprehensive strength. The United States has a GPS navigation system, the European Union has a Galileo navigation system, Russia has a Glonass navigation system, and the Beidou navigation system is under construction in China. In the existing navigation systems, direct sequence spread spectrum (DSS) (DSSS) is mostly used, and pseudorandom sequence code is the key of DSSS. This paper mainly studies the pseudorandom sequence code (P code) which has a very long period. P code has its excellent characteristics, long period and high code rate, which makes it more difficult to be captured and decrypted by the enemy in application, so it has higher confidentiality and anti-jamming. It has been widely used in military field. The conventional P code acquisition is based on short period code (C code), and the relation between P code and C code is combined to realize the acquisition of P code. This acquisition method seems to be simple and easy to implement, but the acquisition of P-code depends too much on the acquisition of short period code (C code), which greatly weakens the advantage brought by P-code and reduces its anti-jamming and confidentiality. The goal of this paper is to design a long period ranging code (P code) direct capture module for the receiver of autonomous satellite navigation and positioning system (TMBOC) under the new signal modulation system, that is, the acquisition of P code without the need to capture C code. For the receiver signal tracking unit, the rough estimation of the code phase and carrier frequency is provided to improve the countermeasure ability of the satellite navigation system in the navigation warfare environment. Firstly, the thesis introduces the theoretical basis of navigation and positioning receiver, that is, spread spectrum communication theory. Thus, one of the most common spread spectrum communication technologies studied in this paper is the direct sequence spread spectrum communication system (DSSS),). Combined with the characteristics of this paper, the TMBOC modulation signal and the long period ranging code (P code) are emphatically described. Then, the basic model and acquisition algorithm of DSS signal acquisition are summarized, and several typical P-code acquisition algorithms are compared according to the characteristics of P-code long period. On the basis of the analysis and comparison, two methods based on FFT are selected to realize P-code direct-trapping module: phase parallel search of frequency domain pseudo-code and matched filter FFT. Then the FPGA is designed based on the simulation of the two selected capture algorithms. In this paper, the overall structure of the direct capture module, the structure of the unit sub-module, the simulation results and the hardware consumption are given in detail. Finally, the article is summarized, and further improvement is put forward.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN967.1
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 龐統(tǒng);張?zhí)祢U;趙德芳;金翔;;基于部分相關(guān)和全相位預(yù)處理的偽碼快速捕獲方法[J];計(jì)算機(jī)應(yīng)用研究;2011年06期
，本文編號(hào)：2262284
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