基于偽碼測距的汽車防撞技術研究.pdf

1、三峽大學碩士學位論文基于偽碼測距的汽車防撞技術研究姓名：陳滟濤申請學位級別：碩士專業(yè)：控制理論與控制工程指導教師：萬鈞力20050501Abstract In the design of automatic anti-bumped system, the ranger measurement is very important. This paper is focused on the automatic ranger detectiv

2、e in anti-bumped system based on Pseudo-random code relativity theory. In first chapter, the paper analyses current automobile anti－bumped system, and compares with the characteristics of several ranger detective modes u

3、sed in anti-bumped system, then decides to use the quality anti-interference ability character of Pseudo-random code in radio frequency communicate, which takes advantage in solving the problem of ranger data measurement

4、 for traveling automatic. In second chapter, the paper introduces the base of Pseudo-random code ranger detective: m sequence Pseudo-random code generation and its charters, the compound modes used in ranger detective, P

5、seudo-random code modulate and radio frequency communication; random signal correlation analysis and detection. In third chapter, the paper is focused on the theory of Pseudo-random code ranger detective; analyses the sc

6、heme of Pseudo-random code ranger detective and constructs the correspondence mathematic model; researches the general algorithm applicable for Pseudo-random code ranger detective in anti-bumped system, proposes an impro

7、ved faster algorithm based on FPGA, which has faster calculation speed and better real time capability. In fourth chapter, this paper introduces the theory and method of Pseudo-random code correlative detection, research

8、ing Pseudo-random code phase modulation and compound ranger detective system, analyses the performance of this system. Using the radio frequency technical, it can mask the burst interference and carrier wave interference

9、, it also can control the measure precision under 0.09m even when the SNR reduced to +15dB. In fifth chapter, this paper discuss the question of carrier acquisition and tracking of high dynamic spread spectrum signals, t

10、he analysis’s presented for the influence of Doppler frequency shifts to the design of PLL(Phase Locked Loops),FLL(Frequency Locked Loops),and loop filters. Also, the question of fast carrier acquisition for high dynamic

11、 spread spectrum signals is analyzed. The new design method of digital complex soft loops is proposed, and the simulation results show that the question of fast carrier acquisition and tracking is solved by the digital c