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Research on the Freeway Automotive Anti-collision Radar

Author: ZhangChengChang
Tutor: YangShiZhong
School: Chongqing University
Course: Communication and Information System
Keywords: Automotive collision avoidance radar Pulse radar FPGA Phase-coded pulse compression radar
CLC: TN959
Type: Master's thesis
Year: 2005
Downloads: 594
Quote: 6
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Abstract


With the rapidly growing popularity of the highway , the car crash occurred frequently , to prevent car collision has caused widespread concern of the world , therefore an urgent need to find an effective solution to the problem of automobile collision . In response to this situation , this paper introduces a highway vehicle collision avoidance radar system . The collision avoidance radar system for highway foggy weather to prevent the vehicle around the rear-end collision , regardless of the problem of the collision between the vehicle with its front of the vehicle obstacles , designed only to complete the most basic of distress detection and early warning the function of the front anti-collision radar . In this paper, the technology is mature , easy project to achieve centimeter wave pulse radar , single beam radiation ranging . Cm wave beam in order to make up for big role in distance than the millimeter-wave disadvantage of increase of a repeater system at the tail of the target vehicle , measure the distance from the vehicle in a dual response . In this paper, a large number of the block diagram , schematic , waveform diagram , and elaborate highway vehicle collision avoidance radar system structure , working principle of the workflow . And designed according to the different systems of the radar work based pulsed radar and two implementations based on the phase encoding compression radar , the two programs share the RF channel and display alarm terminal , which the RF channel part of the elaborate pulse radar program , the terminal 's display alarm described in part as a separate chapter . Intro for pulse radar program , its RF channel , intermediate frequency modulation and demodulation part , easily lead to miscarriage of justice due to the direct judgment on the received pulse , the paper designed the first high - speed sampling , the echo signal after synchronization cumulative pulse accumulation to improve the quality of the echo signal to improve the signal-to-noise ratio of the program , and FPGA and A / D , D / A pulse accumulation are introduced in detail . Highlight its working principle and method for phase- coded pulse compression radar program .

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