Study Of The Alarming Technique For Automobile's Rear-end Anti-collision By Radio

With the rapid development of the car industry and the number of the automobiles increasing day by day in the world, study of the technique for automobile anti-collision has become the key to upgrading vehicle's intelligence. Therefore, it takes an important role in ensuring people's life and property and in improving the economic benefit to carrying trade. In this paper, for the purpose of the automobile's rear-end anti-collision especially on freeway with heavy frog, we propose the plan of the alarming system for rear-end anti-collision based on the detection technology with ultrasonic. This system's feasibility is explained in detail from both the view of hardware and software. Firstly, the theory and the architecture of hardware system are described, Secondly, the steps of the signal processing are discussed in detail. Based on the experiments and the characteristics of the signal, we pre-process the signals with band-pass filter , proportional amplifier and coherent demodulator. After sampling and analysis Doppler information, we display the final results distinctly to alarm in time.In summary, this thesis made a research on alarming system, which includes :1. An new scheme for automobile's rear-end anti-collision is proposed by ultrasonic approach;2. Based on the coherent modulation model, Doppler information is obtained by using AD633 analog multiplier and active low pass filter;3. Signal's analog to digital sampling and FFT based on TMS320LF2407 DSP are studied;4. Signal sampling control and butterfly operation algorithm with FPGA are simulated with success...