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Automobile anticollision radar system based on frequency-modulated continuous wave

A technology of frequency modulation continuous wave and anti-collision radar, which is applied in the radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem of rigid and single countermeasures, small action distance, and accuracy of speed and distance measurement Not advanced question

Inactive Publication Date: 2012-11-21
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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AI Technical Summary

Problems solved by technology

FMCW radar has been proposed for many years, but due to the influence of leaked modulation waves, this kind of radar has a relatively small range, the accuracy of speed and distance measurement is not high, and the countermeasures are relatively rigid and single

Method used

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  • Automobile anticollision radar system based on frequency-modulated continuous wave
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  • Automobile anticollision radar system based on frequency-modulated continuous wave

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Embodiment Construction

[0015] The FMCW radar distance measurement and speed measurement system of the present invention is realized by the following steps: the function generator in the radar sensor module generates a modulation signal, that is, a frequency-adjustable triangular wave or a sawtooth wave, and the modulation signal is sent to a voltage-controlled oscillator for frequency modulation to obtain a frequency A mmWave signal that varies according to the modulation waveform. Among them, the linearity of the voltage-controlled oscillator is required to be as high as possible to reduce leakage and improve measurement accuracy. The center frequency of the VCO can be 24G, 40G, 76G-79G and other frequency bands, which can be configured according to different distances and models. For example, 24GHz is used for low-speed detection and control, about 40GHz is used for identification of large vehicles, and 76-79GHz is used for identification of small vehicles. Part of the energy of the millimeter wa...

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Abstract

The invention relates to an automobile anticollision radar system based on frequency-modulated continuous wave (FMCW) and belongs to the technical field of automobile protection. The system can measure the distance and velocity of a target and effectively avoid car crashes. The system comprises the following components: a radar sensor, a filter, an automatic gain control amplifier, an analog-to-digital converter, a digital signal processor and a corresponding early-warning device. The radar sensor collects signals including leaked modulation, intermediate-frequency and high-frequency signals; the filter filters off the leaked modulation waves and high-frequency component; in the digital signal processor, the spectral analysis is performed by means of FFT and the frequency measurement results are converted into distance information and velocity information; and different warning modes are adopted according to the measurement results. The maximum acceptance range of the system can reach 150 m, the distance discrimination is 1 m, the velocity discrimination is 1 m / s, and the working environment is -40 DEG C to -80 DEG C.

Description

【Technical field】 [0001] The invention belongs to the technical field of FMCW automobile anti-collision radar distance measurement and speed measurement, and proposes a FMCW radar distance measurement and speed measurement system, which can accurately measure the distance and speed of a target in a relatively long range, and take corresponding measures sensitively 【Background technique】 [0002] The research on automotive radar began in the 1960s, and the early development was relatively slow due to the limitation of components. With the advancement of integrated circuits, the cost of manufacturing radars has dropped. At the same time, in line with the development of the automobile industry, automotive radar technology is rapidly emerging. According to the analysis of road traffic automobile accidents, it is shown that more than 80% of traffic accidents are caused by the driver's untimely response or misjudgment. The calculation shows that: the driver's reaction is slow fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/93
Inventor 唐玲王正鑫黄利君徐峰孟繁宇李燕红王新安张兴
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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