基于毫米波雷達(dá)定位的汽車三維防碰撞算法研究
[Abstract]:In recent years, with the introduction of the concept of Internet vehicles, driverless vehicles, intelligent vehicles are in full swing. As one of the key technologies of driverless vehicles and intelligent vehicles, anti-collision technology is also the key technology to avoid traffic accidents, and has become a hot research topic at home and abroad. Measurement technology is one of the key technologies in automobile anti-collision technology. The classical linear frequency modulation continuous wave (LFMCW) radar measurement method uses FFT transform to process the data. When the number of sampling points increases, the amount of calculation increases significantly, which makes the real-time performance of the measurement system unsatisfactory. In order to solve this problem, the cross-correlation function measurement method is introduced. The effective sampling point part of sampling information can be transformed by FFT with the value measured by cross-correlation function measurement method, and more accurate distance information can be measured quickly and efficiently. Vehicle safety distance model is the core technology of automobile anti-collision system. Most of the existing safety distance models take the actual information such as actual speed as reference factors, and do not consider the change of relative information such as relative speed reasonably, and do not take into account the influence of complex traffic environment such as road condition, weather condition and so on. Based on this, this paper refers to the construction principle of the existing safety distance model, based on the vehicle braking process, from the angle of relative velocity, according to the relative velocity 螖 v = 0, Three different safety distance models are established for three different cases: greater than 0 and less than 0. Not only the influence of relative speed on safety distance is considered reasonably, but also the influence of different pavement materials on safety distance model is considered, and the influence of weather factors and driver's driving habit reaction speed on safety distance is also considered. Finally, using the anti-collision system to detect and calculate the traffic information in real time, according to the anti-collision warning strategy, alarm is made through the grade of sound, light and liquid crystal display to remind the driver of the current safety state of the vehicle. When necessary, the auto brake system can be started to reduce the collision accident and ensure the convenience, safety and comfort of the vehicle travel. Based on the research of BP neural network, the problems such as many factors affecting vehicle safety distance, complex vehicle safety distance model and a large number of nonlinear changes are effectively solved. It can meet the requirements of updating the model parameters and even updating the model constantly in the actual traffic process, so that the vehicle anti-collision system can update the safety distance model and parameters according to the traffic conditions in real time.
【學(xué)位授予單位】:蘭州理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN958;U463.6
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