Design And Implementation Of Automobile Lane Change Auxiliary Radar Based On The Dual Channel Radio Frequency Front-end

With the rapid development of national economy, the automotive industry also has beendeveloping rapidly. Because the increasing of highway can not catch up with the growth of vehicles,traffic safety issues become more and more serious. Every year, a lot of traffic accidents on thehighway result in great loss of personal lives and national economy.This dissertation designs an automobile lane change auxiliary radar(LCA) on the highway. As thedriver wants to change lane, LCA will monitor the adjacent lane continuously. If the car on theadjacent lane is too close or it is driving in fast speed, LCA will alarm the driver to pay attention, inthat it is dangerous to change lane at this time. That is, LCA can achieve the purpose of auxiliarydriving to reduce the traffic accidents.Firstly, the basic function and all performance index and the feasibility of the radar are analyzed.Then, the hardware and the software algorithms of the radar are designed under the requirements ofall performance index and the basic function. The system contains24GHz radio frequency front-end,signal conditioning, data collection and digital signal processing. The radar uses triangle frequencymodulated continuous wave as transmit wave. When the echo is received, intermediate frequencysignal will be output after mixing filter. Then the signal will be sampled by A/D after filtered andamplified in the signal conditioning circuit. In the end, the digital signal will be put into DSP and beprocessed. Then the distance, velocity and angle of the target can be estimated and the position of thetarget can be correctly located. Finally, LCA will alarm the driver according to the dangerous levels.At last, the prototype test of LCA is made in laboratory conditions. The test results are analyzedon the basis of a large number of test data and software modification. The results show that theautomobile lane change auxiliary radar can measure the distance, velocity and angle of the targetaccurately and achieve all performance index request of the radar.