Research On The Direction Of A Vehicle Key Receiver

With the rapid development of intelligent vehicle technology,in order to meet the safety,comfort and entertainment of drivers and passengers,the vehicle is equipped with a variety of intelligent auxiliary systems,such as adaptive cruise system,automatic parking system,tire pressure monitoring system,etc.,which leads to the gradual increase of electronic and electrical equipment on the vehicle,thus causing researchers to pay attention to the electromagnetic compatibility of the vehicle.The vehicle key receiver belongs to the vehicle antenna.Its stability directly affects the user's experience.For the product,it belongs to the product defect.Therefore,the research on the direction of vehicle key receiver has important practical significance.Because the user is in the horizontal plane when opening or locking the door,this topic mainly discusses the horizontal directionality of the key receiver.This paper mainly discusses the influence of vehicle body on the horizontal directionality of key receiver by testing the horizontal directionality of single key receiver and the horizontal directionality of key receiver under the condition of vehicle.Based on the experiment,simulation is carried out in FEKO to verify the feasibility of the simulation method,which can shorten the cost of enterprise research and development,and provide reference for the research of vehicle antenna simulation.The main contents of this project are as follows:1?In this paper,the electromagnetic calculation method mom and mlfmm are introduced.At the same time,the radiation principle of the basic oscillator and the important parameters of the antenna are introduced.2?In the multi probe laboratory and semi anechoic room,the horizontal directionality of the single key receiver and the key receiver under the condition of the whole vehicle is tested.The influence of the vehicle body on the horizontal directionality of the key receiver is discussed preliminarily,which lays the foundation for the simulation.3?Carry out the key receiver horizontal directionality simulation.First of all,the key receiver model is established,and the horizontal directivity simulation is carried out in FEKO.The simulation results are compared with the horizontal pattern of the single key receiver to verify the accuracy of the key receiver model.Secondly,the whole vehicle model is built according to the experimental vehicle,the key receiver model is placed on the whole vehicle model according to the original vehicle position,and the horizontal directionality simulation of the key receiver under the condition of the whole vehicle is carried out.The simulation results are compared with the experimental results to verify the accuracy of the whole vehicle model,and the feasibility of the simulation method of the horizontal directionality of the key receiver in FEKO is verified ?4?Analyze the factors that affect the antenna directivity,mainly consider the influence of the car body and other electrical equipment,and optimize the horizontaldirectivity by adjusting the installation position of the key receiver.First of all,by considering the actual size of the car body,the pre-installation position is determined,and the horizontal directionality of each position key receiver is simulated.Through the degree of pattern distortion,the degree of pattern distortion of each position is evaluated,and three possible installation positions are obtained.Secondly,considering the coupling of GPS positioning antenna and key receiver,the coupling degree of each position is obtained through simulation,and the final installation position of key receiver is determined through analysis and comparison.Finally,the key receiver is installed in a certain position,and the horizontal pattern is measured.The results of measurement and simulation are compared to verify the effectiveness of the optimization.