Application Design of Armored Vehicle Power Carrier Bus System

The data communication technology of armored vehicle bus has been widely used. At present, these buses need to adopt special data harness, which will increase the manufacturing cost and maintenance difficulty of armored vehicles, and bring unstable factors to data transmission in armored vehicles. The data communication technology of armored vehicle power carrier bus realizes data transmission and sharing among ECU modules in armored vehicle without increasing the wiring harness in armored vehicle. In this paper, the key technologies of how to design and implement the bus are studied. At present, there are many current bus standards for armored vehicles, among which CAN bus and J1850 are widely used. These buses all adopt special data harness, and the ECU units of armored vehicles have different requirements for data transmission. It is necessary to arrange several different data networks in armored vehicles at the same time. In addition, the realization of these data buses requires special data communication wiring harness, which increases the wiring harness, manufacturing cost and maintenance difficulty in armored vehicles, and brings unstable factors to data transmission in armored vehicles. This paper introduces a new data transmission method of armored vehicle bus, the data communication technology of armored vehicle power carrier bus. This method can realize data transmission and sharing among ECU modules in armored vehicle without increasing the inner wiring harness of armored vehicle. 1. Analysis of System Bus Communication Channel Model Like low-voltage power line carrier system, the load of armored vehicle power line carrier system is complex and time-varying. Various types of electrical appliances are sometimes connected or disconnected, which makes the impedance characteristics of the conductor have great fluctuation. The transfer function of the system changes with the change of load at any time. It is a time-varying system. The time-varying communication channel model can be used to describe the armored vehicle power line carrier bus system. In the figure, except that noise interference is represented as additive random interference process, the other parts of the system are represented by corresponding frequency response functions. Transfer function and noise model in communication system can be obtained by measurement or theoretical analysis. This system model comprehensively summarizes the important characteristics that must be considered in the design of communication system. To further study the characteristics of armored vehicle power line carrier system, it is necessary to determine the parameters of transmission characteristics in the channel model. In this paper, the vector network analyzer 8712ES produced by Aglient Company in the United States is used. For an armored vehicle system, it is practically impossible to accurately describe the parameters of the vehicle network. The channel model is studied experimentally. The experimental method is to treat the system as a black box, without knowing the structure of the box accurately, as long as the transfer function describing the transmission characteristics of the black box signal can be obtained through experiments to express the system. 2019 9th International Conference on Information and Social Science (ICISS 2019) Copyright © (2019) Francis Academic Press, UK DOI: 10.25236/iciss.2019.018 97 For the armored vehicle power line carrier communication channel, its frequency response is a slowly changing stochastic process. The stochastic process can be seen as a white noise with a variance of Q2 passing through the output of a causal stable filter. If the system of the filter is selected correctly, the stochastic process can be expressed with limited parameters. Based on a large number of experimental measurements, the transmission characteristics of the power line carrier communication channel of armored vehicles are studied in the frequency band of 500 kHz to 10 MHz. The third-order autoregressive model of the channel's amplitude-frequency characteristics is established by using the random signal processing method. The following conclusions are drawn: 1) There is no problem of multi-aperture transmission in armored vehicle power line carrier communication channel, which is usually encountered in low-voltage power line carrier communication channel. 2) The power line carrier communication channel of armored vehicle is time-varying. In frequency domain, the time-varying only occurs in the frequency range below 5MHz, while in the frequency range above 5MHz, the time-varying is not obvious.