Research On The Data Bus Transmit Technology For The Rocket Control System

Signals in the current rocket control system are transmitted through the point-to-point cable network, which has brought some disadvantages. With the development of the rocket digital control and network transmission technology, the data bus transmit scheme has been paid more and more attentions. And it can efficiently simplify the system structure, reduce the initial mass and increase the reliability so that the performance of the whole weapon system can be improved.In this thesis, the problems in the signal transmission scheme of the current rocket control system are set out. Moreover, the distinguishing features and applications of the data bus techniques used in the moving platform are briefly introduced. The basic performances of four bottom data bus networks are studied by using the queues theory and time-slot analysis method. The improved approaches of priority for CSMA/CD protocol are discussed. In the viewpoint of information transmission, the control system of ballistic rocket is investigated. The signal source, flow direction and classification are analyzed in detail. The influences of sampling period and word length on data size are discussed respectively. Then, the five characteristics of signal transmission are summarized, which provide the scientific basis for bus scheme design. The notion and design principles of the bus transmission scheme are put forward. The characteristics and problems brought in the scheme are analyzed in depth, and the preliminary solutions are proposed. The time feature of the bus scheme is investigated, and its follow chart in one control cycle is given. Based on these studies, the topologies, protocols, and allocation plans of the scheme are discussed. The results show that the bus-type topology, command/response and priority CSMA/CD protocols may meet the requirements. The hardware design and bus selection are studied. Moreover, the advantages, limitations, and development tendency of the optical fiber scheme are summed up. With these researches, the foundation principles and design plan of the bus interface are discussed.Finally, the transmission schemes of one kind of typical rocket control system are designed with 1553B and CAN bus respectively. The influences on transmit delay caused by different net structures are also analyzed. The computational...