The Controller Design Of Fuze Safety And Termination Insurance

In order to achieve high efficient damage of the high-value munitions to the target, it is required that the detonation mode and parameters of the fuze can be set. Moreover, to further enhance the safety of the high-value munitions fuze, the fuze has to not only autonomously recognize the arming power signal from the missile, but also be able to receive the arming order from the missile-borne computer. What’s more, the fuze needs to identify the safety state of itself, and return the safety state and working status to the missile-borne computer through the communication interface in real time. So, the security control system of the fuze of high-value munitions is increasingly powerful and more complex. The controller is the core of the security control system, and directly, the reliability of the controller determines the safety of the fuze.In the current, the controller of most high-value munitions is MCU. Although its reliability has been verified, there are still many disadvantages which cannot meet the demand. Firstly, since the serial implementation of the microcontroller instructions, parallel processing can not be achieved absolutely in the MCU. Secondly, the MCU must make use of external hardware to achieve the complex interface logic. At last, when it needs to replace the microcontroller with increasing demands, it’s unlucky that the software is difficult to be shared between different microcontrollers. In response to these problems, with a kind of missile fuze as background, solutions based on FPGA device were put forward.In the study, application demands of the fuze safety control circuit were analyzed, and a FPGA device of Xilinx Spartan-3E family was used as the core controller. After in-depth study of the function module of the hardware, the principle of every module was presented and the PCB board was produced. Verilog HDL was used in digital logic design, and also, the netlist of design was loaded and prototype debugging was completed. At last, the prototype was connected to the special test device to verify its reliability.The main contents and innovations of the paper are as follows:(1) In addition to the modular designed analog circuit part, the digital logic part was also designed in a modular way by making full use of the modular design feature of hardware description language and the advantage of running in parallel of programmable logic devices, and each module run in parallel and work separately, which enhanced the reliability of the safety control system.(2) A non-standard serial communication interface was defined, and a serial synchronous setting method was put forward, which was applied to the case of clock skew when setting the detonation control circuit and effectively solved the problem of unreliable setting resulted from clock skew. The design was able to set two detonation control circuits at the same time, which greatly improved the setting efficiency.(3) While serially setting the denotion control circuit, the security control system was communicating with the missile-borne computer through a standard serial communication interface (RS-422 interface), which improved information crosslinking between the missile and the fuze.(4) The communication protocol involved in the safety control circuit, and other delay time and variable-bit-width which need upgrades and expansion, etc, were defined in parameter from in the FPGA device, and scalable interfaces were set aside. So, the design can be easily used to satisfy another missile fuze by setting the corresponding value of the parameter according to different demands, which greatly increased the portability and the universal of the safety control system.