The fire control computer is an important part of the entire fire control system, just like the human brain, and is also the intermediate link between the search and tracking system and the weapon aiming system in the fire control system. During the combat process, the fire control computer receives the target components collected by the search and tracking system in real time, and completes the real-time solution of the shooting elements according to the target's motion trajectory and the ballistic projection table of the configured artillery, and simultaneously controls the weapon aiming system to implement the target. Effective shooting. Therefore, the external interface relationship of the fire control computer is more complicated. This paper mainly describes the hardware design of the fire control computer interface circuit in a certain fire control system. 1 interface circuit design Because the number of interfaces in the fire control computer is relatively large, and the types are different, for the convenience of description, the interfaces in the system are divided into two categories: a communication interface and a control interface. 1.1 Communication interface The communication interface of the fire control computer mainly includes: (1) receiving the serial port azimuth and high and low angle serial port of the radar or the off-site radar; (2) receiving the parallel port of the radar distance, the laser distance, the radar state and the like. The interface circuits matched by different interfaces are also different. Since the serial port of the main CPU in the fire control computer is a standard RS232 port, the TIA/EIA-232-F level is output, and the tracking system uses a single chip microcomputer, and the output level is a TTL level, as shown in the serial port matching circuit of FIG. Using max232 for level shifting, the device contains 2 drivers, 2 receivers, and a voltage generator circuit to provide TIA/EIA-232-F levels. The device complies with the TIA/EIA-232-F standard and each receiver converts the TIA/EIA-232-F level to a TTL/CMOS level. Each transmitter converts the TTL/CMOS level to a TIA/EIA-232-F level. At the same time, in order to ensure the accuracy, reliability and anti-interference of the data transmission, the received signal RX in the serial port is converted into a differential form by the 96F175 and the transmitted signal TX through the 96F174, and then transmitted. In any combat mode, the main CPU must accept or send different data in real time, that is, there will be multiple sets of data hanging on the 16-bit data bus of the main CPU at the same time, which requires latching the temporarily unnecessary data. . As shown in Figure 2, the parallel port matching circuit, 74HCT373 is a three-state output of the eight D latch, the output terminals Q0 ~ Q7 can be directly connected to the bus. When the tri-state allows the control terminal OE to be low, Q0 to Q7 are in a normal logic state and can be used to drive a load or a bus. When OE is high, Q0~Q7 are in a high-impedance state, neither driving the bus nor the load of the bus, but the logic operation inside the latch is not affected. When the latch enable terminal LE is at a high level, Q varies with the data D. When LE is low, Q is latched at the established data level. Figure 2: Parallel port matching circuit In this circuit, the latch enable terminal LE is fixed to a high level, and the tristate allows the control of the control terminal OE to be determined by the main CPU. For the specific control process, see the control interface portion. 1.2 Control Interface The control interface mainly has display control of various state quantities for the operation of the warrior, and the specific display unit is controlled in the control panel or the command box panel, and the time-sharing multiplexing of the data interface. During the operation, the commander needs to know the various states of the system at any time in order to make a correct judgment. Therefore, the fire control computer should have various state quantities, such as tracking, searching, having elements, no elements, echoes, and tick. Points, faults and other information are displayed in real time to the operator and the company commander. Therefore, the control of the indication is particularly important, to be fast and accurate. Compiled by multiple GAL20V8, GAL decoding reads different address outputs W1 ~ W8 for data read and write control and indicator control. Take the control of the yuan lights as an example, see Figure 3, the lamp control circuit diagram, Figure 2 parallel port matching circuit, W1 is used for radar distance reading control, when the main CPU needs to read the radar distance, W1 will be set high, latch The data in the 74HCT373 is output to the data bus and read by the main CPU. Similarly, W2 is used for the control of the laser distance reading. When the main CPU needs to read the laser distance, W2 will be set high. W7 and reset control the extinction of the lamp through the AND gate 74HCT08 acting on the clear end of the flip-flop 74HCT74; W8 acts on the set end of the 74HCT 74 to control the illumination of the lamp. 2 Conclusion The design of the circuit has been applied in a certain type of fire control computer, and is officially equipped with the troops. After many years of verification, the design of the interface circuit is feasible, reliable, and has good reference.
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Design of fire control computer interface circuit
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