| Inertial platform, also known as the gyro stabilized platform, can provide ameasurement reference for the navigation system. In order to make the inertialplatform work stably, additional stabilization loop will be added to the controlsystem. This closed loop control system is an essential link to realize accurateinertial navigation. In fact, the inertial platform of the navigation system will workunder atrocious conditions for a long time. The atrocious environment, includinghigh strength, strong shock acceleration and electromagnetic interference, will makethe microprocessor crash easily, which lead to grave consequences.Aiming at these problems, this paper presents a dual redundancy system, byintroducing the hardware redundancy fault-tolerant technology to the existingcontrol system. The purpose of this subject is to ensure that when the host in thecontrol system is breakdown, it can switch to the slave quickly and smoothly.First, the reliability of different hardware redundancy system is analyzed. Inconsideration of the function and performance of the existing control system, adetailed scheme of dual redundant loop control system is put forward, which iscompatibility with the existing one.Secondly, the detail hardware circuit will be designed. The hardware circuitwill take two TMS320F2812and one FPGA as the core, including the RS485/422external communication interface and digital logic arbitration unit.Again, analysis and determine the communication scheme which is based onthe MCBSP serial bus. The slave will acquire the real-time operation data of the hostby the MCBSP serial bus.Finally, the stabilization loop dual redundancy switching algorithm will beintegrated with the existing control algorithm. Then the dual redundancy system willbe connected to the inertial platform for testing and validation. This paper willpresent the final test results, in two aspects including function and performance, toprove the correctness and reliability of the scheme. |
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