Design Of Environmental Data Acquisition System In Missile Cabin

In view of the special use environment of missile-borne photoelectric system,the impact,vibration,zero frequency and temperature of missile-borne photoelectric system should be fully considered in the design.Therefore,it is necessary to collect relevant parameters to provide data support for the subsequent design of missile-borne photoelectric system.Firstly,the research status at home and abroad is analyzed,and the frontier technology of missile-borne data acquisition system is obtained.Combined with the design indexes,the overall design scheme of the environmental data acquisition system in the missile-borne cabin was proposed.The accelerated acquisition method based on FPGA is analyzed,and the digital filtering algorithm with improved accuracy is implemented on FPGA.The acquisition rate and sampling accuracy of the environmental data acquisition system in the missile cabin are improved.Secondly,the hardware part of the missile-borne cabin environment data acquisition based on FPGA is designed,and the multi-source and multi-channel data acquisition is realized.The hardware part mainly includes modules such as power management,acquisition control,storage,communication and PCB plate making.Power management adopts high integration and high efficiency voltage conversion chip,which can realize the excitation of sensors and provide corresponding levels for each control chip.The acquisition control module adopts the joint design method of analog and digital circuit,proposes the design method of multi-channel parallel signal conditioning circuit,and designs the peripheral circuit of high precision ADC data acquisition.The storage module adopts e MMC control protocol to solve the problems of large capacity data storage and error check.Communication module uses USB data transmission mode to read memory card data at high speed;p CB plate making module adopts the design method of modularization and analog digital separation,and fully considers the miniaturization and shock resistance of missile borne system.Then,according to the system functional requirements and signal characteristics,the FPGA multi-channel data parallel acquisition logic control is realized by Verilog-HDL language.The control timing of ADC is improved and a new timing control method is adopted to accelerate the sampling rate.Using FIR digital filtering algorithm theory,the collected data are filtered through FPGA hardware,and the acquisition accuracy is improved.The e MMC5.1protocol is used to complete the large-capacity storage of data,and the data verification algorithm is realized.USB2.0 communication protocol is used to complete the reading of stored data by the ground computer.Finally,the correctness of the design is verified by simulation.Finally,according to the environment used by the environmental data acquisition system in the missile-borne cabin,an experimental platform is built.The results verify that the system meets the expected technical index requirements,and the system has good environmental adaptability,which can be used for data acquisition in various occasions.