Design And Fabrication Of Missile-borne Image Recorder And Unit Test Device

For a certain type of missile developed measurement system requirements, a set ofequipment is designed， including missile-borne image recorder and its unit test device, inorder to achieve the function of two-channel digital image acquisition, storage and post-back,etc., and complete the closed-loop test of the entire system. After analysis of the datarecorder home and abroad, with the basis of system design principles, the overall designscheme is expounded.The mainline in the article is the design of image recorder, which is started from twoaspects of hardware and software design. Image recorder mainly consists of power supplymodule, storage units and a master card, with NAND FLASH as memory chips, FPGA as thecore controller, and LVDS as data acquisition, post-back and reading interface. By consultingthe manual datasheets of the main electronic devices and analysis from physical level, designand verification of functional circuit modules are made in accordance with technicalindicators. Using top-down design ideas, FPGA logic timing is designed, with imageacquisition, caching, records, post-back and remote reading as the main functional blocks.The article focuses on the NAND FLASH access processes, chooses a reasonable operatingmode of the storage module, and identifies the sequential access to storage space based on thestructural characteristics of the image frame.Unit test device is ancillary equipment for image recorder used as an equivalent systemto simulate instructions and image source and receive the post-back data. It’s anotherimportant role is completion of the closed-loop test in line with the recorder. Many hardwarecircuits and logic timing circuits of unit test device are highly similar to those of imagerecorder, so just unique hardware and software design is introduced, including a USB communication interface hardware circuit design, firmware design, communication protocols,and mechanism of image sources, etc.End of the article gives the specific methods and steps of the system hardware andsoftware debugging. Since the application environment for image recorder is missile-bornemeasurement system, reliability design and test verification methods are proposed. Testingand data analysis results show that the system meets the mission requirements, stable andreliable.