Design Of Telemetry Data Acquisition And Transmission System Based On NiosⅡ

With the rapid development of telemetry acquisition technology, the effectivetransmission of mass-data have become the hot topic in current wireless telemetry researcharea. This paper has designed a telemetry image data acquisition and transmission systembased on the embedded processor NiosⅡ, which could receive the telemetry image data inreal time and retransmit it effectively.The paper research the transmission, receiving, storing and retransmission of the dataacquired from the telemetry image acquisition system, which is supported by an astronauticproject of the telemetry image gathering device. It proposes a plan that the design uses theembedded processor of NiosⅡas main controller, and it is based on the development ofSOPC technology of FPGA. We have studied the high-speed data transmission of LVDS andthe communication of digital interface for PCM, and achieved to receive telemetry imagedata in real time and retransmit it continuously. According to the actual requirements of datastorage, we have studied the large-capacity and high-speed storage characteristic of PSRAM.In the design, in order to achieve the purpose of high speed image data cache, we apply theparallel bit wide extended of data storage mode. As the main controller, NiosⅡis used toprocess telemetry image data in the system logic design. We have studied the structure ofNiosⅡprocessor according to the present development of SOPC and achieved to definecontrol interface of SRAM on the basis of analyzing the Avalon bus interface. The designhave applied modular concept that the receiving module used to receive data from LVDS,NiosⅡis used for the data processing and controlling of the whole system, and theretransmission module is used to retransmit PCM data. The paper have discussed the LVDS data transmission, PSRAM data cache andembedded system based on FPGA in detail, and achieved to receive, store and retransmit thetelemetry data. The procedure of system test has given in the paper, and the test results showthat the system is stable, reliable and practical in some way.