1.State Key Laboratory of Electronic Testing Technology，North University of China，Taiyuan 030051，China； 2.The Key Laboratory of Instrument Science and Dynamic Testing of the Ministry of Education， North University of China，Taiyuan 030051，China
Abstract： In view of the problems of multiple measurement parameters, time-consuming and high transmission quality requirements on the telemetry system, the collected data is converted from the time domain to the frequency domain, which greatly reduces the amount of data transmission, saves transmission time, and improves the data transmission efficiency of the aircraft. Based on the system circuit, the design of CAN_FD bus interface, DSP and FPGA communication interface and power supply interface are analyzed. The fast-changing parameter preprocessing device can process vibration, shock, and noise signals. The three are based on the same hardware platform and use different algorithms. When the amount of collected data reaches the requirement, the FPGA generates an interrupt and is processed by the DSP, and the result after the DSP processing is sent to FPGA, and then forward to the receiving device. In the experiment, the system verification was completed through a simulated test environment. Practice has proved that the error of the fast-changing parameter preprocessing device is less than 5%, and there is no frame loss, which has strong practical value.
Key words : preprocessing of rapidly changing parameters；frequency domain signal；CAN_FD interface；DSP；FPGA
