Design Of Self-Calibration High-Precision Positive And Negative Time Interval Measurement System Based On FPGA

Precision measurement technology is the basis for the development of science and technology. Precision time measurement technology, not only in radar, sonar measurements, experimental astronomy, high energy physics experiments, geodynamics, and other fields have important applications, but in the military, aerospace, defense has also played a significant role. In addition, high-precision measurement interval in aspect of the large space dimension measurements and positioning also has a very important application, the study precision time interval measurement method has very important significance. Therefore, research of precision time interval measurement method has very important significance.Based on the domestic and foreign common time interval measurement methods, this paper discusses the various principle of measuring methods. Finally, this paper takes a temporal interpolation method as the final measurement. According to the design index of system, this paper designs the overall design scheme. This paper simulates and analyzes error for temporal interpolation method using Modelsim. Finally, this paper determines the feasibility and validity of the method.In this paper, hardware design selects EP4CE15E22C8N chip as the main control chip. According to the demand of system, this paper builds hardware circuit, designs schematic of the control board and draws the PCB. Finally, this paper completes hardware welding and debugging. On the software side, this paper programs PLL module, signal generator module, the time interval measuring module and so on. Finally, this paper debugs hardware and software. The experimental results show that high-precision time interval measurement system based FPGA has advantages of certain temperature compensation, dual-channel simultaneous measurement and so on. Final measurement resolution of this system is 400ps. The measuring range of the system is Ins to 17s.