A temperature compensation method for tdc time interval measurement

Abstract

The invention discloses a temperature compensation method for TDC time interval measurement, wherein the input signals to be tested are respectively f1 and f2, and the power divider of f1 is divided into two paths before measurement, and then the three input signals are respectively connected to the TDC The Start, Stop1, and Stop2 channels of the measurement unit, and the time synchronization unit uses the reference clock fc to generate local time stamps; when the TDC time difference measurement and temperature measurement are turned on, the time synchronization unit records the corresponding time for each output observation, and the output The time difference Yt and the temperature Xt are aligned in real time and input to the error transfer function module, and T1-2 is input to the real-time temperature compensation module; then, the error transfer function module uses the first N point observations to measure the time difference Yt and the temperature Xt as the sampling window to simulate Combined with the error transfer function of the temperature and the time difference of channel 1; finally, the currently measured T1-2(t) is compensated, and the time interval value △T from f1 to f2 is output. The method of the invention has the advantages of solving the problem that the time interval measurement is affected by temperature and improving the accuracy of the TDC time interval measurement.

Description

technical field [0001] The present invention relates to the technical field of satellite navigation, in particular to the development technology of time-frequency signal high-precision time interval measurement equipment for satellite navigation ground station time-frequency system networking, and especially proposes a TDC time interval measurement in the technical category of atomic clock and time-frequency system temperature compensation method. Background technique [0002] In the GNSS system, the high-precision time interval measurement technology is of great significance in the integrity monitoring of the time-frequency reference. In recent years, precision time interval measurement technology based on time-to-digital conversion (Time Digital Converter, TDC) chip gate circuit delay is a research hotspot. The United States, Japan, Europe and other countries have done a lot of research on this. They use integrated circuits With the advantages in the field, a large number...

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