TDC (time digital converter) time interval measurement temperature compensation method

Abstract

The invention discloses a TDC (time digital converter) time interval measurement temperature compensation method. The TDC time interval measurement temperature compensation method includes dividing a power divider f<1> into two channels before measured input signals f<1> and f<2> are measured, respectively connecting three channels of input signals into channels Start, Stop 1 and Stop 2 of a TDC measurement unit and enabling a time synchronization unit to generate local time stamps by the aid of a reference clock f<c>; enabling the time synchronization unit to record a corresponding moment for each output observational measurement record after TDC time difference measurement and temperature measurement start to be carried out, aligning output time difference Y<t> and output temperatures X<t> in real time, then inputting the output time difference Y<t> and the output temperatures X<t> into an error transfer function module and inputting values T<1-2> into a real-time temperature compensation module; enabling the error transfer function module to fit error transfer functions for the temperatures and time difference of a channel 1 by the aid of observational measurement time difference Y<t> and temperature X<t> of front N points; compensating currently measured values T<1-2>(t) and outputting time interval values TDelta between the signals f<1> and f<2>. The observational measurement time difference Y<t> and temperatures X(t) of the front N points are used as sampling windows. The TDC time interval measurement temperature compensation method has the advantages that the problem of influence of temperatures on time interval measurement can be solved, and the TDC time interval measurement precision can be improved.

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...

Images