Abstract:

There are two problems in the measurement of the wideband frequency converting system using existing methods. One is inefficiency in measurement, the other is without effective group delay ambiguity resolution method. A new delay measurement method based on phase calibration (PCAL) signal is proposed and a group delay ambiguity resolution method based on extended Chinese remainder theorem (CRT) is given for solving the problems. The whole group delay characteristic of the tested bandwidth can be obtained by only one measurement according to the frequency characteristic of the PCAL signal. The robust condition of the extended CRT is derived. The ambiguity resolution strategy is detailed. Computer simulation results show that the delay measurement relative accuracy and the ambiguity resolution relative accuracy can reach the order of ps. The field experiment results show that the delay measurement relative accuracy reaches the order of 0.01 ns and the ambiguity resolution relative accuracy reaches the order of 0.1 ns.