Method and device for improving phase measurement accuracy

A device for increasing an accuracy of a phase measurement, wherein the device comprises:

• a signal receiving module configured for receiving a measurement signal, wherein the measurement signal is generated according to a frequency-domain calibration sequence, the frequency-domain calibration sequence comprises N frequency-domain calibration signals, each of the N frequency-domain calibration signals corresponds to one specified frequency point, specified frequency points are within a specified frequency band, and N is an integer greater than 1,
• a frequency-domain transforming module configured for performing a frequency-domain transformation to the measurement signal to obtain a frequency-domain measurement sequence, wherein the frequency-domain measurement sequence comprises N frequency-domain measurement signals, and each of the N frequency-domain measurement signals corresponds to one specified frequency point;
• a phase determining module configured for determining phases corresponding to the N frequency-domain measurement signals, and determining a phase difference between the N frequency-domain measurement signals corresponding to two neighboring specified frequency points;
• a phase fitting module configured for, according to the phases, the phase difference and a window function, performing a sliding-window-type phase fitting to the frequency-domain measurement sequence, to obtain phase-fitting data corresponding to sliding windows;
• and
• a calibration-data determining module configured for, according to the phase-fitting data of the sliding windows, determining phase-calibration data corresponding to the sliding windows, and, by using the phase-calibration data of the sliding windows, forming the phase-calibration data within the specified frequency band.

A non-transitory computer readable medium storing a computer program, wherein the computer program comprises a computer-readable code, and when the computer-readable code is executed on a calculating and processing device, the computer-readable code causes the calculating and processing device to perform a method for increasing an accuracy of a phase measurement comprising:

• receiving a measurement signal, wherein the measurement signal is generated according to a frequency-domain calibration sequence, the frequency-domain calibration sequence comprises N frequency-domain calibration signals, each of the N frequency-domain calibration signals corresponds to one specified frequency point, specified frequency points are within a specified frequency band, and N is an integer greater than 1;
• performing a frequency-domain transformation to the measurement signal to obtain a frequency-domain measurement sequence, wherein the frequency-domain measurement sequence comprises N frequency-domain measurement signals, and each of the N frequency-domain measurement signals corresponds to one specified frequency point;
• determining phases corresponding to the N frequency-domain measurement signals, and determining a phase difference between the N frequency-domain measurement signals corresponding to two neighboring specified frequency points;
• according to the phases, the phase difference and a window function, performing a sliding-window-type phase fitting to the frequency-domain measurement sequence, to obtain phase-fitting data corresponding to sliding windows;
• and
• according to the phase-fitting data of the sliding windows, determining phase-calibration data corresponding to the sliding windows, and, by using the phase-calibration data of the sliding windows, forming the phase-calibration data within the specified frequency band.