Phase calibration method and device

1. A phase calibration method, comprising:

receiving a measurement sequence through a transmission channel;

when a signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, performing a time domain windowing for a noise suppression on the measurement sequence;

segmenting the received measurement sequence according to a preset rule to obtaining segmented measurement sequences;

respectively determining a phase calibration factor of each of the segmented measurement sequences, wherein the each. of the segmented measurement sequences respectively corresponds to a segmented phase of segmented phases; and

when performing a phase calibration on a sequence to be verified, according to a matching relation between a phase of the sequence to be verified and each of the segmented phases, using the phase calibration factor corresponding to a matched segmented phase to perform the phase calibration on the sequence to be verified.

2. The phase calibration method according to claim 1 , wherein the step of segmenting the received measurement sequence according to the preset rule comprises:

segmenting the received measurement sequence by a greedy segmenting algorithm in a frequency domain.

3. The phase calibration method according to claim 2 , wherein the received measurement sequence is a measurement sequence generated at a preset frequency interval Δf, and the measurement sequence comprises N frequency intervals, wherein N is a natural number greater than 2; and each of the N frequency intervals corresponds to a sampling point of sampling points in the received measurement sequence; and

the step of segmenting the received measurement sequence by the greedy segmenting algorithm in the frequency domain comprises:

determining a first segmenting length N1 of a first segmented measurement sequence in the received measurement sequence, wherein an initial value of the first segmenting length N1 is a maximum segment interval N max of the measurement sequence, and the maximum segment interval N max comprises at most N/2 frequency intervals;

determining a phase slope k of the first segmented measurement sequence;

determining a first phase fitting curve φ′(i)=k*f idx +b of the first segmented measurement sequence through the phase slope k and an initial phase value h of the first segmented measurement sequence, wherein f idx is a frequency interval index;

determining a difference value between a first fitting phase of each of the sampling points determined according to the first phase fitting curve and an actual phase of the each of the sampling points of the first segmented measurement sequence;

if the difference value is greater than a preset difference value threshold, reducing a number of the N frequency intervals contained in the first segmenting length N1;

repeating above steps until the first segmenting length N1 and the first phase fitting curve with the difference value no more than the present difference value threshold are determined;

using the first segmenting length N1 as an initial value of a second segmenting length N2 of a second segmented measurement sequence in the measurement sequence, and determining the second segmenting length N2 of the second segmented measurement sequence and a second phase fitting curve with the difference value no more than the preset difference value threshold; and

repeating the above steps until the received measurement sequence is completely segmented.

4. The phase calibration method according to claim 1 , wherein the step of segmenting the received measurement sequence according to the preset rule comprises:

when the received measurement sequence is a symmetric full-bandwidth measurement sequence, taking a center frequency as a boundary to divide the symmetric full-bandwidth measurement sequence into a first frequency-band measurement sequence and a second frequency-band measurement sequence, wherein phase slopes of the first frequency-band measurement sequence and the second frequency-band measurement sequence are symmetric at the center frequency,

performing a first segmenting on the first frequency-band measurement sequence by a greedy segmenting algorithm in a frequency domain; and

according to a symmetric relation between the phase slopes of the first frequency-band measurement sequence and the second frequency-band measurement sequence, employing a second segmenting corresponding to the first segmenting in the second frequency-band measurement sequence.

5. The phase calibration method according to claim 3 , wherein the step of respectively determining the phase calibration factor of the each of the segmented measurement sequences comprises:

performing a linear fitting on the each of the segmented measurement sequences according to a preset resolution Δf res to obtain a second fitting phase of second fitting phases of the each of the segmented measurement sequences in a unit of the preset resolution, wherein the preset resolution Δf res is smaller than the preset frequency interval Δf; and

respectively determining the phase calibration factor corresponding to each of the second fitting phases.

6. A phase calibration device, comprising:

a memory having instructions stored on the memory;

a processor configured to execute instructions to perform the following operations, comprising:

receiving a measurement sequence through a transmission channel;

when a signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, performing a time domain windowing for a noise suppression on the received measurement sequence:

segmenting the received measurement sequence according to a preset rule to obtaining segmented measurement sequences;

respectively determining a phase calibration factor of each of the segmented measurement sequences, wherein the each of the segmented measurement sequences respectively corresponds to a segmented phase of segmented phases; and

when performing a phase calibration on a sequence to be verified, according to a matching relation between a phase of the sequence to be verified and each of the segmented phases, using the phase calibration factor corresponding to a matched segmented phase to perform the phase calibration on the sequence to be verified.

7. The phase calibration device according to claim 6 , wherein the step of segmenting the received measurement sequence according to the preset rule comprises:

segmenting the received measurement sequence by a greedy segmenting algorithm in a frequency domain.

8. The phase calibration device according to claim 7 , wherein the received measurement sequence is a measurement sequence generated at a preset frequency interval Δf, and the measurement sequence comprises N frequency intervals, wherein N is a natural number greater than 2; and each of the N frequency intervals corresponds to a sampling point of sampling points in the received measurement sequence; and the step of segmenting the received measurement sequence by the greedy segmenting algorithm in the frequency domain comprises:

determining a first segmenting length N1 of a first segmented measurement sequence in the received measurement sequence, wherein an initial value of the first segmenting length N1 is a maximum segment interval N max of the measurement sequence, and the maximum segment interval N max comprises at most N/2 frequency intervals;

determining a phase slope k of the first segmented measurement sequence;

determining a first phase fitting curve φ′(i)=k*f idx +b of the first segmented measurement sequence through the phase slope k and an initial phase value b of the first segmented measurement sequence, wherein f idx is a frequency interval index;

determining a difference value between a first fitting phase of each of the sampling points determined according to the first phase fitting curve and an actual phase of the each of the sampling points of the first segmented measurement sequence;

if the difference value is greater than a preset difference value threshold, reducing a number of the N frequency intervals contained in the first segmenting length N1;

repeating steps above until the first segmenting length N1 and the first phase fitting curve with the difference value no more than a present different threshold are determined;

using the first segmenting length N1 as an initial value of a second segmenting length N2 of a second segmented measurement sequence in the measurement sequence, and determining the second segmenting length N2 of the second segmented measurement sequence and a second phase fitting curve with the difference value no more than the preset difference threshold; and

repeating the steps above until the received measurement sequence is completely segmented.

9. The phase calibration device according to claim 6 , wherein the step of segmenting the received measurement sequence according to the preset rule comprises:

when the received measurement sequence is a symmetric full-bandwidth measurement sequence, taking a center frequency as a boundary to divide the symmetric full-bandwidth measurement sequence into a first frequency-band measurement sequence and a second frequency-band measurement sequence, wherein phase slopes of the first frequency-band measurement sequence and the second frequency-band measurement sequence are symmetric at the center frequency;

performing a first segmenting on the first frequency-band measurement sequence by a greedy segmenting algorithm in a frequency domain; and

according to a symmetric relation between the phase slopes of the first frequency-band measurement sequence and the second frequency-band measurement sequence, employing a second segmenting corresponding to the first segmenting in the second frequency-band measurement sequence.

10. The phase calibration device according to claim 6 , wherein the step of respectively determining the phase calibration factor of the each of the segmented measurement sequences comprises:

performing a linear fitting on the each of the segmented measurement sequences according to a preset resolution Δf res to obtain a second fitting phase of the each of the segmented measurement sequences in a unit of the preset resolution Δf res , wherein the preset resolution Δf res is smaller than a preset frequency interval Δf; and

respectively determining a phase calibration factor of each of second fitting phases.

11. A non-transitory computer-readable medium storing a computer program including instructions that when executed by a processor of a phase calibration device, cause the phase calibration device to perform the phase calibration method according to claim 1 .