| NO. | M FILES | FUNCTION |
|---|---|---|
| 1 | CAcode.m | Generate different PRN's C/A code and calculate the correlation function between two C/A codes. |
| 2 | AllanVariance.m | Calculate the Alan variance and Modified Alan variance of the clock difference(phase) sequence or frequency sequence. |
| type | symbol | description |
|---|---|---|
| Standard Variance |  |
Calculated based on the relative frequency deviation relative to the square of its mean. |
| Allan Variance | .gif) |
Calculated based on the relative frequency deviation relative to the square of its mean. |
| Overlapping Allan Variance | |
Calculating the Allan variance based on full overlap sampling. |
| Total Variance | .gif) |
Calculate the Allan variance using the extended data. |
| Modified Allan Variance | .gif) |
Calculating the Allan variance based on the relative frequency deviation or the mean of the time difference data. |
| Modified Total Variance | .gif) |
Calculate "Modified the Allen Variance" with the extended data. |
| Time Variance | .gif) |
.gif) |
| Time Total Variance | .gif) |
.gif) |
| Hadamard Variance | .gif) |
Calculation based on the second difference of the relative frequency deviation or the cubic difference of the time difference data. |
| Overlapping Hadamard Variance | .gif) |
The Hadamard variance is calculated based on full overlap sampling. |
| Hadamard Total Variance | .gif) |
Calculate the Hadamard variance using the extended data. |
- CAcode.m
The purpose of the function is to generate a C/A code and calculate the correlation function between C/A codes.
function C_A = generateC_A(PRN,CodeLength,Delay)
% Generate C/A code
% Given:
% PRN i PRN number
% CodeLength i C/A code length
% Delay i C/A code delay
% Returned:
% C_A d C/A codefunction Rkl = Relafunc(Rk,Rl,CodeLength,NUM)
% Generate two C/A code correlation functions
% Given:
% Rk , Rl i First C/A code and Second C/A code
% CodeLength i C/A code length
% NUM i Number of chips
% Returned:
% Rkl d Correlation functions-
AllanVariance.m
The purpose of the function is to calculate the Alan variance and Modified Alan variance of the phase or frequency sequence.
function AllanVariance = AVAR_Phase(PhaseSequence,tau)
% Calculate the Alan variance of the clock difference (phase) sequence.
% Given:
% PhaseSequence Phase sequence
% tau Sampling interval
% Returned:
% AllanVariance Allan variancefunction AllanVariance = AVAR_Freq(FrequencySequence)
% Calculate the Alan variance of the frequency sequence.
% Given:
% FrequencySequence Frequency sequence
% Returned:
% AllanVariance Allan variancefunction Mod_AllanVariance = MAVAR_Phase(PhaseSequence,tau,m)
% Calculate the Modified Allan variance of the time difference (phase) sequence.
% Given:
% PhaseSequence Phase sequence
% tau Sampling interval
% m Smoothing factor
% Returned:
% Mod_AllanVariance Modified Allan variancefunction Mod_AllanVariance = MAVAR_Freq(FrequencySequence,m)
% Calculate the Modified Allan variance of the frequency sequence.
% Given:
% FrequencySequence Frequency sequence
% m Smoothing factor
% Returned:
% Mod_AllanVariance Modified Allan variance[1]Guo,H.R. . Study on the Analysis Theories and Algorithms of the Time and Frequency Characterization for Atomic Clocks of Navigation Satellites[D].Information Engineering University,2006.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent