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Spirent KB Article
Doc ID: FAQ14683
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Positioning Application: Is it possible to log code or carrier phase data?
Environment/Versions
PosApp (SimGEN / SimREPLAYplus / SimREPLAY)
Answer
No - Code and Carrier Phase data cannot be logged directly with any of the data output features available in PosApp.
However you can derive the phase from
"Pseudorange" (PR) data for Code Phase; which is available from bulk logging, quick-look data and datastreaming
"Pseudorange Carrier" (PRC) data; which is available in quick-look data only
For Code Phase
Work out the length of a code chip
- e.g. GPS L1 C/A code rate = 1.023Mcps => (speed of light / code rate) = 299792458 / 1023000 =
293
m
Use PosApp to log the PR data
- SimGEN users have access to all three methods
- SimREPLAYplus and SimREPLAY users only have access to bulk log data
Divide the PR data by the code chip length, e.g. 25519845 / 293 =
87098.4471
The code phase is the fractional remainder, i.e. in this example,
0.4471
of a code chip
- Convert this to degrees (*360) or radians (*2pi) as preferred
For Carrier Phase
Work out the carrier wavelength
- e.g. GPS L1 freq. = 1575.42MHz => (speed of light / carrier freq) = 299792458 / 1575420000 =
0.19
m
Use PosApp to provide the PRC data
- Only SimGEN users have access to quick-look data
Divide the PRC data by the wavelength, e.g. 25519845 / 0.19 =
134314973.6842
The carrier phase is the fractional remainder, i.e. in this example,
0.6842
of a carrier cycle
- Convert this to degrees (*360) or radians (*2pi) as preferred
Version
2.0
Publish Date
2014-07-29
Categories
Product : SimREPLAYplus,SimREPLAY,SimGEN,PosApp
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