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cpp
Like SPP, we only consider Pseudo Range (PR) observations, but we now consider those on two separate frequencies (L2 or L5). We still do not consider Phase Range (PH) observations, unlike PPP.
CPP is a little harder than SPP to comply with, because you will have to sample two carrier signals.
The combination allows accurate Ionosphere delay compensation. This means that the iono_delay
field
of the Modeling section of the config script is irrelevant in CPP (like in PPP). It also means that
the Ionosphere Delay exposed in the CGGTTS solution is now measued, not modeled.
- Requires secondary carrier signal: harder to comply with
- Will not generate a single solution if your observations come from a single signal
- Ionosphere is not modeled, this option becomes irrelevant and processing is actually faster (no modelling)
- Reach high end SPP results much more easily
Note that this framework supports any RINEX code, and so, allows working with any signal in theory.
- Similar Ionosphere bias cancellation
- No phase observation required: less signal observations required, easier to comply with
- Troposphere can only be modeled. Soon we will have the ability to inject it in a Kalman filter, but that is not the case as of today
- Hard to cross the metric barrier
Even though Ionosphere modeling is now turned off, we still obtain similar results to our best SPP examples:
cat conf.json
rinex-cli \
-f test_resources/CRNX/V3/ESBC00DNK_R_20201770000_01D_30S_MO.crx.gz \
-f test_resources/CLK/V3/GRG0MGXFIN_20201770000_01D_30S_CLK.CLK.gz \
-f test_resources/NAV/V3/ESBC00DNK_R_20201770000_01D_MN.rnx.gz \
-f test_resources/SP3/GRG0MGXFIN_20201770000_01D_15M_ORB.SP3.gz \
-P GPS \
-p -c rinex-cli/config/rtk/gpst_cpp_basic.json \
| tee logs.txt
When working with GPS, pay attention that L2 or L5 is now required and not many vehicles stream them.
You have to be careful that they do exist, which is true in our ESBC00DNK_R_20201
example.
Working with Galileo gives directly x10 better results
cat conf.json
rinex-cli \
-f test_resources/CRNX/V3/ESBC00DNK_R_20201770000_01D_30S_MO.crx.gz \
-f test_resources/CLK/V3/GRG0MGXFIN_20201770000_01D_30S_CLK.CLK.gz \
-f test_resources/NAV/V3/ESBC00DNK_R_20201770000_01D_MN.rnx.gz \
-f test_resources/SP3/GRG0MGXFIN_20201770000_01D_15M_ORB.SP3.gz \
-P GAL \
-p -c conf.json \
| tee logs.txt
- Move on to Precise Point Positioning (PPP)
- Add the CGGTTS option to convert the previous example to CGGTTS
- Wiki
- RINEX Data
- Getting Started
- Filter Designer (Preprocessor)
- QC/Analysis mode
- File operations
- Post Processed Positioning (ppp)