gnss-sdr/src/utils/rinex-tools/README.md

obsdiff

This program computes Single-difference and Double-difference from RINEX observation files.

Building

This program is built along with GNSS-SDR if the options ENABLE_UNIT_TESTING_EXTRA or ENABLE_SYSTEM_TESTING_EXTRA are set to ON when calling CMake:

$ cmake -DENABLE_SYSTEM_TESTING_EXTRA=ON ..
$ make obsdiff
$ sudo make install

The last step is optional. Without it, you still will get the executable at ../install/obsdiff.

Usage

$ obsdiff --ref_rinex_obs=reference.20o --test_rinex_obs=rover.20o

There is some flexibility in how flags may be specified. The following examples are equivalent:

$ obsdiff -ref_rinex_obs=reference.20o
$ obsdiff --ref_rinex_obs=reference.20o
$ obsdiff -ref_rinex_obs reference.20o
$ obsdiff --ref_rinex_obs reference.20o

Available command-line flags:

Command-line flag	Default value	Description
‑skip_obs_transitory_s	30.0	Skip the initial observable outputs to avoid transitory results [s].
-skip_obs_ends_s	5.0	Skip the lasts observable outputs to avoid transitory results [s].
-single_diffs	false	[true, false]: If true, the program also computes the single difference errors for Carrier Phase and Doppler measurements (requires LO synchronization between receivers).
-compare_with_5X	false	[true, false]: If true, the program compares the E5a Doppler and Carrier Phases with the E5 full Bw in RINEX (expect discrepancy due to the center frequencies difference).
-dupli_sat	false	[true, false]: If true, this flag enables special observable test mode where the scenario contains duplicated satellite orbits.
-dupli_sat_prns	1,2,3,4	List of duplicated satellites PRN pairs (i.e., 1,2,3,4 indicates that the PRNs 1,2 share the same orbit. The same applies for PRNs 3,4).
-ref_rinex_obs	reference.obs	Filename of reference RINEX observation file.
-test_rinex_obs	test.obs	Filename of tested RINEX observation file.
-show_plots	true	[true, false]: If true, and if gnuplot is found on the system, displays results plots on screen. Please set it to false for non-interactive testing.