71 days simulations (GPS days 2025-01-01 to 2025-03-12)
=======================================================
Basis:
/data/CDR_test_data/common_error_free_base/
orb_pair2_sat1.txt
orb_pair2_sat2.txt
sca_pair2_sat1.txt
sca_pair2_sat2.txt

NGGM Metadata:
- Antenna Reference Point (ARP): (x=0, y=0, z=-0.5m) in nadir pointing SRF
- Zero Phase Center Offsets (ARP=L1=L2=L5), without phase center variations (PCV)

GNSS constellation (GPS/GALILEO): gnss/
(see gnss/README.txt)

Earth rotation:
- https://datacenter.iers.org/products/eop/rapid/standard/finals2000A.all
- (IERS conventions + high frequent Desai model (desai_model_jgrb51665-sup-0002-ds01.txt)

GNSS receiver simulation:
- Complete GPS days, 5s sampling
- Code/Phase observations
      GPS: L1C L1W L2W L2L C1C C1W C2L C2W
      GALILEO: L1C L5Q C1C C5Q
- without SNR information (not yet included in GROOPS).
- without clock noise
- without Code/Phase bias
- without ionosphere
- simulated integer ambiguities
- usual effects/corrections included (must be considered as in real data processing)
    -- phase windup
    -- relativistic clock and space time
- white elevation dependent observation noise (derived from Sentinel-2c real data)

filename convention: D11-PSD_v1.0_Clean.pdf
<MMM>_<CCCC>_<FFF><DDDDDDD>_<YYYYMMDDTHHMMSS>_<YYYYMMDDTHHMMSS>_<vvvv>.rnx.gz
with <MMM>     = NGN
     <CCCC>    = NEES
     <FFF>     = L1B
     <DDDDDDD> = _RINEXz (z = A/B)
     <YYYYMMDDTHHMMSS> = Start/End Time in UTC (corresponds to GPS 0:00 to 0:00 next day)
     <vvvv>    = 0000 (version)

Orbits in SP3c format:
- Both NNGM have SP3c identifier: L99
- Earth fixed frame
- ATTENTION: orbits are in the CenterOfNetwork/CenterOfEarth (CoN/CoE) regarding ocean tides (SP3 convention)
  To transform in an inertial CenterOfMass (CM) system the so called CoM correction for ocean tides must be applied
  (As the effect is small, the choosen ocean tide model (here: FES2022) is not important)

Kinematic orbits:       NGG_NEES_L2A_KPO/
Reduced-dynamic orbits: NGG_NEES_L2A_RPO/