GNSS data abbreviations
Some of the most fundamental GNSS measurements retrieved from GNSS receivers include:
- CNR: carrier to noise ratio or C/N0. The estimation technique varies between receivers. Typical values in the range 30..50 [dB Hz]
- PSR: Psuedorange [meters]
- ADR: accumulated Doppler range–carrier phase measurements [cycles]
Using networks of GNSS receivers along with appropriate post-processing techniques, estimated maps of vertical TEC (integrated electron density) can be derived:
![Haystack TEC map](https://www.haystack.mit.edu/images/tec_20170726.png)