G-Nut/Anubis - frequency bands
Anubis checks number of bands for a) individual epochs, b) satellites and c) type of observations (code/phase). All epochs with at least 4 satellites, observed from a single system, are considered as usable (see UseEp in Summary). Epochs with only single-frequency code or phase observations are counted as incomplete because dual-frequency measurements are considered as a minimum standard for precise applications (xCoEp/xPhEp in Summary). Similarly, satellite-specific code and phase observations are counted for as incomplete, and reported as xCoSv/xPhSv in Summary.
The section "Bands" than provides more details about frequency bands tracked for code and phase observations and all satellites in a user request sampling rate (int_stp="20"). Via setting sec_bnd="1" user requests a summary report of per cents of complete dual-/multi-band observations (see listing, the first part). For code and phase observations at pre-defined epochs and for all satellites the keyword is GNSCEP and GNSLEP, respectively. Count of single-band observations at the given epoch is given in the first data column labeled as SngFreq. If set sec_bnd="2", Anubis reports also epoch-wise band counting for all satellites and phase/code observations (see listing, the second part) using the user request sampling rate.
First figure shows a summary of all available bands for individual satellites (constellations in colors) for code (ligth) and phase (dark) observations.
Second figure shows time variation of the number of all available satellites for all constellations (in color)
including number of satellites providing a single-frequency only (gray = all epochs, black = user request epochs only).