Editing GLONASS (section)

==== Common properties of open CDMA signals====
{| class="wikitable"
|+ String types for navigational signals
|-
!Type!! Content of the information field
|-
|0 || (Reserved for system use)
|-
|1 || Short string for the negative leap second
|-
|2 || Long string for the positive leap second
|-
|10, 11, 12 || Real-time information (ephemerides and time-frequency offsets).<br/>Transmitted as a packet of three strings in sequence
|-
|16 || Satellite orientation parameters for the predictive thrust maneuver
|-
|20 || Almanac
|-
|25 || Earth rotation parameters, ionosphere models, and time scale model for the difference between UTC(SU) and [[International Atomic Time|TAI]]
|-
|31, 32 || Parameters of long-term movement model
|-
|50 || Cospas-Sarsat service message — L1OC signal only
|-
|60 || Text message
|}

{| class="wikitable"
|+ Information field of a string type 20 (almanac) for the orbit type 0.<ref group="nb">Navigational message field j (satellite ID) references the satellite for the transmitted almanac (j<sub>A</sub>)</ref>
|-
!colspan="2"| Field !! Size, bits !! Weight of the low bit || Description
|-
|Orbit type || ТО || 2 || 1 || 0 — circular orbit with 19100&nbsp;km altitude <ref group="nb">The set of almanac parameters depends on the orbit type. Satellites with geosynchronous, medium-Earth, and high-elliptical orbits could be employed in the future.</ref>
|-
|Satellite number || N<sub>S</sub> || 6 || 1 || Total number of satellites transmitting CDMA signals (1 to 63) which are referenced to in the almanac.
|-
|Almanac age || E<sub>A</sub> || 6 || 1 || Number of full days passed since the last almanac update.
|-
|Current day || N<sub>A</sub> || 11 || 1 ||  Day number (1 to 1461) within a four-year interval starting on 1 January of the last leap year <ref group="nb">In a departure from the Gregorian calendar, all years exactly divisible by 100 (i.e. 2100 and so on) are treated as leap years</ref> according to [[Moscow decree time]].
|-
|Signal status || PC<sub>A</sub> || 5 || 1 || [[Bit field]] encoding types of CDMA signals transmitted by the satellite.<br/>Three highest bits correspond to signals L1, L2 and L3:<br/>0 — transmitted,<br/>1 — not transmitted
|-
|Satellite type|| PC<sub>A</sub> || 3 || 1 || Satellite model and the set of transmitted CDMA signals:<br/>0 — Glonass-M (L3 signal),<br/>1 — Glonass-K1 (L3 signal),<br/>2 — Glonass-K1 (L2 and L3 signals),<br/>3 — Glonass-K2 (L1, L2, and L3 signals)
|-
|Time correction|| τ<sub>A</sub> || 14 || 2<sup>−20</sup> || Rough correction from onboard time scale to the GLONASS time scale ({{val|±7.8e-3}} с).
|-
|Ascension|| λ<sub>A</sub> || 21 || 2<sup>−20</sup> || Longitude of the satellite's first orbital node (±1 half-cycles).
|-
|Ascension time|| t<sub>λ<sub>A</sub></sub> || 21 || 2<sup>−5</sup> || Time of the day when the satellite is crossing its first orbital node (0 to 44100 s).
|-
|Inclination|| Δi<sub>A</sub> || 15 || 2<sup>−20</sup> || Adjustments to nominal inclination (64,8°) of the satellite orbit at the moment of ascension (±0.0156 half-cycles).
|-
|Eccentricity|| ε<sub>A</sub> || 15 || 2<sup>−20</sup> || Eccentricity of the satellite orbit at the ascension time (0 to 0.03).
|-
|Perigee|| ω<sub>A</sub> || 16 || 2<sup>−15</sup> || Argument to satellite's perigee at the ascension time (±1 half-cycles).
|-
|Period|| ΔT<sub>A</sub> || 19 || 2<sup>−9</sup> || Adjustments to the satellite's nominal draconic orbital period (40544 s) at the moment of ascension (±512 s).
|-
|Period change|| ΔṪ<sub>A</sub> || 7 || 2<sup>−14</sup> || Speed of change of the draconic orbital period at the moment of ascension ({{val|±3.9e-3}} s/orbit).
|-
|colspan="2" rowspan="2" | (Reserved) || L1OC: 23 || colspan="3" rowspan="2" | -
|-
|L3OC: 58
|}
{{reflist|group=nb}}