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registered in the one LSB. The beginning of the day according to the satellite time scale coincides with the
beginning of the recurrent superframe;
tb = the time interval within the current day according to UTC(SU) + 03 hours 00 min. The immediate data
transmitted within the frame are referred to the middle of tb. Duration of the time interval and therefore the
maximum value of tb depends on the value of the flag P1;
γn(tb) = the relative deviation of predicted carrier frequency value of n-satellite from the nominal value at the instant
tb, i.e.
n b Hn
n b
Hn
(t ) f (t ) f ,
f
−
γ =
t tb;
tellite time tn relative to GLONASS time tc at an instant tb,
xn(tb), yn(tb), zn(t
where
fn(tb) = the forecast frequency of n-satellite clocks at an instan
fHn = the nominal value of frequency of n-satellite clocks;
τn(tb) = the correction to the n-sa
i.e. τn(tb) = tc(tb) – tn(tb);
b) = the coordinates of n-satellite in PZ-90 coordinate system at an instant tb;
x􀀅n(tb), y􀀅n(tb), z􀀅n(tb) = the velocity vector components of n-satellite in PZ-90 coordinate system at an instant tb;
􀀅x􀀅n(tb), 􀀅y􀀅n(tb), 􀀅z􀀅n(tb) = the acceleration components of n-satellite in PZ-90 coordinate system at an instant tb,
which are caused by effect of sun and moon;
APP B-21 23/11/06
Annex 10 — Aeronautical Communications Volume I
En = al elapsed since
the instant of its calculation (uploading) until the instant t for n-satellite;
B = the health flag. Values greater than 3 indicate the fact of malfunction of given satellite;
P1 = al between the current and previous value of the tb
parameters in minutes as shown:
Time interval between adjacent values of tb in minutes
an indication of the “age” of the immediate information, i.e. a time interv
b
n
a flag indicating the time interv
P1
0 0
1 30
10 45
11 60
P2 =
lue of “0” indicates a
60-minute interval of service information transmit (t = 2, 6, 10 …);
P3 = ithin a
given frame. “1” corresponds to 5 satellites and “0” corresponds to 4 satellites; and
Δτn = in L2 sub-band and
navigation RF signal transmitted in L1 sub-band by given satellite:
Δτ = t – t
where t , t are the equipment delays in L1 and L2 sub-bands respectively, expressed in units of time.
he MSB shall be the sign bit. The chip “0” shall correspond
the “+” sign and the chip “1” shall correspond to the “–” sign.
time parameters. Arrangements of the ephemeris and time parameters
ithin a frame shall be as indicated in Table B-18.
3.2.1.3.4 Almanac parameters. The almanac parameters shall be as follows:
= an index showing relation of this parameter with the almanac;
MA
n = f the modification of nA-satellite: “00” indicates GLONASS satellite, and “01” indicates GLONASS-M
satellite;
= the GLONASS time scale correction to UTC(SU) time. The correction τ is given at the instant of day NA;
NA = . The correction τc and other
almanac data (almanac of orbits and almanac of phases) relate to this day number;
= the slot number occupied by n-satellite;
A = the channel number of a carrier frequency of nA-satellite (Table B-16);
A = the longitude of the first (within the NA-day) ascending node of nA-satellite orbit in PZ-90 coordinate system;
tλ
A
n = the time of the first ascend
a flag indicating whether the value of tb is odd or even. A value of “1” indicates a 30-
minute interval of service information transmit (tb = 1, 3, 5 …), a va
b
a flag indicating the number of satellites for which an almanac is transmitted w
the time difference between the navigation RF signal transmitted
n f2 f1
f1 f2
3.2.1.3.2 Ephemeris and time parameters. The ephemeris and time parameters shall be as indicated in Table B-17. For
the words for which numeric values may be positive or negative, t
to
3.2.1.3.3 Arrangement of the ephemeris and
w
A
an index o
τc c
the calendar day number within the 4-year period beginning since the leap year
nA
H n
λ n
ing node passage of nA-satellite within NA-day;
23/11/06 APP B-22
Appendix B Annex 10 — Aeronautical Communications
Table B-17. Ephemeris and time parameters
Parameter of bits
Sc r
(LSB)
Ef
ra
Number ale facto fective
nge Units
m ionless
15 5
　
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