GLOEPHEMERIS

Decoded GLONASS L1 C/A ephemeris

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

This log contains GLONASS L1 C/A ephemeris information. GLONASS ephemerides are referenced to the PZ90.02 geodetic datum. No adjustment between the GPS and GLONASS reference frames are made for positioning. Multiple messages are transmitted, one for each SVID with data.

Message ID: 723

Log Type: Asynch

Recommended Input:

log gloephemerisa onall

Example:

#GLOEPHEMERISA,USB1,11,54.0,SATTIME,2209,505128.000,02000020,8d29,16809;
51,0,1,1,2209,504918000,10782,864,0,0,93,0,-7.5577602539062500e+06,
-2.3962225585937500e+07,-4.3375678710937500e+06,1.0131835937500000e+02,
6.0211277008056641e+02,-3.4957332611083984e+03,-3.72529029846191400e-06,
-0.00000000000000000,1.86264514923095700e-06,-2.57240608334541320e-05,
5.587935448e-09,-0.00000000000000000,83910,3,2,0,28*50758dd7

#GLOEPHEMERISA,USB1,10,54.0,SATTIME,2209,498978.000,02000020,8d29,16809;
43,3,1,255,2209,499518000,10782,864,0,0,87,0,-7.5618266601562500e+06,
1.5146657226562500e+07,1.9069082519531250e+07,-2.2061262130737305e+03,
1.4006929397583008e+03,-1.9885673522949219e+03,1.86264514923095700e-06,
-0.00000000000000000,-2.79396772384643550e-06,4.82378527522087090e-05,
2.793967724e-09,-1.81898940354585640e-12,77760,3,3,0,28*a8ca7563

...

#GLOEPHEMERISA,USB1,1,54.0,SATTIME,2209,502428.000,02000020,8d29,16809;
44,12,1,255,2209,503118000,10782,864,0,0,91,0,1.8421777343750000e+05,
1.3962225585937500e+07,2.1379985351562500e+07,-2.0501766204833984e+03,
2.0764226913452148e+03,-1.3450326919555664e+03,9.31322574615478510e-07,
-0.00000000000000000,-2.79396772384643550e-06,-3.50531190633773800e-05,
1.862645149e-09,9.09494701772928230e-13,81210,3,1,0,12*30d2e4f1

#GLOEPHEMERISA,USB1,0,54.0,SATTIME,2209,505128.000,02000020,8d29,16809;
45,13,1,1,2209,504918000,10782,864,0,0,93,0,9.6398046875000000e+06,
5.4337807617187500e+06,2.3045452148437500e+07,-1.9557723999023438e+03,
2.4541549682617188e+03,2.3801517486572266e+02,9.31322574615478510e-07,
0.00000000000000000,-2.79396772384643550e-06,6.50892034173011770e-05,
-3.725290298e-09,0.00000000000000000,83910,3,2,0,28*9489ad94

Field

Field type

Description

Format

Binary Bytes

Binary Offset

1

Log header

GLOEPHEMERIS header

For information about log headers, see ASCII, Abbreviated ASCII or Binary.

 

H

0

2

sloto

Slot information offset - PRN identification

(Slot + 37). This is also called SLOTO in Connect

Ushort

2

H

3

freqo

Frequency channel offset for satellite in the range 0 to 20

Ushort

2

H+2

4

sat type

Satellite type where

0 = GLO_SAT

1 = GLO_SAT_M (M type)

2 = GLO_SAT_K (K type)

Uchar

1

H+4

5

Reserved

1

H+5

6

e week

Reference week of ephemeris (GPS reference time)

Ushort

2

H+6

7

e time

Reference time of ephemeris (GPS reference time) (ms)

Ulong

4

H+8

8

t offset

Integer seconds between GPS and GLONASS time. A positive value implies GLONASS is ahead of GPS reference time.

Ulong

4

H+12

9

Nt

Calendar number of day within 4 year interval starting at Jan 1 of a leap year

Ushort

2

H+16

10

Reserved

 

1

H+18

11

 

1

H+19

12

issue

15 minute interval number corresponding to ephemeris reference time

Ulong

4

H+20

13

health1

Ephemeris health where

0-3 = GOOD

4-15 = BAD

Ulong

4

H+24

14

pos x

X coordinate for satellite at reference time (PZ-90.02) (m)

Double

8

H+28

15

pos y

Y coordinate for satellite at reference time (PZ-90.02) (m)

Double

8

H+36

16

pos z

Z coordinate for satellite at reference time (PZ-90.02) (m)

Double

8

H+44

17

vel x

X coordinate for satellite velocity at reference time (PZ-90.02) (m/s)

Double

8

H+52

18

vel y

Y coordinate for satellite velocity at reference time (PZ-90.02) (m/s)

Double

8

H+60

19

vel z

Z coordinate for satellite velocity at reference time (PZ-90.02), (m/s)

Double

8

H+68

20

LS acc x

X coordinate for lunisolar acceleration at reference time (PZ-90.02), (m/s/s)

Double

8

H+76

21

LS acc y

Y coordinate for lunisolar acceleration at reference time (PZ‑90.02) (m/s/s)

Double

8

H+84

22

LS acc z

Z coordinate for lunisolar acceleration at reference time (PZ‑90.02) (m/s/s)

Double

8

H+92

23

tau_n

Correction to the nth satellite time t_n relative to GLONASS time t_c (s)

Double

8

H+100

24

delta_tau_n

Time difference between navigation RF signal transmitted in L2 sub-band and navigation RF signal transmitted in L1 sub-band by nth satellite (s)

Double

8

H+108

25

gamma

Frequency correction (s/s)

Double

8

H+116

26

Tk

Time of frame start (since start of GLONASS day) (s)

Ulong

4

H+124

27

P

Technological parameter

Ulong

4

H+128

28

Ft

User range

Ulong

4

H+132

29

age

Age of data (days)

Ulong

4

H+136

30

Flags

Information flags, see Table: GLONASS Ephemeris Flags Coding

Ulong

4

H+140

31

xxxx

32-bit CRC (ASCII and Binary only)

Ulong

4

H+144

32

[CR][LF]

Sentence terminator (ASCII only)

-

-

-
GLONASS Ephemeris Flags Coding

Nibble Number

Bit

Description

Range Values

Hex Value

N0

0

P1 Flag - Time interval between adjacent values of (tb) parameter in minutes

See Table: P1 Flag Range Values

00000001

1

00000002

2

P2 Flag - Flag of oddness or evenness of the value of (tb) (for intervals of 30 or 60 minutes)

0 = even

1 = odd

00000004

3

P3 Flag - Number of satellites with almanac information within current subframe

0 = four

1 = five

00000008

N1

4

P4 Flag - Flag to show that ephemeris parameters are present. "1" indicates that updated ephemeris or frequency/time parameters have been uploaded by the control

0 = no updated ephemeris

1 = updated ephemeris present

00000010

5 ... 7

Reserved

 

 

N2
through
N7

8
...
31

Reserved

    
P1 Flag Range Values

State

Description

00

0 minutes

01

30 minutes

10

45 minutes

11

60 minutes