BDSBCNAV2EPHEMERIS

Decoded BDS B-CNAV2 ephemeris

Platform:

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

This log provides the Decoded BDS B-CNAV2 ephemeris for the BeiDou B2a signals.

Message ID: 2372

Log Type: Asynch

Recommended Input:

log bdsbcnav2ephemerisa onall

Example log:

#BDSBCNAV2EPHEMERISA,USB1,6,63.5,SATTIME,2209,496514.000,02000020,21df,16809;
34,853,00000000,25,493200,3,25.591797,0.006489,3.8598036335e-09,
-5.7266440902e-14,-1.169634521,6.7982793553e-04,0.749691829,2.199470739e+00,
9.6205966277e-01,-6.88135806e-09,-3.976951370e-10,3.259629011e-08,
-3.166496754e-08,-104.0195313,198.4492188,8.173286915e-06,-5.176290870e-06,
25,493200,-4.04388702e-04,8.52029558e-12,0.00000000,-3.085006028e-09,
-1.635635272e-08,-2.735760063e-09,0*ecfc685f

#BDSBCNAV2EPHEMERISA,USB1,5,63.5,SATTIME,2209,496514.000,02000020,21df,16809;
39,853,00000000,25,493200,2,5263.894531,-0.062899,7.7092496926e-10,
1.9584381616e-13,-2.140521199,2.2453696001e-03,-2.871042649,-9.3801678773e-01,
9.6155928554e-01,-1.86489911e-09,-1.102724504e-09,-4.284083843e-08,
4.004687071e-08,-83.8671875,-507.8242188,2.449937165e-05,-3.319233656e-06,
25,493200,3.49998591e-05,3.10862447e-14,0.00000000,7.799826562e-09,
-1.426087692e-08,-2.502929419e-09,0*4bceb44d

...

#BDSBCNAV2EPHEMERISA,USB1,1,63.5,SATTIME,2209,496514.000,02000020,21df,16809;
24,853,00000000,25,493200,3,19.027344,0.006292,3.9494502247e-09,
-6.8209628314e-14,1.247259053,4.9585988745e-04,0.517626996,1.3024422419e-01,
9.4798221860e-01,-6.90885921e-09,3.485859486e-10,2.421438694e-08,
-5.587935448e-09,115.0976563,154.5429688,9.900890291e-06,5.632638931e-06,
25,493200,-9.63939528e-04,-4.78550533e-12,0.00000000,1.175794750e-08,
-1.484295353e-08,-2.502929419e-09,0*f6bbff08

#BDSBCNAV2EPHEMERISA,USB1,0,63.5,SATTIME,2209,496514.000,02000020,21df,16809;
26,853,00000000,25,493200,3,107.203125,-0.005850,3.7798003010e-09,
4.1571032661e-14,2.051998724,7.3472585063e-04,0.436791966,1.0602762178e-01,
9.4940386191e-01,-6.82564146e-09,3.775157250e-10,-3.166496754e-08,
-3.073364496e-08,103.6250000,136.3750000,1.077353954e-05,5.120411515e-06,25,
493200,7.38367089e-04,-5.27311528e-12,0.00000000,0.000000000,-1.699663699e-08,
-2.561137080e-09,0*bf8175af

Field

Field Type

Description

Format

Binary Bytes

Binary Offset

1

Log header

BDSBCNAV2EPHEMERIS header

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

–

H

0

2

Satellite ID

ID/ranging code

Ulong

4

H

3

WN

Week number in BeiDou time (BDT).

This will be offset from GPS time by 1356 weeks.

Ulong

4

H+4

4

Satellite Status

Satellite Status Information:

Bits 0 to 1: Health Status (HS)

Bit 2: Data Integrity Flag (DIF)

Bit 3: Signal Integrity Flag (SIF)

Bit 4: Accuracy Integrity Flag (AIF)

Bits 5 to 8: Signal In Space Monitoring Accuracy Index (SISMAI)

Hex Ulong

4

H+8

5

IODE

Issue of data, ephemeris

Ulong

4

H+12

6

toe

Reference time of ephemeris parameters in BeiDou time (BDT). This will be offset from GPS time. (s)

Ulong

4

H+16

7

Satellite Type

2 bit orbit type:

01 indicates GEO,

10 indicates IGSO,

11 indicates MEO

Ulong

4

H+20

8

DeltaA

Semi-major axis difference at reference time (m)

Double

8

H+24

9

ADot

Change rate in Semi-major axis (m/s)

Double

8

H+32

10

DeltaN

Mean motion difference from computed value (radians/s)

Double

8

H+40

11

NDot

Rate of mean motion difference from computed value (radians/s2)

Double

8

H+48

12

M0

Mean anomaly at reference time (radians)

Double

8

H+56

13

e

Eccentricity (unitless)

Double

8

H+64

14

Omega

Argument of perigee (radians)

Double

8

H+72

15

Omega0

Longitude of ascending node of orbital of plane at weekly epoch (radians)

Double

8

H+80

16

i0

Inclination angle at reference time (radians)

Double

8

H+88

17

OmegaDot

Rate of right ascension (radians/s)

Double

8

H+96

18

i0Dot

Rate of inclination angle (radians/s)

Double

8

H+104

19

Cis

Amplitude of sine harmonic correction term to the angle of inclination (radians)

Double

8

H+112

20

Cic

Amplitude of cosine harmonic correction term to the angle of inclination (radians)

Double

8

H+120

21

Crs

Amplitude of sine harmonic correction term to the orbit radius (m)

Double

8

H+128

22

Crc

Amplitude of cosine harmonic correction term to the orbit radius (m)

Double

8

H+136

23

Cus

Amplitude of sine harmonic correction term to the argument of latitude (radians)

Double

8

H+144

24

Cuc

Amplitude of cosine harmonic correction term to the argument of latitude (radians)

Double

8

H+152

25

IODC

Issue of data, clock

Ulong

4

H+160

26

toc

Reference time of clock parameters in BeiDou time (BDT). (s)

This will be offset from GPS time by 14 seconds.

Ulong

4

H+164

27

a0

Constant term of clock correction polynomial (s)

Double

8

H+168

28

a1

Linear term of clock correction polynomial (s/s)

Double

8

H+176

29

a2

Quadratic term of clock correction polynomial (s/s2)

Double

8

H+184

30

TGDB1Cp

Group delay differential between the B1C pilot component and the B3I signal (s)

Double

8

H+192

31

TGDB2Ap

Group delay differential between the B2a pilot component and the B3I signal (s)

Double

8

H+200

32

ISCB2ad

Group delay differential between the B2a data and pilot components (s)

Double

8

H+208

33

Reserved

Ulong

4

H+216

34

xxxx

32-bit CRC (ASCII and Binary only)

Hex

4

H+220

35

[CR][LF]

Sentence Terminator (ASCII only)

–

–

–