BDSBCNAV3EPHEMERIS

Decoded BDS B-CNAV3 ephemeris

Platform:

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

This log provides the decoded parameters from words 10 and 30 of the BeiDou B2b signals. The data includes orbital parameters, group delay, health, and other status information.

Message ID: 2412

Log Type: Asynch

Recommended Input:

log bdsbcnav3ephemerisa onall

Example log:

#BDSBCNAV3EPHEMERISA,USB1,6,50.5,SATTIME,2209,496718.000,02000020,070d,16809;
26,853,00000000,493200,3,107.203125,-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,
493200,7.38367089e-04,-5.27311528e-12,0.00000000,-1.565786079e-08,0*25ddf0a6

#BDSBCNAV3EPHEMERISA,USB1,5,50.5,SATTIME,2209,496718.000,02000020,070d,16809;
35,853,00000000,493200,3,-78.089844,0.004464,3.9608792722e-09,
-3.1478013195e-14,0.693860220,8.1312097609e-04,0.494353216,2.199361578e+00,
9.6212843381e-01,-6.96993318e-09,-4.284107022e-10,-1.210719347e-08,
3.632158041e-08,-136.6210938,203.5351563,7.832422853e-06,-6.644055247e-06,
493200,2.72334553e-04,1.74029680e-11,0.00000000,-1.315493137e-08,0*152a37f1

...

#BDSBCNAV3EPHEMERISA,USB1,1,50.5,SATTIME,2209,496719.000,02000020,070d,16809;
39,853,00000000,493200,2,5263.894531,-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,
493200,3.49998591e-05,3.10862447e-14,0.00000000,-1.268927008e-08,0*d3f6f534

#BDSBCNAV3EPHEMERISA,USB1,0,50.5,SATTIME,2209,496718.000,02000020,070d,16809;
44,853,00000000,493200,3,65.369141,-0.011349,3.8406956947e-09,1.0343710014e-13,
-0.198007475,8.3381979493e-04,0.582406796,2.199813208e+00,9.5949562234e-01,
-6.96636161e-09,-4.343038048e-10,-5.215406418e-08,-4.190951586e-08,
-118.6484375,212.3242188,7.395632565e-06,-5.853362381e-06,493200,
6.58427074e-04,1.22231114e-11,0.00000000,-1.204898581e-08,0*0c179456

Field

Field Type

Description

Format

Binary Bytes

Binary Offset

1

Log header

BDSBCNAV3EPHEMERIS 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

toe

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

Ulong

4

H+12

6

Satellite Type

2 bit orbit type:

01 indicates GEO,

10 indicates IGSO,

11 indicates MEO

Ulong

4

H+16

7

DeltaA

Semi-major axis difference at reference time (m)

Double

8

H+20

8

ADot

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

Double

8

H+28

9

DeltaN

Mean motion difference from computed value (radians/s)

Double

8

H+36

10

NDot

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

Double

8

H+44

11

M0

Mean anomaly at reference time (radians)

Double

8

H+52

12

e

Eccentricity (unitless)

Double

8

H+60

13

Omega

Argument of perigee (radians)

Double

8

H+68

14

Omega0

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

Double

8

H+76

15

i0

Inclination angle at reference time (radians)

Double

8

H+84

16

OmegaDot

Rate of right ascension (radians/s)

Double

8

H+92

17

i0Dot

Rate of inclination angle (radians/s)

Double

8

H+100

18

Cis

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

Double

8

H+108

19

Cic

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

Double

8

H+116

20

Crs

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

Double

8

H+124

21

Crc

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

Double

8

H+132

22

Cus

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

Double

8

H+140

23

Cuc

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

Double

8

H+148

24

toc

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

This will be offset from GPS time by 14 seconds.

Ulong

4

H+156

25

a0

Constant term of clock correction polynomial (s)

Double

8

H+160

26

a1

Linear term of clock correction polynomial (s/s)

Double

8

H+168

27

a2

Quadratic term of clock correction polynomial (s/s2)

Double

8

H+176

28

TGDB2Bi

Group delay differential between the B2bI and the B3I signal (s)

Double

8

H+184

29

Reserved

Ulong

4

H+192

30

xxxx

32-bit CRC (ASCII and Binary only)

Hex

4

H+196

31

[CR][LF]

Sentence Terminator (ASCII only)

–

–

–