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Network Orbit Data

Introduction/Additional information: 

This VDE Protocol Format may be used by VDE Satellites to inform about updated orbital data for a set of VDE-SAT satellites in a VDE-SAT network or VDE-SAT roaming network. Equipment may use the orbital data to estimate when connectivity to a satellite can be expected.


Orbital data is represented in the two-line element (TLE) format.

Permitted as from: 
01/12/2022
Registrant: 
IALA
Physical link: 
VDE-SAT
Message number (0=VDES-VDE): 
0
DAC or VPFI: 
1
FI / Message ID: 
0
Technical point of contact: 

IALA

G1117-Ed3.0-VHF-Data-Exchange-System-VDES-Overview

State: 
proposal
Number of slots (max): 
1
FEC: 
No
Last modified: 
29/03/2023 - 13:47
Details: 

Parameter

Number of bits

Description

VPFI

16

1

Message ID

8

0

Primary network ID

8

Values 0-255 allowed, see ITU-R M.2092-1, Annex 5, §3.1.9

Roaming network ID

8

Identifying which roaming network group the satellites of this list belong to.

n

8

Number of orbital data sets transferred in this VDE Protocol Format

Satellite ID[0]

8

ID [0] of the satellite

TLE [0]

828

TLE data[0] for the first satellite: 2 lines of 69 ASCII 6-bit encoded characters 

Satellite ID[1]

8

ID [1] of the satellite

TLE [1]

828

TLE data[1] for the second satellite: 2 lines of 69 ASCII 6-bit encoded characters 

…

…

…

Satellite ID[n-1]

8

ID [n-1] of the satellite

TLE [n-1]

828

TLE data[n-1] for the nth satellite: 2 lines of 69 ASCII 6-bit encoded characters 

Valid until

32

Unsigned integer number of seconds after the 1st of January

1970 00:00:00 UTC. After the 19th of January 2038 03:14:07

UTC, the number is the number of seconds after this new date (wraps around);

To avoid replay attacks, this value shall be used by the receiving application to verify the validity of the data.

Signature

512

Signature over above data, applied over all bits from the start of the VPI field to the end of the last bit, just before the signature, generated as described for the terrestrial bulletin board, see ITU-R M.2092-1, Annex 4, §4.15

Total number of bits

variable