Exchange format for the Interball RTT systems data.
1. File name
SYDDDPTR.NFF where
S - satellite's code: A .. Auroral, B .. Magion-5, U .. Magion-4
YDDD - session identifier: Y .. last figure of the year,
DDD .. day of the year
P - session part (the number of session in the appointed day)
T - code of telemetry: C .. RTT
R - mode of telemetry: 1 .. RTT 2 .. for memory files (not used)
N - code of reception station: 4 .. Tarusa (TAR)
8 .. Panská Ves (PAN)
FF - code of exchange format: 03 .. Auroral
04 .. Magion-5
42 .. Magion-4
2. File structure
Passport - 528 bytes
Frame 1 - 528 bytes
Frame 2 - 528 bytes
........ ..............
Frame N - 528 bytes
3. Passport structure
Bytes Number of C o n t e n t
bytes
1-4 4 number of record ( = 0 )
5-5 1 reserve
6-7 2 identifier of satellite (AZ..AURO, AS..M-5, TS..M-4)
8-10 3 receiving station identifier (PAN,TAR)
11-12 2 session identifier - YYDDD (*)
13-13 1 number of the session part - (1..N)
14-15 2 telemetry code - (C.)
16-19 4 number of TM frames in the session or the session part
20-20 1 reserve
21-24 4 number of frames with errors of frame length
25-28 4 reserve
29-29 1 number of data intervals (**)
30-33 4 frame number of the first interval of data
34-34 1 day date and time [UT]
35-35 1 month of the first frame of the first interval
36-37 2 year
38-38 1 hour
39-39 1 min
40-40 1 sec
41-42 2 msec
43-43 1 working mode code: 000 FF R PP, where
FF - bit rate (00,01,10,11..40,20,5,1.25 kbit)
R - 0 .. RAM, 1 .. ROM
PP - acquisition program number
(00, 01, 10, 11)
44-57 14 information similar to 30-43 bytes for the second interval
... .. ......................................
352-365 14 information similar to 30-43 bytes for
the 24-th interval, if present
366-379 14 information similar to 30-43 bytes for
the 25-th interval, if present
380-381 2 year Predicted time [UT]
382-383 2 month reference for SSNI
384-385 2 day (***)
386-387 2 hour
388-389 2 min
390-391 2 sec
392-393 2 msec
394-395 2 reserve
396-399 4 on-board time SSNI
400-403 4 coefficient of the on-board time escape relative
to the ground time (UT)*(10**9)
404-405 2 orbit number
406-526 121 reserve
527-528 2 standard TM voltage
4. Telemetry frame structure
Bytes Number of C o n t e n t
bytes
1-4 4 frame number (1,2,3,..N)
5-5 1 day
6-6 1 month
7-8 2 year date and time [UT]
9-9 1 hour of the frame
10-10 1 min
11-11 1 sec
12-13 2 msec
14-15 2 frame duration [msec]
16-16 1 coding of the frame error and structure:
b0 to b4 =0 .. no errors
b0 - structure error
b1 - error of checksum in subframe 0
b2 - 1
b3 - 2
b4 - 3
b5,b6 PP number of structure
b7 (MSB) R 0 .. RAM, 1 .. ROM
17-528 512 512 channels of frame STO (****)
-------------------------------------------------------------------------
Notes:
All 2-bytes and 4-bytes words are located in passport in the following way:
2-bytes: - b0,b1
4-bytes: - b0,b1,b2,b3, where b0 - LSB.
Character data are in ASCII code
* - Structure of 11-12 bytes:
YY - two last figures of the year (7 bits MSB);
DDD - day in the year (9 bits LSB)
** - a new data interval is determined by:
- change of the acquisition program (ROM/RAM, structure);
- change of data bit rate;
- large interval of data with error structure
*** - the SSNI information (bytes 380..403) is facultative
**** - data of 512 channels are the codes in telemetry units
(0-255) and are located according to the description
of the current RTT TM-frame for each satellite