number 64 is added to each byte to set the seventh bit. Binary numbers are transmitted MSB
(most significant bit) first.
Pseudobinary formats are preferred for GOES and Meteosat/EUMETSAT self-timed transmissions
because users can include more data in the GOES message. This allows more data to be
transmitted in a specific window of transmission time.
NOTE:
These messages are not human readable and need to be decoded by computer software or
by using custom decoding tables.
Because only 6 bits are used in each byte, the range that a byte or series of bytes can represent is
diminished (
Table A-4: Pseudobinary ranges
Pseudobinary type
Range
1-byte encoded unsigned integer
0 to +63
1-byte encoded signed integer
–32 to +31
2-byte encoded unsigned integer
0 to +4094
2-byte encoded signed integer
–2048 to +2047
3-byte encoded unsigned integer
0 to +262143
3-byte encoded signed integer
–131072 to +131071
4-byte encoded unsigned integer
0 to +16777215
4-byte encoded signed integer
–8388608 to +8388607
A.2.1 Campbell Scientific FP2 data
The FP2 data format uses 16 bits to represent a variable-precision floating point number. FP2 has
a total range of -7999 to 7999 and variable precision of 0.001 to 1. It also has the ability to signal
+/– INF and NAN, most commonly used to indicate a computational or measurement error.
(p. 30)) shows the numeric ranges and precision;
(p. 30) describes the bits,
and
(p. 30) provides bit usage in calculating a finished value.
TX326 Satellite Transmitter for METEOSAT
29
