LDI DIGISONDE 4D - SBF Format: File Specification

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
5-76 SECTION 5 - SYSTEM SOFTWARE – ANNEX C
5:158.
Table 5C- 42: RSF PRELUDE Byte Organization
Byte #
Description
Units
Range
Accuracy
Precision
Type
Format
1
high
nibble
Polarization
-
3 (O)
2 (X)
-
-
BCD nibble
1 digit
low
nibble
Group size
encod-
ed
2 (262),
3 (504),
4 (1004)
-
-
BCD nibble
1 digit
2, 3
Frequency
Reading
10 kHz
within the ionogram
frequency range
10 kHz
10 kHz
packed BCD
4 digits
4
high
nibble
Offset
encod-
ed
0 (-20 kHz)
1 (-10 kHz)
2 (no offset)
3 (+10 kHz)
4 (+20 kHz)
5 (search failure)
E (forced)
F (no transmission)
-
-
nibble
Z1
low
nibble
Additional
Gain
3 dB
0-15
3 dB
3 dB
nibble
Z1
5
Seconds
sec
00-59
1
1
packed BCD
2 digits
6
Most Probable
Amplitude
3 dB
0-31
3 dB
3 dB
packed BCD
2 digits
5:159. The last block of an RSF ionogram may be incomplete. To indicate END-OF-IONOGRAM (EOI), a 6-
byte EOI marker consisting of EE(hex) is put on place of the PRELUDE.
SBF Format: File Specification
5:160. The SBF ionogram file consists of a variable number of 4096 byte blocks. Each block contains a
Header and a variable number of Frequency Groups. The SBF Header structure is described in Table 5C- 43.
Table 5C- 43: The SBF Header
Item
Description
Units
Range
Accuracy
Precision
Type
Format
Record Type
block identification
-
3 (first block)
2 (all other blocks)
exact
exact
char
(1 byte)
Z2
Header Length
total number of bytes
taken by Header
-
60, fixed
exact
exact
char
(1 byte)
I2
Version Marker
Version control char
-
FF (hex), fixed
-
-
char
(1 byte)
Z2
General Purpose
PREFACE
See Table 5C- 37
5:161. Each Frequency group contains a 6-byte PRELUDE and a single height profile of a variable length.
Table 5C- 44 summarizes the possible settings of Frequency Group lengths.