Wavecom PXGF streaming format (GEW) V1.24 - Manual (Page 16)

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GSY-0D8-SE RESTRICTED Interface Requirement Specification for PXGF Streaming and File Format
Element Type Description
iTextLength int32 The number of characters in the text message
ayMessage byte[iTextLength] Text encoded using ISO-8859-1.
byte[] Zero padding to ensure word alignment of chunk.
Table 3.18: The TEXT chunk
3.5 PROPOSED EXTENSIONS
3.5.1 UTF-8 string – UTF8 chunk
Text chunk using UTF-8 encoding. It may be desirable to be able to store text messages using
different formats, eg UTF-8 etc.
Element Type Description
ayUTF8 byte[] Text encoded using UTF-8. The byte array is to be
padded to ensure word alignment.
Table 3.19: Proposed UTF8 chunk
3.5.2 IF frequency – IF__ chunk
Some systems require data to be played back at the original IF frequency used by the receiver. As the
sampled data is already at baseband the IF frequency doesn't provide any information about the signal
useful for analysis. This chunk could also cause confusion if the data were not at baseband, but rather
offset to some frequency as occurs when using some demodulators in SSB mode. This special case is
currently dealt with using the BWOF chunk.
Element Type Description
lIfFrequency_uHz int64 The IF frequency of the signal in micro Hertz
Table 3.20: Proposed IF__ chunk
3.5.3 Proposed text chunks
• Location of recording - TLOC.
• Equipment used to generate file - TREQ.
• Name of operator – TNOP.
3.5.4 Direction data chunk
1. Timestamp for start of first sample
2. Frequency of the first bin
3. Bin resolution
4. Number of bins
5. Azimuth/Elevation pairs encoded as shorts
3.6 DEPRECATED CHUNK TYPES
3.6.1 Start Of Header – SOF_ chunk. Use SOFH chunk instead
Used to denote the start of the header in a PXGF file. The presence of this chunk can be used to
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2009-01-13 RESTRICTED Page 15
Issue 1.24