Itpsdfinal - Novatel OEM6 Integration Manual

Chapter 2 New for OEM7 – Firmware

2.3.15 ITPSDFINAL

Processed power spectral density
Platform: OEM729, OEM719, OEM7700
The ITPSDFINAL log contains the samples for the spectral analysis. The rate and size is set by
the update period and the FFT size respectively when issuing the ITSPECTRALANALYSIS com-
mand (see page 46). The number of samples in each log is calculated by dividing the FFT
samples by 2. For instance, FFT size of 1K will have 1 log with 512 samples; FFT size of 64K will
have 32 logs with 1024 samples. This is due to the symmetrical nature of the FFT samples. The
output logs can be grouped together through the sequence number of the log header.
PSD samples are compressed into 2 byte samples to reduce log sizes. The range of values that
can be displayed is -200 dBm to +56 dBm with a 1/256 resolution. The following steps should be
performed on the PSD samples in this log to convert them back into dBm units for display pur-
poses:
1. Divide the sample by 256.0
2. Subtract 200
Message ID: 1968
Log Type: Asynch
Recommended Input:
log itpsdfinala onnew
ASCII Example
#ITPSDFINALA,UNKNOWN,0,66.0,FINESTEERING,1891,166978.221,02040000,b79a
,32768;1310752,1531.250,195312.500,512,28033,30370,30225,29190,27254,2
9521,32694,33025,28553,28902,29060,26663,30267,30054,
...
34027,38038,31082,29418,28805,27373,27869,28847,28331,31901,30251,3362
5,33625*000b928d
Field Field Type
ITPSDFINAL
1
header
2 status word
frequency
3
start
OEM6 to OEM7 Integration Guide v1
Description
Log header. See Messages for more
information.
Status word containing information about the
configuration of the spectral analysis (see
Table 38: Spectral Analysis Status Word on
the next page)
Frequency represented by first data sample
in MHz
Binary Binary
Format
Bytes Offset
- H 0
Ulong 4 H
Float 4 H+4
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