ITSPECTRALANALYSIS
Enable and configure spectral analysis on receiver
Platform: 
OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7 
Use this command to view the spectrum in a range of frequencies. The ITSPECTRALANALYSIS command enables and configures the spectral analysis. The spectrum is viewed by plotting the PSD samples in the ITPSDFINAL log.
Decreasing the update period or increasing the FFT size will impact receiver idle time. The idle time should be monitored to prevent adverse effects on receiver performance.
Due to the high volume of data, a higher bandwidth medium, such as USB or Ethernet, is recommended when monitoring signals using the Interference Toolkit.
To enable and configure spectral analysis on the secondary antenna of dual antenna receivers (OEM7720, PwrPak7D, PwrPak7DE1, PwrPak7DE2 and CPT7), use the ITSPECTRALANALYSIS_1 command.
Message ID: 1967
Abbreviated ASCII Syntax:
ITSPECTRALANALYSIS mode [frequency] [updateperiod] [FFTsize] [timeavg] [integration_window]
Factory Default:
ITSPECTRALANALYSIS off
ASCII Example:
ITSPECTRALANALYSIS predecimation gpsl1 500 1K 20 1
Field 
Field Type 
ASCII Value 
Binary Value 
Description 
Format 
Binary Bytes 
Binary Offset 

1 
ITSPECTRAL 
 
 
Command header. See Messages for more information. 
 
H 
0 
2 
mode 
Set the view mode. 
Enum 
4 
H 

3 
frequency 
Set the frequency band to view. 
Enum 
4 
H+4 

4 
updateperiod 
50 to 100000 
The spectrum update rate in milliseconds. The update period is limited by the FFT size chosen. For 32k the minimum update period is 100 ms and for 64k the minimum update period is 200 ms. (default = 1000) 
Ulong 
4 
H+8 

5 
FFTsize 
See Table: FFT Sizes 
The frequency resolution of the spectrum. (default = 1k) 
Enum 
4 
H+12 

6 
timeavg 
0 to 50 
Time averaging window in seconds. 0 means no time averaging. (default = 10) 
Ulong 
4 
H+16 

7 
integration window 
1 to 1024 
The integration window size of FFT samples. 1 means no integration. (default = 5) 
Ulong 
4 
H+20 
The postfilter spectrum is not available for the Galileo AltBOC frequency. Only the predecimation and postdecimation spectrums are available for Galileo AltBOC.
Binary Value 
ASCII Value 
Description 

0 
GPSL1 
GPS L1 frequency 
1 
GPSL2 
GPS L2 frequency 
2 
GLONASSL1 
GLONASS L1 frequency 
3 
GLONASSL2 
GLONASS L2 frequency 
4 
Reserved 

5 
GPSL5 
GPS L5 frequency 
61 
LBAND 
Inmarsat LBand frequency 
7 
GALILEOE1 
Galileo E1 frequency 
8 
GALILEOE5A 
Galileo E5A frequency 
9 
GALILEOE5B 
Galileo E5B frequency 
10 
GALILEOALTBOC 
Galileo AltBOC frequency 
11 
BEIDOUB1 
BeiDou B1 frequency 
12 
BEIDOUB2 
BeiDou B2I frequency 
13 
QZSSL1 
QZSS L1 frequency 
14 
QZSSL2 
QZSS L2 frequency 
15 
QZSSL5 
QZSS L5 frequency 
16 
QZSSL6 
QZSS L6 frequency 
17 
GALILEOE6 
Galileo E6 frequency 
18 
BEIDOUB3 
BeiDou B3 frequency 
19 
GLONASSL3 
GLONASS L3 frequency 
20 
NAVICL5 
NavIC L5 frequency 
21 
BEIDOUB1C 
BeiDou B1C frequency 
22 
BEIDOUB2A 
BeiDou B2a frequency 
23 
BEIDOUB2B 
BeiDou B2b frequency 
The 64k FFT is not available in postdecimation or postfilter modes.