GSSI SIR 30 Operations

Updated: March 23, 2013

Step 1: Create a new project choosing a name for the survey and the SIR30 equipment, then click New Survey

Step 2: Transfer data into the \raw\ folder of the project by: browsing, then searching all the files in the SIR 30 data directory using *.* file type, and then clicking the import button to transfer the data. Windows Explorer can also be used as a substitute.

Step 3: Create the infomain.dat containing the names of the multiplexed radargrams and infochannels.dat file which will be the individual de-multiplexed radargram names. Click the extension to *.dzt, GPS survey, set the channel names and the xyz offsets, then click the Import \raw\ button.

Step 4: Highlight the infomain.dat file back in the Edit Info File. Choose the kind of navigation for GPS, e.g. GSSI to UTM for no *.tmf files collected, or GSSI Tstamp if *.plt and *.tmf are collected, or GSSI to Nav for total station.

Step 5: Demultiplex the SIR30 radargrams creating *-1.dzt, *-2.dzt, *-3.dzt, *-4.dzt for 4 channel data and write to the \raw\ folder of the project using the SIR30 32 to 16 bit operation. Set the binary head length 131072.

Step 6: Highlight the infochannel.dat file, and click Array to Nav for GPS collection to generated the navigation for each individual track based on the channel offsets.

Step 7: Use the GSSI 16 to 16 bit button to open the gaining and conversion menu. Choose a gain curve and then click batch gain-wobble operatioin to remove low freq noise. (Optionally, one can not apply gain and do bandpass filter or regaining in the Filter menu)

Step 8: Display the GPS track to make sure it looks good. Plot options labeling may be used to create customized labeling of eastings and northings.

Step 9: Apply the desired navigation. In this instance artificial markers are applied equidistantly across the data (without time stamp information from *.tmf).

Step 10: proceed as normal to Search 0ns if desired and the Slice/resample menu. Choose and appropriate resample scans/mark for the resampled radargrams.

From here follow general operations detailed in the main manual. Processes such as radargram editing may also be required for time 0 corrections which are all identified in the main manual for basic operations.