RPS - Preparation
Use the Define Deadtime OR Livetime Parameters option (RPSFILT GX) to perform instrument deadtime corrections on airborne radiometric data. You can also use this dialog to apply a low pass filter to the radiometric and/or barometric altimeter data and correct the altimeter data to Standard Temperature and Pressure (STP).
Raw radiometric data in RAW channels are filtered and placed in FILT channels. To display filtered data, look for the channels that have FILT included in the channel name.
Define Deadtime OR Livetime Parameters dialog options
This is the first of two dialogs. Use this dialog to choose the method (i.e. deadtime or livetime) and to enter the instrument correction and to select the livetime channel.
Choose Deadtime or Livetime method from list |
Select the method from the list. |
INSTRUMENT DEADTIME (microseconds/pulse) |
The instrument deadtime (microseconds/pulse) The deadtime value is preset to 0 meaning that the correction is not applied. If you want to see the effect of deadtime corrections on the dataset, try entering another value (in microseconds). |
INSTRUMENT LIVETIME CHANNEL (milliseconds) |
Select the instrument livetime channel. |
Define Optional Low pass Filter Values dialog values
This is the second of two dialogs. Use this dialog to enter the filter values for cosmic, total count, potassium, uranium, thorium and the radar altimeter.
COSMIC: |
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TOTAL COUNT: |
LP Short Wavelength Cutoff (fiducials) (Default is 4.0) |
POTASSIUM: |
LP Short Wavelength Cutoff (fiducials) (Default is 5.0) |
URANIUM: |
LP Short Wavelength Cutoff (fiducials) (Default is 7.0) |
THORIUM: |
LP Short Wavelength Cutoff (fiducials) (Default is 7.0) |
RADAR ALTIMETER: |
LP Short Wavelength Cutoff (fiducials) ( Default is 5.0) |
Application Notes
This RPS Preparation dialog runs three processes -- deadtime correction,filter and altimeter correction. You must supply values for the first two processes. The last process is automatic.
By default, the low pass filter high frequency values are set from 4 –7 except for the Cosmic channel which is set to 35.0 for heavier filtering.
When you are finished setting all parameters, press OK. Once processing completes, we suggest that you compare the raw and filtered data (FILT channels) in the profile window. If you are not satisfied with the initial results, rerun the Preparation dialog and change the parameter values.
Additional Script Parameters
URAW |
Input U Channel Name |
KRAW |
Input K Channel Name |
THRAW |
Input TH Channel Name |
TCRAW |
Input TCount Channel Name |
COSRAW |
Input COSmic Channel Name |
BALTRAW |
Input BALT Channel Name |
RALTRAW |
Input RALT Channel Name |
CTEMP |
Input Temperature Channel Name |
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UFILT |
Output U Channel Name |
KFILT |
Output K Channel Name |
THFILT |
Output TH Channel Name |
TCFILT |
Output TC Channel Name |
COSFILT |
Output COS Channel Name |
RALTSTP |
Output RALT Channel Name |
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DEADTIME |
Equipment Deadtime |
LIVETIME |
Equipment Livetime Channel |
USWAV |
Short Wavelength Cutoff for U |
KSWAV |
Short Wavelength Cutoff for K |
THSWAV |
Short Wavelength Cutoff for TH |
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TCSWAV |
Short Wavelength Cutoff for TC |
COSSWAV |
Short Wavelength Cutoff for COS |
RALTSWAV |
Short Wavelength Cutoff for RALT |
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