User's Manual
Table Of Contents
- 5 Data Collection Mode
- 6 Surveying Techniques
- 6.1 Low Frequency Reflection (Profiling) Mode
- 6.2 High Frequency Reflection (Profiling) Mode
- 6.3 Antenna Orientation
- 6.4 Triggers
- 6.5 Free Run
- 6.6 Odometer Data Acquisition
- 6.7 Signal Polarity
- 6.8 Spatially Aliasing the Data
- 6.9 Creating a Test Line for Data Quality
- 6.10 Adding GPS for Positioning
- 6.11 Common Mid-Point (CMP) Survey
- 6.12 Transillumination Surveys
- 7 Troubleshooting
- 8 File Management
- 9 Care and Maintenance
- 10 Helpful Hints
- Appendix A: Data File Formats
- Appendix B: GPR Signal Processing Artifacts
- Appendix C: Excerpts from the HP Fiber Optic Handbook
- Appendix D: Health & Safety Certification
- Appendix E: FCC Regulations
- Appendix F: Instrument Interference
- Appendix G: Safety Around Explosive Devices
Appendix B: GPR Signal Processing Artifacts pulseEKKO PRO
B-4
Other Types of Filters
For dealing with the inductive wow response, high pass filtering is necessary. If an alternative high pass
filter is available or the user wishes to try a different type of high pass filtering, the raw data contains all of
the information and experimentation can be carried out using the raw data.
A DC removal can also be used to remove a DC level from all the traces in the input data set. This is done
by taking all the points in each trace and calculating the average signal level for that trace. This value is
then subtracted from each point in the trace. This process is repeated for each trace in the data set.
Typically, traces will have approximately the same DC shift in a given data set.
DC removal, in some cases, can be used instead of DEWOW. For example, a DC shift correction applied
to high frequency radar data rather than a DEWOW correction may be more effective in reducing artifacts.
If you are unsure about which correction to apply use DEWOW.