User's Manual

Table of Contents pulseEKKO PRO
iv
5.4.2 Fiducial Markers for GPS...............................................................73
5.5 Data Collection Pause Menu .....................................................................73
5.5.1 Exit .................................................................................................73
5.5.2 Continue.........................................................................................73
5.5.3 Scale ..............................................................................................73
5.5.4 Calib - Velocity Calibration.............................................................75
5.5.4.1 Hyperbola Matching..............................................................75
5.5.4.2 Identifying Air Reflections......................................................77
5.5.4.3 Target of Known Depth .........................................................78
5.6 Collect Grid Data........................................................................................79
5.6.1 Select Line Direction......................................................................79
5.6.2 Select Grid Line Number ...............................................................79
5.7 View Previously Collected Lines................................................................80
5.8 Collect Data (No Save) ..............................................................................81
6 Surveying Techniques .............................................................................82
6.1 Low Frequency Reflection (Profiling) Mode ..............................................82
6.1.1 Two Person Operation...................................................................82
6.1.2 One Person Operation...................................................................83
6.1.3 Strain Relief for Fibre Optic Cables...............................................84
6.1.4 Maintaining Proper Antenna Separation .......................................84
6.1.5 Antenna Movement........................................................................85
6.2 High Frequency Reflection (Profiling) Mode .............................................85
6.2.1 Tow Mode Operation .....................................................................85
6.3 Antenna Orientation...................................................................................86
6.4 Triggers ......................................................................................................87
6.5 Free Run ....................................................................................................87
6.6 Odometer Data Acquisition........................................................................88
6.6.1 Skipping Traces .............................................................................88
6.6.2 Backing up to Pinpoint Target Positions........................................89
6.7 Signal Polarity ............................................................................................89
6.8 Spatially Aliasing the Data.........................................................................89
6.9 Creating a Test Line for Data Quality ........................................................90
6.10 Adding GPS for Positioning .......................................................................90
6.11 Common Mid-Point (CMP) Survey ............................................................91
6.12 Transillumination Surveys..........................................................................93