GSSI 200 HS, Руководство пользователя

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Geophysical Survey Systems, Inc. GS Series
200 HS Antenna
MN27-151 Rev A 15
Setting Up for Data Collection
This section will get you set up to collect data with a GS Series antenna in either distance, time, or point-
based mode. For this section, we are assuming data collection with a Panasonic G1 Tablet.
To begin, you will need to insert a battery into the antenna’s battery port and press the power button on
the antenna.
Wait for the power light to flash before starting the GS Series software .
1
Tap the software icon on your tablet to get started.
2
Select the HS Module SSID on the collect side of the screen. This will connect the antenna to the
tablet.
3
The next screen is the setup screen. Data will scroll continuously as you make adjustments, but it will
not be saved until you hit the red circle icon . It is important to spend some time here and make sure
you are ok with the adjustments on your antenna before collecting data.
4
Tap on the Global/Project Menu Stack to check your Project parameters.
•
Check the Project Folder and adjust the title if needed.
•
Check the Save Prompt and GPS and adjust if needed.
5
Next, tap on the File Parameters Menu Stack. In the Scan area, we are most concerned with:
• Collect Mode
o
Time - No survey wheel, emitting scans/second continuously
o
Distance - Using a survey wheel, transmitter triggered by wheel movement
o
Point - Collecting one scan at a time when prompted, able to stack many scans together to
reduce noise.
• Vertical Scale
– Depth or Time
o
When using Depth, we are concerned with setting a Depth of penetration. We also have
access to Soil Types which assist in setting a rough estimate of the dielectric constant.
o
When using Time, we are using the Time Range to set the “depth” of penetration.
Regardless of the method you use to set penetration depth, you’ll want to look at the scan to set it
properly. There will be a point where the scan starts to appear fuzzy. This is the maximum depth of
penetration for your antenna in the survey site. When adjusting your depth, we recommend setting it such
that the bottom 10-20% of the screen is static/fuzz.
• Dielectric
– this value is used to convert the RADAR two-way-travel-time into a depth on the
screen. It is crucial to set this accurately in order to obtain accurate depths to features. If your vertical
scale is set to Depth, you can use the Soil Types to help. There are ways to calibrate it further in the
field with focus and ground truth.
• Depth/Time Range
– see Vertical Scale above for details.
• Samples/Scan
– multiply your Time Range by 10 and divide by 2.5. Use a Samples/Scan set higher
than this value. If your Vertical Scale is set to Depth, toggle it to Time to see this value. Feel free to
switch it back after.
• Scans/Second
o
For Collect Mode – Time, this is your data collection speed. Calculate this value by
considering how many scans/ft or scans/m traveled are required to resolve your targets, as
well as your movement speed. A good default is 50 scans/second.