Noggin 1000 Smart Cart, Руководство пользователя

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Smart Systems User’s Manual Version 1.1
45
GPS Setup Menu
The Global Positioning System (GPS) uses special satellites around the Earth to
determine the position of a GPS receiver located at any position on the surface of the
Earth. GPS receivers can be purchased from a number of manufacturers.
The DVL has a serial port on the back for attaching a GPS receiver. This port will
accommodate any GPS receiver that has a standard serial port output.
This feature allows GPS information to be logged while collecting Noggin data. The GPS
information may be useful for determining where a specific target of interest is located in
GPS co-ordinates.
The DVL can be set up to read and log GPS information collected during data
acquisition with the Noggin system. GPS information can be logged in two different
ways: 1) to display GPS information on the data image every certain number of data
traces collected by the Noggin system, or 2) to display GPS information on the data
image every time the user presses the A button during data acquisition.
In order for the DVL to read the GPS data string, the GPS settings for the specific GPS
receiver being used must be input into this menu. There are 4 important items that must
be specified correctly for the DVL to display the GPS strings. These items are Baud
Rate, Stop Bits, Data Bits and Parity. These are discussed in more detail below. The
default values listed below are the values that are typically used. Read the GPS
Receiver User’s Guide or experiment with the settings to find the correct ones.
Once these 4 items are set correctly you should be able to run System Test #1 and have
GPS information written to the screen.
When the logging of GPS information is enabled, during data acquisition a message will
appear in the bottom left-hand corner of the DVL screen indicating whether GPS data is
successfully being received (see Section 6.2.4).