A GPS receiver or a GNSS receiver is one of the main parts of a GPS land survey kit. There are different brands of GPS devices and there are different ways to use GPS land surveying equipment.
When there is a network of GPS base stations, then a GNSS receiver can be used as a GPS rover. The correction data needed for centimeter accurate positioning can be send then by a NTRIP caster. The GNSS receiver uses the RTCM messages to determine the exact position.
With our software, like Apglos Survey Wizard, you can work two ways with this GPS network rover.
The first option is to have a sim card in the Android device were our software is installed. When connection our survey software to the GPS receiver you have to fill in the NTRIP data, like IP address, port, username, password and data stream. When a bluetooth connection is made our land survey apps send the RTCM messages to and from the NTRIP caster and GNSS receiver.
Some GNSS receivers don’t have this option. So there is another option. In a lot of GPS receivers you can insert a sim card. Then after you can fill the NTRIP data in the GNSS receiver. This way the data connection between the NTRIP caster and the GPS rover is straight forward. When you connect our survey software with the GPS rover with bluetooth then you get the exact position.
This method is for our software not different from the second option with the network rover. The corrections come from the GPS base station and are send straight to the GPS rover. Our land survey apps receive the exact positioning data through NMEA via Bluetooth.
Our land survey software is based on connect and go. So when you connect to the GNSS receiver then it should work right away. And it does. Our land survey apps will be running as long as the GPS receiver sends the following NMEA strings via Bluetooth:
For the data send through NMEA there are preset processes. It is the same for all GPS receivers. Also the way NTRIP and the RTCM messages are send is well documented.
There are many producers of GPS receivers and GNSS receivers. They have all their own protocol to make a connection to a handheld or Android device.
That is why we want to help you to connect our land survey apps to as many GPS receivers as possible. Here are the GNSS receivers that we could connect to. If your GPS receiver is not there please contact us.