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orb:c94-m8p [2016/07/06 11:20] raffael [First test (5.7.16)] |
orb:c94-m8p [2016/08/15 13:41] (current) sam [Rover Coordinates] |
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- | ====== C94-M8P-2 Application Board (dGPS) | + | ====== Introduction to C94-M8P ====== |
+ | One of the two boards is configured as a "Base Station" | ||
+ | |||
+ | ===== C94-M8P-2 Application Board (dGPS) ===== | ||
* **Pay special attention to ESD protection!** | * **Pay special attention to ESD protection!** | ||
Line 8: | Line 11: | ||
* Follow guide [1] to setup " | * Follow guide [1] to setup " | ||
* UBX-CFG " | * UBX-CFG " | ||
- | | + | |
- | * RPA 0.1m | + | |
+ | ==== Configure Base Station ==== | ||
+ | there are three steps to configure the Base Station. | ||
+ | - Set the position, by having the Base Station do a Survey-in or pre-surveyed coordinate | ||
+ | - Set-up the port for the Radio Link Port configuration | ||
+ | - Select RTCM messages for transmission | ||
+ | |||
+ | Before you get in the configuration, | ||
+ | Once the software started, click on the arrow right to the connect button (see image below) and click on the correct com port. The icon should be green after this step. The next image shows what it should looks like (After a while). | ||
+ | {{ : | ||
+ | |||
+ | === Base Station Coordinates === | ||
+ | |||
+ | For most of the things, two buttons keep most of the useful things {{ : | ||
+ | The one on the left provide information from the Base Station, i.e. for the survey-in. The one on the right allow to change Base Station parameters. | ||
+ | |||
+ | === Parameters === | ||
+ | Most of the parameters are the default one. We only will talk about the changes. | ||
+ | |||
+ | * DGNSS | ||
+ | * Differential set to 3=RTK Set to fixed (see below for explanation) | ||
+ | * NAV5 | ||
+ | * Dynamic Model Stationary | ||
+ | * NMEA | ||
+ | * NMEA Version set to 4.1 (As documentation recommend) | ||
+ | * PRT | ||
+ | * Target UART1 | ||
+ | * Protocol in NMEA+UBX | ||
+ | * Protocol out NMEA+UBX+RTCM3 | ||
+ | * RST | ||
+ | * Hotstart | ||
+ | * TMODE3 | ||
+ | * Mode Survey-in | ||
+ | | ||
+ | * RPA set to 0.0500m | ||
+ | === RTK Float vs RTK fixed === | ||
+ | |||
+ | The GPS system typically returns results in three different modes. In order of increasing accuracy, these are autonomous, RTK float and RTK fixed. Autonomous means the GPS rover is not receiving corrections from the base station radio, due to problems at the base station, baseline distance or topography. This mode don't concerns us at the moment of writing those lines. RTK float is similar to autonomous, in that it is a stand-alone mode. While the rover is receiving corrections from the base station in this mode, it either cannot see enough satellites to make an accurate calculation, | ||
+ | Those reason push us to set the DGNSS parameter to fixed RTK. | ||
+ | |||
+ | ==== Rover Coordinates ==== | ||
+ | To connect to the rover GPS do the same thing as for the Base Station | ||
+ | |||
+ | === Parameters === | ||
+ | Also here, most of the parameters are the default one. We only will talk about changes. | ||
+ | * DGNSS | ||
+ | * Differential set to 3=RTK Set to fixed | ||
+ | * NAV5 | ||
+ | * Dynamic Model Portable | ||
+ | * NMEA | ||
+ | * NMEA Version set to 4.1 (As documentation recommend) | ||
+ | * PRT | ||
+ | * Target UART1 | ||
+ | * Protocol in RTCM3 | ||
+ | * Protocol out NMEA (for SBC) | ||
+ | * RST | ||
+ | * Coldstart | ||
+ | * UBX-CFG-ODO | ||
+ | * enable low speed COG | ||
+ | * output speed | ||
+ | * output heading | ||
+ | |||
+ | === How do I know when the survey-in stop === | ||
+ | |||
+ | Click on the left button described above, then navigate to UBX -> NAV -> SVIN | ||
+ | On this page, you will be able to check survey-in state. | ||
+ | <note important> | ||
==== First test (5.7.16) ==== | ==== First test (5.7.16) ==== | ||
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Screenshot shows test with manual displacement. Base station was surveyed-in but turned off again for some time before this test. | Screenshot shows test with manual displacement. Base station was surveyed-in but turned off again for some time before this test. | ||
{{: | {{: | ||
- | |||
===== References ===== | ===== References ===== | ||
- https:// | - https:// | ||
- https:// | - https:// |