3.6. Input of GPS Measurements

3.6. Input of GPS Measurements

The Input > Measurements submenu includes the main screen for GPS surveying where the calculated coordinates and the status of the Rover receiver are shown. Alternatively, start the submenu with the quickstart button shown above.

The submenu shows the coordinates with their standard deviations (plane coordinates), number of GPS and GLONASS satellites, PDOP, antenna height (I.H.), radio link quality, the distance to the Base receiver (D), the ambiguity fixing status and the Rover dynamics.

To save the actual coordinates press the <Save>- or the <OK>-button.

The calculation of the ambiguities in the GPS receiver is influenced by the chosen dynamics. The dynamics describe the movement of the GPS antenna.

With the button >> the dynamics can be chosen from a list. Possible settings for TPS are "static" and "walking". For Ashtech-receivers there are "quasistatic", "walking", "automobile" ,”aircraft” and "ship" additions.

The button <Sat> shows detailed information about GPS/GLONASS satellites.

The <Ant.Height> button opens the submenu for the antenna height (see 3.3 Initialisation of the Base Receiver).

With the <Reset>-key a reset of the RTK engine is done. The fixing of the ambiguities is restarted.

By pressing the <Info> button a button strip is shown; if pressing these buttons further information from the GPS receiver are queried.

Supported functions:

<DRef>	This function reads the coordinates of the Base receiver from the RTCM messages and saves it. These coordinates are used to calculate the distance from the Rover to the Base receiver.
<Radio>	The status of the received correction data is displayed.
<Stat>	Statistic for the position calculation (TPS only)
<Extra>	Possibility to change the elevation mask and the environment type (forest or open plain) (TPS only)
<VRS>	Settings for virtual base station and ionosphere model. (TPS only)
<Vektor>	Absolute coordinates of base and rover in cartesian coordinates. If the checkbox Vectordata Recording is activated the correlations of the coordinates will be saved. (TPS only)
<Power>	Indication of the battery capacity. The voltage and the capacity as well as the maximum and remaining battery time are shown. (Ashtech Z-Surveyor only)
<Contrast>	Indication of the Contrast Ratio Value. The contrast value declares how reliable the fixing of the ambiguities is. Ashtech: Range from 0.00 up to 999.0. A value higher than 1.0 indicates that the ambiguities are fixed. (Ashtech only)