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Precise Point Positioning (PPP)
To prepare, configure, and start a GNSS survey with PPP enabled.
Precise Point Positioning (PPP) is a centimeter level positioning engine that combines dual frequency code and carrier phase measurements by GNSS receiver and data on precise orbits and clocks of navigation satellites. PPP corrections data is broadcast to customer receivers in two ways:
- LBand - direct broadcasting from a satellite;
- NTRIP - Topnet Live broadcasting over the Internet, typical connection using cellular modem and SIM card data link.
MAGNET Field supports PPP engine in specific GNSS survey configurations:
Prerequisites for enabling PPP in GNSS receiver and MAGNET Field
- GNSS receiver with PPP support: NET G5, HiPer HR, HiPer VR, MR-2 or Sokkia GNR5, GRX3 with firmware version 5.4 or later. Open the Receiver Info dialog to view connected receiver's details (to open, click
>
>
>
).
- Valid Option Authorization File (OAF) loaded into GNSS receiver (click
>
>
>
to view OAF file loaded into the connected GNSS receiver).
- VPPP (Topnet Global) option for PPP corrections data broadcast via LBand satellite down link,
- VPPP (Topnet Global), SPPP (Topnet Live Source) and CRYP (Corrections Encryption) options for PPP corrections data broadcast over the Internet via NTRIP.
- Valid Starpoint™ subscription: Starpoint2 (GPS / GLONASS satellites data), Starpoint Pro (GPS / GLONASS / Galileo / BeiDou satellites data).
- Stable Internet connection with access to Topnet Live during survey with NTRIP connection over the Internet.
How to enable PPP in MAGNET Field
Create a GNSS survey configuration and pay attention to the PPP related dialogs and settings listed below:
In Automomous/SBAS survey configuration:
- In the Rover Receiver dialog, click
and select Receiver Setting from the dialog menu.
- In the open Receiver Setting dialog, check the Enable Starpoint™ box.
- Depending on OAF, subscription, and available communications, select how PPP data should be received: LBand or Network:
- LBand - PPP corrections data received via LBand satellite down link.
- If required, click the Advanced button to open the Starpoint™ dialog and select a specific LBand satellite manually.
- Network - PPP corrections data received via NTRIP connection over the Internet. Additional dialogs open later to setup this connection:
- In the Rover Radio dialog, choose a cellular modem for connection to the Internet.
- In the Internet Address dialog, configure the Topnet Live connection using IP address and port, login and password from your Starpoint™ subscription email.
- In the Modem Dialup dialog (opens, if Receiver modem is selected to connect to the Internet in the Rover Radio dialog), set up dial-up connection to the Internet provider.
- In the Solution fields of Topo Survey / Auto Topo Survey / Stake Settings dialogs, select PPPF and PPPN as desired solution type. More about solution types.
- In the Tracking dialog, ensure the constellations covered in Starpoint™ subscription are selected.
In Network RTK survey configuration:
- In the Rover Receiver dialog, click
and select Receiver Setting from the dialog menu.
- In the open Receiver Setting dialog, check the Enable Skybridge™ box.
- Depending on OAF, subscription, and available communications, select how PPP corrections data should be received: LBand or Network:
- LBand - PPP corrections data received via LBand satellite down link.
- If required, click the Advanced button to open the Skybridge™ dialog and select a specific LBand satellite manually.
- Network - PPP corrections data received via NTRIP connection over the Internet.
- In the Rover Radio dialog, choose a cellular modem for connection to the Internet.
- In the Internet Address dialog, configure the Topnet Live connection using IP address and port, login and password from your Starpoint™ subscription email.
- In the Modem Dialup dialog, (opens, if Receiver modem is selected to connect to the Internet in the Rover Radio dialog), set up dial-up connection to the Internet provider.
- In the Position in GGA dialog, check the Automatic Rover Pos box.
- In the Solution fields of Topo Survey / Auto Topo Survey / Stake Settings dialogs, select Fixed, PPPF and PPPN as desired solution type. More about solution types.
- In the Tracking dialog, ensure the constellations covered in Starpoint™ subscription are selected.
In RTK survey configuration:
- In the Rover Receiver dialog, click
and select Receiver Setting from the dialog menu.
- In the open Receiver Setting dialog, check the Enable Skybridge™ box. To receive PPP corrections data, RTK survey configuration supports LBand satellite down link only.
- If required, click the Advanced button to open the Skybridge™ dialog and select a specific LBand satellite manually.
- In the Solution fields of Topo Survey / Auto Topo Survey / Stake Settings dialogs, select Fixed, PPPF and PPPN as desired solution type. More about solution types.
- In the Tracking dialog, ensure the constellations covered in Starpoint™ subscription are selected.
Starting and managing survey with PPP enabled
Connect MAGNET Field to the rover receiver using a survey configuration with enabled PPP.
Note: If "Connected receiver does not support Starpoint™" warning is displayed after MAGNET Field established connection to the GNSS receiver, ensure:
• the actual connected GNSS receiver matches to the model configured in MAGNET Field;
• the Option Authorization File (OAF)
is valid.
To control the current PPP status:
- Check your Starpoint™ subscription in the System tab of the Status dialog (to open, click
>
>
):
- Starpoint™ Subscription - the field can display the following values:
- N/A - the subscription is absent or the date of the subscription is expired;
- Not Ready - the current subscription is not ready. The subscription expiration date also displays.
- Ready - the current subscription properly works. The subscription expiration date also displays.
- If you are using Network to receive PPP corrections data via NTRIP broadcast over the Internet, check your current connection status in the Network tab of the Connection dialog (to open, click
>
):
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Internet Connection;
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Mount Points Request;
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NTRIP Caster Connection.
- If you are using LBand to receive PPP corrections data via LBand satellite down link, check the current LBand status in the System tab of the Status dialog (to open, click
>
>
):
- LBand Link - quality of the LBand link;
- LBand Satellite - name of the current satellite;
- LBand Signal Quality - received power level, in dB;
- LBand SNR - current signal to noise ration, in dB*Hz.
If required, you can change connected LBand satellite manually from the Receiver settings dialog in survey configuration wizard by clicking the Advanced button next to the drop down list with enabled LBand.
- If you are using RTK or Network RTK survey configuration, check the current Skybridge™ status in the System tab of the Status dialog (to open, click
>
>
):
- Skybridge™ Status - the field can display the following values:
- Unknown - unknown status;
- Rover Not Ready - the rover receiver is not ready to work in the Skybridge™ mode: please check the receiver options, Starpoint™ subscription and satellite tracking;
- No Base Data - the rover receiver does not obtain the correction data from Network or RTK base station (no RTK solution); the rover is not ready to work in the Skybridge™ mode;
- Base Estimation - the rover receiver performs estimation of Network or RTK base station precise position in ITRF 2014 coordinate system; the rover is not ready to work in the Skybridge™ mode;
- Ready - the rover receiver is ready to work in the Skybridge™ mode.
- Monitor the current PPP solution right in status panel of Topo, Auto Topo, and Stake dialogs during survey:
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- PPP engine supplies the current solution, the receiver obtains PPP corrections data. (Available for GNSS survey configurations with activated Skybridge™ or Starpoint™ in the Receiver Settings dialog). More about solution types.
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- current solution is Convergence PPP stage;
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- current solution is PPP Normal;
-
- current solution is PPP Full.
To start Automomous / SBAS survey (Starpoint™ enabled):
The GNSS receiver starts to obtain PPP corrections data after MAGNET Field with PPP enabled Automomous / SBAS survey configuration is connected to the receiver and the receiver is connected to the source of PPP corrections: LBand satellite down link or NTRIP broadcast over the Internet.
The initial PPP solution at the start of survey is Convergence PPP (CPPP). More about solution types. This stage may take about 10-30 minutes. After the convergence stage is over, PPP Normal (PPPN) solution is obtained meaning the RMS came down enough. PPP Full (PPPF) solution becomes available if LBand is used to obtain PPP corrections data and after the RMS comes down further.
Note: Obtained PPP solution remains usable for up to 8 minutes after connection to LBand or NTRIP broadcast is lost.
To start RTK or Network RTK survey (Skybridge™ enabled):
The main RTK engine and the backup PPP engine work simultaneously in RTK / Network RTK survey. GNSS rover receiver starts to obtain both RTK and PPP corrections data after MAGNET Field is connected to the rover receiver, base to rover connection is established and the rover receiver is connected to the source of PPP corrections: LBand satellite down link or NTRIP connection over the Internet.
The survey starts with obtained RTK solution. More about solution types. The PPP engine works in background and Skybridge™ initiates Base Estimation routine. Check the current Skybridge™ status in the System tab of the Status dialog (click
>
>
). Base Estimation stage may take about 20-35 minutes. After Base Estimation is done, the Skybridge™ status switches to Ready and the PPP engine is ready to supply the solution.
Note: Usually, Skybridge™ performs Base Estimation routine only once for the same base in survey. You may exit MAGNET Field, create new jobs from a job where Base Estimation has been performed, turn off the rover receiver, even make pause for a night. Skybridge™ will be ready to virtually instantly supply the PPP solution upon reconnection.
When the rover receiver is obtaining RTK corrections data from the base, only the RTK engine supplies the current solution. If the rover receiver stops obtaining corrections from the base and RTK solution is lost, Skybridge™ smoothly switches to the current PPP solution.
At this moment, you may see a period of PPP Normal (PPPN) solution allowing user to save measurements to the job's database and continue surveying. PPP Full (PPPF) solution becomes available if LBand is used to obtain PPP corrections data and after the RMS comes down further. When the reception of RTK corrections data is restored and RTK Fixed solution is obtained, Skybridge™ smoothly switches from PPP to RTK engine and only the RTK engine continues to supply the current solution.
Note: In situation the Skybridge™ status is Base Estimation (base estimation routine is in progress) and the rover receiver stops obtaining corrections from the Network / RTK base (RTK solution is lost) the PPP engine displays the CPPP stage.
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