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Typical Applications

This chapter introduces typical applications of Oscar Trek GNSS receiver, and solutions for some possible issues.

 Install the radio antenna before switching the radio transceiver to transmit mode, or the radio transceiver may be damaged due to overheating. The energy to be transmitted cannot be emitted out without the antenna, which may cause the temperature rise and overheat of the radio module.

Rover operation​

Figure 4.1 Oscar Trek as a Rover - Network Mode

Table 4.1 Devices of Oscar Trek as a rover network mode

NO. Device Name

1 Oscar Trek GNSS receiver

2 Ranging pole

3 Bracket for TC80

4 TC80 Controller

Figure 4.2 Oscar Trek as a Rover - Internal Radio

Table 4.2 Devices of Oscar Trek as a rover internal radio mode

NO. Device Name

1 Oscar Trek GNSS receiver

2 410-470MHz radio whip antenna

3 Bracket for TC80

4 Ranging pole

5 TC80 Controller

Detailed steps of button operation:

  1. Set up Oscar Trek according section 2.1 Setting up Oscar Trek after all the components above are ready, ensure one battery and one SIM card are installed in Oscar Trek;

  2. Long press the power button to power on Oscar Trek;

  3. Press FN button to select [Mode Config], press the power button to enter the work mode options;

  4. Select [Rover Mode] and press power button;

  5. If using Tersus Caster Service, select [TCS] and press the power button to enter TCS network settings; Set the Base ID, server and press the power button to confirm.

  6. If using internal radio, select [Internal Radio] and press the power button to enter radio setting; Set protocol, channel and frequency same as Base, press the power button to confirm.

  7. If using NTRIP Client, select [NTRIP Client] and press the power button to enter NTRIP setting; set IP address with correct port and press the power button to confirm.

  8. Above all, setting Oscar Trek as a rover is completed.

Detailed steps of software operation:

  1. Set up Oscar Trek according section 2.1 Setting up Oscar Trek after all the components above are ready, ensure one battery and one SIM card are installed in Oscar Trek;

  2. Long press the power button to power on Oscar Trek;

  3. Use NFC function to launch Nuwa app. While the screen of TC40/TC80 Controller is unlocked, put TC40/TC80 Controller close to the Oscar Trek NFC logo. The WiFi connects automatically after a beep and Nuwa is launched requesting to open the latest project. Click [OK] and start configuring Oscar Trek from step 7. Also you can click [Cancel] to create a new project or open an existing project, and then start configuring Oscar Trek from step 7.

  4. If using an android device without NFC function, ensure Oscar Trek is powered on, and launch Nuwa application on the android device. Click [Project] in the main interface to create a new project or open an existing project and connect Oscar Trek manually.

  5. Back to the main interface of Nuwa app, click [Device] -> [Connect] under an opened project;

  6. Select [Oscar Trek] for the Device Type, select [WiFi] for the Connect Type, click [Connect Config] to search and connect to Oscar Trek's WiFi, select [Oscar] for the Antenna and click [Connect] to enable communication between the android controller and Oscar Trek.

  7. Back to [Device] - > [Rover], click [New] to create a new configuration for base.

Figure 4.3 Rover setting interface

  1. Edit rover configuration for Oscar Trek GNSS receiver under different data link selections. The Receiver Network and PDA Network have three protocol options respectively: Ntrip, TCP and Tersus Caster Service (TCS).

Figure 4.4 Rover configuration - Internal Radio

Figure 4.5 Rover configuration - Receiver Network (TCS)

Figure 4.6 Rover configuration - Receiver Network (Ntrip)

Figure 4.7 Rover configuration - PDA Network (Ntrip)

Note: Select PDANetwork when using cellular network of a PDA such as TC80 Controller.

  1. After filling the information for the above configuration, click [OK]. Select this configuration in the work mode list and click [Start] to start data transmission for rover which is shown as below.

Figure 4.8 Link status of Rover using internal radio

Static survey​

Before performing static survey, ensure one battery is installed in Oscar Trek GNSS receiver.

Detailed steps of button operation:

  1. Long press the power button to power on Oscar Trek;

  2. Press FN button to select [Mode Config], press the power button to enter the work mode options;

  3. Select [Static: OFF] and press the power button to enter configuration options for static survey;

  4. Set Frequency, Mask Elevation, Duration, Antenna Height, Measure Type, Data Format and RINEX Format;

  5. Turn on static when the cursor is on 'STATIC: OFF', then it becomes 'STATIC: ON', press the power button to confirm;

  6. Above all, setting static survey is completed.

Detailed steps of software operation:

  1. Long press the power button to power on Oscar Trek;

  2. Use NFC function to launch Nuwa app. While the screen of Controller is unlocked, put Controller close to the Oscar Trek NFC logo. The WiFi connects automatically after a beep and Nuwa is launched requesting to open the latest project. Click [OK] and start configuring Oscar Trek from step 6. Also you can click [Cancel] to create a new project or open an existing project, and then start configuring Oscar Trek from step 6.

  3. If using an android device without NFC function, ensure Oscar Trek is powered on, and launch Nuwa application on the android device. Click [Project] in the main interface to create a new project or open an existing project and connect Oscar Trek manually.

  4. Back to the main interface of Nuwa app, click [Device] -> [Connect] under an opened project;

  5. Select [Oscar Trek] for the Device Type, select [WiFi] for the Connect Type, click [Connect Config] to search and connect to Oscar Trek's WiFi, select [Oscar] for the Antenna and click [Connect] to enable communication between the android controller and Oscar Trek.

  6. Click [Survey] -> [Static Survey], fill in the parameters of interval, cutoff angle, and etc. Then click [Start] to start static survey.

Figure 4.9 Static Survey configuration

  1. If the DataAutoSave function is turned on, the static data is recorded automatically in the internal storage when power up Oscar Trek next time. You can download data file refer to section 2.3.

Tilt survey and stakeout​

Tilt function is only applicable for Oscar Trek GNSS receiver Ultimate version under rover mode.

4.3.1 Tilt initialization​

The tilt compensation of Oscar Trek GNSS receiver is free of complex calibration. The tilt compensation will be initialized when the surveyor walks forward naturally for several meters after turning on the tilt compensation function. You can start tilt survey right after you walk to the survey point.

There are two methods to turn on or off tilt compensation. One is turning on or off tilt compensation on Device Info on the OLED via buttons. Another method is through Nuwa app. After the Oscar Trek GNSS receiver is connect in Nuwa app, and we configure it working as a Rover. Click the device icon on the top or click [Device] under the device functional group to enter the device information interface. Turn on the [Tilt Enable] on the device interface.

When tilt function is turned on, the tilt LED on the Oscar Trek OLED display lights on with steady red, a few seconds later it starts flashing red. At this time, walk a few steps ahead, tilt the pole at any direction, then the tilt LED turns steady green which indicates tilt compensation is valid. Now you can start tilt survey.

When the tilt compensation is valid, click the Satellite info icon to view the detailed information of tilt compensation including tilt status, tilt direction, tilt angle, heading and their quality index. Among them, the tilt direct indicates which direction is tilted, that is, the angle between the projection of the ranging pole on the ground and the north direction after tilting; the tilt angle indicates the degree of tilt, that is, the angle between the tilted pole and the vertical direction; Heading indicates the surveyor's orientation (the facing of Oscar Trek's back, we consider Oscar Trek's panel is always facing the surveyor).

Figure 4.10 Detailed information of tilt compensation

4.3.2 Tilt survey​

After turning on [Tilt Enable] and tilt initialization is finished, enter Survey interface and start tilt survey.

The tilt status is displayed at the top of the survey interface. When the tilt status is ON, it is considered that the tilt compensation accuracy is high and it is in a usable state. You can start survey using the tilted ranging pole. Please ensure that the antenna height setting is correct which will affect the tilt measurement results.

Figure 4.11 Tilt status is ON

When the status is displayed as N/A and blinking, it is considered that the accuracy of tilt compensation is reduced and it is in a state that is not recommended. At this time, the tilt indicator of the Oscar Trek OLED display turns flashing red. This may be caused by the surveyor standing for too long, rotating the ranging pole, or hitting the ranging pole to the ground. When the status is N/A, you need to redo the initialization. Generally, you do not need to stand still, just hold the ranging pole and walk forward to the next point, the initialization is complete automatically.

Note: during the tilt survey, please keep the Oscar Trek OLED display facing the surveyor as much as possible. Please do not rotate the pole or hit the pole to the ground, which will invalidate the initialization or affect the accuracy of the tilt compensation. In addition, during the tilt point survey, if it does not continue at the third epoch reached when it is set smoothing 5 epochs for surveying points, please check whether the tilt compensation is invalid. It is not allowed to continue to complete the survey in the case where the tilt initialization accuracy is low.

4.3.3 Tilt stakeout​

After turning on [Tilt Enable] and tilt initialization is finished, enter the Point Stakeout or Line Stakeout interface and start tilt stakeout. The tilt state is also added at the top of the stakeout interface to indicate the current tilt available state.

During the tilt stakeout process, if you enter the threshold range of the stakeout setting, the software will display a virtual tilt ranging pole along with the beep sounds. It is drawn according to the tilt direction angle. When the pole is tilted in a certain direction among east, west, south and north, the virtual tilt ranging pole on the interface will also tilt in a certain direction.

Figure 4.12 Point stakeout when tilt compensation is on

Issues and solutions​

This section lists possible issues and effective solutions to solve them. Please read this section before contacting Tersus technical support.

  1. Trek GNSS receiver cannot receive satellite signals.

Solution:

(1) Change the survey environment, and restart Trek in an open space.

(2) Reset the GNSS module by Reset button in Device interface.

1.  The communication between Nuwa and Trek fails.

Solution:

(1) Check whether the Trek is powered on;

(2) Re-search and connect the WiFi;

(3) Upgrade Nuwa to the latest version.

1.  There is no correction data for rover when using receiver network Ntrip work mode.

Solutions:

(1) Check whether the IP address, port, user name, password is correct.

(2) Try to connect to CORS via controller network and receive correction data to ensure there is no issue on CORS service, then switch back to receiver network mode.

(3) Check whether the 4G SIM card is properly installed, and whether it can be used normally.

(4) Go to [Device] - [Cellular], check the registration status of the network. Try entering APN name and restarting cellular module.

(5) Try to log in with the same configuration and get a compared result if there is an extra receiver.

1.  How to export static observation data from Trek?

Solutions:

(1) Connect Trek receiver with a computer through a USB Type-C cable.

(2) The computer detects the Trek receiver as an external disk.

(3) Open the \Data\record folder, find the trs file and rinex file in its storage according to recording date.

(4) Copy the static observation data and paste them to the designated folder in your computer.

1.  How to apply Geoid model file correctly?

Solutions:

(1) Prepare the Geoid file at first and placed in the path of Internal storage\TersusSurvey\Geoid.

(2) Next step, launch Nuwa and go to select Project - Current Project and edit Coordinate System. Find the Height Fitting - Geoid and select Geoid, or directly download Geoid files from Tersus server after clicking More.

1.  How to configure Trek serial port output NMEA log?

    **Solutions**:

    Nuwa can configure to output NMEA by the NMEA option. It can be specified the Baud Rate, the kind of sentence.

2.  A base receiver is working well, the rover receiver cannot get correction data via UHF, how to fix this?

Solutions:

(1) Check whether the radio antenna connects well with receiver. Carefully check whether the interface is tightened.

(2) Check whether the air baud rate, Protocol, Bandwidth, Frequency match right with that of the base receiver.

(3) Switchover the radio frequency to avoid the possible interference from nearby devices.

(4) Get a compared result when an extra receiver is configured as rover with the same settings.

1.  The Trek rover works at a short distance (not normal distance) at the radio mode?

Solutions:

(1) Check whether the rover connects a radio antenna.

(2) Adjust the radio of base at the high power gear.

(3) Check the environment if there exists radio interference along the propagation line.