Yes! Tersus PPK solution is platform independent, which does not just mean that it can go from your fixed wing UAV to your Multi-rotor but also means that it operates independently of your flight controller. In fact, there is no connection between the Tersus system and your flight controller, unless you are using your flight controller to trigger event mark in Tersus system or use Tersus system for navigation purpose. So whether you are using an APM, Pixhawk, NAZA, WOOKONG, MICROPILOT, Mikrokopter, Microdrone, or any other flight controller, Tersus PPK solution will still work!

Oscar combines IMU data and GNSS RTK results to real-time calculate the three-dimensional attitude of Oscar, thereby deduce Oscar's tilt angle. 

The Tersus David is a cost-efficient, palm-sized GNSS receiver designed for surveying UAVs, AGVs, and agricultural applications. Working with an external GNSS antenna, the free Tersus Survey App and post-processing software, the David GNSS receiver is a low-cost solution for all survey applications, including real-time RTK positioning and data collection for PPK.

For details, please visit: https://www.tersus-gnss.com/product/david-receiver

We have AG960 hydraulic drive autosteer system, AG961 motor drive autosteer system, AG963 base station kit for AG960/AG961 autosteer systems, AG980 hydraulic drive autosteer system, AG982 GNSS guidance system and AG983 base station kit for AG980/AG982 autosteer systems.

Using an external antenna together with the free Tersus Survey App and post-processing software, the David GNSS receiver provides a low-cost solution for all survey applications, including real-time RTK positioning and data collection for PPK.

There are 7 different kits for Tersus David.

●David GNSS Receiver Rover Kit Mobile Mode

●David GNSS Receiver Rover Kit with 1W Radio Station

●David GNSS Receiver Rover Kit with 2W Radio Station

●David GNSS Receiver Base Kit Mobile Mode

●David GNSS Receiver Base Kit with 1W Radio Station

●David GNSS Receiver Base Kit with 2W Radio Station

●David GNSS Receiver Base Kit with 35W Radio Station

The AG960 hydraulic drive autosteer system is developed on Android platform. We have developed by C or C++ programs. You can use USB to change or update the program of panel computer (monitor). There is an interface of USB on the back of the panel computer (monitor). There is a reserved joint on the wire to use change or update the program of navigation driving box and differential reference station (you maybe use CORS or SBAS).

Tersus David GNSS receiver is currently only compatible with Android smart devices.

The AG960 hydraulic drive autosteer system can be installed in corn combine harvester (hydraulic steering system). The hydraulic steering system of harvester is controlled by the valve of the AG960. 

Tersus David GNSS receiver can be seamless integrated with any Android smartphones. The Tersus Survey App is available for free.

The panel computer can be operating by touchscreen. It can be used for system set-up, equipment calibration, working information illustration and so on. There is a full processor in autopilot (controller).

Generally speaking, there are several main classes of applications that can be used with Tersus David GNSS receivers to attain high-precision positioning details.

●Rover + CORS 

●Base + Rover + Radio

●Base + Rover + Tersus NTRIP Caster

●Raw Measurements Collection

The satellite positioning signal is received by the antenna that installed on the top of the driving cap of the vehicle and differential reference station. The GNSS antenna is connected to the "GNSS antenna" port of the front panel of autopilot (controller) through a 3m RF cable. The radio receiving antenna is connected to the "radio antenna" port of the front panel of autopilot (controller) through a 3m RF cable.

Each end of the data harness (white end harness, you can find it in the user manual) is respectively connected to the autopilot (controller) and the panel computer.

One end of the drive harness (black end harness, you can find it in the user manual) is connected to the autopilot (controller). The other end is divided into three lines each of which is respectively connected to vehicle battery, electromagnetic hydraulic valve and steering measuring mechanism.

Yes. The NeoRTK supports 3G, including TD-SCDMA, WCDMA, EDGE, GPRS and GSM. 

The Tersus-Survey is RTK survey software for NeoRTK. It is capable of configuring base and rover stations, setting up stake points, stake line, detail survey, intersection, mapping survey and handling calculation and conversion for distance, angle and area with COGO. 

The T17M is a GNSS controller, which can work together with NeoRTK GNSS receiver. It is equipped with MicroSurvey-FieldGenius software.

Tersus Geomatics Office is integrated office software to manage and process data for NeoRTK. It is laid out with visualized toolbars and logical icons to easily handle GNSS data processing, baseline processing and network adjustment. It is the software to import, transfer and analyze data. 

The Tersus GNSS OEM boards support RTCM 2.x/3.x/CMR/CMR+. Other communicated differential messages include correction message, correction data and differential data.

T17M works with Windows Mobile operating system.

In open sky environment, the initialization time for different first fixed solutions is listed as below.

●Cold start：

        - Single point positioning <40 seconds

        - RTK positioning<10 seconds

●Warm start：

        - Single point positioning <20 seconds

        - RTK positioning<10 seconds

There is no extra configuration necessary for receiving different RTCM messages. The Tersus BX GNSS OEM boards can automatically recognize RTCM2.X or 3.X. There is no significant difference between the versions.

CORS is for Continuously Operating Reference Stations. Tersus offers MatrixRTK, a GNSS RTK system for CORS station. With centimeter-accurate RTK board inside, MatrixRTK provides accurate and stable signal reception. Working with choke ring antenna, it can improve the capability of anti-jamming and output high-qualify RTK correction, which is ideal for establishing CORS system and monitoring system.

In theory, there are two inputs to a rover, the satellites signals from the antenna and corrections from the base. So if the rover can’t get fixed solution, please check the following:

●Does the antenna have good view of sky and is the communications connectivity reliable?

●Is the power to the antenna is OK?

●Have the RTK corrections from the base been transmitted successfully?

●The corrections datalink is OK.

●The baud rate and the receive type of the rover’s port are correct.

The possible reasons are:

●The receiver’s baud rate is not the same as the computer’s port.

●The USB adapter driver has not installed correctly.

●The GND signal of the adapter is not reliably connected to the GND of the receiver.

●The driver for the USB adapter is not installed successfully.

●The receiver’s baud rate is not the same as the computer's port.

●The receiver port’s Tx/Rx type is not correct.

●The cable connection is not reliable.

The BX receiver has a serial port, so in theory, any serial tool can be used to communicate with it, for example, Hyper-terminal, UarTerm or SSCOM32. It is recommended that the Tersus GNSS Centre, a graphic serial tool, is used to communicate with BX receivers. 

The Tersus RINEX Converter supports raw measurement data and RTCM data. This data can be converted to RINEX 2.10 or RINEX 3.02 by using the Tersus RINEX Converter.

The BT120 Bluetooth module cannot pair with an iPhone. It can only pair with Android smart phones.

●The Bluetooth module is not powered correctly. It may be necessary to power cycle the BX receiver.

●The Bluetooth in a smartphone can’t be paired successfully with the Bluetooth module. The module can only communicate with an Android system.

●The baud rate of the Bluetooth is 115200, so ensure the receiver’s serial port has also been configured to 115200 baud rate.

Tersus offers four kinds of radio modules.

It may be caused by following reasons:

●A fixed coordinate must be defined for the BX receiver before the RTCM output can be sent. Therefore, use the Fix Position command (see Tersus GNSS Command & Log Reference document) to fix the coordinate first.

●Check the Interfacemode. If the target serial port is not in right mode, it may not output RTCM properly. Use the Interfacemode command (see Tersus GNSS Log & Command Reference document) to set the serial mode.

It can be caused by following reasons:

●Check the power supply. The BX306 board power consumption is about 3W. Note that although a Pixhawk controller can supply power, its output power capability is far less than 3W, in which case the BX306 must be powered by an external power source. A voltage convertor is recommended to convert 12V battery power output 5V for connection to a BX306 board.

●Please check the baud rate settings within the Mission Planner. It cannot be recognized if incorrect baud rate is used. By default, the baud rate of BX306 COM1 port is 115200 bps.

●Please check the NMEA output. The Mission Planner requires GPS sensors outputs, i.e., NMEA GGA sentence, RMC sentence and VTG sentence, at 5Hz. Missing VTG sentences or low update rates may cause recognition failures.

●Check the NMEA talker. Note that the Pixhawk can only recognize the NMEA sentence with GP NMEA talker. Incorrect NMEA talker may cause failure.

The Tersus GNSS Center is configuration tool for Tersus GNSS products. This software integrates configuration, monitoring, data logging, firmware upgrade and other useful tools. With Tersus GNSS Center, you can communicate over the on-board serial ports, key in commands to configure the board, upgrade firmware, store data, playback data, convert data to RINEX format, display rover’s trajectory in Google/Baidu map, calculate the average position of the base station, view status of the board and positioning results.

For details, please visit: https://www.tersus-gnss.com/product/tersus_gnss_center

Tersus GeoPix integrates the functions of GNSS observation post processing, Event Mark interpolation and Geotagging in EXIF. By clicking one button after input all necessary data, the software provides the result directly as input for image processing software. Tersus GeoPix is a part of Tersus Tool Suite which can be downloaded from Tersus official website.

For details, please visit: https://www.tersus-gnss.com/software

Tersus UAV PPK solution includes BX306 PPK Receiver, AX3705 Helix Antenna (or AX3703 GNSS Aviation Antenna as another option) and Tersus GeoPix Software. BX306 PPK Receiver supports multi-constellations and dual-frequencies. It has in-built 4GB memory (eMMC) for GNSS observation data recoding. Very small and light AX3705 Helix Antenna and AX3703 GNSS Aviation Antenna are designed for UAV applications.

For details, please visit: https://www.tersus-gnss.com/product/uav-ppk-solution

The Tersus PNW software is a high accurate CORS Network management and positioning service software with optimized algorithms independently developed by Tersus GNSS Inc. The software can effectively model errors caused by ionosphere, troposphere and satellite orbit, and precisely estimate correction at the rover. It enables the rovers to achieve fast real-time positioning with centimeter accuracy. The stability and reliability of Tersus PNW software has been approved by maintaining large-scale CORS network.

For details, please visit: https://www.tersus-gnss.com/product/pnw-software

CORS is for Continuously Operating Reference Stations. Tersus offers GeoBee, a GNSS RTK system for CORS station. With centimeter-accurate RTK board inside, GeoBee provides accurate and stable signal reception. Working with choke ring antenna, it can improve the capability of anti-jamming and output high-qualify RTK correction, which is ideal for establishing CORS system and monitoring system.

The Tersus GeoCaster is a Networked Transport of RTCM via Internet Protocol (NTRIP) Caster software which allows GNSS correction data such as RTCM corrections to be repeated and sent to different end users via internet. It supports configurable bases online simultaneously and configurable rovers for one base. The end users involve in various areas including surveying, construction engineering, deformation monitoring, automated vehicle, precision agriculture, Unmanned Aerial Vehicle, machine control, robotics, etc.

For details, please visit: https://www.tersus-gnss.com/product/geocaster

The Tersus GeoBee is a dedicated and cost-effective solution to transmit or receive Ntrip corrections. With Tersus Ntrip Caster Service, Ntrip Modem and David Receiver, the GeoBee opens the possibility for users to transmit Real Time Kinematic (RTK) corrections via Internet (Ethernet or 2G/3G/4G) in a simple, user-friendly way, just using a SIM card or Ethernet cable without any need of a static IP. GeoBee can also work as GNSS Rover to receive RTK corrections from Tersus Ntrip Caster or any CORS service.

For details, please visit: https://www.tersus-gnss.com/product/geobee

The Tersus TC50 Controller is a rugged multi-functional data controller with design of 5'' HD touch screen and an alphanumerical keypad. Equipped with powerful Octa-core processor and android operating system, it is perfect to adapt with Tersus survey software. With professional IP68 rating, it is robust and reliable for harsh operating conditions. 

For details, please visit: https://www.tersus-gnss.com/product/tc50-controller

The Tersus TC40 Controller is a rugged smart phone with design of 8'' IPS screen and 1280*800 resolution. Equipped with Android 8.1 mainstream operating system, 8-core 2.0G processor, it is perfect to adapt with Tersus Survey software and run fast. The 9000mAh large capacity battery is detachable, which can work continuously for 10 hours without pressure. The unique rounded corner design and plastic shell are compatible with appearance and protection. With professional IP67 rating, it is robust and reliable for harsh operating conditions.

The Tersus TC30 Controller is a rugged controller with the design of 5'' touch screen and full keypad. Flexible interfaces such as Bluetooth, Wi-Fi, 3G/4G and DB9 serial port make it convenient to connect to GNSS receivers and transceive correction data. Equipped with Windows Mobile operating system, it is perfect to adapt with MicroSurvey FieldGenius software and other field application software. With professional IP67-rated protection, it is robust and reliable for harsh environment. 

For details, please visit: https://www.tersus-gnss.com/product/tc30-controller

The Tersus TC20 Controller is a rugged smart phone with design of 4.3'' touch screen and an alphanumerical keypad. Equipped with powerful processor, it is perfect to adapt with Tersus Survey software. With professional IP68 rating, it is robust and reliable for harsh conditions.

For details, please visit: https://www.tersus-gnss.com/product/tc20-controller

The T18M is a GNSS controller equipped with an alphanumerical keypad, a 3.7" sunlight readable screen and a powerful processor, which is designed to improve surveyors' productivity.
With a rugged IP54-rated enclosure that can survive 1.2 meter free drops, the T18M is a perfect solution for the harshest operating environments. In addition, the Li-ion, 6500mAh-capacity battery can support prolonged fieldwork.

For details, please visit: https://www.tersus-gnss.com/product/t18m-controller

Nuwa is a survey application software based on Android OS (Operating System), designed by and all rights reserved to Tersus GNSS Inc. Nuwa is simple, easy to use and has a friendly user interface. It is designed to work with David GNSS receiver, Oscar GNSS Receiver and other receivers which support NMEA-0183.

- Supports Bluetooth and USB connection

- Configure Base, Rover and Static Survey

- Graphical Interface with background map (online/import)

- CAD Stakeout, Road Stakeout and Earthwork

- Data Management (import/export multiple formats)

- Various built-in tools

For details, please visit: https://www.tersus-gnss.com/product/nuwa

Generally speaking, there are several main classes of applications that can be used with Tersus David GNSS receivers to attain high-precision positioning details.

- Rover + CORS 

- Base + Rover + Radio

- Base + Rover + Tersus NTRIP Caster

- Raw Measurements Collection

Tersus Oscar GNSS receiver is a new generation of tilt compensation GNSS receiver. Empowered by a high precision inertial measurement unit (IMU) on Ultimate version, this kind of calibration-free tilt compensation is immune to magnetic disturbances. Oscar gives a surveyor unprecedented flexibility and efficiency - holding the survey pole upright is no longer necessary. With an internal high-performance multi-constellation and multi-frequency GNSS board, Oscar GNSS Receiver provides high accuracy and stable signal detection.

The built-in high-performance antenna can speed up the time to first fix (TTFF) and improve anti-jamming performance. With a Nano-SIM card inserted in Oscar, it can access Internet, transmit and receive correction data through 4G/WiFi network. The built-in UHF radio module supports long distance communication. The built-in large capacity battery is detachable and can display power level. Two batteries support up to 16 hours of fieldwork in 4G/3G/2G network and Rover radio mode. Oscar can be easily configured with 1.54'' interactive screen on Ultimate and Advanced versions. The rugged housing protects the equipment from harsh environments.

For details, please visit: https://www.tersus-gnss.com/product/oscar_gnss_receiver

The Tersus BX40C is a compact GNSS RTK board with full constellation tracking for providing cm-level accuracy for positioning. In-built 8GB memory makes data collection easy. It features compatibility with other GNSS boards in the market via flexible interfaces, smart hardware design, and commonly used log/command formats.

For details, please visit: https://www.tersus-gnss.com/product/bx40c