G-NAV smart antenna

A compact GNSS antenna with embedded INS

A single G-NAV comes useful in land & marine surveying, robotics, UMV.

A network of smart antennas has applications in tracking, dynamic positioning, geo-fencing, berthing aid systems, offshore operations, motion monitoring.

Benefits

Compact

The necessary basic components needed to complete an accurate survey as well as for navigation, are embedded into a compact case which is light and robust.

Connected

Antennas and modems needed to communicate with base stations, and receivers are integrated out-of-the-box and easy to configure

Controllable

Real-Time monitoring and wireless control are possible by connecting any tablet or smartphone to the Wi-Fi access point provided inside the kit. Standard NMEA wireless interface allows data monitoring in real time.

Augmented GNSS

A seamless way of fusing GNSS navigation data with INS is of great help when surveying, especially when performing bathymetry surveys, mobile mapping, photographic surveys, etc

Real-Time

G-NAV was built considering the needs of a fleet where accuracy coupled with motion detection is key for real-time tracking.

Safe

A Nickel–Metal Hydride battery (NiMH) is safer during transport as compared to Lithium-Ion. The power supply can either be via battery or via Ethernet cable (PoE).

Characteristics

0.1°

Roll & Pitch

GNSS

By default, the GNSS receiver inside the smart antenna is set to work with GPS+Glonass constellations. It is also possible to extend to Beidou+Galileo.
Receivers are powered by Trimble technology which automatically provides 3 levels of accuracy.
RTK: 1cm-2cm. L-Band (RTX): 4cm -10 cm. SBAS 0.5m-1m.

Interface

NMEA protocol compliance

2 - 0.5Hz

TIME DIVISION UPDATE RATE

INS

Heading calculation is generally preferable to compute by a duo antenna system*, giving a precision of 0.02° over 10m baseline. Otherwise, the heading accuracy of the INS is 0.5° when connected to a single GNSS Antenna.
Roll or Pitch: 0.04° over 10m baseline (detected by dual GNSS Antenna*)
Roll & Pitch: 0.1° over 360 ° (detected with INS)
Speed accuracy: 1cm/sec fusing the INS+GNSS-RTK
Rate of turn: <0,1°/min
Heave accuracy: 5cm

(*) Duo Heading: Gyro aiding + 2nd GNSS Antenna (optional)

1-2cm

Position Accuracy

Autonomy

The rechargeable Nickel–Metal Hydride (NiMH) battery provides autonomy of up to 16 hours.
It is possible to connect a secondary external recharge battery to power up the main one.
The antenna can also be continuously powered via means of Power over Ethernet cable.

Radio Comms

All antennas, modems, and firmware to make the kit communicate with 3G mobile network and UHF (410-470 MHz and 868Mhz) are embedded.

Example of an application

Example of G-NAV used at the core of the GetYourSpace solution made for Bouygues Energies&Services. In this case, it provides a compact system where accurate geo-positioning is achieved via a high precision GNSS system which fuses GNSS navigation data with a INS (Inertial Navigation Sensor) embedded inside G-NAV.

Key Features

Inertial Navigation

An embedded MEMS-based IMU is embedded, this provides:

- Heading accuracy of the INS is 0.5° when connected to a single GNSS Antenna
- Roll & Pitch: 0.1° over 360 ° (detected with INS)
- Roll or Pitch: 0.04° over 10m baseline (detected by dual GNSS Antenna)
- Speed accuracy: 1cm/sec fusing the INS+GNSS-RTK
- Heave accuracy: 5cm

Hyper Connectivity

G-NAV guarantees to manage the most common telecommunication scenarios:

- GSM (default): to acquire RTK/RTX corrections
- UHF Tx/Rx UHF 868Mhz (License-free). To acquire RTK corrections and to communicate between G-NAV antennas (optional)
- UHF Tx/Rx UHF 430Mhz-:-470Mhz. To acquire RTK corrections and to communicate between G-NAV antennas over a wider distance range (optional)

Real-Time Tracking

When precise navigation and complex motion sensing takes place between several units spanning across an area of a few Km, a network of GEODs can easily be created out of the box:

- A proprietary TDMA transmission protocol relays navigation information from all slave GEOD to the base GEOD via UHF
- Relative distances and motions amongst beacons can be computed and shared

References

Bouygues

Energies & Services

Bouygues Energies & Services has developed an embedded solution, centered around GEOD technology, which identifies, collects and analyses the environment’s data and converts it into map format.
Using G-NAV to measure public lighting, pollution levels and urban sounds

FUGRO

PilotStar

Cadden developed for FUGRO a high precision portable berthing aid system, compliant with pilot requirements for docking. The system can help improve the safety and efficiency of complex marine operations
FUGRO

Port Revel

Shiphandling

Cadden equiped Port Revel facility with state of the art technology for real-time tracking, trajectography, GNSS RTK sensors, radio technology, cartography, RTK base station and PPU.
Port Revel
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