Case Study: Dual Antenna GNSS/INS for Road Surveying

ARRB Survey Truck

Advanced Navigation’s Spatial Dual enables ARRB SYSTEMS to strengthen its survey offering.


ARRB Hawkeye Survey Solution

At the core of ARRB Systems offering is the Hawkeye Survey Solution, one of the most complete and advanced data collection systems in the industry today. The modular solution enables complete scalability and customized functionality whilst still delivering consistent and integrated data outputs. This data allows ARRB Systems clients to better understand the structural and functional conditions of pavement and establish optimal maintenance strategies.

GIPSI-TRAC2 Dead- Reckoning System

ARRB Systems Gipsi-Trac2 forms part of the Hawkeye Survey Solution and is crucial to its accurate and effective collection of road condition data. The System gives ARRB Systems equipment high levels of control over the sampling and interpretation of the outputs for full synchronization and integration of spatial data into other comprehensive data sets, such as roughness and pavement strength. It also provides road geometry and positional data that can be used for complex 3D highway mapping, location of potential sites for hazardous road surface rainfall ponding, and can be used to estimate curve advisory speeds and highway travel times.


The Hawkeye systems incorporate a unique Heartbeat Module which provides high accuracy time stamping to lock all data parameters together. All data streams and reference measurements are aligned through the high precision Heartbeat. This enables the system to synchronize the output data to a specific road location at the desired reference intervals.

Talking about the gap in their technology, Michael Henson, Hardware Design Engineer at ARRB Systems said, “Even with this very precise synchronization of the various data streams, positioning this data precisely in the real-world requires a very accurate positioning system”. The solution also had to be reliable and cost-effective to make sure the Hawkeye remained commercially viable.


Data Spatial Visualisation

Advanced Navigation provided an accurate spatial solution that could be seamlessly integrated into the Hawkeye system”, said Michael. Spatial Dual, a dual antenna GPS-aided Inertial Navigation System, was able to provide ARRB Systems with the precise time, reliable navigation and accurate orientation needed to deliver optimal project outcomes at maximum efficiency.

“As surveys are made along road networks, we have a particular interest in location, grade and cross-slope data. The Spatial Dual provides accurate fusion of its sensor data to fulfil these requirements” Michael Henson, Hardware Design Engineer. Michael also noted that whilst they had an existing INS which had been used extensively, they required improved dead-reckoning. Integrating Spatial Dual into the Gipsi-Trac2 dead-reckoning system, allowed ARRB to navigate consistently through challenging environments where GNSS signals are degraded or interrupted entirely, therefore bridging the gap with seamless and accurate navigation data.

Advanced Navigation was able to provide a high quality solution that could meet the required specifications at a competitive price. “The quality of the data and the value proposition compared with alternatives were key to the decision to go with Advanced Navigation” said Michael. While the product was core to the partnership, ARRB Systems was also impressed with Advanced Navigation’s ongoing technical support throughout the whole process. “There has been much communication between our teams, both during the initial development period and afterwards.”

About Spatial Dual

Spatial Dual

Spatial Dual is a ruggedized, GNSS aided Inertial Navigation System that provides accurate position, velocity, acceleration and orientation under the most demanding conditions. It combines temperature calibrated accelerometers, gyroscopes, magnetometers and a pressure sensor with a dual-antenna, RTK capable GNSS receiver. These are coupled in a sophisticated fusion algorithm to deliver accurate and reliable navigation and orientation.


  • 0.1 ° Roll and Pitch
  • 0.1 ° Heading
  • 8 mm RTK Positioning
  • 3 °/hr MEMS Gyroscope
  • 1000 Hz Update Rate
  • 2000 g Shock Limit

Key Features

  • Dual Antenna Heading
  • Multi-Constellation RTK
  • Hot Start Time: 500 ms