OxTS Survey+ family

Survey+ GNSS-aided inertial measurement systems

Survey+ inertial navigation systems from Oxford Technical Solutions combine the best of GNSS positioning technology with high-grade gyros and accelerometers to deliver superior performance in a single enclosure.

To obtain high-precision measurements, the Survey+ uses mathematical algorithms developed for use in fighter aircraft navigation systems. An inertial sensor block with three accelerometers and three gyros (angular rate sensors) is used to compute all the outputs. A WGS 84 modelled strapdown navigator algorithm compensates for earth curvature, rotation and Coriolis accelerations, while measurements from high-grade kinematic GNSS receivers update the position and velocity navigated by the inertial sensors.

This innovative approach gives the Survey+ several distinct advantages over systems that only use GNSS:

  • The Survey+ has a high (100 Hz 200 Hz or 250 Hz) update rate and a wide bandwidth.

  • The outputs are available with low, 3.5 ms latency.

  • All outputs remain available continuously during GNSS blackouts when, for example, the vehicle drives under a bridge.

  • The Survey+ recognises jumps in GNSS position and ignores them.

  • The position and velocity measurements the GNSS makes are smoothed to reduce the high-frequency noise.

  • The Survey+ makes many measurements GNSS cannot, for example acceleration, angular rate, heading, pitch and roll.

There is minimal configuration required to use the system. The configuration can be saved to the Survey+ so it can operate autonomously without user intervention. A lot of work has been put into the initialisation of the inertial algorithms so the Survey+ can reliably start to navigate in the vast majority of situations. The single unit contains inertial sensors, GNSS receiver, data storage and CPU. One or two antennas need to be mounted outside the vehicle where they have a clear view of the sky. A 10–50 V dc power supply can be obtained from most vehicles. A laptop computer allows real-time viewing of the results.

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