Barometry – measuring changes in air pressure – is a relatively old technique, and might sound somewhat outdated. But digital barometers using silicon sensors provide accurate and stable barometric measurements and have found a role in a number of applications, including altimetry. Using barometers aided (calibrated) by real-time kinematic (RTK) GNSS where signal reception is good can provide elevations meeting the accuracy requirements for a range of applications.
Seisland developed an integrated system which uses compensated pressure and temperature data from a silicon digital barometer (Vaisala, Honeywell) with RTK GNSS receiver data. Augmentation with a base barometer further improves reliability. By following the standard operating procedures, we meet sub-metre accuracy at 95 percent probability. Seisland has made continuous upgrades to this system, most recently enabling Bluetooth functionality.