The basis of SPAN technology is its tightly coupled design, which provides exceptional performance and superior continuous performance when GNSS reception is limited. Tight coupling means that satellite data can still be used when GNSS positioning is invalid.
In addition, SPAN technology provides GNSS with faster signal reacquisition capabilities, with the result that more GNSS measurements are available to assist with inertial solutions. The advantage of this GNSS capture is to improve RTK performance by maintaining high-precision inertial navigation as the number of satellites decreases. The OEMV receiver itself handles all GNSS and inertial navigation data. The IMU is housed separately in a package and separated from the GNSS board to ensure a modular design. Current ProPak-V3 (RS-422) users can have their receivers process INS data performance by purchasing upgrade firmware.
Through the standard serial port, and then use a simple command and data logging interface, you can complete all settings and data collection. Once the installation of the hardware is complete, the system operation settings can be completed within minutes.
Unique advantages of the iIMAR-FSAS SPAN system The FSAS-EI-SN IMU is manufactured by the ilMAR company in Germany. The IMU employs a closed-loop technology with a gyro deviation of less than 0.75 degrees/hour and an accelerometer deviation of less than 1 mg. The IMU is triggered by the NovAtel receiver to ensure that all IMU measurements and GNSS measurements are synchronized. For commercial applications, the IMU can provide 2 months of ARO and must comply with German export regulations.
Working principle diagram: