TAG: Kalman filter

Karel Introduces High-Performance GPS/INS System

March 9, 2015By
The VIA-100G GPS/IMU by Karel Electronics.

The VIA-100G, an integrated GPS and MEMS-IMU (inertial measurement system), has been added to the ViaNav inertial navigation system family produced by Karel Electronics Corporation. Featuring a high-accuracy fusion filter running on an embedded processor, the VIA-100G provides all the functions of a vertical reference unit (VRU), an attitude and heading reference system (AHRS) and integrated GPS/IMU system. The system contains GPS, 3D gyroscopes, 3D accelerometers,... read more

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OxTS Offers Core Module for Inertial, GNSS

January 30, 2015By
Oxford-Oxts-Core_hand

The xOEMcore, now being offered by Oxford Technical Solutions (OxTS), is an inertial navigation system that can also serve as a framework for other positioning systems. The xOEMcore is a combined six-axis inertial measurement unit and navigation system with sensor fusion in one compact OEM module. In its base form, the xOEMcore measures and outputs raw accelerations and angular rates... read more

Expert Advice: Loose Coupling — And What’s Wrong With It

January 2, 2015By

Concerns raised about cascaded Kalman filters for loose coupling and/or usage of input data “massaged” in unknown ways are not new, but are routinely excused by requirements to use coordinates from receivers not providing measurement outputs. Often, however, a receiver’s internal 8-state extended Kalman filter (EKF) is not fed with precise carrier phase data — and even when it is, its velocity outputs (being both filtered and unaided) have limited ability to follow high dynamics. Velocity pseudomeasurements under those conditions interfere with IMU aiding. read more

Innovation: Cycle Slips

January 1, 2014By
FIGURE 1. A cycle slip affecting phase measurements but not the pseudoranges.

Detection and Correction Using Inertial Aiding
A team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time. read more