How Does GNSS Testing Work?


GNSS/INS Simulation Systems are used to minimize errors in GPS readings by a thorough analysis of different factors that can affect a GPS system. A GPS/INS Simulation system takes these factors and applies appropriate alterations to the system. This provides the user more accurate results, all while remaining in the safety of a simulation.

How GNSS Simulation Works

In GNSS simulations, angular velocity is calculated by looking at changes in velocity and ‘specific force’ acting on a gyro. Angular Velocity provides the metrics needed to measure other factors like the altitude and position of the user.

CAST Navigation’s CAST-4000 continuously observes the acceleration and position of a vehicle, providing navigational data to the user without communicating with a base station. Using accelerometers and gyroscopes, the system follows a target vehicle’s position the position corresponding to a known starting point. With this, the system provides more accurate readings during GNSS simulations.

With strap-down INS/GPS systems, accelerometers are mounted rigidly parallel to the axes of a vehicle. This type of system is usually used for aircraft testing. For this, CAST Navigation provides a GPS/INS engineering test system, which is able to observe and analyze the turning rate of a vehicle.

Simulating Accuracy

In real-life situations, system errors occur frequently due to a host of factors. To minimize this, strategic simulations are run alongside GNSS testing. Using mathematical models, different system errors are estimated and compensated.

When equipped with an optional interface, the CAST-4000 can output inertial measurement units, or IMU, directly to a receiver. This allows users to customize their interface according to specific requirements, increasing the efficiency and accuracy of the system.

CAST Navigation’s CAST-4000 is a complete GNS/INS simulation system, with top of the line features and capabilities, designed to provide the most accurate readings possible.

To know more about CAST Navigation’s GNSS Simulation systems, visit:

January 2, 2018