Product
VN-300 SMD

Introduction

The VN-300 SMD (Surface Mount Device) is a miniature high-performance dual GPS-Aided Inertial Navigation System that combines MEMS inertial sensors, two high-sensitivity GPS receivers, and advanced Kalman filtering algorithms to provide optimal estimates of position, velocity, and orientation for industrial applications.  By utilizing two separate GPS receivers and antennas the VN-300 enables accurate heading measurements without reliance on vehicle dynamics or magnetic sensors, providing unmatched performance under both static and dynamic conditions.

divider

GPS / INS Kalman Filter

The VN-300 incorporates the latest advancements in Aerospace grade Kalman filter inertial navigation algorithms specifically tailored to solve problems typically faced by industrial users.

Industrial control applications require high accuracy low latency position, velocity, and attitude measurements. GPS provides long-term position accuracy, but is incapable of providing low-latency high bandwidth measurements. Inertial sensors provide high bandwidth acceleration and angular rates, but cannot provide long-term position and orientation accuracy due to drift and integration errors. Utilizing an onboard Extended Kalman Filter the VN-300 is capable of combining in an optimal manner the high bandwidth inertial measurements with the high accuracy low bandwidth GPS measurements. The VN-300 provides industrial users with access to a continuous stream of low latency high accuracy position velocity and attitude measurements at a rate of up to 400Hz.

GPS/INS Kalman Filter Graph
divider
Diagram

10-Axis MEMS IMU

Utilizing the latest advancements in MEMS technology, the VN-300 incorporates a wide assortment of inertial sensors including a 3-axis accelerometer, 3-axis gyroscope, 3-axis magnetometer, and a barometric pressure sensor. The VN-300 has been carefully designed to provide the highest performance achievable, by eliminating common error sources such as sensitivity to supply voltage variations and temperature dependent hysteresis. To provide the highest level of accuracy, each VN-300 is individually tested and characterized over the full operating temperature range to determine the bias, sensitivity and cross-axis alignment for each individual sensor. Calibration coefficients are stored on the sensor and are fully temperature compensated in real-time onboard to ensure high accuracy measurements over the full operating temperature range.

divider
GPS Satellites

High Sensitivity GPS Receivers

The VN-300 incorporates two onboard high sensitivity 50-channel u-blox GPS modules. Two MMCX connectors are provided for connection to external active antennas.

Receiver Type: 72-channel u-blox GPS L1 GNSS
Update Rate: 5 Hz
Sensitivity: -159 dBm Tracking
Cold Start: 26s
divider
GPS Antenna Van

Dual GPS Compassing Algorithm

The VN-300 provides the ability to accurately estimate true heading (azimuth with respect to True North) in both static as well as dynamic conditions without any reliance on magnetic sensors. This is accomplished by utilizing GPS interferometry techniques that utilize the raw pseudo-range and carrier phase measurements from two separate internal GPS receivers with a known baseline to directly measure the heading of the vehicle or platform without any assumptions regarding the vehicle dynamics (RTK moving baseline technique). This is a crucial feature for applications that require an accurate heading at startup, or in situations where insufficient motion is present to perform dynamic alignment. The capability to derive heading directly from two separate GPS receivers is a feature typically offered only on much larger and more expensive INS systems. Over the past two years, VectorNav engineers have combined traditional GPS interferometry techniques, new state-of-the-art computational efficient algorithms, and adaptive tuning techniques utilized in our existing VN-100 and VN-200 product lines, to create a new approach to GPS compassing. This new GPS compass approach enables the use of GPS receivers that are significantly smaller and lower cost than those required by systems relying on traditional methods. Whether it is for a military, marine, aerospace, or other industrial application, this new approach to a GPS compass enables the VN-300 to provide users with accurate and reliable heading measurements in both static as well as dynamic conditions at a fraction of the size and cost of competing systems.