VN-310 Introduction

The VN-310 is a tactical-grade, high-performance Dual Antenna GNSS-Aided Inertial Navigation System (Dual GNSS/INS). Incorporating the latest MEMS sensor and GNSS technology, the VN-310 combines 3-axis accelerometers, 3-axis gyros, 3-axis magnetometers and two 72 Channel GNSS receivers into a compact, ruggedized, IP-68 rated aluminum anodized enclosure to deliver a high-accuracy position, velocity and attitude solution under static and dynamic conditions.


Ruggedized Packaging

The VN-310 features a precision milled, anodized aluminum enclosure designed to meet DO-160G standards. With dual I/O connectors the VN-310 offers maximum flexibility for interfacing with external GNSS receivers and IMUs. The VN-310 has an input voltage of +12 to +36 VDC power supply over a RS-422 interface.

Size: 56 x 56 x 31 mm
Power Consumption: < 2.5 watts
Weight: 200 g

Enclosed in a precision anodized aluminum enclosure, the VN-310 offers additional protection of the internal MEMs sensors and electronics. The use of precision CNC milled aluminum parts ensures that the axis alignment provided by our factory calibration process is maintained during installation in its final configuration. Interfacing with the module is made through circular push-pull 10-pin connectors.

» Review VN-310 Documentation


Fischer UltiMate Circular Push-Pull Connector

GPS Antenna Van

Dual GNSS-Compassing Algorithm

The VN-310 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, which 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.

Key features of VectorNav's GNSS-Compass algorithms include:

-  Magnetic independent
-  Automatic transition between AHRS, INS and GNSS-Compass
-  Adjustable GNSS antenna baseline lengths for shorter start-up times or increased
   heading accuracy
    -  Heading accuracy between 0.15° and 1.2° (RMS)
    -  Start-up in under 2 minutes
- Raw pseudorange, Doppler & carrier phase outputs


Extended Inertial Sensor Thermal Calibration

MEMS inertial sensors are subject to several common sources of error: bias, scale factor, misalignments, temperature dependencies, and gyro g-sensitivity. To ensure the highest level of accuracy, each VN-310 sensor undergoes a rigorous calibration process to minimize these error sources. Compensation parameters calculated during these calibrations are stored on each individual sensor and digitally applied to the real-time measurements. This calibration process is performed over the full thermal operating range of the VN-310 (-40°C to +85°C).

» Learn more about inertial sensor calibration



GPS/INS Kalman Filter Graph

GNSS/INS Kalman Filter

The VN-310 incorporates the latest advancements in aerospace-grade Extended Kalman Filter (EKF) inertial navigation algorithms specifically tailored to solve problems typically faced by industrial users. The VN-310 utilizes the onboard EKF to optimally combine high bandwidth inertial sensor measurements with high-accuracy, low bandwidth GNSS measurements to provide high-accuracy, low latency position, velocity, and attitude measurements.

Key features of VectorNav's INS algorithms include:

- Automatic filter initialization & dynamic alignment
- Real-time gyro & accel bias tracking & compensation
- GPS delay compensation
- Synchronized to GPS time
- Automatic transitioning between AHRS & INS modes
- Operates as a True Inertial Navigation System - no mounting restrictions or velocity
  alignment assumptions

» Learn more about Inertial Navigation Systems

Tactical-Grade MEMS IMU

Utilizing the latest advancements in Microelectromechanical systems (MEMS) technology, the VN-310 incorporates an suite of tactical-grade inertial sensors, including a 3-axis accelerometer, 3-axis gyroscope and 3-axis magnetometer. The VN-310 has been designed to achieve the highest performance possible by filtering out common error sources, such as sensitivity to supply voltage variations and temperature dependent hysteresis.

» Learn more about Inertial Measurement Units
  • < 1 °/hr in-run gyro stability
  • < 10 µg in-run accel bias stability
  • Ultra low noise accel and gyro
    (0.04 mg/√Hz and 3.24 °/hr / √Hz)
  • High accel and gyro ranges
    (±15 g and ±490 °/s)
GPS Satellites

High Sensitivity GNSS Receivers

The VN-310 incorporates two onboard high-sensitivity 72-channel, L1, GNSS receivers. Two SMA connectors are provided for connection to external active GNSS antennas.

Receiver Type: 72-channel L1 GNSS
Update Rate: 5 Hz
Sensitivity: -159 dBm Tracking
Time-to-First-Fix (Cold/Warm Start): 26 s
Time-to-First-Fix (Hot Start): < 1 s

» Learn more about GPS