Fiber Optic Gyros & Inertial Measurement Units for Unmanned Systems

KVH Industries Inc.
KVH

KVH is a leading designer and manufacturer of high-performance sensors and inertial systems for the defense and commercial sectors. KVH provides rugged, reliable guidance and stabilization solutions for the most demanding and mission-critical applications. One of the only fiber optic gyro (FOG) manufacturers in the world that draws its own optical fiber, KVH ensures optimal quality control and performance for its gyros and inertial sensors.

KVH’s commercial and militarized off-the-shelf gyros and inertial measurement systems are based on advanced fiber optic technology, resulting in high-precision products with superior performance.

GEO-FOG 3D INS and 3D Dual: Fiber Optic Gyro (FOG)-based Inertial Navigation Systems

Rugged, Highly Accurate INS and AHRS with Embedded GNSS

The KVH GEO-FOG 3D™ inertial navigation system (INS) is a commercial off-the-shelf navigation and control solution built upon the company’s landmark high performance Fiber Optic Gyro (FOG)-based 1750 inertial measurement unit (IMU). The GEO-FOG 3D INS uses sensor fusion to deliver reliable, high-accuracy navigation and control to a wide variety of unmanned, autonomous, and manned aerial, ground, marine, and subsurface marine applications and platforms.

GEO-FOG Fiber Optic Gyro (FOG)-based Inertial Navigation Systems

The advanced GEO-FOG 3D contains three KVH DSP-1750 gyros, the world’s smallest high performance Fiber Optic Gyro (FOG), integrated with three low noise MEMS accelerometers, three axes of magnetometers, a pressure sensor and a triple frequency RTK GNSS receiver. Available as a single or dual antenna INS (GEO-FOG 3D Dual), this highly accurate inertial system includes an innovative algorithm capable of extracting significantly more data from the IMU core processor.

Designed for Critical Control Applications

Designed for demanding navigation and control applications, the GEO-FOG 3D has performance monitoring and instability protections to ensure stable and reliable data. The rugged KVH GEO-FOG 3D INS is designed and tested to ensure that the hardware is both secure and reliable. It is protected from reverse polarity, overvoltage, surges, static and short circuits on all external surfaces. The embedded GNSS includes Receiver Autonomous Integrity Monitoring (RAIM) to assess the integrity of satellite signals. The system also contains a backup MEMS IMU providing seamless inertial data collection for redundancy and backup purposes.

Embedded RTK GNSS Receiver & Integrated North-seeking Gyrocompass

The KVH GEO-FOG 3D contains a triple frequency GNSS receiver providing 8 mm positioning accuracy. It supports all of the current and future satellite navigation systems including GPS, GLONASS, GALILEO, and BeiDou. It also offers data rates up to 1000 Hz, and data can be output over a high-speed RS-422 interface or RS-232 interface. The GEO-FOG 3D features a north-seeking algorithm. This provides accurate heading as fast as 10 seconds after power-on from a hot start, and 10 minutes from a cold start. The north-seeking algorithm runs continuously while the INS is operating, and is unaffected by velocity or angular motion. This means the GEO-FOG 3D provides high accuracy heading in environments in which magnetometers and GPS-heading cannot be used.

Features

  • Commercial Off-the-Shelf high performance INS
  • Precision navigation & positioning even when GNSS is unavailable
  • Supports all current & future satellite navigation systems including GPS, GLONASS, GALILEO and BeiDou
  • Data rate 10x faster than competing systems
  • RS-422 interface or RS 232 interface
  • Core processor: KVH 1750 IMU
  • 6 DoF IMU consisting of integrated FOGs and accelerometers
  • Trimble GNSS receiver
  • North-seeking gyrocompass
  • Altitude and Heading Reference System (AHRS)

1775 Inertial Measurement Unit

The 1775 IMU is KVH’s top-of-the-line inertial measurement unit, designed as a commercial off-the-shelf product but suitable for even the most demanding environments. It integrates fiber optic gyros with low-noise accelerometers and 3 axes of magnetometers, resulting in high accuracy and automatic gyro bias compensation in even very strong magnetic fields.

The 1775 IMU is designed for applications where very high bandwidth, low latency and low drift are of the utmost importance, such as positioning and stabilization of turrets and weapon platforms, antennas, radar, LIDAR, and high-speed gimbals.

Features

1775 Inertial Measurement Unit

  • Extremely high bandwidth (≥1000 Hz)
  • User-programmable data rates from 1-5000 Hz
  • User-configurable baud rate from 9.6 Kbps to 3860 Kbps
  • Asynchronous or synchronous RS-422 protocol
  • 3 magnetometers for magnetic field compensation
  • Compact and lightweight – <0.7 kg (1.45 lbs.)

More: 1775 IMU

1750 Inertial Measurement Unit

The 1750 IMU is an ultra-compact, high-precision inertial measurement unit that combines a miniature fiber optic gyro with extremely low noise MEMS accelerometers. The unit provides excellent bias stability and repeatability and features superior shock, vibration, and thermal functionality.

The 1750 IMU is an ideal solution for any environment where size, weight, and power consumption are at a premium, such as unmanned systems. Potential applications include navigation, guidance, optical equipment, and precision pointing.

Features

1750 Inertial Measurement Unit

  • Superior precision – bias instability ≤ 0.1°/hr, 1σ, highly accurate 6-degrees-of-freedom angular rate and acceleration data
  • Compact package – 88.9 mm Dia. x 73.7 mm h (3.5” x 2.9”), <0.7 kg (<1.4 lbs.)
  • Flexible, user-friendly programmable data output rates from 1 – 1000 Hz
  • Industry-standard RS-422 protocol

More: 1750 IMU

1725 Inertial Measurement Unit

The 1725 IMU is a lightweight, six degree-of-freedom, high-performance inertial measurement unit designed as a drop-in replacement for high-cost competing IMUs. Incorporating three high-performance gyros and three low-noise MEMS accelerometers, it provides both affordability and high stability and bandwidth.

The 1725 IMU is a highly versatile platform that is suitable for a wide range of demanding applications, such as inertial navigation systems for unmanned vehicles, precision stabilization and pointing systems for radar, optical systems, antennas and weapons platforms, and high-accuracy mobile mapping systems.

Features

1725 Inertial Measurement Unit

  • High bandwidth, low noise
  • Programmable data output rates from 1 to 1000 Hz
  • Asynchronous or synchronous RS-422 protocol
  • Compact and lightweight – <0.7 kg (1.45 lbs.)

More: 1725 IMU

DSP-1760 Fiber Optic Gyro

The DSP-1760 FOG is a versatile, solid-state navigation-grade gyro that is available in 1, 2 or 3 axes, encased within an easy-to-integrate an environmentally sealed housing. Providing high bandwidth and low noise, the DSP-1760 gyro offers superior performance in bias stability, scale factor and angle random walk.

The DSP-1760 gyro is highly adaptable and suitable for a wide range of challenging military and commercial applications, including weapons platform stabilization for land, sea, and aerial manned and unmanned systems, as well as navigation, guidance and control systems.

Features

DSP-1760 Fiber Optic Gyro

  • Available in six configurations: 1, 2, or 3 axes, each with 15-pin Micro-D connector or 13-pin circular connector
  • RS-422 digital interface
  • Bandwidth: ≥440 Hz (±4%)
  • Compact package – 88.9 mm D x 73.7 mm H (3.5 in. x 2.9 in.)
  • Angle Random Walk (ARW): ≤0.012°/√hr
  • Environmentally sealed, lightweight housing – from 0.5 to 0.6 kg (1.1 to 1.32 lb.) depending on number of axes

DSP-1750 Fiber Optic Gyro

The DSP-1750 FOG is a highly compact gyro with a flexible two-piece design that enables the optical sensor to be installed directly on the required axis with the control electronics mounted elsewhere. The unit is available in single- or dual-axis configurations and with analogue or digital outputs.

The DSP-1750 gyro is ideal for a wide range of precision pointing, stabilization and navigation applications, including weapons and equipment platforms, autonomous vehicle navigation, longer-range optical and sensor systems, and high-speed gimbals.

Features

DSP-1750 Fiber Optic Gyro

  • Angle Random Walk ≤0.013°/√hr (digital).
  • ±490°/sec and ±1000°/sec* input rate options delivering very high bandwidth
  • Superior bias instability of ≤0.1°/hr., 1σ
  • Magnetically shielded option
  • Excellent scale factor and linearity in compact size offers high performance for applications with size and weight restrictions

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