1775 IMU

17751 IMU1775 app mil_11775 app mil_2
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1775 app mil_1

Inertial Solutions in Autonomous Ground Reference Systems

Premium performance for challenging applications and demanding environments
The 1775 IMU is the premium high performance inertial measurement unit offered by KVH, now available with either 10g or 25g accelerometers. Designed as a commercial off the shelf product, the 1775 IMU nevertheless is used in the most challenging environments, such as military systems requiring extremely high performance. The 1775 IMU joins the KVH portfolio of high performance IMUs built with the proven technology of the DSP-1750 and DSP-1760 fiber optic gyros (FOGs), the world’s smallest high performance FOGs. These highly accurate FOGs are integrated with low noise accelerometers as well as 3 axes of magnetometers for automatic gyro bias compensation in the presence of strong magnetic fields. For systems and applications where very high bandwidth, low latency and low drift are mission critical, the 1775 IMU is the best solution available.

Compact design for ease of integration
The integration of the 1775 IMU into higher level systems is simplified with flexible interface and programmable message outputs. User-programmable features include an adjustable baud rate so that communication latency can be adjusted to receive accurate data even faster. An RS-422 asynchronous full differential interface with user-programmable update rates from 1 to 5000 Hz make the 1775 IMU easy to integrate into higher level navigation and stabilization systems. KVH’s proven fiber optic technology and solid state design provide long life and dependable, consistent operation, and the robust design of the 1775 IMU ensures reliable and highly accurate performance. Targeted to meet the needs of the most dynamic environments and applications, the size of the 1775 IMU, which weighs 0.7 kg (1.5 lbs.), makes it an ideal drop-in replacement for larger, more expensive IMUs.

Very high bandwidth with low latency for critical applications
The 1775 IMU is the perfect solution for applications designed for such challenging environments as turret and weapon platform stabilization and pointing, antenna platform positioning and stabilization, mobile mapping systems, and stabilization systems for radar, LIDAR, and high-speed gimbals. The 1775 IMU also has a 3-axis magnetometer which make it an ideal choice for applications with environments requiring magnetic field compensation.

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Performance Fiber Optic Gyro

Fiber Optic Gyros


Input Rate (maximum)


Bias Instability (25°C)

≤0.1°/hr, 1σ (max)
≤0.05°/hr, 1σ (typical)

Bias vs. Temp (≤ 1 °C/min)

≤1°/hr, 1σ (max)
≤0.7°/hr, 1σ (typical)

Scale Factor Non-Linearity (max rate, 25°C)

≤50 ppm, 1σ

Scale Factor vs. Temp. (≤ 1 °C/min)

≤100 ppm, 1σ

Angle Random Walk (25°C)


Bandwidth (-3dB)

≥1000 Hz

Technology - Accelerometers
MEMS Silicon
Input Limit (maximum)

±10 g
±25 g

Bias Instability (constant temp)

≤0.05 mg, 1σ

Scale Factor Temperature Sensitivity

≤500 ppm, 1σ (max)
(full scale, full temp)

Velocity Random Walk (25°C)

(0.23 ft/sec/√hr)

Bandwidth (-3dB)*

±10 g: ≥200 Hz

±25 g: ≥450 Hz

Initialization Time (valid data)

≤1.5 secs

Data Interface

RS-422, Asynchronous,
Full Differential

Baud Rate

Selectable 9.6 Kbps to 4147 Kbps

Data Rate

User selectable 1 to 5000 Hz

Dimensions (max)

88.9 mm Dia. x 73.7mm H
(3.5" x 2.9")

Weight, max

0.7 kg (1.5 lbs.)

Power Consumption, max (typical)

8 W (max),
5 W (typical)

Input Voltage

+9 to +36 VDC

Temperature: Operating

-40°C to +75°C
(-40°F to +167°F)

Shock: Operating

±10 g: 9 g, 11 msec, sawtooth

±25 g: 25 g, 11 msec, sawtooth

Vibration: Operating

±10 g: 8 g rms, 20-2000 Hz

±25 g: 15 g rms, 20-2000 Hz

Input Range
±10 Gauss (max)

<0.2 Gauss

Bias Noise (ms)

<2 mGauss

*Based on Accelerometer manufacturer specifications, verified during test

Brochures & Datasheets

Document File Info
DATASHEET - 1775 IMU PDF file 778 KB / 2 pg

Additional Documents, Forms & Pricing

White PapersFile Info
High Accuracy Multi-Sensor Navigation Solutions for Overcoming GNSS in Unmanned and Autonomous Systems - 3rd Edition - This paper discusses how the combination of high performance KVH inertial measurement units integrated with GNSS results in extremely precise inertial navigation solutions that overcome numerous GNSS vulnerabilities. PDF file 1.5 MB / 7 pg



Strong magnetic fields have the ability to cause apparent drift in the gyro bias. This is due to the Faraday effect on the laser light in the sensing coil resulting in non-reciprocal light paths. While this effect can be observed in gyros designed for precision inertial navigation systems (drift rates of less than 1 degree per hour), and can be mitigated by the use of mu-metal shielding, there have been no reported problems with KVH FOGs. If your application results in mounting a FOG near a very strong magnetic field (>50 gauss), a practical test to determine sensitivity is suggested.


  • Extremely high bandwidth (≥1000 Hz)
  • User-programmable update rates from 1 to 5000 Hz
  • User-configurable baud rate from 9.6 Kbps to 4147 Kbps
  • Asynchronous RS-422 protocol, full differential
  • 3-axis of magnetometer for automatic magnetic field compensation
  • Compact and lightweight - 88.9 mm Dia. x 73.66 mm h (3.5" x 2.9");  <0.7 kg (1.5 lbs.)

Featured Options

  • Adjustable baud rate to minimize communication latency, for accurate, fast, and reliable data
  • FOG/IMU Developer’s Kit with easy-to-use software accelerates your IMU and FOG integration, development, and interface efforts. Learn more.

Exclusive Technology

  • E•Core Technology
    KVH’s breakthrough proprietary polarization maintaining E•Core ThinFiber enables high performance in much smaller gyros and inertial systems, such as the 1725 and 1750 IMU, and the DSP-1750 and 1760 Fiber Optic Gyros (FOGs). By minimizing the overall diameter of KVH’s standard E•Core fiber, the resulting ThinFiber significantly and reliably boosts the accuracy of all KVH gyros, and allows the production of very small FOGs with very high bandwidth and very low noise.
  • DSP Technology
    KVH’s Digital Signal Processing (DSP) electronics improve fiber optic gyro performance in critical areas including scale factor and bias vs. temperature, scale factor linearity, and maximum input rate. KVH’s exclusive DSP design is protected by multiple patents, and overcomes the limitations of analog signal processing which eliminates temperature-sensitive drift and rotation errors.

Watch the Video

1775 IMU: Choosing the Right FOG to Meet Your Needs

White Papers & Case Studies

  • Learn more! Download and read our white papers for more details about KVH's fiber optic gyro technology.*

* To access these white papers, you will be required to provide us with your contact information.


* To access these manuals, you will be required to provide us with your contact information.

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