1725 IMU

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1725 IMU

Inertial Solutions in Autonomous Ground Reference Systems

Fiber Optic Gyro IMU: Superior Performance at MEMS Prices
The 1725 IMU (Inertial Measurement Unit) is a game-changing 6-degrees-of-freedom (6-DOF) sensor that delivers the high performance and stability of KVH’s fiber optic gyros (FOGs) at MEMS prices. Designers of higher level integrated systems will find the 1725 IMU the ideal solution for a wide range of navigation and stabilization applications. With three high performance DSP-1750 gyros and three low noise MEMS accelerometers, this commercial-off-the-shelf, low cost/high performance IMU is ideal for applications in which affordability, high performance and high bandwidth are critical. 

Compact package, designed for ease of integration
Weighing less than .07 kg kg (1.45 lbs.), the 1725 IMU is designed as a compact, drop-in replacement package for competing higher-cost IMUs. The flexible interfaces, programmable message outputs, and baud and data rates make the 1725 IMU highly versatile for a broad range of demanding applications such as inertial navigation systems for unmanned platforms, precision stabilization systems for radar and optical systems, precision pointing and stabilization systems for antennas and weapons platforms, as well as high accuracy mobile mapping systems.

The 1725 IMU is highly adaptable, featuring RS-422 asynchronous or synchronous communication with user programmable data rates from 1 to 1000 Hz. Scalable with high bandwidth and low noise, the 1725 IMU can provide the data output required for the most challenging applications, and still help keep program costs low. KVH’s 1725 IMU makes the traditional choice between performance and price obsolete. Get both FOG-quality performance and the affordability of MEMS with the KVH 1725 IMU.

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Performance Fiber Optic Gyro

Fiber Optic Gyros


Input Rate (maximum)


Bias Instability (25°C)

≤0.1°/hr, 1σ

Bias vs. Temp (≤ 1 °C/min)

≤4°/hr, 1σ

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

≤200 ppm, 1σ

Scale Factor vs. Temp. (≤ 1 °C/min)

≤300 ppm, 1σ

Angle Random Walk (25°C)


Bandwidth (-3dB)

≥440 Hz

Technology - Accelerometers
MEMS Silicon
Input Limit (maximum)
±10 g
Bias Instability (constant temp)

≤0.1 mg, 1σ

Scale Factor Temperature Sensitivity
250 ppm/°C, 1σ (max),
≤100 ppm/°C, 1σ (typical)
Velocity Random Walk (25°C)
(0.23 ft/sec/√hr)
Bandwidth (-3dB)*
≥200 Hz
Initialization Time (valid data)

≤3 secs

Data Interface
Asynchronous or Synchronous RS-422
Baud Rate
Selectable 9.6 Kbps to 921.6 Kbps
Data Rate

User selectable
1 to 1000 Hz

Dimensions (max)

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

Weight, max

0.7 kg (1.45 lbs.)

Power Consumption, max (typical)

8 W (max),
5 W (typical)

Input Voltage

+9 to +36 VDC

Temperature: Operating

-40°C to +65°C
(-40°F to +167°F)

Shock: Operating

9 g, 11 msec, sawtooth

Vibration: Operating

8 g rms, 20-2000 Hz random

*Based on Accelerometer manufacturer specifications, verified during test

Brochures & Datasheets

Document File Info
DATASHEET - 1725 IMU PDF file 881 KB / 2 pg
DATASHEET - 1725 光ファイバージャイロ慣性計測装置 - (Japanese) PDF file 865 KB / 2 pg

Additional Documents, Forms & Pricing

Case StudiesFile Info
May Mobility Solves Autonomous Vehicle Positioning Challenges with Accurate and Affordable KVH Inertial Sensors PDF file 283 KB / 6 pg
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
May Mobility Solves Autonomous Vehicle Positioning Challenges with Accurate and Affordable KVH Inertial Sensors - This case study focuses on how May Mobility's engineers developed a positioning solution for its autonomous vehicles with an innovative dead reckoning system that uses KVH's 1725 IMU as the backbone for the system. PDF file 283 KB / 6 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.


  • High bandwidth for demanding applications
  • Low noise
  • Superior shock and vibration performance
  • 3 high-performance KVH FOGs provide superior, reliable performance
  • 3 high quality MEMS accelerometers
  • High accuracy 6-DOF angular rate and acceleration data
  • Versatile interfaces
  • Drop-in replacement design  
  • Asynchronous or synchronous RS-422 protocol

Featured Options

  • Adjustable baud rate to minimize communication latency, and receive accurate data even faster
  • Designed for drop-in replacement
  • 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 IMU and the DSP-1750 Fiber Optic Gyro (FOG). 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 allowing the production of very small FOGs that provide very high bandwidth with 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. 

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.

Watch the Video

1725 IMU: Choosing the Right FOG to Meet Your Needs


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

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