1725 IMU

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Inertial Solutions in Autonomous Ground Reference Systems

Fiber Optic Gyro IMU: FOG-based Performance at MEMS Prices
The 1725 Inertial Measurement Unit (IMU) is a 6-degrees-of-freedom (6-DOF) inertial sensor delivering the outstanding performance and stability of KVH’s fiber optic gyros (FOGs) at prices comparable to lower performing MEMS-based inertial measurement units. The 1725 IMU offers an ideal solution for engineers working with higher level integrated navigation and stabilization systems. This affordable, high performance commercial-off-the-shelf IMU is comprised of three high performance DSP-1750 gyros integrated with three low noise MEMS accelerometers. It is ideal for applications in which affordability, high bandwidth, and high performance are essential.   

Compact design for easy integration  
The compact 1725 IMU weighs less than 0.7 kg (1.45 lbs.), and designed as a convenient drop-in replacement package. The 1725 IMU was developed to deliver versatile, reliable performance. It provides flexible interfaces, programmable message outputs, and selectable baud and data rates. The 1725 IMU meets the needs of a broad range of challenging 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. 

Highly adaptable, the 1725 IMU features RS-422 asynchronous or synchronous communication with user programmable data rates from 1 to 1000 Hz. With its high bandwidth and low noise, the low-cost 1725 IMU can provide the data output required for the most challenging applications. Designers no longer have to choose between price and performance – they 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

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.


  • High bandwidth
  • Low noise
  • Excellent shock and vibration performance
  • 3 high-performance KVH FOGs
  • 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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