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SPACE / Attitude & navigation / REVIEWED 2026-09-11

C04Inertial measurement unit

Measure rotation and, where needed, acceleration.

Manufacturers & products

An inertial measurement unit combines angular-rate and linear-acceleration sensing. Many satellite catalogs instead offer a three-axis gyro or space-rate sensor; those useful alternatives are identified explicitly here.

These are sourcing candidates, not a confirmed Starlink supply chain.

manufacturer

Safran Sensing Technologies Norway

STIM377H / STIM space inertial products

Hermetic MEMS inertial products include complete STIM377H IMUs and separate gyro modules, with supplier radiation-characterization material for space selection. [2]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

STIM277H is a gyro module; STIM377H includes accelerometers.

View product & inquiry route

manufacturer

Northrop Grumman

LN-200S / LN-200HPS

Space IMU family combining three fiber-optic gyroscopes and three MEMS accelerometers; the HPS configuration adds performance and radiation-hardness improvements. [3]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

Request the specific S or HPS configuration and its qualification evidence.

View product & inquiry route

manufacturer

Exail

Astrix NS-IMU

Complete fiber-optic-gyro IMU with accelerometers for spacecraft maneuvers and navigation; distinct from the Astrix NS gyro-only unit. [4]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

Qualification roadmap is ongoing in the dedicated product-page description; confirm delivered flight status.

View product & inquiry route

manufacturer

Honeywell Aerospace

HG4934SRS three-axis space-rate sensor

Compact angular-rate sensor intended for smallsat attitude determination; this is a gyro sensing unit rather than a complete accelerometer-equipped IMU. [5]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

No linear-acceleration measurement is established for this rate-sensor product.

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manufacturer

InnaLabs

ARIETIS / ARIETIS-NS

Three-axis space gyro products with different mission architectures; ARIETIS-NS uses screened COTS-based electronics and is offered for serial production. [6]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

Gyro-only alternative; do not infer accelerometer channels or copy ARIETIS performance to ARIETIS-NS.

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manufacturer

Space Inventor

IMU-P4

Redundant IMU module with Murata SCH16T-K01 inertial sensors and RM3100 magnetometers. [1]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

Integrated module; confirm sensor redundancy and calibration configuration.

View product & inquiry route

manufacturer

AAC Clyde Space

PG400 gyroscope

Standalone smallsat gyroscope with RS422 request/response interface, temperature characterization and a compact module form factor. [7]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

Gyroscope rather than six-degree-of-freedom IMU; public introductory and table noise units conflict.

View product & inquiry route

manufacturer

Astrofein

AGS-1 gyro system

Three-axis temperature-compensated rotation sensor with free-running and triggered modes; accelerometers can be requested as an additional configuration. [8]

Manufacturer inquiry

Request the configuration and current quotation from the official manufacturer; catalog presence is not evidence of stock or delivery schedule.

Product scope & qualifications

Default product is a gyro system; accelerometer inclusion is not assumed.

View product & inquiry route

What remains unverified

Exail currently describes Astrix NS-IMU qualification progressing beyond TRL 6 toward TRL 9; do not inherit the older Astrix gyro flight status.
Astrix NS-IMU product page and family materials give different angular-random-walk values; the current dedicated page value is used.
AAC PG400 introductory random-walk unit differs from its technical table; use the signed datasheet revision.

Where it comes from

A company address is shown separately from a published factory location. Request the manufacturing site and lot traceability for the exact part when sourcing.

What to compare

Measurement functions
Distinguish three angular-rate axes from six-degree-of-freedom gyroscope-plus-accelerometer measurement.
Bias stability · °/h; mg
Compare in-run stability with turn-on repeatability and long-term bias; hold temperature and averaging interval constant.
Random walk and noise · °/√h; m/s/√h
Compare angular/velocity random walk using the same units and filter settings.
Dynamic range · °/s; g
Check gyro saturation and acceleration range against separation, maneuvers and safe-mode conditions.
Scale factor and thermal effects · ppm; °C/min
Include scale-factor error, cross-axis sensitivity and gradients in navigation error budgets.
Sample timing · Hz; ms
Assess sample rate, latency, timestamping, external triggers and synchronization to the flight computer.
Electrical and mechanical budget · W; V; kg; mm
Include electronics, heater needs and mount alignment in complete unit SWaP.
Radiation and calibration
Request test evidence for the delivered grade, calibration data, life limits and sensitivity to power cycling.

Selection & integration notes

A three-axis space-rate sensor can bridge attitude updates but cannot directly measure linear acceleration.
A component radiation test or COTS characterization does not establish qualification for every orbit and mission duration.
Selecting a flight IMU requires both sensor error modeling and flight-software integration.

Published product examples

3 REFERENCES

Specifications belong to the named product and configuration.

Safran STIM377HSafran Sensing Technologies Norway

Gyro input range: ±400 °/s[9]Nominal range in product brief.
Accelerometer range: ±10 g[9]Nominal standard range; ±5 g and ±30 g are options.
Gyro bias instability: 0.3 °/h[9]Nominal; distinct from bias error under thermal gradients.
Angular random walk: 0.15 °/√h[9]Nominal table value.
Power: 1.5 W nominal; 2 W maximum[9]Product-brief table.
Sample rate: Up to 2,000 samples/s[9]Maximum table value.

Example sources [9]

Exail Astrix NS-IMU — dedicated product pageExail

Angular random walk: 0.005 °/√h[4]Dedicated product-page specification; family-page figure differs.
Bias stability: 0.005 °/h[4]Over 1 hour at steady temperature.
End-of-life bias stability: 0.2 °/h[4]All effects included, as specified by manufacturer.
Mass: <1.95 kg[4]Complete NS-IMU configuration.
Envelope: 130 × 130 × 117 mm[4]NS-IMU, not the smaller gyro-only Astrix NS.
Power: <15 W[4]Dedicated page; operating-point detail to confirm.

Example sources [4]

Astrofein AGS-1 — gyro-only baselineAstrofein

Angular-rate range: ±40 °/s[8]Per channel.
Bias: ≤1 °/h[8]Per channel; averaging conditions not given on product page.
Random walk: ≤0.1 °/√h[8]Per channel.
Measurement frequency: 200 Hz[8]Published sensor rate.
Power: 8 W steady state; 10 W maximum[8]Manufacturer table.

Example sources [8]

Sources & references

REVIEWED 2026-09-11

Manufacturer pages and technical documents support the linked claims. A review date is not a publication date or stock check.

Guidance, navigation and control catalog Space Inventor · Publication date not stated
WHL-P4, STR-P3, FSS-P3, IMU-P4 and MT-P4 product scope; IMU sensor composition.
Accessed 2026-09-10
STIM377H / STIM space inertial products Safran Sensing Technologies Norway · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
LN-200S / LN-200HPS Northrop Grumman · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
Astrix NS-IMU Exail · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
HG4934SRS three-axis space-rate sensor Honeywell Aerospace · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
ARIETIS / ARIETIS-NS InnaLabs · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
PG400 gyroscope AAC Clyde Space · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
AGS-1 gyro system Astrofein · Publication date not stated
Official product identity, sensing/actuation scope and interface information.
Accessed 2026-09-10
STIM377H product brief Safran Sensing Technologies Norway · Publication date not stated
IMU sensing axes, nominal ranges, bias instability, random walk, power and sample-rate table.
Accessed 2026-09-10