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WHAT IS WMS?
It is a MEMS inertial unit that mounts directly onto a vehicle wheel. It is a self-contained device - it has a battery, a Bluetooth radio channel and it makes the calculations in real time on its own
«If you are involved in R&D of navigation or vehicle monitoring systems, WMS units will provide you accurate and important data right from the wheel»
WHAT WMS MEASURES?
The WMS measures the instantaneous speed of the wheel rotation, wheel rotation angle, the number of revolutions of the wheel, heading of the wheel and, if the wheel diameter is specified, it gives the speed, the path traveled by the wheel and the coordinates of the wheel relative to the beginning of the path
«You can install WMS units on each wheel of the vehicle - you will have complete information about the rotation of all wheels of your vehicle»
HOW DOES IT WORK?
The WMS uses patented algorithms for inertial data processing during rotation - this allows obtaining a solution that is far more accurate than the common-to-use wheel ticks.

Here is a technical paper that explain some math and details behind the magic: Design and performance of wheel-mounted MEMS IMU for vehicular navigation
«We patented our technology in many countries around the world. Some patent publications are: CA 2,869.46, US 9,885,575 B2; RU 2631401»
DOES WMS WORK IN REAL TIME?
Yes, all sensor processing is done inside the WMS and the real-time solution, that can be customized for every user, is transmitted via Bluetooth (BLE). Also, all WMS units have a built-in memory card that records all the raw data for possible post-processing
«Access to the raw data is restricted by default. Having access to the raw data should be negotiated at the stage of placing an order for any WMS sensor»
WHAT CAN I DO WITH THE «RAW» DATA?
The «raw» data from gyroscopes and accelerometers is recorded at high frequency on an internal memory card and can be used to build custom navigation or dynamics monitoring algorithms. You can, for example, use it to obtain a more accurate solution when processing on a computer in post-processing mode using Kalman filtering (EKF). And we can also help with this!
All applications are unique in some way - we are ready to discuss them all with you!
DOES WMS HAVE A BUILD-IN BATTERY?
Yes, the WMS has a built-in rechargeable battery, and it can operate autonomously for up to 8 hours without recharging. We also have versions of the WMS with an extended battery pack that can operate for up to 30 days, and even a wired version for some very specific and custom applications
«The WMS-LP is a truly «install and forget» solution for mining equipment and applications»
IS WMS BIG?
Yes and no. The WMS had rather been developed as a technology demonstrator that is both convenient for user operate and for us to maintain and support. We can either make it smaller for specific customer applications, or make it larger to increase the built-in battery or to additionally protect the unit against external hits, impacts, moist/dirt etc.
«The WMS-LP is really big, but you don't need to charge it for 30 days!»
HOW DO I INSTALL WMS ON MY WHELL?
Each wheel is different, but we can recommend how to mount the WMS for each specific case. We recommend it to be rigidly fixed closer to the center of rotation of the wheel, for example through an intermediate plate, which is attached to the bolts of the wheel itself
«The safest, and probably the best, way to mount a WMS to a wheel is through an intermediate plate that is attached to the wheel bolts»
DOES WMS PROVIDE GPS COORDINATES?
No. There is no GNSS receiver inside the WMS units. WMS is truly an inertial sensor and, like all inertial systems, it provides a relative solution. For example, relative coordinated in respect to some initial point (start of the path). Therefore, if you need absolute coordinates or position solution, you need to integrate the WMS solution with GNSS-based systems
«In many cases, the trajectory and dynamics of the vehicle are more important than absolute positioning solution. In such cases, the WMS sensor is self-sufficient»
IS IT POSSIBLE TO INtEGRATE YOUR WMS TO 3-rd PARTY SOFTWARE?
Yes, we can develop additional drivers or parsers for easy integration of our sensors into your systems, for example to NovAtel Inertial Explorer or to other mapping programs
«The WMS sensor sends data over several protocols in a human-readable format»
HOW MANY UNITS CAN YOU MAKE IN A YEAR?
A lot! We can make one WMS, or two, or we can make a million - it all depends on the customer's requirements. There are no critical, irreplaceable, or hard-to-acquire parts in the design, it is all COTS components
«The price of WMS depends on the quantity of the order and possible additional modifications according to the customer's specific requirements»
WOULD LIKE TO LEARN MORE ABOUT WMS TECHNOLOGY?
Wheel navigation is something completely new and hard to grasp at a glance, we understand. Contact us and we will answer all your questions! Also take a look at data sheets and manuals, there is a lot of useful information
PI-WMS
Output data packet rate
Interface
Wheel rotation rate

Wheel heading angle rate
Heading angle error

Wheel rotation rate error

Weight
Dimensions
Enclosure
Max. operation time
on a build-in battery
Charging time
Operating temperature range
PI-WMS-LP
Output data packet rate
Interface
Wheel rotation rate

Wheel heading angle rate
Heading angle error

Wheel rotation rate error

Weight
Dimensions
Enclosure
Max. operation time
on a build-in battery
Charging time
Operating temperature range
PI-WMS-W
Output data packet rate
Interface
Wheel rotation rate

Wheel heading angle rate
Heading angle error

Wheel rotation rate error

Weight
Dimensions
Enclosure
Max. operation time
on a build-in battery
Charging time
Operating temperature range
10 Hz
BLE
up to 10 full revolutions per sec (600 rpm)
< 1000 deg/sec
1 deg per 1 hour of driving time *
< 0.001 of wheel perimeter in sec
< 300 g
Ø97x38 mm
IP-67
8 hours

<2 hours

-20C…+50C
10 Hz
BLE
up to 10 full revolutions per sec (600 rpm)
< 1000 deg/sec
1 deg per 1 hour of driving time *
< 0.001 of wheel perimeter in sec
< 2 kg
219x219x38 mm
IP-67
30 days

<20 hours

-20C…+50C
10 Hz
USB
up to 10 full revolutions per sec (600 rpm)
< 1000 deg/sec
1 deg per 1 hour of driving time *
< 0.001 of wheel perimeter in sec
< 350 g
Ø97x46 mm
IP-67
N/A

N/A

-20C…+50C
* no tire slips, no skidding
DATA SHEET
MANUAL
SAMPLE DATA
STEP MODEL
DRAWING
downloads
PI-WMS PI-WMS-LP PI-WMS-W
PI-WMS PI-WMS-LP PI-WMS-W
PI-WMS PI-WMS-LP PI-WMS-W
PI-WMS PI-WMS-LP PI-WMS-W
PI-WMS PI-WMS-LP PI-WMS-W
PI-WMS PI-WMS-LP PI-WMS-W

PI-WMS PI-WMS-LP PI-WMS-W

PI-WMS PI-WMS-LP PI-WMS-W

PI-WMS PI-WMS-LP PI-WMS-W

PI-WMS PI-WMS-LP PI-WMS-W