Speed Wedge MKII Radar speed sensor

Product Overview

Speed measurement for in-door and off-highway vehicles, conveyor belts, material flow, open channel water surface flow ...

Speed Wedge MKII true ground speed sensor

Speed Wedge MKII is a true-gound speed sensor and active motion detector for moving objects, based on Radar Doppler technology. Speed Wedge MKII deploys a Radar Frontend with planar antennas continously emitting electro­magnetic waves at 24 GHz. Due to the move­ment of the sensor or the object the frequency of the back-scattered waves are doppler shifted. Doppler signal is deployed for speed measurement.

The forward speed of e.g. an indoor transportation vehicle, fork lift, conveyor belt, off-highway vehicle and rail applications is measured contactless thus unsusceptible to wheel / drive slip, effective tyre circum­ference and sinking in of the tyre. For demanding applications Speed Wedge MKII is sealed and potted in a rugged encasing.

Speed Wedge MKII is available in variants with pulse, serial RS232 and CAN-Bus output. High speed up to 200 km/h is available.

Speed Wedge MKII data sheet

Data sheet for MSO Speed Wedge MKII speed sensor


Speed Wedge MKII declaration of conformity

Declaration of conformity for Speed Wedge MKII


Speed Wedge MKII user manual

User manual for Speed Wedge MKII





  • Measure­ment of speed and distance travelled indepen­dent on wheel / drive slip
  • Commercial-off-the-shelf (COTS) solution
  • High dynamics and signal update rate
  • Easy installation in parallel to the object being measured
  • Unsusceptible against varying properties of the ground surface
  • Pulse Output according to DIN 9684 / ISO 11786 and serial RS232
  • Option: high speed up to 200km/h
  • Option: CAN-Bus interface
  • Detection of direction of movement (forward - backward)
  • Basis for precise output application e.g. spraying, fertilizer application, seeding requiring forward speed & distance travelled
  • dead reckoning system component for inertial measurement units IMS in GPS/GNSS-denied environments e.g. in-doors, tunnels, underground mining .....
  • assisting / augmenting GNSS with true-gound-speed
  • sensor fusion with GNSS and IMS improving positioning accuracy and quality in GNSS challenging environments
  • assistance / augmentation for in-door Real-Time Locating Systems (RTLS)
  • true-ground-speed - assistance for positioning and navigation in mobile IoT
  • tire slip and wear monitoring e.g. for mining dump trucks / haulers

Technical Data

Power supply +9 VDC to +28 VDC
Current consumption < 200 mA
Operating temperature -40 °C to +70 °C
Storage temperature -40 °C to +85 °C
Frequency and EIRP 24.15 to 24.25 GHz at 12.7 dBm EIRP
Output signal 130 Pulses / m (36,1 Hz km-1 h-1) acc. DIN 9684 / ISO 11786
and serial RS232 or CAN-Bus
Output signal update rate 20 Hz
Speed range 0.8 km/h to 200 km/h
Sensor Configuration One Radar Frontend
System Accuracy 0.1 % F.R.
Dimensions - less cable, with flaps 55 mm wide, 110 mm long, 45 mm heigh

overmolded DIN M12 male plug, connector options t.b.d., e.g. Deutsch, Wheather Pack, AMP Superseal

Vehicle Installation base plate parallel to the object being measured, unobstructed view to the surface



Electrical Safety
EN 62368-1:2014 + A11:2017, IEC 62368-1: 2014 + A11:2017, EN 60950-22:2017
EMC EN 301 489, EN 61326-1:2013

EN 62311 (MPE)


Directive 2011/65/EU, EN 50581:2012 (EN IEC 63000:2018)

RED EN 300 440, SRD (1GHz to 40 GHz) - Category 1
FCC (U.S.A.) FCC §15.249, Contains FCC ID: UXC-SMR-3X3, FCC ID: AXQCSWMKII-21, FCC 47 CFR Part 1
ISED (Canada) ISED RSS-210 Annex B.10, Contains IC ID: 6902A-SMR3X3, RSS-GEN/ICES-003, Class B

Environmental Protection

ISO 20653 : IP6KX, IPX7, IPX9K
ACMA (Australia) Letter of authorisation for RCM compliance mark & Supplier´s declaration of conformity from RCM responsible supplier number E304, ACN/ARBN 84156023504
Dry heat test (CENELEC) DIN EN 60068-2-2, DIN EN 50155
High temp. test (AREMA) MIL-STD810G
Low temp. test (CENELEC) DIN EN 60068-2-1, DIN EN 50155
Low temp. test (AREMA) MIL-STD810G
High temp. storage (AREMA) MIL-STD810G
Low temp. storage (AREMA) MIL-STD810G
Low temp. storage (CENELEC) DIN EN 60068-2-1, DIN EN 50155
Humidity / Damp heat (AREMA) MIL-STD810G
Humidity / Damp heat (CENELEC) DIN EN 60068-2-30, DIN EN 50155
Random vibration DIN EN 60068-2-64, DIN EN 61373
Mechanical shock DIN EN 60068-2-27, DIN EN 61373
Sine vibration (AREMA) MIL-STD810G
Resonance search (AREMA)


Mechanical shock (AREMA)