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, UGVs unmanned ground vehicles and rail applications is measured contactless thus unsusceptible to wheel/traction slip and slide, effective tire/wheel circum­ference and sinking in of the tire. For demanding applications in harsh environments 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 here and further details on request.

Speed Wedge MKII declaration of conformity

Declaration of conformity for Speed Wedge MKII


Speed Wedge MKII user manual

User manual for Speed Wedge MKII



Application Benefits

  • Contactless untethered measure­ment of true-ground speed and distance travelled (odometry).
  • Regardless of wheel/traction slip and slide.
  • Regardless of actual wheel/tire circumference affected by e.g. wear, varying tire inflation pressure, sticky material building up.
  • Regardless of sinking in of tires/tracs on soft ground.
  • Commercial-off-the-shelf (COTS) solution.
  • One solution for all types of vehicles in diverse fleets.
  • Favorable total cost of ownership compared to case-by-case retrofit of diverse existing fleets speed measure­ment solution e.g. CAN OBD, RPM sensors, Gearbox sensors ....
  • OEM-agnostic solution.
  • High dynamics and signal update rate.
  • True speed over ground for traction, slip and breaking monitoring and control.
  • Easy installation in parallel or perpen­dicular to the object/surface being measured.
  • Unsusceptible against varying properties of the ground surface.
  • Pulse output according to DIN 9684/ISO 11786 and serial RS232.
  • Option: CAN-Bus interface.
  • Speed range from below 0.8 km/h up to high speed of 200 km/h.
  • Situational awareness : detection of stop and direction of movement (forward - backward).
  • Basis for precise output application e.g. spraying, fertilizer application, seeding requiring forward speed & distance travelled.
  • Applicable as a dead reckoning system component for inertial measure­ment units IMS in GPS/GNSS-denied/constricted environ­ments e.g. in-doors, tunnels, (underground) mining .....
  • Assisting/augmenting GNSS with independent true-gound-speed in case of spoofing/jamming.
  • Sensor fusion with GNSS and IMS improving positioning accuracy, quality and reliability.
  • Assistance/augmentation for in-door Real-Time Locating Systems (RTLS.)
  • Improving safety, integrity and confidence in autonomous & safety solutions on and off the road, in buildings/warehouses, in underground mining ...
  • Independent true-ground-speed-backing for GNSS INS, positioning and navigation in mobile IoT.
  • Integration in INS for improved immunity against GNSS jamming and spoofing attacks.
  • Tire/wheel/traction slip & slide monitoring and closed loop control for vehicles.
  • Tire/wheel/traction wear monitoring comparing to wheel ticks e.g. for mining dump trucks/haulers, rail waggons/locomotives.
  • GNSS Spoofing Detection/Indication if the GNSS platform´s actual speed does not agree with Radar true-ground speed.

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 0.5 % 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)