HomeADMA GNSS/­InertialsystemADMA-Speed: Speed and Braking Distance Sensor

ADMA-Speed: Precise Speed and Braking Distance Sensor

ADMA-Speed is a GNSS speed sensor with integrated inertial sensors. It is optimized for brake tests. For easy installation, the inertial sensors are integrated in the GNSS antenna.

All motion data of the vehicle is calculated by means of the tried and tested ADMA technology. In the basic version acceleration, speed and braking distance is transmitted via the CAN and Ethernet interface. ADMA-Speed eliminates the known disadvantages of GNSS speed sensors.

Technical data for ADMA-Slim can be found in the tables below or in the data sheet.

At a glance

GNSS speed sensor optimized for brake tests
ADMA-Speed eliminates the known disadvantages of GNSS speed sensors
ADMA-Speed can be expanded to a full-fledged GNSS-aided inertial system
Validation of driver assistance systems e.g. ACC, FCW, AEB (VRU, Car2Car), LSS (LDW, LKA) Chassis adjustment

ADMA-Speed highlights

  • User-friendly handling thanks to the combination of GNSS antenna and inertial sensors in one housing
  • Mounting by means of powerful magnets on the vehicle roof
  • Pitch compensation during braking
  • Considerably smoother speed signal in comparison to GNSS
  • Compensation of GNSS data latency
  • Correction of acceleration-dependent GNSS signal distortion
  • Speed calculation at the vehicle center of gravity
  • Data processing unit with tried and tested Kalman filter technology
  • Output of acceleration, speed and braking distance via CAN interface in real-time (up to 1 kHz)
  • Speed and signal-triggered braking distance
  • Signal inputs for braking trigger or light barrier
ADMA-Speed evaluation unit / ADMA-Speed-ANT sensor unit

Options and accessories

Optionally, ADMA-Speed can be expanded to a full-fledged GNSS-aided inertial system, e.g. for vehicle dynamics testing or verification of ADAS systems.

  • Output of lateral deviation
  • Output of all motion states (acceleration, velocity, position, angular rate, angle)
  • 2 antenna version for course angle without initialization
  • 2 cm position accuracy
  • Data output rate 1 kHz
  • Relative data calculation (e.g. range) via WiFi in real-time for multi-vehicle operation

Technical data

Position accuracy0.01 / 0.2 / 0.4 / 0.6 / 1.2 / 1.5 m (depending on license model and DGPS corrections)
Data update rateup to 50 msec (internally interpolated from 20 to 2.5 msec,
optionally 1 msec)
WAAS / EGNOS-DGPS correctionvia satellite
DGNSS correctionvia NTRIP / RF modem
RTK2-DGPSvia NTRIP / RF modem (optional)
Satellite trackingGPS single antenna (standard)
GLONASS / Galileo / BeiDou / L-Bandoptional
Dual antenna versionoptional
Angle measuring range heading/roll/pitch± 180 / 60 / 60°
Angle measuring accuracy roll & pitch / heading / slip0.02 (1σ) / 0.05 (1σ) / 0.15° RMS
Angle resolution0.005°
Velocity accuracy*0.04 km/h RMS
Lateral velocity*0.2 % RMS
GNSS outage position error*after 10 / 30 / 60 sec: 0.4 / 5.0 / 40.0 m RMS
GNSS outage velocity error*after 10 / 30 / 60 sec: 0.06 / 0.5 / 1.8 m/sec RMS
GNSS outage pitch / roll angle error*after 10 / 30 / 60 sec: 0.05 / 0.15 / 0.35 ° RMS
GNSS outage heading angle error*after 10 / 30 / 60 sec: 0.1 / 0.3 / 0.5 ° RMS
Data update rate / calculation latency50 – 400 Hz (up to 1000 Hz optional) / 1 ms
Stopping distance accuracy*5 cm RMS
Ethernet 11 Gbit, for data output, configuration and firmware update
Ethernet 21 Gbit, for driving robot, output
Ethernet 31 Gbit, optional for relative data calculation (e.g. range) and DGPS routing, input/output
CANCAN 2b, 1 Mbit, for data output
Signal inputs3 TTL, galvanically isolated (e.g. for light barrier or brake trigger)
Signal output4 TTL, galvanically isolated (e.g. for synchronization and error indication)
GNSS antenna input1, optional 2
IMU Eingang1 (ADMA components only)
DGNSS correction data input1 (NTRIP/RF modem interface)
Initial alignmentwith internal GPS receiver
Power supply12 VDC nominal (9-32 VDC), 18 Watt typ. with ADMA-Speed-Ant, without other devices
Dimensions (W x L x H)225 x 235 x 75 mm
Weight2.3 kg
Protection classIP 50 (IP 65 on request)
Temperature range (operational)-20 to +60° C
* typical values according to internal test standards with settled Kalman filter without use of RTK
Quantity / Type3 MEMS gyros
Measurement range± 450 °/s
Resolution3 x 10-7 °/s
Bias temperature drift typically± 0.0025 °/s / °C (1σ)
In-run-bias typically6 °/h (1σ)
Gyro noise typically0.4 °/√h
Scale factor±1 %
Sensor bandwidth330 Hz
Quantity / Type3 MEMS accelerometers
Measurement range± 5 g, optional ± 10 g
Measurement accuracybetter than 5 mg (without Kalman filter corrections)
In-run-bias typically32 μg (1σ)
Measurement resolution12.2 ng
Sensor bandwidth330 Hz
ADMA-Speed-Ant-GG1 (standard)GPS L1, GLONASS L1, GALILEO E1/E2/L6, Compass B1, IRNSS L1, L-Band
ADMA-Speed-Ant-GG2 (optional)GPS L1/L2/L5, GLONASS L1/L2, GALILEO E1/E2/E5/E5a/E5b/E6/L6, Compass B1/B3, IRNSS L1/L5, L-Band
Dimensions (B x T x H)110 x 130 x 70 mm (with magnets), 87 x 130 x 60 mm (without magnets)
Weight0.75 kg
Protection classIP 67
Temperature range-40 to +85 °C
* typical values according to internal test standards with settled Kalman filter without use of RTK