Brake Distance Measurement and Vehicle Speed Measurement System – ADMA-Speed
ADMA-Speed is a high-precision Brake Distance Measurement and Vehicle Speed Measurement System for vehicle testing applications. Combining GNSS technology with integrated inertial sensors, it delivers accurate speed, acceleration and braking distance data for brake testing, vehicle dynamics testing and ADAS validation.
All motion data is calculated using the proven ADMA technology. In its standard configuration, ADMA-Speed provides high-accuracy vehicle speed measurement, brake distance measurement and acceleration data via CAN and Ethernet interfaces. The system eliminates many of the known limitations of conventional GNSS speed sensors and ensures highly reliable results during vehicle testing.
Technical data for Inertial Navigation System ADMA-Speed can be found in the table below or in the data sheet.
Our systems are not subject to US export restrictions and can be used worldwide without the need for approval.
Highlights of our Brake Distance and Vehicle Speed Measurement System
Meets requirements of international test standards EURO NCAP and NHTSA
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GNSS speed sensor optimized for brake tests
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ADMA-Speed eliminates the known disadvantages of GNSS speed sensors
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Validation of driver assistance systems e.g. ACC, FCW, AEB (VRU, Car2Car), LSS (LDW, LKA)
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Chassis adjustment
Highlights of our Brake Distance Measurement System
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User-friendly handling thanks to the combination of GNSS antenna and inertial sensors in one housing
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Mounting by means of powerful magnets on the vehicle roof
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Pitch compensation during braking
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Considerably smoother speed signal in comparison to GNSS
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Compensation of GNSS data latency
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Correction of acceleration-dependent GNSS signal distortion
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Speed calculation at the vehicle center of gravity
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Data processing unit with tried and tested Kalman filter technology
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Output of acceleration, speed and braking distance via CAN interface in real-time (up to 1 kHz)
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Signal inputs for braking trigger or light barrier
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Speed and signal-triggered braking distance
Options and accessories for the Inertial Navigation System ADMA-Speed
Optionally, ADMA-Speed can be expanded to a full-fledged Inertial Navigation System, e.g. for vehicle dynamics testing or verification of ADAS systems (Advanced driver assistance systems).
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Output of lateral deviation
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Output of all motion states (acceleration, velocity, position, angular rate, angle)
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2 antenna version for course angle without initialization
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2 cm position accuracy
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Data output rate 1 kHz
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Relative data calculation (e.g. range) via WiFi in real-time for multi-vehicle operation
Brake Distance Measurement for Vehicle Testing
ADMA-Speed is specifically designed for highly accurate brake distance measurement and vehicle speed measurement during automotive testing. The combination of GNSS and inertial sensors provides reliable results even under challenging test conditions. Typical applications include brake testing, vehicle dynamics testing, ADAS validation and performance verification of modern driver assistance systems.
Technical data of the Inertial Navigation System ADMA-Speed
ADMA-Speed
| COMPLETE SYSTEM | |
| GNSS constellations | GPS L1, L2 GLONASS L1, L2 BeiDou*1 B1, B2 Galileo*1 E1, E5 |
| Dual antenna | Optional |
| Position accuracy (1σ)*2 | 0.01 / 0.20 / 0.60 / 1.20 / 1.50 m |
| Angle Measurement range roll / pitch / yaw | 60 ° / 60 ° / ± 180 ° |
| Angle Measurement accuracy roll & pitch (1 σ) / yaw (1 σ) / sideslip (RMS) | 0.02 / 0.05 / 0.15 ° |
| Angle resolution | 0.005 ° |
| Velocity accuracy (RMS)*3 | 0.04 km/h |
| Position error after 10 / 30 / 60 sec GNSS outage (RMS)*3 | 0.4 / 5.0 / 40.0 m |
| Velocity error after 10 / 30 / 60 sec GNSS outage (RMS)*3 | 0.06 / 0.5 / 1.5 m/sec |
| Roll / Pitch angle error after 10 / 30 / 60 sec GNSS outage (RMS)*3 | 0.05 / 0.15 / 0.30 ° |
| Heading angle error after 10 / 30 / 60 sec GNSS outage (RMS)*3 | 0.05 / 0.15 / 0.30 ° |
| Braking distance accuracy without RTK2 (RMS)*3 | 0.05 m |
| Data output rate | 50 / 100 / 200 / 250 / 500 Hz / (1000 Hz)*1 |
| Calculation latency | 1 msec |
| – | |
| SENSORS – GYROS | |
| Sensor Technology | 3 MEMS gyros |
| Measurement range | ± 450 °/s |
| Data output resolution | 0.0001 °/s |
| Bias repeatability typ. (1 σ) | 0.2 °/s |
| In-run-bias typ. | 6 °/h |
| Noise (random walk) typ. | 0.3 °/√h |
| Scale factor | 0.2 % |
| Sensor bandwidth | 330 Hz |
| – | |
| SENSORS – ACCELEROMETERS | |
| Sensor Technology | 3 MEMS accelerometers |
| Measurement range | ± 5 g / ± 15 g*1 |
| Data output Resolution | 0.0001 g / 0.0001 g |
| Bias repeatability typ. | 4 mg / 16 mg |
| In-run-bias typ. (1 σ) | 32 µg / 70 µg |
| Noise (random walk) typ. | 50 µg /√Hz / 63 µg /√Hz |
| Scale factor (1 σ) | 0.2% / 0.2 % |
| Sensor bandwidth | 330 Hz / 330 Hz |
| – | |
| INTERFACES | |
| Ethernet | 2x 1 GBit Data input/output, configuration and firmware update, driving robot data output, optional for relative data calculation and DGNSS routing. 1x 100 MBit GNSS Receiver; GNSS firmware update |
| CAN | 1x CAN 2b, 1 Mbit Data output, input*1 |
| Serial | 1x RS232 GNSS Receiver; DGNSS correction data input 1x RS232 GNSS Receiver; GPGGA Log output, IPS (Indoor Positioning System) |
| Digital/Analog Input | 3x Digital / Analog (16 bit) e.g. Frequency, Brake trigger, … |
| Digital Output | 4x Digital TTL e.g. PPS, Frequency, PPD Pulse per distance, … |
| Connector type | Lemo & Sub-D |
| GNSS | 2x TNC GNSS Antenna connectors |
| – | |
| HARDWARE/MISCELLANEOUS | |
| Ordering Variants | – |
| Internal Memory | up to 64 GB |
| Power supply | 9 to 32 VDC typ. 20 W |
| Dimensions (W x L x H) | Data processing unit 225 x 235 x 75 mm Sensor unit 110 x 130 x 70 mm (with magnets) 87 x 130 x 60 mm (without magnets) |
| Weight | Data processing unit 2.3 kg Sensor unit 0.75 kg |
| Operating temperature | Data processing unit -20 to +60 °C Sensor unit -40 to +85 °C |
| Protection class | Data processing unit IP 50 Sensor unit IP 67 |
*2 Depending on GNSS conditions, correction data and license model
*3 Typical values according to internal test standards with settled Kalman filter.
