DEWESOFT V21-1 Product manual
DS-VGPS-HSC
TECHNICAL REFERENCE MANUAL
DS-VGPS-HSC V21-1
1
DS-VGPS-HSC
TECHNICAL REFERENCE MANUAL
1. Table of contents
1. Table of contents 2
2. About this document 4
2.1. Legend 4
3. GPS based system for position, speed, and displacement measurement 5
3.1 Features 5
3.1.1 Speed sensor 5
3.1.2 Clock output 5
3.2. Specifications 5
3.3. Device overview 7
3.4. Functionality of the LEDs 8
3.4.1. Power (green) 8
3.4.2. Status (red) 8
3.5. Mounting the aerial 8
3.6. Warm-Up time 9
4. Scope of supply 10
5. Connection 11
5.1. Connector overview 11
5.1.1. Aerial connector 11
5.1.2. MULTI I/O connector (DSUB-9 female) 12
5.1.3. USB connector 12
5.1.4. VGPS – Display connector 13
5.1.5. Mark input connector 13
5.1.6. Power supply connector 13
5.1.7. Sync connector 14
5.1.8. Cable for external power supply 14
5.1.9. Cable for connecting VGPS to VGPS-Display (optional) 15
5.1.10. Cable for connecting VGPS to CAN 16
5.1.11. Output cable velocity and distance 17
5.2. Options 17
5.2.1. Brake trigger switch 17
5.2.2. Digital display 18
6. Installation of the DewesoftX® measurement software 20
6.1 Connecting the DS-VGPS-HSC to the DAQ-System 20
6.1.1. Synchronization to system with Clock and Trigger 20
6.2. Configuration of DewesoftX® for the DS-VGPS-HSC 20
6.2.1. Timing settings 23
6.3. Channel setup 25
6.4. Measurement 26
6.5. Analysis 27
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7. Warranty information 28
7.1. Calibration 28
7.2. Support 28
7.3. Service/repair 28
7.4. Restricted Rights 28
7.5. Printing History 28
7.6. Copyright 29
7.7. Trademarks 29
8. Safety instructions 30
8.1. Safety symbols in the manual 30
8.2. General Safety Instructions 30
8.2.1. Environmental Considerations 30
8.2.2. Product End-of-Life Handling 30
8.2.3. System and Components Recycling 30
8.2.4. General safety and hazard warnings for all Dewesoft systems 31
9. Documentation version history 34
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TECHNICAL REFERENCE MANUAL
2. About this document
2.1. Legend
The following symbols and formats will be used throughout the document.
Important
It gives you important information about the subject.
Please read carefully!
Hint
It gives you a hint or provides additional information about a subject.
Example
Gives you an example of a specific subject.
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DS-VGPS-HSC
TECHNICAL REFERENCE MANUAL
3. GPS based system for position, speed, and
displacement measurement
3.1 Features
●Synchronized data acquisition combined with real time speed measurement
●Portable and rugged construction
●Insensitivity to road surface (can be used on mud offroad, water, snow, ice,..)
●Mark input for brake trigger switch
3.1.1 Speed sensor
●100 Hz update rate for speed and distance output
●Supports USB and CAN interface
●Supports differential GPS (SBAS) as standard function
●Online signal quality monitoring for standalone applications
●No calibration required
3.1.2 Clock output
●Output clock rate of up to 10 MHz
●One independent output frequency
●PPS accuracy of 100 ns
●Continuous synchronization to absolute GPS time
●Absolute long time stable
3.2. Specifications
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DS-VGPS-HS/HSC
NAVIGATION
Standalone (horizontal positioning)
1.2 m
Standalone (vertical positioning)
1.8 m
SBAS (horizontal positioning)
0.8 m (WAAS, EGNOS 0.3 m)
SBAS (vertical positioning)
1.2 m (WAAS, EGNOS 0.5 m)
Omnistar (horizontal positioning) *
-
Omnistar (vertical positioning) *
-
RTK (horizontal positioning) *
0.02 m
RTK (vertical positioning) *
0.02 m
Velocity accuracy
0.02 m/s
Roll & Pitch accuracy (dynamic)
-
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TECHNICAL REFERENCE MANUAL
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Heading accuracy (dynamic with GNSS)
-
Slip angle accuracy
-
Range
Unlimited
Hot start time
< 10 s
Output data rate
20/100 Hz
GNSS
Supported navigation systems
GPS L1, L2* GLONASS L1, L2*
Supported SBAS systems
WAAS, EGNOS, MSAS, GAGAN, QZSS
ADDITIONAL FEATURES
PPS output
✓
IRIG B DC output
-
Dual antenna heading
-
RTK positioning
✓
HARDWARE
Interface
RS232 / USB, CAN, Analog, Digital
Operating voltage
9 to 36 V
Power consumption
250 mA @ 12 V
Operating temperatures
0 °C to 60 °C
Environmental protection
not IP rated
Input protection
Polarity & short overvoltage protection
Shock limit
MIL-STD 810 F
Dimensions
115 x 93 x 35 mm
Weight
740 g
INERTIAL SENSORS
Accelerometer
-
Gyroscope
-
Magnetometer
-
Pressure sensor
-
APPLICATIONS
Synchronisation and timing with DewesoftX®
DAQ
✓
Simple positioning
✓
Brake/Acceleration test
✓
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TECHNICAL REFERENCE MANUAL
3.3. Device overview
The DS-VGPS-HSC offers a unique combination of a high dynamic GPS based speed sensor and a GPS
synchronized time base generator. This combination allows completely synchronized data acquisition of
multiple systems located inside and outside of moving vehicles.
The sensitivity of the analog speed and displacement output is free programmable. Due to the 100 Hz
update rate the latency time is as low as 9 ms. Using the unique PPS sync technology the latency time
of the digital interfaces (USB or CAN) are corrected online.
Image 1: VGPS HSC inputs and outputs
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Vehicle dynamics
-
Lane change
✓
Circle drive
✓
Chassis development
-
Advanced driver assistance systems testing
✓
Comfort testing
-
Pass by Noise
✓
FuSi
✓
Orientation of different object
-
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TECHNICAL REFERENCE MANUAL
The base of any GPS receiver is precise time measurement. In addition to the position information a
precise PPS (pulse per second) is generated by the GPS engine. This pulse is used to synchronize 80
MHz oscillators with software PLL (phase locked loop). The result is an ultra stable 80 MHz clock source
which is completely free of drift over time.
The communication to the host is provided over CAN or standard USB interface.
3.4. Functionality of the LEDs
3.4.1. Power (green)
The power LED is solid green when the DS-VGPS-HSC is in normal operation.
3.4.2. Status (red)
3.5. Mounting the aerial
The aerial supplied with the VGPS is designed to be mounted magnetically on top of the vehicle in a
horizontal plane. If the surface is not metallic, the aerial may be fixed by placing a piece of strong tape
over the top of the aerial. The positioning of the aerial is critical to the correct operation of the VGPS.
Note: For correct operation, the aerial requires a metallic subsurface with a minimal diameter of 15 cm.
This surface doesn’t have to be ferromagnetic.
The aerial picks up the signals from up to 12 satellites which are all in different places in the sky. These
satellites are not necessarily directly overhead, and can often be close to the horizon. Therefore it is best
to mount the aerial in a way that the least amount of metal obscures the view of the sky. On a domed
roof, place the aerial on the top of the dome. On an open car with a roll-over bar, place the aerial
horizontally on the highest point of the roll-over hoop and tape the wire securely to the frame. Although
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The red status LED indicates current status of
device:
At normal operation - when DS-VGPS-HSC is
locked to the selected time source - it shortly
blinks once a second.
Image 2: LED Normal Operation
When the time source signal is missing (neither
GPS or IRIG time code signal), the device
automatically goes to flying-wheel operation. This
is indicated by inverted blinking.
Image 3: LED Missing Signal
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TECHNICAL REFERENCE MANUAL
the VGPS can work with at least three satellites, it's precision increases the more satellites it finds. If one
satellite disappears over the horizon, or behind an object, there are other satellites still in view.
Image 4: GPS antenna
3.6. Warm-Up time
When the VGPS is used for the first time, has been moved more than 200 km or not used for 10 hours
(since last usage), it is recommended to perform a ‘cold start’. To get the best performance from your
VGPS in the future, perform this cold start in an open place with a good all round view to the sky. Allow
the VGPS to map the satellites for at least 20 to 30 minutes. The VGPS builds up the ‘Ephemeris’ data on
each satellite which is stored in a non-volatile memory, and means future satellite tracking is swift and
stable. Once the VGPS has carried out a successful cold start, future satellite lock from power up will
take between 15 seconds and 1 minute. Before going to test in a shady environment with tall objects or
near to trees, allow the VGPS to settle in an open space for 5 to 10 minutes.
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4. Scope of supply
Image 5: Connections
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5. Connection
5.1. Connector overview
Image 6: Inputs
5.1.1. Aerial connector
Connect the GPS aerial to the SMA connector.
Image 7: SMA connector
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TECHNICAL REFERENCE MANUAL
5.1.2. MULTI I/O connector (DSUB-9 female)
5.1.3. USB connector
The Mini-USB interface connectors meet standard USB pin assignment.
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Image 8: MULTI I/O connector (DSUB-9 female)
Pin
Description
1
+5V 50mA supply
2
CAN-LOW
3
Scan clock out
4
Distance out
5
Analog speed output
6
PPS (pulse per
second)
7
CAN-HIGH 8: DGND
(Ground)
8
AGND (Analog speed
ground)
9
TEDS
Image 9: USB mini connector
Pin
Description
1
+5V
2
Data
3
Data +
4
Host cable identification
5
GND
DS-VGPS-HSC
TECHNICAL REFERENCE MANUAL
5.1.4. VGPS – Display connector
To connect the external display to the DS-VGPS-HSC system.
5.1.5. Mark input connector
Connects an external trigger source to the DS-VGPS-HSC system.
5.1.6. Power supply connector
Connects the DS-VGPS-HS system to an external DC power supply.
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Image 10: VGPS display connector
EXG.1B.304.HLN
Pin
Description
1
+5V
2
GND
3
TXD
4
RXD
Image 11: Mark input connector: pin-out (3-pin
LEMO female)
EXG-1B.303.HLN
Pin
Description
1
+9 to +36 VDC power supply
2
GND power supply
3
Signal
Image 12: Power supply connector (2-pin LEMO male)
EXJ.1B.302.HLD
Pin
Description
1
+9 to +36 VDC power supply
2
GND power supply
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TECHNICAL REFERENCE MANUAL
5.1.7. Sync connector
5.1.8. Cable for external power supply
Type of cable: LIYY 2x0.75, length: 2 m
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Image 13: Sync connector: pin-out (4-pin LEMO female)
Interface connector: EEG.00.304.CLL
Mating connector: FGG.00.304.CLAD27Z
Pin
Name
Description
1
CLK
Clock
2
Trigg
Trigger
3
GPS-PPS
GPS - PPS
4
DGND
Digital Ground
Standard:
(included)
Optional:
Optional:
Image 14: Cables for power supply
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TECHNICAL REFERENCE MANUAL
Optional: AC adapter
●different AC cable (depends on the country)
Image 15: AC adapter
5.1.9. Cable for connecting VGPS to VGPS-Display (optional)
Type of cable: LIYCY 4x0.25 shielded, length: 2 m
Image 16: VGPS display cable
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5.1.10. Cable for connecting VGPS to CAN
Type of cable: LIYCY 2x0.25 shielded, length: 2 m
Image 19: VGPS to CAN cable
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Image 17: FGJ.1B.304.CLAD52Z
Image 18: FGJ.1B.304.CLLD52Z
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TECHNICAL REFERENCE MANUAL
5.1.11. Output cable velocity and distance
Type of cable: RG-174, length: 2 m
Image 20: DSUB9 to 2xBNC cable
5.2. Options
5.2.1. Brake trigger switch
(Available to purchase as an option)
The brake trigger is designed to be mounted on the brake pedal or the accelerator pedal and gives an
indication when the pedal is pressed. The normal method of fixing is via rubber bands. The brake trigger
can be used during a brake stop to determine the speed at which the brake pedal was pressed, and the
braking distance from this point can be viewed. This switch can be connected directly to an input of the
data acquisition system or to the DS-VGPS-HSC. The DS-VGPS-HSC will recognize the exact time of the
switching point. A serial command with this time information will be transmitted to the data acquisition
unit. DewesoftX® displays this event as a separate channel. This channel can be used during post
processing to calculate the brake distance.
Image 21: Brake trigger switch
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5.2.2. Digital display
The LED display is used to monitor various GPS parameters.
Display description:
Blinking middle dashes on all digits - the display is unable to communicate with the VGPS. Pressing and
releasing the push-button on the front of the VGPS-Display switches the display to different modes.
After pressing the push-button, the LED bedside mode changed to appropriate display mode.
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Mode 01:
Number of satellites and velocity in
mph.
Mode 02:
Number of satellites and velocity in
kph.
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TECHNICAL REFERENCE MANUAL
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Mode 03:
GPS UTC time reported by the
satellites goes up in increments of
0.05 seconds. The format is
hh.mm.ss. The base for the time is
Universal Time Coordinate, derived
from the atomic clocks on board
the satellite and hence is extremely
accurate.
Mode 04:
Heading in degrees. Number of
satellites and heading of the
vehicle relative to true North.
Resolution: 0.1 degree
Mode 05:
Number of satellites and height
relative to the Datum WGS84
(approx. 50 meters below UK sea
level). Resolution: 0.1 meters
DS-VGPS-HSC
TECHNICAL REFERENCE MANUAL
6. Installation of the DewesoftX® measurement
software
For optimal operation, we recommend that you install the latest version of DewesoftX® . If you already
have DewesoftX® installed, please check if a newer version is already available. You can either check on
the website under Support/Downloads/DewesoftX section or directly in software under the
Options/Check for updates. In both cases the changelog is included
Image 22: Check for updates
6.1 Connecting the DS-VGPS-HSC to the DAQ-System
6.1.1. Synchronization to system with Clock and Trigger
To synchronize standard data acquisition systems a start trigger and the possibility of external clocking
is required. This input needs to be connected to the output of the DS-CLOCK sync signals of the 9-pin
DSUB female (signal Scan Clock Output and PPS).
6.2. Configuration of DewesoftX® for the DS-VGPS-HSC
●Start DewesoftX®
●To unlock the GPS functionality in DewesoftX® the GPS has to be configured in the Hardware
Setup screen (Settings → Hardware Setup)
●In the hardware setup window select 'GPS' and follow the instructions below:
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