Innovative GPS and RFID technology
SGDR GPS or GNSS Dead Reckoning Device
Key features
• Can be built with
either Trimble Aardvark
DR+GPS or Bison
DR+GNSS modules.
• Instantaneous and
accurate positions in
deep urban canyons and
dense forests.
• Continuous position
outputs in tunnels,
parking garages and in
undercover areas.
• Reliable positioning
for tracking high-value
assets and for mapping
applications.
• Improves QoS and
customer satisfaction
and retention via
maximised service
revenue.
• Automotive grade voltage
regulator, 9 to 32Vdc
input with reverse polarity
protection.
• RS-232 serial interface
• Signal conditioned
odometer and direction
inputs for direct wiring.
• Optional CanBus module
for OBD-II connection.
• Provides DR data with
5Hz update frequency.
10Hz option available
with Aardvark, 20Hz
option available with
Bison.
• Bison module is Galileo
and QZSS ready.
When you need more than GPS
The Step Global SGDR device is a customisable platform that
combines Dead Reckoning (DR) with either GPS or GPS and GLONASS
to produce accurate and instantaneous positions, even under the
most difficult conditions. For service providers tracking high value or
perishable cargo, the SGDR device dramatically improves quality
of service.
When GPS signals are lost or severely degraded, dead reckoning
estimates its position based on heading and distance travelled since
the last known GPS position. The heading information is derived from
an on-board gyro and the distance travelled is taken from the vehicle
odometer signal.
However, it is critical for a dead reckoning system to have accurate
speed, time and heading inputs, and the raw vehicle and gyro inputs
must be continuously calibrated to achieve this. This is where GPS
helps.
GPS continuously calibrates the gyro and speed sensors to produce
optimal dead reckoning. The SGDR has an on-board gyro sensor and
accepts inputs from an odometer pulse and a forward/reverse indicator.
Its sophisticated algorithms auto calibrates these sensors and optimally
blends the sensor inputs and GPS to produce accurate position and
velocity outputs in the most challenging environments.
The SGDR contains a three-axis gyro and sophisticated algorithms to
self-calibrate. This allows the module to be mounted in any orientation
on your vehicle and still output the highest quality position and velocity
measurements.
SGDR Overview
• DR positioning solution with integrated GPS or
GNSS receiver
• Supports both NMEA and HIPPO protocols
• Automatic calibration of gyro and external
sensor inputs
Protocols
• Configurable NMEA or HIPPO
• NMEA Messages GGA, VTG, GSA, GSV,
ZDA and RMC. Supports proprietary NMEA
messages
• Serial is either 115.2k (Bison) or 38,400
(Aardvark) Baud, 8 data bits, no parity,
1 stop bit
GPS Antenna
• 3.3V active antenna
• SMA Female connector
PIN
Description
DR+GPS or GNSS Module
The SGDR contains either a GPS (Aardvark)
or GNSS (Bison) receiver, a sophisticated DR
processor and gyro sensor. The DR processor
processes the inputs from the gyro, speed pulse
and reverse indicator to calculate its position when
GPS signals are lost.
Performance Characteristics
Aardvark position update rate........5Hz (10Hz Opt)
Bison position update rate..............5Hz (20Hz Opt)
Horizontal accuracy.......................GPS 2m, DR 5m
Altitude accuracy.......................................... DR 5m
Velocity accuracy............................ 0.5% of Speed
Heading accuracy................................ < 2 degrees
PPS............................................................... ± 25ns
Aardvark TTFF (calibrated).................................. 2s
Bison TTFF (calibrated).................................... < 1s
Operating temperature......................-40ºC to 85ºC
Storage temperature.....................-40ºC to +105ºC
Antenna connector...........................................SMA
PIN
Description
1
Vcc (9 to 32 Vdc)
6
PPS Out (TTL Level)
2
TX Data Out (RS 232 Level)
7
Reverse Signal In (6 to 30 V)
3
RX Data In (RS 232 Level)
8
Ground
4
Speed Pulse Input (6 to 30 V) 0 to 3 khz,
distance of 1 cm to 1 m per pulse
9
Backup Power In (6 to 30 Vdc)
5
Ground
Installation Notes
1. The unit must be mounted securely within
the vehicle
Before the receiver is calibrated, it operates in
GPS-only mode. After calibration, the receiver
will operate in DR mode. The calibration
procedure is outlined in the Aardvark DR
reference manual.
2. The Aardvark-50 or Bison module used
in the SGDR has a three-axis gyro and a
sophisticated calibration algorithm that allows
you to mount the module in any orientation
relative to the vehicle e.g. mounted flat, tilted
at an angle, upside-down, or on its side.
4. Backup power should come from the host
system battery backup. It will enable the
Aardvark DR to retain its settings during Vcc
disconnect.
3. You must calibrate the Aardvark or Bison
receiver after installation to ensure an accurate
output from the receiver. The calibration will
measure some of the characteristics that
are specific to the vehicle installation, and
are done automatically when the unit is first
installed.
5. If speed and reverse signals are to be
obtained via the vehicles OBD-II connector
then the optional CanBus module will need
to be supplied. The CanBus module can be
configured for a wide range of vehicles to
provide speed, reverse, ignition, vehicle power
and ground.
Product Code
SGDR+GNSS-001
SGDR-003
Description
SGDR Device with Bison GNSS module
SGDR Device with Aardvark GPS module
email:[email protected]
Phone: +61 3 9551 7334
Fax:
+61 3 9551 7919
Unit 7, 444 Warrigal Road, Heatherton, Victoria Australia 3202
www.stepglobal.com