GNSS Test for Automotive Industry and beyond

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GNSS TestforAutomotive Industryand beyond

• darren.fisher_at_spirent.com

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Spirents Unique Position within the GNSS
Community

• Worlds Leading GPS/GNSS Test Solution Provider
• 23 year legacy of design effort as Global Leaders
  in the GPS Simulation field
• Worlds only commercial GLONASS Simulator
• Delivered Galileo Simulators as ESA Supplier of
  choice to all official Galileo development
  programs.

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A Few Spirent Customers
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GPS is simple isnt it?

• Q. Can I buy a GPS chip and expect it to just
  work in my device?
• A. Yes, but.
• Need to test in your device, with tests and
  specifications designed for your application.
• GPS test is needed at every stage of design and
  manufacture process.
• Traceability important for your suppliers and
  customers.
• Cost of failure is high.
• There is a lot to consider when developing a GPS
  device

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Expansion of key signals

• 2007
• GPS L1 C/A and P
• GPS L2 P
• GLONASS L1
• WAAS

• 2012
• GPS L1 C/A, P, C
• GPS L2 C, P
• GPS L5
• GLONASS L1, L2
• Galileo L1, E5ab, E6
• Open Service
• Commercial Service
• Safety of Life
• Public Regulated Service
• Compass
• QZSS
• EGNOS
• WAAS
• MSAS

• Augmentation
• IVNS
• Inertial Sensors
• A-GPS
• LAAS
• Pseudolite
• WiFi triangulation
• Wireless Basestation Triangulation
• DGPS

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In Vehicle NavigationSystems (IVNS)
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IVNS Applications
Many services and Users require high accuracy,
rapid first fix and guaranteed position despite
tunnels and urban canyons to unlock demand.

• Route planning
• Congestion avoidance
• Traffic flow management
• Theft Recovery
• Local service finder
• Automatic Vehicle Location
• Road User Charging
• Speed limiter
• Emission control
• Fleet Management
• Advanced Driver Assistance Systems (ADAS)
• Pay as you drive Insurance
• Insurance premiums set by driving style

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Automotive Industry

• Demanding User
• 100 availability
• High accuracy
• Fast Fix
• Poor availability, difficulty to re-acquire
• Inaccuracies of several hundred metres common in
  severe environments
• Potentially poor continuity
• Multipath problems
• Choice of Handheld PND or Integrated devices
  available

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In Vehicle Navigation System

• Hybrid systems combine the great accuracy of GPS
  with the dependability of low cost DR sensors.

E
S
Continuous position data from sensors allows
system to paint through gaps in GPS coverage
Constant position updates via GPS enables the
calibration of low cost Dead Reckoning sensors
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IVNS Testing Challenges

• Synchronised generation of all sensor outputs
• RF signal corruption consistent with chosen
  environment
• Repeatable, controllable, meaningful, accurate
• Vehicle motion model which adequately matches
  target vehicle dynamics
• Availability of accurate truth data

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IVNS Test Parameters

• Typical Parametric Figures of Merit
• Sensitivity Ability to reliably track low-power
  signals
• Carrier-to-Noise ratio A measure of how well
  the receiver has correlated with the coded signal
• Dynamic tracking Ability to maintain signal
  tracking as the users platform rapidly moves or
  changes orientation
• Time-to-First-Fix (TTFF) How long after a cold
  or warm start does it take to obtain the first
  position solution?
• Re-acquisition time (REAC) How long does it
  take the receiver to track a signal again after
  the signal has been obscured for a given
  period?
• Accuracy Compared to truth in ideal conditions

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How can I answer these questions

• A development tool that
• Provides all available SIS and Augmentation
  services
• Lacks ambiguity
• Gives me a High degree of control
• Has Inherent repeatability to see my improvements
  perform
• Great flexibility to allow for global testing
• Allows me to stress my product/application in a
  controlled environment where I can put the errors
  in
• Allows me to be fully aware of the complete test
  environment, and control it.

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My own Satellite Navigation System
Your GNSS system, under your control, for your
specifics test needs
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Why Simulate?

• If a fully operational constellation exists
  (GPS/GLONASS)
• You have no control over it
• It is always changing
• There are many, unknown errors
• It is never repeatable
• Atmospheric conditions change
• Satellite orbits change
• High cost of field test
• Or if no constellation exists (Galileo)
• A lack of real signals prevents testing
• Evaluation limited to software modelling only
• No confidence in the system performance of a
  receiver
• No way of conducting dynamic testing

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Application Areas

• Civil Aviation
• Commercial Aviation, light aircraft
• Space
• LEO (space station, shuttle), GEO (Satellite TV,
  WAAS, Communications), HEO, polar (Experimental,
  deployment)
• Military
• Aircraft, munitions, missiles, vehicles, marine,
  communications
• Marine
• Warships, tankers, collision avoidance, pleasure
  craft, port entry
• Land
• Automotive, Rail, Agriculture, Wireless and LBS,
  Personal devices, Survey, Public
  Safety/Certification

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Summary - Benefits of Simulation

• Repeatable, Controlled testing environment
• Lower costs compared to numerous field tests
• Test beyond real world conditions
• Reduced time to market
• Prove system to your customers
• Evaluate your Suppliers

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Multi-system, Multi-frequency, Multi-service
receiver development

• Increasing requirements for gt1 GNSS test
  configurations
• GPS/Galileo
• GPS/GLONASS
• GPS/Galileo/GLONASS
• QZSS, SBAS, GRAS, LAAS, Inertial
• High sensitivity requirements
• Interference effects

Spirent Simulators are now commercially
available for all combinations of Systems,
Frequencies, Services and Augmentation
GSS7900 GPS/Galileo Simulator
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Please visit our Stand in the Exhibition
Halldarren.fisher_at_spirent.com