GPS RF generation for development and product test/quality control
Automotive GPS subsystems are often limited to live-sky signals on the test track. But initiating comprehensive GPS testing by simulation is easy, fast and powerful. Better still, it can reduce development cost and time-to-market. It also allows you to closely monitor and control signal quality and reliability.
Pendulum Instruments, global experts in measurement, analysis, simulation and calibration of time and frequency have outlined several ways their GSG series of GPS/GNSS simulators can aid vehicle GPS system tests. The methods below could aid the development of such systems as:
- Driver assistance
- In-vehicle infotainment
- Fleet management
- Vehicle telematics
- Vehicle dynamics (power train, braking system, suspension etc…)
Drive Testing with record and playback
For automotive makers, test drives can be tedious, expensive and are not always repeatable. The record and playback option allows vehicle testers to drive once and test often by recording the GPS environment associated with a particular route. By uploading the recorded data and modifying, automotive makers can add “what-ifs” to their testing regimen.
Hardware-in-the-loop with Real-Time Scenario Generator (RSG)
Automotive mechatronics can benefit from simulation as a significant enhancement by testing any conceivable possibility. The RSG option supports the integration of actual GPS RF signals into HIL systems by combining fixed latency streaming of 6 degrees-of-freedom trajectory via position, velocity, acceleration and heading commands.
Vehicle orientation and orientation changes, as well as satellite power levels, are also controllable via real-time commands. A common application is testing the integration of a GPS receiver and inertial sensors.
Assisted-GPS for the modern connected vehicle
With a greater number of telecom services being integrated into connected cars, navigation and other location-based services are available through data networks. Pendulum’s A-GPS option tests the ability of the receivers to receive and process assistance data from an LTE signal or RINEX file which is compatible with the simulated RF signal. This can be used to test GPS receivers’ ability to use assisted-GPS data and improve signal acquisition and time-to-first-fix.
Differential GPS enables the future of the driverless vehicles
While GPS signals have served the industry well with tens of meters of accuracy, there is no doubt that much higher location-awareness precision will be required for semiautomatic or fully-automatic guidance. One such approach involves differential measurements and real-time kinematics (RTK) where a localised reference communicates with an onboard GPS receiver to reduce GPS errors down to the centimetre level.
GSG Series GPS/GNSS Simulators
- 1 to 64 satellite or other signals
- Configure-to-order and upgradeable
- Pre-configured test scenarios are easy to modify or create
- Windows software with Google maps interface
- Multi-GNSS, multi-frequency simulation
- GPS standard (L1 C/A), codeless (L2), new GPS (L2C, L5)
- Simultaneous GPS, GLONASS, Galileo, BeiDou
- Stand-alone operation
- Remote control and integration API via a variety of interfaces