Get access to 90 scenarios simulating example map-matched journeys from the outskirts of 15 major world cities through sub-urban and urban areas to city centres. Error effects in the form of obscuration and multipath. Six separate scenarios provided for each world city: Trajectory only / trajectory & error effects / static position near the city centre with the Land Multipath model applied / versions with different date etc.
Each Scenario Bundle comes with 90 days support providing technical advice specific to the use of scenarios and SimGEN / SimPLEX software features directly related to their use.
For further information contact your local Spirent sales representative or call +44 1803 546325 or email: gnss-solutions@spirent.com.
Introduction to the Land Vehicle City Environment Scenario Set
The operating environment where in-car and portable devices are required to work is universally accepted as being challenging. The principles of GNSS navigation dictate that the fewer number of direct, uninterrupted line of sight signals that a receiver can see, the worse its computation of position velocity and time will be. In some situations there are simply not enough signals to allow a receiver to navigate. In other situations, the receiver’s computed solution is grossly in error due to significant multipath.
These problems present major challenges to designers, developers and integrators of navigation devices. A key part of the solution is to undertake thorough, varied and comprehensive, yet practical and cost-effective testing.
The corresponding Application Note supplied with the scenario set describes a set of simulator test scenarios designed to exercise a GPS receiver in environments representative of suburban, urban and city centre areas.
The scenarios are available for use with the following Spirent GPS simulators:
- STR4500 (SimPLEX software)
- GSS6560 (SimGEN software)
- GSS7700 and GSS7790 (SimGEN software)
- GSS8000 (SimGEN software)
- STR4760 (SimGEN software)
About the Land Vehicle City Environment Scenario Set
The Land Vehicle City Environment Scenario Set comprises 90 scenarios which simulate example journeys from the outskirts of 15 major world cities through sub-urban and urban areas to city centres. These scenarios are intended as a “get you started” set of test cases that will exercise a typical receiver in a range of city environments. The scenario set will “get you started” in your testing with the aim of saving time and expense in your project
The scenario trajectories follow actual roads as referenced by major mapping databases, which allows systems with map-matching functionality to be tested. Each scenario includes example obscuration and multipath error effects which are applied as the simulated vehicle position progresses towards the centre of each city.
The applied obscuration and multipath effects simulate error conditions that represent urban environments. Actual physical obscuration as it exists in reality in each city is not produced. The only exception to this is where a road passes through a tunnel, as the obscuration effects in this case are easily modelled by switching all satellites off and back on, at the appropriate times.
Each scenario is supplied with two antenna patterns. One represents an antenna mounted on the roof of vehicle, as is common with ‘installed’ navigation systems, and the other represents an antenna placed in the windscreen of the vehicle, as is common with ‘portable’ navigation systems (this ‘portable’ version is the default antenna pattern setting in all scenarios).
Six separate scenarios are provided for each world city:
- Trajectory only
- Trajectory & error effects
- Static position near the city centre with the land Multipath model applied
- A version of 1 with a different date
- A version of 2 with a different date
- A version of 3 with a different date
Scenarios 4 ~ 6 are intended to simulate the effects of different visible satellite constellations, and thus different ephemerides, almanac and DOP conditions and resulting errors.
