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Fundamental GNSS Receiver Characterisation
An overview of some of the fundamental performance parameters of GNSS receivers and how an RF constellation simulator can be used to test them. Aimed at designers, developers, integrators and testers of GNSS receivers or systems. |
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Simulating Multipath
An introductory explanation to Multipath and its effects on GNSS signals, and descriptions of the multipath simulation features available in Spirent's SimGEN simulation software. |
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Simulating UTC leap second insertion events
In order for a receiver to correctly display time based on UTC, it must know the current difference between UTC and GPST. Every so often, leap seconds are inserted into UTC to compensate for the Earth's rotation slowing down. A GPS receiver must recognise changes in the Navigation Data Message that schedule and apply a Leap Second insertion, and correctly adjust their calculation of UTC. This Application note details how to perform a simulator test to ensure a receiver correctly implements a Leap second |
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Simulator to receiver RF connection
Different methods of transmitting the signal from a GNSS simulator to a receiver under test, including coaxial connection, RF radiation, potential issues to be aware of and proper use of certain RF components in the test signal path. |
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Testing GNSS for Automotive Applications
An overview of the main sources of error that affect GNSS receiver performance in the automotive environment, and how an RF constellation simulator can be used to reproduce them. If you are a designer, developer, integrator or tester of GNSS receivers or systems then you should read this. |
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Testing GNSS for Railway Applications
The railway environment can by quite harsh for GNSS receivers. There are many forms of obscuration around a typical railway line that will impede the GNSS signals. Errors in the receiver's PVT solution can also be caused by interference and multipath. Meaningful testing of GNSS systems for use in the railway environment is essential, and using GNSS simulators provides the best solution in terms of repeatability, controllability and significant savings compared to field trails. |
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Testing GNSS System Errors
An overview of the main sources of error inherent in a GNSS system and how an RF constellation simulator can be used to reproduce them. Aimed at designers, developers, integrators and testers of GNSS receivers or systems. |
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Using receiver NMEA in a simulator scenario
How to record NMEA data from a navigating receiver and use it to create a motion trajectory and satellite visibility data file for a simulator scenario that can then be used to test and re-test a receiver, without the need to return the receiver to the location used to record the original data. |
