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Posts Tagged "GNSS simulator"

The effects of multipath cannot be ignored as they can compromise the performance and accuracy of any receiver design. Put simply, multipath refers to the phenomenon of radio frequency (RF) signals reaching the receiver via two or more routes. It is caused by the original signal being reflected or diffracted, typically by a building, geological feature or even water.

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There is no doubt that testing GNSS receivers is a complex business. Today's GNSS simulators are sophisticated instruments with increasing levels of features and complexity. Yet time-to-market pressure on GNSS receiver designers and manufacturers dictate that these simulators must be easy to understand and intuitive to operate. The key to this ease of use is in the graphical user interface (or GUI). And properly designed, the GUI will help simulator users access important information q...

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Of all the performance metrics for a GNSS receiver, navigation accuracy is probably the most important. More to the point, pinpoint static navigation accuracy is essential to the end user. And if he or she doesn't get the exact location fix expected when the receiver is powered up for the first time, there will be little confidence in the overall performance of the receiver. Whether the initial “user test” takes place in the shop before purchase or at home when taking a new unit out...

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One question that regularly crops up in discussions about GNSS receiver testing concerns exactly how the signals get from the GNSS simulator to the device under test. Is it better to radiate the simulator signal to the receiver's antenna, or should you couple them directly? The short answer to this is that a direct connection from the simulator to the receiver's antenna port will always provide the most controlled test environment with no risk of outside influence. The connection is us...

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The ability to integrate a GNSS receiver into an end product offers new possibilities for manufacturers in a wide range of both consumer and industrial markets. However, designers of such products need to be aware that even the most highly integrated GNSS receiver module is not a “fit and forget” component. As with any radio frequency system, there are design rules that must be followed, and even then the interaction of the receiver with the other functions of the product can create some sur...

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We sometimes get carried away into thinking everyone must know what a GNSS simulator is but in reality the proliferation of GPS / GNSS applications into many aspects of technology in such a short time span means that some people have had very little experience with GPS / GNSS technologies. So for those non-experts out there, I’d like to help. A GNSS simulator is a signal generator that provides an effective and efficient means of testing GNSS receivers and the systems that rely on the...

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