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Posts Tagged "SimGEN"

One of the major considerations in designing a GNSS receiver for automotive applications is to ensure that the performance is not unduly affected by roadside buildings. Such structures can both obscure satellite signals from the receiver and reflect them, leading to potentially complex multipath effects. Clearly, it is impractical for a receiver designer to take his or her latest project “on the road” to test out its performance in the presence of every possible size, shape and combina...

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Although a GNSS receiver requires only four satellite signals to provide a complete positional fix in three dimensions, the accuracy of this fix depends to some degree on the exact positions of the four satellites relative to the receiver. If the four signals acquired come from satellites spread throughout the sky relative to the receiver, then the fix should be highly accurate. But if all four are observed in close proximity to each other within a single quadrant, then the fix will be less ...

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By Andy Walker On April 25, 2011
定位
RAIM, SimGEN

RAIM stands for receiver autonomous integrity monitoring, a technology used in GNSS receivers to assess the integrity of the GNSS signals that are being received at any given time. It is particularly applicable to receivers intended for safety-critical applications, and in particular in aviation applications. The RAIM concept makes use of redundant satellite signals – i.e., any that are available above and beyond those needed to produce a position fix. If the pseudorange data in any of...

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