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- W2956142457 abstract "Airborne WAAS Beta 3 sensors have to perform receiverautonomous integrity monitoring (RAIM) and faultdetection and exclusion (FDE) operations that determinehorizontal and vertical protection levels (HPL/VPL) andalso detect and exclude biased measurements from failedsatellites. The RAIM and FDE algorithms employed haveto meet the availability and performance requirementsspecified in DO-229D in order to be used during Non-Precision Approach (NPA) and Precision Approach (PA)modes of the flight. NIORAIM (Novel Integrity-Optimized RAIM) is a method presented by Hwang andBrown (2005) to improve availability of RAIM byweighting the pseudo range measurements in a non-linearfashion. The non-linearly weighted range measurementsare then used to compute a position fix. The NIORAIMweights are chosen to improve availability of integritywith a slight cost to accuracy. The NIORAIM algorithmhelps to lower the minimum detectable bias (MDB) forthe given geometry and noise model. NIORAIM methodsthat have been published are difficult to implement on real-time airborne GPS receivers that have strict memoryand processing constraints. This paper presents a methodof implementing NIORAIM on a real-time WAAS Beta 3sensor. The paper also presents a genetic algorithmapproach to determine the NIORAIM weights. Acomparative availability analysis is presented here thatcompares RAIM and NIORAIM when used over thecontinental United States. The challenges involved incalculating the protection levels and the softwareoptimizations required is discussed. The paper alsooutlines a number of efficient numerical methods thatwere implemented on the embedded receiver software.The paper will present the comparative availability testresults for both single and double satellite faults duringboth NPA and PA modes of flight. It is seen thatNIORAIM consistently out-performs RAIM in allsituations. The improvement in availability performanceoffered by NIORAIM is far more pronounced whenconsidering a GPS only constellation as opposed to aGPS+Galileo constellation. To the author’s knowledgethis work is the first published real-time implementationof NIORAIM." @default.
- W2956142457 created "2019-07-12" @default.
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- W2956142457 date "2009-01-28" @default.
- W2956142457 modified "2023-09-23" @default.
- W2956142457 title "Analysis of a Real-Time Genetic NIORAIM Implementation on a WAAS Beta 3 Receiver" @default.
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