When surveillance systems such as Multilateration (MLAT) or Wide Area Multilateration (WA-MLAT) are used for safety critical applications the integrity of the position information is essential. The integrity monitoring is important due to the probability of occurrences of some fault in a receiving station or for receiving performance due to multipath, or interferences. This paper focuses on the design of an integrity monitor feature that uses redundancy of the Time Difference of Arrival (TDOA) measurements. It consists of four parts: first, an error detection algorithm, similar to that used to warn the user of satellite navigation system, aims to detect any bias in the measurements (it is assumed that only one Time Of Arrival (TOA) measurement is affected by a bias corruption with the exception of the reference one). The power of the related statistical test depends on the amount of redundancy that is present in the system therefore the second step has to monitor the error detectability: if the test performance is insufficient the user should be notified. Third, the position error is estimated by projecting the test statistics into the error domain and if this error crosses a fixed protection limit alarm is raised. Finally, the faulty measurement is identified and eliminated from location solution. In the paper the classical Autonomous Integrity Monitoring (-AIM- a monitoring algorithm that uses the measurements of one particular subsystem without using information coming from other systems) and Fault Detection and Exclusion (that is the capability of the system to detect and exclude from the solution the faulty measurement) used in GNSS are analysed and rearranged to be used in Multilateration system (TDOA instead of pseudorange measurements, Different and fixed geometry, non diagonal covariance matrix and so on call for different assumption and different formulation ofthe canonical algorithms used in GNSS).
Integrity monitoring for multilateration system: Design and performance evaluation
2007
10 Seiten, 10 Bilder, 8 Quellen
Conference paper
Storage medium
English
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