SYSTEMS AND METHODS TO MONITOR FOR FALSE ALARMS FROM IONOSPHERE GRADIENT MONITORS

摘要

Systems and methods to monitor for false alarms from ionosphere gradient monitors are provided. In one embodiment, a method for mitigating false gradient alarms in a satellite navigation Ground Based Augmentation System (GBAS) ground station comprising a plurality of satellite navigation system reference receivers comprises: generating an alarm signal with an ionosphere gradient monitor (IGM) at the GBAS ground station; determining whether the alarm signal is a false alarm based on data derived from carrier phase measurements received from the plurality of satellite navigation system reference receivers; and blocking the alarm signal for at least a first duration of time based on the determining.

主权项

1. A system for mitigating ionosphere gradient monitor (IGM) false alarms, the system comprising:
at least three global navigation satellite reference receivers that output carrier phase measurements; a processing module coupled to the at least three global navigation satellite reference receivers, the processing module comprising a gradient estimator module that outputs an IGM alarm via a switch when an excessive delay gradient is detected based on the carrier phase measurements; and a parity evaluator coupled to the switch, wherein the parity evaluator inputs carrier phase double difference data calculated from the carrier phase measurements and determines a parity error from the carrier phase double difference data, wherein when the parity error exceeds a threshold the parity evaluator operates the switch to block the IGM alarm.