Ground-based system and method to monitor for excessive delay gradients using long reference receiver separation distances

Abstract

Systems and methods for monitoring excessive delay gradients using long reference receiver separation distances are provided. In one embodiment, a ground-based system comprising a plurality of reference receivers configured to receive satellite signals. The ground-based system further comprises a processor coupled to a memory. The processor is configured to determine whether the line of sight of a newly available satellite is within a gradient. The processor is further configured to determine a monitor measurement using accumulated carrier data for each pair of reference receivers of a plurality of reference receiver pairs. The processor is further configured to combine monitor measurements for a subset of the plurality of reference receiver pairs into a monitor discriminator. The processor is further configured to output an alert when the monitor discriminator exceeds a threshold.