The GBAS correction cannot compensate for aircraft receiver errors. Its basic principle is to measure the errors of the GNSS satellite signals and to relay these errors to the user receivers. This error can be caused by any of the GPS erros, such as tropospheric and ionospheric delay, dilution of precision or satellite clock error. The reference station acts as an user receiver: It measures the GNSS position as a normal user receiver does and then compares the GNSS position to its known reference position.
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