GPS RECEIVER WITH EMERGENCY COMMUNICATION CHANNEL

摘要

The present invention relates to a GPS receiver with an emergency communication channel for receiving/transmitting emergency messages about critical situations. The receiver includes the traditional circuit of radio-navigation receivers operating by GPS standards and further includes a unit for determining the frequency shift of a signal from a reference generator relative to a nominal value. The first input of said unit is connected to the output of the reference generator, while the second input is connected through a signal transmission bus to the corresponding output of a unit for transmitting and receiving messages on the communication channel. The output of the unit for determining the frequency shift is connected to storage means for storing data about frequency shift of the signal from the reference generator relative to the nominal value, wherein said means are provided in the navigation processor memory unit and are connected with means for generating carrier frequency data in the navigation processor in order to control the signal processor and a correlative processing unit upon signal search.