Patent ID: 6690323
Filing Date: 2004-02-10
Classification: G01S

Abstract:
A GPS-receiver with emergency communication channel comprising:a radio frequency converter of GPS signals; an analog-to-digital signal converter; a channel switch; a first storage for storing samples of values of signals; a signal processor; a correlation processing unit; a navigational processor including means for developing data on a carrier frequency for controlling the signal processor and the correlation processing unit; an input/output interface; a generator of signals of clock and heterodyne frequencies which includes synthesizers of frequencies; a base frequency generator; unit of transmission and reception of massages on a communication channel linking the receiver to a base station; unit of determination of deviation of a signal frequency generated by the base generator from a nominal value; and a second storage for storing data representative of deviation of a signal frequency of the base generator from a nominal value, wherein: said radio frequency converter of GPS signals, said analog-to-digital signal converter and said channel switch are connected in series; the first storage and the signal processor are sequentially connected, to a first output of the channel switch are linked the sequentially connected first storage and signal processor, and to a second output of the channel switch is linked unit of the correlation processing unit; the signal processor and the correlation processing unit are connected with the navigational processor; a heterodyne input of the radio frequency converter and clock inputs of the analog-todigital signal converter, of the first storage and of the correlation processing unit are connected to the respective outputs of the generator of signals of clock and heterodyne frequencies; a reference input of the generator of signals of clock and heterodyne frequencies, formed by reference inputs of the corresponding synthesizers of frequencies, is connected to an output of the base generator; a control input of the generator of signals of clock signals and heterodyne frequencies, formed by inputs of initial settings of the corresponding synthesizers of frequencies, and a control input of the channel switch are connected to the navigational processor; the input-output interface and the unit of transmission and reception of the messages on communication channel linking the receiver to a base station are connected to the navigational processor; the unit of determination of deviation of the signal frequency of the base generator from the nominal value comprises: a first input connected to an output of the base frequency generator, a second input connected by a signal bus to a corresponding output of the unit of transmission and reception of the messages on communication channel, and an output connected to the second storage, said second storage connected with the means for developing data on a carrier frequency in the navigational processor for controlling the signal processor and the correlation processing unit when searching for signals.