GPS receiver with emergency communication channel

• US 6,690,323 B1
• Filed: 12/21/2001
• Issued: 02/10/2004
• Est. Priority Date: 05/25/1999
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Poverennyi, Denis G., Malashin, Viktor I., Silin, Mikhail Y., Ivanov, Vladimir N., Rog, Andrey L., Fedotov, Boris D., Shebshaevich, Boris V., Pisarev, Sergey B.
• Primary Examiner(s): Blum, Theodore M.
• Application Number:
  US09/720,902
• Time in Patent Office: 781 Days
• Field of Search: 342/357.09, 342/357.1, 342/357.12, 701/213
• US Class Current: 342/357.55
• CPC Class Codes: G01S 19/17 Emergency applications
• CPC Class Codes: G01S 19/235 Calibration of receiver components

Abstract

The GPS-receiver with emergency communication channel, intended for message passing about emergency situations, containing the known design of the radio navigational receiver working in the GPS system, into which the unit of determination of deviation of a signal frequency of the base generator from a nominal value is in addition entered, whose first input is connected to an output of the base generator, the second input is connected by the signal bus to the appropriate output of the unit of transmission and reception of the messages on communication channel, and output—with means of data storage about deviation of a signal frequency of the base generator from a nominal value in the memory unit of the navigational processor for control of the signal processor and unit of correlation processing in searching for signals.

Claims

1. 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.

2. The receiver as claimed in claim 1, wherein the unit of determination of deviation of the signal frequency of the base generator from a nominal value comprises:

a first frequency divider;

a frequency tuning unit;

a phase detector;

an integrating link;

a second frequency detector; and

a shaping unit for generating data indicative of the deviation of the signal frequency of the base generator from the nominal value,

wherein;

an output of the first frequency divider is connected to a first input of the phase detector via the tuning frequency unit, a second input of the phase detector is connected to an output of the second frequency divider,

an output of the phase detector is connected to a control input of the frequency tuning unit, via the integrating link, and to a signal input of the shaping unit,

an input of the first frequency divider and an output of the shaping unit from the first input and the output of the unit of determination of the deviation of the signal frequency of the base generator from the nominal value, and

an input of the second frequency divider and a control input of the shaping unit form the second input of the unit of determination of the deviation of the signal frequency of the base generator from the nominal value.

3. A GPS-receiver with emergency communication channel comprising:

a base frequency generator generating a signal for synchronizing signals of clock and heterodyne frequencies; and

;

a unit for determining deviation of a frequency of the signal generated by the base frequency generator from a nominal value.

4. The GPC receiver as claimed in claim 3 further comprising a memory for storing data representative of the deviation of the signal frequency of the base frequency generator from the nominal value.

5. The GPC receiver as claimed in claim 4 further comprising means for adjusting signal processing of the GPS receiver in accordance with the data representative of the deviation of the signal frequency of the base frequency generator from the nominal value.