Portable GPS-receiver for a personal safety system

• US 6,480,557 B1
• Filed: 09/26/2001
• Issued: 11/12/2002
• Est. Priority Date: 06/17/1999
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ivanov, Vladimir Nikolaevich, Malashin, Viktor Ivanovich, Pisarev, Serguey Borisovich, Poverennyi, Denis Georgievich, Silin, Mikhail Jurievich, Shebshaevich, Boris Valentinovich, Rog, Andrey Leonidovich, Fedotov, Boris Dmitrievich
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Bayard, Emmanuel
• Application Number:
  US09/763,028
• Time in Patent Office: 412 Days
• Field of Search: 375/142, 375/150, 375/347, 375/349, 375/343, 375/316, 342/357.12, 701/215, 455/13.2, 455/12.1, 455/132
• US Class Current: 375/349
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/25 involving aiding data received from a cooperating element, e.g. assisted GPS
• CPC Class Codes: G01S 19/254 relating to Doppler shift of satellite signals
• CPC Class Codes: G01S 19/256 relating to timing, e.g. time of week, code phase, timing offset
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/30 code related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/36 relating to the receiver frond end
• CPC Class Codes: G01S 2205/006 for emergency situations
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile

Abstract

The portable GPS-receiver for a system of personal safety having such attributes, as diminished power consumption, overall dimensions and weight, because the input unit contains the multichannel digital correlator with N=by 8 to 12 channels of parallel processing connected with the microprocessor equipped with permanent storage unit for storage of the programs of signal processing and operative storage for data storage by activity in a standard mode without interlock of GPS signals, thus the microprocessor of the output unit is connected by trunks of a data exchange to the former of clock signals and heterodyne frequencies of an input unit, with an input-output unit of the data, with the transceiver unit and in addition provided with the permanent storage unit for storage of the programs of signal processing and operative storage for data storage and samples of the multichannel digital correlator for operation in conditions of interlock of GPS signals, and each of N of channels of the multichannel digital correlator is equipped with K inphase and Ko quadrature correlators, where K=20 to 40, connected with the appropriate storage units ensuring a capability of a simultaneous correlation of GPS signals with K copies of C/A code, shifted on half of digit of C/A GPS code, and coherent accumulation of results of a correlation on an interval equal to duration of epoch of C/A code.

Claims

1. A portable GPS-receiver for a system of personal safety comprising:

sequentially connected input and output units;

a data input-output unit; and

a transceiver unit for a reception and a transmission of data through a communication channel,

wherein

the communication channel links the portable GPS receiver with a base station,

an output of a reference signal of the transceiver unit is connected to a reference input of the input unit,

a clock input of the output unit is connected to a clock output of the input unit,

the input unit comprises;

a radio frequency signal converter, whose signal input is a signal input of the input unit;

an analog-to-digital conversion of signals unit, whose output is a signal output of the input unit, wherein the radio frequency converter and the analog-to-digital conversion of signals unit are sequentially connected; and

a former of signals of clock and heterodyne frequencies, wherein a reference input of the former is a reference input of the input unit, a heterodyne output of the former is connected to a heterodyne input of the radio frequency signal converter, and a clock output of the former, being a clock output of the input unit, is connected to a clock input of the unit of analog-to-digital conversion of signals,

the output unit further comprising;

a multichannel digital correlator with N=8 to 12 channels of parallel processing;

a microprocessor connected with the multichanel digital correlator, the microprocessor comprising;

a constant storage for storage of programs of signal processing; and

an operative storage for storage of data used by the portable GPS-receiver when operating in a standard mode without blockage of GPS signals;

an additional constant storage; and

an additional operative storage,

wherein the microprocessor is connected by data buses to;

the former of the signals of clock and heterodyne frequencies, to the data input-output unit,

the transceiver unit,

the additional permanent storage for storage of the programs of signal processing, and

the additional operative storage for storage of data and calculated values of the multichannel digital correlator used by the portable GPS receiver when operating in conditions of blockage of GPS signals, and

wherein each of the N channels of the multichannel digital correlator comprises K inphase and K quadrature correlators, where K=20 to 40, connected with corresponding ones of the permanent and operative storage units, thereby ensuring simultaneous correlation of GPS signals with K copies of a C/A code of GPS, shifted by one half of a digit of the C/A code of GPS, and coherent accumulation of results of a correlation on an interval equal to a duration of an epoch of C/A code.

2. The receiver as in claim 1, wherein each of the N channels of the multichannel digital correlator comprises:

a digital controlled generator of a carrier frequency;

a control register;

a digital controlled code generator;

a generator of a reference C/A code of GPS;

a programmed delay line;

first and second digital mixers of inphase and quadrature channels of processing, respectively;

first and second groups of K inphase and K quadrature correlators, wherein first inputs of the correlators are connected to outputs of corresponding digital mixers, second inputs of the correlators are connected to corresponding outputs of a programmed delay line, and outputs of the correlators are connected to signal inputs of the corresponding ones of the storage units; and

a data exchange unit which links outputs of the corresponding ones of the storage units, control input of the digital controlled generator of a carrier frequency, control input of the control register, control input of the digital controlled code generator and first input of the generator of the reference C/A code with the microprocessor of the output unit,

wherein linked with each other, signal inputs of the first and second digital mixers form a signal input of each of the N channel,

linked with each other, clock inputs of the digital controlled generator of the carrier frequency, digital controlled code generator, the programmed delay line and the storage units form a clock input of each of the N channel,

the second inputs of the first and second digital mixers are connected respectively to the first and second outputs of the digital controlled generator of the carrier frequency,

signal and control inputs of the programmed delay line are connected respectively to an output of the generator of the reference C/A code of GPS and to the first output of the control register,

the second output of the control register is connected to the second input of the generator of the reference C/A code of GPS, and

a third input of the generator of the reference C/A code of the GPS is connected to an output of the digital controlled code generator,

thereby in the multichannel digital correlator, linked with each other signal inputs of the N channels and linked with each other clock inputs of the N channels form respectively signal and clock inputs of the multichannel digital correlator.