Location messaging system using GPS

A GPS management station for managing a GPS receiver that receives navigation messages from a plurality of satellites and measures the location of the GPS receiver corresponding to the navigation messages and for downloading the navigation messages received from the satellites, comprising:

• a wireless hand held means connected to said GPS receiver for receiving or transmitting data and control commands;
• a network means for transmitting a control signal to the GPS receiver so as to control the GPS receiver;
• means for receiving navigation messages with time information corresponding to said navigation messages to compensate the error location of the GPS receiver at which the navigation messages were extracted from the GPS receiver;
• means for storing said navigation messages and obtaining a difference message of the navigation at a measuring time;
• an input or output means for transmitting to or receiving data through said network means so as to control said GPS receiver;
• and
• means for receiving a control signal from a navigation control base for determining a measuring time in a predetermined time interval;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A location messaging system, comprising:

• a GPS receiver for receiving navigation messages from a plurality of satellites and measuring the location of the GPS receiver corresponding to the received navigation messages, said GPS receiver having
• signal processing means for receiving signals from the satellites, extracting navigation messages from the signals, and measuring the location of said GPS receiver corresponding to the extracted navigation messages,
• a wireless transmitting means for adding time information corresponding to said navigation messages to compensate the error location of the GPS receiver at which each of the navigation messages was extracted to the relevant navigation message, storing the navigation message and obtaining a difference information of the navigation messages at a measuring time, and transmitting the resultant data to the outside of said GPS receiver through a hand-held terminal;
• and
• receiving means for receiving a control signal from a navigation control base for determining a measuring time in a predetermined time interval;
• and
• a GPS management station having:
• means for transmitting a control signal to said GPS receiver so as to control the GPS receiver;
• means for storing said navigation messages and obtaining a difference message of the navigation at said measuring time;
• and
• means for receiving navigation messages base through a network means with time information corresponding to said navigation messages at which the navigation messages were extracted from said GPS receiver;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A location messaging system, comprising:

• a GPS receiver for receiving navigation messages from a plurality of satellites and measuring the location of the GPS receiver corresponding to the received navigation messages, said GPS receiver having
• signal processing means for receiving signals from the satellites, extracting navigation messages from the signals, and measuring the location of said GPS receiver corresponding to the extracted navigation messages,
• a wireless transmitting means for adding time information corresponding to said navigation messages to compensate the error location of the GPS receiver at which each of the navigation messages was extracted to the relevant navigation message, storing the navigation message and obtaining a difference information of the navigation messages at a measuring time, and transmitting the resultant data to the outside of said GPS receiver through a hand-held terminal;
• and
• receiving means for receiving a control signal from a navigation control base for determining a measuring time in a predetermined time interval;
• a GPS management station having:
• means for transmitting a control signal to said GPS receiver so as to control the GPS receiver, and
• means for receiving navigation messages base through a network means with time information corresponding to said navigation messages at which the navigation messages were extracted from said GPS receiver;
• and
• means for storing said navigation messages and obtaining a difference message of the navigation at said measuring time;
• an information unit for communicating with said GPS management station;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A GPS management method for managing a wireless, hand-held GPS receiver that receives navigation messages from a plurality of satellites and measures the location of the GPS receiver corresponding to the navigation messages and for downloading the navigation messages received from the satellites, comprising the steps of:

• transmitting a control signal to the GPS receiver so as to control the GPS receiver;
• receiving navigation messages with time information corresponding to said navigation messages to compensate the error location of the GPS receiver at which the navigation messages were extracted from the GPS receiver;
• receiving a control signal from a navigation control base for determining a measuring time in a predetermined time interval;
• communication with said base through a network means;
• transmitting to or receiving data from said base through said network means so as to control said GPS receiver;
• and
• storing said navigation messages and obtaining a difference message of the navigation at a measuring time;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A location messaging method of a system having:

• a wireless, hand held GPS receiver for receiving navigation messages from a plurality of satellites and measuring the location of the GPS receiver corresponding to the received navigation messages, and
• a GPS management station, the location messaging method comprising the steps of:
• causing the GPS receiver to receive signals from the satellites, extract navigation messages from the signals, and measure the location of the GPS receiver corresponding to the extracted navigation messages;
• causing the GPS receiver to add time information corresponding to said navigation messages to compensate the error location of the GPS receiver at which each of the navigation messages was extracted to the relevant navigation message, store the navigation message and obtaining a difference information of the navigation messages at a measuring time, and transmit the resultant data to the outside of the GPS receiver through a hand-held terminal;
• causing the GPS management station to transmit a control signal to the GPS receiver so as to control the GPS receiver;
• receiving a control signal from a navigation control base for determining a measuring time in a predetermined time interval;
• communication with said base through a network means;
• transmitting to or receiving data from said base through said network means so as to control said GPS receiver;
• and
• causing the GPS management station to receive navigation messages with time information corresponding to said navigation messages at which the navigation messages were extracted from the GPS receiver;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A location messaging method of a system having:

• a GPS receiver for receiving navigation messages from a plurality of satellites and measuring the location of the GPS receiver corresponding to the received navigation messages,
• a GPS management station, and
• an information unit, the location managing method comprising the steps of:
• causing the GPS receiver to receive signals from the satellites, extract navigation messages from the signals, and measure the location of the GPS receiver corresponding to the extracted navigation messages;
• causing the GPS receiver to add time information corresponding to said navigation messages to compensate the error location of the GPS receiver at which each of the navigation messages was extracted to the relevant navigation message, store the navigation message and obtaining a difference information of the navigation messages at a measuring time, and transmit the resultant data to the outside of the GPS receiver through a wireless hand-held terminal;
• causing the GPS receiver to receive a control signal from a navigation control base for determining a measuring time in a predetermined time interval
• causing the GPS management station to transmit a control signal to the GPS receiver so as to control the GPS receiver;
• causing the GPS management station to receive navigation messages with time information corresponding to said navigation messages at which the navigation messages were extracted from the GPS receiver;
• a network means for communication with said base;
• an input or output means for transmitting to or receiving data from said base through said network means so as to control said GPS receiver;
• and
• causing the GPS management station to transmit the location information of the GPS receiver corresponding to the navigation messages to the information unit;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A communication system comprising:

• a GPS receiver having the functionality of a wireless communication device;
• a base station;
• and
• an information terminal device which can communicate with said GPS receiver through said base station, generating a control command for controlling said GPS receiver, transmitting said command to said GPS receiver through said base station, wherein said GPS receiver operates based on said command transmitted from said information terminal device;
• a network means for communication with said base;
• an input or output means for transmitting to or receiving data from said base through said network means so as to control said GPS receiver;
• and
• wherein said GPS receiver receives a control signal from a navigation control base for determining a measuring time in a predetermined time interval and a difference information of navigation messages is obtained at said measuring time;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

A communication method having a GPS receiver having the functionality of a wireless communication device, a base station and an information terminal device which can communicate with said GPS receiver through said base station comprising the steps of:

• communicating between said GPS receiver and an information terminal device through said base station;
• generating a control command for controlling said GPS receiver;
• transmitting said command to said GPS receiver through said base station, wherein said GPS receiver operates based on said command transmitted from said information terminal device;
• a network means for communication with said base;
• an input or output means for transmitting to or receiving data from said base through said network means so as to control said GPS receiver;
• receiving a control signal from a navigation control base for determining a measuring time in a predetermined time interval;
• and
• obtaining a difference information of navigation messages at said measuring time;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.

An information terminal device which communicates with a GPS receiver having the functionality of a wireless communication device, comprising:

• a generator for generating a control command for controlling said GPS receiver;
• a transmitter for transmitting said command to said GPS receiver through a base station, wherein said GPS receiver operates based on said command wherein said GPS receiver receives a control signal from a navigation control base for determining a measuring time in a predetermined time interval and obtains a difference information of navigation messages at said measuring time;
• and
• a network means for communication with said base;
• an input or output means for transmitting to or receiving data from said base through said network means so as to control said GPS receiver;
• whereby said GPS receiver is operable to power up in response to a message from said base requesting that said receiver transmit data and power down in response to a message from said base acknowledging that said base has successfully received data transmitted from said receiver.