초록 ▼

Some embodiments of the invention provide a location-determination system that includes several transmitters and at least one receiver. Each transmitter transmits a signal that includes a unique periodically-repeating component, and the receiver receives a reference signal. Based on the received ref

Some embodiments of the invention provide a location-determination system that includes several transmitters and at least one receiver. Each transmitter transmits a signal that includes a unique periodically-repeating component, and the receiver receives a reference signal. Based on the received reference signal, the location-determination system identifies an estimated location of the receiver as follows. For each transmitter in a set of transmitters, the system computes a phase offset between the received reference signal and a replica of the transmitter's periodically-repeating component. The system also identifies an approximate location of the receiver and an approximate receive time for the received signal. The system then uses the identified approximate location and time, and the computed phase offsets, to compute pseudoranges for the set of transmitters. Finally, the system identifies the estimated location of the receiver by using the computed pseudoranges.

대표청구항 ▼

Some embodiments of the invention provide a location-determination system that includes several transmitters and at least one receiver. Each transmitter transmits a signal that includes a unique periodically-repeating component, and the receiver receives a reference signal. Based on the received ref

Some embodiments of the invention provide a location-determination system that includes several transmitters and at least one receiver. Each transmitter transmits a signal that includes a unique periodically-repeating component, and the receiver receives a reference signal. Based on the received reference signal, the location-determination system identifies an estimated location of the receiver as follows. For each transmitter in a set of transmitters, the system computes a phase offset between the received reference signal and a replica of the transmitter's periodically-repeating component. The system also identifies an approximate location of the receiver and an approximate receive time for the received signal. The system then uses the identified approximate location and time, and the computed phase offsets, to compute pseudoranges for the set of transmitters. Finally, the system identifies the estimated location of the receiver by using the computed pseudoranges. ectrical tracing device as defined in claim 1, further comprising a connector storage rack. 10. The electrical circuit tracing device as defined in claim 7, wherein the hinged lid further comprises a latching device for latching the lid to the housing. 11. An electrical circuit tracing device, comprising: a transmitter including a transmitter circuit and a transmitter housing containing the transmitter circuit, the transmitter housing including a storage compartment with a hinged lid, the storage compartment including one or more connectors, each of the connectors being pre-wired to the transmitter circuit for transmitting a signal along a circuit to be traced by the electrical circuit tracing device; and a wireless receiver including a receiver circuit for detecting a signal transmitted along the circuit to be traced by the transmitter circuit without contacting the circuit to be traced. 12. The electrical circuit tracing device as defined in claim 11, wherein at least one of the connectors is a coaxial cable connector. 13. The electrical circuit tracing device as defined in claim 11, wherein at least one of the connectors is a telephone jack. 14. The electrical circuit tracing device as defined in claim 11, wherein at least one of the connectors is a straight blade. 15. The electrical circuit tracing device as defined in claim 11, wherein at least one of the connectors is an alligator clip. 16. The electrical circuit tracing device as defined in claim 11, wherein the storage compartment includes a storage rack for selectively coupling the pre-wired connectors to the transmitter housing. 17. The electrical circuit tracing device as defined in claim 11, wherein the storage compartment includes a lid. 18. The electrical circuit tracing device as defined in claim 17, wherein the lid is hinged to the transmitter housing. 19. The electrical circuit tracing device as defined in claim 11, wherein the connectors are pre-wired to the transmitter circuit. 20. An electrical circuit tracing device comprising: a transmitter selectively coupled to a circuit to be traced to provide a transmitted signal along the circuit, the transmitter including a housing defining a pocket and a storage compartment with a hinged lid, the storage compartment including one or more connectors, each of the connector being pre-wired to the transmitter circuit for transmitting a signal along the circuit to be traced by the electrical circuit tracing device; a wireless receiver selectively capacitively coupled to the circuit to be traced to detect the transmitted signal, wherein the pocket of the transmitter housing is dimensioned to receive and store the wireless receiver of the electrical tracing device therein; and a clip coupled to the transmitter housing. 21. The electrical circuit tracing device as defined in claim 20, wherein the clip comprises a flexible material which can be pulled back to provide a space for inserting a carrying device between the clip and the housing of the transmitter. 22. The electrical circuit tracing device as defined in claim 20, wherein the transmitter housing further comprises a storage compartment for storing a connector for electrically coupling the transmitter to a circuit to be traced. for selecting said parameter as to which measurement data is to be displayed by the display device and for enabling said measurement data that is to be displayed to be requested from the control-console processing means; a radio for transmitting a said request to the radio that is coupled to the control console and for receiving said measurement data transmitted by the radio that is coupled to the control console; a processor coupled to the keypad, the portable-unit radio and the display device, and adapted for responding to an operation of the keypad to select a parameter as to which measurement data requested from the control-console processing means is to be displayed by causing the portable-unit radio to transmit to the radio coupled to he control console a request for transmission of said measurement data selected by operation of the keypad and for causing the display device to display said measurement data that is received by the portable-unit radio; and means other than the display device for providing an alarm; wherein the portable-unit processor is also coupled to the alarm providing means and is adapted for responding to receipt of an alarm-condition signal by the portable-unit radio by causing the alarm providing means to provide an alarm and by causing the display device to display said alarm condition; and wherein the portable-unit processor is also adapted for responding to receipt of an alarm-condition signal by the portable-unit radio by causing the display device to display said alarm condition in preference to any previously so requested said selected-parameter measurement data. 2. A portable monitoring unit for remotely monitoring measurement data provided at a control console that includes processing means for processing measurement data related to a plurality of monitored parameters and for responding to a request for transmission of measurement data pertaining to a parameter selected from said plurality of monitored parameters by causing a radio coupled to the control-console processing means to transmit said selected-parameter measurement data, and for displaying an alarm condition indicated by the control-console processing means and transmitted by the radio that is coupled to the control console, the portable unit comprising a display device; a keypad for selecting said parameter as to which measurement data is to be displayed by the display device and for enabling said measurement data that is to be displayed to be requested from the control-console processing means; a radio for transmitting a said request to the radio that is coupled to the control console and for receiving said measurement data transmitted by the radio that is coupled to the control console; a processor coupled to the keypad, the portable-unit radio and the display device, and adapted for responding to an operation of the keypad to select a parameter as to which measurement data requested from the control-console processing means is to be displayed by causing the portable-unit radio to transmit to the radio coupled to the control console a request for transmission of said measurement data selected by operation of the keypad and for causing the display device to display said measurement data that is received by the portable-unit radio; and means other than the display device for providing an alarm; wherein the portable-unit processor is also coupled to the alarm providing means and is adapted for responding to receipt of an alarm-condition signal by the portable-unit radio by causing the alarm providing means to provide an alarm and by causing the display device to display said alarm condition; wherein the keypad is adapted for enabling selection of an alarm-acknowledgment signal for transmission to the control console; and wherein the portable-unit processor is adapted for responding to operation of the keypad to select said alarm acknowledgment signal for transmission by causing the portable-unit radio to transmit