Abstract: In an ultra-wideband (“UWB”) communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (“PRF”). Methods are also disclosed for transmitting packets discontinuously.

Abstract: In an ultra-wideband (“UWB”) communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (“PRF”). Methods are also disclosed for transmitting packets dis-continuously.

Abstract: A hybrid global location tracking system is disclosed. The hybrid global location tracking system includes an anchor device(s) and multiple tag devices, each including an ultra-wideband (UWB) transceiver circuit. The anchor device(s) can broadcast a location request to wake up the tag devices for location update. Each of the tag devices can measure a distance and an angle based on the received location request and report the measured distance and angle to the anchor device(s), either directly or through another tag device(s) located within communication range of the anchor device(s). Herein, the anchor device(s) can also determine its own global positioning coordinate and orientation. Accordingly, a global positioning location can be determined for each tag device based on the global positioning coordinate and the orientation of the anchor device(s), and the distance and angle reported by the tag device, without requiring a global positioning receiver in the tag device.

Abstract: An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x, y) location of the transmitter relative to the receiver can be directly determined.

Abstract: An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x,y) location of the transmitter relative to the receiver can be directly determined.

Abstract: In an ultra-wideband (“UWB”) communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (“PRF”). Methods are also disclosed for transmitting packets dis-continuously.

Abstract: A method of synchronizing signals is disclosed. The method comprises using a clock tracking system to convert a future event target time specified in a time base of a master device into the local unsynchronized time bases of one or more slave devices. Each of the slave devices then generates an event signal at the converted time, such that a coordinated delivery of synchronized signals is achieved.

Abstract: An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x,y) location of the transmitter relative to the receiver can be directly determined.

Abstract: An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x, y) location of the transmitter relative to the receiver can be directly determined.

Abstract: An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x, y) location of the transmitter relative to the receiver can be directly determined.

Abstract: In an ultra-wideband (“UWB”) communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (“PRF”). Methods are also disclosed for transmitting packets dis-continuously.

Abstract: In an ultra-wideband (“UWB”) communication system, methods are disclosed for transmitting packets in multiple portions, each having a different pulse repetition frequency (“PRF”). Methods are also disclosed for transmitting packets dis-continuously.

Abstract: An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x, y) location of the transmitter relative to the receiver can be directly determined.

Abstract: A method of synchronizing signals is disclosed. The method comprises using a clock tracking system to convert a future event target time specified in a time base of a master device into the local unsynchronized time bases of one or more slave devices. Each of the slave devices then generates an event signal at the converted time, such that a coordinated delivery of synchronized signals is achieved.

Abstract: In an ultra-wideband (“UWB”) communication system comprising a pair of UWB transceivers, an asynchronous two-way ranging method for closely estimating the time-of-flight between the transceivers after the exchange of only 3 messages between the transceivers. In an alternate asynchronous two-way ranging method, the time-of-flight between the transceivers may be closely estimated after the exchange of only 4 messages between the transceivers.

Abstract: An ultra-wideband communication and/or location system having a plurality of channels, each implementing a respective one of a plurality of predetermined codewords. Within each channel, one or more predetermined pulse repetition frequencies are defined. Within a single UWB system, more than two networks of transceivers may be co-located without mutual interference if each is assigned a unique combination of codewords and spreading factors.

Abstract: In an RF system comprising a first transceiver (96) and a second transceiver (98), a first transmission, T1, by the first transceiver (96) allows the second transceiver (98) to determine two possible valid angles of arrival, ±?1, of T1. A second transmission, T2, from the second transmitter (98) to the first transmitter (96) containing ?1 and a bearing, ?1, of a known fixed anchor relative to the second transmitter (98), allows the first transmitter (96) to determine two possible valid angles of arrival, ±?2, of T2. From ?1, ?1, ?2, and a bearing, ?2, of the known fixed anchor relative to the first transmitter (96), the first transceiver (96) can determine the valid angle of arrival of T2.

Abstract: In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. The samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, a stream of estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”) substantially to filter channel-injected noise. The time of arrival of the first arriving path is developed from the stream of CIR estimates.

Abstract: An ultra-wideband communication and/or location system having a plurality of channels, each implementing a respective one of a plurality of predetermined codewords. Within each channel, one or more predetermined pulse repetition frequences are defined. Within a single UWB system, more than two networks of transceivers may be co-located without mutual interference if each is assigned a unique combination of codewords and spreading factors.

Abstract: In an ultra-wideband (“UWB”) communication system comprising a pair of UWB transceivers, an asynchronous two-way ranging method for closely estimating the time-of-flight between the transceivers after the exchange of only 3 messages between the transceivers. In an alternate asynchronous two-way ranging method, the time-of-flight between the transceivers may be closely estimated after the exchange of only 4 messages between the transceivers.