Harris Corporation

Harris Communication

Julian Bartow Willingham

Robert C Hildebrand

Gayle Patrick Martin

Robert W Boyd

Brian P Holt

David A Hosang

Joseph A Brasic

Gates H Fortier

Mark A Webster

Karen W Halford

Gregory S Sinclair

In order to geolocate a wireless communication device (cellular phone) initiating a 911 call, a base station transceiver transmits a supervisory audio tone (SAT), which is automatically looped back by the calling cellular phone. Returned SAT signals are correlated with those transmitted to determine the range of the cellular phone. In addition, incoming signals from the cellular phone, such as the returned SAT signals, are received by a phased array antenna and subjected to angle of arrival processing to determine the direction of the cellular phone relative to the base station. Given this angle of arrival and range information the cellular phone is geolocated. Since the total travel distance of SAT signals between the base station and the cellular phone traverses a two-way path from the base station to the cellular phone and back, plus a loopback path through the circuitry of the phone, the range R of the cellular phone from the base station is calculated in accordance with the equation R&equals;Cxm/2&minus;k, where C is the velocity of light, m is a correlation time shift interval, and k is a correction factor associated with the loopback path, and varies with manufacturer and phone type. The value of k is provided by the phone manufacturer and is accessed using equipment serial number information conveyed in the incoming control channel call establishment request from the calling phone.

Geolocation of cellular phone using supervisory audio tone transmitted from single base station

A channel hand-off control mechanism for a cellular communication network uses the same channels employed for communications between base stations of adjacent cells and a mobile transceiver, as the mobile transceiver moves between those cells, in order to locate the mobile transceiver relative to the base stations, so that the acquiring base station may readily place a narrowbeam channel on the mobile transceiver at hand-off. Each base station employs a phased array antenna, which allows the base station to controllably define its antenna coverage pattern with respect to any mobile transceiver, so as to minimize interference from one or more other transceivers, reducing frequency reuse distance.

Base station hand-off mechanism for cellular communication system

A high capacity broadband base station employs a wideband radio and phased array processing subsystem. The phased array antenna subsystem contains multiple sets or pairs of alternating receive only and transmit/receive elements distributed in a two dimensional spatial array. Each digital wideband radio performs both receive and transmit channel signal processing. In the receive direction, the digital representation of the entire spectrum for each antenna element is divided into channels for the particular waveform of interest. For a 5 MHz PCS GSM, the digital wideband radio separates twenty-four carriers into twenty-four (200 KHz wide) data streams, each of which is representative of a respective channel, and couples each channel to a digital signal processor. In the transmit direction, the radio combines the digital representations of the twenty-four individual channels supplied by the DSP into a single wideband channel for transmission.

High capacity broadband cellular/PCS base station using a phased array antenna

A base station signal processing mechanism for a time division multiple access (TDMA) cellular communication system adaptively controls weighting coefficients of the base station's phased array antenna in a manner that forms a directivity pattern whose gain and/or nulls maximize the signal to noise ratio in the presence of co-channel users whose communication time slots overlap a communication time slot of a desired user. The signal processing mechanism performs correlation processing of synchronization patterns contained in signals transmitted by co-channel users to identify times of transitions between successive co-channel users' communication time slots relative to a time of transition of the desired user's communication time slot, and deriving weighting coefficients in accordance with the times of transitions.

Selective modification of antenna directivity pattern to adaptively cancel co-channel interference in TDMA cellular communication system

In order to geolocate a wireless communication device (cellular phone) initiating a 911 call, a base station transceiver transmits a supervisory audio tone (SAT), which is automatically looped back by the calling cellular phone. Returned SAT signals are correlated with those transmitted to determine the range of the cellular phone. In addition, incoming signals from the cellular phone, such as the returned SAT signals, are received by a phased array antenna and subjected to angle of arrival processing to determine the direction of the cellular phone relative to the base station. Given this angle of arrival and range information the cellular phone is geolocated. Since the total travel distance of SAT signals between the base station and the cellular phone traverses a two-way path from the base station to the cellular phone and back, plus a loopback path through the circuitry of the phone, the range R of the cellular phone from the base station is calculated in accordance with the equation R&equals;C&times;m/2&minus;k, where C is the velocity of light, m is a correlation time shift interval, and k is a correction factor associated with the loopback path, and varies with manufacturer and phone type. The value of k is provided by the phone manufacturer and is accessed using equipment serial number information conveyed in the incoming control channel call establishment request from the calling phone.

A high capacity broadband base station employs a wideband radio and phased array processing subsystem. This phased array antenna subsystem contains multiple sets or pairs of alternating receive only and transmit/receive elements distributed in a two dimensional spatial array. Each digital wideband radio performs both receive and transmit channel signal processing. In the receive direction, the digital representation of the entire spectrum for each antenna element is divided into channels for the particular waveform of interest. For a 5 MHz PCS GSM, the digital wideband radio separates twenty-four carriers into twenty-four (200 KHz wide) data streams, each of which is representative of a respective channel, and couples each channel to a digital signal processor. In the transmit direction, the radio combines the digital representations of the twenty-four individual channels supplied by the DSP into a single wideband channel for transmission.

Growing community of inventors

Melbourne, FL, United States of America

Julian Bartow Willingham