Abstract: A system and method of the present invention determines the location of a transmitting mobile unit. A mobile unit has a global positioning system (GPS) unit and transmitter for transmitting an RF signal that includes an identification of the mobile unit and GPS location coordinates, if available. At least one receiver forms a first infrastructure and is contained within an area having good GPS reception for receiving a transmitted signal from the mobile unit when in the area relating to the identification of the mobile unit and the GPS location coordinates or other GPS data obtained from the GPS unit. At least one receiver forms a second infrastructure and is contained within an area having poor GPS reception for receiving transmitted signals from the mobile unit when in the area relating to an identification of the mobile unit and for measuring the angle of arrival and/or time of arrival, multipath profile, or other characteristics of transmitted signals from the mobile unit.

Abstract: 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.

Abstract: A system and method for instantly summoning assistance to the location of an emergency. A mobile unit providing subscriber communications with an operator or emergency service provider includes a beacon signal generator for directing service providers to the location of the emergency. Subscriber communications are established using an existing personal communication system. The beacon signal generator transmits a wideband spread spectrum that is analyzed at receiving stations to determine the location of the mobile unit.

Abstract: 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.

Abstract: An emergency location system and method for determining the location of a caller sending an emergency signal without utilizing the bandwidth of the calling system. The system may be readily attached to existing telephone, radio-telephone and similar communicating devices through existing detachable battery packs. Detection of the need to send the locating signal may be based on automatic detection of a predetermined dialing sequence or through a dedicated switch (i.e., a "panic switch") or both.

Abstract: A system and method for monitoring the location and/or presence of an object/person within a desired area includes a mobile base station, a central control center, a mobile signaling device carried by the monitored object/person, and a geolocating means. The mobile base station may be transported to an arbitrary site and retains the monitored object/person within a desired area. The central control center determines the acceptability of the location of the monitored object/person and may raise an alarm condition when the monitored object/person is not within the desired area.