Aeroscout Ltd.

Bluesoft, Inc.

Alan Bensky

Shlomo Berliner

Edward Mirodin

Uri Holzkaner

Gil Baver

Reuven Ameslem

Reuven Amsalam

Daniel Aljadaff

Efraim Zilber

A method and system for distance measurement in a low or zero intermediate frequency (IF) half-duplex communications loop measures the distance between two transceivers without synchronizing the local oscillators of the two transceivers. Transceiver distance may be measured in systems that use direct conversion (zero IF) or intermediate frequencies that are so low that phase noise significantly reduces the accuracy of the distance measurement. The communications loop demodulates, re-modulates and retransmits a received signal to provide a re-transmitted signal that has the same carrier and modulation frequency as the received signal. A phase-hold circuit provides an analog system for half-duplex operation that retains the frequency and phase information of the received signal for retransmission in a subsequent time slot. Alternatively, a digital implementation provides phase and frequency retention via a sample and delay system comprising an analog-to-digital conversion (ADC) subsystem, a first-in-first-out (FIFO) memory and a digital-to-analog (D/A) converter.

Method and system for distance measurement in a low or zero intermediate frequency half-duplex communications loop

A system and method is capable of identifying multipath wireless signals, their relative strength, and their position. The system and method may be used in wireless distance measurement to generate a distance measurement free of multipath distortion. First and second wireless devices transmit and receive signals to generate multipath information. For distance measurements, this information may be used to calculate the true distance between two wireless devices that is compensated for multipath. The system and method may be used in a mobile wireless communications system to discriminate between various mobile wireless communications devices located in a region, for example, to conduct a commercial transaction or transmit or receive other information.

System and method for reducing multipath distortion in wireless distance measurement systems

A system, apparatus, and method for determining the distance between two objects using an indirect propagation delay measurement is disclosed. A frequency hopping scheme (such as the Bluetooth&#x2122; technology) is used to measure the relative phase offset of the received signal between the various frequencies. For a given distance between the objects, the phase offset vs. frequency curve is a straight line with the slope dependent upon the measured distance. After the phase of the received signals is detected, the data is plotted on a curve and the slope is calculated.

Accurate distance measurement using RF techniques

Growing community of inventors

Rehovot, Israel

Alan Bensky