Raytheon Company

California Institute of Technology

John Strawn Ward

Goutam Chattopadhyay

Peter H Siegel

Harish M Manohara

William B Noble

Imran Mehdi

Ken B Cooper

Tomas Bryllert

Robert J Dengler

Kevin Yang

Nuria Llombart Juan

Kelly N Cerier

Jan A Tarsala

A device and method of avoiding future self-interference are described. During a current predetermined time period, a priori knowledge of an RF environment is used to determine a change in the environment in a next predetermined time period. Transmission on an interfering channel in response to the change leads to generation of an indication to another device to switch communications in the next predetermined time period to a new channel that is unaffected by transmission on the interfering channel. The new channel is set by the indication or is negotiated by the other device from a list of channels to use in the indication.

Apparatus and method for communications in congested radio frequency environments via dynamic usage exchange

System and method for correcting a phase noise generated by vibration of an antenna transmitting or receiving a radio frequency (RF) signal in a signal propagation direction includes: measuring the vibration of the antenna by a sensor generating an output signal; converting the output signal of the sensor to a measurement signal proportional to the vibration of the antenna in the signal propagation direction; performing a single or double integral of the measurement signal to produce a control signal with an amplitude proportional to the vibrational velocity or displacement of the antenna in the signal propagation direction; and applying the control signal to an oscillator, a clock signal, or a phase controller associated with the RF signal.

System and method for cancelling phase noise induced by antenna vibration

A three-dimensional imaging radar operating at high frequency e.g., 670 GHz radar using low phase-noise synthesizers and a fast chirper to generate a frequency-modulated continuous-wave (FMCW) waveform, is disclosed that operates with a multiplexed beam to obtain range information simultaneously on multiple pixels of a target. A source transmit beam may be divided by a hybrid coupler into multiple transmit beams multiplexed together and directed to be reflected off a target and return as a single receive beam which is demultiplexed and processed to reveal range information of separate pixels of the target associated with each transmit beam simultaneously. The multiple transmit beams may be developed with appropriate optics to be temporally and spatially differentiated before being directed to the target. Temporal differentiation corresponds to a different intermediate frequencies separating the range information of the multiple pixels. Collinear transmit beams having differentiated polarizations may also be implemented.

Multi-pixel high-resolution three-dimensional imaging radar

In an embodiment, a submillimeter wave heterodyne receiver includes a finline ortho-mode transducer comprising thin tapered metallic fins deposited on a thin dielectric substrate to separate a vertically polarized electromagnetic mode from a horizontally polarized electromagnetic mode. Other embodiments are described and claimed.

Submillimeter wave heterodyne receiver

Growing community of inventors

Roanoke, IN, United States of America

John Strawn Ward