Raytheon Company

Alexander Niechayev

Jimmie D Huff

James Leatham

Thomas R Yengst

Joseph C Marron

Stephen P Palese

Shubha Kadambe

Duane Donald Smith

Moe Soltani

Charley A Fodran

Ted Y Lumanlan

Jeffrey P Tate

George R Cooper

A device includes a photonic integrated circuit having an optical phased array. The optical phased array includes multiple array elements, where each array element includes (i) an antenna element configured to transmit or receive optical signals and (ii) a phase modulator configured to phase-shift the optical signals transmitted or received by the antenna element. The device also includes multiple digital register in integrated circuit (DRIIC) cells, where each DRIIC cell is associated with one of the array elements. The DRIIC cells are configured to receive digital inputs and to provide outputs to the phase modulators of the associated array elements in order to control the phase-shifts of the optical signals transmitted or received by the antenna elements based on the digital inputs.

Digital input circuit design for photonic integrated circuit

A device includes a photonic integrated circuit (PIC), which includes an optical phased array. The optical phased array includes multiple array elements, where each array element includes (i) an antenna element configured to transmit or receive optical signals and (ii) a phase modulator configured to modulate the optical signals transmitted or received by the antenna element. The PIC also includes at least one of (i) a source laser configured to generate optical energy, where the antenna elements are configured to transmit the optical signals based on the optical energy, and (ii) a receiver configured to receive and process the optical signals received by the antenna elements.

Photonic integrated circuit-based communication transmit/receive system

Methods and apparatus to receive radar pulses, process the received pulses using weighted finite state machine to learn a model of an unknown emitter generating the received radar pulses, and estimate a state/function of the unknown emitter based on the received radar pulses using the learned model, and predict the next state/function of the unknown emitter based on the received radar pulses and applying maximum likelihood estimation.

Processing unknown radar emitters

An uncorrelated clutter noise cancellation method and apparatus employing a measured ambiguity function sample for each randomly-modulated transmission pulse in a randomly-modulated pulsed Doppler radar system. The ambiguity function samples are calculated from a stored copy of the randomly-modulated transmission signal. Estimates of the uncorrelated clutter backscatter are first developed by calculating the amplitude and phase of the radar returns detected in target range and velocity cells corresponding to stationary scatterers. The stationary scatterer contribution to each target cell, computed according to the sample ambiguity function, is then subtracted to eliminate the uncorrelated noise component in the return signal for the target cell. This clutter cancellation technique does not rely on correlations between the randomly-modulated transmission signal and the clutter return signal.

Random-modulation radar signal-induced interference cancellation method and apparatus

A radar system ( ) which transmits a random noise signal. The transmitted signal is embodied as an electromagnetic signal and is directed at an object or target. The object or target reflects at least a portion of the electromagnetic signal which is returned to the radar system. An image of the electromagnetic random noise signal is stored in memory ( ) and compared with the returned modulated signal. Based on the correlation value, a determination is made regarding the object or target. In a particular implementation, the radar system is used in a target detection device (TDD) ( ) in order to determine the distance from the target or object to the device and the relative velocity of the target or object and the device. When the target or object reaches a predetermined distance and also satisfies any other system requirements, the TDD ( ) initiates a detonation signal which causes detonation of the missile or warhead.

Random noise radar target detection device

A radar system (,) which transmits a random noise signal. The transmitted signal is embodied as an electromagnetic signal and is directed at an object or target. The object or target reflects at least a portion of the electromagnetic signal which is returned to the radar system. An image of the electromagnetic random noise signal is stored in memory (,) and compared with the returned modulated signal. Based on the correlation value, a determination is made regarding the object or target. In a particular implementation, the radar system is used in a target detection device (TDD) (,) in order to determine the distance from the target or object to the device and the relative velocity of the target or object and the device. When the target or object reaches a predetermined distance and also satisfies any other system requirements, the TDD (,) initiates a detonation signal which causes detonation of the missile or warhead.

An automotive radar system for use with an automotive control system such as a collision avoidance or smart cruise control system, for example. A wide-bandwidth, random noise signal generated at an RF frequency that is transmitted by a transmitter and reflected from targets in the vicinity of the system. The random noise modulation is sampled prior to transmission in a noise source sampler and this sampled image of the transmitted noise is stored and passed through a series of delay stages that are formed in a correlator. The noise signal reflected from objects is processed by a homodyne receiver and also sampled in a receiver sampler. The noise samples from the signal return are passed to the correlator where they are cross correlated with the delayed images of the transmit noise. The output from the correlator for each unit of delay (range gate) is processed in a digital signal processor to find the range and closing velocity (Doppler frequency) of objects in the field of view. The output (range gate) of the correlator where the delay of the sampled transmit modulation equals the transmit delay of the signal transmitted from the radar system to the object and back, contains the range and closing velocity of the objects. At delays (ranges) where there are no objects to reflect the signal, the outputs of the correlator contain noise. Output signals from the digital signal processor are coupled to the automotive control system which processes the output signals to control the vehicle to avoid collision with the detected targets.

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Riverside, CA, United States of America

Alexander Niechayev