The Boeing Company

Other

Raytheon Company

The Directv Group, Inc.

Eric B Jensen

Henry McCord

David A Jones

Paul A Jensen

James M Knight

David Arthur Whelan

Gerard L Rafanelli

Mark J Rehfield

Susan B Mount

Stephen K Johnson

Bernard Schweitzer

Marilyn A Sperka

David Lynch, Jr

Steve A Hallman

Technologies for detecting a passive object through the use of frequency diversity to find at least a resonant peak are disclosed. For example, a radar system may illuminate a suspect area with a pulsed radio wave based on a large number of frequency bands and based on parameters associated with the passive object. The reflected radio wave may be processed to generate synthetic aperture radar (SAR) maps associated with the frequency bands. The SAR maps may be analyzed and compared to determine large deviation amplitudes that may indicate a location of the passive object.

Using frequency diversity to detect objects

An invention is provided for determining the azimuth pointing angle of a moving monopulse antenna. Pulses of energy are broadcast at the surface of a planetary body. Reflected signals are received from the surface of the planetary body using a plurality of feeds. A monopulse ratio is then calculated based on a sum pattern and a difference pattern. The sum pattern is based on the sum of the reflected signals received using the feeds, and the difference pattern is based on a difference of the reflected signals received using the feeds. An azimuth pointing angle of a monopulse antenna is then calculated using the monopulse ratio.

System and method for estimating the azimuth pointing angle of a moving monopulse antenna

A radar surveillance system includes a plurality of satellites a plurality of medium earth orbit satellites to provide continuous, long dwell coverage of a region of interest. Each satellite has an antenna having a main reflector and a subreflector electromagnetically coupled to the main reflector. A phased array generates multiple electromagnetic beams positioned so the electromagnetic beams reflect from the subreflector onto said main reflector. The system may be used in determining slow moving targets using a combination of monopulse anomaly and target spectral width measurements. The system also performs synthetic aperture radar imagery and focussed area fast moving target detection using alternating slope linear frequency modulated pulses. The plurality of medium Earth orbit satellites include a self-contained communications system consisting of high bandwidth self-relay crosslinks, high bandwidth downlink, and direct broadcast downlinks for processed data.

Medium earth orbit satellite surveillance system and antenna configuration therefore

Satellite surveillance system and method

A pulse doppler radar system simultaneously operating monostatically and bistatically. A pair of radar unit operate monostatically transmitting a radio frequency (RF) energy signal and receiving a RF return from the RF energy signal. In addition, simultaneously, one unit operates as a receiver receiving a bistatic return from the other. Information from the bistatic return is combined with information from monostatic returns to locate individual targets.

Radar system having simultaneous monostatic and bistatic mode of operation

A spinning strip aperture imaging radiometer sensor system and data processing methods for detecting moving objects derived from a plurality of image frames acquired by a strip aperture imaging sensor. A moving object in any individual image frame results in a motion smear signature in the total synthesized image. The motion smear signature is processed to detect the moving objects. One embodiment of the system comprises a rotating strip aperture telescope, a two dimensional detector array that detects images in the telescope's focal plane, a rotation compensation device that prevents rotational smear during integration time of detectors of the array, a signal processor that records a plurality of image frames of a scene imaged by the telescope as it rotates around its optical axis, and that implements method(s) for detecting the moving objects present in the recorded images. A hierarchy of moving object detection processors and methods,is disclosed that includes spatial, temporal, spatial frequency, and temporal frequency domain detection processors, and is compatible with multi-spectral background rejection techniques. Selection of the appropriate processing procedure and method depends upon the scenario, and the effective signal to noise ratio characteristics of the moving object.

Moving object and transient event detection using rotation strip aperture image measurements

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Hermosa Beach, CA, United States of America

Eric B Jensen