Other

General Electric Company

The Secretary of State for Defence in Her Britannic Majesty's Government

Deutsche Forschungsanstalt Fur Luft-und Raumfahrt E.v.

Anthony L Freeman

Christopher J Oliver

Ian P Finley

Richard G White

James W Wood

Ian A Ward

Herwig Ttl

Manfred Zink

Shaun Quegan

David Blacknell

In an airborne SAR system for determining the topography of a terrain, two complete, correlated SAR images with different amplitude modulation in the cross-track direction are obtained and recorded by switching of two antenna patterns which can be generated by means of a monopulse antenna. The desired terrain information is extracted from the amplitude relationship of the two SAR images. It is furthermore possible to extract the terrain information from polarimetric SAR data via crosstalk parameters.

Airborne SAR system for determining the topography of a terrain

In a synthetic aperture radar system, information concerning the radar reflectivity of a point on the ground is placed in an image at an azimuthal (cross-range) position which corresponds to the position of zero Doppler frequency shift of the received signal, under the assumption that the antenna has followed a straight line trajectory. In practice, the antenna trajectory will undergo small deviations about this straight line path which are not taken into account in the azimuth processing and which, consequently, cause incorrect azimuthal positioning in the image of the information concerning a point target on the ground. The invention uses the value of the slope of the frequency modulation of the received signal, calculated by means of an autofocus procedure, to determine the intercept of this frequency modulation at successive azimuth positions. This true intercept value is then incorporated in the azimuth processing, instead of the assumed intercept of the frequency modulation, allowing imagery which is free from azimuthal positioning errors to be produced.

Synthetic aperture radar systems

An attachment for bicycles which allows a wheeled shopping cart to be towed behind a conventional bicycle with universal pivoting and turning means to take care of uneven terrain, cornering and other movements which a vehicle-towed device may be subject to.

Bicycle cart attachment

A bicycle is provided with safety apparatus consisting of a plurality of battery powered lights attached to the spokes of the bicycle wheels. The wheels are covered on each side with an apertured cover attached to the bicycle frame. Rotation of the wheels causes the lights to pass the apertures and be visible as flashing lights to the sides.

Vehicle signal light

Growing community of inventors

Washington, DC, United States of America

Anthony L Freeman