| Patent Number |
Title Of Patent |
Date Issued |
| 6834991 |
Radiometer with programmable noise source calibration |
December 28, 2004 |
| Apparatus and a method for radiometric temperature measurement comprises a radiometer receiver coupled to an antenna/calibration switch that has coupled thereto a brightness temperature signal. A driver coupled to the antenna/calibration switch controls the operation of the switch betwee |
| 6439763 |
Variable microwave cold/warm noise source |
August 27, 2002 |
| A radiometer calibrating system utilizes an adjustable noise source for calibrating a radiometer. The noise source includes a transistor configured as a noise equivalent circuit having a gate port, drain port and source port. A source inductance providing series feedback for the nois |
| 6217210 |
Variable microwave cold/warm noise source |
April 17, 2001 |
| A radiometer calibrating system utilizes an adjustable noise source for calibrating a radiometer. The noise source includes a transistor configured as a noise equivalent circuit having a gate port, drain port and source port. A source inductance providing series feedback for the nois |
| 6137440 |
Microwave active solid state cold/warm noise source |
October 24, 2000 |
| A microwave active noise source and method used for calibrating a radiometer includes a transistor configured as a noise equivalent model having a gate port, drain port and source port. During calibration of the radiometer the drain port is terminated and a bias circuit applies DC bias |
| 4665401 |
Millimeter wave length guidance system |
May 12, 1987 |
| A high frequency target seeking device, using a stabilized reflector antenna, performs range search and tracking functions and target angle search and tracking functions. A technique is provided for target range discrimination using several narrow band i.f. filters, also thereby impr |
| 4551728 |
Apparatus for rapid switch conical scan feed |
November 5, 1985 |
| An apparatus for rapidly starting and stopping a conical scan antenna beam in which a feed rotating about a centerline provides a non-conical scan antenna beam during a search mode. When a target is detected a solenoid moves an actuator pin which displaces one end of the feed from the |
| 4338602 |
Semi-active guidance system |
July 6, 1982 |
| An air-to-ground tracking guidance system wherein a tracker/illuminator and a terminally guided seeker are utilized. Target track is initially established by the tracker/illuminator which also provides a target illuminating signal. Semi-active tracking utilizing the reflected target |
| 4292638 |
Augmented radiometric system |
September 29, 1981 |
| An improved microwave radiometric system features the employment of incoherent noise illumination of a selected target for improving the measured radiometric temperature contrast between the target and its spatial background and for increasing the distance at which such a target may |
| 4200871 |
Acquisition system for continuous-wave frequency modulation object detector |
April 29, 1980 |
| A continuous-wave frequency-modulation active radiometric target seeking device performs search, acquisition, and tracking functions. A technique is provided for target range discrimination and recognition using a pair of narrow band i.f. filters also improving both signal-to-clutter rat |
| 4160251 |
Hybrid dual mode radiometric system |
July 3, 1979 |
| An improved high frequency radiometric system features time shared passive and active modes of operation for correlation of active and passive signal returns. The processed, normalized, and stored passive signals are subtracted from similarly treated active signals to suppress the effect |
| 4115776 |
Adaptive gain control for radiometric target tracking system |
September 19, 1978 |
| The improved radiometric target seeking system incorporates automatic gain control features including phase tracking automatic gain and automatic gain scan amplitude controls in a system which is basically a dual-axis, gimballed, conical-scan radiometric sensor designed to operate in eit |
