 Inverse quantizer |
| It is an object of the present invention to provide an inverse quantizing device which has a simple ... |
|
| Magnetic particles used for electrostatic latent image developer and process for producing the same |
| OF THE INVENTION The number-average particle diameter of the composite particles according to the ... |
|
| Spherical magnetic composite particles |
| It is an object of the present invention to provide spherical magnetic composite particles which ... |
|
| Synthetic resin composition |
| What is claimed is: 1. A synthetic resin composition comprising 40 to 98.5 wt. % of a synthetic ... |
|
| Polyether based preparations and the use thereof |
| 1. A preparation comprising: (A) 30 to 56 wt.-% aziridino polyethers with a cyclic polyether ... |
|
| Silicon steel sheets having low iron loss and method of producing the same |
| It is, therefore, an object of the invention to advantageously solve the aforementioned problems ... |
|
| Susceptor for heating foods in a microwave oven having metallized layer deposited on paper |
| In accordance with the present invention, a susceptor for heating a food substance in a microwave ... |
|
| Parachute apparatus having enhanced radar reflective characteristics |
| The parachute apparatus of the present invention provides enhanced radar reflective characteristics ... |
|
| Landmine locating system |
| OF THE PREFERRED EMBODIMENTS FIG. 1 represents a landmine detecting system 100. An area of the ... |
|
| Electronic avoidance configurations |
| This invention is not a single specific machine, but a basic configuration of specific surface ... |
|
|
Unlocked W-band receiver with coherent features
| Details |
Inventors: Kennedy, Thomas A.; Kirkorian, Kapriel V.; Rosen, Robert A.;
Assignee: Hughes Electronics (Los Angeles, CA)
Primary Examiner: Eldred; J. Woodrow
Assistant Examiner:
Attorney, Agent or Firm: Alkov; Leonard A., Denson-Low; Wanda K.
A coherent radar receiver that has pulse-to-pulse coherence using an unlocked voltage controlled oscillator, such as a Gunn voltage controlled oscillator. The present invention is a W-band, for example, bistatic receiver that uses a scanning sum channel antenna to scan the target, a downconverter for downconverting received alternating sum and difference pulse echoes from the bistatic illuminator to provide video signals, and processing circuits for processing the downconverted the video signals to precisely locate the null position on the target. A Fourier transform circuit, magnitude detector and a peak detection and centroid circuit are used to generate a voltage frequency control output signal that is applied to the voltage controlled oscillator or local oscillator that controls its frequency. An angle estimation algorithm is used that processes the video signals to locate the null offset from the center of a scan pattern generated by the antenna. The present invention thus provides for an inexpensive weapon receiver at W-band, for example, using an inexpensive unlocked voltage controlled oscillator. The pulse-to-pulse coherence achieved by the receiver permits precise location of a target of interest from bistatic radar returns. |
|
DETAILED DESCRIPTION To meet the above and other objectives, the present invention provides for a coherent radar receiver that has pulse-to-pulse coherence using an unlocked voltage controlled oscillator, such as a Gunn voltage controlled oscillator.
The present invention provides for an inexpensive weapon receiver at W-band, for example, using the unlocked voltage controlled oscillator.
The pulse-to-pulse coherence achieved by the radar receiver permits precise location of a target of interest from bistatic radar returns.
The present invention enhances the performance of similar noncoherent receivers with unlocked voltage controlled oscillators but that cannot be effectively employed for precise targeting.
More specifically, the present invention is a W-band bistatic receiver that comprises a scanning sum-channel, a bistatic illuminator antenna that scans a target, a downconverter for downconverting received alternating sum and difference pulse echoes to provide video signals, and processing circuits for processing downconverted video signals to precisely locate the null position on the target.
A Fourier transform circuit, magnitude detector and a peak detection and centroid circuit are used to generate a voltage frequency control output signal to an inexpensive voltage controlled oscillator (or local oscillator) that controls its frequency.
An angle estimation algorithm is used that processes the video signals to locate the null offset from the center of a scan pattern generated by the antenna.
The present invention significantly improves the target location accuracy of bistatic weapon receivers with unlocked voltage controlled oscillators.
Specifically, the present invention may be employed in a low cost and compact receiver for an inverse monopulse guidance system such as is described in U.
S.
Pat.
No.
5,473,331, entitled "Combined SAR Monopulse and Inverse Monopulse Weapon Guidance", that is assigned to the assignee of the present invention.
The present invention also may be advantageously employed in a precision adverse weather weapon system developed by the assignee of the present invention
|
| Related patents |
|
|
Differential fuse circuit and method utilized in an analog to digital converter
Other objects and advantages will be obvious, and will in part appear hereinafter and will be accomplished by the present invention which provides a differential fuse ...
|
|
|
Method and apparatus for encoding video signals in 3-D blocks without detecting image motion
One object of the present invention is to provide a coding method and a coding apparatus capable of effectively reducing redundancy of a video signal in interlaced ...
|
|
|
Manipulation of graphic structures using inverse kinematics
The invention addresses manipulation of a graphic structure (or a portion of a graphic structure) having at least two dimensions, such as the structure 200 illustrated ...
|
|
|
Instant response broadcast board system and method
The object of the present invention is to provide an instant response broadcast board method and device for viewing customers. A further object of the present invention ...
|
|
|
Closed loop countermeasure to passive direction finding and location of radar transmitters using Doppler techniques
In meeting this and other objects the invention makes use of the fact that the change in the Doppler shift the observer is attempting to measure is only, at the most, ...
|
|
|
Reflective temperature compensating microwave susceptors
OF A PREFERRED EMBODIMENT The ability of a susceptor to brown or crispen food is largely determined by the complex surface impedance of the susceptor and by changes in ...
|
|
|
Power source circuit for microwave oven
Accordingly, it is an object of the present invention to provide a power source circuit for a microwave oven wherein safety can be improved by reliably preventing the ...
|
|
|
Electroconductive elastic sponge member
It is accordingly a principal object of this invention to provide an improved electroconductive elastic sponge member having an electrical resistivity in the range of 10....
|
|
|
Molded polypropylene foam tire cores
OF THE INVENTION In that form of the present invention chosen for purposes of illustration in the drawing, FIGS. 1-4 show a tire casing, indicated generally at 10, ...
|
|
|
Process of using fine paper containing 2-oxetanone sizing agent in high speed precision converting or reprographic operations
OF THE INVENTION Alkaline sizing agents, that give levels of sizing comparable to those obtained with current AKD and ASA sizing technology, and improved handling ...
|
|
|
Radio 
