| Variable Phase Sine Wave Generator for Active Phased Arrays. |
06 JUN 1995 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | A waveform generator is provided for generating a high frequency waveform. A pulse generator provides a pulse train at a low frequency. A pulse converter converts the pulse train into an alternatingly positive and negative groups of pulses. A bandpass filter passes the alternatingly positive and negative groups of pulses in a frequency band centered at the high frequency to output the generated waveform at the high frequency. When the ... |
|
| Phase Shifter for Directly Sampled Bandpass Signals. |
25 APR 1995 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A phase shifter for shifting the phase of directly sampled bandpass signals without having to convert to complex (I,Q) form is disclosed. An application requiring a plurality of appropriately phase shifted signals is a phased array antenna. In the operation of an exemplary phase shifter, a sequence of directly sampled data is passed into an exemplary three-stage storage unit to sequentially store r(n+1), r(n) and r(n-1) data samples. The r(n) ... |
|
| Communications System Using a Sharply Bandlimited Keying Waveform. |
31 MAR 1995 |
31 pages |
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | It is the object of this invention to transform a communications sequence in a communications system into an analog signal which is spectrally confined to the band available for the transmission within a band limited communications channel without compromising communication accuracy. Another object of this invention is to improve spectral confinement thereby allowing closer channel spacing and better electromagnetic compatibility among radar, ... |
|
| Phase Shifter for Directly Sampled Bandpass Signals. |
31 MAR 1994 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A phase shifter is comprised of a filter for shifting the phase of directly sampled bandpass signals without having to convert to complex (I,Q) form. An application requiring a plurality of appropriately phase shifted signals is a phased array antenna. In the operation of the filter, a sequence of directly sampled data is passed into an exemplary three-stage storage unit to sequentially store r sub n+1, r sub and r ... |
|
| Layered Parallel Interface for an Active Antenna Array. |
21 SEP 1993 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A transmit/receive layer is provided adjacent to an array of antenna elements. The transmit/receive layer has an array of transmit receive modules, each module associated with one of the antenna elements. An analog to digital converter and a digital to optical converter of one of the modules couple an RF signal from the associated antenna element to optical fibers. An optical to RF converter in each of the modules converts ... |
|
| Focal Plane Antenna Array for Millimeter Waves. |
17 AUG 1993 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A millimeter wave imaging system receives millimeter wave radiation and provides video imaging signals based thereon. The system comprises an imaging lens for receiving incoming radiation; a focal plane antenna array disposed at the focal plane of the lens on which radiation received by the lens is focussed; and signal processing and display circuitry for processing the output of the antenna array and for producing and displaying corresponding video imaging ... |
|
| Layered Parallel Interface for an Active Antenna Array. |
24 JUL 1992 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A transmit/receive layer is provided adjacent to an array of antenna elements. The transmit/receive layer has an array of transmit receive modules, each module associated with one of the antenna elements. An analog to digital converter and a digital to optical converter of one of the modules couple an RF signal from the associated antenna element to optical fibers. An optical of RF converter in each of the modules converts ... |
|
| Method and Apparatus for Increasing a Radar's Range With Improved Scan-to-Scan Integration of Doppler Filtered Signals. |
21 APR 1992 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Method and apparatus for improving detection ranges of a pulsed radar system wherein electromagnetic return signal data in range cell order is doppler filtered, digitized and stored in doppler memory channels over multiple scans of an azimuth. ne digital doppler data in each doppler memory channel is scan-to-scan integrated over a predetermined number of scans to produce target displays for each possible velocity. The target displays are stored in a ... |
|
| Focal Plane Antenna Array for Millimeter Waves. |
29 JUN 1989 |
|
| Authors:
William M. Waters; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A millimeter wave imaging system receives millimeter wave radiation and provides video imaging signals based thereon. The system comprises an imaging lens for receiving incoming radiation; a focal plane antenna array disposed at the focal plane of the lens on which radiation received by the lens is focussed; and signal processing and display circuitry for processing the output of the antenna array and for producing and displaying corresponding video imaging ... |
|
| RADAR IMAGING. |
JUL 1967 |
|
| Authors:
William M. Waters; Andrew Eikenburg; ADVANCED TECHNOLOGY CORP TIMONIUM MD
|
| The report describes experiments with an electronically scanned X-band array employed as the receiving antenna of an imaging radar. Planar and solid targets were uniformly illuminated from a separate transmitting antenna and the resulting scatter was intercepted by 128 horn antennas unequally spaced over a 9 foot aperture. The 128 received signals were processed electronically to provide a complete scan of a 30 deg x 30 deg field every 10 ... |
|
Reports by Author
