Harold R Ward

US Patent:

40991822, Jul 4, 1978

Filed:

Jan 17, 1977

Appl. No.:

5/760196

Inventors:

Harold R. Ward - Bedford MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 9233

US Classification:

343 172PC

Abstract:

A signal receiver employing constant false alarm rate (CFAR) circuitry is disclosed. The CFAR circuitry includes a dispersive delay line for stretching received echo signals, means for limiting the stretched echo signals and an inverse dispersive delay line for finally processing the stretched and limited echo signals. With delay lines of proper characteristics, the just-outlined processing of echo signals results in reconstituted signals, the amplitude of each one of such reconstituted signals being indicative of the source of a corresponding echo signal.

US Patent:

49610759, Oct 2, 1990

Filed:

Sep 11, 1989

Appl. No.:

7/405789

Inventors:

Harold R. Ward - Bedford MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 346

US Classification:

342140

Abstract:

A radar system for determining not only the azimuth and range of a target but also the target height over a predetermined range of elevation angles has separate receiving and signal processing channels coupled to a dual beam antenna for processing signals returned from a single target. The output of each signal processor is coupled to a height processor which divides the sum of the received signals into the difference of the two signals. The resulting ratio is used to access a look-up table to identify the elevation angle associated with the ratio from which the height of the target is calculated. The look-up table includes correction values to compensate for the antenna pattern nonlinearity.

US Patent:

44881541, Dec 11, 1984

Filed:

Mar 25, 1982

Appl. No.:

6/361668

Inventors:

Harold R. Ward - Bedford MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 1352

US Classification:

343 9R

Abstract:

A moving target indicator system in which quadrature components of each range cell of returned target reflections are produced by phase comparison with the transmitted signals and compared by weighting three successive returns to obtain moving target differences for display.

US Patent:

49318004, Jun 5, 1990

Filed:

May 12, 1989

Appl. No.:

7/351004

Inventors:

Harold R. Ward - Bedford MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 13526

US Classification:

342162

Abstract:

A moving target detector (MTD) in a radar system uses corrected weighting coefficients to compensate for pulse stagger effect on transmitted pulses. Transmitted pulses are sampled when the radar is switched to a test mode for determining a correction factor which is used to calculate the corrected weighting coefficients. The radar return signals are processed in the MTD by a finite impulse response (FIR) filter using the stored corrected weighting coefficients calculated for each sequence of transmitted pulses including block stagger and pulse stagger sequences.