Raymond K Martin

US Patent:

51403323, Aug 18, 1992

Filed:

Oct 25, 1991

Appl. No.:

7/793211

Inventors:

Raymond G. Martin - Ellicott City MD
Gregory S. Hill - Columbia MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 1328

US Classification:

342202

Abstract:

A radar system is disclosed which includes a transmitter which produces a long coded radar pulse. The return of the long coded radar pulse is compressed by a long pulse compression filter to produce a short coded pulse and the short coded pulse is compressed by a short pulse compression filter to produce a return pulse for processing by an existing processor designed to process return coded pulses of a particular format. The long pulse transmitter can also transmit a short coded precursor pulse, to improve radar range coverage, along with the long coded pulse by the provision of a switching bypass device which routes the short coded pulse return signal around the long pulse compression filter.

US Patent:

41375327, Jan 30, 1979

Filed:

Apr 29, 1977

Appl. No.:

5/792279

Inventors:

John W. Taylor - Baltimore MD
Raymond G. Martin - Ellicott City MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 942
G01S 730

US Classification:

343 77

Abstract:

A low PRF pulse doppler radar system utilizing a VIP digital filter bank signal processor to suppress echoes from terrain, rain, and chaff, and pass echoes from aircraft moving at higher speeds is disclosed. Each of a plurality of VIP filters individually provides high attenuation to undesired signals over designated frequency bands, the width of which are a large fraction of 1/T. sub. av where T. sub. av is the average interpulse period. Little or no attenuation of desired signals having doppler frequencies greater than 1/T. sub. av occurs. The outputs of the plurality of filters are desensitized to prevent false alarm from clutter, and the presence of a desired radar pulse echo is determined by a comparison with a threshold level.

US Patent:

51326906, Jul 21, 1992

Filed:

Apr 18, 1991

Appl. No.:

7/687149

Inventors:

Raymond G. Martin - Ellicott City MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 1300

US Classification:

342158

Abstract:

Polystatic radar system and method for operating at relatively low power for a given coverage. The illumination power density of the transmit pattern is continuously varied as a function of the range to the receiver from each point within the receive beam coverage.

US Patent:

51012090, Mar 31, 1992

Filed:

Mar 9, 1990

Appl. No.:

7/491030

Inventors:

Raymond G. Martin - Ellicott City MD

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

G01S 1344
G01S 736

US Classification:

342152

Abstract:

In a surveillance radar, a process is disclosed which can determine the angular positions of multiple jammers with the use of a monopulse agile beam antenna. It involves collecting and processing jammer data received via a monopulse antenna, in order to determine jammer location, and to resolve two jammers within the main beam when present. A feature is the use of the ratio of the imaginary and real parts of the difference/sum ratio as a discriminant to select a subset of multiple measurement data points, from which the individual jammer angular locations can be determined, when two jammers are present, by averaging upper and lower percentiles of the real difference/sum ratio data points of that subset.

US Patent:

50669567, Nov 19, 1991

Filed:

Nov 27, 1989

Appl. No.:

7/441801

Inventors:

Raymond G. Martin - Ellicott City MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 1344
H01Q 322

US Classification:

342154

Abstract:

An azimuth-stacked radar method and apparatus of the type typically used for surveillance employs a mechanically-rotating antenna comprising horizontal end-fed rows of antenna radiating elements with phase shifter control on each row together with a monopulse elevation manifold to generate an elevation sum and difference beam pair. Additionally, this radar employs a waveform comprising multiple subpulses at different frequencies with sufficient separation between the subpulses at each frequency to spread them in azimuth to form a beam cluster and employs mechanical antenna rotation and phase-responsive elevation scanning. The scanning is accomplished in a way that will permit advantageous avoidance of ground clutter and other uninteresting radar reflectors.

US Patent:

47393319, Apr 19, 1988

Filed:

Oct 9, 1985

Appl. No.:

6/785813

Inventors:

Peter H. Pincoffs - Severna Park MD
Raymond G. Martin - Ellicott City MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 1332

US Classification:

342175

Abstract:

A continuous wave radar system arrangement for improving the dynamic range of the radar receiver. The transmitted carrier signal is frequency modulated by a periodic sawtooth waveform causing a predetermined peak frequency shift. The radar receiver includes a plurality of separate receiving channels each selective to a small portion of the transmitted bandwidth. As the sawtooth modulation causes the carrier signal to sweep in frequency, the received leakage and clutter signals in the selective receiving channels are blocked momentarily and individually in each channel. The outputs of the separate receiving channels are combined to form a composite signal of the echo returns. Gaussian filters with quadratic phase compensation are used to provide the selectivity of the receiving channels.

US Patent:

46188649, Oct 21, 1986

Filed:

Jan 31, 1984

Appl. No.:

6/575642

Inventors:

Raymond G. Martin - Ellicott City MD
James H. Mims - Millersville MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

G01S 1352

US Classification:

342162

Abstract:

In a radar operating in a moving target indication (MTI) mode with frequency diversity by transmitting N+1 pulse bursts and receiving echo signalling therefrom, a radar channel is included for doppler processing the received N+1 pulse echo signal bursts. Each pulse of the same burst envelopes a fixed carrier frequency. The radar is operative to change the transmitted carrier frequency from one pulse burst to another. The radar channel comprises an MTI filter operative as two different orthogonal MTI filters, each having a frequency response similar to an N-pulse MTI filter, to process functionally in parallel a received N+1 pulse echo signal burst to generate a filter signal from each functional filter. Also included is apparatus for combining the two filter signals non-coherently to generate a composite signal corresponding to the N+1 pulse echo signal burst for target detection. The radar channel is operative to process N+1 pulse bursts with either fixed or variable interpulse periods.

US Patent:

52393011, Aug 24, 1993

Filed:

May 26, 1989

Appl. No.:

7/358294

Inventors:

Raymond G. Martin - Ellicott City MD

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

H01Q 322

US Classification:

342375

Abstract:

A phase/phase/frequency-scan radar apparatus having multiple-beam search and single-beam track capabilities, using a single array antenna employing a novel combination of phase/phase scan in two dimensions together with frequency-scan. Generally, the additional frequency scan capability need be used in one dimension only, preferably azimuth, but the concept could readily be extended to two-dimensional add-on frequency scan if desired.