Martin E Richmond

US Patent:

6420992, Jul 16, 2002

Filed:

Aug 26, 1975

Appl. No.:

05/609454

Inventors:

Martin R. Richmond - Lexington MA 02173

International Classification:

G01S 738

US Classification:

342 14, 342 13, 342194, 342204

Abstract:

A method and apparatus for jamming radar and other electromagnetic signals is disclosed in which the jammer includes a single port, keyed primed oscillator which is primed with the low level signal received at its antenna. In one embodiment the priming signal is gradually shifted in frequency to introduce a false doppler and is then injected into the tank circuit of the oscillator which is rapidly turned on and off (keyed) to produce a rapidly pulsed signal which tracks the frequency of the shifted priming signal. In this embodiment the oscillator keying unit is itself keyed to modulate the output signal of the oscillator to provide false bearing information. In another embodiment, the priming signal is injected directly into the tank circuit of the oscillator and the frequency of the output signal from the oscillator is varied to induce false doppler information. In both embodiments the pulsed signal from the oscillator is detected as a CW signal. The jammer also has a multiple threat capability in which simultaneously arriving signals from different sources result in a jammer output at each of the different frequencies of the incoming signals with sufficient jamming power at each frequency.

US Patent:

6420995, Jul 16, 2002

Filed:

Apr 5, 1965

Appl. No.:

04/446144

Inventors:

Martin R. Richmond - Belmont MA
Morton E. Goulder - Hollis NH

Assignee:

Systems Information and Electronic Systems Integration, Inc. - Nashua NH

International Classification:

G01S 1378

US Classification:

342 45, 342 13, 342 17, 342 19, 342 82, 342 85

Abstract:

A silent radar system which detects a target and its position without the countermeasure operator located at the target being able to detect the presence of the radar. The silent radar operates by transmitting signals with specific characteristics which allow optimum processing by the radar while taking advantage of the limitations inherent in typical signal receiving equipment. The silent radar transmits low energy per cycle signals which are wideband, purely random noise, e. g. spread spectrum signals.

US Patent:

6429800, Aug 6, 2002

Filed:

Aug 26, 1975

Appl. No.:

05/609452

Inventors:

Martin R. Richmond - Lexington MA

Assignee:

BAE Systems Information and Electronic Systems Integration, Inc. - Nashua NH

International Classification:

G01S 738

US Classification:

342 14, 342 15

Abstract:

An expendable jammer is ejected as a decoy from a target in which the jammer includes a single port, keyed primed oscillator which is primed with the low level signal received at its antenna. The priming signal is injected directly into the tank circuit of the oscillator which is rapidly turned on and off (keyed) to produce a rapidly pulsed signal which tracks the frequency of the priming signal. The resultant signal from the oscillator is transmitted back to the receiving section of the radar initiating the signal in such a manner that the receiver cannot distinguish the individual pulses of returned energy due to the high PRF of the returned signal. Thus the signal from the jammer is detected as a CW signal. The expendable jammer also has a multiple threat capability in which simultaneously arriving signals from different sources result in a jammer output at each of the different frequencies of the incoming signals with sufficient jamming power at each frequency.

US Patent:

8576108, Nov 5, 2013

Filed:

Sep 22, 1980

Appl. No.:

06/189274

Inventors:

Martin R. Richmond - Lexington MA, US

Assignee:

BAE Systems Information and Electronic Systems Integration Inc. - Nashua NH

International Classification:

G01S 7/38

US Classification:

342 9, 342 13

Abstract:

In one embodiment, a passive expendable decoy for an aircraft is provided by ejecting passive radiators from the aircraft along a transmission line trailing from the aircraft and excited by a jammer on the aircraft, such that the radiators accelerate under aerodynamic drag forces to the end of the transmission line and couple energy from the transmission line to free space. This provides angular deception to a tracking radar or homing missile since the point of radiation along the transmission line is determined by the instantaneous position of the expendable radiating element.

US Patent:

46466444, Mar 3, 1987

Filed:

Apr 9, 1984

Appl. No.:

6/597943

Inventors:

Martin R. Richmond - Lexington MA
Mark A. Hayner - Manchester NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

F42B 502

US Classification:

102530

Abstract:

A pneumatic time delay valve primarily adapted for use in the ejection system of electronic or optical countermeasure devices and the like wherein an explosive squib is employed to create a momentary charge of high pressure gas used to depress the firing pin on the device to activate the device and also to push the device out of an ejection tube. The invention comprises means for splitting the pressurized gas into a first conduit communicating with the firing pin and a second conduit communicating with the device to apply the ejection pressure thereon and a time delay valve disposed within the second conduit for delaying the application of the gas to the device. During the time delay period, a piston is forced down a cylindrical bore forcing metering fluid through an orifice. At the end of the time delay period, the metering fluid is allowed to bypass the piston, causing the piston to move rapidly to open an outlet port putting the pressurized gas virtually instantaneously in communication with the device to force it out of the launch tube.

US Patent:

40218031, May 3, 1977

Filed:

Jan 30, 1952

Appl. No.:

3/268976

Inventors:

Martin R. Richmond - Watertown MA
William R. Hutchins - Waltham MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

F42C 1304

US Classification:

343 7PF

Abstract:

This invention relates to a proximity sensing apparatus for energizing a control circuit whenever the distance between two objects moving relative to one another at an angle other than 180. degree. becomes a minimum, and more particularly, relates to a proximity sensing apparatus operating on the zero doppler principle for energizing a detonation circuit in a missile whenever said missile passes closest to a target.

US Patent:

41491238, Apr 10, 1979

Filed:

Jun 30, 1978

Appl. No.:

5/920928

Inventors:

Martin R. Richmond - Lexington MA
Alfred J. Cann - Wilton NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

H03K 902
H03K 508

US Classification:

328168

Abstract:

Attenuation of a signal is achieved by biphase modulating the signal with an asymmetrical duty factor rectangular wave. In one embodiment of the invention an input signal is applied to a phase reversal switch having as its second input thereto an asymmetrical duty factor rectangular wave.

US Patent:

47169303, Jan 5, 1988

Filed:

Jul 18, 1986

Appl. No.:

6/889971

Inventors:

Martin R. Richmond - Lexington MA
Mark A. Hayner - Manchester NH

Assignee:

Sanders Associates, Inc. - Nashua NH

International Classification:

F16K 2110

US Classification:

1375145

Abstract:

A pneumatic time delay valve primarily adapted for use in the ejection system of electronic or optical countermeasure devices and the like wherein an explosive squib is employed to create a momentary charge of high pressure gas used to depress the firing pin on the device to activate the device and also to push the device out of an ejection tube. The invention comprises means for splitting the pressurized gas into a first conduit communicating with the firing pin and a second conduit communicating with the device to apply the ejection pressure thereon and a time delay valve disposed within the second conduit for delaying the application of the gas to the device. During the time delay period, a piston is forced down a cylindrical bore forcing metering fluid through an orifice. At the end of the time delay period, the metering fluid is allowed to bypass the piston, causing the piston to move rapidly to open an outlet port putting the pressurized gas virtually instantaneously in communication with the device to force it out of the launch tube.