1
Gary A Naden, Robert E Rouquette, H Britton Sanderford Jr, Dale E Reiser, Charles A Hwang, Marc L Reed: Direct sequence spread spectrum method, computer-based product, apparatus and system tolerant to frequency reference offset. Sanconix, Oblon Spivak McClelland Maier & Neustadt P C, December 7, 1999: US05999561 (274 worldwide citation)

A method, apparatus, computer-based product and system employs a digital receiver (or transceiver) to receive, digitize and process a direct sequence spread spectrum signal using efficient, low-cost digital signal processing components. A radio front end portion of the receiver receives and digitize ...


2
H Britton Sanderford Jr, Robert E Rouquette, James D Arthur: Radio position determination method and apparatus. Axonn Corporation, David B Newman Jr, January 17, 1989: US04799062 (227 worldwide citation)

A method and apparatus for radio position determination is provided including an unknown position transmitter for transmitting a radio wave having compensation for multipath, a plurality of base repeaters having a synchronized pulse for time reference, for receiving the radio wave emitted by the unk ...


3
H Britton Sanderford Jr, Robert E Rouquette, Robert J Davis: Direct sequence frequency ambiguity resolving receiver. Sanconix, Oblon Spivak McClelland Maier & Neustadt P C, August 29, 2000: US06111911 (138 worldwide citation)

A system and method for receiving direct sequence spread spectrum transmissions with both chip code and frequency uncertainty including a parallel frequency acquisition technique for increasing receiver sensitivity and increasing process gain while reducing a preamble duration required for spread sp ...


4
James D Arthur, H Britton Sanderford Jr, Robert E Rouquette: Wireless alarm system. Axonn Corporation, David B Newman Jr & Associates, December 11, 1990: US04977577 (115 worldwide citation)

A wireless alarm system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and computer with a display. The spread spectrum transmitter includes an oscillator coupled to a microprocessor with chip code generation means, preamble register, address register and ...


5
H Britton Sanderford Jr: Frequency agile radio. Axonn Corporation, David Newman & Associates, December 27, 1994: US05377222 (110 worldwide citation)

A frequency agile spread spectrum radio system which uses a frequency-agile receiver that adaptively learns which frequencies to avoid as being occupied or jammed. The transmitter sends redundant transmissions on widely separated pseudo-random carrier frequencies to overcome jammed channels. A coded ...


6
H Britton Sanderford Jr, John R Souvestre: Spread spectrum alignment repositioning method. Sanconix, Burns Doane Swecker & Mathis, October 10, 1995: US05457713 (104 worldwide citation)

A method for maintaining spread spectrum chip sequence synchronization, over arbitrary time periods, without the use of traditional closed loop strategies. The technique can be accomplished entirely in software or with the addition of a minimum of electronic components. The receiver periodically for ...


7
H Britton Sanderford Jr, Robert J Davis, Robert E Rouquette: Enhanced frequency agile radio. Axonn L L C, Oblon Spivak McClelland Maier & Neustadt P C, January 1, 2002: US06335953 (104 worldwide citation)

A method utilizing intentionally generated in-band frequency harmonics to compensate for frequency error and frequency drift in a voltage controlled oscillator of a receiver, thereby eliminating the frequency synthesizer and RF divider required in conventional designs. The method includes modulating ...


8
H Britton Sanderford Jr: Frequency agile radio. Axonn Corporation, David Neuman & Associates, May 10, 1994: US05311541 (100 worldwide citation)

A frequency agile spread spectrum radio system which is capable of efficient frequency re-use and frequency sharing. The receiver adaptively learns which frequencies to avoid. The transmitter sends redundant transmissions on widely separated pseudo-random carrier frequencies to overcome jammed chann ...


9
James D Arthur, H Britton Sanderford Jr, Robert E Rouquette, Robert J Davis: Wireless alarm system. Axonn Corporation, David B Newman Jr, November 19, 1991: US05067136 (94 worldwide citation)

A wireless alarm system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and computer with a display. The spread spectrum transmitter includes an oscillator coupled to a microprocessor with chip code generation means, preamble register, address register and ...


10
H Britton Sanderford Jr, Robert J Davis, Robert E Rouquette: Enhanced frequency agile radio. Sanconix, Oblon Spivak McClelland Maier & Neustadt P C, September 16, 1997: US05668828 (92 worldwide citation)

An enhanced frequency-agile radio for avoiding undesired signal energy, based on a prediction, by scanning an available radio spectrum, measuring a receiver output, identifying an occupied portion of the available spectrum, predicting a level of undesired signal energy in a future scan, and storing ...