Patents by Inventor Richard H. Sherman

Richard H. Sherman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7076065
    Abstract: Systems and methods for protecting privacy in transmitting an analog information signal. The present invention combines the information signal with an analog random signal generated by a chaotic circuit and transmits the signal. The received signal is synchronized using a receiving chaotic circuit. The received signal is demodulated using a synchronized replica of the analog random signal. The information signal is recovered since the product of the random signals generated in the transmitter and in the receiver, is unity. Techniques used in the present invention for generating chaos, synchronization, and signal recovery are also disclosed.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: July 11, 2006
    Assignee: Lockheed Martin Corporation
    Inventors: Richard H. Sherman, Chamroenu Kchao, Billy Pettijohn
  • Publication number: 20020176574
    Abstract: Systems and methods for protecting privacy in transmitting an analog information signal. The present invention combines the information signal with an analog random signal generated by a chaotic circuit and transmits the signal. The received signal is synchronized using a receiving chaotic circuit. The received signal is demodulated using a synchronized replica of the analog random signal. The information signal is recovered since the product of the random signals generated in the transmitter and in the receiver, is unity. Techniques used in the present invention for generating chaos, synchronization, and signal recovery are also disclosed.
    Type: Application
    Filed: May 11, 2001
    Publication date: November 28, 2002
    Inventors: Richard H. Sherman, Chamroeun Kchao, Billy Pettijohn
  • Patent number: 6463279
    Abstract: A method and apparatus (system) for providing forward-link channel-frequency allocation for multiple-satellite cellular communications networks is disclosed. The system has a centralized ground-operations control center that provides bi-weekly minute-by-minute allocation plans for geographically-defined service areas. This enables each service area to set its diversity policy in accordance with the requirements of the government regulators and customer preferences within the service area. The system has a user model having a frequency re-use pattern, a channel allocation model for modelling the power allocated to each channel, and a gateway channel model for allocating channels in accordance with the user model and the channel allocation model. The allocation is made for each satellite of the plurality of satellites. The traffic allocation induces an operating frequency for each of the one or more links in each satellite of the plurality of satellites.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: October 8, 2002
    Assignee: Globalstar L.P.
    Inventors: Richard H. Sherman, Theodore F. Driggers
  • Patent number: 6091933
    Abstract: A satellite communications system is described. The system includes a plurality of satellites, each of which transmits one or more forward links containing traffic to one or more terrestrial users. Each forward link of each of the satellites has a maximum radiation limit. At least one terrestrial user is capable of concurrently receiving at least two of the forward links. The concurrently received forward links redundantly contain the traffic addressed to the user. A computing center has a traffic controller for allocating the traffic to the satellites using gateways. The traffic controller includes a fading model descriptive of fading characteristics for each of the one or more forward links; a link performance model descriptive of losses in each of the forward links; and a power allocation model for computing a traffic allocation for each satellite of the constellation of satellites. The traffic allocation causes transmitted satellite power to be less than the maximum radiation limit for each link.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: July 18, 2000
    Assignee: Globalstar L.P.
    Inventors: Richard H. Sherman, Vijaya Gallagher, John J. Y. Huang
  • Patent number: 6081710
    Abstract: A satellite communications system operative with at least one existing terrestrial communication system for carrying traffic is described. The communication system has a plurality of satellites in earth orbits, each satellite including a battery for sourcing electrical energy. The battery has energy sourcing limits. Gateways, bidirectionally linked to the plurality of satellites are also provided. A computing center, linked to the gateways, has a traffic control means for allocating traffic to the gateways. The traffic control means has three parts a power demand model for computing a first traffic allocation of traffic for each satellite; a satellite battery performance model descriptive of the energy sourcing limits of the on-board batteries; and a control law for applying weights to the first traffic allocation by using the battery performance model to obtain a second traffic allocation for each satellite.
    Type: Grant
    Filed: July 10, 1997
    Date of Patent: June 27, 2000
    Assignee: Globalstar L.P.
    Inventors: Richard H. Sherman, Stephen Boyd, Delmer R. Schneider, Jr.
  • Patent number: 6021309
    Abstract: A method and apparatus (system) for providing forward-link channel-frequency allocation for multiple-satellite cellular communications networks is disclosed. The system has a centralized ground-operations control center that provides bi-weekly minute-by-minute allocation plans for geographically-defined service areas. This enables each service area to set its diversity policy in accordance with the requirements of the government regulators and customer preferences within the service area. The system has a user model having a frequency re-use pattern, a channel allocation model for modelling the power allocated to each channel, and a gateway channel model for allocating channels in accordance with the user model and the channel allocation model. The allocation is made for each satellite of the plurality of satellites. The traffic allocation induces an operating frequency for each of the one or more links in each satellite of the plurality of satellites.
    Type: Grant
    Filed: May 22, 1997
    Date of Patent: February 1, 2000
    Assignee: Globalstar L.P.
    Inventors: Richard H. Sherman, Theodore F. Driggers
  • Patent number: 5075884
    Abstract: A computer workstation having a window output display for potential use in security-sensitive environments provides multilevel security by physical isolation of processes in predefined security levels, each process or like-classified group of processes is displayed only through a suitably labeled window, access to the window requiring access through a previously security qualified physical signal path. The invention does not compromise security by mixing a software-based security environment with other untested software. All security is hardware-based.
    Type: Grant
    Filed: December 23, 1987
    Date of Patent: December 24, 1991
    Assignee: Loral Aerospace Corp.
    Inventors: Richard H. Sherman, George W. Dinolt, Frank Hubbard
  • Patent number: 4550402
    Abstract: A data communication system for providing data transmission between a plurality of individually addressable local computer networks, by utilizing single node switching across a common passive bus medium. The passive bus medium is characterized as having a plurality of separate conductors of limited length that are each commonly connected to individual bus interface circuits for each local computer network. Each bus interface circuit has a number of dedicated address data ports, message data ports and control ports that are connected to separate dedicated conductors of the passive bus medium for transmitting data to and receiving data from other local computer networks. Each message transmission of data on the passive bus medium is divided into a number of mini-packets each of which contain a number of parallely transmitted bits corresponding to the number of dedicated address and message conductors in the passive bus medium.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: October 29, 1985
    Assignee: Ford Motor Company
    Inventors: Melvin G. Gable, Richard H. Sherman, Fumin Yuan
  • Patent number: 4481641
    Abstract: A coaxial cable coupler that provides a low impedance through conductor for a passive coaxial transmission cable and a high impedance tap to periodic transmission means and receiver means. The tap connection is a removable connection that is formed by a resilient electrical conductor compressed between exposed portions of the main transmission through conductor and an exposed tap conductor interconnecting the high impedance networks of the transmission means and the receiver means.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: November 6, 1984
    Assignee: Ford Motor Company
    Inventors: Melvin G. Gable, Richard H. Sherman
  • Patent number: 4284976
    Abstract: A plurality of transceivers frequently share a common communication medium or radio frequency channel. A broadcast channel can support only a limited number of transceivers. At some point, the shared channel will become so busy that additional transceivers will divide up more of an already inadequate bandwidth. To reduce the traffic, a broadcast channel is split into separate segments. A segment interface apparatus is used to couple two broadcast segments together. A hierarchical address is employed in the header of each packet transmitted on the medium. The segment interface apparatus compares fields in the header with that of internal registers to determine if the packet should be repeated on the other broadcast segment. An access level within the packet is decremented by the segment interface to control the number of times a packet is repeated.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: August 18, 1981
    Assignee: Ford Motor Company
    Inventors: Melvin G. Gable, Richard H. Sherman
  • Patent number: 4271507
    Abstract: The Local Network Architecture (LNA) is an organization of a data communication network where the control and access to the communication channel is handled local to each user device interface. The device interface (Local Netowrk Architecture Interface or LNAI) is an electronic module which interfaces a user with the LNA communication network. This device adapter contains both a network port and a user interface port. This interface accepts user data and fragments it into data packets for shipment over a shared communication medium which is connected to the network port. A communication microprocessor is used to implement the functions of data buffering, routing, sequencing, flow control, acknowledging and error checking of data. Such distributed control eliminates the need for messages in the network to be forwarded to a message flow control process or computer station.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: June 2, 1981
    Assignee: Ford Motor Company
    Inventors: Melvin G. Gable, Richard H. Sherman, Vadivelu Jeyabalan
  • Patent number: 4255742
    Abstract: An encoder of a transmitter converts digital data or analog signal information into an encoded sequence or waveform required by a communication channel. If a plurality of transmitters are to share a common channel or medium, then the correlation properties of the encoded signal are important. The encoding apparatus should employ a code which is not very susceptible to noise, yet will permit the detection of multiple transmissions of similar spectrum signals. The apparatus disclosed in this specification is concerned with a binary digital information encoder whose input is either a "zero" or "one" state. The encoder generates a ternary code sequence for encoding one binary input state with the sequence + 1,+1,0,0,-1,-1 and the other binary input state with the sequence represented by +1,0,+1,-1,0,-1.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: March 10, 1981
    Assignee: Ford Motor Company
    Inventors: Melvin G. Gable, Richard H. Sherman
  • Patent number: 4234952
    Abstract: An apparatus for enabling communications between two or more transceivers when a plurality of transceivers share a common communication medium or channel. The geographical locations of the transceivers are such that the propagation delay between any source to destination pair is relatively a small function of the transmission duration or packet time. In order to prevent two or more transceivers from simultaneously transmitting over the common medium, each transceiver requires a control apparatus. The simultaneous transmission by two or more transceivers is not very likely due to different start times. However, if such start times differ by less than the propagation delay between the transceivers then interference will result. Hence the control apparatus includes a means of resolving such contention interferences by providing a retransmission delay to govern the transmission.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: November 18, 1980
    Assignee: Ford Motor Company
    Inventors: Melvin G. Gable, Richard H. Sherman