Abstract: A system and methods for location authentication are presented. An estimated server signal is estimated based on a generated known code signal, and a client received satellite signal is received from a client device. The client received satellite signal is compared to the estimated server signal to provide a comparison result.

Abstract: A system and methods for location authentication are presented. An estimated server signal is estimated based on a generated known code signal, and a client received satellite signal is received from a client device. The client received satellite signal is compared to the estimated server signal to provide a comparison result.

Abstract: A system and methods for location authentication are presented. An estimated server signal is estimated based on a generated known code signal, and a client received satellite signal is received from a client device. The client received satellite signal is compared to the estimated server signal to provide a comparison result.

Abstract: A method and system are disclosed for providing an estimate of a location of a user receiver device. The method and system involve emitting from at least one vehicle at least one spot beam on Earth, and receiving with the user receiver device a signal from at least one spot beam. In one or more embodiments, at least one vehicle may be a satellite and/or a pseudolite. The method and system further involve calculating with the user receiver device the estimate of the location of the user receiver device according to the user receiver device's location within at least one spot beam. In some embodiments, when the user receiver device receives signals from at least two spot beams, the user receiver device calculates the estimate of the location of the user receiver device to be located in the center of the intersection of at least two spot beams.

Abstract: A system and methods for time and/or location authentication are presented. A hash value is received from a client device and a hash value receiving time of the received hash value is stored. A data block is received after receiving the hash value is received, the received data block comprising alleged transmission signal data. A computed hash value of the received data block is computed, and an estimated transmission signal client receiving time by the client is calculated based on the alleged transmission signal data. A timely possession of the received data block by the client device is authenticated based on a comparison of the computed hash value to the received hash value and a comparison of the hash value receiving time to the estimated transmission signal client receiving time.

Abstract: A system and methods for location authentication are presented. An estimated server signal is estimated based on a generated known code signal, and a client received satellite signal is received from a client device. The client received satellite signal is compared to the estimated server signal to provide a comparison result.

Abstract: A system and methods for location authentication are presented. An estimated server signal is estimated based on a generated known code signal, and a client received satellite signal is received from a client device. The client received satellite signal is compared to the estimated server signal to provide a comparison result.

Abstract: A system and methods for location authentication are presented. An estimated server signal is estimated based on a generated known code signal, and a client received satellite signal is received from a client device. The client received satellite signal is compared to the estimated server signal to provide a comparison result.

Abstract: A system and methods for time and/or location authentication are presented. A hash value is received from a client device and a hash value receiving time of the received hash value is stored. A data block is received after receiving the hash value is received, the received data block comprising alleged transmission signal data. A computed hash value of the received data block is computed, and an estimated transmission signal client receiving time by the client is calculated based on the alleged transmission signal data. A timely possession of the received data block by the client device is authenticated based on a comparison of the computed hash value to the received hash value and a comparison of the hash value receiving time to the estimated transmission signal client receiving time.

Abstract: A method and system are disclosed for providing an estimate of a location of a user receiver device. The method and system involve emitting from at least one vehicle at least one spot beam on Earth, and receiving with the user receiver device a signal from at least one spot beam. In one or more embodiments, at least one vehicle may be a satellite and/or a pseudolite. The method and system further involve calculating with the user receiver device the estimate of the location of the user receiver device according to the user receiver device's location within at least one spot beam. In some embodiments, when the user receiver device receives signals from at least two spot beams, the user receiver device calculates the estimate of the location of the user receiver device to be located in the center of the intersection of at least two spot beams.

Abstract: A vehicle control system with user-guided calibration is presented. In one embodiment, a vehicle control system is presented comprising an output device and circuitry operative to provide an output, via the output device, that guides a user through a plurality of calibration steps in a particular order. The circuitry can additionally or alternatively be operative to determine which of the calibration steps, if any, to present as a next calibration step based on whether a given calibration step is successful. Other embodiments are provided, and each of the embodiments can be used alone or in combination with one another.

Abstract: A system including a mobile vehicle, an implement, a position sensor, a controller, a user interface (a touch-screen monitor, video monitor or keypad, as examples), a software program to compute a calibration trajectory, and a steering system for steering the vehicle to the desired or adjusted trajectory based on the error between the vehicle's desired and actual positions. In one embodiment, non-co-located sensing and control combine with a calibration procedure to help eliminate model error. Another embodiment uses co-located sensing (but not control) to calibrate the model.

Abstract: A method for adjusting a desired trajectory of an automatically guided vehicle guidance system to match a physical constraint such as an obstacle or boundary. The method works around obstacles and boundaries as they occur, consistent with the original trajectory. The method is independent of the type of vehicle. The method may be used regardless of whether the vehicle is under automatic guidance, and the method has a low computational cost.