A radar system processes signals in a flexible, adaptive manner to determine range, Doppler (velocity) and angle of objects in an environment. The radar system processes the received signal to achieve different objectives depending on one or more of a selected range resolution, a selected velocity resolution, and a selected angle of arrival resolution, as defined by memory requirements and processing requirements. The system allows improved resolution of range, Doppler and/or angle depending on the memory requirements and processing requirements.

An unauthorized communication prevention system includes a communication device that is arranged in an operation subject and configured to wirelessly communicate with a terminal. The system further includes a notification unit that transmits unique authentication information of the operation subject when the terminal and the communication device establish communication; a checking unit that checks, with the authentication information, whether the terminal and the operation subject are a proper pair; and an actuation unit that performs a process for determining a positional relationship of the terminal relative to the operation subject in accordance with a check result of the checking unit.

A location system includes transmission reception devices. A first transmission reception device is configured to operate as a stationary unit of the location system for localizing tag devices by exchanging ultra-wideband signals. The tag devices is localizable within a localizing space that extends along a high-resolution line associated with the first transmission reception device. The system also includes a movable unit and first and second tag devices that are positioned at the movable unit and are separated from each other by a tag separation distance. A control system is configured to perform an ultra-wideband signal analysis to determine the distance from a selected tag device to the first transmission reception device and to derive an orientation of the movable unit with respect to the high-resolution line from distances determined for the first tag device and the second tag device.

An interference removal filter that includes a combination of a first filter and a second filter, where the first filter passes signals over a frequency range of size B with a variation of less than +/3 dB, where the peak value of the impulse response of the second filter is displaced in time from the peak value of the impulse response of the first filter by at least 2/B time units, and where the combination of the first filter and the second filter produces a notch in frequency at a frequency location within the frequency range.

A radar system processes signals in a flexible, adaptive manner to determine range, Doppler (velocity) and angle of objects in an environment. The radar system processes the received signal to achieve different objectives depending on one or more of a selected range resolution, a selected velocity resolution, and a selected angle of arrival resolution, as defined by memory requirements and processing requirements. The system allows improved resolution of range, Doppler and/or angle depending on the memory requirements and processing requirements.

A method and system for controlling a ranging period of a multi-ranging session of ultra-wideband (UWB) communication, the method including defining a setup including multiple sessions in an ultra-wideband (UWB) communication, allotting and dividing a plurality of schedule blocks in a first session, the first session allotting and dividing including attempting a ranging by incorporating a first UWB signal into a first region for each schedule block and allotting and dividing one or more schedule blocks in an n-th session (n>1), wherein the n-th session allotting and dividing includes attempting a ranging by incorporating an n-th UWB signal.

The present invention is proposed to solve the above problems and is directed to providing a UWB system comprising: a memory in which a UWB ranging factor definition program is embedded; and a processor which executes the program, wherein the processor predefines UWB ranging factors to define an encryption key in consideration of a unique m-byte key characteristic for each set of a vehicle and a device.

According to an aspect of the present invention, there is provided a ultra-wideband (UWB) system comprising: a memory in which a UWB ranging factor definition program is embedded; and a processor which executes the program, wherein the processor predefines UWB ranging factors to define a scrambled timestamp sequence (STS) index in consideration of a characteristic of an n-byte random value that is changed every ranging.

Example signal transmission methods and apparatus are described. In one example method, a first initiating device sends a poll frame. The poll frame includes time-frequency location information of N first ultra-wideband (UWB) segment signals, and the poll frame further includes first delay information for each of M second responding devices to reply to the first initiating device with a response frame. The first initiating device receives a plurality of response frames based on a timestamp of the poll frame and the first delay information for each of the M second responding devices to reply to the first initiating device with the response frame.

Ultra-Wideband (UWB) technology exploits modulated coded impulses over a wide frequency spectrum with very low power over a short distance for digital data transmission. Such UWB systems through their receivers may operate in the presence of interfering signals and should provide for robust communications. Accordingly, an accurate and sharp filter that operates at low power is required and beneficially one that does not require a highly accurate power heavy clock. Further, many UWB applications require location and/or range finding of other elements and it would therefore be beneficial to provide a UWB based range finding and/or location capability removing the requirement to add additional device complexity and, typically significant, power consumption.