Abstract: A sensor network having a first command center and a first access node, comprising a wireless transceiver, coupled to the command center. The sensor network may also include a plurality of nodes individually comprising a wireless transceiver and a directional antenna, wherein each of the plurality of nodes is successively located in a downlink direction relative to the first access node, and is configured to wirelessly communicate via the directional antenna with at least one node of a first neighbor group in a first direction and at least one node of a second neighbor group in a second direction. In addition, a sensor device is individually coupled to at least one of the nodes, and is configured to provide sensor data for the first command center.

Abstract: A sensor network having a first command center and a first access node, comprising a wireless transceiver, coupled to the command center. The sensor network may also include a plurality of nodes individually comprising a wireless transceiver and a directional antenna, wherein each of the plurality of nodes is successively located in a downlink direction relative to the first access node, and is configured to wirelessly communicate via the directional antenna with at least one node of a first neighbor group in a first direction and at least one node of a second neighbor group in a second direction. In addition, a sensor device is individually coupled to at least one of the nodes, and is configured to provide sensor data for the first command center.

Abstract: Methods and apparatus are provided for radar systems using multiple pulses that are shorter than the expected range delay extent of the target to be imaged. In one implementation, a method for performing radar includes the steps of: transmitting a plurality of pulses, each pulse having a different center frequency and a time duration shorter than an expected range delay extent of a target, wherein a total bandwidth is defined by a bandwidth occupied by the plurality of pulses; receiving reflections of the plurality of pulses; and performing pulse compression on the received pulse reflections to generate a detection signal having a radar resolution approximately equivalent to the transmission and reception of a single pulse having the total bandwidth. In preferred form, the pulses comprise ultrawideband (UWB) pulses each occupying a sub-band of the overall system bandwidth.

Abstract: Correcting a signal offset may include observing a finite duration signal yn that comprises a representation of a mixture of a desired signal that may include data of interest, and an undesired signal based on interference of an external interference source. The undesired signal may include an offset component which may be modeled as comprising a step function u defined by unknown step function parameters. The unknown step function parameters may be estimated using, for example, a maximum likelihood method. Thereafter, yn may be corrected based on the estimated step function parameters.

Abstract: Correcting a signal offset may include observing a finite duration signal yn that comprises a representation of a mixture of a desired signal and an undesired signal. The undesired signal may include an offset component which may be modeled as comprising a step function u defined by unknown step function parameters. The unknown step function parameters may be estimated using, for example, a maximum likelihood method. Thereafter, yn may be corrected based on the estimated step function parameters.