Abstract: A broadband blade monopole antenna is disclosed. The broadband blade monopole antenna includes a body portion that is substantially flat to define a two-dimensional plane that the body portion extends along. The body portion defines an outer perimeter having four sides. The four sides are grouped into two pairs of equal-length sides positioned directly adjacent to each other. The broadband blade monopole antenna provides at least about 100% impedance bandwidth.

Abstract: A broadband blade monopole antenna is disclosed. The broadband blade monopole antenna includes a body portion that is substantially flat to define a two-dimensional plane that the body portion extends along. The body portion defines an outer perimeter having four sides. The four sides are grouped into two pairs of equal-length sides positioned directly adjacent to each other. The broadband blade monopole antenna provides at least about 100% impedance bandwidth.

Abstract: A method to determine a location of a communications device may include measuring a time of arrival for each pulse received at a receiver. The method may also include generating a set of possible hypothetical matches between each received pulse and a transmission path between a transmitter and the receiver, wherein the communications device being located is one of the transmitter and the receiver. The method may further include estimating the location of the communications device using the set of hypothetical matches.

Abstract: A method for radio navigation may include predicting a frequency response for each of a multiplicity of possible device locations. The method may also include measuring a frequency response at an actual device location. The method may further include matching the measured frequency response to one of the predicted frequency responses to determine an estimated device location, wherein the estimated device location corresponds to the possible device location associated with the one predicted frequency response that most closely matches the measured frequency response.

Abstract: A method for trilateration may include receiving a signal via each of a plurality of LOS paths and predicting performance of each LOS path. The method may also include filtering out signals received via LOS paths with performance below a predetermined threshold value. The method may further include performing trilateration using unfiltered signals to substantially determine a location of a device.

Abstract: A method to determine a location of a communications device may include measuring a time of arrival for each pulse received at a receiver. The method may also include generating a set of possible hypothetical matches between each received pulse and a transmission path between a transmitter and the receiver, wherein the communications device being located is one of the transmitter and the receiver. The method may further include estimating the location of the communications device using the set of hypothetical matches.

Abstract: A method for radio navigation may include predicting a frequency response for each of a multiplicity of possible device locations. The method may also include measuring a frequency response at an actual device location. The method may further include matching the measured frequency response to one of the predicted frequency responses to determine an estimated device location, wherein the estimated device location corresponds to the possible device location associated with the one predicted frequency response that most closely matches the measured frequency response.

Abstract: A method for trilateration may include receiving a signal via each of a plurality of LOS paths and predicting performance of each LOS path. The method may also include filtering out signals received via LOS paths with performance below a predetermined threshold value. The method may further include performing trilateration using unfiltered signals to substantially determine a location of a device.

Abstract: A method and apparatus for radio navigation and location is disclosed. The method uses an autonomous, on-board micro-inertial navigation system to propagate the state of a station, and an angularly resolvable antenna to measure relative orientation and relative range and to receive estimated state information from one or more companion stations. Optimally estimated state information is used to permit operation in environments that are otherwise hostile to communications between stations.