Propagation Research Associates, Inc. Patent applications |
Patent application number | Title | Published |
20140253368 | MULTI-MODE, MULTI-STATIC INTERFEROMETER UTILIZING PSEUDO ORTHOGONAL CODES - A system for providing a multi-mode, multi-static interferometer may include a transmitter array, a receiver array and a processor. The transmitter array includes at least a first transmitter and a second transmitter spatially separated from each other by a first known distance. The receiver array includes at least a first receiver and a second receiver spatially separated from each other by a second known distance. The receiver array is positioned to enable receipt of a return signal from transmissions provided by the transmitter array and reflecting off an object. The processor is configured to enable the transmitter array to generate uniquely coded signals and configured to distinguish, based on the uniquely coded signals, a first signal transmitted by the first transmitter from a second signal transmitted by the second transmitter in response to reception of a combined signal including reflected signals corresponding to at least the first and second signals by the receiver array. | 09-11-2014 |
20140198885 | METHODS AND SYSTEMS FOR MITIGATING SIGNAL INTERFERENCE - A received signal that includes a target signal and an interference signal is sampled in space and time and then filtered into a matched-filtered signal and into a mis-matched-filtered signal, which is orthogonal to, or nearly orthogonal to, the matched-filtered signal. The interference signal is present in both the matched-filtered signal and the mis-matched-filtered signal, whereas the target signal is present in only the matched-filtered signal. In the mis-matched-filtered signal, the interference signal is different from the matched-filtered signal in the temporal property, but is the same as the matched-filtered signal in the spatial property. After the matched-filtered signals and the mis-match-filtered signals have been obtained for the signals received by each antenna element of an array of antenna elements, they are processed to obtain a result vector, W, that is a representation of the target signal without the interference. | 07-17-2014 |
20140128002 | METHOD AND SYSTEM FOR USING ORTHOGONAL SPACE PROJECTIONS TO MITIGATE INTERFERENCE - Systems and methods are provided for mitigating natural and man-made interference through the use of one or more orthogonal, or nearly-orthogonal, projections of the received signal, which is assumed to be contaminated with interference, into one or more orthogonal projection spaces based on properties of the signal of interest. Once separated into orthogonal projection space(s), the system and method use information contained in the orthogonal projection space(s) to separate the signal of interest, or target signal, from the interference and to mitigate the interference. | 05-08-2014 |