Abstract: An obstacle sensor operating by collimation and focusing of the emitted wave comprises: a device (I) for insulating the electromagnetic waves emitted by a generator (1); a device for the automatic control (12, 12?) of the transmitter and of the sensor status; a device (15?÷15??) for amplifying the power of the signals emitted and/or received; different shapes of output lens (14?÷14??) of the antenna, with or without peripheral lobes (16), associated or non associated to microwave sensors (19). The sensor is associable to passive and/or active obstacle warning reflectors with the possibility of discriminating them not only if front but also side and above and below the horizon central azimuth, for road, aircraft and naval applications.

Abstract: There is provided a radar system for protecting a radar compartment from a transmitted radar beam. The radar system comprises an antenna having a transmitter surface for transmitting the radar beam. There is further provided a protective member having an outer protective surface. This protective member is externally located adjacent the antenna for protecting the radar compartment from the transmitted radar beam. In addition, an alignment member is disposed between the antenna and the protective member. The alignment member is sized and configured to align the transmitter surface towards the outer protective surface for guiding the transmission of the radar beam therethrough. By featuring these components in such an arrangement, an operating frequency of any portion of the transmitted radar beam which diffracts from the outer protective surface can be mitigated to protect the radar compartment therefrom.

Abstract: A method and apparatus determines the location of a signal transmitter located at an unknown location by using externally-induced intermodulation distortion emitted from the signal transmitter. A transmitter locator emits an interrogation signal having a frequency that is offset from the frequency of the signal emanating from the signal transmitter. The interrogation signal and the carrier signal of the signal transmitter are "mixed" within the signal transmitter to form an intermodulation product signal. The intermodulation product signal having a different frequency is then radiated from the unknown signal transmitter. A receiver tuned to the frequency of the intermodulation signal detects the returned signal and a processor determines the range and direction from the transmitter locator to the location of the signal transmitter.