초록 ▼

Certain man-made structures located in a complex background, such as railroad ties, telephone poles, and fences are detected by a flying craft, using a low powered structure resonant radar system. The radar system transmits a radar signal which includes wavelengths of the same order of magnitude as

Certain man-made structures located in a complex background, such as railroad ties, telephone poles, and fences are detected by a flying craft, using a low powered structure resonant radar system. The radar system transmits a radar signal which includes wavelengths of the same order of magnitude as twice the spacing of the elements of the man-made structure or grating multiples thereof, and transmits them in a plurality of different directions and frequencies. Reflections of the transmitted radar are received and structural resonance backscatter is detected wherein the backscatter amplitude at the resonant frequency is much higher than that at adjacent frequencies or that of the clutter background, indicating the presence of the search-for type of structure. The bright structural resonance backscatter can then be exploted by the structure resonant radar for guidance, homing, etc.

대표청구항 ▼

A method for locating a man-made structure located on land which has a multiplicity of substantially uniformly spaced elements, from a flying craft, comprising: transmitting radar signals in a plurality of different directions that are all at a downward incline from the craft toward the ground; rece

A method for locating a man-made structure located on land which has a multiplicity of substantially uniformly spaced elements, from a flying craft, comprising: transmitting radar signals in a plurality of different directions that are all at a downward incline from the craft toward the ground; receiving reflections of said radar signals and detecting a resonant frequency that is of at least twice the amplitude of the average frequencies of the received signals; and detecting the direction from which the received signals that included the resonant frequency, was received.