Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1989-04-28
1990-10-23
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
G01S 1390
Patent
active
049655825
ABSTRACT:
The invention relates to a method for radar mapping an area and a radar equipment for wideband exploration at frequencies below 300 MHz. A large number of frequencies, for instance 1000, are distributed over a frequency band between for instance 12.5 and 200 MHz, and approximately corresponding to terms in a geometrical series but being different harmonics to a certain fundamental frequency. This is accomplished by a synthesis generator coupled to a phase control device and the generated frequencies are each amplified in a separate amplifier, the outputs of which are guided in groups to a number of antennas, tuned to different frequency bands and fewer than the number of frequencies. The reception is carried out in a similar way from the antennas with pre-amplifiers and a mixer each and an A/D-converter and a registration device. The equipment is meant to use the principle of so called synthetic aperture radar (SAR).
REFERENCES:
patent: 4675677 (1987-06-01), von Maydell et al.
patent: 4768156 (1988-08-01), Whitehouse et al.
patent: 4794395 (1988-12-01), Cindrich et al.
Mensa et al., "Coherent Doppler Tomography for Microwave Imaging", Proceedings of the IEEE, vol. 71, Feb. 1983.
Hellner Mark
Tarcza Thomas H.
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