Communications: directive radio wave systems and devices (e.g. – With particular circuit – Display
Patent
1984-09-17
1988-04-19
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Display
G01S 1389
Patent
active
047393327
ABSTRACT:
A fanbeam inversion radar system (100) includes a frequency synthesizer (102) or other transmission means, a fanbeam antenna (104), an orientation sensor/controller (106) and a computer (110). The antenna is adapted for frequency scanning so that fanbeam position data is determined by the computer which controls the variable frequency synthesizer. By scanning a scene with fanbeams for each of a series of fanbeam orientations spanning 180.degree., a two-dimensional image reconstruction can be performed by algorithms well known in image processing fields.
By presorting radar returns by delay time (at 112), multiple reconstructed images can be obtained corresponding to different ranges. By mixing (at 122) the synthesizer output with a reference from a local oscillator (120) and "beating" the return against the same reference by means of synchronous demodulators (132), Doppler sorting can provide multiple images with respective relative velocities.
The radar system (100) uses serial frequency scanning. Also disclosed are parallel frequency scanning and mechanical scanning. An antenna for use in the frequency scanning systems is also provided.
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K. Milne, "The Combination of Pulse Compression with Frequency Scanning for Three-Dimensional Radars"; The Radio and Electronic Engineer; (vol. 28, No. 2; 8/64; pp. 89-106).
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Blum Theodore M.
Gregory Bernarr Earl
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
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