Communications: directive radio wave systems and devices (e.g. – Determining direction – Scanning
Patent
1991-05-09
1992-08-25
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Determining direction
Scanning
342 25, 342 74, 342 79, 342 81, G01S 1344
Patent
active
051422891
ABSTRACT:
A method of improving the amplitude-frequency characteristic when receiving a target echo (M) in a radar system installed on a satellite or an aircraft and carried at a given height (h) above the earth's surface. The method utilizes the known method of compressing a received pulse which contains a number of frequencies (f.sub.1 -f.sub.2) in order to obtain improved dissolution of the target. According to the method, the receiving lobe of the radar is swept, independently of frequency, over a given larger angular area (.theta..sub.b l-.theta..sub.a) within which the target (M) is located. Within the smaller angular area (.DELTA..theta.) occupied by the target as seen from the radar, i.e. the momentary width (.DELTA.w) of the target echo, however, the receiving lobe is controlled in dependence on the frequencies (f.sub.1 -f.sub.2) so as to obtain a number of optimally located receiving lobes for the smaller angular area (.DELTA..theta.).
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Sotomayor John B.
Telefonakitebolaget L M Ericsson
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