Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-09-24
1985-12-31
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 172PC, G01S 728, G01S 1328
Patent
active
045624380
ABSTRACT:
A radar transmitter transmits a group of pulses as shown at I of FIG. 2, the group consisting of first short pulse of a frequency f.sub.1 transmitted during time interval t.sub.1 to t.sub.2. A second, longer pulse of frequency f.sub.2 is transmitted during time interval t.sub.2 and t.sub.3 and a third, short pulse of frequency f.sub.1 is transmitted during time interval t.sub.3 to t.sub.4. The return from a close range small target is shown at II and the return from a large source of clutter or another large target at a slightly greater range is shown at III. The return from the larger target or source of clutter is so strong as to saturate the receiver during the time interval t.sub.7 to t.sub.12 and thus the return from the second short pulse during period t.sub.9 to t.sub.10 is obscured as shown at IV. However, since a short pulse is also transmitted before the long pulse its return, at time interval t.sub.5 to t.sub.6, is not obscured. In other situations where a large source of clutter or a large target is at a slightly closer range than the small target of interest the return during interval t.sub.5 to t.sub.6 will be obscured but the return of the second pulse during time interval t.sub.9 to t.sub.10 will not be obscured. In this way it is ensured that at least one of the two short pulses is detected.
REFERENCES:
patent: 3945011 (1976-03-01), Glasgow
patent: 4096478 (1978-06-01), Chavez
patent: 4136341 (1979-01-01), Mulder et al.
Rouse David G.
Wilkinson Christopher F.
Barron Jr. Gilberto
The Marconi Company Limited
Tubbesing T. H.
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