Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1982-08-16
1985-09-03
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5NQ, 343 177, G01S 1332, G01S 740
Patent
active
045395659
ABSTRACT:
An FM/CW radar linearization network provides target identification data discriminating a target from background reflections and/or false targets by compensating for random variations in the linearity of the frequency sweep of the radar transmitter in the processing of the radar receiver signal, the latter being characteristic of the range and physical size of the target. Linearization is achieved by sampling the transmitter signal, generating an error signal proportional to and indicative of any deviations in the frequency sweep of the transmitter from that for linear operation, and applying that error signal to correct the target data signal, thereby frequency normalizing the same for processing and utilization. A number of alternatives in respect of the development of an appropriate error signal and further alternatives in its use as the basis for data correction are disclosed, including sampling of the transmitter in respect of the phase angle over a predetermined period or the time for a predetermined number of cycles, in order to develop an error signal proportional to and indicative of any deviations in the frequency sweep of the transmitter from that were its operation linear; while data correction may be made in one of a number of alternative ways, including phase rotation of the raw target data input signal, time-shifting of the sampling rate of such data, or frequency mixing the raw target data with an error control signal. Representative networks and suitable methodologies to achieve linearization are disclosed herein.
REFERENCES:
patent: 3340529 (1967-09-01), Blitz
patent: 3341849 (1967-09-01), Cordry et al.
patent: 4008475 (1977-02-01), Johnson
patent: 4106020 (1978-08-01), Johnson
patent: 4245221 (1981-01-01), Kipp et al.
The Boeing Company
Tubbesing T. H.
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