Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-07-17
1984-05-22
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
434 2, G01S 740
Patent
active
044504470
ABSTRACT:
A synthetic aperture radar (SAR) target simulator for simulating the radar return, or echo, from a target seen by a SAR antenna mounted on a platform moving with respect to the target includes a first-in first-out memory (26) which has digital information clocked in at a rate related to the frequency of a transmitted radar signal and digital information clocked out with a fixed delay defining range between the SAR and the simulated target, and at a rate related to the frequency of the return signal. An rf input signal having a frequency similar to that utilized by a synthetic aperture array radar is mixed with a local oscillator (16) signal to provide a first baseband signal having a frequency considerably lower than that of the rf input signal. The first baseband signal is converted to a plurality of digital words which are clocked into the memory (26) at a rate related to the frequency of the local oscillator (16). A synthesizer (34) is locked to the local oscillator (16) and provides an output signal having a nominal frequency equal to that of the local oscillator ( 16), but altered in accordance with range changes between the SAR and the simulated target, as well as in accordance with Doppler information associated with return signals from the target.
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Bickler Thomas C.
Goldstein Richard M.
Held Daniel N.
Zebker Howard A.
Jones Thomas H.
Manning John R.
McCaul Paul F.
Steinberger Brian
The United States of America as represented by the Administrator
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