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Title: Radar system
Claims: I claim: 1. In a radar of the type possessing an electronically nutated antenna from the output of which azimuth and elevation difference signals are obtained and applied to a modulator for development of a suppressed-carrier wave which is amplitude-modulated at the nutation frequency and which has an amplitude and phase proportional to the amplitude and direction of antenna boresight error, and in which a lobing reference signal generator develops an elevation lobing reference signal and an azimuth lobing reference signal for application to said modulator and also for respective application to two phase-sensitive detectors in order to generate a pair of antenna error signals, the improvement which comprises apparatus for improving the target-tracking capabilities of said radar in a pulse-jamming environment, where said pulse jamming is at or near the antenna nutation frequency, said apparatus including means for periodically reversing the phase of the said two lobing reference signals so as to minimize the effect of any jamming energy which may be present in the return signal from the target, wherein said means for periodically reversing the phase of the said two lobing reference signals including means for developing a pair of rectangular commutating waves 90.degree. out of phase with one another, a pair of phase reversers, means for applying to the other of said phase reversers said azimuth lobing reference signal and the other of said commutating waves, means for applying the output of said one phase reverser both to said modulator and to one of said phase-sensitive detectors, and means for applying the output of the other of said phase reversers both to said modulator and to the remaining one of said phase-sensitive detectors. 2. A radar as set forth in claim 1, in which each of said phase reversers includes a pair of amplifiers keyed by one of said commutating waves so as to control the passage therethrough of one of said lobing reference signals. 3. The combination of claim 2, in which each of said phase reversers includes means for combining the signals constituting the respective outputs of said pair of amplifiers. Other info: Inventors: Felsenthal, Jr., Harry D. (Camarillo, CA, US) Application Number: 810037 Filing Date: 1969-03-24 Publication_date: 1976-03-30 Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC) Primary Class(es): 342/16 342/78 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Hubler, Malcolm F. Assistant Examiner: Attorney: Sciascia; Richard S., St.Amand; Joseph M., Murray, Jr.; Howard J. |
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