Monopulse processor
AssigneeMartin Marietta Corporation
InventorSamuel M. Sherman
Life of this patent
Estimating the term…
Abstract
In a monopulse radar processor, the usual sum (s) and difference (d) signals are manipulated to produce two other signals (s+ad and s+bd, in which a and b are constants). The phase of each of these derived signals with respect to the sum signal is then determined. The real part of d/s and, if desired, the imaginary part of d/s are calculated from these measured phase angles. The real part of d/s is the conventional output from a monopulse processor.
Claims11
In a monopulse receiver system which derives a sum signal and a first difference signal in a first coordinate on reception and which derives a target position signal from said sum and difference signals, said target position signal indicating the position of a target with respect to the receive beam axis in said first coordinate, the improvement comprising:
- means responsive to said first difference signal for providing second and third difference signals, at least one of said second and third difference signals having a different relative phase than said first difference signal and said second and third difference signals having differing relative phases;
- means for combining said sum signal and said second difference signal to provide a first combined signal;
- means for combining said sum signal and said third difference signal to provide a second combined signal;
- first phase detector means responsive to said first combined signal and said sum signal for providing a first phase angle signal representing a first relative phase angle .PHI..sub.1 between said sum signal and said first combined signal;
- second phase detector means responsive to said second combined signal and said sum signal for producing a second phase angle signal representing a second relative phase angle .PHI..sub.2 between said second combined signal and said sum signal;
- and
- processing means responsive to said first and second phase angle signals to produce a target position signal in said first coordinate.
A method of deriving target position information from the sum and a first difference signal in a monopulse receiver system, said method comprising:
- equally power dividing said first difference signal to produce intermediate difference signals;
- forming a second difference signal from one of said intermediate difference signals by phase shifting the intermediate difference signal relative to said first difference signal;
- forming a third difference signal from the other intermediate difference signal, said third difference signal having a different relative phase than said second difference signal;
- combining said sum signal and said second difference signal to form a first combined signal;
- combining said sum signal and said third difference signal to form a second combined signal;
- determining a first relative phase angle .PHI..sub.1 between said sum signal and said first combined signal;
- determining a second relative phase angle .PHI..sub.2 between said second combined signal and said sum signal;
- and
- deriving target position information from said first relative phase angle .PHI..sub.1 and said second relative phase angle .PHI..sub.2.
Dependencies are inferred from the claim text.