Communications: directive radio wave systems and devices (e.g. – With particular circuit – Spectrum analysis
Patent
1992-06-26
1993-07-13
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Spectrum analysis
342196, 342 90, G01S 1389, G01S 7292
Patent
active
052278018
ABSTRACT:
A coherent radar is used for achieving high resolution radar imaging of a moving object in sea clutter and noise. A stored replica of the transmitted waveform is combined with the returned signal in a synchronous detector to produce in-phase and quadrature (I and Q or complex) samples. High resolution is achieved by transmitting a series of pulses, each at a different frequency, and then processing these complex samples to produce a synthetic down-range profile. To enhance the radar target or object from system noise and sea clutter, the complex I and Q (in-phase and quadrature component) samples from the radar are coherently averaged in a special two-dimensional slice of the trispectrum (e.g. quadruple product or fourth-order moment). This formulation of the fourth moment retains all important target information and suppresses Gaussian noise. Once averaged, a new set of I and Q samples are reconstructed that produce the same trispectral slice as this average. These reconstructed samples are then transformed using conventional Fourier transform methods to produce the average, or enhanced, down-range profile.
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Miller Charles D.
Sotomayor John B.
The United States of America as represented by the Secretary of
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