Communications: directive radio wave systems and devices (e.g. – With particular circuit – With polarization
Patent
1993-05-19
1995-05-30
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
With polarization
G01S 1300
Patent
active
054205905
ABSTRACT:
The total energy, wave type, orientation and rotation of an incident electromagnetic signal having an unknown polarization is identified through single channel frequency domain signal analysis of the incident electromagnetic wave power as measured by an orthogonally polarized electromagnetic sensor. A controlled switch samples between the power measurements at each orthogonal output of the sensor to generate a signal comprised of a carrier frequency component and two sideband frequency components in the frequency domain. The sampled radio frequency signal is down converted by a single channel receiver to an intermediate frequency where the carrier and one sideband frequency component are separated and coherently shifted to the same frequency. A phase detector and ratiometer measure the relative phase and amplitude differences between the separated carrier and sideband frequency components to identify the wave type, orientation and rotation of the incident electromagnetic signal. In addition to identifying the type, orientation and rotation of the incident electromagnetic wave, the total energy of the incident polarized electromagnetic wave is determined using a single channel polarization diversity system or a single channel polarization insensitive system.
REFERENCES:
patent: 3836973 (1974-09-01), Shnitkin et al.
patent: 3890571 (1975-06-01), Beyer
patent: 4313205 (1982-01-01), Rhodes
patent: 4556888 (1985-12-01), McNaul
patent: 5235340 (1993-08-01), Shea
E-Systems Inc.
Hellner Mark
Meier Harold E.
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