Polarization isolation and zero time-sidelobe pulse compression

Details Polarization isolation and zero time-sidelobe pulse compression Polarization isolation and zero time-sidelobe pulse compression

1987-08-20

1988-06-07

Buczinski, Stephen C.

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For frequency modulation

332 23R, G01S 728

Patent

active

H00004847

ABSTRACT:
This concept makes use of the orthogonal nature of Group-Complementary Co to achieve improved polarization isolation between the vertical and horizontal radiation in a circularly polarized or dual linearly polarized antenna system while achieving zero time-sidelobe responses in pulse compression. Two channels of a radar system are established with each being encoded using an orthogonal Group-Complementary Code. One channel is associated with the vertical polarization of radiation while the second is devoted to the horizontal polarization. With a leading or lagging 90 degree phase relationship between the two channels, right hand or left hand circular polarization can be established according to the code of each channel which controls the relative phase. Such a technique of pulse compression and group complementary coding offers improved polarization isolation between channels while achieving zero-time sidelobes in pulse compression. The same isolation would be realized for a two channel system radiating simultaneous linear but orthogonal polarization.

REFERENCES:
patent: 2551348 (1951-05-01), Sunstein
patent: 3517338 (1970-06-01), Herman et al.
patent: 3686588 (1972-08-01), Jackson et al.
patent: 4276521 (1981-06-01), Davidheiser
patent: 4329687 (1982-05-01), Kloevekorn
patent: 4353067 (1982-10-01), Mims
patent: 4472717 (1984-09-01), Eaves et al.
patent: 4513288 (1985-04-01), Weathers et al.
patent: 4580139 (1986-04-01), Weathers et al.

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