Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-05-11
1984-04-10
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 1378
Patent
active
044424302
ABSTRACT:
The ITAT technique, embodied in ITAT hardware, provides a means to add additional operating modes to interrogator-transponder (beacon) systems in a relatively simple and economical manner. The technique permits the adding of special modulation to the normal pulse-coded transmissions for the purpose of providing a security identification code, or a digital wavefore enabling high processing gain, or both.
Two similarly designed ITAT units are required; one for interrogator systems, and one for transponder systems. Both units simply connect between the respective system units and the system antennas.
The ITAT units operate in two modes; "Normal" and "ITAT." In the normal mode, the units do not interfere with operation of the transponder-interrogator (beacon) system. In the ITAT mode, the units suppress the beacon system operating range by introducing attenuation between the interrogator unit (or transponder unit) and the antenna. In effect, normal operation is blocked during ITAT operation. In place of normal operation, the ITAT unit specially-modulates interrogator pulse-coded emissions to add special ITAT modulation. The ITAT receiver collocated with transponders detects and decodes ITAT interrogations and passes the pulse-code information to the transponder. When the transponder replies, ITAT modulation is added to the transmission. The ITAT receiver at the interrogator unit receives ITAT-modulated replies, decodes the information, and passes the reply code signals to the interrogator unit.
REFERENCES:
patent: 3418581 (1968-12-01), Kennedy et al.
patent: 3699570 (1972-10-01), Hanson et al.
patent: 3997898 (1976-12-01), Le Grand
patent: 4010465 (1977-03-01), Dodington et al.
patent: 4145690 (1979-03-01), Petitjean et al.
patent: 4161729 (1979-07-01), Schneider
Franz Bernard E.
Singer Donald J.
Tubbesing T. H.
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