Signal processor for doppler type navigation system

Details Signal processor for doppler type navigation system Signal processor for doppler type navigation system

1975-02-27

1976-03-23

Safourek, Benedict V.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343113R, H04B 134

Patent

active

039463206

ABSTRACT:
A signal processing arrangement, particularly for Doppler ILS, giving complete scanning verification and tracking filter operation. Two commutated filters are driven by two voltage controlled oscillators whose roles are interchangeable. One filter is used solely for information signal tracking and the other solely for scanning. If the true signal is being tracked, the peak output from the scanning filter corresponds in amplitude and frequency to this signal and occurs at the same time as the frequency coincidence of the two oscillators. If the incorrect signal is being tracked, there is non-correspondance between the peak output and the signal being tracked. This is detected and the roles of the oscillators are interchanged, causing the oscillator which was scanning to reside on the correct signal and the other oscillator to adopt the scan program.

REFERENCES:
patent: 2954465 (1960-09-01), White
patent: 3537008 (1970-10-01), Lakatos
patent: 3623089 (1971-11-01), Bossert

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