Title: Signal processor for doppler type navigation system

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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Overbury, Francis G. (Cuffley, EN)
Barton, Paul (Bishops Stortford, EN)
Kelly, Kevin M. (Sawbridgeworth, EN)

Application Number: 553480
Filing Date: 1975-02-27
Publication_date: 1976-03-23
Assignee: International Standard Electric Corporation (New York, NY)
Primary Class(es): 455/161.3 342/400, 455/166.1
Other Classes:
US Patent Ref:

2954465	Sep, 1960	White	325/334.
3537008	Oct, 1970	Lakatos	325/474.
3623089	Nov, 1971	Bossert	343/5.

Other Refs:
Primary Examiner: Safourek, Benedict V.
Assistant Examiner:
Attorney: O'Neil; William T.