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Matched Filter Doppler Acquisition System

IP.com Disclosure Number: IPCOM000095642D
Original Publication Date: 1964-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Buck, RE: AUTHOR

Abstract

This is a system for acquiring doppler shifted signals. Signals received from a distant transmitter are passed through an IF section. They are then applied to a series of stacked band pass filters of which only one is in use at any one time. The thus filtered signal is fed, through a sampler and clipper to a matched filter. This generates an autocorrelation peak when, and only when, the pattern transmitted by the distant transmitter matches that of the matched filter.

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Matched Filter Doppler Acquisition System

This is a system for acquiring doppler shifted signals. Signals received from a distant transmitter are passed through an IF section. They are then applied to a series of stacked band pass filters of which only one is in use at any one time. The thus filtered signal is fed, through a sampler and clipper to a matched filter. This generates an autocorrelation peak when, and only when, the pattern transmitted by the distant transmitter matches that of the matched filter.

In turn, the output from the matched filter indicates not only that a pattern has been received, but also indicates in what portion of the frequency spectrum this pattern is located. This information is accepted by the logic circuitry, which then controls a voltage controlled oscillator to shift the received signals to a lower band width. At the same time, the logic circuitry also connects a different band pass filter of narrower band width.

A newly received pattern from the transmitter of a narrower band width then causes an identical sequence of events. These result in a repetitive readjustment by the receiving circuitry in response to the varying patterns automatically transmitted by the transmitter. Finally, the band width of the pattern transmitted by the distant transmitter is decreased whereupon the switches in the receiving side are connected to the narrowest band pass filter which indicates that the most acceptable band width position has been acqui...