Importance

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Abstract

The correlator responds to an input of N code sequences each having E code elements, each N sequence corresponding to a given state of a local coder. Each E element consists of one of W frequencies received for a time T. In the absence of an input an N-counter will advance under control of a timer. When the N-counter advances, an E-counter is reset. A local frequency synthesizer is set to one of W frequencies under control of the state of the coder, state of the E-counter and the state of the N-counter which will make the correlator receptive to the first element of the N-sequence corresponding to the value N at which the N-counter is sitting. If this frequency input is present for a time T, the E-counter will advance by one count and wait for the next element. The E-counter produces an output when advanced through E counts in a time interval to ET. This output advances the coder and delivers a correlator output corresponding to the state of the N-counter.

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First Claim