Information extraction for Doppler radar
AssigneeWestinghouse Electric Corp.
InventorChristopher R. Vale
Life of this patent
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Abstract
A filter array is provided for extracting velocity information from the return pulse of a Doppler radar system. The array consists of a plurality of two-pole, bandpass crystal filter networks directly connected in parallel, the filter networks including crystal resonators and all but one of the networks having reactances in series with the resonators. The crystal resonators are identical in all of the networks and the reactances change progressively in successive networks in such a manner that adjacent filter networks respond to contiguous frequency bands.
Claims6
A crystal filter array comprising a plurality of individual two-pole bandpass filter networks directly connected together for connection in parallel to a single signal source, each of said filter networks including two crystal resonators connected in series and a capacitor connecting the junction between the resonators to ground, all of the crystals in all of the networks being identical, and reactance means connected in the circuit of at least some of said networks in a manner to modify the frequency response of the network, said reactance means being different in each network.
Dependencies are inferred from the claim text.