SHIPBOARD SENSOR EXERCISER APPARATUS

Abstract

A simulated burst echo signal (artificial target), corresponding to a deld and conditioned version of an RF burst signal from an associated radar under test, is presented to the associated radar under test by coupling a portion of the RF burst signal into a shipboard sensor exerciser apparatus in which the present invention is employed to feed an attenuated facsimile of the RF burst signal into a phase-locked loop portion thereof. The phase-locked loop locks on to the attenuated facsimile of the RF burst signal and generates an error signal in response thereto. The error signal is then digitized and stored in an error storage unit portion where it is delayed for a predetermined time associated with the desired selected range of the artificial target. After this appropriate delay time, a target processor portion of the shipboard sensor exerciser apparatus, in coaction with a system control logic, causes the error storage unit to dump through a digital-to-analog converter portion thereby reconstructing the error signal but delayed by the aforementioned predetermined time. The reconstructed error signal is used to drive a voltage controlled oscillator portion of the phase-locked loop in an open-loop mode of operation. The output from the voltage controlled oscillator, in this mode, is sent to an indicator of the associated radar under test via a programmable attenuated which is controlled by the target processor. The programmable attenuator makes it possible to change, inter alia, the power level and the cross section of the artificial target created.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1WILLIAM J. KOURY

Sensitive facility: Arlington VA (defense contractors)

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