Raytheon Company

Roy E Byington

William M Pease

Nathan Freedman

David Garvin Armstrong

Fritz A Gross

Neil F Lacey

William J Wilson

A radar performance monitor (RPM) receives a transmitted radar signal from a radar system being monitored and couples the signal to a recirculating loop comprising a SAW delay line in order to produce a series of simulated radar return signals of equal amplitude and by using the same frequency as the received radar signal providing the frequency falls within a predetermined bandwidth of the SAW delay line. The simulated radar return signals are displayed at the radar system and used to evaluate the operation and calibration of a transmitter and the sensitivity and calibration of a transmitter and the sensitivity and calibration of a receiver in the radar system. The radar performance monitor is actuated at the option of a radar operator.

Recirculating delay line radar performance monitor

A digital memory system is described wherein a plurality of digital storage sections are simultaneously fed by an analog signal. Each storage section is adapted to store a sample of such analog signal in response to a pulse. Trains of pulses are fed to the storage sections, the pulses in each train being displaced in time from a succeeding train an amount T/n where n is the number of storage sections and T is related to the bandwidth of the analog signal.

Digital memory system

A system for digitally storing samples of an analog signal taken at a sampling rate, f, and for reconstructing said analog signal from such stored samples. The analog signal is separated into a plurality of, n, channels, each one of such channels having a digital storage section. Each one of the storage sections is adapted to store a sample of the analog signal in response to a sampling pulse. A pulse generator circuit is provided and supplies one of a plurality of trains of periodic sampling pulses to a corresponding one of the plurality of storage sections. The sampling pulses in each of the trains of sampling pulses have a pulse repetition frequency, f/n. Further, the sampling pulses in successive trains thereof are delayed in time 1/nth the period of the sampling pulses. Apparatus is provided for retrieving the samples stored in the plurality of storage sections in the same sequence as such samples were stored. The sequentially retrieved samples are obtained at the rate, f, and are combined into a composite signal, such composite signal being a reconstruction of the analog signal. By using plural channels, each one of the storage sections samples the analog signal at a rate less than that required for a single channel system.

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Sudbury, MA, United States of America

Roy E Byington