Matched filters up power, reduce noise in radar

The applications and benefits offered by the use of solid-state CCDs and surface acoustic waves for providing matched filters for radar and communications purposes are outlined. In coherent military radar systems, proper phase relationships are created by oscillators between received and transmitted signals, and a double-phase discriminator extracts target distance and velocity information from the Doppler shift and attenuation of the signal. Attention is given to pulse compression and the attainment of satisfactory power levels with solid-state technology in chirp radar. Barker's codes as an alternative to chirp radar are examined, along with comparisons of the performance of matched-filter and conventional receivers. Examples of operations with navigation satellites are cited and investigated analytically. Finally, the benefits of employing charge transfer devices in video transmissions are indicated.