Pseudo-random code (PRC) surveilance radar

US4042925A · kind A · utility

Assignee

• International Telephone and Telegraph Corporation · US

Inventors

• Damian F. Albanese · Calabasas, US
• Frank J. O'Farrell · Valencia, US
• David E. Hammers · Los Angeles, US
• Henry R. Kennedy · Los Angeles, US

Key dates

• Filing date: Nov 24, 1975
• Grant date: Aug 16, 1977
• Expiry date: Nov 24, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/325
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A CW pseudo-random-coded (PRC) radar system including a triple-clock arrangement. The three slightly different clock frequencies are sequentially employed to generate the bi-phase coded RF transmissions and the received echo signals are separately bi-phase de-modulated by code bit. Clutter filtering and sampling in both I and Q channels by a commutating element are employed. Video processing, preferably of the FFT type, is provided as is range-ambiguity processing. The system provides resolution of range ambiguities over a long total range permitting the PRC word length and other system parameters to be optimized for elimination of Doppler ambiguities.