Synthetic aperture radar target simulator

US4450447A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Howard A. Zebker · Palo Alto, US
• Daniel Held · Palo Alto, US
• Richard M. Goldstein · Sunnyvale, US
• Thomas C. Bickler · Tustin, US

Key dates

• Filing date: Jul 17, 1981
• Grant date: May 22, 1984
• Expiry date: Jul 17, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S7/4095
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A synthetic aperture radar (SAR) target simulator for simulating the radar return, or echo, from a target seen by a SAR antenna mounted on a platform moving with respect to the target includes a first-in first-out memory (26) which has digital information clocked in at a rate related to the frequency of a transmitted radar signal and digital information clocked out with a fixed delay defining range between the SAR and the simulated target, and at a rate related to the frequency of the return signal. An rf input signal having a frequency similar to that utilized by a synthetic aperture array radar is mixed with a local oscillator (16) signal to provide a first baseband signal having a frequency considerably lower than that of the rf input signal. The first baseband signal is converted to a plurality of digital words which are clocked into the memory (26) at a rate related to the frequency of the local oscillator (16). A synthesizer (34) is locked to the local oscillator (16) and provides an output signal having a nominal frequency equal to that of the local oscillator ( 16), but altered in accordance with range changes between the SAR and the simulated target, as well as in accordan…