Skip to Content
Find More Like This
Return to Search

Digital intermediate frequency receiver module for use in airborne SAR applications

United States Patent

March 8, 2005
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A digital IF receiver (DRX) module directly compatible with advanced radar systems such as synthetic aperture radar (SAR) systems. The DRX can combine a 1 G-Sample/sec 8-bit ADC with high-speed digital signal processor, such as high gate-count FPGA technology or ASICs to realize a wideband IF receiver. DSP operations implemented in the DRX can include quadrature demodulation and multi-rate, variable-bandwidth IF filtering. Pulse-to-pulse (Doppler domain) filtering can also be implemented in the form of a presummer (accumulator) and an azimuth prefilter. An out of band noise source can be employed to provide a dither signal to the ADC, and later be removed by digital signal processing. Both the range and Doppler domain filtering operations can be implemented using a unique pane architecture which allows on-the-fly selection of the filter decimation factor, and hence, the filter bandwidth. The DRX module can include a standard VME-64 interface for control, status, and programming. An interface can provide phase history data to the real-time image formation processors. A third front-panel data port (FPDP) interface can send wide bandwidth, raw phase histories to a real-time phase history recorder for ground processing.
Tise; Bertice L. (Albuquerque, NM), Dubbert; Dale F. (Cedar Crest, NM)
Sandia Corporation (Albuquerque, NM)
10/ 686,379
October 15, 2003
GOVERNMENT INTEREST The present invention was developed under a contract with the United States Department of Energy under contract DE-AC04-94AL85000. Therefore, the U.S. Government has rights to use of the present invention.