Optical Processors for Adaptive Phased Array Radars.
Abstract
Three new optical signal processing techniques and architectures were considered for advanced adaptive phased array radar signal processing. Use of a residue arithmetic optical processor was studied. A new correlation approach to residue arithmetic operations was developed together with new optical decimal/residue and residue/decimal converters, a residue arithmetic adder and matrix processor. Format control of the data in such systems and availability of the necessary components are of concern in this type of optical processor. A multi-channel optical frequency plane correlator in which the received signals at the N array elements are correlated with a reference element was studied. The output correlation plane pattern obtained is slit integrated in angles by a special detector to yield a map of the angular distribution of the noise field. From this output, an inverse DFT digital postprocessor was shown to yield the desired weights under restrictive cases. A time integrating acousto-optic correlator version of this system appears preferable, since it uses more available 1-D transducers and provides the high center frequency and large time bandwidth products necessary. An iterative optical processor was then considered. This system uses a linear LED input array, 2-D mask and 1-D photodetector array to perform a vector-matrix multiplication. With feedback, this system can solve the adaptive radar equation using a new iterative algorithm.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1980
- Accession Number
- ADA086964
Entities
People
- David P. Casasent
Organizations
- Carnegie Mellon University