High Speed Charge-Coupled Device (CCD) Two-Dimensional Correlator.

摘要

A CCD-based two-dimensional correlator system is described which correlates a 256 x 256 image with a 32 x 32 reference in less than 1 second. The high computation rate (more than 100 million operations per second) is achieved using two high speed CCDs: a 32-stage programmable transversal filter (PTF) which correlates an analog signal with a set of 32 6-bit tap weights at a 5 MHz rate, and an accumulating memory which sums successive correlation records from the PTF. This system uses a technique which performs a series of one-dimensional correlations in the PTF and sums them in the accumulator to form the two-dimensional correlation. This approach is capable of considerable flexibility and can be extended to correlations of much larger image and reference sizes even with a transversal filter of limited length, and also to correlations of data of more than two dimensions.