While a great deal of experimental evidence supports the Reichardt correlator as a mechanism for biological motion detection, the correlator does not signal true image velocity. This study examines the accuracy with which physiological Reichardt correlators can provide velocity estimates in an organism’s natural visual environment. Both simulations and analysis show that the predictable statist...

A seven-port wave-correlator based vector network analyzer is proposed. The seven-port wave-correlator is a combination of two six-port wave-correlators which share common components. Furthermore, the complex wave ratio measurement accuracy is improved since the input signals can be directly detected by the side-arm ports. A seven-port wave-correlator is fabricated using microstrip branch line ...

An adaptive joint transform correlator for real-time pattern recognition is presented. A reference image for the correlator is generated with a new iterative algorithm. The training algorithm is based on synthetic discriminant functions. The obtained reference image contains the information needed to reliably discriminate a target against known false objects and a cluttered background. Calibrat...

Proposed HI structure observatories for studying the epoch of reionization (z ≈ 6–15) and dark energy (z ≈ 0–6) envision compact arrays with tens of thousands of antenna elements. Fully correlating this many elements is computationally expensive using XF or FX correlators, and has led some groups to reconsider direct imaging/FFT correlators. In this paper we develop a variation of the direct im...

Although a great deal of experimental evidence supports the notion of a Reichardt correlator as a mechanism for biological motion detection, the correlator does not signal true image velocity. This study examines the accuracy with which realistic Reichardt correlators can provide velocity estimates in an organism's natural visual environment. The predictable statistics of natural images imply a...

Low-area matched filter and correlator designs are explored in this thesis, for ADC resolutions of 1and 2-bits. Correlators are used extensively in spread-spectrum communication technologies, where they serve as a means of detecting a known pseudo-random sequence (PN code). The correlator designs presented here are intended for direct-sequence spread spectrum (DSSS) radio, where the data to be ...

Sub Block Parameter Name Controls Possible Values Chosen Value in_w input bit width any integer 7 corr_w correlator/output bit width any integer 12 mac_arch1 correlator architecture {0,1,2,3} 1 in_w input bit width any integer 12 out_w output bit width any integer 6 sh_w shift right bit width any integer 3 in_w input bit width any integer 6 corr_w correlator/output bit width any integer 16 mut ...

Earthbound radio telescopes use for the processing of the received signals a central correlator system. However, for interferometry in space using free flying units, where downlink bandwidth, the power dissipation and space per satellite is limited, a distributed correlator can be more advantageous. This distribution reduces the risk of failures as well. In this paper the proposed architecture ...