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The use of radial basis function (RBF) networks and least squares algorithms for acquisition and fine tracking of NASA's 70-m-deep space network antennas is described and evaluated. We demonstrate that such a network, trained using the computationally efficient orthogonal least squares algorithm and working in conjunction with an array feed compensation… (More)

- V. Vilnrotter, C.-W. Lau, M. Srinivasan, R. Mukai, K. Andrews
- 2003

1 The theoretical foundations of an optical array receiver consisting of relatively small telescopes are developed and analyzed. It is shown that optical array receivers can be designed to perform as well as a large single-aperture receiver on the ground, while enjoying significant advantages in terms of operational reliability , ease of future expansion to… (More)

This paper presents a prototype system for blind source separation (BSS) of many speech signals and describes the techniques used in the system. Our system uses 8 microphones located at the vertexes of a 4 cm times 4 cm times 4 cm cube and has the ability to separate signals distributed in three-dimensional space. The mixed signals observed by the… (More)

The use of radial basis function networks for fine pointing NASA's 70-meter deep space network antennas is described and evaluated. We demonstrate that such a network, working in conjunction with the array feed compensation system, and trained using the computationally efficient orthogonal least-squares algorithm, can point a 70-meter deep space antenna… (More)

This article describes computationally intelligent neural-network and least-squares tracking algorithms for fine pointing NASA's 70-m Deep Space Network (DSN) antennas using the seven-channel Ka-band (32-GHz) array feed compensation system (AFCS). These algorithms process normalized inputs from the seven horns of the array in parallel and, hence, are less… (More)

- R. Mukai, V. A. Vilnrotter, C.-W. Lau
- 2006

1 Earth's atmospheric turbulence induces aberrations in the wavefront of the optical signal from a distant spacecraft. These aberrations cause diffusion and spreading of the signal energy in the receiver's focal plane, potentially resulting in an increase in bit-error rate (BER) by several orders of magnitude when significant background radiation is… (More)

— A method for optimal adaptive setting of pulse-position-modulation pulse detection thresholds, which minimizes the total probability of error for the dynamically fading optical free space channel, is presented. The threshold's adaptive setting, in response to varying channel conditions, results in orders of magnitude improvement in probability of error,… (More)

1 This article describes computationally intelligent neural-network and least-squares algorithms for precise pointing of NASA's 70-meter Deep Space Network (DSN) antennas using the seven-channel Ka-band (32-GHz) array feed compensation system (AFCS). These algorithms process normalized data from the seven horns of the array in parallel and thus are more… (More)

The use of radial basis function networks and least squares algorithms for acquisition, and fine tracking of NASA's 70-meter deep space network antennas is described and evaluated. We demonstrate that such an RBF network, working in conjunction with an array feed compensation system, and trained using the computationally efficient orthogonal least-squares… (More)

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