Pre-Grant Publication Number: 20110103254
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Prior Art Detail
Summary / Description
| Summary / Description | An article describing the process of generating multiple beams on a sky in astronomical radio telescopes using a technique based on Fast Fourier Transform (FFT). |
Basic Information
| Type of Prior Art | Online Publication |
| URL | http://articles.adsabs.harvard.... |
| Author/Creator | G. A. HAMPSON, R. DE WILD AND A. B. SMOLDERS |
| Title | Efficient Multi-Beaming for the Next Generation of Radio Telescopes |
| Publication Date | April 1, 1999 |
| Publisher | Netherlands Foundation for Research into Astronomy |
| Directions to Document Location | |
| Additional Information | |
Notes / To Do
| Notes | |
Excerpt
Excerpt The next generation of astronomical radio telescopes will have the possibility of generating multiple beams on sky, unlike existing single beam systems. This can occur as the problem of obtaining sufficient sensitivity has been simplified by distributing the collecting area over a hierarchy of collecting elements.
Technology, in the form of computing power, can take advantage of this hierarchy to form efficient multiple simultaneous beams on the sky. The theoretical foundation of the multi-beam beamformer is introduced in this paper and simulation results presented. The technique is based on the Fast Fourier Transform (FFT) which results in an efficient implementation.
The twiddle factors of the FFT reduce to simple 90Æ rotations in the case of a four point FFT. The resulting design for THEA is shown to produce nine simultaneous beams and can be implemented on a relatively small FPGA. Additional phase control is required to steer the beams across the sky and implemented using complex multipliers. It will be shown that for particular array sizes the implementation results in nine beams for the cost of one. |
Relevance
Claims
7
Relevance
This article describes a method of beam-forming using FFT.
This article describes a method of beam-forming using FFT.
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