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System for simplification of reconfigurable beam-forming network processing within a phased array antenna for a telecommunications satellite

一种相控阵天线、波束的技术，应用在单独通电的天线阵列、特定的阵列进料系统、适合于可移动物体上的天线等方向，能够解决不能支持等问题

Active Publication Date: 2010-08-11
ASTRIUM GMBH
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AI Technical Summary

Problems solved by technology

Even the next generation of on-board digital processors cannot support the complexity required to provide fully flexible beamforming for phased arrays designed to generate, for example, 20GHz coverage at a bandwidth of 500MHz across Europe, 100 beams with a diameter of 0.5, which is a current commercial requirement

Method used

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  • System for simplification of reconfigurable beam-forming network processing within a phased array antenna for a telecommunications satellite
  • System for simplification of reconfigurable beam-forming network processing within a phased array antenna for a telecommunications satellite
  • System for simplification of reconfigurable beam-forming network processing within a phased array antenna for a telecommunications satellite

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Embodiment Construction

[0045] Direct radiating phased arrays have an element spacing chosen such that they do not produce grating lobes within a certain defined field of view. For satellites operating in geosynchronous orbits, it is usually necessary (to mitigate interference) to keep the grating lobes away from the Earth. This, together with the general need for the antenna to be able to scan the beam anywhere on the visible earth means that the element spacing should not exceed 2-3 wavelengths. On the other hand, the overall size of the array is determined inversely proportional to the angular size of the beam the array is designed to generate. To provide a 0.5 degree spot beam, a total aperture of about 2.4m diameter may be required at the chosen frequency of 20GHz. At an element spacing of approximately 3.3 cm (2.2 wavelengths at 20 GHz), more than 4000 elements are required.

[0046] For the above reasons, it is not practical to provide a phased array antenna specifically designed and dimensi...

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Abstract

A telecommunications satellite having a phased array antenna, wherein the beam-forming function within the phased array is simplified by partitioning it into two stages, in which the sub-array stage relates to a fixed, or infrequently changed,set of overlapping sub-arrays and the main stage provides the main pattern reconfiguration, typically in the form of multiple reconfigurable spot beams within a defined coverage region. The key advantage lies in the significant reduction in number of second stage beam-forming control points (at which independent amplitude and phase is applied) when compared with a conventional phased array (where amplitude and phase control is applied for each element of the array). The sub-array stage beam-forming may be implemented in analogue technology. The main beam-former may be implemented in digital technology, where the key processing functions of A / D or D / A conversion, frequency (de)multiplexing and digital beam-forming all scale with the number of control points.

Description

technical field [0001] The present invention relates generally to beamforming of phased array antennas for communications spacecraft, and more particularly to simplification of reconfigurable beamforming network processing within phased array antennas for communications satellites. Background technique [0002] A clear trend in satellite communications is towards the use of multiple spot beam coverage in order to provide high gain (to reduce power and operate with small terminals) and to support spatial frequency reuse (to increase throughput within bandwidth-constrained systems). It is expressly known to define such narrow spot beams with multi-element antenna systems by means of digital beamforming techniques consisting in assigning complex signal weights to the elements for each communication frequency channel to control the spot beam parameters: see A.M.Bishop et al. "The INMARSAT 4Digital Processor and Next Generation Developments", 23rd AIAA ICSSC, Rome, Italy, Septemb...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/28H01Q3/26H01Q21/00H01Q21/06H01Q25/00H01Q21/22
CPCH01Q21/0006H01Q3/26H01Q25/00H01Q1/288H01Q21/22H01Q21/061H04B7/18515
Inventor 安东尼·邓肯·克雷格西蒙·约翰·斯特兰
Owner ASTRIUM GMBH
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