NDLI: Weak-signal phase calibration strategies for large DSN arrays

Content Provider	IEEE Xplore Digital Library
Author	Jones, D.L.
Copyright Year	2005
Description	Author affiliation: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA (Jones, D.L.)
Abstract	The NASA Deep Space Network (DSN) is studying arrays of large numbers of small, mass-produced radio antennas as a cost-effective way to increase downlink sensitivity and data rates for future missions. An important issue for the operation of large arrays is the accuracy with which signals from hundreds of small antennas can be combined. This is particularly true at Ka band (32 GHz) where atmospheric phase variations can be large and rapidly changing. A number of algorithms exist to correct the phases of signals from individual antennas in the case where a spacecraft signal provides a useful signal-to-noise ratio (SNR) on time scales shorter than the atmospheric coherence time. However, for very weak spacecraft signals it will be necessary to rely on background natural radio sources to maintain array phasing. Very weak signals could result from a spacecraft emergency or by design, such as direct-to-Earth data transmissions from distant planetary atmospheric or surface probes using only low gain antennas. This paper considers the parameter space where external real-time phase calibration will be necessary, and what this requires in terms of array configuration and signal processing. The inherent limitations of this technique are also discussed
Starting Page	1150
Ending Page	1157
File Size	375598
Page Count	8
File Format	PDF
ISBN	0780388704
DOI	10.1109/AERO.2005.1559406
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-03-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phased arrays Calibration Space vehicles Antenna arrays NASA Space missions Downlink Signal processing algorithms Signal to noise ratio Signal design
Content Type	Text
Resource Type	Article

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