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Design

Design
The preliminary design is for 32* stations configured in a quasi-regular array with 15 m E-W and 45 m N-S spacing on the ground each station would consist of a uniform array of 5 × 5 cross-dipoles as illustrated in figure 1.



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Figure 1 Array Station Electronically steerable array of crossed dipoles for each station of the proposed array


The array is currenly planned to be located on MIT property in Westford close to the Haystack Observatory. Interference studies are underway to see if this site is acceptable.

Summary of array Characteristics
Configuration quasi-regular array of stations
»15 m E-W spacing on ground
» 45m N-S spacing on ground
Each station 5 × 5 compact array of crossed dipoles
collecting area 12 m2
beamwidth 12 degrees
electronic steering 20 degrees
mechanical reconfiguration of station elevation
number of available primary beams 25
synthesis resolution 30 minute of arc
frequency coverage 322.0-328.6 MHz
polarization dual linear - full stokes
system temperature limited by sky background 70-400 K
total collecting area 288 m2
total number receiver ports 1152
number of stations 24


Digital receiver block diagram




Figure 2 Block diagram of digital receiver for each station of the array



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