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31 July 1998 System design for the Millimeter Array
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Abstract
The Millimeter Array (MMA) will consist of 40 or more antennas operating as a correlator array in the frequency range 30 to 950 GHz. This paper is concerned with the transmission and processing of the signals received at the antennas from the outputs of the low-noise receiver front ends to the inputs of the correlator. It includes the IF and LO systems and the optical fiber transmission system that interconnects the antennas and the Electronics Building. There the signals are filtered for bandwidth selection, digitized, delayed as necessary to compensate for the varying path lengths to the antennas, and cross-correlated. A number of decisions must be made before detailed design can be started. These include the maximum bandwidth of the signals to be processed, the use of analog or digital transmission from the antennas, and the bandwidths required for spectral line observations. Detailed considerations include control of signal levels at certain points, implementation of a calibration scheme to provide a measure of the system gain, control of fringe frequencies, and separation of sidebands for the frequency bands using SIS- mixer input stages.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Richard Thompson "System design for the Millimeter Array", Proc. SPIE 3357, Advanced Technology MMW, Radio, and Terahertz Telescopes, (31 July 1998); https://doi.org/10.1117/12.317379
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