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We are the sole point of contact into Cobham for the earth station and large astronomy grade antenna systems. The range of astronomy suitable systems includes antenna sizes ranging from 2m systems up to 12m systems. These are all full motion precision systems with highly accurate pointing capabilities. Cobham’s 12m full motion system is the world most suitable antenna for use in an array. It is entirely controlled via a fiber optic Ethernet port and includes multiple modes of operation and status reporting. A fully comprehensive HMI based operating software package is supplied with each system as a starter package although most users create their own interfaces. An entire array of antennas can be addressed as network nodes and all controlled simultaneously. Typical reflector surface accuracies of our second generation (Gen2) 12m system are 0.012 inches RMS, with 0.005 deg absolute pointing accuracy in 35 mph wind and are suitable for use to Ka band. 9 term error correction models are build in as are multi coordinate entry systems such as Equatorial (RaDec) or Horizon coordinate mode. Extensive diagnostics and monitoring are built in and the control software resides in the programmable drives themselves eliminating the need for a separate and non synchronized ACU. Absolute time is obtained from an SNTP time sever by the control system to ensure that pre-programmed tracking tasks are carried our as required. Basic operation modes include Position, Velocity and Track modes. On the 12m systems, 26 Bit absolute encoders are used for excellent pointing accuracy and resolution, motion ranges are typically +/- 270 Deg in Az and 5 - 88 Deg in El. These 12m systems have been designed for DSN, VLBI and other astronomical applications although they can also be used as highly accurate and versatile earth stations for communications. The Gen 2 new 12m system will also have the industries fastest speed of motion for high speed slewing. Work is also under way looking into 15m offset geometries for SKA applications. |
