Telemetry Receiver System
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Telemetry Receiver System

On August 31, 1999, a contract was award to ATIR U.S., Inc., now doing business as International Meteorological Systems (InterMet Systems)  for the demonstration phase of the Telemetry Receiver System.  The first demonstration unit will undergo testing in April, 2000.  Following successful completion of this effort, a production contract is expected to be awarded in September, 2000.  Field operation of the new system will begin in FY 2001.  

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The Telemetry Receiver System consists of three major components:
Antenna System
Receiver
Data Communications Equipment

The antenna tracks the radiosonde, providing the 1660 - 1700 MHz radio data to the receiver, which down converts the signal  to 10.7 MHz for the Signal Processing System.   The Data Communications Equipment provides a fiber optic link back to the office (within 2000m)  where the main workstation is located, as well as voice communications between the office, antenna location, and launch area.  The receiver is state-of-the-art and uses standard cell-phone components.

Antenna Characteristics:
2.0 meter diameter fiberglass parabolic dish
Lightweight construction
Rugged, corrosion resistant materials
Easy access to subassemblies
Pedestal provides environmentally controlled 19" rack for Data Communications Equipment and Signal Processing System
Use of current NWS radomes will be required
Uses proven, low risk technology

The servoed parabolic dish was chosen due to it's superb performance, low cost, and high reliability.  The usually lower reliability of moving mechanical parts have evolved over the past 10 years to become very reliable mechanisms.    The dish can be split for easier transport.   The low inertia pancake motor drives are maintenance free, lubricated for life. 

The system will include a comprehensive suite of Built-in-test features for both continuous monitoring of the hardware and software states, as well as special off-line diagnostic tests. 

The system is controlled by a central processor, as well as control unit at the launch area.  The Control and Display Unit is ruggedized and weather proof.  It contains a 25-key membrane keyboard, with a 4-line backlit display.   Visual indicators are provided for frequency and signal strength, and selectable to also provide audio indication of signal strength and radiosonde modulation.   An image depicting the control unit is shown below.

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Date Last Modified: December 10, 2001