Airoscope telemetry system

Details Airoscope telemetry system Airoscope telemetry system

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974tsbb.nasa..299p&link_type=abstract

In its Telescope Systems for Balloon-Borne Res. p 299-308 (SEE N75-12735 03-74)

Astronomy and Astrophysics

Astronomy

Balloon-Borne Instruments, Communication Equipment, Data Links, Digital Systems, High Altitude Balloons, Infrared Astronomy, Radio Telemetry, Data Transmission, Frequency Modulation, Pcm Telemetry, Pulse Code Modulation

Scientific paper

The AIROscope (Ames Infrared Observatory telescope) telemetry system is described from signal conditioning on the gondola to display and storage at the ground station. All analog and digital data from the systems and experiments on the gondola go to a PCM encoder which formats the data into 10-bit words. Therefore, 0.1-percent resolution is inherently available for experimental data. The coded bit stream directly modulates the carrier of the FM transmitter. To insure reliable transmission over a 650-km range an 11-watt FM transmitter operating at 1483.5 MHz is used on the gondola. Modulation is narrow band FM with a maximum deviation of plus or minus 500 kHz. The maximum modulation frequency is determined by the data bit rate which could be as high as 500 kbps. Presently, a rate of 20.48 kbps is used. The ground station receiving system includes a steerable antenna (19-db gain), preamplifier (21-db gain) and receiver. All data are recorded on a tape recorder. The recorded signal then can be played back through the PCM decommutator unit at a later time for detailed data analysis by the experimenter.

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