NDLI: Airoscope telemetry system. [development of data link from balloon gondola to ground station

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Airoscope telemetry system. [development of data link from balloon gondola to ground station

Content Provider	NASA Technical Reports Server (NTRS)
Author	Pitts, K. J.
Copyright Year	1974
Description	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.
File Size	3830946
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750004690
Archival Resource Key	ark:/13960/t3b03xk90
Language	English
Publisher Date	1974-11-01
Access Restriction	Open
Subject Keyword	Communications And Radar Data Links Communication Equipment Frequency Modulation Balloon-borne Instruments Digital Systems Radio Telemetry Pcm Telemetry High Altitude Balloons Data Transmission Infrared Astronomy Pulse Code Modulation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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