Accession Number:

AD0694876

Title:

THE DESIGN OF SWEPT-FREQUENCY TOPSIDE SOUNDERS,

Descriptive Note:

Corporate Author:

COMMUNICATIONS RESEARCH CENTRE OTTAWA (ONTARIO)

Personal Author(s):

• Franklin,Colin A.
• Maclean,Michael A.

Report Date:

1969-03-24

Pagination or Media Count:

29.0

Abstract:

The paper is concerned with the design and engineering aspects of the topside sounders in the Alouette and ISIS satellites. It is shown how the requirements of the experiment and the limitations of the spacecraft and its environment determine the design of the instrumentation. The evolution of the swept-frequency sounders is traced from the first sounder, flown in the Alouette I satellite, to the more sophisticated ones in Alouette II and ISIS-I, and engineering problems of particular interest or difficulty are described in detail. Finally, there is a discussion of how these techniques might be extrapolated in a sounder designed to explore very distant regions in the earths magnetosphere. Author

Descriptors:

• *ATMOSPHERIC SOUNDING
• *SCIENTIFIC SATELLITES
• DATA TRANSMISSION SYSTEMS
• TELEMETER SYSTEMS
• TELEMETERING ANTENNAS
• RADIO WAVES
• ELECTROMAGNETIC PULSES
• PULSES
• DIPOLE ANTENNAS
• PULSE INTEGRATORS
• RADIOFREQUENCY OSCILLATORS
• MIXERS(ELECTRONICS)
• VERY LOW FREQUENCY
• RADIO RECEIVERS
• WAVEFORM GENERATORS
• MAGNETOSPHERE
• CANADA

Subject Categories:

• Atmospheric Physics
• Electrical and Electronic Equipment
• Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE