NDLI: Radio links for the nasa abts (Document No: 19980211150)

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Radio links for the nasa abts (Document No: 19980211150)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Jeutter, Dean C.
Copyright Year	1996
Description	The closed loop prototype has operational bi-directional wireless links. The Wideband PCM-FSK receiver has been designed and characterized. Now that both links function, communication performance can be addressed. For example, noise problems with the received outlink signal that caused the PC program to lockup were just recently revealed and minimized by software "enhancements" to the Windows based PC program. A similar problem with inlink communication was uncovered several days before this report: A noise spike or dropout (expected events in the animal Habitat) caused an interrupt to the implant microcontroller which halted outlink transmission. Recovery of outlink transmission did not reliably occur. The problem has been defined and implant software is being modified to better recognize noise from data by changing the timing associated with valid data packet identification and by better utilizing the error flags generated by the microcontroller's SCI circuits. Excellent inlink performance will also require improvements in the implant's receiver. The biggest performance improvement can be provided by antenna design for the Habitat. The quarter wavelength whip antennas used with the demo prototype inlink leave much to be desired.
File Size	745871
Page Count	31
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980211150
Archival Resource Key	ark:/13960/t6741q59n
Language	English
Publisher Date	1996-12-11
Access Restriction	Open
Subject Keyword	Communications And Radar Broadband Circuits Receivers Implantation Feedback Control Computer Programs Augmentation Data Links Errors Antenna Design Frequency Shift Keying Whip Antennas Communication Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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