%% Report on AO-40 RUDAK
%% Copyright 2002 Bdale Garbee <bdale@gag.com>
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%% Presented to the AMSAT-UK Colloquium, 27 July 2002, Guildford, Surrey, UK
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Report on AO-40 RUDAK

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Bdale Garbee, KB0G
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<kb0g@amsat.org>


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Objectives


	What is RUDAK?
	Original Objectives
	How Objectives Changed 
	Progress and Current Experiment Status
	DSP Development and Testing
	Future Plans

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What is RUDAK?


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Regenerativer Umsetzer fur 
Digital Amateurfunk Kommunikation


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Communications path to experimental payloads.

Store and forward message handling system.

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What is RUDAK?

Two mostly independent units, each with:
	V53 CPU running SCOS
	16 megabytes ECC RAM
	10 SCC channels, 8 with DMA support
	Modems
		2 9k6 hardwired G3RUH modems
		1 153k6 hardwired BPSK modem
		4 DSP modulators
		4 DSP demodulators
	CAN bus interface
	FIFO between CPUs

4 double-sided, surface-mount PCBs in one box.
27,822 solder joints...  285 screws holding it together...

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Original Objectives


A flexible platform for the ten-year design life of AO-40.

	Communications path to onboard experiments.
		CEDEX
		GPS
		MONITOR
		SCOPE
		SmartNodes
	On-orbit demonstration of new technologies.
		Hardware 153k6 BPSK modem
		DSP modems
	Store and forward capability for users.


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Since Launch

RUDAK hardware has worked perfectly... except...

	RUDAK 9k6 downlinks interfere with the analog passband.

	Signals in the analog passband and the IHU beacon interfere with the RUDAK 9k6 downlinks.

	RUDAK uplinks are less sensitive than expected.

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Operational Difficulties

	RUDAK isn't on all the time.
		Power budget in this orbit and spin mode.
		Failure of V, U, S1 downlinks.
		Need to time-share available downlink capability.

	Uplink signal strength requirements.

	Unexplained software crashes on the B CPU.

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Current Experiment Status

	CAN bus and SmartNode boards work perfectly.

	SCOPE works well.
		Both cameras confirmed operational.
		Two really good set of pictures taken.

	CEDEX yielded useful data.  (stay for Craig's talk!)

	GPS yielded useful data.
		Good observation data from all around the orbit.
		Limits reached until/unless AO-40 3-axis stabilized.

	MONITOR remains untested.

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DSP Software Development and Testing

Progress to date:
	Partially verified DSP and DDS hardware operation.
	Initial ZRO test software, stepped too fast.
	9k6 FSK modulator partially completed.
	Flexible signal generator.
Issues:
	No ground hardware to test code on.
	Long development cycle.
	Limited power restricts DSP testing.
Future:
	RUDAK emulator design complete.
	Want RUDAK on at the same time as the passband!
	Many interesting applications...

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For the Future

	Short-term emphasis will remain experimental.

		On-board data compression to reduce download times.

		DSP Modems

		New SCOPE software with on-camera compression.

		Testing 153k6 modem, with and without FEC.

	SCOPE team direct control of cameras.

	User access to file system.

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This talk is not in your proceedings...



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http://www.gag.com/~bdale/talks/