From b7bac13101ae5caf763d3f3c1bac1d72274ba0c4 Mon Sep 17 00:00:00 2001 From: Dirk Koopman Date: Tue, 12 May 2020 22:42:28 +0100 Subject: [PATCH] updated docs for rbn.pl --- perl/rbn.pl | 47 ++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 44 insertions(+), 3 deletions(-) diff --git a/perl/rbn.pl b/perl/rbn.pl index 70603780..dd69cd28 100755 --- a/perl/rbn.pl +++ b/perl/rbn.pl @@ -121,7 +121,34 @@ while (<$sock>) { # We have an RBN data line, dedupe it very simply on time, ignore QRG completely. # This works because the skimmers are NTP controlled (or should be) and will receive - # the spot at the same time (velocity factor of the atmosphere taken into account :-) + # the spot at the same time (velocity factor of the atmosphere and network delays + # carefully (not) taken into account :-) + + # Note, there is no intelligence here, but there are clearly basic heuristics that could + # be applied at this point that reject (more likely rewrite) the call of a busted spot that would + # useful for a zonal hotspot requirement from the cluster node. + + # In reality, this mechanism would be incorporated within the cluster code, utilising the dxqsl database, + # and other resources in DXSpider, thus creating a zone map for an emitted spot. This is then passed through the + # normal "to-user" spot system (where normal spots are sent to be displayed per user) and then be + # processed through the normal, per user, spot filtering system - like a regular spot. + + # The key to this is deducing the true callsign by "majority voting" (the greater the number of spotters + # the more effective this is) together with some lexical analsys probably in conjuction with DXSpider + # data sources (for singleton spots) to then generate a "centre" from and to zone (whatever that will mean if it isn't the usual one) + # and some heuristical "Kwalitee" rating given distance from the zone centres of spotter, recipient user + # and spotted. A map can be generated once per user and spotter as they are essentially mostly static. + # The spotted will only get a coarse position unless other info is available. Programs that parse + # DX bulletins and the online data online databases could be be used and then cached. + + # Obviously users have to opt in to receiving RBN spots and other users will simply be passed over and + # ignored. + + # Clearly this will only work in the 'mojo' branch of DXSpider where it is possible to pass off external + # data requests to ephemeral or semi resident forked processes that do any grunt work and the main + # process to just the standard "message passing" which has been shown to be able to sustain over 5000 + # per second (limited by the test program's output and network speed, rather than DXSpider's handling). + my $p = "$t|$call"; ++$noraw; next if $d{$p}; @@ -204,11 +231,25 @@ __END__ =head1 NAME -rbn.pl - an experimental RBN filter program that +rbn.pl - an experimental RBN filter program =head1 SYNOPSIS -rbn.pl [options] +rbn.pl [options] + +We read the raw data +from the RBN. We collect similar spots on a frequency within 100hz and try to +deduce which if them is likely to be the true callsign. Emitted spots are cached and thereafter ignored +for a period until it is spotted again, when it may be emitted again - but marked as a RESPOT. + +This is just technology demonstrator designed to scope out the issues and make sure that the line decoding works +in all circumstances. But even on busy weekends it seems to cope just fine deduping away within its limits. + +To see it work at its best, run it as: rbn.pl -stats + +Leave it running for some time, preferably several (10s of) minutes. +You will see it slowly reduce the number of new spots until you start to see "RESPOT" lines. Reductions +of more than one order of magnitude is normal. Particularly when there are many more spotters. =head1 OPTIONS -- 2.34.1