[aprssig] Predict

Andrew Rich vk4tec at people.net.au
Wed Nov 7 22:15:45 EST 2007

Predict is a command like thing.

It has a socket that lets programs talk to it.

I use PERL to ask it questions. You can find several graphics programs to
talk to it as well.

I even ran a java one the other day - think it was called Jpredict.


predict (from a shell) will let you track in a text screen.

predict -s (from a shell) runs it in server mode - lets you talk to port

#!/usr/bin/perl -w
use CGI;
use Socket;
use GD;

my $port = 1210;
my ($predict_server, $satellite);


$satellite ="ISS";
$predict_server = "localhost";
my ($d1, $d2, $d3, $d4, $rawserver) = gethostbyname($predict_server);
my $serveraddr = pack("Sna4x8", 2, $port, $rawserver);
my $prototype = getprotobyname('udp');
socket(SOCKET,2,SOCK_DGRAM,$prototype) || die("No Socket\n");
$| = 1;  # no buffering
$SIG{ALRM} = \&time_out;
alarm(10);  # Force exit if no response from server
send(SOCKET, "GET_SAT $satellite\0" , 0 , $serveraddr) or die("UDP send
failed $!\n");
my $server_response = '';  # required by recv function
recv(SOCKET, $server_response, 100, 0) or die "UDP recv failed $!\n";
my ($name, $lat, $lon, $az, $el, $aos_seconds, $foot) = split /\n/,
#print $lat." ".$lon."\n";
my $aos_time_date = gmtime($aos_seconds);

Andrew Rich VK4TEC
vk4tec at people.net.au <mailto:vk4tec at people.net.au>

-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of James Jolin
Sent: Thursday, 8 November 2007 9:45 AM
To: TAPR APRS Mailing List
Subject: [aprssig] Predict

Anyone on this list know how to get Predict to run on linux?  I have
made a "shortcut" and when I click on it nothing happens.  I see Andrew
Rich has it running so I know it works.

aprssig mailing list
aprssig at lists.tapr.org

More information about the aprssig mailing list