Jeff Francis [email protected]
This is a library to talk to the predict API to extract satellite orbit predictions. Obviously, it's a bit short on documentation, but it follows the predict documenation almost perfectly.
http://www.qsl.net/kd2bd/predict.html
Here's a quick example. First, properly configure and start predict on your local machine. Make sure to include the "-s" flag telling it to turn on the API.:
jfrancis@desktop ~ $ predict -s
Now load the predict package and connect to the server (note than you can also connect to remote servers, as well as servers on non-standard ports - RTSL):
CL-USER> (ql:quickload :predict)
(ql:quickload :predict)
To load "predict":
Load 1 ASDF system:
predict
; Loading "predict"
[package predict]..
(:PREDICT)
CL-USER> (in-package :predict)
#<PACKAGE "PREDICT">
PREDICT> (connect-to-predict)
#<USOCKET:DATAGRAM-USOCKET {1007097CD3}>
PREDICT>
Start with asking predict for a list of satellites currently being tracked:
PREDICT> (get-list)
("HUBBLE" "ISS" "LO-19" "AO-91" "AO-92" "SO-50" "AO-85")
PREDICT>
You can get the current position of a satellite, and the data is returned as an object:
PREDICT> (describe (get-sat "AO-91"))
#<SATELLITE {10072EFE83}>
[standard-object]
Slots with :INSTANCE allocation:
NAME = "AO-91"
TIMESTAMP = 1535761303
LON = 73.39
LAT = -82.21
AZ = 171.99
EL = -64.9
NEXT-AOS-LOS = 1535787950
FOOTPRINT = "5871.93"
RANGE = 12313.15
ALTITUDE = 741.01
VELOCITY = 7.44
ORBIT-NUMBER = 4231
IN-SUNLIGHT = T
VISIBLE = NIL
ORBITAL-PHASE = 246.23
ECLIPSE-DEPTH = -15.07
SQUINT = NIL
; No value
PREDICT>
Likewise, try each of the various functions in the predict documentation, located here:
https://github.com/koansys/predict/tree/master/clients/samples
Each function requires the same parameters as the docs, and returns the same data (though it's returned as objects).
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