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INDI Library v1.7.9 Released (23 Jun 2019)

INDI Library v1.7.9 is mostly a maintenance release to fix a few bugs in several drivers.

Re: Old Sat Tracking script

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Re: Old Sat Tracking script was created by Ihoujin

There was a python script for attempting to track satellites written a few years back by user Farom.
www.indilib.org/forum/wish-list/1765-sat...nfusion.html?start=0

The script no-longer appears to work properly with ongoing developments. Specifically there are problems importing PyIndi and a depreciated file causing an import error for libindi.so.1.

I would like to get it working again, but coding is not my field of expertise. But I have attempted to make changes to the Geographic Location portion to get Lat/Long by parsing NMEA sentences straight from the GPS. I think it's ok, but I could use a second opinion.
It would also be nice if the TLE information could be fetched automatically.

Here is the Python3 script. Thanks in advance
# --- Settings ---
# Change following parameters according to your need

# Geographic location
import serial
port = "/dev/tty0"
def parseGPS(data):
   if data[0:6] == "$GPRMS":
      sdata = data.split(",")
      latitude = decode(sdata[3])
      longitude = decode(sdata[5])

# Satellite TLE (can be retreived on https://www.space-track.org)
TLE_line_1 = '1 25544U 98067A   19136.87606988  .00001918  00000-0  37995-4 0  9998'
TLE_line_2 = '2 25544  51.6418 156.7644 0001513   1.2176  59.1588 15.52681763170397'

# INDI settings
host = 'localhost'
port = 7624
driver_name ="Telescope Simulator"

# Script settings
update_delay = 1 # delay in s between updates

# --- Code ---
import PyIndi
import time
import sys
import threading
import ephem
from math import pi

# default client
class IndiClient(PyIndi.BaseClient):
    def __init__(self):
        super(IndiClient, self).__init__()
    def newDevice(self, d):
        pass
    def newProperty(self, p):
        pass
    def removeProperty(self, p):
        pass
    def newBLOB(self, bp):
        pass
    def newSwitch(self, svp):
        pass
    def newNumber(self, nvp):
        pass
    def newText(self, tvp):
        pass
    def newLight(self, lvp):
        pass
    def newMessage(self, d, m):
        pass
    def serverConnected(self):
        pass
    def serverDisconnected(self, code):
        pass

    
# connect the server
print("Connection to " + host + ":" + str(port) + " ... ", end='')
indiclient=IndiClient()
indiclient.setServer(host,port)
if (not(indiclient.connectServer())):
    print("FAILED")  
    print("No indiserver running on "+indiclient.getHost()+":"+str(indiclient.getPort()))
    sys.exit(1)
print("OK")

# get the telescope device
print("Get driver '"+ driver_name + "' ... ", end='')
device_telescope=None
telescope_connect=None
device_telescope=indiclient.getDevice(driver_name)
while not(device_telescope):
    time.sleep(0.5)
    device_telescope=indiclient.getDevice(driver_name)
print("OK")

# wait CONNECTION property be defined for telescope
print("Wait CONNECTION property be defined ... ", end='')
telescope_connect=device_telescope.getSwitch("CONNECTION")
while not(telescope_connect):
    time.sleep(0.5)
    telescope_connect=device_telescope.getSwitch("CONNECTION")
print("OK")

# if the telescope device is not connected, we do connect it
if not(device_telescope.isConnected()):
    print("Driver not connected, try to connect it ... ", end='')
    # Property vectors are mapped to iterable Python objects
    # Hence we can access each element of the vector using Python indexing
    # each element of the "CONNECTION" vector is a ISwitch
    telescope_connect[0].s=PyIndi.ISS_ON  # the "CONNECT" switch
    telescope_connect[1].s=PyIndi.ISS_OFF # the "DISCONNECT" switch
    indiclient.sendNewSwitch(telescope_connect) # send this new value to the device
    t=10
    while not(device_telescope.isConnected()) and t>0:
        time.sleep(1)
        t-=1
    if not(device_telescope.isConnected()):
        print("FAILED")  
        print("Failed to connect the driver")
        sys.exit(1)
    print("OK")

# We want to set the ON_COORD_SET switch to engage tracking after goto
# device.getSwitch is a helper to retrieve a property vector
print("Set tracking mode ... ", end='')
telescope_on_coord_set=device_telescope.getSwitch("ON_COORD_SET")
while not(telescope_on_coord_set):
    time.sleep(0.5)
    telescope_on_coord_set=device_telescope.getSwitch("ON_COORD_SET")
# the order below is defined in the property vector, look at the standard Properties page
# or enumerate them in the Python shell when you're developing your program
telescope_on_coord_set[0].s=PyIndi.ISS_ON  # TRACK
telescope_on_coord_set[1].s=PyIndi.ISS_OFF # SLEW
telescope_on_coord_set[2].s=PyIndi.ISS_OFF # SYNC
indiclient.sendNewSwitch(telescope_on_coord_set)
telescope_radec=device_telescope.getNumber("EQUATORIAL_EOD_COORD")
while not(telescope_radec):
    time.sleep(0.5)
    telescope_radec=device_telescope.getNumber("EQUATORIAL_EOD_COORD")
print("OK")

# Configure PyEphem
print("Configure PyEphem ... ", end='')
obs = ephem.Observer()
obs.lon = longitude
obs.lat = latitude
satellite = ephem.readtle('TARGET',TLE_line_1,TLE_line_2)
print("OK")

while 1:
    # compute satellite coordinates
    obs.date = ephem.now()
    satellite.compute(obs)
    print(obs.date)
    print("    RA: ",satellite.ra)
    print("    DEC:",satellite.dec)
    print("    ALT:",satellite.alt)
    print("    AZ: ",satellite.az)

    # We set the desired coordinates
    telescope_radec[0].value=ephem.hours(satellite.ra)*24/2/pi
    telescope_radec[1].value=ephem.degrees(satellite.dec)*360/2/pi
    indiclient.sendNewNumber(telescope_radec)

    time.sleep(update_delay)   


When I run the script, this is what I get back
Traceback (most recent call last):
  File "trackgps.py", line 26, in <module>
    import PyIndi
  File "/home/astropi/.local/lib/python3.5/site-packages/pyindi_client-0.1.0a1-py3.5-linux-armv7l.egg/PyIndi.py", line 28, in <module>
    _PyIndi = swig_import_helper()
  File "/home/astropi/.local/lib/python3.5/site-packages/pyindi_client-0.1.0a1-py3.5-linux-armv7l.egg/PyIndi.py", line 24, in swig_import_helper
    _mod = imp.load_module('_PyIndi', fp, pathname, description)
  File "/usr/lib/python3.5/imp.py", line 242, in load_module
    return load_dynamic(name, filename, file)
  File "/usr/lib/python3.5/imp.py", line 342, in load_dynamic
    return _load(spec)
ImportError: libindi.so.1: cannot open shared object file: No such file or directory
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
2 months 1 day ago #39191

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  • Posts: 18
  • Karma: 1
  • Thank you received: 14

Replied by farom on topic Re: Old Sat Tracking script

I am actually working on a software dedicated to the tracking of satellites based on this. Unfortunately it's not yet ready to be released, some features are missing and it only kinda work for my specific setup. I have to look at the variable tracking operation of typical drivers such as EQMOD to make it compatible.
Here is a preview of the interface:

Github

I tracked 4 O3B satellites . The tracking is pretty stable with most of the error being caused by the periodic error of the mount.

(30x15s per satellite, Orion 203/1000 on SkyViewPro, Canon 1000D)
The following user(s) said Thank You: knro, jerry
1 month 2 weeks ago #39834
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