Trying to fit tracks to an orbit

[josefk934565]

I am trying to use the "fit_arc_blind" function to fit observations for an orbit determination. However I keep getting errors in the "time_ordered_satIDs" function at line 420 in correlate_tracks.py.

It keeps calling for a 'gps' attribute which does not seem to exist in the astropy "Time" object.

import numpy as np
from astropy.time import Time

import ssapy
from ssapy.correlate_tracks import ( fit_arc, fit_arc_blind, fit_arc_blind_via_track )

def sample_arc():
    dtype = [('satID', 'int'), ('rStation_GCRF', 'float', (3,)), ('vStation_GCRF', 'float', (3,)),
             ('time', 'object'), ('ra', 'float'), ('dec', 'float'), ('pmra', 'float'), ('pmdec', 'float')]
    
    times = np.linspace(1451085112, 1451128312, 10)
    arc = np.zeros(10, dtype=dtype)
    arc['satID'] = np.arange(10)
    arc['rStation_GCRF'] = np.random.rand(10, 3)
    arc['vStation_GCRF'] = np.random.rand(10, 3)
    arc['time'] = [Time(t, format='gps') for t in times]
    arc['ra'] = np.random.rand(10)
    arc['dec'] = np.random.rand(10)
    arc['pmra'] = np.random.rand(10)
    arc['pmdec'] = np.random.rand(10)
    return arc

arc = sample_arc()
print(arc['time'])
arc_fit = fit_arc_blind(arc, verbose=True, mode='angle', priors=None, propagator=None, damp=-1, orbitattr=None, optimizerkw={}, lsq=True, factor=2)
print(arc_fit)

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Traceback (most recent call last):
File "/home/dev/ssapy-sandbox312/modules/tracks_test.py", line 25, in
arc_fit = fit_arc_blind(arc, verbose=True, mode='angle', priors=None, propagator=None, damp=-1, orbitattr=None, optimizerkw={}, lsq=True, factor=2)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/dev/ssapy-sandbox312/lib/python3.12/site-packages/ssapy/correlate_tracks.py", line 420, in fit_arc_blind
satids_ordered, times_ordered = time_ordered_satIDs(arc, with_time=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/dev/ssapy-sandbox312/lib/python3.12/site-packages/ssapy/correlate_tracks.py", line 1514, in time_ordered_satIDs
s = np.argsort(data['time'].gps)
^^^^^^^^^^^^^^^^
AttributeError: 'numpy.ndarray' object has no attribute 'gps'