mirror of
https://gitlab.science.ru.nl/mthesis-edeboone/m-thesis-introduction.git
synced 2024-11-13 10:03:32 +01:00
120 lines
4 KiB
Python
Executable file
120 lines
4 KiB
Python
Executable file
#!/usr/bin/env python3
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# vim: fdm=indent ts=4
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import h5py
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from itertools import combinations, zip_longest
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import matplotlib.pyplot as plt
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import numpy as np
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import aa_generate_beacon as beacon
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import lib
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if __name__ == "__main__":
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from os import path
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import sys
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fname = "ZH_airshower/mysim.sry"
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c_light = 3e8*1e-9
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show_plots = not True
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ref_ant_id = None # leave None for all baselines
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####
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fname_dir = path.dirname(fname)
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antennas_fname = path.join(fname_dir, beacon.antennas_fname)
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time_diffs_fname = 'time_diffs.hdf5' if not True else antennas_fname
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if not path.isfile(antennas_fname):
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print("Antenna file cannot be found, did you try generating a beacon?")
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sys.exit(1)
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# Read in antennas from file
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f_beacon, tx, antennas = beacon.read_beacon_hdf5(antennas_fname)
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# run over all baselines
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if ref_ant_id is None:
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print("Doing all baselines")
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baselines = list(combinations(antennas,2))
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# use ref_ant
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else:
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ref_ant = antennas[ref_ant_id]
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print(f"Doing all baselines with {ref_ant.name}")
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baselines = list(zip_longest([], antennas, fillvalue=ref_ant))
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# For now, only one beacon_frequency is supported
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freq_names = antennas[0].beacon_info.keys()
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if len(freq_names) > 1:
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raise NotImplementedError
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freq_name = next(iter(freq_names))
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# Get phase difference per baseline
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phase_diffs = np.empty( (len(baselines), 2) )
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for i, base in enumerate(baselines):
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if i%50==0:
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print(i, "out of", len(baselines))
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# read f_beacon from the first antenna
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f_beacon = base[0].beacon_info[freq_name]['freq']
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# Get true phase diffs
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try:
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true_phases = np.array([ant.beacon_info[freq_name]['phase'] for ant in base])
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true_phases_diff = lib.phase_mod(lib.phase_mod(true_phases[1]) - lib.phase_mod(true_phases[0]))
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except IndexError:
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# true_phase not determined yet
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print(f"Missing true_phases for {freq_name} in baseline {base[0].name},{base[1].name}")
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true_phases_diff = np.nan
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# save phase difference with antenna names
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phase_diffs[i] = [f_beacon, true_phases_diff]
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# Read actual phases from antenna hdf5
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actual_antenna_phases = { a.name: 2*np.pi*a.attrs['clock_offset']*f_beacon for a in antennas }
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# Compare actual time shifts
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my_phase_diffs = []
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for i,b in enumerate(baselines):
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actual_phase_diff = lib.phase_mod( lib.phase_mod(actual_antenna_phases[b[1].name]) - lib.phase_mod(actual_antenna_phases[b[0].name]))
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if True: # remove time axis phase difference
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t0s = np.array([ant.t_AxB[0] for ant in base])
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delta_t0 = t0s[1] - t0s[1]
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actual_phase_diff = lib.phase_mod( actual_phase_diff - lib.phase_mod(delta_t0*2*np.pi*f_beacon))
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my_phase_diffs.append(actual_phase_diff)
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# Make a plot
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if True:
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N_base = len(baselines)
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N_ant = len(antennas)
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phase_residuals = lib.phase_mod(phase_diffs[:,1] - my_phase_diffs)
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fig, axs = plt.subplots(2, 1, sharex=True)
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axs[0].set_title("Measured phase difference - Actual phase difference")
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axs[0].set_xlabel("Phase residuals $\\varphi$")
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if True:
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forward = lambda x: x/(2*np.pi*f_beacon)
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inverse = lambda x: 2*np.pi*x*f_beacon
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secax = axs[0].secondary_xaxis('top', functions=(forward, inverse))
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secax.set_xlabel('$\\varphi/(2\\pi f_{beacon})$ [ns]')
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i=0
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axs[i].set_ylabel("#")
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axs[i].hist(phase_residuals, bins='sqrt', density=False)
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i=1
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axs[i].set_ylabel("Baseline combination #")
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if not True:
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axs[i].plot(my_phase_diffs, np.arange(N_base), ls='none', marker='+', label='actual time shifts')
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l = axs[i].plot(phase_diffs[:,1], np.arange(N_base), ls='none', marker='x', label='calculated')
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axs[i].legend()
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else:
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axs[i].plot(phase_residuals, np.arange(N_base), ls='none', marker='x')
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plt.show()
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