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108 lines
2.9 KiB
Python
Executable file
108 lines
2.9 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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Test the functions in lib concerning
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beacon generation and phase measuring
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work correctly together.
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"""
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import matplotlib.pyplot as plt
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import numpy as np
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import lib
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seed = 12345
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dt = 1 # ns
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frequency = 52.12345e-3 # GHz
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N = 5e2
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t_clock = 0
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beacon_amplitude = 1
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t = np.arange(0, 10*int(1e3), dt, dtype=float)
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rng = np.random.default_rng(seed)
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# Vary both the base time and the phase
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t_extra = 0
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phase_res = np.zeros(int(N))
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amp_res = np.zeros(int(N))
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for i in range(int(N)):
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# Change timebase
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t -= t_extra
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t_extra = (2*rng.uniform(size=1) - 1) *1e3
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t += t_extra
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# Randomly phased beacon
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phase = lib.phase_mod(np.pi*(2*rng.uniform(size=1) -1)) # rad
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beacon = beacon_amplitude * lib.sine_beacon(frequency, t, t0=0, phase=phase, peak_at_t0=False)
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if False: # blank part of the beacon
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blank_low, blank_high = int(0.2*len(t)), int(0.4*len(t))
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t_mask = np.ones(len(t), dtype=bool)
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t_mask[blank_low:blank_high] = False
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t = t[t_mask]
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beacon = beacon[t_mask]
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# Introduce clock errors
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t += t_clock
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_, measured_phases, measured_amplitudes = lib.find_beacon_in_traces([beacon], t, frequency, frequency_fit=False)
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t -= t_clock
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# Save residuals
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phase_res[i] = lib.phase_mod(measured_phases[0] - phase)
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amp_res[i] = measured_amplitudes[0] - beacon_amplitude
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###
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## Present figures
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###
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phase2time = lambda x: x/(2*np.pi*frequency)
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time2phase = lambda x: 2*np.pi*x*frequency
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fig, ax = plt.subplots()
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ax.set_title("Sine beacon phase determination\nwith random time shifts")
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ax.set_xlabel("$\\varphi_{meas} - \\varphi_{true}$ [rad]")
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ax.set_ylabel("#")
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ax.hist(phase_res, bins='sqrt')
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if True:
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ax.axvline( -1*lib.phase_mod(t_clock*frequency*2*np.pi), color='red', lw=5, alpha=0.8, label='true t_clock')
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if True:
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secax = ax.secondary_xaxis(1.0, functions=(phase2time, time2phase))
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secax.set_xlabel('Time [ns]')
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ax.legend(title='N={:.1e}'.format(len(t)))
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phase_xlims = ax.get_xlim()
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fig.tight_layout()
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amp_xlims = None
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if True:
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fig, ax = plt.subplots()
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ax.set_title("Amplitude")
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ax.set_xlabel("$A_{meas} - 1$")
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ax.set_ylabel("#")
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ax.legend(title='N={:.1e}'.format(len(t)))
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ax.hist(amp_res, bins='sqrt')
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fig.tight_layout()
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amp_xlims = ax.get_xlim()
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if True:
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fig, ax = plt.subplots()
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ax.grid()
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ax.set_xlabel("Phase Res [rad]")
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ax.set_ylabel("Amplitude Res")
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sc = ax.scatter( phase_res, amp_res )
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#fig.colorbar(sc, ax=ax)
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ax.set_xlim(phase_xlims)
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if amp_xlims is not None:
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ax.set_ylim(amp_xlims)
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if True:
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ax.axvline( -1*lib.phase_mod(t_clock*frequency*2*np.pi), color='red', lw=5, alpha=0.8, label='true t_clock')
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if True:
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secax = ax.secondary_xaxis(1.0, functions=(phase2time, time2phase))
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secax.set_xlabel('Time [ns]')
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ax.legend(title='N={:.1e}'.format(len(t)))
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fig.tight_layout()
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plt.show()
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