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Added RMS error plotting to measured results. Theoretical is still a WiP.

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This commit is contained in:
Luke 2018-08-01 13:05:02 -07:00
parent 852f4cad1d
commit 54f1c18e07
5 changed files with 235 additions and 42 deletions
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24
tankComputers.py
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@ -15,15 +15,15 @@ def ang_unwrap(volt_tf):
def dB10(pwr_tf):
"""Describe power gain of a transfer function in dB (i.e. 10log(x))"""
return 10*np.log10(np.abs(pwr_tf))
def dB2Vlt(dB20_value):
return np.power(10,dB20_value/20)
def wrap_rads(angles):
return np.mod(angles+np.pi,2*np.pi)-np.pi
def atand(x):
return 180/np.pi*np.arctan(x)
def setLimitsTicks(ax, data, steps):
targs = np.array([1, 2, 4, 5, 10, 20, 30, 50, 60, 100, 250, 1000])
lo = np.min(data)
@ -36,7 +36,7 @@ def setLimitsTicks(ax, data, steps):
marks = np.arange(0,steps+1)*step_size + lo
ax.set_ylim((lo,hi))
ax.set_yticks(marks)
def rms_v_bw(err_sig, bandwidth_scale=1):
"""compute the rms vs bandwidth assuming a fixed center frequency"""
# First compute the error power
@ -63,3 +63,19 @@ def rms_v_bw(err_sig, bandwidth_scale=1):
rms = np.sqrt(np.cumsum(folded,0) / (ind*np.ones((folded.shape[1],1))).T )
return (frac_step*bandwidth_scale, rms)
def delta_rms(signal, reference_delta, wrap_point=2*np.pi):
"""compute the rms difference between various states and a reference"""
# First compute the matrix difference including folding
signal_delta = np.column_stack((
signal[:,1:]-signal[:,:-1],
signal[:,0]-signal[:,-1]
))
signal_delta = np.where(signal_delta>wrap_point/2, \
signal_delta-wrap_point, signal_delta)
signal_delta = np.where(signal_delta<-wrap_point/2, \
signal_delta+wrap_point, signal_delta)
signal_error = np.abs(signal_delta)-reference_delta
signal_rms = np.sqrt(np.mean(np.power(signal_error,2),1))
return signal_rms