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host: Properly handle most corner cases in VSWR calculations.

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This commit is contained in:
Alexander Chemeris
2015-08-19 21:21:42 -04:00
parent 9309e3c548
commit 4f909bcfa2
1 changed files with 8 additions and 0 deletions
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8
host/utils/umtrx_vswr.py
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@@ -46,6 +46,8 @@ class umtrx_vswr:
gamma = self._gamma
if gamma == 1.0:
return float("inf")
elif gamma > 1.0:
return float("nan")
else:
return (1+gamma)/(1-gamma)
@@ -54,15 +56,21 @@ class umtrx_vswr:
gamma = self._gamma
if gamma == 1.0:
return float("-inf")
elif gamma > 1.0:
return float("nan")
else:
return -10.0 * math.log(1.0-gamma*gamma, 10)
def pf_rate(self):
''' Estimated reflected power rate, % '''
gamma = self._gamma
if gamma > 1.0:
return float("nan")
return 1.0 - gamma*gamma
def pr_rate(self):
''' Estimated reflected power rate, % '''
gamma = self._gamma
if gamma > 1.0:
return float("nan")
return gamma*gamma