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Avoid divide by zero, which can block demod

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This commit is contained in:
Jon Beniston
2026-08-04 01:18:01 +01:00
parent 80ef2b2847
commit a67629c6da
1 changed files with 12 additions and 3 deletions
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plugins/channelrx/demodinmarsat/inmarsatdemodsink.cpp
+12 -3
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@@ -325,7 +325,9 @@ InmarsatDemodSink::InmarsatDemodSink(InmarsatDemod *stdCDemod) :
m_symbolCounter(0),
m_syncedToUW(false),
m_equalizer(nullptr),
m_evm(0.0f),
m_costasLoop(10*2*M_PI/100.0, 2),
m_locked(false),
m_rrcBufferIndex(0),
m_sampleBufferIndexA(0),
m_sampleBufferIndexB(0)
@@ -528,9 +530,16 @@ void InmarsatDemodSink::processOneSample(Complex &ci)
// Determine whether Costas loop is locked - BPSK so Q part should average as zero when locked, and will be similar to I when not locked
Real derotMag = abs(m_derot);
Real iNorm = abs(m_derot.real()) / derotMag;
Real qNorm = abs(m_derot.imag()) / derotMag;
m_lockAverage(iNorm - qNorm);
if (derotMag != 0.0f)
{
Real iNorm = abs(m_derot.real()) / derotMag;
Real qNorm = abs(m_derot.imag()) / derotMag;
m_lockAverage(iNorm - qNorm);
}
else
{
m_lockAverage(0.0f);
}
float lockThresh = 0.45;
m_locked = m_lockAverage.instantAverage() > lockThresh;