ChirpChat demod: optimize SFD detection

2026-06-13 19:28:41 -04:00 · 2024-04-05 14:43:17 +02:00
parent 788df1eda3
commit 1691a3dfb3
1 changed files with 3 additions and 1 deletions
@@ -286,8 +286,10 @@ void ChirpChatDemodSink::processSample(const Complex& ci)

            m_preambleHistory[m_chirpCount] = imax;
            m_chirpCount++;
+            double preDrop = magsqPre - magsqSFD;
+            double dropRatio = -preDrop / magsqSFD;

-            if (magsqPre <  magsqSFD) // preamble drop
+            if ((preDrop <  0.0) && (dropRatio > 0.5)) // preamble drop
            {
                m_magsqTotalAvg(magsqSFDTotal);