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Resolves #663. Updates P25 phase 2 Decoder to detect PLL lock errors for +/-90 and 180 out-of-phase. Adds support for broadcasting phase 2 channel frequency error calculations to support tuner auto-correction for frequency errors. Removes adaptive PLL bandwidth support from Phase 1 and uses a fixed PLL bandwidth for both phase 1 and phase 2 decoders. Updates the Phase 2 symbol timing gain with results from extensive testing of PLL bandwidth and symbol timing combinations. (#666)

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This commit is contained in:
Denny Sheirer
2020-02-22 20:09:24 +00:00
committed by GitHub
parent 44237bec5c
commit b3b2e74688
182 changed files with 1430 additions and 996 deletions
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105
src/main/java/io/github/dsheirer/dsp/symbol/Dibit.java
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@@ -1,3 +1,25 @@
/*
*
* * ******************************************************************************
* * Copyright (C) 2014-2020 Dennis Sheirer
* *
* * This program is free software: you can redistribute it and/or modify
* * it under the terms of the GNU General Public License as published by
* * the Free Software Foundation, either version 3 of the License, or
* * (at your option) any later version.
* *
* * This program is distributed in the hope that it will be useful,
* * but WITHOUT ANY WARRANTY; without even the implied warranty of
* * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* * GNU General Public License for more details.
* *
* * You should have received a copy of the GNU General Public License
* * along with this program. If not, see <http://www.gnu.org/licenses/>
* * *****************************************************************************
*
*
*/
package io.github.dsheirer.dsp.symbol;
public enum Dibit
@@ -133,6 +155,89 @@ public enum Dibit
return Dibit.D00_PLUS_1;
}
public static enum Rotation {PLUS90, MINUS90, INVERT}
/**
* Returns the value of this dibit if the symbol were rotated in the direction indicated.
*
* This can be used for calculating phase rotation and phase inversion pattern derivatives from a normal sync pattern
* @param rotation to apply to this dibit
* @return rotated version of this dibit
*/
public Dibit rotate(Rotation rotation)
{
switch(this)
{
case D00_PLUS_1:
switch(rotation)
{
case PLUS90:
return Dibit.D01_PLUS_3;
case MINUS90:
return Dibit.D10_MINUS_1;
case INVERT:
return Dibit.D11_MINUS_3;
}
break;
case D01_PLUS_3:
switch(rotation)
{
case PLUS90:
return Dibit.D11_MINUS_3;
case MINUS90:
return Dibit.D00_PLUS_1;
case INVERT:
return Dibit.D10_MINUS_1;
}
break;
case D10_MINUS_1:
switch(rotation)
{
case PLUS90:
return Dibit.D00_PLUS_1;
case MINUS90:
return Dibit.D11_MINUS_3;
case INVERT:
return Dibit.D01_PLUS_3;
}
break;
case D11_MINUS_3:
switch(rotation)
{
case PLUS90:
return Dibit.D10_MINUS_1;
case MINUS90:
return Dibit.D01_PLUS_3;
case INVERT:
return Dibit.D00_PLUS_1;
}
}
//We should never reach this point
return Dibit.D00_PLUS_1;
}
/**
* Returns the dibit that corresponds to the value
* @param value 0-3
* @return representative dibit or Dibit.00 if the value is outside of the range 0-3
*/
public static Dibit fromValue(int value)
{
switch(value)
{
case 0:
default:
return Dibit.D00_PLUS_1;
case 1:
return Dibit.D01_PLUS_3;
case 2:
return Dibit.D10_MINUS_1;
case 3:
return Dibit.D11_MINUS_3;
}
}
public static void main(String[] args)
{
byte a = (byte)0x1B;