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Utility for calculating PLL phase lock sync pattern derivatives

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Denny
2020-02-14 06:11:15 -05:00
parent 9c8d87ec64
commit 9af7a184ad
1 changed files with 71 additions and 0 deletions
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src/main/java/io/github/dsheirer/dsp/psk/pll/QPSKPhaseInversionCalculator.java Normal file
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/*
*
* * ******************************************************************************
* * 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.psk.pll;
/**
* Utility for calculating phase inverted sync pattern derivatives for QPSK constellations
*/
public class QPSKPhaseInversionCalculator
{
public static String[] LOOKUP_MINUS_90 = {"A","8","B","9","2","0","3","1","E","C","F","D","6","4","7","5"};
public static String[] LOOKUP_PLUS_90 = {"5","7","4","6","D","F","C","E","1","3","0","2","9","B","8","A"};
public static String[] LOOKUP_180 = {"F","E","D","C","B","A","9","8","7","6","5","4","3","2","1","0"};
public static void main(String[] args)
{
//DMR sync patterns
String[] syncs = {"755FD7DF75F7", "DFF57D75DF5D", "7F7D5DD57DFD", "D5D7F77FD757", "77D55F7DFD77",
"5D577F7757FF", "F7FDD5DDFD55", "7DFFD5F55D5F", "D7557F5FF7F5", "DD7FF5D757DD"};
for(String sync: syncs)
{
StringBuilder sbNorm = new StringBuilder();
StringBuilder sbP90 = new StringBuilder();
StringBuilder sbM90 = new StringBuilder();
StringBuilder sb180 = new StringBuilder();
for(char letter: sync.toCharArray())
{
int value;
if(Character.isAlphabetic(letter))
{
value = letter - 55;
}
else
{
value = letter - 48;
}
sbNorm.append(letter);
sbP90.append(LOOKUP_PLUS_90[value]);
sbM90.append(LOOKUP_MINUS_90[value]);
sb180.append(LOOKUP_180[value]);
}
System.out.println("NORMAL: " + sync);
System.out.println(" +90: " + sbP90.toString());
System.out.println(" -90: " + sbM90.toString());
System.out.println(" 180: " + sb180.toString());
}
}
}