refactoring: removed duplicate code

src/main/java/de/serosystems/lib1090/decoding/AirbornePosition.java

@@ -0,0 +1,155 @@
+package de.serosystems.lib1090.decoding;
+
+import de.serosystems.lib1090.msgs.adsb.AirborneOperationalStatusV1Msg;
+
+/**
+ * @author Markus Fuchs ([email protected])
+ */
+public final class AirbornePosition {
+
+ private AirbornePosition() {}
+
+ /**
+ * Values according to DO-260B Table N-11
+ * @return Navigation integrity category. A NIC of 0 means "unkown".
+ */
+ public static byte decodeNIC(byte formatTypeCode, boolean nicSupplA) {
+ switch (formatTypeCode) {
+ case 9: case 20: return 11;
+ case 10: case 21: return 10;
+ case 11: return (byte) (nicSupplA ? 9 : 8);
+ case 12: return 7;
+ case 13: return 6;
+ case 14: return 5;
+ case 15: return 4;
+ case 16: return (byte) (nicSupplA ? 3 : 2);
+ case 17: return 1;
+ // case 0: case 18: case 22: return 0;
+ default: return 0;
+ }
+ }
+
+ /**
+ * The position error, i.e., 95% accuracy for the horizontal position. For the navigation accuracy category
+ * (NACp) see {@link AirborneOperationalStatusV1Msg}. Values according to DO-260B Table N-11.
+ *
+ * The horizontal containment radius is also known as "horizontal protection level".
+ *
+ * @return horizontal containment radius limit in meters. A return value of -1 means "unknown".
+ * If aircraft uses ADS-B version 1+, set NIC supplement A from Operational Status Message
+ * for better precision.
+ */
+ public static double decodeHCR(byte formatTypeCode, boolean nicSupplA) {
+ switch (formatTypeCode) {
+ case 9: case 20: return 7.5;
+ case 10: case 21: return 25;
+ case 11: return nicSupplA ? 75.0 : 185.2;
+ case 12: return 370.4;
+ case 13: return nicSupplA ? 1111.2 : 926;
+ case 14: return 1852;
+ case 15: return 3704;
+ case 16: return nicSupplA ? 7408 : 14816;
+ case 17: return 37040;
+ // case 0: case 18: case 22: return -1;
+ default: return -1;
+ }
+ }
+
+ /**
+ * According to DO-260B Table N-4
+ *
+ * @param formatTypeCode the messages' format type code
+ * @return the derived HCR
+ */
+ public static double typeCodeToHCR(byte formatTypeCode) {
+ switch (formatTypeCode) {
+ case 9: case 20: return 7.5;
+ case 10: case 21: return 25;
+ case 11: return 185.2;
+ case 12: return 370.4;
+ case 13: return 926;
+ case 14: return 1852;
+ case 15: return 3704;
+ case 16: return 18520;
+ case 17: return 37040;
+ // case 0: case 18: case 22: return -1;
+ default: return -1;
+ }
+ }
+
+ /**
+ * According to DO-260B Table N-7
+ *
+ * @param formatTypeCode the messages' format type code
+ * @return the derived NACp
+ */
+ public static byte typeCodeToNACp(byte formatTypeCode) {
+ switch (formatTypeCode) {
+ case 9: case 20: return 11;
+ case 10: case 21: return 10;
+ case 11: return 8;
+ case 12: return 7;
+ case 13: return 6;
+ case 14: return 5;
+ case 15: return 4;
+ case 16: case 17: return 1;
+ // case 0: case 18: case 22: return 0;
+ default: return 0;
+ }
+ }
+
+ /**
+ * According to DO-260B Table N-7
+ *
+ * @param formatTypeCode the messages' format type code
+ * @return the derived position uncertainty in meters
+ */
+ public static double typeCodeToPositionUncertainty(byte formatTypeCode) {
+ switch (formatTypeCode) {
+ case 9: return 3;
+ case 10: return 10;
+ case 11: return 92.6;
+ case 12: return 185.2;
+ case 13: return 463;
+ case 14: return 926;
+ case 15: return 1852;
+ case 16: return 9260;
+ case 17: return 18520;
+ // case 0: case 18: case 22: return -1;
+ default: return -1;
+ }
+ }
+
+ /**
+ * According to DO-260B Table 2-200.
+ *
+ * @param formatTypeCode the messages' format type code
+ * @return the derived NIC
+ */
+ public static byte typeCodeToNIC(byte formatTypeCode) {
+ switch (formatTypeCode) {
+ case 9: case 20: return 11;
+ case 6: case 10: case 21: return 10;
+ case 7: case 11: return 8;
+ case 12: return 7;
+ case 13: return 6;
+ case 14: return 5;
+ case 15: return 4;
+ case 16: case 17: return 1;
+ // case 0: case 18: case 22: return 0;
+ default: return 0;
+ }
+ }
+
+ /**
+ * According to DO-260B Table N-8.
+ * @param formatTypeCode the messages' format type code
+ * @return the derived SIL
+ */
+ public static byte typeCodeToSIL(byte formatTypeCode) {
+ switch (formatTypeCode) {
+ case 0: case 18: case 22: return 0;
+ default: return 2;
+ }
+ }
+}

src/main/java/de/serosystems/lib1090/decoding/Airspeed.java

@@ -0,0 +1,30 @@
+package de.serosystems.lib1090.decoding;
+
+/**
+ * @author Markus Fuchs ([email protected])
+ */
+public final class Airspeed {
+
+ private Airspeed() {}
+
+ /**
+ * The 95% accuracy for horizontal velocity. We interpret the coding according to
+ * DO-260B Table 2-22 for all ADS-B versions.
+ * @return Navigation Accuracy Category for velocity according to RTCA DO-260B 2.2.3.2.6.1.5 in m/s, -1 means
+ * "unknown" or >10m
+ */
+ public static double decodeNACv(byte navigationAccuracyCategory) {
+ switch(navigationAccuracyCategory) {
+ case 1:
+ return 10;
+ case 2:
+ return 3;
+ case 3:
+ return 1;
+ case 4:
+ return 0.3F;
+ default:
+ return -1;
+ }
+ }
+}

src/main/java/de/serosystems/lib1090/decoding/OperationalStatus.java

@@ -27,4 +27,63 @@ public static double nacPtoEPU(byte nacPos) {
  default: return -1;
  }
  }
+
+ /**
+ * According to DO-260B Table 2-74. Compatible with ADS-B version 1 and 2
+ * @return the airplane's length in meters; -1 for unknown
+ */
+ public static int decodeAirplaneLength(byte airplaneLenWidth) {
+ switch (airplaneLenWidth) {
+ case 1:
+ return 15;
+ case 2:
+ case 3:
+ return 25;
+ case 4:
+ case 5:
+ return 35;
+ case 6:
+ case 7:
+ return 45;
+ case 8:
+ case 9:
+ return 55;
+ case 10:
+ case 11:
+ return 65;
+ case 12:
+ case 13:
+ return 75;
+ case 14:
+ case 15:
+ return 85;
+ default:
+ return -1;
+ }
+ }
+
+ /**
+ * According to DO-260B Table 2-74. Compatible with ADS-B version 1 and 2.
+ * @return the airplane's width in meters
+ */
+ public static double decodeAirplaneWidth(byte airplaneLenWidth) {
+ switch (airplaneLenWidth) {
+ case 1: return 23;
+ case 2: return 28.5;
+ case 3: return 34;
+ case 4: return 33;
+ case 5: return 38;
+ case 6: return 39.5;
+ case 7: return 45;
+ case 8: return 45;
+ case 9: return 52;
+ case 10: return 59.5;
+ case 11: return 67;
+ case 12: return 72.5;
+ case 13: return 80;
+ case 14: return 80;
+ case 15: return 90;
+ default: return -1;
+ }
+ }
 }