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GGA, GST és RMC nmea mondat értelemző refraktorálás

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torok.istvan 2026-05-19 00:37:18 +02:00
parent 20a8078f3c
commit 53888c9dcb
3 changed files with 127 additions and 55 deletions
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62
lib/gnss_sentences/gngga.dart
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@ -1,35 +1,55 @@
import 'package:nmea/nmea.dart'; import 'package:nmea/nmea.dart';
class Gngga extends TalkerSentence { class Gngga extends TalkerSentence {
static const String id = "GNGGA"; static const String id = "GxGGA";
Gngga({required super.raw}); Gngga({required super.raw});
@override @override
bool get valid => super.valid && fields.length == 15; bool get valid => super.valid && fields.length >= 15;
String get utcOfPositionFix => fields[1]; String get utcOfPositionFix => _field(1);
int get gpsQualityIndicator => int.parse(fields[6]); int get gpsQualityIndicator => _parseInt(_field(6), fallback: 0);
double get latitude => _getCoordinateFromGpsLatitude(fields[2]); String get latitudeDirection => _field(3).toUpperCase();
String get latitudeDirection => fields[3]; double get latitude => _parseLatitude(_field(2), latitudeDirection) ?? 0.0;
double get longitude => _getCoordinateFromGpsLongitude(fields[4]); String get longitudeDirection => _field(5).toUpperCase();
String get longitudeDirection => fields[5]; double get longitude => _parseLongitude(_field(4), longitudeDirection) ?? 0.0;
int get numberOfSvsInUse => int.parse(fields[7]); int get numberOfSvsInUse => _parseInt(_field(7), fallback: 0);
double get hdop => double.parse(fields[8]); double get hdop => _parseDouble(_field(8), fallback: 0.0);
double get altitudeAboveMeanSeaLevel => double.parse(fields[9]); double get altitudeAboveMeanSeaLevel =>
double get geoidSeparation => double.parse(fields[11]); _parseDouble(_field(9), fallback: 0.0);
double get geoidSeparation => _parseDouble(_field(11), fallback: 0.0);
double _getCoordinateFromGpsLongitude(String coordinate) { String _field(int index) {
double result = if (index < 0 || index >= fields.length) return '';
double.parse("${coordinate[0]}${coordinate[1]}${coordinate[2]}") +
double.parse(coordinate.substring(3)) / 60;
return result; return fields[index].trim();
} }
double _getCoordinateFromGpsLatitude(String coordinate) { int _parseInt(String value, {required int fallback}) {
double result = double.parse("${coordinate[0]}${coordinate[1]}") + return int.tryParse(value) ?? fallback;
double.parse(coordinate.substring(2)) / 60; }
return result; double _parseDouble(String value, {required double fallback}) {
return double.tryParse(value) ?? fallback;
}
double? _parseLatitude(String value, String direction) {
if (value.length < 4) return null; // ddmm.mmmm
final deg = double.tryParse(value.substring(0, 2));
final min = double.tryParse(value.substring(2));
if (deg == null || min == null) return null;
final result = deg + (min / 60.0);
return direction == 'S' ? -result : result;
}
double? _parseLongitude(String value, String direction) {
if (value.length < 5) return null; // dddmm.mmmm
final deg = double.tryParse(value.substring(0, 3));
final min = double.tryParse(value.substring(3));
if (deg == null || min == null) return null;
final result = deg + (min / 60.0);
return direction == 'W' ? -result : result;
} }
} }

39
lib/gnss_sentences/gngst.dart
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@ -1,18 +1,37 @@
import 'package:nmea/nmea.dart'; import 'package:nmea/nmea.dart';
class Gngst extends TalkerSentence { class Gngst extends TalkerSentence {
static const String id = "GNGST"; static const String id = 'GxGST';
Gngst({required super.raw}); Gngst({required super.raw});
@override @override
bool get valid => super.valid && fields.length == 9; bool get valid => super.valid && fields.length >= 9;
String get utcOfPositionFix => fields[1]; String get utcOfPositionFix => _field(1);
double get rms => double.parse(fields[2]);
double get errorEllipseSemiMajorAxis => double.parse(fields[3]); double get rms => _parseDouble(_field(2), fallback: 0.0);
double get errorEllipseSemiMinorAxis => double.parse(fields[4]);
double get errorEllipseOrientation => double.parse(fields[5]); double get errorEllipseSemiMajorAxis =>
double get longitudeError => double.parse(fields[6]); _parseDouble(_field(3), fallback: 0.0);
double get latitudeError => double.parse(fields[7]);
double get heightError => double.parse(fields[8]); double get errorEllipseSemiMinorAxis =>
_parseDouble(_field(4), fallback: 0.0);
double get errorEllipseOrientation => _parseDouble(_field(5), fallback: 0.0);
double get longitudeError => _parseDouble(_field(6), fallback: 0.0);
double get latitudeError => _parseDouble(_field(7), fallback: 0.0);
double get heightError => _parseDouble(_field(8), fallback: 0.0);
String _field(int index) {
if (index < 0 || index >= fields.length) return '';
return fields[index].trim();
}
double _parseDouble(String value, {required double fallback}) {
return double.tryParse(value) ?? fallback;
}
} }

81
lib/gnss_sentences/gnrmc.dart
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@ -1,38 +1,71 @@
import 'package:nmea/nmea.dart'; import 'package:nmea/nmea.dart';
class Gnrmc extends TalkerSentence { class Gnrmc extends TalkerSentence {
static const String id = "GNRMC"; static const String id = 'GxRMC';
Gnrmc({required super.raw}); Gnrmc({required super.raw});
@override @override
bool get valid => super.valid && fields.length == 14; bool get valid => super.valid && fields.length >= 10;
String get messageId => fields[0]; String get messageId => _field(0);
String get utcOfPositionFix => fields[1];
String get Status => fields[2];
double get latitude => _getCoordinateFromGpsLatitude(fields[3]);
String get latitudeDirection => fields[4];
double get longitude => _getCoordinateFromGpsLongitude(fields[5]);
String get longitudeDirection => fields[6];
double get speedOverGroundKnots => double.parse(fields[7]);
double get courseOverGround => double.parse(fields[8]);
String get date => fields[9];
double get magneticVariation => double.parse(fields[10]);
String get magneticVariationDirection => fields[11];
String get positioningSystemModeIndicator => fields[12];
double _getCoordinateFromGpsLongitude(String coordinate) { String get utcOfPositionFix => _field(1);
double result =
double.parse("${coordinate[0]}${coordinate[1]}${coordinate[2]}") +
double.parse(coordinate.substring(3)) / 60;
return result; String get status => _field(2).toUpperCase();
String get latitudeDirection => _field(4).toUpperCase();
double get latitude => _parseLatitude(_field(3), latitudeDirection) ?? 0.0;
String get longitudeDirection => _field(6).toUpperCase();
double get longitude => _parseLongitude(_field(5), longitudeDirection) ?? 0.0;
double get speedOverGroundKnots => _parseDouble(_field(7), fallback: 0.0);
double get courseOverGround => _parseDouble(_field(8), fallback: 0.0);
String get date => _field(9);
// Opcionális mezők -> nullable getterek
double? get magneticVariation => _parseDoubleOrNull(_field(10));
String get magneticVariationDirection => _field(11).toUpperCase();
String get positioningSystemModeIndicator => _field(12).toUpperCase();
String _field(int index) {
if (index < 0 || index >= fields.length) return '';
return fields[index].trim();
} }
double _getCoordinateFromGpsLatitude(String coordinate) { double _parseDouble(String value, {required double fallback}) {
double result = double.parse("${coordinate[0]}${coordinate[1]}") + return double.tryParse(value) ?? fallback;
double.parse(coordinate.substring(2)) / 60; }
return result; double? _parseDoubleOrNull(String value) {
if (value.isEmpty) return null;
return double.tryParse(value);
}
double? _parseLatitude(String value, String direction) {
if (value.length < 4) return null; // ddmm.mmmm
final deg = double.tryParse(value.substring(0, 2));
final min = double.tryParse(value.substring(2));
if (deg == null || min == null) return null;
final result = deg + (min / 60.0);
return direction == 'S' ? -result : result;
}
double? _parseLongitude(String value, String direction) {
if (value.length < 5) return null; // dddmm.mmmm
final deg = double.tryParse(value.substring(0, 3));
final min = double.tryParse(value.substring(3));
if (deg == null || min == null) return null;
final result = deg + (min / 60.0);
return direction == 'W' ? -result : result;
} }
} }