b0a1993169
NMEA-0183 语句解析器，含 21 个语句类型 codec 与配套单元测试。 - codecs/：APB/BWC/DBT/GGA/GLL/GRMT/GSA/GSV/HDG/HDM/HDT/MWV/RDID/ RMB/RMC/ROT/RSA/TXT/VTG/VWR/ZDA - test/：各 codec 对应的 mocha 用例 - .github/workflows/：node与 npm-publish 流水线 许可证：MIT（原作者 James Penn）
70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
var helpers = require("../helpers.js")
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/*
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=== VTG - Track made good and Ground speed ===
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------------------------------------------------------------------------------
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1 2 3 4 5 6 7 8 9 10
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$--VTG,x.x,T,x.x,M,x.x,N,x.x,K,m,*hh<CR><LF>
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------------------------------------------------------------------------------
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Field Number:
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1. Track Degrees
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2. T = True
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3. Track Degrees
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4. M = Magnetic
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5. Speed Knots
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6. N = Knots
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7. Speed Kilometers Per Hour
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8. K = Kilometers Per Hour
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9. FAA mode indicator (NMEA 2.3 and later)
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10. Checksum=== VTG - Track made good and Ground speed ===
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------------------------------------------------------------------------------
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1 2 3 4 5 6 7 8 9 10
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$--VTG,x.x,T,x.x,M,x.x,N,x.x,K,m,*hh<CR><LF>
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------------------------------------------------------------------------------
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Field Number:
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1. Track Degrees
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2. T = True
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3. Track Degrees
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4. M = Magnetic
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5. Speed Knots
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6. N = Knots
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7. Speed Kilometers Per Hour
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8. K = Kilometers Per Hour
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9. FAA mode indicator (NMEA 2.3 and later)
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10. Checksum
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*/
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exports.TYPE = 'track-info';
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exports.ID = 'VTG';
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exports.decode = function (fields) {
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return {
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sentence: exports.ID,
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type: 'track-info',
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trackTrue: +fields[1],
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trackMagnetic: +fields[3],
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speedKnots: +fields[5],
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speedKmph: +fields[7]
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}
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};
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exports.encode = function (talker, msg) {
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var result = ['$' + talker + exports.ID];
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result.push(helpers.encodeDegrees(msg.trackTrue));
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result.push('T');
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result.push(helpers.encodeDegrees(msg.trackMagnetic));
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result.push('M');
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result.push(helpers.encodeFixed(msg.speedKnots, 2));
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result.push('N');
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result.push('');
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result.push('');
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result.push('A');
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var resultMsg = result.join(',');
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return resultMsg + helpers.computeChecksum(resultMsg);
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} |