@signalk/nmea0183-signalk
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A node.js/javascript parser for NMEA0183 sentences. Sentences are parsed to Signal K format.
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JavaScript
;
/**
* Copyright 2021 Signal K and Contributors>.
*
* Licensed under the Apache License, Version 2.0 (the 'License');
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an 'AS IS' BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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Object.defineProperty(exports, "__esModule", { value: true });
const utils = __importStar(require("@signalk/nmea0183-utilities"));
const debug_1 = __importDefault(require("debug"));
const debug = (0, debug_1.default)('signalk-parser-nmea0183/GSV');
/** NMEA0183 GSV
$GPGSV,3,1,09,07,16,321,37,08,29,281,33,10,29,143,35,16,75,216,35,0*6E
$GPGSV,3,2,09,18,38,057,35,20,44,105,40,21,81,117,33,26,43,164,25,0*63
$GPGSV,3,3,09,27,62,289,41,0*5B
$GLGSV,3,1,10,65,14,112,18,71,15,018,11,72,25,069,31,77,10,181,30,0*79
$GLGSV,3,2,10,78,52,221,38,79,44,310,28,80,00,342,,81,35,261,40,0*7E
$GLGSV,3,3,10,87,41,052,31,88,75,350,33,0*73
$GAGSV,2,1,07,01,37,308,33,03,09,074,35,05,07,025,,13,85,237,31,0*7F
$GAGSV,2,2,07,15,39,060,33,21,63,228,39,26,30,239,40,0*44
GSV - GNSS Satellites In View
**
0 1 2 3 4 5 6 n
| | | | | | | |
$--GSV,x,x,x,x,x,x,x.........*hh<CR><LF>
**
Field Number:
0) Number of sentences for full data
1) sentence number
2) Number of satellites in view
3) Satellite PRN number
4) Elevation, degrees
5) Azimuth, degrees
6) SNR - higher is better
7) Satellite PRN number
8) Elevation, degrees
9) Azimuth, degrees
10) SNR - higher is better
11) Satellite PRN number
12) Elevation, degrees
13) Azimuth, degrees
14) SNR - higher is better
15) Satellite PRN number
16) Elevation, degrees
17) Azimuth, degrees
18) SNR - higher is better
n) Checksum
note: NMEA 0183 4.11 has an , not used, extra field 19.
*/
const NUMBER_OF_SENTENCES = 0;
const SENTENCE_NUMBER = 1;
const SATS_IN_VIEW = 2;
const SAT_DATA_BLOCK_START = 3;
const SAT_DATA_LENGTH = 4;
const OFFSET_ELEVATION = 1;
const OFFSET_AZIMUTH = 2;
const OFFSET_SNR = 3;
const TALKER_TO_GNSS = {
GP: 'GPS',
GL: 'GLONASS',
GA: 'GALILEO',
GB: 'BEIDOU',
GQ: 'QZSS'
};
const GSV = function (input, session) {
const { id, parts, tags, talker } = input;
let gsvData = session['gsvData'];
if (!gsvData) {
gsvData = {
nextSentenceNumber: 1,
numberOfSentences: Number(parts[NUMBER_OF_SENTENCES]),
count: Number(parts[SATS_IN_VIEW]),
satellites: [],
gnss: TALKER_TO_GNSS[talker]
};
session['gsvData'] = gsvData;
}
if (Number(parts[SENTENCE_NUMBER]) !== gsvData.nextSentenceNumber) {
debug(`Expected sentence number to be ${gsvData.nextSentenceNumber} but got ${parts}`);
delete session['gsvData'];
return null;
}
gsvData.nextSentenceNumber = (gsvData.nextSentenceNumber ?? 0) + 1;
for (let i = 0; i < 4; i++) {
const thisSatDataStart = SAT_DATA_BLOCK_START + i * SAT_DATA_LENGTH;
const _satPRN = parts[thisSatDataStart];
if (_satPRN !== undefined && !isNaN(Number(_satPRN))) {
const satPRN = Number(_satPRN);
gsvData.satellites.push({
id: satPRN >= 64 ? satPRN - 64 : satPRN,
elevation: utils.transform(parts[thisSatDataStart + OFFSET_ELEVATION] ?? '0', 'deg', 'rad'),
azimuth: utils.transform(parts[thisSatDataStart + OFFSET_AZIMUTH] ?? '0', 'deg', 'rad'),
SNR: Number(parts[thisSatDataStart + OFFSET_SNR])
});
}
}
if (Number(parts[SENTENCE_NUMBER]) === gsvData.numberOfSentences) {
delete session['gsvData'];
delete gsvData.nextSentenceNumber;
delete gsvData.numberOfSentences;
gsvData.satellites = gsvData.satellites.slice(0, gsvData.count);
let source = tags.source;
if (id === 'GSVH') {
// Unicore UM98x slave antenna
gsvData.antennaType = 'SLAVE';
//no source from tag, append H to create separate source from regular talker
if (source === ':') {
source = `${talker}-H`;
}
}
return {
updates: [
{
source,
timestamp: tags.timestamp,
values: [
{
path: 'navigation.gnss.satellitesInView',
value: gsvData
}
]
}
]
};
}
return null;
};
exports.default = GSV;
//# sourceMappingURL=GSV.js.map