45 lines
1.2 KiB
JavaScript
45 lines
1.2 KiB
JavaScript
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/*
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=== GSA - GPS DOP and active satellites ===
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This is one of the sentences commonly emitted by GPS units.
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------------------------------------------------------------------------------
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1 2 3 4 14 15 16 17 18
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$--GSA,a,a,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x.x,x.x,x.x*hh
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------------------------------------------------------------------------------
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Field Number:
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1) Selection mode
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2) Mode
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3) ID of 1st satellite used for fix
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4) ID of 2nd satellite used for fix
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...
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14) ID of 12th satellite used for fix
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15) PDOP in meters
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16) HDOP in meters
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17) VDOP in meters
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18) Checksum
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*/
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exports.TYPE = 'active-satellites';
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exports.ID = 'GSA';
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exports.decode = function(fields) {
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// $GPGSA,A,3,12,05,25,29,,,,,,,,,9.4,7.6,5.6
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var sats = [];
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for (var i=1; i < 13; i++) {
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if (fields[i+2]) sats.push(+fields[i+2]);
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};
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return {
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sentence: exports.ID,
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type: exports.TYPE,
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selectionMode: fields[1],
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mode: +fields[2],
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satellites: sats,
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PDOP: +fields[15],
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HDOP: +fields[16],
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VDOP: +fields[17],
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systemId: +fields[18]
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};
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}
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