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sdk:gps-udp-client-gnsstogps [2019/11/28 11:15] fachet |
sdk:gps-udp-client-gnsstogps [2019/11/28 11:26] fachet |
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| ====== Background ====== | ====== Background ====== | ||
| - | GPS was the first Global Navigation Satellite System (GNSS) and the termt GPS is often used as a synonym for GNSS. | + | GPS was the first Global Navigation Satellite System (GNSS) and the term GPS is often used as a synonym for GNSS. |
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| + | Older software often only checks for NMEA 0183 sentences starting with <nowiki>"$GP"</nowiki> (= GPS only) instead of looking for all GNSS systems. | ||
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| + | Newer GNSS receivers often use multiple GNSS systems and therefore <nowiki>"$GN"</nowiki> is used (<nowiki>"$GNRMC..."</nowiki>) if it recives a combination of GPS, Galileo and GLONASS signals. | ||
| - | Because of this older software only check for NMEA 0183 sentences starting with <nowiki>"$GP"</nowiki> (= GPS only) instead of looking for the different GNSS systems (e.g. <nowiki>"$GPRMC..."</nowiki>). | ||
| - | Unfortunately with newer GNSS receiver often multiple GNSS systems are used and therefore <nowiki>"$GN"</nowiki> is used (<nowiki>"$GNRMC..."</nowiki>). | ||
| It would be better to us instead of <nowiki>"$GPRMC"</nowiki> either <nowiki>"$G.RMC"</nowiki> ("." = anychar) for using GPS, Galileo and/or GLONASS (GNSS) or even <nowiki>"$..RMC"</nowiki> which means any source. | It would be better to us instead of <nowiki>"$GPRMC"</nowiki> either <nowiki>"$G.RMC"</nowiki> ("." = anychar) for using GPS, Galileo and/or GLONASS (GNSS) or even <nowiki>"$..RMC"</nowiki> which means any source. | ||
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| GL = GLONASS | GL = GLONASS | ||
| GP = GPS | GP = GPS | ||
| - | GN = GNSS(multiple sources e.g. GPS "GP", Galileo "GA" and Glonass "GL") | + | GN = GNSS position fix from more than one constellation (eg. GPS + GLONASS) |
| "YYY" = Record | "YYY" = Record | ||
| RMC = Recommended Minimum Sentence C (used in most cases) | RMC = Recommended Minimum Sentence C (used in most cases) | ||
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| GLL = Geographic Position - Latitude/Longitude | GLL = Geographic Position - Latitude/Longitude | ||
| ... | ... | ||
| + | |||
| + | Source: https://de.wikipedia.org/wiki/NMEA_0183 | ||
| </code> | </code> | ||