NEMA 自動天線追蹤器

國家海洋環境局 (美國國家海洋電子協會) 是GPS使用的標準通訊協議 (Global Positioning System) devices to transmit location data. The most common format is 國家海洋環境局 0183, which defines a set of sentences that GPS receivers output via serial communication.

我們的 自動天線追蹤器 supports NEMA data.

Common NMEA Sentences

Each NMEA sentence starts with “$”, followed by a comma-separated list of values.

1. $GPGGA – Global Positioning System Fix Data
   • 例子:mathematica
     • $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
   • Key fields:
     • 123519 – UTC time (12:35:19)
     • 4807.038,N – Latitude (48°07.038′ N)
     • 01131.000,乙 – Longitude (11°31.000′ 乙)
     • 1 – Fix quality (1 = GPS fix, 0 = No fix)
     • 08 – Number of satellites in use
     • 545.4,中號 – Altitude (545.4 米)
2. $GPRMC – Recommended Minimum Navigation Information
   • 例子:mathematica
     • $GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
   • Key fields:
     • 一個 – Status (A = Valid, V = Invalid)
     • 022.4 – Speed (in knots)
     • 084.4 – Course over ground (degrees)
     • 230394 – Date (23rd March 1994)
3. $GPVTG – Course Over Ground and Speed
   • 例子:mathematica
     • $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48
   • Key fields:
     • 054.7,時間 – Course over ground (true north)
     • 005.5,N – Speed (in knots)
     • 010.2,K – Speed (in km/h)

NMEA Protocol Versions

• 國家海洋環境局 0183: A widely used serial communication standard for GPS, AIS (Automatic Identification System), and other marine electronics.
• 國家海洋環境局 2000: A more advanced version based on the CAN bus, supporting more complex marine electronic systems.