GPS fixed data output statement ($ GPGGA) This is the main data of a frame GPS positioning, but also the most widely used data. For ease of understanding, the meaning of each part of the $ GPGGA statement will be explained below. Example 1 is the content of the $ GPGGA statement that is received by the IP in the hardware interface developed by GN-77N and the author. Examples 1: $ GPGGA, 050901, 3931.4449, N, 11643.5123, E, 1, 07, 1.4, 76.2, M, -7.0, M,, * 65 The standard format is: $ GPGGA, (1), (2), (3), (4), (5), (6), (7), (8), (9), m, (10), m, (11), (12) * HH (CR) (LF The meaning of each part is: (1) positioning UTC time: 09 minutes 01 seconds (2) latitude (format DDMM mmmmm: ie DD degree, mm.mmmmm); (3) n / s (north latitude Or south latitude): 39 degrees from the north latitude 31.4449 points; (4) longitude (format DDDMM.Mmmmmmmmmmmmmmmmmmm); (5) E / W (East or West): East is 116 degrees 43.5123 points; (6) Quality factor (0 = no positioning, 1 = real-time GPS, 2 = differential GPS): 1 = Real-time GPS; (7) Satellite number (0 ~ 8): Satellite number = 07; 8) Level accuracy factor (1.0 ~ 99.9); horizontal precision factor = 1.4; (9) antenna elevation (sea plane, -9999.9 ~ 99999.9: m); antenna elevation = 76.2m); (10) Elliptic surface The height of the sea level (-999.9 ~ 9999.9, unit: m): - 7.0m; (11) Differential GPS data age, real-time GPS None: None; (12) Differential reference station number (0000 ~ 1023), real-time GPS None: None; * Summer and check domain; HH sum check: 65 (CR) (LF) Enter, wrap.
