The signal-to-noise ratio graph has three colors, namely green, blue, and red
Green means that it has participated in positioning.
Blue means that the satellite signal is available but not used for positioning.
Red means that the acquired satellite information cannot be used for positioning.
The GPS signal-to-noise ratio reflects the strength of the GPS received signal and determines the positioning performance of the product.
$ GPGSV, 2,1,05,07,28,324,32,08,79,302,35,23,30,27,51,028,42 48.
$ GPGSV, 2,2,05,28,28 7C.
Expressed as: $GPGSV, (1), (2), (3), (4), (5), (6), (7), ... (4), (5), (6), (7) *hh(CR)(LF)
(1) Total number of GSV sentences
(2) Current GSV sentence number
(3) Total number of visible satellites
(4) Satellite number
(5) Elevation angle (00～90 degrees)
(6) Azimuth angle (000～359 degrees)
(7 ) ) Signal-to-noise ratio (00～99dB)
Each visible satellite contains: number, elevation angle, azimuth angle, and signal-to-noise ratio, and each sentence contains up to 4 satellite data.