GPS Data Format

This cainiao: Professional navigation, good at finding the north, proficient in inertial guidance, and part-time GPS. However, due to the needs of the subject recently, the vision of machines is also a sigh of impermanence! I don't want to talk about it today. I can say that I had been filming for 6 days and 7 nights ). Today's topic is GPS. GPS navigation is commonly known as shit-style navigation (it's so cool. How did laomei come up with such a name, God forgive me !).

Start:
Recently I bought a GPS receiver and ran it. I don't know when to use the local Beidou.

Day 1: The city is overcast and drizzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz! My God, Google, however, requires a baud rate of 4800. After the change, the response is normal. The screenshot is as follows:

Gpgga, 031531.391, 0.0, M, 0000, M, * 58
$ Gpgsa, A, 1, * 1e // <m = manual, a = automatic>, <1 = undetermined, 2 = 2D positioning, 3 = 3D positioning>
$ Gprs mc, 031531.391, V, 030911, N * 49
// <UTC time>, <A = valid location, V = Invalid location> (since the location is invalid, you do not need to read it later)
$ Gpgga, 031532.403, 0.0, M, 0000, M, * 57
$ Gpgsa, A, 1, * 1e
$ Gprs mc, 031532.403, V, 030911, N * 46
$ Gpgga, 031533.392, 0.0, M, 0000, M, * 59
$ Gpgsa, A, 1, * 1e
$ Gprs mc, 031533.392, V, 030911, N * 48
$ Gpgga, 031534.392, 0.0, M, 0000, M, * 5E // a long frame is sent every several frames, including the satellite status
$ Gpgsa, A, 1, * 1e
$ Gpgsv, 84,328, 236, * 7f
// <3 indicates three sub-frames>, <1 Table's first sub-frame>, and <12 table's number of visible satellites>
// Indicates the situation of four groups of satellites (, 03, and 13) starting from the fourth
// <Table 25 satellite number>, <84 pitch angle>, <328 azimuth angle>, <signal-to-noise ratio (no signal in the empty region table)>
$ Gpgsv, 45,231, 207, 125, * 71
$ Gpgsv, 15,179, 309, * 70
$ Gprs mc, 031534.392, V, 030911, N * 4f

Conclusion The positioning fails due to the weather.

The next day: tianqing cloud light

$ Gpgga, 012013.000, 3800.5678, N, 11400.1234, E, 1.6, 113.3, 15.0, M,-0000, M, * 7b
$ Gpgsa, A, 2.5, 1.6, 1.9, * 31
// The 3D positioning is successful. The satellite receiving the signal is, 31.
$ Gprs mc, 012013.000, A, 3800.5678, N, 11400.1234, E, 0.12, 349.87, 040911, A * 6f
$ Gpgga, 012014.000, 3800.5678, N, 11400.1234, E, 1.6, 113.2, 15.0, M,-0000, M, * 7E
$ Gpgsa, A, 2.5, 1.6, 1.9, * 31
$ Gpgsv, 71,190, * 78
$ Gpgsv, 46,303, 305, * 78
$ Gpgsv, 23,317, * 73
$ Uplmc, 012014.000, A, 3800.5678, N, 11400.1234, E, 0.13, 343.31, 040911, A * 6d

Positioning successful, dimension: 3800.5678 (N), longitude: 11400.1234 (E)