GPS Data Format

GPS Data Format

GPRS (the minimum GPS data format is recommended)

$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11><CR><LF> 

1) standard positioning Time (UTC time) Format: time, minute, second (hhmmss. Sss ).

2) Positioning status, A = data available, V = data unavailable.

3) latitude, in the format of ddmm. Mmmm ).

4) latitude differentiation: Northern Hemisphere (n) or Southern Hemisphere (s ).

5) longitude, in the format of "degree score. Score.

6) The longitude is distinguished, East (e) hemisphere or West (w) hemisphere.

7) relative displacement speed: 0.0 to 1851.8 knots

8) relative displacement direction: 000.0 to 359.9 degrees. The actual value.

9) date, in the format of ddmmyy ).

10) magnetic pole variable, ranging from 000.0 to 180.0.

11) degree.

12) checksum. (checkbit)

Gpgsv (satellite format shown)

$GPGSV, <1>,<2>,<3>,<4>,<5>,<6>,<7>,⋯<4>,<5>,<6>,<7>,<8><CR><LF> 

1) the total number of satellites that receive signals in the sky.

2) Total number of satellites to be located.

3) The total number of satellites in the sky, ranging from 00 to 12.

4) Satellite Number, ranging from 01 to 32.

5) satellite elevation, from Oo to 90 degrees.

6) satellite azimuth, OOO to 359 degrees. The actual value.

7) signal noise ratio (C/no), 00 to 99 dB; no table does not receive the signal.

8) checksum. (check bit ).

<4>, <5>, <6>, <7> some satellites are repeated. Each row has a maximum of four satellites. Other satellite information will appear in the next row. if not used, these fields will be blank.

Gpgsa (GPS precision pointer and satellite format)

$GPGSA,<1>,<2>,<3>,<3>,,,,,<3>,<3>,<3>,<4>,<5>,<6>,<7><CR><LF> 

1) Mode 2: M = manual, a = automatic.

2) Mode 1: positioning type 1 = undetermined, 2 = 2D positioning, 3 = 3D positioning.

3) PRN numbers: numbers used by satellites from Table 01 to Table 32 in the sky. Up to 12 satellites can be received.

4) pdop-Position Precision dilution: 0.5 to 99.9.

5) hdop-horizontal precision dilution: 0.5 to 99.9.

6) vdop-vertical precision dilution 0.5 to 99.9.

7) checksum. (check bit ).

GPS fixed data output Statement ($ gpgga)

This is the main data of GPS Positioning and the most widely used data. For ease of understanding, the following example describes the meaning of each part of the $ gpgga statement. Example 1 is the $ gpgga statement received at the location of the author with the GN-77N and the software and hardware interface developed by the author.

Example 1: $ gpgga, 050901,393 1.4449, N, 11643.5123, E, 1.4, 76.2, 7.0, M,-, M, * 65

Standard Format: $ gpgga, (1), (2), (3), (4), (5), (6), (7), (8 ), (9), M, (10), M, (11), (12) * hh (CR) (LF)

The meanings of each part are as follows:

(1) UTC time: 05: 09: 01 seconds

(2) latitude (Format: ddmm. Mmmm: DD, mm. Mmmm );

(3) N/S (latitude north or latitude south): Latitude 39 degrees 31.4449 points;

(4) longitude (Format: dddmm. Mmmm: DDD, mm. Mmmm );

(5) E/W (eastern longitude or Western longitude): The eastern longitude is 116 degrees and 43.5123 points;

(6) Quality Factor (0 = No positioning, 1 = real-time GPS, 2 = Differential GPS): 1 = real-time GPS;

(7) number of available satellites (0 ~ 8): the number of available satellites = 07;

(8) Horizontal precision factor (1.0 ~ 99.9); horizontal precision factor = 1.4;

(9) antenna elevation (sea level,-9999.9 ~ 99999.9, unit: m); antenna elevation = 76.2 m );

(10) height of the earth's elliptical sphere relative to sea level (-999.9 ~ 9999.9, unit: m):-7.0 m;

(11) Differential GPS data age, no real-time GPS: none;

(12) Differential reference station number (0000 ~ 1023), no real-time GPS: none;

* Sum verification domain;

Total HH verification count: 65

(CR) (LF) Press enter, line feed.

B. Output statement of the visible satellite status ($ gpgsv)

Example 2: $ gpgsv, 33,240, 36,074, 21,078, 36,313, 42*78

Standard Format: $ gpgsv, (1), (2), (3), (4), (5), (6), (7 ),... (4), (5), (6), (7) * hh (CR) (LF)

Each part has the following meanings:

(1) Total number of GSV statement messages; 2;

(2) Current GSV statement number: 1;

(3) Total number of visible satellites: 08;

(4) satellite No.: 06;

(5) elevation (00 ~ 90 degrees): 33 degrees;

(6) azimuth (000 ~ 359 degrees): 240 degrees;

(7) signal-to-noise ratio (00 ~ 99db): 45db (the information of satellites 10, 16, and 17 are followed in sequence );

* Sum verification domain;

Total HH verification count: 78;

(CR) (LF) Press enter, line feed.

Note: Each statement can contain up to four satellites. Each satellite has four data items, namely:

(4)-Satellite Number, (5)-elevation angle, (6)-azimuth, (7)-signal-to-noise ratio.