基于51单片机实现的GPS数据接收及液晶显示代码

Glenn Baddeley - GPS - NMEA sentence information All $GPxxx sentence codes and short descriptions ¡¤ $GPAAM - Waypoint Arrival Alarm ¡¤ $GPALM - GPS Almanac Data ¡¤ $GPAPA - Autopilot format "A" ¡¤ $GPAPB - Autopilot format "B" ¡¤ $GPASD - Autopilot System Data ¡¤ $GPBEC - Bearing & Distance to Waypoint, Dead Reckoning ¡¤ $GPBOD - Bearing, Origin to Destination ¡¤ $GPBWC - Bearing & Distance to Waypoint, Great Circle ¡¤ $GPBWR - Bearing & Distance to Waypoint, Rhumb Line ¡¤ $GPBWW - Bearing, Waypoint to Waypoint ¡¤ $GPDBT - Depth Below Transducer ¡¤ $GPDCN - Decca Position ¡¤ $GPDPT - Depth ¡¤ $GPFSI - Frequency Set Information ¡¤ $GPGGA - Global Positioning System Fix Data ¡¤ $GPGLC - Geographic Position, Loran-C ¡¤ $GPGLL - Geographic Position, Latitude/Longitude ¡¤ $GPGRS - GPS Range Residuals ¡¤ $GPGSA - GPS DOP and Active Satellites ¡¤ $GPGST - GPS Pseudorange Noise Statistics ¡¤ $GPGSV - GPS Satellites in View ¡¤ $GPGXA - TRANSIT Position ¡¤ $GPHDG - Heading, Deviation & Variation ¡¤ $GPHDT - Heading, True ¡¤ $GPHSC - Heading Steering Command ¡¤ $GPLCD - Loran-C Signal Data ¡¤ $GPMSK - Control for a Beacon Receiver ¡¤ $GPMSS - Beacon Receiver Status ¡¤ $GPMTA - Air Temperature (to be phased out) ¡¤ $GPMTW - Water Temperature ¡¤ $GPMWD - Wind Direction ¡¤ $GPMWV - Wind Speed and Angle ¡¤ $GPOLN - Omega Lane Numbers ¡¤ $GPOSD - Own Ship Data ¡¤ $GPR00 - Waypoint active route (not standard) ¡¤ $GPRMA - Recommended Minimum Specific Loran-C Data ¡¤ $GPRMB - Recommended Minimum Navigation Information ¡¤ $GPRMC - Recommended Minimum Specific GPS/TRANSIT Data ¡¤ $GPROT - Rate of Turn ¡¤ $GPRPM - Revolutions ¡¤ $GPRSA - Rudder Sensor Angle ¡¤ $GPRSD - RADAR System Data ¡¤ $GPRTE - Routes ¡¤ $GPSFI - Scanning Frequency Information ¡¤ $GPSTN - Multiple Data ID ¡¤ $GPTRF - Transit Fix Data ¡¤ $GPTTM - Tracked Target Message ¡¤ $GPVBW - Dual Ground/Water Speed ¡¤ $GPVDR - Set and Drift ¡¤ $GPVHW - Water Speed and Heading ¡¤ $GPVLW - Distance Traveled through the Water ¡¤ $GPVPW - Speed, Measured Parallel to Wind ¡¤ $GPVTG - Track Made Good and Ground Speed ¡¤ $GPWCV - Waypoint Closure Velocity ¡¤ $GPWNC - Distance, Waypoint to Waypoint ¡¤ $GPWPL - Waypoint Location ¡¤ $GPXDR - Transducer Measurements ¡¤ $GPXTE - Cross-Track Error, Measured ¡¤ $GPXTR - Cross-Track Error, Dead Reckoning ¡¤ $GPZDA - UTC Date / Time and Local Time Zone Offset ¡¤ $GPZFO - UTC & Time from Origin Waypoint ¡¤ $GPZTG - UTC & Time to Destination Waypoint 26 interpreted sentences transmitted by GPS unit $GPAAM - Waypoint Arrival Alarm $GPALM - GPS Almanac Data (Can also be received by GPS unit) $GPAPB - Autopilot format "B" $GPBOD - Bearing, origin to destination $GPBWC - Bearing and distance to waypoint, great circle $GPGGA - Global Positioning System Fix Data $GPGLL - Geographic position, latitude / longitude $GPGRS - GPS Range Residuals $GPGSA - GPS DOP and active satellites $GPGST - GPS Pseudorange Noise Statistics $GPGSV - GPS Satellites in view $GPHDT - Heading, True $GPMSK - Control for a Beacon Receiver $GPMSS - Beacon Receiver Status $GPR00 - List of waypoints in currently active route $GPRMA - Recommended minimum specific Loran-C data $GPRMB - Recommended minimum navigation info $GPRMC - Recommended minimum specific GPS/Transit data $GPRTE - Routes $GPTRF - Transit Fix Data $GPSTN - Multiple Data ID $GPVBW - Dual Ground / Water Speed $GPVTG - Track made good and ground speed $GPWPL - Waypoint location $GPXTE - Cross-track error, Measured $GPZDA - UTC Date / Time and Local Time Zone Offset There is a full list of $GPxxx sentence codes available, without links to format details. $GPAAM Waypoint Arrival Alarm This sentence is generated by some units to indicate the Status of arrival (entering the arrival circle, or passing the perpendicular of the course line) at the destination waypoint. $GPAAM,A,A,0.10,N,WPTNME*43 Where: AAM Arrival Alarm A Arrival circle entered A Perpendicular passed 0.10 Circle radius N Nautical miles WPTNME Waypoint name *43 Checksum data -------------------------------------------------------------------------------- $GPALM GPS Almanac Data A set of sentences transmitted by some Garmin units in response to a received $PGRMO,GPALM,1 sentence. It can also be received by some GPS units (eg. Garmin GPS 16 and GPS 17) to initialize the stored almanac information in the unit. Example 1: $GPALM,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,*CC 1 = Total number of sentences in set 2 = Sentence sequence number in set 3 = Satellite number 4 = GPS week number 5 = Bits 17 to 24 of almanac page indicating SV health 6 = Eccentricity 7 = Reference time of almanac 8 = Inclination angle 9 = Right ascension rate 10 = Semi major axis route 11 = Argument of perigee (omega) 12 = Ascension node longitude 13 = Mean anomaly 14 = af0 clock parameter 15 = af1 clock parameter Example 2: $GPALM,1,1,15,1159,00,441d,4e,16be,fd5e,a10c9f,4a2da4,686e81,58cbe1,0a4,001*5B Field Example Comments Sentence ID $GPALM Number of messages 1 Total number of messages in sequence Sequence number 1 This is first message in sequence Satellite PRN 15 Unique ID (PRN) of satellite message relates to GPS week number 1159 SV health 00 Bits 17-24 of almanac page Eccentricity 441d Reference time 4e Almanac reference time Inclination angle 16be Rate of right ascension fd5e Roor of semi-major axis a10c9f Argument of perigee 4a2da4 Longitude of ascension node 686e81 Mean anomoly 58cbe1 F0 clock parameter 0a4 F1 clock parameter 001 Checksum *5B -------------------------------------------------------------------------------- $GPAPB Autopilot format "B" This sentence is sent by some GPS receivers to allow them to be used to control an autopilot unit. This sentence is commonly used by autopilots and contains navigation receiver warning flag status, cross-track-error, waypoint arrival status, initial bearing from origin waypoint to the destination, continuous bearing from present position to destination and recommended heading-to-steer to destination waypoint for the active navigation leg of the journey. Note: Some autopilots, Robertson in particular, misinterpret "bearing from origin to destination" as "bearing from present position to destination". This is likely due to the difference between the APB sentence and the APA sentence. for the APA sentence t