{"id":453,"date":"2010-09-30T15:17:16","date_gmt":"2010-09-30T15:17:16","guid":{"rendered":"http:\/\/ravtrack.com\/GPStracking\/?p=453"},"modified":"2012-04-17T16:39:09","modified_gmt":"2012-04-17T16:39:09","slug":"gps-receiver-dynamics","status":"publish","type":"post","link":"https:\/\/ravtrack.com\/GPStracking\/gps-receiver-dynamics\/","title":{"rendered":"GPS Receiver Dynamics"},"content":{"rendered":"

The GPS receiver in Raveon’s M7<\/em> and Atlas PL<\/em> GPS transponder may be configured\u00a0for different situations.\u00a0By default it is configured for LAND operation.
\nSelecting the correct operating parameters has a significant impact on GPS receiver performance.\u00a0 GPS receiver dynamics may be optimized for LAND, AIR, or SEA operation.
\n\u00a0\u00a0
\n\u00a0 LAND\u00a0 = 1\u00a0\u00a0\u00a0 Maximum speed the GPS will receive at is 233knots\/268mph\/430kmh.\u00a0 Useful altitude from -2000 to +9000 meters.
\n\u00a0 SEA = 2\u00a0\u00a0\u00a0 Maximum speed the GPS will receive is not specified.\u00a0 Useful altitude from -2000 to +9000 meters.
\n\u00a0 AIR = 3\u00a0\u00a0 Maximum speed the GPS will receive at is 1000knots\/1150mph\/1800kmh.\u00a0 Useful altitude from -2000 to +50,000 meters.
\n\u00a0
\nThe default setting for the GPS receiver used in Raveon’s M7<\/em> series of GPS transponders and Atlas PL<\/em> Transponders is LAND.
\nThe default LAND operating parameters allow the receiver to perform well in most environments. Transponders with firmware version C12 or higher are able to view the GPS receiver’s configured dynamics, and change the dynamic mode between AIR, LAND, and SEA.\u00a0Upon power up, the firmware reads the internal GPS receiver’s current configuration.<\/p>\n

The user can optimize the internal GPS receiver in the transponder to a particular application.\u00a0 If the receiver is then taken out of this environment, the specifically tuned receiver may not operate as well as a receiver with the default options.
\nThe dynamics feature default setting is LAND mode, where the receiver assumes a moderate dynamic environment. In this case, the satellite search and re-acquisition routines are optimized for vehicle type environments. In SEA mode, the search and re-acquisition routines assume a low acceleration environment. In AIR mode, the search and reacquisition routines are optimized for high acceleration conditions.\u00a0<\/p>\n

Reading the GPS Receiver Configuration<\/h2>\n

The GPS receiver configuration may be determined by using the GX command to show the overall configuration of the M7<\/em> or Atlas PL<\/em> transponder. The “Dynamics” command will also return a string in the following format that indicates how the GPS receiver in the transponder is currently configured.\u00a0\u00a0\u00a0<\/p>\n

MMM, EE.E, SS.S<\/p>\n

\u00a0MMM: dynamic mode AIR, LAND, or SEA
\n\u00a0EE.E: Elevation Mask
\n\u00a0SS.S: Signal Mask\u00a0\u00a0<\/p>\n

Elevation Mask<\/h2>\n

This is the minimum elevation angle for satellites to be used in a solution output by the receiver. Satellites which are near the horizon are typically more difficult to track due to signal attenuation, and are also generally less accurate due to higher variability in the ionospheric and tropospheric corruption of the signal. When there are no obstructions, the receiver can generally track a satellite down to near the horizon.\u00a0<\/p>\n

Signal Mask<\/h2>\n

This mask defines the minimum signal strength for a satellite used in a solution. There is some internal hysteresis on this threshold which allows brief excursions below the threshold if lock is maintained and the signal was previously above the mask.<\/p>\n

Configuring the Dynamics<\/h2>\n

Use the DYNAMICS command to set or read the dynamics.\u00a0 DYNAMICS with no parameter will return the configuration.\u00a0 The following commands may be used to set the dynamics:<\/p>\n

DYNAMICS 0\u00a0\u00a0\u00a0 (factory default dynamic mode)
\nDYNAMICS\u00a01\u00a0\u00a0\u00a0 (LAND)
\nDYNAMICS\u00a02\u00a0\u00a0\u00a0 (SEA)
\nDYNAMICS\u00a03 \u00a0\u00a0 (AIR)<\/p>\n

When issuing the DYNAMICS x command, give the GPS receiver a few seconds to execute it.\u00a0 The M7’s firmware will also send a “flash save” command to the GPS receiver after the dynamics configuration is changed so that the change becomes permanent in the GPS receiver.\u00a0 Upon power-up, the GPS receiver will use the new dyncamics setting.\u00a0<\/p>\n

To verify the dynamics setting was saved, cycle power on the M7 or Atlas PL, enter the CONFIG mode, and\u00a0enter the\u00a0GX command to view the overall configuration of the device. The GPS receiver dynamics will be displayed.<\/p>\n

Advanced GPS Receiver Configuration<\/h2>\n

To facilitate the advanced user, Raveon added a\u00a0command “PASS”\u00a0in the C12 firmware.\u00a0 PASS will pass the parameter of the command to the internal GPS receiver in NMEA format. The GPS receiver used in the M7 transponder and ATLAS PL personal locator is a Trimble Copernicus II.\u00a0 The technical manual\u00a0for the Copernicus II\u00a0contains\u00a0details on how to configure it using NMEA type messages. \u00a0<\/p>\n

For example, to set the GPS receiver to AIR\u00a0mode, issue the following command while in the command mode.
\n\u00a0\u00a0\u00a0 PASS $PTNLSCR,0.60,5.00,12.00,6.00,0.0000020,0,3,1<\/em><\/p>\n

The command’s paramter is a NMEA formatted sentence without <\/span>the * or the checksum.\u00a0 The M7 or Atlas will append the * and the checksum to the sentence before sending it to the internal GPS receiver.\u00a0 To set the dynamics, use the DYNAMICS x command, not the PASS command. The PASS command is provided to the advanced user who wished to reconfigure the receiver’s low-level configiruation paramters such as signal and elevation masks.\u00a0<\/p>\n

If you change the GPS receiver’s configuration with the PASS command, do not forget to issue the save configuration command to the GPS reciever. The save command for the GPS receiver in the M7 and ATLAS PL is:
\n\u00a0PASS\u00a0 $PTNLSRT,H,2,7,0<\/p>\n","protected":false},"excerpt":{"rendered":"

The GPS receiver in Raveon’s M7 and Atlas PL GPS transponder may be configured\u00a0for different situations.\u00a0By default it is configured for LAND operation. Selecting the correct operating parameters has a significant impact on GPS receiver performance.\u00a0 GPS receiver dynamics may…<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45,40],"tags":[],"yoast_head":"\nGPS Receiver Dynamics - GPS Tracking - RavTrack Complete Real Time Tracking<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ravtrack.com\/GPStracking\/gps-receiver-dynamics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GPS Receiver Dynamics - GPS Tracking - RavTrack Complete Real Time Tracking\" \/>\n<meta property=\"og:description\" content=\"The GPS receiver in Raveon’s M7 and Atlas PL GPS transponder may be configured\u00a0for different situations.\u00a0By default it is configured for LAND operation. 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