nmea

I get GPS fix times with millisecond precision on my Nexus 7 (sometimes) as well as my Galaxy S3 (almost always). By this I mean the millis are not "000". To make sure this was not fake time resolution introduced by the Android system, I am also capturing the NMEA sentences. And I cannot seem to find where the millis are coming from! First, the Galaxy S3. The fix time is XX.07.55.318 (XX is hours, doesn't matter). You will see this sentence (see below for logs from both Galaxy and Nexus) $GPGGA,140755.3,3920.030827,N,07721.484989,W,1,07,1.5,165.6,M,-42.0,M,,*66 That explains the "3xx" in the

Hy everybody! I wrote a small gps application in simple C++, what switch the protocoll, send command to the gps chip...etc. The write to the GPS port is working good. But when I try to read the port (for check the accepted commands) I receive a lot of stupid characters. Normally an NMEA output message is something like this: $GPGLL,4916.45,N,12311.12,W,225444,A And I received similar: 1C0CFC14 I dont know whats wrong... This part of my code is the next: LPCVOID buffer[100]; ReadFile(hSerial, buffer, 100, 0, 0); Or an other for log some data: LPCVOID buffer[100]; ReadFile(hSerial, buffer, 100,

i am trying to parse the incoming GPGGA NMEA GPS string using Arduino uno and below code. What i am trying to do is that i am using only GPGGA NMEA string to get the values of Latitude, longitude and altitude.In my below code, i had put certain checks to check if incoming string is GPGGA or not, and then store the further string in a array which can be further parsed suing strtok function and all the 3 GPS coordinates can be easily find out. But i am unable to figure out how to store only GPGGA string and not the further string.I am using a for loop but it isn't working. I am not trying to use

I have a Mio P550 device, which has a GPS included. I try to use SerialPort to get NMEA sentences, by simply use SerialPort.Read(). Data is returned in some weird encoding. GPS should return NMEA sentences in ASCII, but it doesn't. Here is my code for reading: dataLength = this.serialPort.Read(buffor, 0, Gps.BUFFOR_LENGTH); Debug.WriteLine("data length: " + dataLength); if (dataLength > 0) { for (int i = 0; i < dataLength; i++) { char c = Convert.ToChar(buffor[i]); if (c == '\r' || c == '\n') { string data = stringBuilder.ToString(); Debug.WriteLine("data readed: " + data); if (data.StartsWith

I want to display a signal bar for a GPS device using .NET CF. I'm able to read NMEA data and get the SNR signals. But they are a number of satellites with some active and some inactive with various SNRs. I thought about getting average of total SNR but it won't give a accurate value as three strong signal satellite is enough for GPS fix and with another 5 satellites with bad SNR can mess up the signal bar calculation. How am I gonna calculate GPS signal in percentages in a proper way? Use the GSA NMEA sentance to get the Dilution of Precision : This sentence provides details on the nature of

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. Am looking for C# open source NMEA parser. Well, I'm not familiar with it myself, but some quick searches show one on CodeProject , which links to 2 other such, here and here . Any of those help? check out sharpGPS . there are several other gps and nmea related projects o codeplex too FWIW, it's not hard (10-40 LOC) to parse the basic ones your self. If you find you need to do this, here is a link with some useful info.