滚动你自己的NMEA分析器或使用开源的GPS分析器？ [英] Roll your own NMEA parser or use an open source GPS parser?

问题描述

我做了很多位置感知计算，通常都包含GPS。我有我自己的一个简单的NMEA解析器，它没有做任何特别的事情 - 只是将GPS特定的句子转换成可用的数字，标志等等。

然而，那里在诸如GPSD和Gypsy等项目上进行了很多积极的开发。如果GPS是一件简单的事情，那么这些项目很快就会完成并进入维护模式。

• 他们知道/做什么我不知道，因此我的代码没有解释？
来自GPSD主管的优秀文章：




• NMEA标准不提供具有错误，大地水准面和磁性变化等的完整TPV（时间，位置，速度）元组。


• 值是在不同的句子，并没有定义的顺序，你不能很容易地知道哪个速度与哪个位置报告

<锂>一些值不是全部给出（即，年是两位数的

• 没有标准化的方式来确定供应商，型号，固件
  
• 没有标准的方式来改变设置（通信速度，句子据悉，每秒样本数等）
  
• 不兼容的二进制协议用于高级用法和更快的报告


• 由于USB到串行网桥和蓝牙有趣的竞争条件，串行网桥，改变速度是一个非常棘手的问题






-Adam




I do a lot of location aware computing, often incorporating GPS. I have my own little simple NMEA parser that doesn't do anything special - just transforms the GPS specific sentences into usable numbers, flags, and so forth.

However, there is a lot of active development done on projects such as GPSD and Gypsy. If GPS were a simple matter, the projects would have finished long ago and simply gone into maintenance mode.

• What do they know/do that I don't know about, and therefore my code doesn't account for?

解决方案

From an excellent article by the GPSD lead:

• NMEA standard doesn't provide a full TPV (time, position, velocity) tuple with error, geoid and magnetic variation, etc
• Since different values are in different sentences, and there's no defined order you can't easily know which velocity goes with which position report
• Some values are not given in full (ie, year is two digits on the more common and avilable sentences)
• No standardized way to determine vendor, model, firmware
• No standardized way to change settings (communications speed, sentences reported, samples per second, etc)
• Incompatible binary protocols for advanced usage and faster reporting
• Due to interesting race conditions for USB to serial bridges and bluetooth to serial bridges, changing the speed is a very tricky problem

-Adam

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