间歇性移动 GPS Lat/Long 值不会改变

Question

我一直在使用 SIM28 GPS 模块，但遇到了问题。问题是 GPS 纬度和经度值在设备移动时不会改变，有时纬度和经度值在两分钟或更长时间内保持不变。 GPS 单位为运行的时间大约有 50% 会发生这种情况。当 GPS 值恢复（再次开始改变）时，实际位置会有很大的跳跃。

我的配置是：

两个 SIM28 GPS 模块运行串联。
每个模块都有一个好的天线（http://php2.twinner.com.tw/files/onshine/ANT555-2006-NEW.pdf）。 GPS 天线安装在带有薄塑料船体的无线电遥控 RC 帆船内（但安装在外部时也有同样的问题）。
波特率设置为9600
NMEA 频率为 4 赫兹
返回的NMEA语句是GGA和RMC。

有趣的是，两个 GPS 装置在相似的时间做同样的事情。

可能是一个因素的一件事可能是帆船的摇晃（风吹时帆船如何摇晃到一边），但我做了一些分析，我没有看到这里的相关性。 更新： SIM28模块在开阔视野开阔，直视天空的地方也有这个问题。

下面是一个输出示例（只有一个接收者和 GGA 句子）。 "good" 值标记为 #:

    $GPGGA,212131.500,3648.5591,S,17445.0304,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7C # 
    $GPGGA,212131.750,3648.5591,S,17445.0304,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7B # 
    $GPGGA,212132.000,3648.5590,S,17445.0305,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7A # 
    $GPGGA,212132.250,3648.5590,S,17445.0306,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7E # 
    $GPGGA,212132.500,3648.5590,S,17445.0307,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7D # 
    $GPGGA,212132.750,3648.5590,S,17445.0307,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7A # 
    $GPGGA,212133.000,3648.5590,S,17445.0308,E,2,11,0.86,3.0,M,26.5,M,0000,0000*76 # 
    $GPGGA,212133.250,3648.5590,S,17445.0309,E,2,11,0.86,3.0,M,26.5,M,0000,0000*70 # 
    $GPGGA,212133.500,3648.5590,S,17445.0310,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7A # 
    $GPGGA,212133.750,3648.5590,S,17445.0310,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7D # 
    $GPGGA,212134.000,3648.5590,S,17445.0311,E,2,11,0.86,3.0,M,26.5,M,0000,0000*79
    $GPGGA,212134.250,3648.5591,S,17445.0311,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7F # 
    $GPGGA,212134.500,3648.5591,S,17445.0312,E,2,11,0.86,3.0,M,26.5,M,0000,0000*7E # 
    $GPGGA,212134.750,3648.5591,S,17445.0312,E,2,11,0.86,3.0,M,26.5,M,0000,0000*79 # 
    $GPGGA,212135.000,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*78
    $GPGGA,212135.250,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7F # 
    $GPGGA,212135.500,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7D
    $GPGGA,212135.750,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7A
    $GPGGA,212136.000,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7B
    $GPGGA,212136.250,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7C
    $GPGGA,212136.500,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7E
    $GPGGA,212136.750,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*79
    $GPGGA,212137.000,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7A
    $GPGGA,212137.250,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7D
    $GPGGA,212137.500,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*7F
    $GPGGA,212137.750,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*78
    $GPGGA,212138.000,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*75
    $GPGGA,212138.250,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*72
    $GPGGA,212138.500,3648.5592,S,17445.0312,E,2,11,0.86,3.1,M,26.5,M,0000,0000*70

Answer 1

问题似乎出在 SIM28 GPS 模块上。我用过u-blox NEO-6M模块，效果很好

我猜是 SIM28 有一些有问题的噪音过滤。 u-blox 比较嘈杂，但我更喜欢自己过滤噪音，而不是让 GPS 装置来过滤。

间歇性移动 GPS Lat/Long 值不会改变

While moving GPS Lat/Long values intermittantly don't change

gps

nmea