NtripShare全站仪自动化监测之气象改正

news2024/9/21 10:41:44

最近有幸和自动化监测领域权威专家进行交流，讨论到全站仪气象改正的问题，因为有些观点与专家不太一致，所以再次温习了一下全站仪气象改正的技术细节。

气象改正的概念

全站仪一般利用光波进行测距，首先仪器会处理测距光波的相位漂移引起的测距误差。但实际应用中因为光波在大气中穿透受大气温度、气压、大气成分变化(特别是二氧化碳浓度影响)、密度、大气湿度等客观条件的影响，所测距离要经过相关气象条件改正才能得到正确的真值。一般情况下只改正大气温度、大气气压和大气湿度对测距的影响。

气象改正的公式

以上公式引用于徕卡TS16用户手册

GEOCOM气象改正代码

 /// <summary>
 /// 设置气象参数
 /// </summary>
 /// <param name="Lambda"> Wave length of the EDM transmitter [m]   通常为0.000000658</param>
 /// <param name="Pressure"> Atmospheric pressure [mbar]</param>
 /// <param name="DryTemperature">Dry temperature [°C]</param>
 /// <param name="WetTemperature">Wet temperature [°C]</param>
 /// <returns></returns>
 public GeoComResult TMC_SetAtmCor(double Lambda, double Pressure,
                                  double DryTemperature, double WetTemperature)
 {
     onSendMessage("TMC_SetAtmCor");
     string req = createRequest(2028, Lambda + "," + Pressure + "," + DryTemperature + "," + WetTemperature);
     GeoComResult result = senCommond(req);
     if (result != null)
     {
         result.CommondName = "TMC_SetAtmCor";
     }

     return result;
 }


 /// <summary>
 /// 获取气象参数
 /// </summary>
 /// <returns></returns>
 public GeoComResult TMC_GetAtmCorr(ref TMC_ATMOS_TEMPERATURE tMC_ATMOS_TEMPERATURE)
 {
     onSendMessage("TMC_GetAtmCorr");
     string req = createRequest(2029, "");
     GeoComResult result = senCommond(req);

     if (result != null)
     {
         result.CommondName = "TMC_GetAtmCorr";
         if (result.RC == RETURN_CODES.RC_OK)
         {
             tMC_ATMOS_TEMPERATURE = new TMC_ATMOS_TEMPERATURE();
             tMC_ATMOS_TEMPERATURE.Lambda = double.Parse(result.Result[0]);
             tMC_ATMOS_TEMPERATURE.Pressure = double.Parse(result.Result[1]);
             tMC_ATMOS_TEMPERATURE.DryTemperature = double.Parse(result.Result[2]);
             tMC_ATMOS_TEMPERATURE.WetTemperature = long.Parse(result.Result[3]);
         }
     }
     return result;
 }