Re: [Orekit Developers] [BUG] MariniMurrayModel

[MAISONOBE Luc <luc.maisonobe@c-s.fr>]

billgacsli@163.com a écrit :

> Hi, luc, all,

Hi,

> I found a mistake in pathDelay of MariniMurrayModel.
>
> The formula to compute K is as following:
>
> final double K = 1.163 * 0.00968 * FastMath.cos(2 * latitude) -  
> 0.00104 * T0 +
> 0.00001435 * P0;
>
> which should be ('-' not '*' after 1.163):
>
> final double K = 1.163 - 0.00968 * FastMath.cos(2 * latitude) -  
> 0.00104 * T0 +
> 0.00001435 * P0;
>
>
>
> And the WaterVapor may be wrong also.
>
> The formula in the origin MariniMurrayModel is as following :
>
> final double e2 = rh / 100 * 6.11 * FastMath.pow(10, 7.5 * (T0 - 273.15)/
> (237.3 +(T0 - 273.15)));
>
> According to the above, the WaterVapor should be 1.9177 mb when rh=23.0 and
> T0=277.5,
> while it returned 192.4 by getWaterVapor. It seems a unit mistake. I am not
> sure.

Many thanks for the report.
Could you open a ticket at the forge at  
<https://www.orekit.org/forge/projects/orekit>?
You need to register to the forge in order to be able to create a
new issue. The systems asks me for confirmation, so I will allow the  
account creation
and you will be able to open the issue after that. This may take a few hours,
mainly depending on time zone and hour at which I will check my mail...

thanks again,
Luc

> best regards,
> Rongwang Li