Dear Ranjan,

A meeting yesterday where we discussed ARTS got me to remember that you don't need iyRadioLink here. The special with iyRadioLink is that it calculats some special effects, such as defocusing. To just calculate the transmission between two points can be done by iyTransmissionStandard if it is combined with ppathFromRtePos2. Like this:

AgendaSet( iy_main_agenda ){
  Ignore( iy_unit )
  Ignore( iy_id )

So if you set rte_pos2 to the position in the atmosphere in consideration, and set sensor_pos to hold the position of the transmitter and the receiver, you will get out two transmissivities that together give you the atmospheric transmissivity between sender and receiver for scattering at the point given by rte_pos2.

You did not state a frequency of the radar. If we talk about existing radars below 100 GHz, the transmissivity will be quite high and the question is if this is of concern for you. If you want to do some rough estimates.

The dominating term will be the strength of scattering. To estimate this you need first of all to find data on the size distribution of the (dust?) particles and scattering properties. If the particles are small compared to the wavelength, you can likely start with Mie calculations but you still need to specify sizes and refractive index.

You also need to consider the antenna pattern, both of the transmitter and receiver, for the direction towards rte_pos2.



On 2021-09-02 15:58, Ranjan Mehta wrote:
Dear Patrick,

Thanks for the prompt response !

Can you provide some pointers on how we can create a bi-static configuration ?

We were thinking of two things:

1. Either see if iyRadioLink can be studied and then modified to bi-static 

2.  Look at the iyRadar :  but it only looks are purely back scattered 
radiation:  and it takes Z based on the back-scattering direction,
        If we can put the transmitter at the same place, and change the sensor 
position,  and use Z  based on the sensor-LOS direction (i.e. relative to the 
transmitter LOS),  could we then use the iyRadar use case ?

Please let us know! And ARTS is a phenomenal tool !  Just awesome  (We are not 
atmospheric scientists, but can still understand a lot from how ARTS is 
developed, structured and documented!!)

More later!


Ranjan S. Mehta, Ph.D.
Director / Senior Principal Engineer
CFD Research Corporation

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-----Original Message-----
From: Patrick Eriksson <>
Sent: Thursday, September 2, 2021 1:19 AM
To: Farid Alam <>;; 
Ranjan Mehta <>
Subject: Re: [arts-users] iyRadioLink: Unknown Method

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Farid, Ranjan,

Looks like method "*iyRadioLink*" is missing in ARTS 2.4.0, and ARTS
2.5.0 (dev).

Sorry, there is no replacement in v2.4 or v2.5. It should be resurrected to v3, 
but unclear when that version will appear.

I take the opportunity to also answering the question from Ranjan, sent to me 

1. Source  and receiver are similar to a bi-static radar arrangement.
2. And the cloud is more of a  "dust-cloud" than hydrometeors !

Unfortunately, there is no ready setup in ARTS for bistatic radars.
Simply as we have never encountered such an user case.

Is it the case that you want to solve this by iyRadioLink? That would be a 
possibility, but you have then to switch to v2.2.

Please note that you in any case have to provide the scattering data for dust 

Kind regards,


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