Get ECI coordinates from measurements

[Niek]

Hey all,

I am working on an OD project and I want to convert measurements to eci position. I generated measurements using the measurement generation package. So I have an array of [range, az, el, range_rate], but now I want to simply convert them to ECI position, is there a simple way to do this? I’ve seen the use of the .estimate() function, but that only uses one measurement (for example range) and there is a discrepancy between my reference and the estimated state. Also, I’d like to do this without the use of the reference trajectory, so that if I am using real measurements, I can still use it.

I want to use the ECI position to finetune my initial guess (by using a Lambert targeter or finite differencing) for my own estimation algorithms (BLS, EKF, UKF etc)

Thanks in advance!

Cheers,
Niek

[Serrof]

Hi there

Sorry for the delayed reply.
This thread is similar to yours:

Topocentric Position to Geocentric Frame Conversion

My bad, the link I gave you @panik was for converting AzEl, which are in a topocentric frame with “geodetic” axes. As Luc pointed out, topocentric RaDec usually use inertially oriented axes. Cheers, Romain

You should be able to extract what you need. Let me know if you struggle.

Cheers,
Romain.