Comparison between EKF3 output of AOA and AOS angles without GPS and otherwise

hi Everyone, I appreciate your work, and encounter some case to compare AOA and AOS data received from EKF with GPS and without, so correct values AOS angle is critically important for computations in my code, please If someone have deal with these cases please react, and share results, I have researched this topic and find hardware which is very expensive.

thank you