Galileo system uses Interplex modulation to broadcast navigation signals at the E1 frequency. Due to the lack of prior information such as E1 signal power allocation and pseudo-code sequences

researchers can only carry out limited signal quality characteristics studies. Aiming at this problem

this paper proposes a signal-in-space quality assessment method based on high gain antenna

which realizes the analysis of E1 authorization signal and perfects the E1 signal evaluation system. The related power method is proposed to solve the signal component power ratio problem. The tracking result is used to solve the phase deviation estimation problem. A new time domain waveform separation method combining weighted combination averaging and code phase averaging is proposed

which overcomes the influence of message and code Doppler on time domain waveform characteristics evaluation. The S-curve offset Biases (SCB) parameters are used to quantitatively evaluate the signal ranging deviation. In this paper

the Galileo GSAT-0214 satellite is evaluated by this method. The results show that the signal component SCB of E1 is less than 0.2 ns

and the ranging performance is excellent. The multiplexing efficiency is 97.8%

which is better than GPS L1 signal and BOS-3 system B1 signal.