Method for analyzing working performance of damaged satellite-earth data transmission antenna

A method for analyzing the working performance of a damaged satellite-earth data transmission antenna comprises the steps of (1) calculating the equivalent isotropic radiated power (EIRP) of a satellite according to the output power of a satellite transmitter, satellite antenna gain and the transmission channel loss value; (2) calculating the maximum slant range R of signal transmission according to the mean terrain level of a satellite and the minimum elevation of a ground receiving antenna; (3) calculating the free space loss Lf of a signal according to the downlink carrier frequency of the satellite data transmission signal and R; (4) calculating all transmission losses L of the data transmission signal according to the atmosphere loss, the directivity loss of the receiving antenna, the polarization loss and atmosphere value of the receiving antenna and Lf; (5) calculating the bit signal to noise ratio of a received signal by means of the coding gain, the transmission code rate, the coding rate and the link margin; (6) calculating the bit signal to noise ratio actually needed by the received signal according to bit error rate requirements so as to obtain the channel margin, wherein if the margin is positive, the overall performance of the damaged data transmission antenna can still meet the requirements of a system, and the working performance of the data transmission antenna is affected otherwise.