Method for measuring loss of large-scale double-reflector antenna

[0049] A method of measuring the loss of a large dual reflector antenna, comprising the following steps:

[0050] (1) Measure the power gain of the antenna. By measuring the Y factor of the ratio of the noise power of the large double-reflector antenna to the radio source and its nearby clear sky, the power gain of the antenna is calculated using the following formula.

[0051]

[0052] where:

[0053] G—the power gain of the antenna, dBi;

[0054] k—Boltzmann constant, k=1.38×10 -23 J / K;

[0055] T—Antenna system noise temperature, K;

[0056] λ—working wavelength, m;

[0057] S—the flux density of the radio source, Wm -2 Hz -1 ;

[0058] Y - the measured Y factor;

[0059] K 1 - Atmospheric attenuation correction factor, dB;

[0060] K 2 - Beam widening correction factor, dB.

[0061] (2) Measured antenna directivity gain. Using satellite beacons, measure the azimuth power pattern and elevation power pattern of the antenna, and use P for the azimuth power pat