The star method

The so-called antenna to star actually refers to the process of pointing the antenna beam center to the target satellite by adjusting the azimuth Angle, pitch Angle and polarization Angle of the antenna. It is the basis for the network access verification and daily service transmission of the earth station. Only by accurately targeting the target satellite can the earth station work stably and reliably. The satellite work can be completed by the user himself or with the assistance of the ground measurement and control center of the satellite company. According to the different types of antenna, the antenna to star method is generally divided into three types: Single receiving station (feedforward or partial feed antenna) to star: TV single receiving stations or other DVB data receiving stations mostly adopt the self-star mode. By adjusting the antenna to maximize the signal intensity and signal quality displayed on the satellite digital TV receiver or reception card. This method is simple to operate, but with poor accuracy. The specific operation steps are described as follows: 1) Measure the local latitude and longitude data with GPS under the antenna (or use the relevant data from the nearest big city); 2) Calculate the azimuth AZ, elevation EL and polarization angle POL (theoretical value) of the local antenna aiming at the target satellite; 3) Adjust the antenna elevation angle to the theoretical value using the geological compass (or inclination ometer); 4) Connect the LNB and the receiver / receiver card, and adjust to the required polarization direction (rough adjustment); 5) Select the known TV program or data broadcast signal on the target satellite, and the user sets the center frequency, symbol rate and forward error correction rate of the receiver / receiving card as the parameters of the known signal; 6) Adjust the antenna pointing and lock the receiving signal, so that the receiver / receiving card displays the strongest received signal strength and the best signal quality; 7) Fixed antenna azimuth, pitch Angle and polarization Angle, to complete the star. When selecting the target signal, you can use the carrier signal of the existing broadband signal / TV program on the target satellite, the carrier signal transmitted by the main station of the network, and request the business operation center of the satellite company to transmit the digital TV signal. Two-way station on the star VSAT two-way station generally uses the star pair method, using the spectrometer to receive the strongest isopolarization satellite beacon signal (the corresponding antipolarization beacon signal is submerged in the noise bottom). The Ku frequency band generally has two mutually orthogonal beacon signals, and the C frequency band generally uses the telemetry signal as the reference signal for the star. This method is more accurate for stars. The specific operation steps are described as follows: 1) Measure the local latitude and longitude data with GPS under the antenna (or use the relevant data from the nearest big city); 2) Calculate the azimuth AZ, elevation EL and polarization angle POL (theoretical value) of the local antenna aiming at the target satellite; 3) Adjust the antenna elevation angle to the theoretical value using the geological compass (or inclination ometer); 4) Rotate the feed component, rough and adjust the polarization Angle; 5) Slowly rotate the antenna azimuth in a large range to find the beacon signal of the target satellite; 6) The