AGC (Automatic Gain Control) level satellite searching based rapid locking method

Abstract

The invention discloses an AGC (Automatic Gain Control) level satellite searching based rapid locking method. The AGC level satellite searching based rapid locking method comprises the following steps of setting a threshold of the AGC level; determining the width of the threshold; scanning and searching a satellite through the threshold of the AGC level and the width of the threshold and stopping the search after the searching is successful; returning the azimuth back to an azimuth angle which is corresponding to a maximum value in AGC level values which are stored temporarily and namely accurately aligning the satellite to achieve the locking of the satellite. According to the AGC level satellite searching based rapid locking method, the threshold of the AGC level is set, the satellite is searched through the non-fixed threshold width which is correspondingly adjusted along with the signal strength, and accordingly the impact caused by the interference and the signal strength can be avoided and the search is stopped after the searching is successful, the azimuth is returned back to the azimuth angle which is corresponding to the maximum value in the AGC level values which are stored temporarily, and accordingly the step for searching the azimuth center position is omitted, the time of the fine adjustment on the satellite searching is saved, the rapid communication can be implemented through a mobile ground station, and the time is saved at critical moments such as the emergency communication.

Description

technical field [0001] The invention relates to a satellite searching method for an automatic satellite satellite antenna in the field of satellite communication, in particular to a fast locking method for searching satellites based on AGC level. Background technique [0002] The two-axis or three-axis automatic satellite search satellite antenna in the field of satellite communication undertakes the task of finding stars, such as a series of antennas for mobile ground stations such as communication antennas in motion, receiving antennas in motion, communication antennas in static and receiving antennas in static. [0003] The satellite antenna with automatic star-seeking may find the wrong satellite or not lock the main lobe of the satellite during the star-finding process, or it may take a long time to lock the correct satellite and the main lobe of the satellite. Now the most commonly used method of finding stars includes the following steps: 1. Locate the geographic loca...

AI Technical Summary

Problems solved by technology

[0008] 2. The use environment is ever-changing, and it will be interfered by other communication equipment, resulting in irregular fluctuations in the AGC level value, such as figure 2 As shown in , when there is an interference signal, the interference signal will be superimposed on the satellite signal, making it produce irregular fluctuations

[0009] 3. Changes in the use environment will encounter other obstacles that block the signal

[0010] 4. There are a large number of synchronous satellites on the equator of the earth, and the forwarding frequency overlaps or is similar, which is easily interfered by other satellites

[0011] 5. The satellite signal is greatly affected by the weather, and the AGC signal changes greatly

[0013] The first method uses the maximum value of the AGC level to lock the satellite and needs to scan the rotation range of the azimuth. The disadvantage is: the AGC level is easily affected by interference and it takes a long time to find the wrong satellite; the second method uses the beacon receiver to lock. The signal is used as the correct satellite signal. Disadvantages: The beacon receiver is easily affected by interference to find the wrong satellite, and it is easy to lock the side lobe of the satellite

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