Communication uninterrupted control method for tracking linear polarization satellite during equator crossing process
A control method and tracking line technology, applied in the direction of control using feedback, can solve problems such as communication interruption, and achieve the effect of shortening time
Inactive Publication Date: 2015-10-28
UNIT 63680 OF PLA
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[0008] The present invention conducts research on the problems encountered by space survey ships using linearly polarized communication satellites near the equator for many times. In order to effectively solve the communication interruption problem caused by the mobile ground station crossing the equator in satellite communication, it improves the performance of the mobile carrier near the equator. Based on the existing technology, a practical, effective and highly practical control method for tracking linearly polarized satellites across the equator without interruption of communication is proposed
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[0030] figure 1 For the flow chart of this method, based on hardware design, the required functions are realized through software control, and the specific steps are as follows:
[0031] 1. Improved design of the rotation range of the antenna polarization plane adjustment mechanism
[0032] When using linearly polarized satellites for communication, the polarization angle ranges from -90° to +90°. In the past, when designing ground station antennas, the rotation range of the antenna polarization plane is usually considered to be -90° to +90°. For For fixed stations and land mobile stations, it can meet the needs of use. However, for mobile ground stations such as ocean-going ships that need to maneuver in a large area around the world, using the above-mentioned traditional design, when the polarization angle changes by 180° when crossing the equator, the antenna polarization plane needs to be reversed by 180° accordingly. The adjustment process will cause a communication int...
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The invention discloses a communication uninterrupted control method for tracking a linear polarization satellite during the equator crossing process. The method comprises two parts, namely the design for improvement of the antenna polarization plane adjustment mechanism of a ground station and the design for the polarization control program of an antenna control unit. The polarization control program comprises the steps of calculating the linear polarization angle theta of the current location; judging whether a ground station enters the equatorial region or not; judging whether the ground station has passed the equator or not, and on the condition that the ground station has passed the equator, controlling and rotating the antenna polarization plane of the ground station at a corresponding angle theta' (theta'=theta+ / -180 degrees) on the basis of different strategies, according to the calculated result of the theoretical linear polarization angle theta; on the condition that the actual angle theta' of the antenna polarization plane reaches a limit position, starting the antenna re-acquiring program. In this way, the polarization plane is reversely rotated to be consistent with the angle theta. During the above process, the communication is interrupted for several minutes, and the equator-crossing adjustment is completed. According to the technical scheme of the invention, the communication interruption due to the reverse rotation of the polarization plane during the navigation around the equator can be effectively avoided. Therefore, the method has an important significance on improving the task completion capability around the equator.
Description
technical field [0001] The invention belongs to the field of automatic control of aerospace measurement and control technology, and relates to the technology of controlling the polarization surface of ground station antennas in satellite communication, in particular to a method for controlling the uninterrupted communication of tracking linearly polarized satellites across the equator. Background technique [0002] The polarization of an electromagnetic wave refers to the way in which the spatial orientation of the wave's electric field vector changes with time at any fixed point in space. There are three kinds of polarization of the wave. If the sagittal trajectory of the electric field is a straight line, the wave is a linearly polarized wave; if the sagittal trajectory of the electric field is a circle, the wave is a circularly polarized wave; if the sagittal trajectory of the electric field is an ellipse, the wave is Elliptically polarized waves. Linear polarization and...
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Inventor 林习良李康周锦标赵乾宏吕少华耿大孝钱小云顾夏华孙文杰孔令志
Owner UNIT 63680 OF PLA