Abstract
In quantum key distribution experiments, ground motion is usually used to simulate satellite-based motion. The posture fluctuation of the platform affects the normal operation of the acquisition, tracking, and pointing (abbreviated as ATP) system seriously. To achieve the verification of the ground motion platform, the ATP parameters of the ground simulation motion system cannot be designed only according to the satellite-based ATP parameters. To solve this problem, a set of initial pointing system and inertial stabilization system is added to the simulation ATP system. This provides a technical solution for the ground simulation ATP system similar to the satellite-based motion platform. In the meanwhile, a tracking control strategy based on the identification method is proposed by establishing identification symbols. Compared with traditional proportion, integral, and differential (abbreviated as PID) control, this method overcomes the shortcoming of tentative modification of the control parameters and improves the stability and adaptability of the tracking control process. Tracking accuracy of ±0.1° is achieved under heavy-load conditions. This guarantees the success of the quantum key distribution (QKD) verification test of the ground motion platform.
Highlights
In an ATP system, one party of the communication link sends a wide beam of beacon light for scanning, and the other party searches for the beacon light [1]
After the beacon light enters the detector field and is detected correctly, the end units on both sides control the tracking mechanism based on the visual axis deviation provided by the detector so that its boresight follows the visual axis of the incident light [2, 3]
E technical parameters of the traditional ATP system are designed purely according to the satellite-based ATP parameters, and innovative improvements have not been made because the laser beam passes through the atmosphere and air during transmission; the geometric attenuation will occur in this process [5, 6]
Summary
In an ATP system, one party of the communication link sends a wide beam of beacon light for scanning, and the other party searches for the beacon light [1]. E PAV30 is an excellent inertial stability platform that isolates high-frequency oscillations in the pitch and roll directions of the motion platform [12]. E internal servo motor is a DC torque motor, and the three-loop motion is controlled by the wire rope pulling method It has good shock absorption and stability characteristics [13,14,15].
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