Servo control system and method for MSK signal loading of mechanical antenna

Abstract

The invention discloses a servo control system for MSK signal loading of a rotary permanent magnet type mechanical antenna. The rotary permanent magnet type mechanical antenna comprises a magnetic source, a motor and a controller; According to the system, according to a corresponding relation between a radiation source motion control characteristic and a mechanical antenna output characteristic, signal frequency and phase modulation are mapped to control of an average speed and instantaneous position respectively, so that a given input to a rotary servo system can be generated; and double closed-loop control is carried out on the rotating speed and the current of a motor, and meanwhile closed-loop control is carried out on the relative position of the motor. According to the method, the additional phase change + / -pi / 2 of each code element periodic signal is ensured by controlling the output relative position in real time; and the output rotating speed difference is indirectly controlled, so that the signal frequency difference meets the requirement of + / -1 / (4Ts), and the loading of MSK digital modulation signals is realized.

Description

technical field [0001] The invention belongs to the field of servo control of permanent magnet synchronous motors, in particular to a relative position closed-loop control method for mechanical antenna MSK signal loading. Background technique [0002] In the field of low-frequency electromagnetic communication, the existing low-frequency transmitting antennas are all electrically small antennas, which have problems such as low radiation efficiency, large volume and large transmission power, which limit the wide application of low-frequency electromagnetic communication in related fields. The mechanical antenna is a new type of low-frequency electromagnetic signaling technology that uses the charge or magnetic moment of mechanical movement to directly excite electromagnetic waves. According to different radiation materials and mechanical movement methods, mechanical antennas can be divided into technical systems such as vibrating electret, vibrating permanent magnet, rotating...

AI Technical Summary

Problems solved by technology

At the same time, state errors such as the position (angle) and speed (rotational speed) of the radiation source will affect the modulation performance of the mechanical antenna.

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