A low-frequency communication system of a rotary electret mechanical antenna

Abstract

The invention provides a low-frequency communication system of a rotating electret mechanical antenna, belonging to the technical field of low-frequency communication. The system of the invention comprises a low-frequency magnetic field signal generating module and a magnetic induction signal receiving module. The low frequency magnetic field signal generation module comprises a motor and a charged electret in a mechanical antenna; the motor in the mechanical antenna is controlled to produce different rotational speed, electret is driven to rotate, magnetic field signals of different frequencies are produced. A desired communication signal is loaded onto the generated magnetic field signal, and the signal is transmitted to the receiving direction by a mechanical antenna. The magnetic induction signal receiving module receives the transmitted magnetic field signal through the magnetic field sensor, and demodulates and acquires the required communication signal. The invention utilizes the characteristics of ultra-low frequency and very-low frequency radio waves, adopts the method that a motor drives a charged electret to rotate, forms a low-frequency alternating magnetic field and transmits a magnetic field signal, can greatly reduce the antenna length and power consumption of a radio transmitter, and realizes stable low-frequency radio communication.

Description

technical field [0001] The invention relates to the technical field of low-frequency communication, in particular to a low-frequency communication system of a radio transmitter implemented in a mechanically driven manner. Background technique [0002] Low-frequency communication technology is a technology that uses ultra / very low frequency spectrum segments in the radio spectrum for wireless communication. Compared with communication in other frequency bands, low-frequency communication has many advantages, mainly in the following aspects: [0003] The ultra-low frequency signal is propagated by the huge "waveguide" between the earth's surface and the ionosphere, and the atmospheric attenuation is very small. For example, when working at 75Hz, the atmospheric attenuation is 0.9-1.5dB per thousand kilometers, which can make the low-frequency signal transmit to a long distance. Global communications can be carried out with only one transmitter station. At the same time, its ...

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Problems solved by technology

The size of the shore launch station is huge, the antenna covers a wide area, there are several to dozens of iron towers, and the antenna is exposed, the target is obvious, and the survivability in wartime is poor. It is very easy to be destroyed and difficult to repair in a short period of time.

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