A low frequency alternating magnetic field distance control method

Abstract

The invention relates to a radio frequency device and a distance control method for a low-frequency alternating magnetic field. The radio frequency device comprises a magnetic signal transceiver and a radio frequency communication unit. The magnetic signal transceiver is used for generating, transmitting and receiving low-frequency alternating magnetic field signals, and the radio frequency communication unit is used for exchanging information via radio frequency communication. The distance control method for the low-frequency alternating magnetic field includes the steps of circularly switching a low-frequency transmitting passageway and a low-frequency receiving passageway to transmit a first low-frequency alternating magnetic field signal and receive a second low-frequency alternating magnetic field signal; controlling communication distance according to the transmitted first low-frequency alternating magnetic field signal and the received second low-frequency alternating magnetic field signal so as to enable the radio frequency device to realize information exchange within a preset distance range. By the aid of the radio frequency device and the distance control method for the low-frequency alternating magnetic field, swiped transactions such as electronic payment of various mobile terminals can be realized safely within a preset card swiping distance range, and calibration of the mobile terminals is omitted.

Description

technical field [0001] The invention relates to the communication field, in particular to a distance control method of a low-frequency alternating magnetic field. Background technique [0002] With the popularization of mobile terminals, there is an urgent demand for mobile payment applications using mobile terminals. Currently, there are many implementation schemes, but each has its own disadvantages. At present, it has appeared in the mobile terminal SIM (Subscriber Identity Module) card, SD (Secure Digital Memory Card) card, Micro-SD card or mobile terminal motherboard, adding radio frequency functions, making the mobile terminal a recharge, consumption, transaction, A super intelligent terminal for identity authentication. In this solution, the radio frequency adopts UHF (Ultra High Frequency, ultra-high frequency) technology, so that after the radio frequency module is embedded in the mobile terminal, it can still be transmitted, so that the function of data communicat...

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Problems solved by technology

[0004] However, in the above improvement scheme, the low-frequency communication uses one-way communication from the radio frequency device to the mobile communication device. When the radio frequency device is maliciously tampered with, such as increasing its low-frequency transmission power and improving its radio frequency receiving sensitivity, etc., it will cause loading The communication distance between a mobile terminal with a mobile communication device and the tampered radio frequency device increases, resulting in unsafe card swiping distances exceeding the predetermined card swiping distance, etc., directly affecting the user's experience and effect of swiping cards

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