阅读说明：本技术 一种针对非接触智能卡的干扰测试方法 (Interference test method for non-contact smart card ) 是由 杨利华 于 2021-08-26 设计创作，主要内容包括：本发明提出的一种针对非接触智能卡的干扰测试方法,由干扰器产生直流叠加干扰毛刺的波形,加载到直流叠加干扰输入端上,直流叠加干扰输入端再与桥式整流电路的直流输出端连接。在桥式整流电路的交流输入端,外接一个用于输出非接干扰的干扰天线,干扰天线放在非接触智能卡和非接读卡器之间。当非接触智能卡与非接读卡器通信时,启动干扰器,干扰器产生的直流叠加干扰毛刺的波形通过桥式整流电路耦合到非接触智能卡与非接读卡器之间的干扰天线上,干扰天线的电磁干扰信号再干扰非接触智能卡与读卡器之间的通信。(The invention provides an interference test method for a non-contact smart card, which is characterized in that a waveform of direct current superposition interference burrs is generated by an interference device and is loaded on a direct current superposition interference input end, and the direct current superposition interference input end is connected with a direct current output end of a bridge rectifier circuit. An interference antenna for outputting non-contact interference is externally connected to an alternating current input end of the bridge rectifier circuit, and the interference antenna is arranged between the non-contact smart card and the non-contact card reader. When the non-contact intelligent card communicates with the non-contact card reader, the interference unit is started, the waveform of direct current superposition interference burrs generated by the interference unit is coupled to an interference antenna between the non-contact intelligent card and the non-contact card reader through the bridge rectifier circuit, and an electromagnetic interference signal of the interference antenna interferes the communication between the non-contact intelligent card and the card reader.)

1. An interference test method for a non-contact smart card is characterized in that:

connecting the waveform of the direct current superposition interference burr generated by the interference device with the direct current output end of the bridge rectifier circuit, and connecting the interference antenna with the alternating current input end of the bridge rectifier circuit; the interference antenna is arranged between the card reader and the non-contact smart card; when the card reader communicates with the non-contact intelligent card, the interference unit is started, the waveform of the interference burr is superposed by the direct current generated by the interference unit and coupled to the interference antenna between the card reader and the non-contact intelligent card, and the electromagnetic interference signal of the interference antenna interferes the communication between the card reader and the non-contact intelligent card.

Technical Field

The invention relates to an interference test method for a non-contact smart card.

Background

The contactless smart card and the reader complete communication between the contactless smart card and the reader through electromagnetic signals with the frequency of 13.56 MHz. The non-contact intelligent card is a passive card and can only receive signals passively, after the non-contact intelligent card receives signals sent by a card reader, a part of signals generate resonance with the L/C of the non-contact intelligent card to generate power signals with instant energy, and the other part of signals are data communication signals. Since the external electromagnetic interference signal needs to be coupled in to form the interference signal, the non-contact smart card has a stronger interference signal than the contact smart card. The anti-interference test for contact smart cards has gained relatively more attention, and various anti-interference test methods for contact smart cards have been developed, while the industry has few anti-interference test methods specifically for non-contact smart cards.

Disclosure of Invention

The invention provides an interference test method for a non-contact smart card. An interference antenna for outputting non-contact interference is externally connected to an alternating current input end of the bridge rectifier circuit, and the interference antenna is arranged between the non-contact smart card and the non-contact card reader. When the non-contact smart card communicates with the non-contact card reader, the interference unit is started, the waveform of direct current superposition interference burrs generated by the interference unit is coupled to an interference antenna between the non-contact smart card and the non-contact card reader through a bridge rectifier circuit, and an electromagnetic interference signal of the interference antenna interferes the communication between the non-contact smart card and the card reader, so that a communication error code is generated in the communication process of the non-contact smart card and the card reader, and abnormal phenomena such as running and the like of a CPU (central processing unit) of the non-contact smart card are promoted.

When no non-connection signal interference exists, the communication waveform of the non-contact smart card and the non-connection card reader is a clean burr-free normal communication waveform. When the interference unit is started, because the waveform of the direct current superposition interference burr is coupled to the interference antenna, electromagnetic interference to the communication process of the non-contact intelligent card and the non-contact card reader is generated.

Drawings

FIG. 1 is a schematic diagram of communication interference in a communication process between a contactless smart card and a contactless card reader

FIG. 2 is a waveform diagram illustrating normal communication between a contactless smart card and a contactless card reader

FIG. 3 is a waveform diagram of abnormal communication between a non-contact smart card and a non-contact card reader which are interfered

Detailed Description

As shown in fig. 1, the jammer 6 generates a waveform of the dc superimposed interference spike, the waveform of the dc superimposed interference spike of the jammer 6 is loaded on the dc interference input terminal 1, and the dc superimposed interference input terminal 1 is connected to the dc output terminal of the bridge rectifier circuit 2. An interference antenna 3 for outputting non-contact interference is externally connected to an alternating current input end of the bridge rectifier circuit 2, and the interference antenna 3 is arranged between the non-contact smart card 5 and the non-contact card reader 4, namely the lower surface of the non-contact smart card 5 and the upper surface of the non-contact card reader 4. When the non-contact intelligent card 5 is communicated with the non-contact card reader 4, the interference unit 6 is started, the waveform of direct current superposition interference burrs generated by the interference unit 6 is coupled to the interference antenna 3 between the non-contact intelligent card 5 and the non-contact card reader 4 through the bridge rectifier circuit 2, and the electromagnetic interference signal of the interference antenna 3 interferes the communication between the non-contact intelligent card 5 and the card reader 4, so that communication error codes are generated in the communication process of the non-contact intelligent card 5 and the card reader 4, and abnormal phenomena such as running and the like are generated in a CPU of the non-contact intelligent card 5.

As shown in fig. 2, it is a normal communication waveform diagram of the contactless smart card and the contactless reader, at this time, since no contactless signal interference exists, the communication waveform of the contactless smart card and the contactless reader is a clean glitch-free normal communication waveform.

As shown in fig. 3, it is an abnormal communication waveform diagram of a non-contact smart card and a card reader that are interfered, at this time, an interference antenna is placed between the non-contact smart card and the non-contact card reader, when the interference device is started, because direct current superposition interference is coupled to the interference antenna, some glitch waveforms are superposed on the communication waveforms of the non-contact smart card and the non-contact card reader, so as to generate electromagnetic interference to the communication process of the non-contact smart card and the non-contact card reader.