Contactless reader/writer
A non-contact, reader-writer technology, which is applied in the direction of instruments, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem of not being able to identify the direction, speed and quantity, as well as the layout of surrounding obstacles, detailed communication environment, secondary Level echo, receiving power does not necessarily correspond to the distance, etc.
Inactive Publication Date: 2006-09-27
PANASONIC CORP
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Problems solved by technology
[0007] However, there are some problems in such distance measurement in the prior art non-contact type reader / writer, for example, only poor resolution can be obtained in the calculation based on the response time from the non-contact type information storage carrier, and it may occur secondary echo
Also, in the calculation based on the received power from the non-contact type information storage carrier, some problems also arise, for example, since the received power changes depending on the change of the orientation of the non-contact type information storage Power does not necessarily correspond to distance
[0008] And, although the distance to the non-contact type information storage carrier is detectable, the detailed communication environment such as the direction, speed, and number, and the arrangement of surrounding obstacles cannot be recognized
Therefore, a system that optimizes in real time depending on the communication environment has not yet been constructed
Method used
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no. 1 Embodiment
[0042] figure 1 is a diagram showing a schematic configuration of a communication system including an RF tag 1 and a non-contact reader / writer 3 that communicates with the RF tag 1 . exist figure 1 , reference numeral 1 denotes an RF tag serving as an example of a non-contact information storage carrier. Reference numeral 2 denotes an obstacle surrounding the RF tag 1 . Although in figure 1 Only one obstacle is shown in , but it represents all objects except the RF tag 1 used as a communication target. Reference numeral 3 denotes a non-contact reader / writer that communicates with the RF tag 1 .
[0043] The configuration of the non-contact reader / writer 3 is described below.
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It is an object of the invention to provide a contactless reader / writer comprising a transmission section for transmitting a plurality of transmission signals using carrier waves of different frequencies, a reception section for receiving a plurality of reply signals which are a response to a plurality of transmission signals transmitted by the transmission section, a phase calculation section for calculating phase data of the reply signals on the basis of the reply signals, a distance calculation section for calculating a distance to an object having returned the reply signal, on the basis of the phase data from the phase calculation section and / or a speed calculation section for calculating a frequency component of baseband signals on the basis of the baseband signals acquired from the received signal, and thereby calculating a traveling speed of an object having returned the reply signal on the basis of the frequency component, and a control section for controlling a transmission direction of the transmission signals transmitted from the transmission section.
Description
technical field [0001] The present invention relates to a contactless reader / writer that communicates with contactless information storage carriers such as RF (Radio Frequency) tags and RF cards. Background technique [0002] During the communication between the contactless reader / writer and the RF tags and RF cards used as contactless information storage carriers, the communication environment may change depending on the situation. Such a communication environment includes the location, speed and number of non-contact information storage carriers and the arrangement of surrounding obstacles. Therefore, ideal communication quality can be obtained when the entire system of the contactless reader / writer such as parameters of the sending and receiving sections in the contactless reader / writer, communication process and communication area are optimized in real time depending on the communication environment . [0003] As a first step to achieve this, the detailed communication...
Claims
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IPC IPC(8): G01S13/84G01S5/12G01S13/34G01S13/82
CPCG01S13/84G01S13/348G01S5/12G01S13/345G01S13/825
Inventor 宫下功宽
Owner PANASONIC CORP