CN104881695A - Ultrahigh frequency RFID reader-writer device and channel hopping method - Google Patents
Ultrahigh frequency RFID reader-writer device and channel hopping method Download PDFInfo
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- CN104881695A CN104881695A CN201510321593.6A CN201510321593A CN104881695A CN 104881695 A CN104881695 A CN 104881695A CN 201510321593 A CN201510321593 A CN 201510321593A CN 104881695 A CN104881695 A CN 104881695A
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Abstract
The invention provides an ultrahigh frequency RFID reader-writer device and a channel hopping method. The invention relates to the field of wireless data communication, and the ultrahigh frequency RFID reader-writer device includes a multi-channel wireless communication module (1) and an FPGA realization reader-writer (2), the multi-channel wireless communication module (1) is connected with the FPGA realization reader-writer (2) through serial interfaces, and the FPGA realization reader-writer (2) includes a serial-parallel data conversion module (3), a channel hopping scheduling portion (4), a data transmit-receive module, and a host computer interface (5). The I/Os of the FPGA are large in quantity, the acquisition speed is fast, the data transmitted by the multiple channels are parallelly processed, labels in a network are coordinated through the distribution of the channels by the reader-writer, so that collision can be prevented possibly and the collision rate can be greatly reduced. The ultrahigh frequency RFID reader-writer device and the channel hopping method can parallelly process the data transmitted by the multiple wireless channels and can improve the reading-writing speed.
Description
Technical field:
The present invention relates to field of wireless data communication, be specifically related to the ultrahigh frequency radio frequency identification (RFID) reader device based on the realization of FPGA and hop channel method.
Background technology:
REID (RFID, Radio Frequency Identification) is actually the embody rule of automatic identification technology (AEI, Automatic Equipment Identification) in radiotelegraphy and development.The basic thought of this technology is, by adopting the technological means of some advanced persons, realizes people to the automatic identification under different conditions (mobile, static or rugged surroundings) of each type objects or equipment (personnel, article) and management.The advantages such as active RFID possesses low emissive power, communication distance is long, transmitted data amount large, and the high and compatibility of reliability is good obtain to be greatly developed.
Current active RFID system can be operated in 433MHz, 2.45GHz, 5.8GHz equifrequent.But because 2.4GHz belongs to ISM band, the agreement based on this frequency range is numerous and diverse, and the device type being operated in this frequency range is numerous, can the active RFID system being operated in 2.4GHz be impacted.Another active RFID system is inner, read write line and label information mutual time, can compete and conflict relationship between label, therefore propose a kind of collision-proof method and can improve system works efficiency.
Summary of the invention:
The object of this invention is to provide a kind of ultrahigh frequency radio frequency identification (RFID) reader device and hop channel method, the I/O quantity of its FPGA is many, picking rate is fast, the data of the multiple transmission of the process that can walk abreast, in network, label is coordinated mutually by the distribution of read write line to channel, and collision free occurs as far as possible, greatly reduces collision rate, the data of the multiple wireless channel transmission of the process that can walk abreast, can improve read or write speed again simultaneously.
In order to solve the problem existing for background technology, the present invention is by the following technical solutions: its ultrahigh frequency radio frequency identification (RFID) reader device comprises multiple channel wireless communication module (1) and FPGA realizes read write line (2), multiple channel wireless communication module (1) realizes read write line (2) by serial line interface with FPGA and is connected, and FPGA realize read write line (2) comprise string and data conversion module (3), hop channel scheduling portion (4), data transmit-receive module and host computer interface (5).
Described multiple channel wireless communication module (1) is by CC2530 chip, and crystal oscillating circuit, reset circuit, impedance matching circuit, antenna, plug connector forms.
Described string data conversion module (3) are responsible for receiving multiple channel wireless communication module (1), string also data conversion module (3) provides data buffer storage queue, data is inserted buffer memory and is supplied to hop channel scheduling portion (4) process.The instruction that host computer is issued by serial RS232 interface by also data conversion module (3) of going here and there, sends multiple channel wireless communication module (1) to, sends multiple label further to.
Described hop channel scheduling portion (4) provides FPGA to realize the hop channel dispatching method of anticollision in read write line (2) and label communication.Initialization FPGA realizes read write line (2), and (1) four the sub-module initialization of multiple channel wireless communication module is identical channel, receives active label data.First to the data markers timestamp with label ID that serial ports receives, then the timestamp of record is added up, when the label data of certain ID add up the reading time exceed certain threshold value time, hop channel scheduling portion (4) sends instruction, label is sent to by N number of submodule in multiple channel wireless communication module (1), pressure is given this label and is changed transmitting channel, hop channel scheduling portion (4) sends modifying of order multiple channel wireless communication module (1) N+1 submodule receive channel simultaneously, the label that channel value launches channel with amendment is set to same channel.
Described data transmit-receive module and host computer interface (5) to be responsible for many label datas of reading, by RJ45 interface or serial ports, sending upper computer software to and being further processed; The instruction that data transmit-receive module and host computer interface (5) are responsible for being issued by RJ45 interface or serial ports reception host computer sends multiple channel wireless communication module (1) to and is handed down to 2.4GHz active label.
The I/O quantity of FPGA of the present invention is many, picking rate is fast, the data of the multiple transmission of the process that can walk abreast, in network, label is coordinated mutually by the distribution of read write line to channel, collision free occurs as far as possible, greatly reduce collision rate, the data of the multiple wireless channel transmission of the process that can walk abreast, can improve read or write speed again simultaneously.
Accompanying drawing illustrates:
Fig. 1 is ultrahigh frequency radio frequency identification (RFID) reader block schematic illustration in the present invention,
Fig. 2 is hop channel method flow diagram in the present invention.
Embodiment:
With reference to Fig. 1, this embodiment is by the following technical solutions: its ultrahigh frequency radio frequency identification (RFID) reader device comprises multiple channel wireless communication module (1) and FPGA realizes read write line (2), multiple channel wireless communication module (1) realizes read write line (2) by serial line interface with FPGA and is connected, and FPGA realize read write line (2) comprise string and data conversion module (3), hop channel scheduling portion (4), data transmit-receive module and host computer interface (5).
Described multiple channel wireless communication module (1) is by CC2530 chip, and crystal oscillating circuit, reset circuit, impedance matching circuit, antenna, plug connector forms.Multiple channel wireless communication module (1) provides plug connector, pluggable, can increase and decrease arbitrarily.Multiple channel wireless communication module (1) realizes read write line (2) by serial ports with FPGA and communicates.By the label data read, send to FPGA by serial ports.By sending to host computer to process further after FPGA process.
Described string data conversion module (3) are responsible for receiving multiple channel wireless communication module (1), string also data conversion module (3) provides data buffer storage queue, data is inserted buffer memory and is supplied to hop channel scheduling portion (4) process.The instruction that host computer is issued by serial RS232 interface by also data conversion module (3) of going here and there, sends multiple channel wireless communication module (1) to, sends multiple label further to.
Described hop channel scheduling portion (4) provides FPGA to realize the hop channel dispatching method of anticollision in read write line (2) and label communication.Initialization FPGA realizes read write line (2), and (1) four the sub-module initialization of multiple channel wireless communication module is identical channel, receives active label data.First to the data markers timestamp with label ID that serial ports receives, then the timestamp of record is added up, when the label data of certain ID add up the reading time exceed certain threshold value time, hop channel scheduling portion (4) sends instruction, label is sent to by N number of submodule in multiple channel wireless communication module (1), pressure is given this label and is changed transmitting channel, hop channel scheduling portion (4) sends modifying of order multiple channel wireless communication module (1) N+1 submodule receive channel simultaneously, the label that channel value launches channel with amendment is set to same channel.
Described data transmit-receive module and host computer interface (5) to be responsible for many label datas of reading, by RJ45 interface or serial ports, sending upper computer software to and being further processed; The instruction that data transmit-receive module and host computer interface (5) are responsible for being issued by RJ45 interface or serial ports reception host computer sends multiple channel wireless communication module (1) to and is handed down to 2.4GHz active label.
With reference to Fig. 2, the workflow of hop channel method is:
Step 201, first initialization read write line.(1) four the sub-module initialization of multiple channel wireless communication module is identical channel, receives active label data.
Wireless signal is converted to cable information by radio frequency unit cc2530 by step 202, wireless channel data, sends to FPGA.Then, by FPGA, first access information is carried out to the check and correction of effectiveness of information, after confirming the effective information of protocol compliant frame format, add timestamp.Timestamp adopts the method for timer count to realize.Timestamp adopts 64 bit data, and low 32 are used for record nanosecond territory, and high 32 are used for record territory second, and the mode logging timestamp gone forward one by one by territory ensures the stability of timer more.Simultaneously because timer clock is 20MHz, and the clock of data identification module be 16 times to clock 153600 Hz of baud rate.Such enable signal then crosses fast clock zone by slow clock zone, and this embodiment have employed the problem that edge synchronization mechanism solves cross clock domain.Timer clock frequency adopts 20MHz, and the cycle is 50ns, and namely the precision of timestamp can reach 50ns.
Step 203, to record timestamp add up, when the label data of certain ID adds up the reading time, when judging whether to exceed certain threshold value, if more than T value, proceed to 204 steps; If more than T value, continue to perform step 202;
If step 204 is more than T value, FPGA sends hop channel instruction, label is sent to by N number of submodule in multiple channel wireless communication module (1), pressure is given this label and is changed transmitting channel, hop channel scheduling portion (4) sends modifying of order multiple channel wireless communication module (1) N+1 submodule receive channel simultaneously, and the label that channel value launches channel with amendment is set to same channel.
The I/O quantity of this embodiment FPGA is many, picking rate is fast, the data of the multiple transmission of the process that can walk abreast, in network, label is coordinated mutually by the distribution of read write line to channel, collision free occurs as far as possible, greatly reduce collision rate, the data of the multiple wireless channel transmission of the process that can walk abreast, can improve read or write speed again simultaneously.
Claims (6)
1. a ultrahigh frequency radio frequency identification (RFID) reader device and hop channel method, it is characterized in that its ultrahigh frequency radio frequency identification (RFID) reader device comprises multiple channel wireless communication module (1) and FPGA realizes read write line (2), multiple channel wireless communication module (1) realizes read write line (2) by serial line interface with FPGA and is connected, and FPGA realize read write line (2) comprise string and data conversion module (3), hop channel scheduling portion (4), data transmit-receive module and host computer interface (5).
2. ultrahigh frequency radio frequency identification (RFID) reader device and a hop channel method, is characterized in that the workflow of hop channel method is:
Step (201), first initialization read write line, (1) four the sub-module initialization of multiple channel wireless communication module is identical channel, receives active label data;
Wireless signal is converted to cable information by radio frequency unit cc2530 by step (202), wireless channel data, sends to FPGA; Then, by FPGA, first access information is carried out to the check and correction of effectiveness of information, after confirming the effective information of protocol compliant frame format, add timestamp, timestamp adopts the method for timer count to realize; Timestamp adopts 64 bit data, and low 32 are used for record nanosecond territory, and high 32 are used for record territory second, and the mode logging timestamp gone forward one by one by territory ensures the stability of timer more; Simultaneously because timer clock is 20MHz, and the clock of data identification module be 16 times to clock 153600 Hz of baud rate;
Step (203), to record timestamp add up, when the label data of certain ID adds up the reading time, when judging whether to exceed certain threshold value, if more than T value, proceed to (204) step; If more than T value, continue to perform step (202);
Step (204) is if more than T value, FPGA sends hop channel instruction, label is sent to by N number of submodule in multiple channel wireless communication module (1), pressure is given this label and is changed transmitting channel, hop channel scheduling portion (4) sends modifying of order multiple channel wireless communication module (1) N+1 submodule receive channel simultaneously, and the label that channel value launches channel with amendment is set to same channel.
3. a kind of ultrahigh frequency radio frequency identification (RFID) reader device according to claim 1 and hop channel method, is characterized in that described multiple channel wireless communication module (1) is by CC2530 chip, crystal oscillating circuit, reset circuit, impedance matching circuit, antenna, plug connector forms.
4. a kind of ultrahigh frequency radio frequency identification (RFID) reader device according to claim 1 and hop channel method, it is characterized in that described string and data conversion module (3) responsible reception multiple channel wireless communication module (1), string also data conversion module (3) provides data buffer storage queue, data are inserted buffer memory and be supplied to hop channel scheduling portion (4) process, the instruction that host computer is issued by serial RS232 interface by also data conversion module (3) of going here and there, send multiple channel wireless communication module (1) to, send multiple label further to.
5. a kind of ultrahigh frequency radio frequency identification (RFID) reader device according to claim 1 and hop channel method, is characterized in that described hop channel scheduling portion (4) provides FPGA to realize the hop channel dispatching method of anticollision in read write line (2) and label communication, initialization FPGA realizes read write line (2), and (1) four the sub-module initialization of multiple channel wireless communication module is identical channel, receives active label data, first to the data markers timestamp with label ID that serial ports receives, then the timestamp of record is added up, when the label data of certain ID add up the reading time exceed certain threshold value time, hop channel scheduling portion (4) sends instruction, label is sent to by N number of submodule in multiple channel wireless communication module (1), pressure is given this label and is changed transmitting channel, hop channel scheduling portion (4) sends modifying of order multiple channel wireless communication module (1) N+1 submodule receive channel simultaneously, the label that channel value launches channel with amendment is set to same channel.
6. a kind of ultrahigh frequency radio frequency identification (RFID) reader device according to claim 1 and hop channel method, it is characterized in that described data transmit-receive module and host computer interface (5) to be responsible for many label datas of reading, by RJ45 interface or serial ports, sending upper computer software to and being further processed; The instruction that data transmit-receive module and host computer interface (5) are responsible for being issued by RJ45 interface or serial ports reception host computer sends multiple channel wireless communication module (1) to and is handed down to 2.4GHz active label.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104866882A (en) * | 2015-06-12 | 2015-08-26 | 安徽朗坤物联网有限公司 | Ultrahigh-frequency RFID reader-writer device and hopping channel method |
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| CN104866882A (en) * | 2015-06-12 | 2015-08-26 | 安徽朗坤物联网有限公司 | Ultrahigh-frequency RFID reader-writer device and hopping channel method |
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