Wireless passive radio frequency sensing system anti-collision data-transmission method

Abstract

The invention discloses an anti-collision data transmission method for a wireless passive radio-frequency sensing system. The wireless passive radio-frequency sensing system mainly comprises a single reader and a plurality of sensor nodes, wherein node response adopts the mode of single-bit response of address codes. Compared with a binary tree and a corrective method thereof, the nodes do not need to transmit a large quantity of address codes, so that the error rate of the address codes can be effectively reduced; and the single-bit response mode adopts a breakpoint-based method, not only completes identification of all the nodes within a cycle but also can read the sensor measurement value when simultaneously inquiring the nodes, realizes the function of completion of reading of measurement values of all the sensor nodes and detection of address collision through a single query instruction, and has high efficiency. The anti-collision data transmission method for the wireless passive radio-frequency sensing system reduces the response digit of a responder and the error rate, and realizes the function of completion of reading of the measurement values of all the sensor nodes and detection of address collision through the single query instruction.

Description

technical field [0001] The invention relates to wireless passive sensing technology, in particular to an anti-collision data transmission method of a wireless passive radio frequency sensing system. Background technique [0002] Research on wireless passive sensors is still in its infancy and has considerable potential. Although the wireless active sensing technology is relatively mature, due to the limited battery power and its life is greatly affected by the environment, the passivation of sensor tags is an ideal development trend of wireless sensor systems and has begun to appear. [0003] At present, the products and research of wireless passive sensors are mainly surface acoustic wave (SAW) sensors. The wireless passive SAW sensor works on the principle that when the SAW propagates on the surface of the piezoelectric substrate, the change of the physical characteristics of the piezoelectric substrate surface causes the change of the propagation characteristics of the S...

AI Technical Summary

Problems solved by technology

However, the randomness of the ALOHA method is large. When a large number of tags coexist, frame collisions are serious, causing a sharp deterioration in performance, and the theoretical performance is not as good as the binary tree method.

Binary tree methods include dynamic binary methods, backward binary tree search methods, and other forms of optimized binary tree methods, but the binary tree method has a long response time sequence and is prone to error codes.

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