Multipath identification method and system of passive wireless surface acoustic wave devices
A surface acoustic wave device, multi-channel identification technology, applied in electromagnetic radiation induction and other directions, can solve the problems of different signal propagation delays, inability to realize multi-channel reading of surface acoustic wave devices, impossible to synchronize, etc., to achieve flexible application, Solve identification and information reading problems, the effect of large number of devices
Inactive Publication Date: 2016-09-07
PLA UNIV OF SCI & TECH
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Problems solved by technology
However, due to the different signal propagation delays, it is impossible for the reflected signals of each surface acoustic wave device to reach the reader synchronously.
[0005] Therefore, the problem existing in the prior art is that the code division multiple access technology cannot realize the multi-channel reading of the SAW device when the reflected signal is asynchronous
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[0036] like figure 1 As shown, a passive wireless surface acoustic wave device multi-channel identification system of the present invention includes a reader 100 and a plurality of surface acoustic wave devices 200, and the reader 100 includes:
[0037] An inquiry signal sending unit 101, configured to transmit a radio frequency inquiry signal that is phase-modulated by an inquiry code and a carrier;
[0038] The reflected signal receiving unit 102 is configured to receive reflected signals from each surface acoustic wave device, the reflected signal is an electromagnetic wave signal obtained by cross-correlating the query signal and the code of the surface acoustic wave device;
[0039] The pulse signal identification unit 103 is used to determine whether there is a peak pulse in the reflected signal, and if so, there is a surface acoustic wave device matching the query code in the reader's active area;
[0040] The phase information extraction unit 104 is configured to extr...
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The invention discloses a multipath identification method and system of passive wireless surface acoustic wave devices. The method comprises the steps of (11) sending an inquiry signal, in which a reader sends an RF inquiry signal after phase modulation by inquiry codes and carrier waves; (12) receiving reflection signals, in which the reader receives reflection signals of the surface acoustic wave devices; (13) identifying pulse signals, in which the reader determines whether peak pulses exist in the reflection signals, and if yes, the surface acoustic wave device matching the inquiry codes exists in an action area of the reader; and (14) extracting phase information, in which the reader extracts phase information of the pulse signals by demodulation, and further reads information of the surface acoustic wave device matching the inquiry codes. The system comprises the reader (100) and the surface acoustic wave devices (200). According to the method and system, the surface acoustic wave devices can be read in multiple paths via the CDMA technology when the reflection signals are asynchronous.
Description
technical field [0001] The invention belongs to the technical field of surface acoustic wave applications, in particular to a method and system capable of identifying and reading information of a plurality of passive wireless surface acoustic wave devices. Background technique [0002] Surface acoustic wave devices are electronic devices that work based on the propagation characteristics of surface acoustic waves on piezoelectric substrates, including surface acoustic wave sensors, surface acoustic wave tags (transponders), and surface acoustic wave actuators. Since the energy loss of the surface acoustic wave in the process of propagation and conversion is very small, the surface acoustic wave device can directly receive the electromagnetic wave signal through the antenna and convert it into a surface acoustic wave, and can also realize the signal without external power supply. Conversion and transformation, therefore, SAW devices can realize passive operation and wireless ...
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IPC IPC(8): G06K7/10
CPCG06K7/10
Inventor 谢立强邢建春王平王添仙杨启亮王荣浩
Owner PLA UNIV OF SCI & TECH