CN105930755A - Multipath identification method and system of passive wireless surface acoustic wave devices - Google Patents
Multipath identification method and system of passive wireless surface acoustic wave devices Download PDFInfo
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Abstract
本发明公开一种无源无线声表面波器件多路识别方法及系统。方法包括(11)发送问询信号：阅读器发射由问询编码与载波进行相位调制后的射频问询信号；(12)接收反射信号：阅读器接收来自各声表面波器件的反射信号；(13)识别脉冲信号：阅读器判别反射信号中是否存在尖峰脉冲，如是，则阅读器作用区域内存在与问询编码匹配的声表面波器件；(14)提取相位信息：阅读器通过解调，提取脉冲信号的相位信息，从而读取与问询编码匹配的声表面波器件的信息。系统包括一个阅读器(100)和多个声表面波器件(200)。本发明的方法和系统，通过码分多址技术实现反射信号异步时声表面波器件的多路读取。
The invention discloses a multi-channel identification method and system for passive wireless surface acoustic wave devices. The method includes (11) sending an inquiry signal: the reader transmits a radio frequency inquiry signal after the phase modulation of the inquiry code and the carrier; (12) receiving the reflected signal: the reader receives the reflected signal from each surface acoustic wave device; ( 13) Identify the pulse signal: the reader judges 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 action area; (14) extracting phase information: the reader passes through demodulation, The phase information of the pulse signal is extracted, so as to read the information of the surface acoustic wave device that matches the interrogation code. The system includes a reader (100) and a plurality of surface acoustic wave devices (200). The method and system of the present invention realize multi-channel reading of the surface acoustic wave device when the reflection signal is asynchronous through code division multiple access technology.
Description
技术领域technical field
本发明属于声表面波应用技术领域，特别是一种能够对多个无源无线声表面波器件进行识别及信息读取的方法及系统。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.
背景技术Background technique
声表面波器件即基于声表面波在压电基片上的传播特性进行工作的电子器件，它包括声表面波传感器、声表面波标签(应答器)、声表面波执行器等。由于声表面波在传播和转换的过程中损耗的能量很小，使得声表面波器件可通过天线直接接收电磁波信号并转换成声表面波，还可在不需要外部电源供电的情况下实现信号的转换和变换，因此，声表面波器件可实现无源工作和无线传输。声表面波器件除了无源无线的工作特性外，还具有可靠性高、环境适应性强、结构简单、应用灵活等优点，在信息感测、物品识别、信号处理等领域有广泛的应用。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 transmission. In addition to passive and wireless working characteristics, surface acoustic wave devices also have the advantages of high reliability, strong environmental adaptability, simple structure, and flexible application. They are widely used in information sensing, item identification, and signal processing.
无源无线声表面波器件的实际应用系统一般由一个阅读器(问询器)和多个声表面波器件组成。工作时声表面波器件通过天线接收阅读器发射的射频问询信号，并通过梳齿换能器转换成声表面波，声表面波在压电基片上传播，遇到反射栅进行反射后再传到换能器，或直接传到另一组换能器，梳齿换能器将声表面波转换成电信号后通过天线反射回阅读器，阅读器通过对反射信号进行处理实现对声表面波器件的识别和信息读取。The practical application system of passive wireless SAW devices generally consists of a reader (interrogator) and multiple SAW devices. When working, the surface acoustic wave device receives the RF interrogation signal emitted by the reader through the antenna, and converts it into a surface acoustic wave through the comb-tooth transducer. to the transducer, or directly to another group of transducers, the comb-tooth transducer converts the surface acoustic wave into an electrical signal and reflects it back to the reader through the antenna, and the reader realizes the detection of the surface acoustic wave by processing the reflected signal Device identification and information reading.
因无源无线声表面波器件的结构简单，使得声表面波器件与阅读器之间的通信过程中没有复杂的传输媒介访问控制机制，致使多个声表面波器件的反射信号到达阅读器时会互相干扰，从而导致阅读器不能识别和读取器件信息，这就是无源无线声表面波器件的多路识别与多路信息读取问题。目前实际可用的声表面波器件多路识别与读取方法主要包括时分复用、频分复用和码分多址技术。时分复用和频分复用技术比较成熟，但受到器件尺寸和频谱资源的限制，使得阅读器可同时读取的声表面波器件的数量较少。码分多址技术能够应用的前提是正交的多路信号具有同步性，然后进行相关运算来对多路信号进行解析。然而由于信号传播延时不同，使得各声表面波器件的反射信号到达阅读器时不可能同步。Due to the simple structure of the passive wireless surface acoustic wave device, there is no complicated transmission medium access control mechanism in the communication process between the surface acoustic wave device and the reader, so that when the reflected signals of multiple surface acoustic wave devices reach the reader, the Interference with each other makes the reader unable to identify and read device information. This is the problem of multi-channel identification and multi-channel information reading of passive wireless surface acoustic wave devices. Currently available multiple identification and reading methods for surface acoustic wave devices mainly include time division multiplexing, frequency division multiplexing and code division multiple access technologies. Time-division multiplexing and frequency-division multiplexing technologies are relatively mature, but limited by device size and spectrum resources, the number of SAW devices that can be read by the reader at the same time is small. The premise that code division multiple access technology can be applied is that the orthogonal multi-channel signals are synchronized, and then the correlation operation is performed to analyze the multi-channel signals. However, due to the different signal propagation delays, it is impossible for the reflected signals of each SAW device to reach the reader synchronously.
因此，现有技术存在的问题是：码分多址技术无法实现反射信号异步时声表面波器件的多路读取。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 signals are asynchronous.
发明内容Contents of the invention
本发明的目的在于提供一种无源无线声表面波器件多路识别方法，通过码分多址技术实现反射信号异步时声表面波器件的多路读取。The purpose of the present invention is to provide a multi-channel identification method for passive wireless surface acoustic wave devices, which realizes multi-channel reading of surface acoustic wave devices when reflection signals are asynchronous through code division multiple access technology.
本发明的另一目的在于提供一种实现上述无源无线声表面波器件多路识别方法的系统。Another object of the present invention is to provide a system for implementing the above-mentioned multi-channel identification method for passive wireless surface acoustic wave devices.
实现本发明目的的一种技术方案为：A kind of technical scheme that realizes the object of the present invention is:
一种无源无线声表面波器件多路识别方法，适用于一个阅读器对多个声表面波器件的识别和信息读取，包括如下步骤：A multi-channel identification method for passive wireless surface acoustic wave devices, which is suitable for identification and information reading of multiple surface acoustic wave devices by a reader, comprising the following steps:
(11)发送问询信号：阅读器发射由问询编码与载波进行相位调制后的射频问询信号；(11) Send an inquiry signal: the reader transmits a radio frequency inquiry signal that is phase-modulated by the inquiry code and the carrier;
(12)接收反射信号：阅读器接收来自各声表面波器件的反射信号，该反射信号为问询信号与声表面波器件编码进行互相关运算后的电磁波信号；(12) Receiving reflected signals: the reader receives reflected signals from each surface acoustic wave device, which is an electromagnetic wave signal after cross-correlation calculation between the inquiry signal and the code of the surface acoustic wave device;
(13)识别脉冲信号：阅读器判别反射信号中是否存在尖峰脉冲，如是，则阅读器作用区域内存在与问询编码匹配的声表面波器件；(13) Identify the pulse signal: the reader judges whether there is a peak pulse in the reflected signal, and if so, there is a surface acoustic wave device that matches the query code in the reader's active area;
(14)提取相位信息：阅读器通过解调，提取脉冲信号的相位信息，从而读取与问询编码匹配的声表面波器件的信息。(14) Extract phase information: the reader extracts the phase information of the pulse signal through demodulation, thereby reading the information of the surface acoustic wave device that matches the query code.
实现本发明目的的另一种技术方案为：Another kind of technical scheme that realizes the object of the present invention is:
一种无源无线声表面波器件多路识别方法，适用于多个声表面波器件对同一个阅读器的响应，包括如下步骤：A multi-channel identification method for passive wireless surface acoustic wave devices, which is suitable for the response of multiple surface acoustic wave devices to the same reader, comprising the following steps:
(21)接收问询信号：声表面波器件接收由问询编码与载波相位调制而成的来自阅读器的射频问询信号；(21) Receiving inquiry signal: the surface acoustic wave device receives the radio frequency inquiry signal from the reader modulated by inquiry code and carrier phase;
(22)进行相关运算：声表面波器件利用片上相关器实现问询信号与自身编码的互相关运算；(22) Correlation calculation: the surface acoustic wave device uses the on-chip correlator to realize the cross-correlation calculation between the interrogation signal and its own code;
(23)发射反射信号：声表面波器件将问询信号与自身编码的互相关运算结果转换为电磁波信号并发射出去，供阅读器识别和信息提取。(23) Transmit reflection signal: The surface acoustic wave device converts the cross-correlation calculation result of the inquiry signal and its own code into an electromagnetic wave signal and emits it for reader identification and information extraction.
实现本发明另一目的的技术方案为：The technical scheme that realizes another object of the present invention is:
一种无源无线声表面波器件多路识别系统，包括一个阅读器和多个声表面波器件，所述阅读器包括：A passive wireless surface acoustic wave device multi-channel identification system includes a reader and a plurality of surface acoustic wave devices, the reader includes:
问询信号发送单元(101)，用于发射由问询编码与载波进行相位调制后的射频问询信号；An inquiry signal sending unit (101), configured to transmit a radio frequency inquiry signal after the phase modulation of the inquiry code and the carrier;
反射信号接收单元(102)，用于接收来自各声表面波器件的反射信号，该反射信号为问询信号与声表面波器件编码进行互相关运算后的电磁波信号；A reflected signal receiving unit (102), configured to receive reflected signals from each surface acoustic wave device, where the reflected signal is an electromagnetic wave signal obtained by cross-correlating the interrogation signal and the code of the surface acoustic wave device;
脉冲信号识别单元(103)，用于判别反射信号中是否存在尖峰脉冲，如是，则阅读器作用区域内存在与问询编码匹配的声表面波器件；A pulse signal identification unit (103), 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;
相位信息提取单元(104)，用于通过解调，提取脉冲信号的相位信息，从而读取与问询编码匹配的声表面波器件的信息。The phase information extraction unit (104) is used to extract the phase information of the pulse signal through demodulation, so as to read the information of the surface acoustic wave device matching the query code.
本发明与现有技术相比，其显著优点为：Compared with the prior art, the present invention has the remarkable advantages of:
本发明将码分多址技术的相关运算由阅读器端转移到声表面波器件端上，从而解决了各器件反射信号的异步性导致不能正交解码的问题。因此，基于码分多址技术实现了反射信号异步时声表面波器件的多路读取。The invention transfers the correlation operation of the code division multiple access technology from the reader end to the surface acoustic wave device end, thereby solving the problem that the asynchrony of the reflection signals of each device cannot lead to orthogonal decoding. Therefore, based on code division multiple access technology, the multi-channel reading of SAW devices is realized when the reflected signals are asynchronous.
本发明所述该方法之片上相关器实际是多组叉指换能器的联接，器件结构简单成本低易于实现。The on-chip correlator of the method described in the present invention is actually a connection of multiple groups of interdigital transducers, and the device structure is simple, low in cost and easy to realize.
本发明所述方法的器件编码丰富，单个系统包含的器件数量大，应用灵活。The device coding of the method of the invention is rich, the number of devices contained in a single system is large, and the application is flexible.
综上，本发明所述的方法可有效地解决大量无源无线声表面波器件同时工作的识别和信息读取问题，在射频识别和分布式监测等领域具有巨大的应用潜力。In summary, the method of the present invention can effectively solve the problem of identification and information reading of a large number of passive wireless surface acoustic wave devices working simultaneously, and has great application potential in the fields of radio frequency identification and distributed monitoring.
附图说明Description of drawings
图1为本发明无源无线声表面波器件多路识别系统结构原理图。Fig. 1 is a schematic structural diagram of a multi-channel identification system for a passive wireless surface acoustic wave device of the present invention.
图2为基于声表面波相关器的双端口器件示意图。Fig. 2 is a schematic diagram of a two-port device based on a surface acoustic wave correlator.
图3为基于声表面波相关器的单端口器件示意图。Fig. 3 is a schematic diagram of a single-port device based on a surface acoustic wave correlator.
图4为本发明无源无线声表面波器件多路识别方法的工作原理图。Fig. 4 is a working principle diagram of the multi-channel identification method for passive wireless surface acoustic wave devices of the present invention.
图中，阅读器100，问询信号发送单元101，反射信号接收单元102，脉冲信号识别单元103，相位信息提取单元104，阅读器天线105，In the figure, a reader 100, an inquiry signal sending unit 101, a reflected signal receiving unit 102, a pulse signal identifying unit 103, a phase information extracting unit 104, a reader antenna 105,
声表面波器件200，问询信号接收单元201，信号相关运算单元202，反射信号发射单元203，压电基片204，叉指换能器205，相关器206，汇流条207，器件天线208，接收天线209，发送天线210，器件编码211，问询信号转换的声表面波信号212，互相关信号转换的声表面波信号213。Surface acoustic wave device 200, inquiry signal receiving unit 201, signal correlation operation unit 202, reflected signal transmitting unit 203, piezoelectric substrate 204, interdigital transducer 205, correlator 206, bus bar 207, device antenna 208, A receiving antenna 209, a transmitting antenna 210, a device code 211, a surface acoustic wave signal 212 converted from an inquiry signal, and a surface acoustic wave signal 213 converted from a cross-correlation signal.
具体实施方式detailed description
如图1所示，本发明一种无源无线声表面波器件多路识别系统，包括一个阅读器100和多个声表面波器件200，所述阅读器100包括：As shown in Fig. 1, a passive wireless surface acoustic wave device multiple identification system of the present invention includes a reader 100 and a plurality of surface acoustic wave devices 200, and the reader 100 includes:
问询信号发送单元101，用于发射由问询编码与载波进行相位调制后的射频问询信号；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;
反射信号接收单元102，用于接收来自各声表面波器件的反射信号，该反射信号为问询信号与声表面波器件编码进行互相关运算后的电磁波信号；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;
脉冲信号识别单元103，用于判别反射信号中是否存在尖峰脉冲，如是，则阅读器作用区域内存在与问询编码匹配的声表面波器件；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;
相位信息提取单元104，用于通过解调，提取脉冲信号的相位信息，从而读取与问询编码匹配的声表面波器件的信息。The phase information extraction unit 104 is configured to extract the phase information of the pulse signal through demodulation, so as to read the information of the surface acoustic wave device that matches the query code.
所述声表面波器件200包括：The surface acoustic wave device 200 includes:
问询信号接收单元201，用于接收来自阅读器100的射频问询信号；An inquiry signal receiving unit 201, configured to receive a radio frequency inquiry signal from the reader 100;
信号相关运算单元202，用于实现问询信号与自身编码的互相关运算；A signal correlation operation unit 202, configured to implement a cross-correlation operation between the inquiry signal and its own code;
反射信号发射单元203，用于将问询信号与自身编码的互相关运算结果转换为电磁波信号并发射出去，供阅读器识别和信息提取。The reflected signal transmitting unit 203 is used to convert the cross-correlation calculation result of the interrogation signal and its own code into an electromagnetic wave signal and transmit it for identification and information extraction by the reader.
所述声表面波器件200的信号相关运算单元202包括由多组不同极性的叉指换能器并联组成的片上相关器206，所述片上相关器206中叉指换能器的联接方式决定该声表面波器件的编码。The signal correlation operation unit 202 of the surface acoustic wave device 200 includes an on-chip correlator 206 composed of multiple sets of interdigital transducers of different polarities connected in parallel, and the connection mode of the interdigital transducers in the on-chip correlator 206 determines Encoding of the SAW device.
声表面波器件200一般为压电基片204上镀制有叉指换能器205的电子器件。工作时，阅读器100通过天线105发射射频问询信号，各器件通过天线208接收问询信号后由叉指换能器205转换为声表面波信号并在基片204表面传播。声表面波在传播过程中遇见叉指换能器205又转换为电磁信号并经天线208发射出去作为反射信号，阅读器100收到各器件200的反射信号后进行信号分析处理，从而实现对各器件200的识别和信息读取。The surface acoustic wave device 200 is generally an electronic device with an interdigital transducer 205 plated on a piezoelectric substrate 204 . During operation, the reader 100 transmits a radio frequency interrogation signal through the antenna 105 , each device receives the interrogation signal through the antenna 208 and converts it into a surface acoustic wave signal by the IDT 205 and propagates on the surface of the substrate 204 . The surface acoustic wave encounters the interdigital transducer 205 during the propagation process and converts it into an electromagnetic signal and transmits it as a reflected signal through the antenna 208. After receiving the reflected signal of each device 200, the reader 100 performs signal analysis and processing, thereby realizing the detection of each Identification of device 200 and information reading.
由于在阅读器问询信号覆盖范围内的所有声表面波器件均反射信号，阅读器接收到的是各反射信号的异步叠加，使得各器件反射信号之间产生了强烈的干扰，从而导致阅读器无法对各器件进行识别和信息读取。为了解决反射信号之间的相互干扰问题，本发明采用声表面波相关器技术，使问询信号与器件编码在器件端做互相关运算，并将运算结果以反射信号形式反馈给阅读器。由于只有与问询编码匹配的器件才会产生明显的尖峰脉冲，因此阅读器能够对匹配的声表面波器件进行识别和信息读取。当阅读器将编码集内所有编码都以问询信号的形式逐一发送，则可实现对系统内所有器件的识别和信息读取。Since all surface acoustic wave devices within the coverage of the reader's query signal reflect signals, what the reader receives is the asynchronous superposition of the reflected signals, which causes strong interference between the reflected signals of each device, resulting in the reader The identification and information reading of each device cannot be performed. In order to solve the problem of mutual interference between reflected signals, the present invention adopts surface acoustic wave correlator technology to perform cross-correlation calculations on the interrogation signal and device codes at the device end, and feed back the calculation results to the reader in the form of reflected signals. Since only the devices that match the interrogation code will produce obvious spikes, the reader can identify and read information on the matched SAW devices. When the reader sends all the codes in the code set one by one in the form of inquiry signals, it can realize the identification and information reading of all devices in the system.
声表面波器件的一种实施例示意图如图2所示，该器件主要由基片204，叉指换能器205、相关器206、接收天线209、发送天线210组成。叉指换能器205用于电信号与声表面波信号之间的转换。相关器206是由多组不同极性的叉指换能器并联组成，同极性表示编码“+1”，异极性表示编码“-1”，则器件编码211由206中各组叉指换能器的联接形式确定，每组叉指换能器的周期数为器件编码211的码片长度，从而可实现器件编码与输入信号的互相关运算。工作时天线209接收调制有问询编码的问询信号并传递给叉指换能器205，205将电信号转换成声表面波信号212并沿基片传播，声表面波信号212输入相关器206与器件编码211进行互相关运算，运算结果以电信号形式通过汇流条207传递到天线210并发射出去，因此该器件为双端口器件。A schematic diagram of an embodiment of a surface acoustic wave device is shown in FIG. 2 . The device is mainly composed of a substrate 204 , an interdigital transducer 205 , a correlator 206 , a receiving antenna 209 , and a transmitting antenna 210 . The interdigital transducer 205 is used for conversion between electrical signals and surface acoustic wave signals. The correlator 206 is composed of multiple sets of interdigital transducers with different polarities connected in parallel. The same polarity means code "+1", and the opposite polarity means code "-1". The connection form of the transducers is determined, and the cycle number of each group of interdigital transducers is the chip length of the device code 211, so that the cross-correlation operation between the device code and the input signal can be realized. During operation, the antenna 209 receives the interrogation signal modulated with the interrogation code and transmits it to the interdigital transducer 205, which converts the electrical signal into a surface acoustic wave signal 212 and propagates along the substrate, and the surface acoustic wave signal 212 is input to the correlator 206 The cross-correlation operation is performed with the device code 211, and the operation result is transmitted to the antenna 210 through the bus bar 207 in the form of an electrical signal and emitted, so the device is a dual-port device.
声表面波器件的另一种实施例示意图如图3所示，该器件与上述双端口器件类似，主要由基片204，叉指换能器205、相关器206和天线208组成，不同之处在于换能器205与相关器206通过汇流条207并联在一起，并与天线208相连，天线208既为接收天线又为发射天线，因此该器件为单端口器件。工作时天线208接收调制有问询编码的问询信号并通过汇流条207分别传递给叉指换能器205和相关器206。在205一侧，换能器205将电信号转换成声表面波信号212并沿基片传播，声表面波信号212输入相关器206与器件编码211进行互相关运算，运算结果以电信号形式流入汇流条207。在206一侧，相关器206实现输入信号与器件编码211之间的互相关运算，运算结果转换为声表面波213并沿基片传播，信号213到达换能器205后转换成为电信号并流入汇流条207。由于两侧信号的变换结果一致，205和206两侧汇入汇流条207的信号可以实现同相叠加并通过天线208发射出去。Another embodiment schematic diagram of surface acoustic wave device is shown in Figure 3, and this device is similar to above-mentioned two-port device, mainly is made up of substrate 204, interdigital transducer 205, correlator 206 and antenna 208, difference The transducer 205 and the correlator 206 are connected in parallel through the bus bar 207 and connected to the antenna 208. The antenna 208 is both a receiving antenna and a transmitting antenna, so the device is a single-port device. During operation, the antenna 208 receives the interrogation signal modulated with the interrogation code and transmits it to the interdigital transducer 205 and the correlator 206 respectively through the bus bar 207 . On the 205 side, the transducer 205 converts the electrical signal into a surface acoustic wave signal 212 and propagates along the substrate. The surface acoustic wave signal 212 is input into the correlator 206 and the device code 211 for cross-correlation calculation, and the calculation result flows into the bus bar 207 . On the 206 side, the correlator 206 realizes the cross-correlation operation between the input signal and the device code 211, and the operation result is converted into a surface acoustic wave 213 and propagates along the substrate. After the signal 213 reaches the transducer 205, it is converted into an electrical signal and flows into the bus bar 207 . Since the transformation results of the signals on both sides are consistent, the signals fed into the bus bar 207 on both sides of 205 and 206 can be superimposed in phase and transmitted through the antenna 208 .
如图4所示，本发明无源无线声表面波器件多路识别方法，适用于一个阅读器100对多个声表面波器件200的识别和信息读取，包括如下步骤：As shown in FIG. 4, the multi-channel identification method for passive wireless SAW devices of the present invention is applicable to the identification and information reading of multiple SAW devices 200 by one reader 100, including the following steps:
(11)发送问询信号：阅读器发射由问询编码与载波进行相位调制后的射频问询信号；(11) Send an inquiry signal: the reader transmits a radio frequency inquiry signal that is phase-modulated by the inquiry code and the carrier;
所述问询编码为二进制编码。The query code is a binary code.
(12)接收反射信号：阅读器接收来自各声表面波器件的反射信号，该反射信号为问询信号与声表面波器件编码进行互相关运算后的电磁波信号；(12) Receiving reflected signals: the reader receives reflected signals from each surface acoustic wave device, which is an electromagnetic wave signal after cross-correlation calculation between the inquiry signal and the code of the surface acoustic wave device;
声表面波器件编码为二进制编码。SAW devices are coded as binary codes.
所述(12)接收反射信号步骤中的互相关运算为：The cross-correlation operation in the described (12) receiving reflected signal step is:
当问询信号中的问询编码与声表面波器件编码不一致时，反射信号呈现无序状态，表现为噪声；When the query code in the query signal is inconsistent with the code of the surface acoustic wave device, the reflected signal is in a disordered state, manifested as noise;
当问询信号中的问询编码与声表面波器件编码一致时，反射信号呈现一尖峰脉冲。When the query code in the query signal is consistent with the code of the surface acoustic wave device, the reflected signal presents a sharp pulse.
(13)识别脉冲信号：阅读器判别反射信号中是否存在尖峰脉冲，如是，则阅读器作用区域内存在与问询编码匹配的声表面波器件；(13) Identify the pulse signal: the reader judges whether there is a peak pulse in the reflected signal, and if so, there is a surface acoustic wave device that matches the query code in the reader's active area;
(14)提取相位信息：阅读器通过解调，提取脉冲信号的相位信息，从而读取与问询编码匹配的声表面波器件的信息。(14) Extract phase information: the reader extracts the phase information of the pulse signal through demodulation, thereby reading the information of the surface acoustic wave device that matches the query code.
如图4所示，本发明无源无线声表面波器件多路识别方法，适用于多个声表面波器件对同一个阅读器的响应，包括如下步骤：As shown in Figure 4, the multi-channel identification method for passive wireless surface acoustic wave devices of the present invention is applicable to the response of multiple surface acoustic wave devices to the same reader, including the following steps:
(21)接收问询信号：声表面波器件接收由问询编码与载波相位调制而成的来自阅读器的射频问询信号；(21) Receiving inquiry signal: the surface acoustic wave device receives the radio frequency inquiry signal from the reader modulated by inquiry code and carrier phase;
(22)进行相关运算：声表面波器件利用片上相关器实现问询信号与自身编码的互相关运算；(22) Correlation calculation: the surface acoustic wave device uses the on-chip correlator to realize the cross-correlation calculation between the interrogation signal and its own code;
(23)发射反射信号：声表面波器件将问询信号与自身编码的互相关运算结果转换为电磁波信号并发射出去，供阅读器识别和信息提取。(23) Transmit reflection signal: The surface acoustic wave device converts the cross-correlation calculation result of the inquiry signal and its own code into an electromagnetic wave signal and emits it for reader identification and information extraction.
问询编码为二进制编码，声表面波器件编码为二进制编码。The query code is a binary code, and the SAW device code is a binary code.
所述(22)进行相关运算步骤中的互相关运算为：The cross-correlation operation in the (22) carrying out the correlation operation step is:
当问询信号中的问询编码与声表面波器件编码不一致时，反射信号呈现无序状态，表现为噪声；When the query code in the query signal is inconsistent with the code of the surface acoustic wave device, the reflected signal is in a disordered state, manifested as noise;
当问询信号中的问询编码与声表面波器件编码一致时，反射信号呈现一尖峰脉冲。When the query code in the query signal is consistent with the code of the surface acoustic wave device, the reflected signal presents a sharp pulse.
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