Cross-platform broadband RFID signal test verification system

Abstract

The utility model discloses a cross-platform broadband RFID signal test verification system, which comprises a vector signal source, a spectrum analyzer, and a system control card, a digital signal processing card, an intermediate frequency signal analog-to-digital conversion card and a baseband signal analog-to-digital conversion card which are connected to a high-speed instrument bus port one by one, the signal receiving and transmitting port of the digital signal processing card is further connected with an intermediate frequency signal analog-to-digital conversion card and a baseband signal digital-to-analog conversion card, and the intermediate frequency signal output port of the spectrum analyzer is connected with the intermediate frequency signal analog-to-digital conversion card through a cable. A baseband signal input port of the vector signal source is connected to the baseband signal digital-to-analog conversion card through a cable. The verification system disclosed by the utility model combines high bandwidth and flexibility of a modularized instrument platform and high frequency and high precision of an independent instrument platform, and can achieve RFID signal processing function and performance which are difficult to realize by a single platform signal test verification system.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency identification testing, in particular to a cross-platform broadband RFID signal testing and verification system. Background Art

[0002] With the development of RFID technology, people have an increasing demand for high-speed short-distance communication. The emergence of broadband RFID technology has achieved high-bandwidth and high-speed data transmission within a short distance. Its modulation method and coding technology have characteristics that make it have wider bandwidth, higher data rate, and higher security that traditional RFID technology does not have. Broadband RFID technology has solved major transmission problems that have plagued traditional RFID technology for many years. It has the advantages of insensitivity to channel fading, low power spectrum density of transmitted signals, low interception capability, and high positioning accuracy. However, due to its wider bandwidth and higher data rate, it also brings great challenges to the experimental verification of broadband RFID signals.

[0003] Traditional RFID signal test and verification systems are mainly built by combining several independent instruments or customized by modular instruments of software radio. However, independent instruments often have restrictive conditions such as fixed functions and limited bandwidth, which make it difficult to fully meet the test requirements of broadband RFID signals. Modular instruments often have problems such as low precision technical indicators and low RF frequency range, which limit the coverage of broadband RFID signal tests. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a cross-platform broadband RFID signal testing and verification system.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A cross-platform broadband RFID signal test and verification system comprises a vector signal source, a spectrum analyzer, and a system control card, a digital signal processing card, an intermediate frequency signal analog-to-digital conversion card, and a baseband signal digital-to-analog conversion card connected one by one to a high-speed instrument bus port; the signal transceiver port of the digital signal processing card is also connected to the intermediate frequency signal analog-to-digital conversion card and the baseband signal digital-to-analog conversion card respectively, the intermediate frequency signal output port of the spectrum analyzer is connected to the intermediate frequency signal analog-to-digital conversion card through a cable, and the baseband signal input port of the vector signal source is connected to the baseband signal digital-to-analog conversion card through a cable; when receiving a broadband RFID signal, the spectrum analyzer first performs power conversion and frequency conversion on a radio frequency signal to obtain an intermediate frequency signal, then the intermediate frequency signal analog-to-digital conversion card performs analog-to-digital conversion on the intermediate frequency signal, and finally the digital signal processing card analyzes the digital signal; when transmitting a broadband RFID signal, the digital signal processing card first generates a digital signal to be transmitted, then the baseband signal digital-to-analog conversion card performs digital-to-analog conversion on the digital signal, and finally the vector signal source performs power conversion and frequency conversion on the baseband signal to obtain a radio frequency signal.

[0007] The above system uses NIPXIe-8861 as the control card, NI PXIe-7976R as the digital signal processing card, NIPXIe-5624 as the intermediate frequency signal analog-to-digital conversion card, NIPXIe-5820 as the baseband signal digital-to-analog conversion card, PXIe bus as the high-speed instrument bus, Keysight N9040B as the spectrum analyzer, and RS SMW200A as the vector signal source.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] The verification system disclosed by the utility model combines the high bandwidth and flexibility of a modular instrument platform with the high frequency and high precision of an independent instrument platform, and can achieve RFID signal processing functions and performance that are difficult to achieve with a single-platform signal test verification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a block diagram of the composition principle of the utility model;

[0011] Figure 2 It is a flowchart of the utility model receiving signals;

[0012] Figure 3 It is a flowchart of the signal transmission of the utility model. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0014] Example

[0015] like Figure 1-3 A cross-platform broadband RFID signal test and verification system is shown, comprising a system control card, a digital signal processing card, an intermediate frequency signal analog-to-digital conversion card, a baseband signal digital-to-analog conversion card, a high-speed instrument bus, a spectrum analyzer and a vector signal source.

[0016] The above-mentioned system control card adopts NIPXIe-8861, has a Xeon E3-1515M high-performance CPU, supports PXIe high-speed instrument bus, and has multiple communication ports such as network port, serial port, USB, etc., which are used to realize coordinated control of the test verification system. Specifically, the system control card is connected to the digital signal processing card, the intermediate frequency signal analog-to-digital conversion card, and the baseband signal digital-to-analog conversion card through the PXIe high-speed instrument bus, and sends configuration parameters and control instructions to each board card, and receives status parameters and test data sent by each board card. At the same time, the system control card is also connected to the spectrum analyzer and vector signal source through the network port communication port, and sends configuration parameters and control instructions to each instrument, and receives status parameters and test data sent by each instrument.

[0017] The above-mentioned digital signal processing card adopts NIPXIe-7976R, has Kintex K41T high-performance FPGA, supports digital frequency conversion, signal extraction, signal interpolation, signal filtering and other processing functions, and is used to realize the analysis and generation of digital signals. Specifically, the digital signal processing card is connected to the system control card, the intermediate frequency signal analog-to-digital conversion card, and the baseband signal digital-to-analog conversion card through the PXIe high-speed instrument bus, and receives the digital intermediate frequency signal sent by the intermediate frequency signal analog-to-digital conversion card, and sends the digital baseband signal to the baseband signal digital-to-analog conversion card.

[0018] The above-mentioned intermediate frequency signal analog-to-digital conversion card adopts NIPXIe-5624, which has a 2GS / s high-speed ADC, supports high-speed analog-to-digital conversion of broadband RFID signals, and is used to realize signal acquisition in the receiving process. Specifically, the intermediate frequency signal analog-to-digital conversion card is connected to the system control card and the digital signal processing card through the PXIe high-speed instrument bus, and sends a digital intermediate frequency signal to the digital signal processing card. At the same time, the intermediate frequency signal analog-to-digital conversion card is also connected to the spectrum analyzer through the intermediate frequency signal output port and cable, and receives the analog intermediate frequency signal sent by the spectrum analyzer.

[0019] The above-mentioned baseband signal digital-to-analog conversion card adopts NIPXIe-5820, which has a 1.25GS / s high-speed DAC, supports high-speed digital-to-analog conversion of broadband RFID signals, and is used to realize signal generation in the transmission process. Specifically, the baseband signal digital-to-analog conversion card is connected to the system control card and the digital signal processing card through the PXIe high-speed instrument bus, and receives the digital baseband signal sent by the digital signal processing card. At the same time, the baseband signal digital-to-analog conversion card is also connected to the vector signal source through the MMPX signal port and cable, and sends analog baseband signals to the vector signal source.

[0020] The above-mentioned high-speed instrument bus adopts PXIe bus, has multiple data exchange, clock synchronization and trigger channels, and can be connected to each board through the bus port. Specifically, the high-speed instrument bus supports the exchange of parameters, instructions and data between the system control card and each board, supports the intermediate frequency signal analog-to-digital conversion card to send digital intermediate frequency signals to the digital signal processing card, and supports the digital signal processing card to send digital baseband signals to the baseband signal digital-to-analog conversion card.

[0021] The above spectrum analyzer adopts Keysight N9040B, which has a high frequency of up to 44GHz and a high-precision broadband RFID signal demodulation circuit, supports power conversion and frequency conversion of radio frequency signals, and outputs analog intermediate frequency signals, and is used to realize the conversion from radio frequency signals to intermediate frequency signals in the receiving process. In this embodiment, the spectrum analyzer does not use a built-in signal acquisition circuit, but connects the spectrum analyzer to the intermediate frequency signal analog-to-digital conversion card through the intermediate frequency signal output port and cable, and sends an analog intermediate frequency signal to the intermediate frequency signal analog-to-digital conversion card.

[0022] The above-mentioned vector signal source adopts RS SMW200A, which has a high frequency of up to 44GHz and a high-precision broadband RFID signal modulation circuit, supports power conversion and frequency conversion of radio frequency signals, and the input of analog baseband signals, and is used to realize the conversion from baseband signals to radio frequency signals in the transmission process. Specifically, in this embodiment, the vector signal source does not use a built-in signal generating circuit, but connects the vector signal source to a baseband signal digital-to-analog conversion card through a baseband signal port and a cable, and receives the analog baseband signal sent by the baseband signal digital-to-analog conversion card.

[0023] The cross-platform broadband RFID signal testing and verification system disclosed by the utility model, when receiving broadband RFID signals, firstly performs power conversion and frequency conversion on the radio frequency signal by a spectrum analyzer to obtain an intermediate frequency signal, then performs analog-to-digital conversion on the intermediate frequency signal by an intermediate frequency signal analog-to-digital conversion card, and finally analyzes the digital signal by a digital signal processing card; when transmitting broadband RFID signals, firstly generates a digital signal to be transmitted by a digital signal processing card, then performs digital-to-analog conversion on the digital signal by a baseband signal digital-to-analog conversion card, and finally performs power conversion and frequency conversion on the baseband signal by a vector signal source to obtain a radio frequency signal.

[0024] In summary, the cross-platform broadband RFID signal test and verification system disclosed in the utility model combines the high bandwidth and flexibility of a modular instrument platform with the high frequency and high precision of an independent instrument platform, and can achieve RFID signal processing functions and performance that are difficult to achieve with a single platform signal test and verification system.

[0025] Of course, the present invention may have many other implementation modes. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A cross-platform broadband RFID signal testing and verification system, characterized in that: It includes a vector signal source, a spectrum analyzer, and a system control card, a digital signal processing card, an intermediate frequency signal analog-to-digital conversion card, and a baseband signal digital-to-analog conversion card connected to the high-speed instrument bus port one by one; The signal transceiver ports of the digital signal processing card are also connected to the intermediate frequency signal analog-to-digital conversion card and the baseband signal digital-to-analog conversion card respectively. The intermediate frequency signal output port of the spectrum analyzer is connected to the intermediate frequency signal analog-to-digital conversion card via a cable, and the baseband signal input port of the vector signal source is connected to the baseband signal digital-to-analog conversion card via a cable.

2. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The system control card adopts NIPXIe-8861.

3. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The digital signal processing card adopts NIPXIe-7976R.

4. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The intermediate frequency signal analog-to-digital conversion card adopts NIPXIe-5624.

5. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The baseband signal digital-to-analog conversion card adopts NIPXIe-5820.

6. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The high-speed instrument bus adopts PXIe bus.

7. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The spectrum analyzer used is Keysight N9040B.

8. The cross-platform broadband RFID signal testing and verification system according to claim 1, characterized in that: The vector signal source adopts RS SMW200A.

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