CN102412914B - PXI bus-based radio frequency real-time measurement vector analysis plug-in structural module - Google Patents

Abstract

The invention discloses a PXI bus-based radio frequency real-time measurement vector analysis plug-in structural module, which comprises a PXI interface, a medium-frequency signal processing circuit (1), an analog to digital conversion circuit (2), a receiver circuit (3), a frequency synthesizer circuit (4) and an external plug-in card E which are combined into an integral modular structure. Quick real-time measurement and control such as real-time high-speed information process, real-time calibration and correction, system self-check, fault diagnosis and the like are provided simultaneously while radio-frequency spectrum real-time measurement, vector signal analysis, multi-display section and data processing functions are realized with an integral module design method by using an FPGA (Field Programmable Gate Array) developing tool according to an upper layer software platform and a bottom layer real-time measurement and control and data analysis and processing part; and the module has the characteristics of reasonable design, compact structure, ordered layout, skillful installation, convenience for using, reliable work and the like.

Description

Radio frequency based on PXI bus is measured vector analysis card insertion type structure module in real time

Technical field

The present invention relates to a kind of real-time measurement vector analysis module, particularly a kind of radio frequency based on PXI bus is measured vector analysis card insertion type structure module in real time.

Background technology

Since PXI bussing technique comes out, the Auto-Test System based on PXI bus is widely used and development rapidly.Such as:

The 114th page of the < < electronic design technology > > that publish of 10 phases in 2002 introduces the PXI-5660 VSA that the up-to-date release of LiaoNI company is measured the radiofrequency signal of 9kHz to 2.7GHz.The digital low-converter that this instrument comprises a 2.7GHz, IF digitizer and for the spectrum measurement instrument (SMT) of LabVIEW and LabWindow/CVI.This analyzer is done spectrum measurement radiofrequency signal is down-converted to intermediate frequency, by frequency overlapped-resistable filter, at intermediate frequency, carries out digital sample.The digital signal of sampling by digital quadrature decomposition, filtering, extraction and interpolation after, then pass through fast Fourier transform (Fast Fourier Transform, FFT) and signal transformed from the time domain to frequency domain, settling signal spectrum measurement.Digital signal processor is done the picking rate that FFT arithmetic speed is much slower than signal, when transient behavior signal appears at signal processing time, instantaneous signal is lost, the ability that when visible PXI-5660 VSA lacks, transient behavior radiofrequency signal is measured.

In the product of domestic current PXI platform, in the majority with PXI data acquisition equipment and generation equipment, as PXI data collecting card, PXI waveform generator etc., the application of this class based on PXI bus is simple.The domestic spectrum analysis module based on PXI bus also only has middle electric 41 AV6951 model PXI Spectrum Analyzers, but maximum resolution bandwidth only has 1M, can not meet the demand of the large broadband of modern communications signal developing direction.

Summary of the invention

Object of the present invention is exactly in order to overcome the deficiency of above-mentioned prior art, provides a kind of reasonable in design, can meet the radio frequency based on PXI bus of the large coverage observation demand of signal of communication frequency domain is measured to vector analysis card insertion type structure module in real time.

In order to achieve the above object, the technical solution used in the present invention is:

A kind of radio frequency based on PXI bus is measured vector analysis card insertion type structure module in real time, include PXI interface and signal processing circuit of intermediate frequency 1, analog to digital conversion circuit 2, receiver circuit 3, frequency synthesizer circuit 4, together with the plug-in card E of peripheral hardware, combine and form a modular construction integral body.Wherein:

Described PXI interface and signal processing circuit of intermediate frequency 1, include again pci interface chip U1, fpga chip U2, SDRAM chip U3, DDC chip U4 and clock chip U6, adopt PCI+FPGA framework, and U1 model is PCI9030, it meets 32 33MHZ follower's chips of PCIV2.2 standard, can make PCI spit and send out transmission speed up to 132MB/S, supports the multiplexed and non-multiplexed 32 bit address/data protocol of local bus; U2 model is XC3SD1800A, and it is the electrical code requirement to Trigger Bus in PXI bus, by the programming of FPGA being completed to the response of triggering signal and the generation of triggering signal realizes PXI interface; U3 model is HY5V52A, for completing storage and the read operation of the required a large amount of digital signal of FPGA; U4 model is HSP50016, for completing signal after sampling

Digital Down Convert process; U6 is local clock chip, provides and adapts to the requirement that PCI difference is spitted a transmission rate, and the reference clock signal of DDC chip, ADC chip and PLL chip.

Analog-digital conversion circuit as described 2, for ADC chip U5, its model is AD6645, and the analog signal of U7 chip output in receiver circuit 3 is converted to digital signal, and deliver to the DDC chip U4 in PXI interface and signal processing circuit of intermediate frequency 1, realize the numeric field of signal and process.

Described receiver circuit 3, include again filter chip U7, U8, U9 and attenuator chip U10, adopt mixing+filter structure, according to upper strata command request, this circuit receives three grades of local oscillation signals of U15 chip, U12 chip and the output of U11 chip from frequency synthesizer circuit 4, complete after input signal mixing, realize the down-conversion of analog signal.Signal after afterbody mixing and filtering is IF signal, and the DDC chip U4 delivering in PXI interface and signal processing circuit of intermediate frequency 1 carries out numeric field processing.

Described frequency synthesizer circuit 4, comprises again PLL chip U11, U12 and U17, LPF chip U13, PD chip U14, YTO chip U15 and frequency divider M/N chip U16, adopt three grades of PLL phase-locked loop frameworks, and PLL chip U11, U12 and U17 are the locking of frequency single-point; LPF chip U13, PD chip U14, YTO chip U15 forms a loop that locking frequency is variable, according to upper strata command request, locks a single-point frequency in variable scope, and delivers to the receiver circuit 3 SRF radiofrequency signal received with it and carry out mixing.

The systems soft ware that the present invention measures vector analysis card insertion type structure module in real time in the radio frequency based on PXI bus mainly comprises upper layer software (applications) platform and the real-time observing and controlling of bottom and data analysis processing two large divisions, adopt modular overall design approach, by the unification of system management layer, dispatched, make every effort to observing and controlling clear process simple and direct.PXI bus is based on Standard PC technology, and user just can use familiar standard Windows software architecture.The exploitation of the PXI system based on Windows and operation also just with the exploitation of standard pci system based on Windows with move identical.In addition,, because PXI backboard is used the pci bus of industrial standard, in many cases, writing with the software program of PXI devices communicating is identical with writing with the software program of PCI module communication.System upper layer software (applications) adopts the programming platform based on Windows, advanced storage administration mechanism to realize man-machine interaction and bottom layer driving.Mainly comprise: virtual key processing capacity, display format and data processing function, bottom layer driving/configuration feature etc.Observing and controlling in real time and data analysis processing section utilize FPGA developing instrument, observing and controlling in real time is fast provided when realizing multiple measurement, data processing function, mainly comprises real time high-speed information processing, real time calibration and correction, System self-test and failure diagnosis etc.

In sum, the present invention has following 7 remarkable functions:

1, the real-time receiving function in broadband

The combination of frequency synthesizer and intermediate-frequency filter has promoted the bandwidth of Observable signal greatly, the signals collecting that can the while real-time bandwidth be reached to 20MHZ comes in to process, and the real-time bandwidth of 20MHZ has extended the ability of fft analysis and the vector analysis of I-Q digital demodulation.

2, real time spectrum measurement function

ADC real-time data collection, and storing data in internal memory, each frame to data, is all seamless in time, (through real-time, effectively trigger), in DSP, carry out data operation, then with multiple display modes, show in real time.The operation of approximate flowing water has guaranteed the power that the real time spectrum of this equipment is measured.

3, the display analysis mode of plurality of optional

Spectrogram, spectrogram, waterfall figure, planisphere, eye pattern, meet the demand that the demonstrations such as table can meet user's multi-angle observation signal.

4, many trigger modes function

Triggering is most important to catching time-domain information, and PXI Spectrum Analyzer provides the triggering modes such as power trigger, level triggers, makes system can accurately catch characteristic signal, carries out labor.

5, advanced system bus platform

PXI bus combines the characteristic of the electric bus characteristic of PCI and the robustness of CompactPCI, modularization and Eurocard mechanical encapsulation, and special synchronous bus and main software characteristic have been increased, can be at faster speed, better degree of compatibility, the stability of more stable performance guarantee instrument and equipment operation and the promptness of function renewal.

6, Vector Signal Analysis function

The real powerful part of PXI Spectrum Analyzer is that it analyzes the ability of time dependent sophisticated signal, analysis project comprises EVM, carrier leak, symbol rate, planisphere, frequency error, quadrature error, modulation accuracy, distortion measurement etc., by vector analysis, user can rapid evaluation and digital modulation signals is carried out to mistake.

7, stored digital oscillography function

Signal can be selectively through the conditioning of baseband signal modulate circuit, trigger and time the logical circuit control such as base control under, through high speed acquisition, become digital signal, deposit in massage storage.By in numeric field, signal is carried out to the processing such as filtering, linear interpolation, accurately demonstrate the time domain waveform of signal.

In addition, the radio frequency that the present invention is based on PXI bus is measured in real time vector analysis card insertion type structure module and in technique, is adopted the design of low-power consumption integral layout, surface mount and " drop in " technology, make compact conformation, rationally distributed, install ingenious, accomplish that implementation is more flexible, extensibility is easier, meets the test of Contemporary Digital communication system and the requirement of analyzing completely, adapts to the needs of development communication technologies.

Accompanying drawing explanation

Fig. 1 is the whole electrical schematic diagram of the present invention.

Symbol description in figure:

1 is PXI interface and signal processing circuit of intermediate frequency, and wherein U1 is pci interface chip, and U2 is fpga chip, and U3 is SDRAM chip, and U4 is DDC chip, and U6 is clock chip;

2 is analog to digital conversion circuit, and wherein U5 is ADC chip;

3 is receiver circuit, and wherein U7 is IF filter chip, and U8 and U9 are filter chips, and U10 is attenuator chip;

4 is frequency synthesizer circuit, and wherein U11, U12 and U17 are PLL chips, and U13 is LPF chip, and U14 is PD chip, and U15 is YTO chip, and U16 is frequency divider M/N chip.

Embodiment

Referring to shown in Fig. 1, is the specific embodiment of the invention.

As can be seen from Figure 1: the present invention includes PXI interface and signal processing circuit of intermediate frequency 1, analog to digital conversion circuit 2, receiver circuit 3, frequency synthesizer circuit 4, together with the plug-in card E of peripheral hardware, combines and forms a modular construction integral body, wherein:

Described PXI interface and signal processing circuit of intermediate frequency 1 are PCI+FPGA and DDC+FPGA framework, be provided with pci interface chip U1, DDC chip U4, fpga chip U2, SDRAM chip U3 and clock chip U6, and the address of pci interface chip, data and control port are directly connected with PXI bus through plug-in card E; The HP port of pci interface chip U1 is directly two-way connection with the FP port of fpga chip U2; The 7th, 9 pin of DDC chip U4 are directly connected with the 11st, 12 pin of fpga chip U2 respectively successively; The FD port of the fpga chip U2 port corresponding with SDRAM chip U3 is directly two-way connection.

Analog-digital conversion circuit as described 2, is provided with ADC chip U5, and the 8th, 3 pin of ADC chip U5 are directly connected with the 5th pin of DDC chip U4 in PXI interface and signal processing circuit of intermediate frequency 1 and the 3rd pin of clock chip U6 respectively successively.

Described receiver circuit 3, be 3 grades of mixing+3 grade filtering frameworks, be provided with III, II, 3 frequency mixers of I, 3 filter chip U7, U8 and U9 and 1 attenuator chip U10, and attenuator chip U10 is tandem type and is connected with I, II, III frequency mixer successively with filter U9, U8 and U7, and the 11st pin of filter chip U7 is directly connected with the 5th pin of ADC chip U5 in analog to digital conversion circuit 2.

Described frequency synthesizer circuit 4, be 3 grades of PLL phase-locked loop frameworks, be provided with 3 PLL chip U11, U12 and U17,1 LPF chip U13,1 PD chip U14,1 YTO chip U15 and 1 M/N chip U16, and the 6th pin of PLL chip U17 is directly connected with the 10th pin separately of PLL chip U11 and U12 and the 5th pin of PD chip U14 respectively simultaneously; And the 2nd pin of YTO chip U15 and PLL chip U12 are directly connected with the 8th pin of I, II, III frequency mixer in receiver circuit 3 respectively successively with U11 the 12nd pin separately.

Described plug-in card E is 3UPXI4 groove position normal structure, is provided with 2 connectors, and wherein 1 is 1 groove position, provides 32 for the business for PCI local bus definition, and another 1 is 3 grooves, is provided for 64 and transmits and realize the business of PXI electrical characteristic for PCI.

Basic mechanical design feature in specific embodiment of the invention is as follows:

One, frequency characteristic

Frequency range 100kHz～3GHz

Maximum analysis bandwidth 20MHz

Resolution bandwidth (RBW) 1Hz～3MHz, 1-3-10 stepping

Input power range (continuously)-120dBm～+ 30dBm

RF input attenuation 0～50dB(10dB stepping)

Two, radiofrequency signal frequency conversion

First local oscillator 3.2814～6.2814GHz

The second local oscillator 3.0GHz

The 3rd local oscillator 260MHz

Export the 3rd intermediate frequency 21.4MHz output, maximum bandwidth 20MHz

Three, Digital IF Processing

Fft analysis frame length maximum 4096

Measure display format spectrogram

Above embodiment, is preferred embodiment of the present invention, in order to technical characterictic of the present invention and embodiment to be described, not in order to limit the right of applying for a patent of the present invention; Above description, should understand and be implemented for knowing those skilled in the art simultaneously.Therefore, other are not departing under disclosed prerequisite, and the equivalent change or the modification that complete are all included in described claim.

The present invention is that a rare radio frequency based on PXI bus is measured vector analysis card insertion type structure module in real time, and creative, novelty, practicality and progressive, meet application for a patent for invention important document, therefore file an application according to Patent Law.

Claims (1)

1. the radio frequency based on PXI bus is measured vector analysis card insertion type structure module in real time; include PXI interface and signal processing circuit of intermediate frequency (1); analog to digital conversion circuit (2); receiver circuit (3); frequency synthesizer circuit (4) is together with the plug-in card (E) of peripheral hardware; combine and form a modular construction integral body, it is characterized in that;

A, described PXI interface and signal processing circuit of intermediate frequency (1) are PCI+FPGA and DDC+FPGA framework, be provided with pci interface chip (U1), DDC chip (U4), fpga chip (U2), SDRAM chip (U3) and clock chip (U6), and the address of pci interface chip, data and control port are directly connected with PXI bus through plug-in card (E); The HP port of pci interface chip (U1) is directly two-way connection with the FP port of fpga chip (U2); The 7th, 9 pin of DDC chip (U4) are directly connected with the 11st, 12 pin of fpga chip (U2) respectively successively; The FD port of fpga chip (U2) port corresponding with SDRAM chip (U3) is directly two-way connection;

B, analog-digital conversion circuit as described (2), be provided with ADC chip (U5), and the 8th, 3 pin of ADC chip (U5) are directly connected with middle the 5th pin of DDC chip (U4) of PXI interface and signal processing circuit of intermediate frequency (1) and the 3rd pin of clock chip (U6) respectively successively;

C, described receiver circuit (3), be 3 grades of mixing+3 grade filtering frameworks, be provided with (III), (II), (I) 3 frequency mixers, 3 filter chips (U7), (U8) and (U9) He 1 attenuator chip (U10), and attenuator chip (U10) and filter (U9), (U8) and (U7) be tandem type and be connected with (I), (II), (III) frequency mixer successively, and the 11st pin of filter chip (U7) is directly connected with the 5th pin of ADC chip (U5) in analog to digital conversion circuit (2);

D, described frequency synthesizer circuit (4), be 3 grades of PLL phase-locked loop frameworks, be provided with 3 PLL chips (U11), (U12) and (U17), 1 LPF chip (U13), 1 PD chip (U14), 1 YTO chip (U15) and 1 M/N chip (U16), and the 6th pin of PLL chip (U17) is directly connected with the 10th pin separately of PLL chip (U11) and (U12) and the 5th pin of PD chip (U14) respectively simultaneously; And the 2nd pin of YTO chip (U15) and PLL chip (U12) are directly connected with the 8th pin of (I), (II), (III) frequency mixer in receiver circuit (3) respectively successively with (U11) the 12nd pin separately.

2 .radio frequency based on PXI bus as claimed in claim 1 is measured vector analysis card insertion type structure module in real time, it is characterized in that: described plug-in card (E) is 3UPXI4 groove position normal structure, is provided with 2 connectors, and wherein 1 is 1 groove position, and another 1 is 3 grooves.

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