CN206906452U - A kind of oscillograph input modulate circuit and CC types radar test and fault detection system - Google Patents
A kind of oscillograph input modulate circuit and CC types radar test and fault detection system Download PDFInfo
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- CN206906452U CN206906452U CN201720756342.5U CN201720756342U CN206906452U CN 206906452 U CN206906452 U CN 206906452U CN 201720756342 U CN201720756342 U CN 201720756342U CN 206906452 U CN206906452 U CN 206906452U
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Abstract
The utility model discloses a kind of oscillograph input modulate circuit and CC types radar test and fault detection system, belong to radar test and testing equipment field.The utility model includes PXI e interface, FPGA, relay, impedance network and current buffer, PXI e interface is connected with oscillograph terminal, FPGA input is connected with PXI e interface, FPGA output end is connected with relay, impedance network includes two load channels, load channel in the impedance command selection impedance network that relay is exported according to FPGA, relay are connected with current buffer simultaneously, and the output end of current buffer and the input of oscillograph connect.FPGA is received and is produced relay control signal, control relay, so as to switch the oscillograph TCH test channel input impedance of CC radar tests and fault detection system, to meet different detection demands according to order after the impedance order of PXI e interface in the utility model.
Description
Technical field
The utility model belongs to radar test and testing equipment field, more specifically to a kind of CC types radar test
Modulate circuit is inputted with fault detection system oscillograph.
Background technology
China New Generation Weather Radar has played important function in terms of diastrous weather monitoring and Warning Service, in order to ensure thunder
Run up to regular traffic, domestic many technical guarantee personnel have accumulated many experiences, such as king in terms of accident analysis and maintenance
Will force (Wang Zhiwu, Zhou Honggen, Lin Zhongnan, China New Generation Weather Radar SA＆B accident analysis [J] modern radars, 2005,27
(1)：16-17,28) similar fault that more than ten of CINRAD SA/B radar occurs etc. is collected and arranged, is pointedly proposed
Some strengthen the measure of China New Generation Weather Radar reliability and the opinion of the machine radar performance.Beam gold dollar (beam gold dollar, CINRAD/
CC radar transmitter high voltage power supply repair methods and fault diagnosis example [J] Shanxi are meteorological, and 2005, (3)：33-34,36) by dividing
CINRAD/CC radar transmitter high voltage power supply operation principles are analysed, and the maintenance side of high voltage power supply is proposed by fault diagnosis example
Method.Arranged net as China Meteorological Administration's weather service the equipment used, CINRAD/CC types radar has higher reliability, stably
Property well preferable maintainability, when radar breaks down, according to the instruction alarm condition of warning message combination maintenance control panel, makes phase
The judgement answered, according to each System Working Principle and signal flow, and the circuit that directly maintenance is thought with alarm parameters.But have
Failure caused by the decline of performance parameter index is not main malfunction monitoring point, and radar monitoring system, which can not detect, to be out of order
And alarm, it is necessary to the reason for technical staff finds out failure by analysis and trouble point.
CC types radar test and fault detection system oscillograph input modulate circuit have low cost, small volume, long lifespan,
Environmental pollution is small, easy to carry, simple operation and other advantages, due to China New Generation Weather Radar test with fault diagnosis system in,
There is the flow of a test pulse envelope, the requirements of process uses 50 Ω input impedance, but other measurement contents need 1M
Ω input impedance, existing modulate circuit structure is more complicated, is not suitable for being applied directly to CC types radar test and failure
The input impedance of conditioning oscillograph is gone in detecting system, therefore needs to design a kind of modulate circuit to realize 50 Ω and 1M Ω input resistances
Anti- automatic switchover, to realize the measurement of radar relevant parameter.
The content of the invention
1st, to solve the problems, such as
The problem of can not automatically switching for the impedance gear in existing CC types radar fault detecting system, this practicality are new
Type provides a kind of oscillograph input modulate circuit and CC types radar test and fault detection system, and 50 are devised in impedance network
Ω load channels and 1M Ω load channels, the oscillograph impedance order from PXIe is received by FPGA, according to bus line command pair
Relay is controlled, and switches its load channel.
2nd, technical scheme
To solve the above problems, the utility model adopts the following technical scheme that.
A kind of oscillograph inputs modulate circuit, including PXI e interface, FPGA, relay, impedance network and current buffer,
Described PXI e interface is connected with oscillograph terminal, and described FPGA input is connected with PXI e interface, described FPGA's
Output end is connected with relay, and described impedance network includes two load channels, and described relay exports according to FPGA
Load channel in impedance command selection impedance network, described relay are connected with current buffer simultaneously, described electric current
The output end of buffer and the input of oscillograph connect.
Further, described FPGA is XC6SLX45T, has 4 pairs of HSSI High-Speed Serial Interfaces, described PXI e interface with
FPGA HSSI High-Speed Serial Interface connection, realizes that standard PXIe communicates.
Further, described impedance network includes 50 Ω load channels and 1M Ω load channels.
Further, described current buffer is BUF634.
Further, described PXI e interface is powered for FPGA, and LC power filters are used successively before power input FPGA
Device and electromagnetic interface filter are filtered processing.
A kind of CC types radar test and fault detection system, including oscillograph and oscillograph described in above-mentioned any one it is defeated
Enter modulate circuit.
Further, in addition to frequency spectrograph and/or universal meter, described universal meter is connected with CC type radars, for surveying
Measure its voltage or electric current；Described frequency spectrograph is used for the change in electric for measuring CC type radars.
Oscillograph input impedance is 50 ohm in existing fault detection system, and 50 ohm and 1 are needed during practical application
It can switch between megohm, so devising oscillograph input front end devises impedance modulate circuit, be designed in impedance network
50 ohm load passages and 1 megohm of load channel, can switch its load channel on modulate circuit by relay.
Oscillograph terminal panel in fault detect platform sends impedance order by PXI e interface to modulate circuit, and FPGA receives terminal
Relay control signal, control relay, so as to switch CC radar tests and fault detect are produced according to order after impedance order
The oscillograph TCH test channel input impedance of system.
3rd, beneficial effect
Compared to prior art, the beneficial effects of the utility model are：
(1) the utility model solves the impedance matching of CC types radar test and fault detection system oscillograph input circuit
Problem, go to realize 50 Ω of Auto-matching/1M Ω impedance by FPGA control relays, it is possible to achieve remote control, operation is more
Add simply, operator can quick left-hand seat；
(2) the utility model can need unrestricted choice difference impedance according to detection, improve CC types radar test and event
Hinder the degree of accuracy that pulse envelope is tested in detecting system；
(3) the utility model is powered by PXIe buses to FPGA, before power input is to FPGA, is filtered using LC power supplys
Ripple device and electromagnetic interface filter are handled, and filter out the noise of power supply, improve the stability of power supply；
(4) CC types radar test has two to lead to fault detection system oscillograph input modulate circuit in the utility model
Road, match (oscillograph also there are two passages) with the port number of oscillograph, two passages can connect letter when in use
Number.
Brief description of the drawings
Fig. 1 is the theory diagram that modulate circuit is inputted in the utility model；
Fig. 2 is the schematic diagram that modulate circuit is inputted in the utility model；
When Fig. 3 is the utility model Instrumental quantity increase, the handling capacity change schematic diagram of system.
Embodiment
The utility model is further described below with reference to specific embodiment.
Embodiment 1
As Figure 1-Figure 2, a kind of oscillograph input modulate circuit, including PXI e interface, FPGA, relay, impedance net
Network and current buffer, PXI e interface are connected with oscillograph terminal, FPGA XC6SLX45T, have 4 pairs of HSSI High-Speed Serial Interfaces,
PXI e interface and FPGA HSSI High-Speed Serial Interface are connected, and realize that standard PXIe communicates, and FPGA output end is connected with relay, is hindered
Anti- network includes two load channels (being respectively 50 Ω load channels and 1M Ω load channels), and relay exports according to FPGA
Load channel in impedance command selection impedance network, relay connect with current buffer (current buffer BUF634) simultaneously
Connect, the output end of current buffer and the input of oscillograph connect.PXI e interface is powered for FPGA simultaneously, power input
Processing is filtered using LC power-supply filters and electromagnetic interface filter successively before FPGA.
A kind of CC types radar test and fault detection system, including oscillograph and above-mentioned oscillograph input modulate circuit,
Oscillograph input modulate circuit receives the test signal of detecting system, suitable impedance is selected according to test signal, to adapt to survey
Try the flow of pulse envelope or the demand of other testers (such as frequency spectrograph, universal meter).
Powered in the present embodiment using PXIe bus power sources, a series of power filter and power supply pipes are have passed through in terms of power supply
Reason, FPGA receive the oscillograph impedance order from PXIe, are controlled according to order and produce relay control signal, control relay
Device selects different impedances.System structure design is as shown in Figure 1.The modulate circuit specific work process of the present embodiment is：CC types
Radar test receives the input of detection signal with fault detection system, and signal is transferred into FPGA, FPGA by PXI e interface
Signal is received, if the demand of the flow of test pulse envelope, then FPGA produces relay control signal, selects relay
50 Ω input impedance is selected, then by BUF634 to oscillograph output current；If demand (the example of other test contents
Such as universal meter detects), then FPGA produces relay control signal, makes relay selection 1M Ω input impedance, then passes through
BUF634 is to oscillograph output current.
The XC6SLX45T model FPGA of company of selection match SEL, have 4 pairs of HSSI High-Speed Serial Interfaces, its high speed in the design
Serial line interface directly can be connected with PXIe high-speed interface, called official to provide IP and realized PXIe buses and board local bus bridge
Connect, then FPGA is being controlled according to bus line command to relay, realizes the impedance control of oscillograph input.
PXIe buses
The slot of PXIe hybrid compatibles so that PXI can cooperate in same system with PXI-Express modules.Therefore
PXI has three key technology advantages towards automatic test application with PXI-Express systems.These technical advantage bags
Include：
(1) the flexible, instrument of software definition；
(2) modular instrument is integrated；
(3) high data throughput.
The instrument system possessed flexibility of software definition so that user can be that a variety of measurements reconfigure
Test system.This communicates for RF/, and manufacture test is particularly important, and the field usually needs to be directed to multiple agreements to same equipment
Standard carries out particular measurement.
Secondly, modular instrument is integrated into same system so that user can be from more than 1500 kinds existing PXI instruments
The middle suitable instrument of selection.These instruments include the instrument of peak performance in T ＆ M industry；
1) 18 high-accuracy multifunctional data acquisitions.
2) sample rate is 500ks/s, and precision is up to the high-precision digital instrument of 24.
3) there is quick 7 Semi-digitals milli table of PA precision and 1000v measurement ranges.
4) 6.6GHz RF signal analysis and generator are up to.
5) high density port number and synchronous (up to 5000 dynamic channels).
This ability for using multiple PXI instruments in same system so that single test system can be used for testing it is a variety of
Mixed signal device.PXI systems are used for mixed signal semiconductor ASIC features during one common application.
Finally, PXI is respectively provided with a high-performance number for instrument to host PC transmission information with PXI-Express instruments
According to line.PXI instruments provide up to 132MB/s shared bandwidth for all devices in bus.PXI-Express instruments pass through fast
Fast pci bus even can reach higher handling capacity.PCI express bus is a point-to-point high-speed serial bus, and its is every
Slot bandwidth can expand to 2GB/s from 250MB/s.For example, an x4PXI-Express slot carries for the equipment in the slot
Dedicated bandwidth for being up to 1GB/s.In addition when more multiple instruments are added into system, the handling capacity of system accordingly increases, such as
Shown in Fig. 3.
The raising of PXI-Express instrument handling capacities so that several new applications are possibly realized.Handled up by the height of bus
Amount, PXI-Express instruments cooperate with use with PXI-Express RAID hard disk drives, it is possible to achieve high-speed data conductance
Enter the configuration of disk or data flow export disk.This ability is particularly suitable for use in two special applications --- intelligent signal and numeral
Video measurement.
PXI modular instruments system utilize main flow PC in advanced technology, define it is a kind of it is firm, available for measurement and
The calculating platform of automation.The system also makes full use of the pci bus technology of standard, benefits from widely used software and hardware
Component.Software program and operating system in PXI systems are early had been used in daily Desktop PC, it is possible to are developed quickly
Work.Firm industrial package, substantial amounts of I/O slots, and advanced timing and Trigger Function are also add in PXI, can be filled
Divide and meet your application demand.
The design advantage of NI PXI cabinets and controller-- from thermal diffusivity, Electro Magnetic Compatibility, power supply reliability, stability,
The technical standpoint such as software support and compatibility, NI PXI cabinets and controller product in design, production, after-sale service etc. all
It is optimized.
NI PXI slot baffle plates-NI additionally provides the modularization PXI filling plates of slot baffle plate, i.e. plastics, takes in case not
The slot used.Effective cooling air-flow can so be strengthened by reducing the air-flow in empty slot.Can using slot baffle plate
So that the temperature rise of electronic component reduces by 20% in operational module, so as to improve the temperature reduction performance of cabinet.
FPGA
FPGA (Field Programmable Gate Array) field programmable gate array, it be GAL,
The product further developed on the basis of the programming devices such as CPLD.It is as in application specific integrated circuit (ASIC) field
A kind of semi-custom circuit and occur, both solved the deficiency of custom circuit, overcome original programming device gate circuit number again
The shortcomings that limited.It is the main hardware platform of current Design of Digital System, its main feature be exactly passed through completely by user it is soft
Part is configured and programmed, and so as to complete certain specific function, PCB, is simply changed on computers and is updated journey
Sequence, hardware design work is turned into software development and work, shorten the cycle of system design, improve flexibility and the drop of realization
Low cost.
The characteristics of FPGA：
(1) high-performance is real-time, due to being to complete hardware by individual logic units up to a million to realize inside fpga chip,
Ability with parallel processing, arithmetic speed single-chip microcomputer than usual and DSP are many soon.
(2) highly integrated property FPGA can internally be embedded in hard/soft IP kernel according to the demand of user, be required with realizing different
And the area of target hardware can be also saved using SOPC technologies.
(3) high reliability and inexpensive current fpga chip all did 100% detection before dispatching from the factory, it is not necessary to set
Meter personnel undertake the expense for throwing piece production.
(4) high flexibility and low-power consumption FPGA are field-programmables, and the programming that user can be repeatedly is erasable, are used, or
In the case where peripheral circuit keeps constant, realize different functions using different designs, so to product upgrading with
Maintenance brings great convenience.
In CC types weather radar of the present utility model test and fault diagnosis system, to realize the Ω of Auto-matching 50 and 1M
Ω function, in data acquisition module, higher is required to real-time and precise control, so generally can all select FPGA to come
Control relay.
Relay
Relay (English name：Relay it is) a kind of electric control device, is when the change of input quantity (energizing quantity) reaches rule
During provisioning request, make controlled volume that a kind of electrical equipment of predetermined Spline smoothing occur in electric output circuit.It has control system
(also known as input circuit) and by the interactive relationship between control system (also known as output loop).It is commonly used to the control of automation
In circuit, it is actually to be gone to control one kind " automatic switch " of high current running with low current.Therefore play in circuit automatic
Regulation, safeguard protection, change-over circuit etc. act on.
Relay is the automatic switch element for having isolation features, be widely used in remote control, remote measurement, communicate, automatically control,
It is one of most important control element in electromechanical integration and power electronic equipment.
Relay typically has and can reflect certain input variable (such as electric current, voltage, power, impedance, frequency, temperature, pressure
Power, speed, light etc.) induction mechanism (importation)；" logical ", the executing agency of " disconnected " control can be realized to controlled circuit by having
(output par, c)；Between the importation of relay and output par, c, coupling isolation, function treatment also are carried out to input quantity
With the intermediary agency's (drive part) being driven to output par, c.
As control element, sum up, relay there are following several effects：
1) control range is expanded：For example, when many-contact relay control signal reaches certain certain value, can be by contact sets
Multi-form, while changing-over, cut-off, connect multiplex circuit.
2) amplify：For example, sensitive-type relay, auxiliary reclay etc., with a very small controlled quentity controlled variable, can be controlled very
Powerful circuit.
3) integrated signal：For example, when multiple control signal presses defined form and inputs multiwound relay, by comparing
It is comprehensive, reach predetermined control effect.
4) automatic, remote control, monitoring：For example, the relay in automatics can form program control together with other electrical equipment
Circuit processed, so as to realize automatic operating.
Current buffer
Input in modulate circuit with fault detection system oscillograph in the CC types radar test of the present embodiment, delayed using electric current
Rush the model BUF634 of device.BUF634 is a kind of high speed open-loop gain buffer, and it can be used for the feedback loop of operational amplifier
In road, increase output current together and eliminate Thermal feedback and improve capacitive load driving.Application for a low-voltage, BUF634
1.5mA quiescent currents are operated in, are exported as 250mA, 2000u/s voltage conversioning rates and 30MHz bandwidth.Frequency bandwidth can be adjusted
It is whole, from one resistance of connection between 30MHz--180MHz, V- and BW pins.Output circuit is protected by internal current limit completely
Make its sturdy and durable with heat shutoff, it is easy to use.
The effect of buffer：
1st, the matching of speed is completed.
The 2nd, one temporary space is provided.
3rd, amplified signal, driving force is improved.Reduce the influence of transmission and load to signal source.
4th, the effect of signal isolation, influence of the load to signal source is eliminated.
The key technical indexes
1st, driving current：250mA；
2nd, bandwidth：180MHz；
3rd, response speed：≤5ns.
Claims (7)
1. a kind of oscillograph inputs modulate circuit, it is characterised in that：Including PXI e interface, FPGA, relay, impedance network and electricity
Stream damper, described PXI e interface are connected with oscillograph terminal, and described FPGA input is connected with PXI e interface, described
FPGA output end be connected with relay, described impedance network includes two load channels, described relay according to
Load channel in the impedance command selection impedance network of FPGA outputs, described relay are connected with current buffer simultaneously,
The output end of described current buffer and the input of oscillograph connect.
A kind of 2. oscillograph input modulate circuit according to claim 1, it is characterised in that：Described FPGA is
XC6SLX45T, there are 4 pairs of HSSI High-Speed Serial Interfaces, described PXI e interface and FPGA HSSI High-Speed Serial Interface connection, realize standard
PXIe communicates.
A kind of 3. oscillograph input modulate circuit according to claim 1, it is characterised in that：Described impedance network includes
50 Ω load channels and 1M Ω load channels.
A kind of 4. oscillograph input modulate circuit according to claim 1 or 2 or 3, it is characterised in that：Described electric current delays
It is BUF634 to rush device.
A kind of 5. oscillograph input modulate circuit according to claim 4, it is characterised in that：Described PXI e interface is
FPGA is powered, and processing is filtered using LC power-supply filters and electromagnetic interface filter successively before power input FPGA.
6. a kind of CC types radar test and fault detection system, it is characterised in that：Including any in oscillograph and claim 1-5
Oscillograph input modulate circuit described in one.
7. a kind of CC types radar test according to claim 6 and fault detection system, it is characterised in that：Also include frequency spectrum
Instrument and/or universal meter, described universal meter is connected with CC type radars, for measuring its voltage or electric current；Described frequency spectrograph is used
In the change in electric of measurement CC type radars.
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| CN201720756342.5U CN206906452U (en) | 2017-06-27 | 2017-06-27 | A kind of oscillograph input modulate circuit and CC types radar test and fault detection system |
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|---|---|---|---|
| CN201720756342.5U CN206906452U (en) | 2017-06-27 | 2017-06-27 | A kind of oscillograph input modulate circuit and CC types radar test and fault detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907904A (en) * | 2019-11-14 | 2020-03-24 | 成都信息工程大学 | Solar method azimuth beam width correction method |
| CN113075439A (en) * | 2021-06-04 | 2021-07-06 | 深圳市鼎阳科技股份有限公司 | Input impedance protection circuit and method of digital oscilloscope and digital oscilloscope |
-
2017
- 2017-06-27 CN CN201720756342.5U patent/CN206906452U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907904A (en) * | 2019-11-14 | 2020-03-24 | 成都信息工程大学 | Solar method azimuth beam width correction method |
| CN110907904B (en) * | 2019-11-14 | 2021-11-05 | 成都信息工程大学 | Solar method azimuth beam width correction method |
| CN113075439A (en) * | 2021-06-04 | 2021-07-06 | 深圳市鼎阳科技股份有限公司 | Input impedance protection circuit and method of digital oscilloscope and digital oscilloscope |
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