CN105119671A - Multichannel scattering parameter testing circuit and method for complex modulation and phase coherence system - Google Patents
Multichannel scattering parameter testing circuit and method for complex modulation and phase coherence system Download PDFInfo
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Abstract
The invention provides a multichannel scattering parameter testing circuit and method for a complex modulation and phase coherence system. The multichannel scattering parameter testing circuit comprises a master control computer, a PXI cabinet, a shared local oscillator signal generating unit, a shared clock reference generation unit, a multichannel complex modulation and phase coherence excitation signal generating unit, a multichannel complex modulation and phase coherence excitation signal conditioning unit, a multichannel complex modulation and phase coherence excitation signal separating and reflection extraction unit, a multichannel complex modulation and phase coherence response signal separating and transmission extraction unit, a multichannel complex modulation and phase coherence response signal reception and conditioning unit and a multichannel complex modulation and phase coherence response testing and analyzing unit. During an actual test, the irregular influence factors such as long path and mismatching between a testing port and a testing calibration surface can be reduced or eliminated, and the expansion of signal separating and extraction technical characteristics can be realized through variable performance configuration.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly a kind of multichannel scattering parameter test circuit being applicable to complex modulation and phase coherence system, also relate to a kind of multichannel scattering parameter method of testing being applicable to complex modulation and phase coherence system.
Background technology
Along with continuous fast development and the application fusion of microwave technology, microelectric technique, information technology etc., the function of push to test object (with microwave complex network/assembly for Typical Representative) is more abundant, technology composition is more complicated with application state, more urgent demand is also presented to its characteristic present's (Obtaining Accurate as scattering parameter) under corresponding complex state, therefore, renewal, higher technical requirement are proposed to measuring technology or Related product.New testing requirement can not be adapted under many circumstances based on the vector network analyzer of conventional individual framework and pattern and framework thereof, need to propose innovatively or formed the method for testing and technology that adapt with application demand.
Under usual state, the method characterizing microwave network technical characteristic adopts vector network analyzer to test its scattering parameter, its test philosophy is vector network analyzer for tested object provides the pumping signal of a road continuous wave (or only can provide simple pulse modulation), receive the road reflex response signal with tested object characteristic information and a road transmission response signal simultaneously, after test analysis process, obtain the scattering parameter characterizing microwave network technical characteristic.
Or, the coherent pumping signal of multichannel continuous wave (or only can provide multichannel simple pulse modulation) is provided by the mode that multichannel homophase merit is divided at excitation end, and receive the multichannel response signal with tested object characteristic information at receiving terminal by survey mode of the patrolling timesharing (non-Multi-path synchronous is real-time) of switching over, after test analysis process, obtain the scattering parameter characterizing microwave network technical characteristic.
According to the demand analysis of practical application, the scattering parameter of vector network analyzer test microwave complex network/assembly exists following not enough:
(1), the pumping signal of test is limited to the inherent technology characteristic (only supporting involve simple pulsed mode continuously and can not support more systems, more complicated modulating mode) of vector network analyzer, can not meet under multichannel complex modulation and phase coherence pattern technical requirements such as the multichannel of test and excitation signal, complex modulation, phase coherence, excitation behavior are configurable;
(2), vector network analyzer provides the mode of multichannel continuous wave (or only can provide simple pulse modulation) phase coherence pumping signal to there is inherent technology limitation by dividing in excitation end increase multichannel homophase merit: do not support that complex modulation encourages; Excitation passage insertion loss is large, exciting power scope during impact test; Excitation interchannel isolation is poor, impact calibration effect and test result; The systematic error of introducing need be divided to carry out error correction to multichannel homophase merit by comparatively complicated calibration steps, complicated operation, efficiency are low, and the test performance provided can not meet the relevant art requirement of actual Test Application demand;
(3), the Signal separator of test and reflection/transmission extraction be limited to the inherent technology characteristic of vector network analyzer, can not meet multichannel complex modulation with under phase coherence pattern to encouraging, response signal is separated and reflects/transmit the technical requirements such as multichannel, the separated/extracted performance extracted be configurable;
(4), the response signal of test receives and is limited to the inherent technology characteristic of vector network analyzer, can not meet under multichannel complex modulation and phase coherence pattern technical requirements such as the multichannel of test response signal, complex modulation, phase coherence, response performance are configurable;
(5), vector network analyzer increases diverter switch by receiving terminal and carries out timesharing (non-Multi-path synchronous is real-time) and patrol the mode surveying tested object each passage scattering parameter and there is inherent technology limitation: do not support that collaborative receptions under complex modulation pattern is tested, lack real-time, cannot carry out each interchannel synchronous consistency contrast test etc., the test performance provided can not meet the relevant art requirement of actual Test Application demand;
(6), the calibration effect of test is limited to the claimed range of the required state of the art of vector network analyzer calibration, under multichannel complex modulation and phase coherence pattern, the non-traditional conventional factors being difficult to be eliminated by conventional vector network analyzer calibrating mode due to there is path length between test port and detection calibration face (expansion), insertion loss is large, mismatch link is many, combination of channels state is many etc. is affected, and can not meet the requirement of practical application to test accuracy;
(7), the application of test is limited to the inherent technology characteristic of vector network analyzer conventional individual framework (as overall dimension, weight, the fixing and performance index etc. of not configurable adjustment), do not meet complex modulation and the larger multichannel scattering parameter testing requirement of phase coherence pattern lower channel by the mode of cascade expansion;
(8), the expanded application of test is limited to the inherent technology characteristic of vector network analyzer conventional individual framework, can not in the mode of software radio, by loading different testing softwares, when basic hardware platform system is constant, realize the various test functions of the multi-parameters such as frequency domain/time domain.
Therefore, one how is provided to be applicable to complex modulation and phase coherence system, and the multichannel scattering parameter test circuit of performance visual feelings configuration realization and method, in unitized mode, meeting measuring technology Capability Requirement higher in practical application and more complicated testing requirement to greatest extent, is current problem demanding prompt solution.
Summary of the invention
The invention provides a kind of the multichannel scattering parameter test circuit and the method that are applicable to complex modulation and phase coherence system, without the need to using vector network analyzer, can for different practical application testing requirements, scattering parameter Testing And Regulating under Solving Multichannel complex modulation and phase coherence pattern, and the technical problem such as the flexible configuration of function/performance, in unitized mode, meet measuring technology Capability Requirement higher in practical application and more complicated testing requirement to greatest extent.
Technical scheme of the present invention is achieved in that
A kind of multichannel scattering parameter test circuit being applicable to complex modulation and phase coherence system, comprise: main control computer, PXI cabinet, share local oscillation signal generating unit, share clock reference generating unit, multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit, multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit,
Wherein, main control computer, by PXI cabinet and core bus, receives conditioning unit, multichannel complex modulation and phase coherence response test analytic unit to multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal, share local oscillation signal generating unit, shares clock reference generating unit Collaborative Control in the framework of PXI bus;
Share clock reference generating unit for multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, shared local oscillation signal generating unit provides same clock reference and triggering synchronous clock signal, to ensure the coherence of each unit on time/frequency;
Sharing local oscillation signal generating unit is locked on shared clock reference signal, be respectively multichannel complex modulation and phase coherence pumping signal generating unit and multichannel complex modulation and phase coherence response signal to receive conditioning unit and provide radio-frequency carrier and local oscillation signal, to ensure the complex modulation that corresponding units outputs signal and coherence;
Multichannel complex modulation and phase coherent signal generating unit adopt several based on the miniaturized vector signal generation module of PXI bus, the inner baseband signal of modules occurs to adopt same shared clock reference and triggered synchronous mode, to ensure the coherence of multichannel baseband signal; The inner Vector Modulation passage of modules adopts same shared local oscillator, and by Vector Modulation realization to the real-time adjustment of phase place and correction, to ensure the coherence of multi-channel radio frequency pumping signal;
Multichannel complex modulation and phase coherence pumping signal conditioning unit adopt the conditioning channel module of several miniaturizations based on PXI bus amplification/attenuation/up-conversion able to programme, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, meet the differentiation requirement of different demand for exciting signal frequency scope, power bracket characteristic;
Multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit and adopts some external dual directional coupler modules, described dual directional coupler module is carried out design according to the requirement of different technologies index and is realized, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, meet the differentiation requirement of different demand for pumping signal, reflex response signal extraction characteristic;
Multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit and adopts some external dual directional couplers and load blocks, described dual directional coupler and load blocks are carried out design according to the requirement of different technologies index and are realized, by with multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and the adaptability that reflects extraction unit configures, meet the differentiation requirement of different demand for characteristics such as transmission response signal extractions,
Multichannel complex modulation and phase coherence response signal receive the conditioning channel module that conditioning unit adopts some decay/down-conversions, to be separated with phase coherence response signal and the adaptability of transmitting extraction unit configures by be separated with phase coherence pumping signal with multichannel complex modulation and to reflect extraction unit, multichannel complex modulation, receive be coupled from reference of corresponding units, reflection coupling and transmission coupled signal, meet different demand for excitation reception, the differentiation requirement responding the characteristics such as reception;
Multichannel complex modulation and phase coherence response test analytic unit adopt some multichannel digital instrument modules, configured by the adaptability receiving conditioning unit with multichannel complex modulation and phase coherence response signal, meet different demand for the differentiation requirement of excitation with response test analytical characteristics.
Alternatively, obtain reference coupled signal R, the reflection coupling signal A under real-time collaborative mode of operation and transmit amplitude and the phase information of coupled signal B, computing formula according to scattering parameter: S11=A/R, S21=B/R, obtains the scattering parameter of multiple channel test object under complex modulation and phase coherence pattern.
Alternatively, the detection calibration of described scattering parameter is based on 12 VECs, respectively test open circuit device, short-circuiting device, load, thru calibration part, by calculating the error coefficient extracting each error term, carry out correction computing when reality is tested, obtain test result.
Based on above-mentioned test circuit, present invention also offers a kind of multichannel scattering parameter method of testing being applicable to complex modulation and phase coherence system, with main control computer loading application software, by PXI cabinet and core bus, multichannel complex modulation and phase coherence pumping signal generating unit is controlled in the framework of PXI bus, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, share local oscillation signal generating unit, share clock reference generating unit, work in coordination with as object structure to be tested and multichannel is provided, complex modulation, phase coherence pumping signal and environment, and the response signal of real-time reception analysis reflection/transmission, by the computing formula of scattering parameter to obtain the scattering parameter characteristic of object to be tested under complex modulation and phase coherence pattern,
Share clock reference generating unit for multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, shared local oscillation signal generating unit provides same clock reference and triggering synchronous clock signal, to ensure the coherence of each unit on time/frequency;
Sharing local oscillation signal generating unit is locked on shared clock reference signal, be respectively multichannel complex modulation and phase coherence pumping signal generating unit and multichannel complex modulation and phase coherence response signal to receive conditioning unit and provide radio-frequency carrier and local oscillation signal, to ensure the complex modulation that corresponding units outputs signal and coherence;
Multichannel complex modulation and phase coherent signal generating unit adopt several based on the miniaturized vector signal generation module of PXI bus, the inner baseband signal of modules occurs to adopt same shared clock reference and triggered synchronous mode, to ensure the coherence of multichannel baseband signal; The inner Vector Modulation passage of modules adopts same shared local oscillator, and by Vector Modulation realization to the real-time adjustment of phase place and correction, to ensure the coherence of multi-channel radio frequency pumping signal;
Multichannel complex modulation and phase coherence pumping signal conditioning unit adopt the conditioning channel module of several miniaturizations based on PXI bus amplification/attenuation/up-conversion able to programme, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, meet the differentiation requirement of different demand for exciting signal frequency scope, power bracket characteristic;
Multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit and adopts some external dual directional coupler modules, described dual directional coupler module is carried out design according to the requirement of different technologies index and is realized, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, meet the differentiation requirement of different demand for pumping signal, reflex response signal extraction characteristic;
Multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit according to adopting some external dual directional couplers and load blocks, described dual directional coupler and load blocks are carried out design according to the requirement of different technologies index and are realized, by with multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and the adaptability that reflects extraction unit configures, meet the differentiation requirement of different demand for characteristics such as transmission response signal extractions,
Multichannel complex modulation and phase coherence response signal receive the conditioning channel module that conditioning unit adopts some decay/down-conversions, to be separated with phase coherence response signal and the adaptability of transmitting extraction unit configures by be separated with phase coherence pumping signal with multichannel complex modulation and to reflect extraction unit, multichannel complex modulation, receive be coupled from reference of corresponding units, reflection coupling and transmission coupled signal, meet different demand for excitation reception, the differentiation requirement responding the characteristics such as reception;
Multichannel complex modulation and phase coherence response test analytic unit adopt some multichannel digital instrument modules, configured by the adaptability receiving conditioning unit with multichannel complex modulation and phase coherence response signal, meet different demand for the differentiation requirement of excitation with response test analytical characteristics.
Alternatively, method of testing of the present invention also comprises: obtain reference coupled signal R, the reflection coupling signal A under real-time collaborative mode of operation and transmit amplitude and the phase information of coupled signal B, computing formula according to scattering parameter: S11=A/R, S21=B/R, obtains the scattering parameter of multiple channel test object under complex modulation and phase coherence pattern.
Alternatively, the detection calibration of described scattering parameter is based on 12 VECs, respectively test open circuit device, short-circuiting device, load, thru calibration part, by calculating the error coefficient extracting each error term, carry out correction computing when reality is tested, obtain test result.
The invention has the beneficial effects as follows:
(1) pumping signal of testing no longer is limited to the inherent technology characteristic of vector network analyzer, can meet different actual Test Application demand for when under multichannel complex modulation and phase coherence pattern, scattering parameter is tested to the technical requirement such as the multichannel of pumping signal, complex modulation, phase coherence, excitation behavior be configurable;
(2) multichannel complex modulation and phase coherent signal occur no longer by encouraging the mode of holding and increasing multichannel homophase merit and dividing, pumping signal passage insertion loss is little and meet the requirement of test to exciting power scope by nursing one's health, excitation interchannel isolation can reach greatly calibration effect and test result preferably, simultaneously without the need to dividing the systematic error of introducing to carry out error correction by comparatively complicated calibration steps to multichannel homophase merit, the relevant art requirement of actual Test Application demand can be met;
(3) the inherent technology characteristic being no longer limited to vector network analyzer is extracted in the Signal separator tested and reflection/transmission, can to meet when different actual Test Application demand is tested with scattering parameter under phase coherence pattern for multichannel complex modulation encouraging, response signal is separated and reflects/transmit the technical requirements such as multichannel, the separated/extracted performance extracted be configurable;
(4) response signal of testing receives the inherent technology characteristic being no longer limited to vector network analyzer, can meet when scattering parameter under multichannel complex modulation and phase coherence pattern is tested technical requirements such as the multichannel of test response signal, complex modulation, phase coherence, response performance are configurable;
(5) multichannel complex modulation and phase coherence test analysis no longer adopt receiving terminal to increase diverter switch to carry out timesharing and patrol the mode surveying each passage scattering parameter of tested object, there is the real-time supporting reception test under complex modulation pattern and multi-channel synchronous test, can carry out each interchannel synchronous consistency contrast test, the test performance provided can meet the relevant art requirement of actual Test Application demand simultaneously;
(6) the calibration effect of testing no longer is limited to the claimed range of the required state of the art of vector network analyzer calibration, adopt and Excitation and response Signal separator and extraction unit are carried out external flexible deployment mode, by removing correction algorithm based on the calibration of scattering parameter cascade, can by test port in practical application and to there is path between detection calibration face (connecting test object) long, the unconventional influencing factors such as mismatch is many effectively reduce or remove, simultaneously can by the configurable technical characteristic expansion realizing Signal separator and extraction of performance, meet the high requirement of different application demand for good alignment effect,
(7) application tested no longer is limited to the inherent technology characteristic (as overall dimension, weight and the fixing and performance index etc. of not configurable adjustment) of vector network analyzer conventional individual framework, can meet complex modulation and the larger multichannel scattering parameter of phase coherence pattern lower channel and multi-parameters test demand by the mode of cascade and flexible configuration;
(8) with adopt the vector network analyzer of conventional individual framework and pattern by compared with the mode that increases resource quantity support on year-on-year basis and expanded scale by concurrent testing, adopt test circuit provided by the invention and method of testing, testing equipment all has obvious advantage in the economy and convenience etc. of overall dimension, weight, test function, performance index, testing efficiency, application deployment;
(9) testing equipment has open platform architecture, and extensibility is good, flexible configuration, can provide the complex modulation and phase coherence pattern multichannel scattering parameter power of test that meet corresponding requirements according to different actual Test Application demands;
(10) not only can support that extrinsic vectors is modulated, complex modulation pumping signal is generated based on User Defined waveform, external modulation input isotype, and all phase coherence is realized from baseband signal to radio-frequency carrier signal, and each channel phases can realize real time calibration and correction to digitally, between multi channel signals, coherence and stability are all good;
(11) testing equipment can realize the expansion of Test Application scale comparatively easily by the mode of cascade and flexible combination, with meet complex modulation and phase coherence pattern lower channel larger time multichannel scattering parameter and the testing requirement of multi-parameter;
(12) testing equipment has " platform architecture, the one-machine-multi-function " feature of " software radio ", by loading different testing softwares, when basic hardware platform system is constant, the various test functions of the multi-parameter such as scattering parameter or frequency domain/time domain can be realized.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram being applicable to the multichannel scattering parameter test circuit of complex modulation and phase coherence system of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of multichannel scattering parameter test circuit being applicable to complex modulation and phase coherence system of the present invention, comprise: main control computer, PXI cabinet, share local oscillation signal generating unit, share clock reference generating unit, multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit, multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit etc.
Wherein, main control computer loads corresponding test analysis software, realizes man-machine interaction, shows various information state, and realizes computing and the process of the multi-parameter such as scattering parameter and frequency domain/time domain.Main control computer, by PXI cabinet and core bus, receives conditioning unit, multichannel complex modulation and phase coherence response test analytic unit to multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal, share local oscillation signal generating unit, shares clock reference generating unit Collaborative Control in the framework of PXI bus.
Adopt test circuit provided by the invention, testing equipment has open platform architecture, extensibility is good, flexible configuration, can provide the complex modulation and phase coherence pattern multichannel scattering parameter power of test that meet corresponding requirements according to different actual Test Application demands, simultaneously, Test Application is no longer limited to the inherent technology characteristic of vector network analyzer conventional individual framework (as overall dimension, weight and the fixing and performance index etc. of not configurable adjustment), complex modulation and the larger multichannel scattering parameter of phase coherence pattern lower channel and multi-parameters test demand can be met by the extended mode of cascade and flexible combination, pass through to increase resource quantity on year-on-year basis with adopting the vector network analyzer of conventional individual framework and pattern and support that concurrent testing is expanded compared with the mode of scale, testing equipment is in overall dimension, weight, test function, performance index, testing efficiency, the aspects such as the economy of application deployment and convenience all have obvious advantage, with the exception of this, " platform architecture, one-machine-multi-function " feature that testing equipment has " software radio ", by loading different testing softwares, when basic hardware platform system is constant, the various test functions of the multi-parameter such as scattering parameter or frequency domain/time domain can be realized.
Share clock reference generating unit and adopt one based on the miniaturized module of PXI bus, for multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, share local oscillation signal generating unit provide same clock reference and triggering synchronous clock signal, to ensure the coherence of each unit on time/frequency.
Adopt test circuit provided by the invention, clock reference and the synchronous triggering of each functional unit of testing equipment all come from same clock reference, ensureing outside the coherence of each functional unit on time/frequency, the synchronous synergetic of observing and controlling sequential and measuring stability preferably when can also realize Test Application.
Share local oscillation signal generating unit and adopt two based on the miniaturized module of PXI bus, be locked on shared clock reference signal, be respectively multichannel complex modulation and phase coherence pumping signal generating unit and multichannel complex modulation and phase coherence response signal to receive conditioning unit and provide radio-frequency carrier and local oscillation signal, to ensure the complex modulation that corresponding units outputs signal and coherence.
Adopt test circuit provided by the invention, testing equipment not only can support that extrinsic vectors is modulated, complex modulation pumping signal is generated based on User Defined waveform, external modulation input isotype, and can phase coherence be realized from baseband signal to radio-frequency carrier signal, simultaneously each channel phases can carry out real time calibration and correction to digitally, to obtain phase coherence truly and all good multichannel complex modulation pumping signal of stability.
Multichannel complex modulation and phase coherent signal generating unit adopt several based on the miniaturized vector signal generation module of PXI bus according to practical application request, the inner baseband signal of modules occurs to adopt same shared clock reference and triggered synchronous mode, to ensure the coherence of multichannel baseband signal, and the inner baseband signal of modules can realize random waveform and occur; Meanwhile, the inner Vector Modulation passage of modules adopts same shared local oscillator, and realizes real-time adjustment to phase place and correction, to ensure the coherence of multi-channel radio frequency pumping signal by Vector Modulation and control software design; And multichannel complex modulation and phase coherent signal generating unit support that extrinsic vectors is modulated, generate complex modulation pumping signal based on User Defined waveform, external modulation input isotype.
Adopt test circuit provided by the invention, the pumping signal of testing equipment is no longer limited to the inherent technology characteristic of vector network analyzer, can meet different actual Test Application demand for when under multichannel complex modulation and phase coherence pattern, scattering parameter is tested to the technical requirement such as the multichannel of pumping signal, complex modulation, phase coherence, excitation behavior be configurable; Simultaneously, no longer by increasing the traditional approach that multichannel homophase merit is divided at excitation end, pumping signal passage insertion loss is little and meet the requirement of test to exciting power scope by signal condition, excitation interchannel isolation can reach greatly calibration effect and test result preferably, simultaneously without the need to dividing the systematic error of introducing to carry out error correction by comparatively complicated calibration steps to multichannel homophase merit, the relevant art requirement of actual Test Application demand can be met.
Multichannel complex modulation and phase coherence pumping signal conditioning unit adopt the conditioning channel module of several miniaturizations based on PXI bus amplification/attenuation/up-conversion able to programme according to practical application request, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, meet the differentiation requirement of different demand for characteristics such as exciting signal frequency scope, power brackets.
Adopt test circuit provided by the invention, the conditioning of testing equipment pumping signal is no longer limited to the inherent technology characteristic of vector network analyzer, can meet when different actual Test Application demand is tested from scattering parameter under phase coherence pattern for multichannel complex modulation the different requirements of pumping signal in power bracket, spectral characteristic etc., realize the adaptation of measuring technology characteristic and application by the visual feelings configuration of performance and expand object, meeting the testing requirement of different application.
Multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit and adopts some external dual directional coupler modules according to practical application request, these dual directional coupler modules are carried out design according to the requirement of different technologies index and are realized, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, meet the differentiation requirement of different demand for characteristics such as pumping signal, reflex response signal extractions.
Adopt test circuit provided by the invention, the inherent technology characteristic being no longer limited to vector network analyzer is extracted in the Signal separator of testing equipment and reflection/transmission, can meet different actual Test Application demand for when under multichannel complex modulation and phase coherence pattern, scattering parameter is tested to excitation, the multichannel that response signal is separated and reflection/transmission is extracted, the technical requirements such as separated/extracted performance is configurable, simultaneously, correction algorithm is removed in conjunction with the calibration based on scattering parameter cascade, not only can effectively reduce or remove that to there is path between test port and detection calibration face (expansion) long, insertion loss is large, mismatch link is many, combination of channels state is many etc. is difficult to the non-traditional conventional factors impact eliminated by conventional vector network analyzer calibrating mode, and can the adaptation of measuring technology characteristic and application be realized by the visual feelings configuration of performance and expand object, meet the high requirement of different application demand for test accuracy.
Multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit and adopts some external dual directional couplers and load blocks according to practical application request, these dual directional couplers and load blocks are carried out design according to the requirement of different technologies index and are realized, by with multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and the adaptability that reflects extraction unit configures, meet the differentiation requirement of different demand for characteristics such as transmission response signal extractions.
Adopt test circuit provided by the invention, the inherent technology characteristic being no longer limited to vector network analyzer is extracted in the Signal separator of testing equipment and reflection/transmission, can meet different actual Test Application demand for when under multichannel complex modulation and phase coherence pattern, scattering parameter is tested to excitation, the multichannel that response signal is separated and reflection/transmission is extracted, the technical requirements such as separated/extracted performance is configurable, simultaneously, correction algorithm is removed in conjunction with the calibration based on scattering parameter cascade, not only can effectively reduce or remove that to there is path between test port and detection calibration face (expansion) long, insertion loss is large, mismatch link is many, combination of channels state is many etc. is difficult to the non-traditional conventional factors impact eliminated by conventional vector network analyzer calibrating mode, and can the adaptation of measuring technology characteristic and application be realized by the visual feelings configuration of performance and expand object, meet the high requirement of different application demand for test accuracy.
Multichannel complex modulation and phase coherence response signal receive conditioning unit adopts some decay/down-conversions conditioning channel module according to practical application request, to be separated with phase coherence response signal and the adaptability of transmitting extraction unit configures by be separated with phase coherence pumping signal with multichannel complex modulation and to reflect extraction unit, multichannel complex modulation, receive be coupled from reference of corresponding units, reflection coupling and transmission coupled signal, meet different demand for excitation reception, the differentiation requirement responding the characteristics such as reception.
Adopt test circuit provided by the invention, testing equipment is no longer limited to the inherent technology characteristic of vector network analyzer to the conditioning of test response signal, can to meet when different actual Test Application demand is tested from scattering parameter under phase coherence pattern for multichannel complex modulation test response signal in power bracket, receive the different requirements gathered in frequency range etc., realize the adaptation of measuring technology characteristic and application by the visual feelings configuration of performance and expand object, meeting the testing requirement of different application.
Multichannel complex modulation and phase coherence response test analytic unit adopt some multichannel digital instrument modules according to practical application request, configured by the adaptability receiving conditioning unit with multichannel complex modulation and phase coherence response signal, meet the differentiation requirement of different demand for characteristics such as excitation and response test analyses.
Adopt test circuit provided by the invention, testing equipment is no longer limited to the inherent technology characteristic of vector network analyzer to the receiving and analyzing of test response signal, can meet when scattering parameter under multichannel complex modulation and phase coherence pattern is tested the technical requirement such as the multichannel of test response signal, complex modulation, phase coherence, response performance be configurable; Simultaneously, no longer adopt receiving terminal to increase diverter switch and carry out the mode that each passage scattering parameter of the tested object of survey is patrolled in timesharing, there is the real-time supporting reception test under complex modulation pattern and multi-channel synchronous test, and each interchannel synchronous consistency contrast test can be carried out, the test performance provided can meet the relevant art requirement of actual Test Application demand.
By reference coupled signal R (amplitude/phase information), the reflection coupling signal A (amplitude/phase information) under acquisition real-time collaborative mode of operation, transmission coupled signal B (amplitude/phase information), computing formula according to scattering parameter: S11=A/R, S21=B/R, just can obtain the scattering parameter of multiple channel test object under complex modulation and phase coherence pattern.
The detection calibration of usual scattering parameter is based on 12 VECs, test open circuit device, short-circuiting device, load, the calibrating device such as straight-through respectively, by calculating the error coefficient extracting each error term, the modeling analysis of corresponding error and correction computing is carried out depending on feelings, to obtain the higher test result of accuracy when reality is tested.
The calibration effect of test is no longer limited to the claimed range of the required state of the art of vector network analyzer calibration, external flexible deployment mode is carried out in conjunction with Excitation and response Signal separator and extraction unit, by removing correction algorithm based on the calibration of scattering parameter cascade, can by test port in practical application and to there is path between detection calibration face (connecting test object) long, the unconventional influencing factors such as mismatch is many effectively reduce or remove, simultaneously can by the configurable technical characteristic expansion realizing Signal separator and extraction of performance, meet the high requirement of different application demand for good alignment effect.
Based on above-mentioned multichannel scattering parameter test circuit, present invention also offers a kind of multichannel scattering parameter method of testing being applicable to complex modulation and phase coherence system, its operation principle is identical with above-mentioned multichannel scattering parameter test circuit.
Test circuit of the present invention and method of testing, adopt and Excitation and response Signal separator and extraction unit are carried out external flexible deployment mode, by removing correction algorithm based on the calibration of scattering parameter cascade, and the unconventional influencing factors such as path is long, mismatch is many can be there is test port in practical application between detection calibration face (connecting test object) and effectively reduce or remove, the technical characteristic expansion object of Signal separator and extraction can be reached simultaneously by the realization of the visual feelings configuration of performance, meet the high requirement of different application demand for good alignment effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. one kind is applicable to the multichannel scattering parameter test circuit of complex modulation and phase coherence system, it is characterized in that, comprise: main control computer, PXI cabinet, share local oscillation signal generating unit, share clock reference generating unit, multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit, multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit,
Wherein, main control computer, by PXI cabinet and core bus, receives conditioning unit, multichannel complex modulation and phase coherence response test analytic unit to multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal, share local oscillation signal generating unit, shares clock reference generating unit Collaborative Control in the framework of PXI bus;
Share clock reference generating unit for multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, shared local oscillation signal generating unit provides same clock reference and triggering synchronous clock signal, to ensure the coherence of each unit on time/frequency;
Sharing local oscillation signal generating unit is locked on shared clock reference signal, be respectively multichannel complex modulation and phase coherence pumping signal generating unit and multichannel complex modulation and phase coherence response signal to receive conditioning unit and provide radio-frequency carrier and local oscillation signal, to ensure the complex modulation that corresponding units outputs signal and coherence;
Multichannel complex modulation and phase coherent signal generating unit adopt several based on the miniaturized vector signal generation module of PXI bus, the inner baseband signal of modules occurs to adopt same shared clock reference and triggered synchronous mode, to ensure the coherence of multichannel baseband signal; The inner Vector Modulation passage of modules adopts same shared local oscillator, and by Vector Modulation realization to the real-time adjustment of phase place and correction, to ensure the coherence of multi-channel radio frequency pumping signal;
Multichannel complex modulation and phase coherence pumping signal conditioning unit adopt the conditioning channel module of several miniaturizations based on PXI bus amplification/attenuation/up-conversion able to programme, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, meet the differentiation requirement of different demand for exciting signal frequency scope, power bracket characteristic;
Multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit and adopts some external dual directional coupler modules, described dual directional coupler module is carried out design according to the requirement of different technologies index and is realized, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, meet the differentiation requirement of different demand for pumping signal, reflex response signal extraction characteristic;
Multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit and adopts some external dual directional couplers and load blocks, described dual directional coupler and load blocks are carried out design according to the requirement of different technologies index and are realized, by with multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and the adaptability that reflects extraction unit configures, meet the differentiation requirement of different demand for characteristics such as transmission response signal extractions,
Multichannel complex modulation and phase coherence response signal receive the conditioning channel module that conditioning unit adopts some decay/down-conversions, to be separated with phase coherence response signal and the adaptability of transmitting extraction unit configures by be separated with phase coherence pumping signal with multichannel complex modulation and to reflect extraction unit, multichannel complex modulation, receive be coupled from reference of corresponding units, reflection coupling and transmission coupled signal, meet different demand for excitation reception, the differentiation requirement responding the characteristics such as reception;
Multichannel complex modulation and phase coherence response test analytic unit adopt some multichannel digital instrument modules, configured by the adaptability receiving conditioning unit with multichannel complex modulation and phase coherence response signal, meet different demand for the differentiation requirement of excitation with response test analytical characteristics.
2. a kind of multichannel scattering parameter test circuit being applicable to complex modulation and phase coherence system as claimed in claim 1, it is characterized in that, obtain reference coupled signal R, the reflection coupling signal A under real-time collaborative mode of operation and transmit amplitude and the phase information of coupled signal B, computing formula according to scattering parameter: S11=A/R, S21=B/R, obtains the scattering parameter of multiple channel test object under complex modulation and phase coherence pattern.
3. a kind of multichannel scattering parameter test circuit being applicable to complex modulation and phase coherence system as claimed in claim 2, it is characterized in that, the detection calibration of described scattering parameter is based on 12 VECs, test open circuit device, short-circuiting device, load, thru calibration part respectively, by calculating the error coefficient extracting each error term, carry out correction computing when reality is tested, obtain test result.
4. be applicable to a multichannel scattering parameter method of testing for complex modulation and phase coherence system, it is characterized in that,
With main control computer loading application software, by PXI cabinet and core bus, multichannel complex modulation and phase coherence pumping signal generating unit is controlled in the framework of PXI bus, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, share local oscillation signal generating unit, share clock reference generating unit, work in coordination with as object structure to be tested and multichannel is provided, complex modulation, phase coherence pumping signal and environment, and the response signal of real-time reception analysis reflection/transmission, by the computing formula of scattering parameter to obtain the scattering parameter characteristic of object to be tested under complex modulation and phase coherence pattern,
Share clock reference generating unit for multichannel complex modulation and phase coherence pumping signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation and phase coherence response signal receive conditioning unit, multichannel complex modulation and phase coherence response test analytic unit, shared local oscillation signal generating unit provides same clock reference and triggering synchronous clock signal, to ensure the coherence of each unit on time/frequency;
Sharing local oscillation signal generating unit is locked on shared clock reference signal, be respectively multichannel complex modulation and phase coherence pumping signal generating unit and multichannel complex modulation and phase coherence response signal to receive conditioning unit and provide radio-frequency carrier and local oscillation signal, to ensure the complex modulation that corresponding units outputs signal and coherence;
Multichannel complex modulation and phase coherent signal generating unit adopt several based on the miniaturized vector signal generation module of PXI bus, the inner baseband signal of modules occurs to adopt same shared clock reference and triggered synchronous mode, to ensure the coherence of multichannel baseband signal; The inner Vector Modulation passage of modules adopts same shared local oscillator, and by Vector Modulation realization to the real-time adjustment of phase place and correction, to ensure the coherence of multi-channel radio frequency pumping signal;
Multichannel complex modulation and phase coherence pumping signal conditioning unit adopt the conditioning channel module of several miniaturizations based on PXI bus amplification/attenuation/up-conversion able to programme, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, meet the differentiation requirement of different demand for exciting signal frequency scope, power bracket characteristic;
Multichannel complex modulation is separated with phase coherence pumping signal and reflects extraction unit and adopts some external dual directional coupler modules, described dual directional coupler module is carried out design according to the requirement of different technologies index and is realized, by configuring with the adaptability of multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, meet the differentiation requirement of different demand for pumping signal, reflex response signal extraction characteristic;
Multichannel complex modulation is separated with phase coherence response signal and transmits extraction unit according to adopting some external dual directional couplers and load blocks, described dual directional coupler and load blocks are carried out design according to the requirement of different technologies index and are realized, by with multichannel complex modulation and phase coherent signal generating unit, multichannel complex modulation and phase coherence pumping signal conditioning unit, multichannel complex modulation is separated with phase coherence pumping signal and the adaptability that reflects extraction unit configures, meet the differentiation requirement of different demand for characteristics such as transmission response signal extractions,
Multichannel complex modulation and phase coherence response signal receive the conditioning channel module that conditioning unit adopts some decay/down-conversions, to be separated with phase coherence response signal and the adaptability of transmitting extraction unit configures by be separated with phase coherence pumping signal with multichannel complex modulation and to reflect extraction unit, multichannel complex modulation, receive be coupled from reference of corresponding units, reflection coupling and transmission coupled signal, meet different demand for excitation reception, the differentiation requirement responding the characteristics such as reception;
Multichannel complex modulation and phase coherence response test analytic unit adopt some multichannel digital instrument modules, configured by the adaptability receiving conditioning unit with multichannel complex modulation and phase coherence response signal, meet different demand for the differentiation requirement of excitation with response test analytical characteristics.
5. a kind of multichannel scattering parameter method of testing being applicable to complex modulation and phase coherence system as claimed in claim 4, it is characterized in that, obtain reference coupled signal R, the reflection coupling signal A under real-time collaborative mode of operation and transmit amplitude and the phase information of coupled signal B, computing formula according to scattering parameter: S11=A/R, S21=B/R, obtains the scattering parameter of multiple channel test object under complex modulation and phase coherence pattern.
6. a kind of multichannel scattering parameter method of testing being applicable to complex modulation and phase coherence system as claimed in claim 5, it is characterized in that, the detection calibration of described scattering parameter is based on 12 VECs, test open circuit device, short-circuiting device, load, thru calibration part respectively, by calculating the error coefficient extracting each error term, carry out correction computing when reality is tested, obtain test result.
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