CN103138845B - Amplitude phase characteristic test method for down-conversion reception channel of ultra-wide band synthetic aperture radar (SAR) receiver - Google Patents
Amplitude phase characteristic test method for down-conversion reception channel of ultra-wide band synthetic aperture radar (SAR) receiver Download PDFInfo
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Abstract
The invention discloses an amplitude phase characteristic test method for a down-conversion reception channel of an ultra-wide band synthetic aperture radar (SAR) receiver and relates to an SAR system testing technology. The amplitude phase characteristic test method comprises a first step of establishing a parametric mixer and connecting a vector network analyzer; a second step of performing standard single-port correction on two ports of the vector network analyzer respectively within an input frequency range and an output frequency range of the tested down-conversion reception channel; a third step of establishing a calibration mixer and performing representation of the calibration mixer; a fourth step of utilizing the calibration mixer to perform straight-through calibration; and a fifth step of testing amplitude phase characteristics of the down-conversion reception channel. The method is mainly used for measuring amplitude phase frequency characteristics of the down-conversion reception channel of the synthetic aperture radar multichannel receiver and has the advantages of being high in measuring precision and simple, convenient and fast to achieve, and necessary means are provided for accurate extraction and compensation of SAR system amplitude phase errors.
Description
Technical field
The present invention relates to synthetic aperture radar (SAR) system testing technical field, particularly a kind of UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing.
Background technology
Synthetic aperture radar (SAR) is a kind of microwave remote sensing means of carrying out imaging observation on a surface target.Having can the advantage of round-the-clock all weather operations, is thus widely used in the fields such as national defence, natural resources exploration, disaster monitoring.Along with constantly sending out of SAR imaging technique is stood, the resolution of SAR imaging is also improving constantly.UWB SARt can realize the resolution being better than 0.1m, can realize very meticulous imaging, all have very important significance in military affairs or in civilian to ground.
But UWB SARt needs the linear FM signal transmitting and receiving the non-constant width of absolute bandwidth, the so high signal of acquisition bandwidth is difficult to current hardware technology level, therefore need to be received by multichannel, namely the signal utilizing filtering frequency conversion assembly that Received signal strength is divided into many bandwidth less gathers, and the mode of being synthesized by frequency band again when imaging recovers broadband signal.But when the down-conversion of carrying out each passage receives, due to the non-ideal characteristic of analog component, can introduce extra amplitude phase error in Received signal strength, passage is more, and the error of introducing is also more.And the band combination of SAR and imaging are very strict for the requirement of signal magnitude-phase characteristics, small error all can cause the severe exacerbation of image quality.Large channel error can have a strong impact on the band combination of post-processing stages, is difficult to realize high-resolution imaging.Therefore the magnitude-phase characteristics of several down-conversion passages to multichannel receiver is needed to test accurately, to ensure that its error introduced to be synthesized at frequency band within the scope that can tolerate.
Three-mixer technology (Three-Mixer technique) measures comparatively conventional a kind of technology for frequency conversion assembly magnitude-phase characteristics at present, this technology utilizes three frequency mixer A, B, C carries out cascade between two, totally three kinds of cascade system (A-B, B-C, A-C), vector network analyzer is utilized to carry out the test of magnitude-phase characteristics respectively for often kind of cascade system, obtain three prescription journeys altogether, the magnitude-phase characteristics of every frequency mixer can be solved after simultaneous, then the frequency mixer of known magnitude-phase characteristics is utilized to carry out cascade with measured device again, namely the frequency response of removing known mixer after obtaining overall response obtains the Frequency Response of measured device.The advantage of this technology is that vector network analyzer used does not need to have frequency deviation function, its shortcoming is operation and calculates comparatively loaded down with trivial details, need craft or program calculation, in addition, the impact that its measuring accuracy of what is more important is subject to mixer ports standing wave is larger, the stage of carrying out three-mixer and characterizing between two, matching properties between frequency mixer can bring systematic error, this error is that this test framework determines, can not be corrected by instrument, this error can be transferred in the result of test at measured piece test phase, affect measuring accuracy, in addition, at measured piece test phase, matching properties between the frequency mixer of measured piece and known frequency response also can produce certain impact to measuring accuracy, especially the accuracy impact for the measurement of phase characteristic is even more serious.
Summary of the invention
The object of the present invention is to provide a kind of method of testing of UWB SARt receiver down-conversion receive path magnitude-phase characteristics, the method can overcome the deficiency that conventional testing techniques exists, and can carry out accurately measuring efficiently to the magnitude-phase characteristics of the down-conversion receive path of UWB SARt multichannel receiver.
For achieving the above object, technical solution of the present invention is:
A kind of UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, it comprises step:
S1) build parametric mixer, and access vector network analyzer;
S2) two ports of vector network analyzer are carried out to the single port calibration of standard respectively in the incoming frequency scope and reference frequency output of tested down-conversion receive path;
S3) build calibration frequency mixer, and carry out the sign of calibrating frequency mixer;
S4) calibration frequency mixer is utilized to carry out thru calibration;
S5) after the position of calibration frequency mixer being carried out substituting with tested down-conversion receive path, the magnitude-phase characteristics of test down-conversion receive path.
Described UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, the parametric mixer in step S1 described in it, adopts general commercial frequency mixer, and its operating frequency range will equal or wider than the frequency range of measured device; The source that parametric mixer is connected to vector network analyzer exports between 1 and receiver R1 input port 2.
Described UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, single port calibration in step S2 described in it, refer in the frequency range before and after measured device frequency conversion, respectively two ports of vector network analyzer opened a way, short circuit, matched load calibration.
Described UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, builds calibration frequency mixer in step S3 described in it, adopt general commercial frequency mixer cascaded low-pass filter to realize.
Described UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, the sign in step S3 described in it, refers to and utilizes a series of characterisitic parameter: input and output matching, magnitude-phase characteristics to be to represent the characteristic of these components and parts.
The method of testing of described UWB SARt receiver down-conversion receive path magnitude-phase characteristics, the process characterized described in it, that the radio-frequency head of calibration frequency mixer is connected with vector network instrument port one, carry out single port calibration to the medium frequency output end of calibration frequency mixer in frequency range after measured device frequency conversion, calibration comprises open circuit, short circuit, matched load; Utilize the network analyzer instrument with vector-mixer calibration function of Agilent company, automatically calculate to characterize by the data of test;
Data after having characterized are deposited in a data file, when needing afterwards, recall direct use.
Described UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, thru calibration in step S4 described in it, refer to and the calibration intermediate frequency delivery outlet of frequency mixer is connected with the port 2 of vector network instrument, the port one of vector network instrument is connected with the rf inputs of calibration frequency mixer simultaneously, complete thru calibration, obtain frequency offset error data.
Described UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, in step S5 described in it, the position of calibration frequency mixer is substituted with tested down-conversion receive path, in the result data of test, deduct frequency offset error data, be the magnitude-phase characteristics of tested down-conversion receive path.
The beneficial effect of the inventive method is:
1) quick to the magnitude-phase characteristics convenient test receiving frequency conversion channel.
This method is in actual mechanical process, after port calibration data and the characterization data of calibration frequency mixer are netted stored in arrow, directly can call characterization data when testing, without the need to recalibrating and sign later, the testing efficiency so just greatly improved, especially for the test of multiple receiver channel.
2) high to the magnitude-phase characteristics measuring accuracy receiving frequency conversion channel.
This method in operating process to additional device used: parametric mixer and calibration mixing frequency characteristic require not high, the systematic error that mixer ports matching properties brings can be got rid of in a calibration process, substantially increase the repeatability of measuring accuracy and test.
Accompanying drawing explanation
Fig. 1 is a kind of UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing flow chart of the present invention;
Fig. 2 is that block diagram built by the testboard of the inventive method;
Fig. 3 is the position view of parametric mixer in the inventive method;
Fig. 4 is that the inventive method alignment frequency mixer characterizes schematic diagram;
Fig. 5 is the calibration frequency mixer thru calibration schematic diagram of the inventive method;
Fig. 6 a is the measurement result of tested down-conversion passage amplitude-frequency characteristic in the inventive method embodiment;
Fig. 6 b is the measurement result of tested down-conversion passage phase-frequency characteristic in the inventive method embodiment.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, a kind of UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing of the present invention is further described.
The inventive method is measured SAR intermediate-frequency receiver down-conversion receive path magnitude-phase characteristics by the vector network analyzer technology of frequency offset error correction, and method step as shown in Figure 1.First illustratively measuring principle and specific requirement, then provides the practical measuring examples utilizing the inventive method.
Method of testing certainty of measurement of the present invention is higher, and it is also comparatively convenient to realize.In the measurements, we wish to carry out Accurate Calibration to each subchannel width phase-frequency characteristic, but because each passage have passed through a down-conversion, namely the input and output frequency of this passage is different, and for different frequencies, phase place can not compare, and the measurement of phase place needs defining on frequently, and this just needs the fixed phase of generation one instantaneous zero-length and zero time delay in theory.In fact we utilize vector network analyzer to be the response relative to this theoretical zero time delay fixed phase to the phase-frequency response receiving lane testing, and the intermediate-freuqncy signal of reference signal and receiver has with frequently, so can carry out the comparison of phase place.The testboard of the vector network analyzer test frequency conversion assembly channel characteristic with frequency offset error correction is utilized to build block diagram as shown in Figure 2.Build test platform to need to use two kinds of frequency mixers: parametric mixer and calibration frequency mixer.Below the effect of two kinds of frequency mixers and requirement are simply set forth:
(1) parametric mixer:
Parametric mixer is mainly used to provide test phase reference, and it is connected on the reference receiver path of network analyzer, exports between receiver R1 input port, as shown in Figure 3 in source.Can see, parametric mixer is connected into the reference channel of network analyzer, becomes a part for network analyzer, and in calibration and test process, parametric mixer is without the need to movement, and it remains on due position.
Requirement for parametric mixer: 1) frequency range: the operating frequency range of parametric mixer should equal or wider than the frequency range of measured device.2) to the requirement of conversion loss and reciprocity: to the conversion loss not requirement of parametric mixer, also do not need that there is reciprocity.Reciprocity refers to that the forward and reverse frequency characteristic of frequency mixer is identical.3) return loss (or claiming port match): parametric mixer port standing wave is the smaller the better, and General Requirements standing wave is less than 2 and just can have satisfied the demand.4) local oscillation power level: the local oscillation power level of parametric mixer all should remain unchanged in system calibration and test period.
(2) frequency mixer is calibrated
Calibration frequency mixer is when building testboard, identical with the position that measured device (DUT) is put, as shown in Figure 5.It is mainly used in calibrating whole test macro, namely carries out frequency offset error correction.That is only have the error information utilizing calibration frequency mixer just can obtain whole system, when carrying out actual frequency conversion module testing, these error informations will be deducted obtain real test result in test result.
Requirement for calibration frequency mixer: 1) frequency range: the frequency range of calibration frequency mixer should be identical with the frequency range of measured piece or wider.2) non-linear due to frequency mixer, can produce at the output port of frequency mixer and need spurious components, these spurious signals may be reflected back frequency mixer from the test port of lattice gauge, with other component mixing, at the signal of required output frequency dot generation mistake, add filter at the input/output port of calibration frequency mixer and such problem can be avoided as far as possible to occur.So in actual applications, normal " mixing+filtering " assembly that adopts is as calibration frequency mixer.3) conversion loss: the conversion loss of calibration frequency mixer should be less than 10dB.4) local oscillation power level: calibration frequency mixer should be identical with local oscillation power used when carrying out thru calibration when characterizing.5) isolation: calibrate frequency mixer local oscillator and the isolation of radio frequency mouth and the isolation of local oscillator and intermediate frequency mouth and be at least 20dB.
Above for parametric mixer and the requirement of calibrating frequency mixer, general commercial frequency mixer can both reach above-mentioned requirements substantially.
Be described below in conjunction with test case.
For a high resolution polarization sensitive synthetic aperture radar system, the receive path of this system will realize centre frequency 14.8GHz, the linear FM signal of bandwidth 3.2GHz receives, be employed herein multichannel receiver technology, radar signal by bandwidth 3.2GHz is divided into eight son bands and receives, each subband bandwidth is 400MHz, eight subbands are all down converted to centre frequency 1GHz, in the IF-FRE of bandwidth 400MHz, eight passage concrete conditions are as follows: wherein RFn represents the incoming frequency of the n-th down-conversion passage, LOn represents the local frequency of the n-th passage, IF represents the IF-FRE that down-conversion passage exports.
First passage: RF1=13.2 ~ 13.6GHz LO1=12.4GHz
Second channel: RF2=13.6 ~ 14.0GHz LO2=12.8GHz
Third channel: RF3=14.0 ~ 14.4GHz LO3=13.2GHz
Four-way: RF4=14.4 ~ 14.8GHz LO4=13.6GHz
Five-channel: RF5=14.8 ~ 15.2GHz LO5=14.0GHz
Hexamermis spp: RF6=15.2 ~ 15.6GHz LO6=14.4GHz
7th passage: RF7=15.6 ~ 16.0GHz LO7=14.8GHz
8th passage: RF8=16.0 ~ 16.4GHz LO8=15.2GHz
Eight passages export: IF=0.8 ~ 1.2GHz
Complete the synthesis of 3.2GHz bandwidth linear frequency modulation signal, with regard to needing, the magnitude-phase characteristics of eight down-conversion passages accurately being tested, namely utilizing this method to measure.
Building of testboard:
(1) parametric mixer model: Chengdu Asia Optical HSPK1812
(2) frequency mixer model is calibrated: Chengdu Asia Optical HSP188
(3) filter: the LC band pass filter of middle electric 13 passband 0.8 ~ 1.2GHz
First be connected on vector network analyzer relevant position with reference to frequency mixer, particular location as shown in Figure 3.
Then two ports of vector network analyzer are carried out to the single port calibration of standard in the incoming frequency scope and reference frequency output of tested n-th tunnel down-conversion receive path; Such as, the incoming frequency scope of first via down-conversion receive path is 13.2-13.6GHz, and reference frequency output is 0.8-1.2GHz.The single port calibration in above-mentioned two frequency ranges is carried out respectively at the port one and port 2 of vowing net.
Afterwards calibration frequency mixer is connected on and vows on the net, complete the sign of calibration frequency mixer, as shown in Figure 4.
The output of calibration frequency mixer is connected on the port 2 of vowing net again, vows that the port one of net still connects the input of calibration frequency mixer, complete thru calibration, as shown in Figure 5.
Finally calibration frequency mixer is taken out from test macro, access tested down-conversion receive path, as shown in Figure 2, thus complete the magnitude-phase characteristics test of frequency conversion assembly.Fig. 6 is the magnitude-phase characteristics result of the 1st down-conversion receive path.
Claims (6)
1. a UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing, is characterized in that, comprise step:
S1) build parametric mixer, and access vector network analyzer;
S2) two ports of vector network analyzer are carried out to the single port calibration of standard respectively in the incoming frequency scope and reference frequency output of tested down-conversion receive path;
S3) build calibration frequency mixer, and carry out the sign of calibrating frequency mixer;
S4) calibration frequency mixer is utilized to carry out thru calibration;
S5) after the position of calibration frequency mixer being carried out substituting with tested down-conversion receive path, the magnitude-phase characteristics of test down-conversion receive path thus complete test;
Wherein, the calibration of single port in described step S2, refer in the frequency range before and after measured device frequency conversion, respectively two ports of vector network analyzer opened a way, short circuit, matched load calibration;
Thru calibration in described step S4, refers to and is connected with the port 2 of vector network instrument by the calibration intermediate frequency delivery outlet of frequency mixer, and the port one of vector network instrument is connected with the rf inputs of calibration frequency mixer simultaneously, completes thru calibration, obtains frequency offset error data.
2. by UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing according to claim 1, it is characterized in that, parametric mixer in described step S1, adopts general commercial frequency mixer, and its operating frequency range will equal or wider than the frequency range of measured device; The source that parametric mixer is connected to vector network analyzer exports between (1) and receiver R1 input port (2).
3. by UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing according to claim 1, it is characterized in that, in described step S3, build calibration frequency mixer, adopt general commercial frequency mixer cascaded low-pass filter to realize.
4. by UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing according to claim 1, it is characterized in that, sign in described step S3, refers to and utilizes a series of characterisitic parameter: input and output matching, magnitude-phase characteristics to be to represent the characteristic of these components and parts.
5. by the method for testing of the UWB SARt receiver down-conversion receive path magnitude-phase characteristics described in claim 1 or 4, it is characterized in that, the process of described sign, that the radio-frequency head of calibration frequency mixer is connected with vector network instrument port one, carry out single port calibration to the medium frequency output end of calibration frequency mixer in frequency range after measured device frequency conversion, calibration comprises open circuit, short circuit, matched load; Utilize the network analyzer with vector-mixer calibration function of Agilent company, automatically calculate to characterize by the data of test;
Data after having characterized are deposited in a data file, when needing afterwards, recall direct use.
6. by UWB SARt receiver down-conversion receive path magnitude-phase characteristics method of testing according to claim 1, it is characterized in that, in described step S5, the position of calibration frequency mixer is substituted with tested down-conversion receive path, in the result data of test, deduct frequency offset error data, be the magnitude-phase characteristics of tested down-conversion receive path.
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| CN103595404B (en) * | 2013-10-29 | 2017-07-11 | 中国电子科技集团公司第四十一研究所 | A kind of frequency mixer Group Delay Measurement circuit and method |
| CN103837767B (en) * | 2013-11-19 | 2016-09-07 | 中国电子科技集团公司第四十一研究所 | A kind of method utilizing arrow net that reciprocal mixing device is carried out characteristic present |
| CN103926555B (en) * | 2013-11-26 | 2017-03-15 | 同方电子科技有限公司 | A kind of method that utilization not rounded signal measuring antenna array receiver machine width is mutually responded |
| DE102014225830A1 (en) * | 2014-12-15 | 2016-06-16 | Robert Bosch Gmbh | Method for calibrating a radar system |
| CN106291132A (en) * | 2016-08-30 | 2017-01-04 | 中国电子科技集团公司第四十研究所 | Embedding on-chip antenna gain test method and system are gone based on single port calibration probe |
| CN106771712B (en) * | 2016-11-15 | 2019-07-26 | 中国电子科技集团公司第四十一研究所 | A kind of frequency converter phase conformance testing device and method |
| CN107104743B (en) * | 2017-05-23 | 2020-06-09 | 中国电子科技集团公司第四十一研究所 | System and method for testing phase consistency between channels of variable frequency T/R assembly |
| CN110708126B (en) * | 2019-10-30 | 2021-07-06 | 中电科思仪科技股份有限公司 | Broadband integrated vector signal modulation device and method |
| CN110988548B (en) * | 2019-12-16 | 2023-06-06 | 航天恒星科技有限公司 | Test method and platform for microwave frequency converter |
| CN112051532A (en) * | 2020-08-04 | 2020-12-08 | 中电科仪器仪表有限公司 | Intermediate frequency calibration method based on vector network analyzer |
| CN112014651B (en) * | 2020-09-03 | 2023-05-16 | 上海无线电设备研究所 | Test method and test system of variable-frequency multi-channel phased array antenna |
| CN115622641B (en) * | 2022-12-01 | 2023-03-10 | 四川九洲电器集团有限责任公司 | Multichannel broadband transceiving channel amplitude and phase calibration method, system, terminal and medium |
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| CN101957444B (en) * | 2010-09-30 | 2012-08-01 | 中国船舶重工集团公司第七二三研究所 | Multichannel radar amplitude and phase automatic correcting method and device |
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