CN101126776A - Broad band and high resolution ratio millimeter wave and sub millimeter wave signal detecting method - Google Patents
Broad band and high resolution ratio millimeter wave and sub millimeter wave signal detecting method Download PDFInfo
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Abstract
The utility model relates to a testing method for broadband and high-resolution millimeter wave and sub millimeter wave signals, with the purpose of providing a testing method of detecting broadband and high-resolution signals at the same time in signal detecting system. The technical proposal is that a testing method for broad-band high-resolution millimeter wave and sub millimeter wave signal combines with the direct incoherent detecting technology and the super heterodyne mixing coherent detecting technology and adopts superconducting SIS as the detector so as to realize fast broad-band signal scanning and high-resolution signal spectrum analysis.
Description
Technical field
The present invention relates to a kind of millimeter wave submillimeter wave signal detecting method, particularly a kind of broadband and high resolving power millimeter wave submillimeter wave signal detecting method.
Background technology
Millimeter wave and submillimeter region according to the difference of signal characteristic frequency spectrum, realize that input has two kinds of methods in applications such as radio astronomy, earth atmosphere environment, radar signal, medicine and biologies at present.One is the direct detection technology, and directly detection technique can realize Broadband Detection, for example detection of continuous spectra signal; It two is the superhet frequency mixing technique, and the superhet frequency mixing technique is applied to realize the high-resolution signal spectral analysis.
Realize that the traditional detector of direct detection is bolometer, bolometer realizes input in the general power mode of direct received signal.Its advantage can realize that exactly (tens GHz realize that to GHz magnitude bandwidth up to a hundred the resolution of spectrum analysis is λ/Δ λ～10 to the low resolution of broadband signal frequency spectrum detection
3), although its shortcoming has certain intermediate-frequency bandwidth (as the bolometer of InSb material as mixing device intermediate-frequency bandwidth in MHz～tens MHz magnitudes) as the mixing device, be difficult to obtain the practical application of effective high-resolution spectrum analysis by the superhet mixing.
Realize that superhet mixing conventional mixer is semiconductor Schottky (schottky) frequency mixer,, high-frequency signal is downconverted to low-frequency range (GHz scope) amplify and arrowband high-resolution spectrum analysis (λ/Δ λ 〉=10 by the superhet mixing
6).The Schottky frequency mixer realizes that it is that operating temperature range is wider that superhet detects advantage, is usually used in working under the room temperature, and frequency of operation is also than broad (the highest can down to 5THz) simultaneously.Its shortcoming is a working sensitivity poor (in the 1000-3000K magnitude) at normal temperatures, and the bigger local oscillation signal source power (mW magnitude) of demand.Semiconductor schottky device poor sensitivity during as direct detector is restricted in the application aspect the broadband signal detection.
At aspects such as radio astronomy, atmosphere detection and wideband radar signal captures, need carry out broadband scanning, and carry out arrowband high-resolution spectrum analysis.Although Bolometer can realize the input in broadband by direct detection, can't satisfy the demand of high-resolution spectrum analysis simultaneously.Similarly, semiconductor Schottky frequency mixer can be realized the analysis of high-resolution frequency spectrum by the superhet frequency mixing technique, but can't satisfy the needs of Broadband Detection simultaneously.
Summary of the invention
In order to overcome in the above-mentioned prior art, the mixed frequency signal detection method can realize the high-resolution spectrum analysis by the superhet frequency mixing technique, can't realize Broadband Detection simultaneously, and the direct detection signal detecting method can be realized Broadband Detection by the direct detection technology, can't realize the deficiency of high-resolution analysis of spectrum simultaneously, the invention provides a kind of new technical scheme, can in a signal detection system, realize the input of broadband and high frequency resolution simultaneously.
The technical scheme of finishing the foregoing invention task is:
A kind of broadband high-resolution millimeter wave submillimeter wave signal detecting method, in conjunction with direct detection non-coherent detection and superhet mixing coherent detection technology, adopt superconduction SIS (Superconductor-Insulator-Superconductor) detector as detector, to realize broadband fast signal scanning and high-resolution signal spectral analysis.
Technical scheme can realize in following system among the present invention: be provided with quick scanning subsystem in broadband and high resolution spectrum processing subsystem in the used detection system of broadband and high resolving power millimeter wave submillimeter wave signal detecting method, wherein, the quick scanning subsystem in described broadband is by Michelson (Michelson) interferometer, broadband beams separation vessel, superconduction SIS detector and data are read and the broader frequency spectrum processing unit is formed, and realizes Broadband Detection by the direct detection mode; Described high-resolution frequency spectrum processing subsystem is amplified by Michelson (Michelson) interferometer, phase-locked local oscillation signal source, broadband beams separation vessel, superconduction SIS detector, low noise intermediate frequency and high-resolution frequency spectrum processing unit, arrowband is formed, and realizes arrowband high-resolution input by superhet mixing mode; In two subsystems, shared Michelson (Michelson) interferometer, broadband beams separation vessel and superconduction SIS detector.
This system carries out implementing when broadband signal scans fast following steps:
Signal enters Michelson (Michelson) interferometer, at the beam splitter place, is divided into two wave beams, after two wave beams pass through movable level crossing and fixed pan mirror reflection, converges at the beam splitter place again;
Superconduction SIS detector detects through the broadband beams separation vessel and converges the later wave beam that converges: the position that changes the movable level crossing in Michelson (Michelson) interferometer, make that the distance of movable level crossing and fixed pan mirror and beam splitter is unequal, produce optical path difference between two wave beams, thereby two wave beams interfere;
By the position of the movable level crossing of continuous change, superconduction SIS detector detects the interference ripple of corresponding relation between two wave beam interference strengths and the optical path difference;
The data sensing element reads the fringe intensity of each movable level crossing position correspondence from superconduction SIS probe unit, obtain the image of fringe intensity and corresponding optical path difference;
The interferogram that previous step is obtained carries out Fourier transform, tries to achieve broader frequency spectrum, obtains the spectral response of signal and superconduction SIS detector;
Contrast superconduction SIS frequency response situation, obtain the spectral characteristic of broadband signal, realize the Broadband Detection of direct detection mode;
When carrying out arrowband high-resolution input, this system implements following steps:
Signal is adjusted movable level crossing through Michelson (Michelson) interferometer, makes that signal still is zero through the optical path difference of latter two wave beam of Michelson (Michelson) interferometer;
Above-mentioned signal through Michelson (Michelson) interferometer path, again through the transmission of broadband beams separation vessel, with the phase-locked local oscillation signal source that configures frequency and power after the reflection of broadband beams separation vessel, together be pooled to superconduction SIS detector;
Signal to be detected and local oscillation signal obtain intermediate-freuqncy signal by the mixing of superconduction SIS frequency mixer, the difference between signal promptly to be detected and the local oscillation signal;
Superconduction SIS frequency mixer mixing output is amplified through low noise intermediate frequency amplifying unit earlier, carry out frequency spectrum processing by high-resolution frequency spectrum processing unit, arrowband again, comprise that the centering discharge signal carries out Fourier transform, calculates and its power spectrum of integration, realizes the arrowband high-resolution signal spectral analysis of superhet mixing mode.
The effect that the present invention is useful is, adopts high sensitivity superconduction SIS detector, and superconduction SIS detector has very wide radio frequency bandwidth (100GHz magnitude even more wide bandwidth).When direct detection, the bandwidth of measured signal is limited by the radio frequency bandwidth of superconduction SIS detector mainly, so the result of direct detection is carried out spectrum analysis, the low signal spectrum of differentiating in the broadband as a result that obtains, the intermediate-frequency bandwidth of superconduction SIS detector, it is much smaller to compare its radio frequency bandwidth.When the superhet mixing, the signal bandwidth that back end signal is handled, be subjected to the intermediate-frequency bandwidth of superconduction SIS detector and the processing bandwidth of low temperature amplifying device to limit (several GHz-10GHz magnitude) jointly, so the intermediate frequency after the mixing is carried out frequency spectrum processing, obviously than the direct detection mode, what realize is the spectrum analysis of arrowband, in both cases, even counting of the fast fourier transform (the digital processing form of Fourier transform) that adopts is all the same, the frequency resolution that obtains of superhet mixing mode then, much higher than direct detection mode is greater than 10
3So what direct detection was realized is the low spectrum analysis of differentiating in broadband, what superhet mixing mode obtained is the high-resolution spectrum analysis in arrowband.According to different needs, superconduction SIS detector output signal is adopted above-mentioned different analyzing and processing, realize quick scanning in broadband and arrowband high-resolution frequency spectrum detection that millimeter wave two kinds of detection modes of submillimeter wave band signal (coherent detection and non-coherent detection) combine.
Description of drawings
Fig. 1 is the system chart of the embodiment of the invention;
Fig. 2 is the Michelson interferometer structure synoptic diagram of the embodiment of the invention
Embodiment
As shown in Figure 1, broadband and high resolving power millimeter wave submillimeter wave signal detection system, be provided with quick scanning subsystem 1 in broadband and high resolution spectrum processing subsystem 2, wherein, the quick scanning subsystem 1 in broadband is by Michelson interferometer 3, broadband beams separation vessel 4, superconduction SIS detector 5 and data are read and broader frequency spectrum processing unit 6 is formed, and realizes Broadband Detection by the direct detection mode; High-resolution frequency spectrum processing subsystem 2 is made up of Michelson interferometer 3, phase-locked local oscillation signal source 12, broadband beams separation vessel 4, superconduction SIS detector 5, the amplification 7 of low noise intermediate frequency and high-resolution frequency spectrum processing unit, arrowband 8, realizes arrowband high-resolution input by superhet mixing mode; In two subsystems, shared Michelson interferometer 3, broadband beams separation vessel 4 and superconduction SIS detector 5
As shown in Figure 2, the Michelson interferometer is made up of fixed pan mirror (Fixed Mirror) 9, beam splitter 11 (Beamsplitter) and movable level crossing (Moveable Mirror) 10.
The realization of Broadband Detection may further comprise the steps:
Signal enters Michelson (Michelson) interferometer 3, at beam splitter 11 places, is divided into two wave beams;
After two reflections of wave beam, converge at beam splitter 11 places again through movable level crossing 10 and fixed pan mirror 9;
Superconduction SIS detector 5 detects through converging the later wave beam that converges: the position that changes the movable level crossing 10 in Michelson (Michelson) interferometer 1, make that movable level crossing 10 and fixed pan mirror 9 are unequal with the distance of beam splitter 11, produce optical path difference between two wave beams, thereby two wave beams interfere;
By the position of the movable level crossing 10 of continuous change, superconduction SIS detector 5 just can detect the interference ripple of corresponding relation between two wave beam interference strengths and the optical path difference.
Reading of interference fringe: change movable level crossing 10 positions, data are read and broader frequency spectrum processing unit 6 reads corresponding this moment fringe intensity from superconduction SIS detector 5, obtain fringe intensity and the corresponding optical path difference (position of mobile movable level crossing, can obtain different optical path differences), i.e. interferogram;
Again interference fringe being carried out broader frequency spectrum handles, obtain the spectral response of signal and superconduction SIS detector, under known superconduction SIS frequency response situation, can further obtain the spectral characteristic of broadband signal, promptly calculate broadband signal ' irradiation ' detector and cause its voltage or the voltage of electric current variation or the frequency spectrum of the magnitude of current, realize the broadband signal analysis of direct detection mode.
The step of interested frequency being carried out arrowband high-resolution signal spectral analysis is as follows:
Signal in order to obtain quite good detecting intensity, is adjusted movable level crossing 10 through Michelson interferometer 3, makes that signal still is zero through the optical path difference of Michelson (Michelson) interferometer 3 latter two wave beams; Although signal is two wave beams stacks after by Michelson (Michelson) interferometer, when optical path difference is adjusted into zero, then do not have an interference effect, signal amplitude is not subdued, and at this moment signal is still thought single wave beam;
Through 4 transmissions of broadband beams separation vessel, reflect through broadband beams separation vessel 4 again, together be pooled to superconduction SIS detector 5 with the phase-locked local oscillation signal source 12 that configures required frequency and power;
Signal to be detected and local oscillation signal obtain the difference-intermediate-freuqncy signal between signal to be detected and the local oscillation signal by superconduction SIS frequency mixer mixing 5;
Intermediate-freuqncy signal is amplified through low noise intermediate frequency amplifying unit 7 earlier, carries out frequency spectrum processing by high-resolution frequency spectrum processing unit, arrowband 8 again, has realized the arrowband high-resolution signal spectral analysis of superhet mixing mode.
Claims (3)
1. broadband high-resolution millimeter wave submillimeter wave signal detecting method, it is characterized in that, in conjunction with direct detection non-coherent detection and superhet mixing coherent detection technology, adopt superconduction SIS detector as detector, to realize broadband fast signal scanning and high-resolution signal spectral analysis.
2. signal detecting method according to claim 1, be provided with quick scanning subsystem in broadband and high resolution spectrum processing subsystem in the used detection system, wherein, the quick scanning subsystem in described broadband is by Michelson interferometer, broadband beams separation vessel, superconduction SIS detector and data are read and the broader frequency spectrum processing unit is formed, and realizes Broadband Detection by the direct detection mode; Described high-resolution frequency spectrum processing subsystem is amplified by Michelson interferometer, phase-locked local oscillation signal source, broadband beams separation vessel, superconduction SIS detector, low noise intermediate frequency and high-resolution frequency spectrum processing unit, arrowband is formed, and realizes arrowband high-resolution input by superhet mixing mode; In two subsystems, shared Michelson interferometer, broadband beams separation vessel and superconduction SIS detector; It is characterized in that,
The fast signal scanning of described realization broadband may further comprise the steps:
Signal enters the Michelson interferometer, at the beam splitter place, is divided into two wave beams, after two reflections of wave beam through movable level crossing and fixed pan mirror, converges at the beam splitter place again;
Superconduction SIS detector detects through the broadband beams separation vessel and converges the later wave beam that converges: the position that changes the movable level crossing in the Michelson interferometer, make that the distance of movable level crossing and fixed pan mirror and beam splitter is unequal, produce optical path difference between two wave beams, thereby two wave beams interfere;
By the position of the movable level crossing of continuous change, superconduction SIS detector detects the interference ripple of corresponding relation between two wave beam interference strengths and the optical path difference;
The interference ripple of corresponding relation between intensity and the optical path difference;
The data sensing element reads the fringe intensity of each movable level crossing position correspondence from superconduction SIS probe unit, obtain the image of fringe intensity and corresponding optical path difference;
The interferogram that previous step is obtained carries out Fourier transform, obtains the spectral response of signal and superconduction SIS detector;
Contrast superconduction SIS frequency response situation, obtain the spectral characteristic of broadband signal, realize the broadband signal analysis of direct detection mode.
3. detection method according to claim 2 is characterized in that: described arrowband high-resolution input may further comprise the steps:
Signal is adjusted movable level crossing through Michelson interferometer, makes that signal still is zero through the optical path difference of latter two wave beam of Michelson interferometer;
Above-mentioned signal through Michelson interferometer path is again through the transmission of broadband beams separation vessel, with the phase-locked local oscillation signal source that configures frequency and power after the reflection of broadband beams separation vessel, together be pooled to superconduction SIS detector;
Signal to be detected and local oscillation signal obtain intermediate-freuqncy signal by the mixing of superconduction SIS frequency mixer, the difference between signal promptly to be detected and the local oscillation signal;
Superconduction SIS frequency mixer mixing output is amplified through low noise intermediate frequency amplifying unit earlier, carry out frequency spectrum processing by high-resolution frequency spectrum processing unit again, comprise that the centering discharge signal carries out Fourier transform, calculates and its power spectrum of integration, realizes the arrowband high-resolution signal spectral analysis of superhet mixing mode.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN105510724A (en) * | 2015-11-30 | 2016-04-20 | 中国科学院紫金山天文台 | Magnetic field adjustment and control-based high-stability terahertz super-heat conduction electronic coherent detector system |
| CN110245384A (en) * | 2019-05-16 | 2019-09-17 | 中国工程物理研究院激光聚变研究中心 | A kind of parasitic striped removing method and device based on characteristic frequency spectrum bandreject filtering |
| CN113589037A (en) * | 2021-09-11 | 2021-11-02 | 北京芯同汇科技有限公司 | Frequency spectrum detection device and detection method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5530927A (en) * | 1994-07-01 | 1996-06-25 | The United States Of America As Represented By The Secretary Of The Air Force | Doubly balanced superconductive mixer network |
| CN2565155Y (en) * | 2002-08-06 | 2003-08-06 | 东南大学 | Heterodyne space feed mm wave focal plane array imaging structure |
| CN1158537C (en) * | 2002-08-06 | 2004-07-21 | 东南大学 | Heterodyne millimetric wave space electricity-feeding transmission method and its focal array imaging structure |
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2007
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN103134983B (en) * | 2011-11-26 | 2016-03-30 | 中国科学院紫金山天文台 | Based on Terahertz related detection system and the method for single frequency mixer |
| CN105510724A (en) * | 2015-11-30 | 2016-04-20 | 中国科学院紫金山天文台 | Magnetic field adjustment and control-based high-stability terahertz super-heat conduction electronic coherent detector system |
| CN110245384A (en) * | 2019-05-16 | 2019-09-17 | 中国工程物理研究院激光聚变研究中心 | A kind of parasitic striped removing method and device based on characteristic frequency spectrum bandreject filtering |
| CN110245384B (en) * | 2019-05-16 | 2022-03-08 | 中国工程物理研究院激光聚变研究中心 | Parasitic stripe elimination method and device based on characteristic spectrum band elimination filtering |
| CN113589037A (en) * | 2021-09-11 | 2021-11-02 | 北京芯同汇科技有限公司 | Frequency spectrum detection device and detection method |
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