CN103884922A - Measuring device and method for Terahertz vector field shape of single receiver - Google Patents
Measuring device and method for Terahertz vector field shape of single receiver Download PDFInfo
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Abstract
The invention discloses a measuring device and method for the Terahertz vector field shape of a single receiver, and relates to the technical field of Terahertz measurement. The measuring device comprises two signal channels, namely the testing channel and the reference channel. In the testing channel, an emission frequency synthesizer is connected with a frequency doubling amplifying module, a radioactive source to be measured and a receiver in sequence through a directional coupler, wherein the receiver can receive radio frequency signals and perform frequency mixing. In the reference channel, the emission frequency synthesizer and a local-oscillation frequency synthesizer are respectively connected with a microwave mixer through the other output port of the directional coupler. The intermediate frequency output port of the receiver and the intermediate frequency output port of the microwave mixer are respectively connected with a dual-channel A/D acquisition card. The measuring device and method have the advantages that measurement of the Terahertz vector field shape can be completed, the phase measurement accuracy of the measuring device is equivalent to that of the scheme containing double receivers, building cost is low, and system configuration is more flexible.
Description
Technical field
The present invention relates to the technical field that Terahertz is measured, relate in particular to the device and method of measuring Terahertz frequency range (containing millimeter wave, submillimeter wave wave band) vector field shape, specifically, is a kind of single-receiver Terahertz vector field shape measurement mechanism and measuring method thereof.
Background technology
The measurement of vector field shape refers to amplitude and the PHASE DISTRIBUTION of measuring electromagnetic field simultaneously.Measure by the two-dimensional vector field shape on a certain fixed pan, the three dimensional field of radiation source to be measured in full extent of space of can deriving distributes and propagation characteristic, and therefore this measuring method is important measurement means in the fields such as reflector antenna, Feed Horn, microwave and millimeter wave imaging system and collimator optical system.In order to obtain the PHASE DISTRIBUTION of to be measured, need to provide a road phase reference signal for measuring-signal, this signal does not change with the variation of spacescan position, and is only used for characterizing the random phase fluctuation that in transmitter and receiver, oscillator produces.In the phase place of measuring-signal, deduct this part random phase fluctuation, can obtain to be measured real PHASE DISTRIBUTION information.In traditional microwave and millimeter wave vector field shape measuring system, measuring-signal and reference signal provide (as shown in Figure 1) by two receivers respectively, wherein a receiver receives the signal from measurement field, and another receiver is directly connected with transmitter by directional coupler.Two receivers share same local vibration source, realize phase place relevant.In the higher submillimeter wave of frequency and Terahertz frequency range, in principle, still can adopt said system to form, but in these frequency ranges, the output power of transmitter is generally lower, the cost of receiver is higher, and the relative low-frequency range of noise temperature significantly raises, usually can not meet vector field shape and measure required sensitivity and dynamic range requirement.Adopt high sensitivity superconduction receiver can obtain than semiconductor and receive the low more than magnitude noise temperature of machine, realize high-precision shape and measure, but its shortcoming is that volume and power consumption are larger, cost costliness.
Summary of the invention
Technical matters to be solved by this invention is for the above-mentioned state of the art, and provides one only to use a receiver can complete the shape measurement of Terahertz vector field and phase measurement accuracy is suitable with double-receiver scheme, construction cost is cheap, system configuration single-receiver Terahertz vector field shape measurement mechanism and measuring method thereof more flexibly.
The present invention solves the problems of the technologies described above adopted technical scheme:
Single-receiver Terahertz vector field shape measurement mechanism, comprise that transmitting is frequently combined, local oscillator is combined frequently, test channel and reference channel, in test channel, the receiver that is connected with frequency multiplication amplification module, radiation source to be measured and energy received RF signal mixing by directional coupler in turn is combined in transmitting frequently; In reference channel, transmitting is combined frequently and local oscillator is frequently combined and is all connected with microwave mixer by another output port of directional coupler.The medium frequency output end mouth of receiver and microwave mixer is all connected with capture card.
For optimizing technique scheme, the concrete measure of taking also comprises:
Above-mentioned capture card is double channel A/D capture card.
Above-mentioned directional coupler includes the first directional coupler and the second directional coupler, transmitting is frequently combined and is connected with the first directional coupler, local oscillator is frequently combined and is connected with the second directional coupler, the first directional coupler and the second directional coupler have included two output ports, and these two ports are communicated with respectively test channel and reference channel.
Above-mentioned transmitting is combined frequently, local oscillator is frequently combined between capture card and interconnected by 10MHz reference signal line.
The above-mentioned method of passing through single-receiver Terahertz vector field shape measurement mechanism measurement Terahertz vector field shape, comprises the following steps:
Step 1, transmitting are frequently combined with local oscillator and are frequently combined and be connected with a directional coupler respectively, and two output channels of directional coupler are respectively as test and reference channel, and transmitting is frequently combined the microwave signal frequency of sending and is designated as
, local oscillator is frequently combined the microwave signal frequency of sending and is designated as
;
Step 3, in reference channel, the signal that transmitting is frequently combined and local oscillator is combined output is frequently sent in microwave mixer, generating reference intermediate-freuqncy signal, its frequency is
=
-
;
The flow process that time-domain digital signal to test channel in above-mentioned step 5 and the time-domain digital signal of reference channel carry out software digital signal processing is:
1) right respectively
x t (
t) and
x r (
t) carry out Fourier transform, obtain testing the frequency spectrum of intermediate frequency
x t (
f) and with reference to the frequency spectrum of intermediate frequency
x r (
f);
2) extract the amplitude of test signal intermediate frequency spectrum from test
and phase place
;
3) from the amplitude with reference to extracting reference signal intermediate frequency spectrum
and phase place
;
4) phase place of calculating after test signal is proofreaied and correct is
-m (
).
The sample frequency of capture card 8 in above-mentioned step 4
>
.
Single-receiver Terahertz vector field shape measurement mechanism of the present invention is the vector field shape measuring system based on single receiver, this system schema is based on high-speed a/d analog input card, and utilize digital signal processing to realize high-precision phase position reference signal, system forms convenient, flexible, and phase measurement accuracy is suitable with double-receiver scheme.High-speed a/d analog input card is double channels acquisition board, and two passages are defined as respectively passage 1 and passage 2.Transmitting of the present invention is frequently combined with comprehensive respectively with one directional coupler of local oscillator frequency or power splitter and is connected, and two output channels of directional coupler are respectively as test and reference channel.Measuring in passage, launch the microwave signal of comprehensive output frequently after many times frequency multiplication amplifies, generation Terahertz radiofrequency signal, after receiver receives also mixing, generates test intermediate-freuqncy signal, and its frequency is
=m (
-
), in reference channel, launch the signal of frequently combining with the comprehensive output of local oscillator frequency and send in a microwave mixer, generating reference intermediate-freuqncy signal, its frequency is
=
-
.Test and carry out A/D sampling with reference to passage 1 and passage 2 that intermediate-freuqncy signal is sent into respectively dual channel high speed A/D capture card, obtains the time-domain digital signal of test channel and reference channel
x t (
t) and
x r (
t).Two-way intermediate frequency time-domain signal is carried out to software digital signal processing, finally extract amplitude and the phase information of test channel.For avoiding aliasing, the sample frequency of high-speed a/d capture card
need to meet
>
.
The advantage that this method forms scheme with respect to traditional double-receiver system is: the method for utilizing single receiver just can realize the measurement of vector field shape is very advantageous in Terahertz frequency range, not only can reduce system cost, improve system stability and reliability, also help the system integration and miniaturization, carry out totally digitilized intermediate-freuqncy signal processing by high resolving power high-speed a/d analog input card, improve the signal to noise ratio (S/N ratio) of intermediate-freuqncy signal processing.This method also can expand in the measurement mechanism that transmitter and receiver adopts different frequency multiplication number of times, makes system configuration more flexible.
Accompanying drawing explanation
Fig. 1 is the structural representation that in background technology, double-receiver is measured Terahertz vector field shape device;
Fig. 2 is structural representation of the present invention;
Fig. 3 is the structural representation that the 560GHz vector field shape of first embodiment of the invention is measured;
Fig. 4 is the structural representation that the 850GHz vector field shape of first embodiment of the invention is measured.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is the structural representation of background art device, and Fig. 2 is to Figure 4 shows that structural representation of the present invention.
Reference numeral is wherein: transmitting frequently combines 1, local oscillator combines 2 frequently, directional coupler 3, the first directional coupler 31, the second directional coupler 32, frequency multiplication amplification module 4, radiation source to be measured 5, receiver 6, microwave mixer 7, capture card 8, vector voltage meter 9.
The first embodiment:
Single-receiver Terahertz vector field shape measurement mechanism of the present invention, as shown in Figure 2, comprise transmitting frequency comprehensive 1 and local oscillator frequency comprehensive 2, transmitting frequency comprehensive 1 and local oscillator combine 2 frequently respectively by 3 while of directional coupler connecting test passage and a reference channel, and in test channel, transmitting is frequently combined 1 and is connected with frequency multiplication amplification module 4 in turn by directional coupler 3, the receiver 6 of radiation source 5 to be measured and energy received RF signal mixing, wherein, in reference channel, transmitting frequency comprehensive 1 and local oscillator are frequently combined 2 and are all connected with microwave mixer 7 by directional coupler 3, receiver 6 and microwave mixer 7 are all connected with capture card 8.By the systematic survey 560GHz vector field shape shown in Fig. 2, as shown in Figure 3, in Fig. 3, radio frequency frequency comprehensive 1 and local oscillator frequency comprehensive 2 are exported respectively the microwave signal of 15.55GHz and 15.56GHz, respectively after 36 frequencys multiplication, generate the Terahertz radiofrequency signal of 559.8GHz and the Terahertz local oscillation signal of 560.16GHz, both obtain the test intermediate-freuqncy signal of 360MHz after the mixing of HEB frequency mixer filter and amplification in receiver 6.In addition, the signals that radio frequency frequency comprehensive 1 and local oscillator are combined 2 outputs are frequently directly by obtaining the reference intermediate-freuqncy signal of 10MHz after microwave mixer 7 mixing.Test intermediate-freuqncy signal with send into NI 5772R high-speed a/d analog input card with reference to intermediate-freuqncy signal simultaneously and sample, this capture card is double channels acquisition card, the highest sample frequency is 800MHz, resolution is 12bit, can realize the sampling dynamic range of the highest 72dB.The time-domain sampling signal of capture card output test and reference channel, then pass through software digital signal processing, the phase place finally obtaining after test signal is proofreaied and correct is
, wherein
with
be respectively the phase place of test signal and reference signal.Experimental result shows, this measuring system can realize in 560GHz frequency range ± 1% amplitude measurement precision and ± 1
ophase measurement accuracy.
The second embodiment:
As shown in Figure 4, in the present embodiment, transmitter and receiver adopts different frequency multiplication number of times, and by the systematic survey 850GHz vector field shape shown in Fig. 2.In the present embodiment, radio frequency frequency comprehensive 1 and local oscillator frequency comprehensive 2 are exported respectively the microwave signal of 11.81GHz and 15.74GHz, respectively after 72 frequencys multiplication and 54 frequencys multiplication, generate the Terahertz radiofrequency signal of 850.32GHz and the Terahertz local oscillation signal of 849.96GHz, both obtain the test intermediate-freuqncy signal of 360MHz after the mixing of HEB frequency mixer filter and amplification.In reference arm, the signals that radio frequency frequency comprehensive 1 and local oscillator are combined 2 outputs frequently, respectively through 4 times and 3 frequencys multiplication, obtain the millimeter-wave signal of 47.24GHz and 47.22GHz, and both obtain the reference intermediate-freuqncy signal of 20MHz after microwave mixer 7 mixing.Test and send into NI 5772R high-speed a/d analog input card with reference to intermediate-freuqncy signal simultaneously and sample, obtain the time-domain sampling signal of test and reference channel.The phase place finally obtaining after test signal is proofreaied and correct is
.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although by with reference to the preferred embodiments of the present invention, invention has been described, but those of ordinary skill in the art is to be understood that, can make various changes to it in the form and details, and not depart from the spirit and scope of the present invention that appended claims limits.
Claims (7)
1. single-receiver Terahertz vector field shape measurement mechanism, comprise that (1) is combined in transmitting frequently and local oscillator frequency is combined (2), it is characterized in that: this single-receiver Terahertz vector field shape measurement mechanism also comprises test channel and reference channel, in test channel, described transmitting is frequently combined (1) and is connected with frequency multiplication amplification module (4) in turn by directional coupler (3), the receiver (6) of radiation source to be measured (5) and energy received RF signal mixing, in reference channel, transmitting is frequently combined (1) and is all connected with microwave mixer (7) by another output port of directional coupler (3) with local oscillator frequently comprehensive (2), described receiver (6) and the medium frequency output end mouth of microwave mixer (7) are all connected with capture card (8).
2. single-receiver Terahertz vector field shape measurement mechanism according to claim 1, is characterized in that: described capture card (8) is double channel A/D capture card.
3. single-receiver Terahertz vector field shape measurement mechanism according to claim 1, it is characterized in that: described directional coupler (3) includes the first directional coupler (31) and the second directional coupler (32), described transmitting is frequently combined (1) and is connected with the first directional coupler (31), described local oscillator is frequently combined (2) and is connected with the second directional coupler (32), described the first directional coupler (31) and the second directional coupler (32) have included two output ports, and these two ports are communicated with respectively test channel and reference channel.
4. according to the single-receiver Terahertz vector field shape measurement mechanism described in claim 1 or 2 or 3, it is characterized in that: described transmitting is combined (1) frequently, local oscillator is frequently combined between (2) and capture card (8) and interconnected by 10MHz reference signal line.
5. the method for measuring Terahertz vector field shape by single-receiver Terahertz vector field shape measurement mechanism as claimed in claim 1, is characterized in that: comprise the following steps:
Step 1, transmitting are frequently combined (1) and are connected with a directional coupler (3) respectively with local oscillator frequently comprehensive (2), two output channels of described directional coupler (3) are respectively as test and reference channel, and transmitting is frequently combined the microwave signal frequency of (1) sending and is designated as
, local oscillator is frequently combined the microwave signal frequency of (2) sending and is designated as
;
Step 2, measuring in passage, transmitting is combined the microwave signal of (1) output frequently after frequency multiplication is amplified, and generates Terahertz radiofrequency signal, through receiver (6) receive and mixing after, generate test intermediate-freuqncy signal, its frequency is
=m (
-
), total frequency multiplication number of times that wherein m is test channel;
Step 3, in reference channel, the signal that transmitting is frequently combined and local oscillator is combined output is frequently sent in microwave mixer (7), generating reference intermediate-freuqncy signal, its frequency is
=
-
;
Step 4, send in capture card (8) by test intermediate-freuqncy signal with reference to intermediate-freuqncy signal, described capture card (8) carries out A/D sampling to the two, obtains the time-domain digital signal of test channel
x t (
t) and the time-domain digital signal of reference channel
x r (
t);
Step 5, time-domain digital signal to test channel and the time-domain digital signal of reference channel carry out software digital signal processing, obtain amplitude and the phase place of test channel.
6. the method for measurement Terahertz vector field shape according to claim 5, is characterized in that: the flow process that the time-domain digital signal to test channel in described step 5 and the time-domain digital signal of reference channel carry out software digital signal processing is:
Right respectively
x t (
t) and
x r (
t) carry out Fourier transform, obtain testing the frequency spectrum of intermediate frequency
x t (
f) and with reference to the frequency spectrum of intermediate frequency
x r (
f);
2) extract the amplitude of test signal intermediate frequency spectrum from test
and phase place
;
3) from the amplitude with reference to extracting reference signal intermediate frequency spectrum
and phase place
;
4) phase place of calculating after test signal is proofreaied and correct is
-m (
).
7. the method for measurement Terahertz vector field shape according to claim 5, is characterized in that: the sample frequency of capture card in described step 4 (8)
>
.
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Cited By (5)
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| CN110224764A (en) * | 2019-06-13 | 2019-09-10 | 复旦大学 | The method for generating vector terahertz signal using PM and IM based on ISB and multicarrier |
| CN111398919A (en) * | 2020-03-20 | 2020-07-10 | 北京环境特性研究所 | Electromagnetic scattering test link system and method for inhibiting video leakage interference |
| CN111740701A (en) * | 2019-03-24 | 2020-10-02 | 天津大学青岛海洋技术研究院 | Novel cross-coupling monolithic coherent receiver and transmitter |
| CN112130006A (en) * | 2020-09-24 | 2020-12-25 | 北京邮电大学 | Antenna test method and system |
| CN115473538A (en) * | 2022-08-25 | 2022-12-13 | 中国科学院紫金山天文台 | Method and device for realizing real-time cross-correlation of high-speed multi-frequency dual-channel data |
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| CN111740701A (en) * | 2019-03-24 | 2020-10-02 | 天津大学青岛海洋技术研究院 | Novel cross-coupling monolithic coherent receiver and transmitter |
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| CN112130006A (en) * | 2020-09-24 | 2020-12-25 | 北京邮电大学 | Antenna test method and system |
| CN115473538A (en) * | 2022-08-25 | 2022-12-13 | 中国科学院紫金山天文台 | Method and device for realizing real-time cross-correlation of high-speed multi-frequency dual-channel data |
| CN115473538B (en) * | 2022-08-25 | 2023-08-04 | 中国科学院紫金山天文台 | Method and device for realizing real-time cross-correlation of high-speed multi-frequency dual-channel data |
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