CN110474695A - A kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference - Google Patents
A kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference Download PDFInfo
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- CN110474695A CN110474695A CN201910772593.6A CN201910772593A CN110474695A CN 110474695 A CN110474695 A CN 110474695A CN 201910772593 A CN201910772593 A CN 201910772593A CN 110474695 A CN110474695 A CN 110474695A
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Abstract
The present invention relates to a kind of inspection suitable for microwave radiometer interchannel energy mutual interference and optimization methods, belong to Calibration of Microwave Radiometer technical field.The following steps are included: Step 1: apparatus measures module is built；Test circuit built is taken according to the sequence of preparation low temperature noise source, adjustable attenuator, filter, microwave radiometer；The quantity in low temperature noise source is I；Each low temperature noise source can produce multiple frequency signals；Microwave radiation is calculated as instrument to be measured；The frequency in low temperature noise source is denoted as F1, F2..., Fi, and frequency F1 < F2 < ... < Fi；Step 2: observing the correlation circumstance of other channels Fj and F1 signal, if other channels Fj output signal is related to F1, there are problems that interchannel mutual interference；Step 3: the overall gain for improving the 1dB compression point power of microwave radiometer amplifier, reducing amplification link, the output general power of step-down amplifier；This method have the advantages that precision it is high, it is at low cost and convenient for promote.
Description
Technical field
The present invention relates to a kind of inspection suitable for microwave radiometer interchannel energy mutual interference and optimization methods, belong to microwave
Calibration of radiometer technical field.
Background technique
In microwave and millimeter wave band, microwave radiometer is in order to improve enough channel observed objects, it has to use
Multichannel shares an antenna and the mode of radio circuit is arranged receiver, therefore multichannel shares mutual cross-interference issue system
About the application of multi-channel microwave radiometer, it is therefore desirable to a kind of simple and easy measurement method is tested and optimizes interchannel
Mutual interference.
Summary of the invention
The purpose of the invention is to optimize existing microwave radiometer interchannel energy mutual interference inspection and optimization method, seek
A kind of inspection suitable for microwave radiometer interchannel energy mutual interference and optimization method are looked for, proposes and a kind of is suitable for microwave radiation
Count inspection and the optimization method of interchannel energy mutual interference.
The technical solution adopted by the invention is as follows:
A kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference, microwave radiometer
Service band is in microwave band 1-1000GHz；Multiple wave bands share common antenna and radio circuit, comprising the following steps:
Step 1: building apparatus measures module, following sub-step is specifically included:
Prepare low temperature noise source, adjustable attenuator, filter, microwave radiometer, and sequentially takes test circuit built according to this；
Wherein, the quantity in low temperature noise source is I；
Each low temperature noise source is that waveguide load is immersed in liquid nitrogen, and noise temperature is liquid nitrogen temperature, can produce multiple frequencies
Signal；
Wherein, multiple frequency signals are adjustable dampings, and the working range of adjustable attenuator is within the scope of 0-60dB；
Filter is low-pass filter, can be passed through less than the signal to measured frequency, greater than the suppression of the signal to measured frequency
System is greater than 40dBc；Microwave radiation is calculated as instrument to be measured；
Wherein, the frequency in low temperature noise source is denoted as F1, F2..., Fi, and frequency F1 < F2 < ... < Fi；
Step 2 selects the frequency in low temperature noise source for the 1st channel frequence F1, adjusts adjustable attenuator, records microwave radiation
The output for counting each channel places the output signal in other channels and F1 signal together；
Wherein, adjustable attenuator switches between the two in 60dB, 0dB；
Step 3: it is related or uncorrelated to F1 signal to observe other channels Fj, if other channels Fj output signal and
F1 is related, then there are problems that interchannel mutual interference:
Wherein, the signal for inhibiting frequency to be higher than F1 according to circuit design, low-pass filter, microwave radiometer cannot receive
Fj signal；
Wherein, the value range of j is 2 to i；
Step 4: improve optimization interchannel mutual interference, specifically: the 1dB compression point power of raising microwave radiometer amplifier,
1~10dB is promoted on the basis of original receiver 1dB power compression point, so that receiver has more wide dynamic range；
Step 5: improving optimization interchannel mutual interference, the overall gain of microwave radiometer amplification link is reduced, microwave radiation is reduced
Count the output general power of amplifier；
So far, from step 1 to step 5, inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference,
The mutual cross-interference issue of multi-channel microwave radiometer interchannel signal can be examined, and optimizes and solves interchannel crosstalk.
Beneficial effect
A kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference of the present invention, with prior art phase
Than having the following beneficial effects:
In order to examine and optimize the mutual interference of microwave radiometer interchannel energy, using test circuit methods are built, one is carried out
Fixed data acquisition, analysis obtain the relevant quantitative relation of interchannel, and this method is simple, at low cost, excellent convenient for popularization etc.
Point, therefore it is adapted as inspection and the optimization method of microwave radiometer interchannel energy mutual interference.
Detailed description of the invention
Fig. 1 is that a kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference of the present invention relies on and be
The structural schematic diagram of system；
Fig. 2 is a kind of inspection and optimization method interchannel energy suitable for microwave radiometer interchannel energy mutual interference of the present invention
Measure the result schematic diagram of mutual interference.
Specific embodiment
With reference to the accompanying drawings and examples to a kind of inspection suitable for microwave radiometer interchannel energy mutual interference of the present invention
It is described further with optimization method.
Embodiment 1
Fig. 1 is relied on the knot of system by a kind of inspection suitable for microwave radiometer interchannel energy mutual interference and optimization method
Structure schematic diagram.Low temperature noise source generates the frequency signal of F1 as can be seen from Figure 1, carries out deamplification by adjustable attenuator
It works (switching between 0dB, 60dB), then is filtered by filter, signal of the frequency higher than F1 is filtered out, rear end microwave
Radiometer can only receive frequency and be lower than the signal for being equal to F1.
Interchannel energy mutual interference schematic diagram when Fig. 2 is present invention specific implementation；Low temperature noise source generates as can be seen from Figure 2
The frequency signal of F1 (channel 1, top half curve) carries out the work of deamplification (in 0dB and 60dB by adjustable attenuator
Between switch, signal bumps when 0dB, signal is recessed when 60dB), then be filtered by filter, frequency is higher than the signal of F1
It is filtered out, rear end microwave radiometer can receive frequency F1 and F4 (channel 4, i.e. lower half portion curve, signal frequency are higher than F1)
Signal illustrates that frequency F1 signal energy crosstalk enters channel 4, verifies interchannel energy mutual interference problem.
From test chart, it can be seen that, the signal intensity of top half curved channel 1 causes the change of lower half curved channel 4
Change, according to circuit design structure, the curve of output of lower half portion curved channel 4 should be 0 (no output), and when channel, 1 signal is in
1.4v when existing high-power output, 4 signal of channel are presented low-power and export 0.2v, when low-power output is presented in 1 signal of channel
High-power output 0.7v is presented in 0.7v, 4 signal of channel, it is seen that strong correlation is presented in the two signal, illustrates the normal of channel 1
The work influence work in channel 4.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (4)
1. a kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference, it is characterised in that: relied on
The service band of microwave radiometer is in microwave band 1-1000GHz；Multiple wave bands share common antenna and radio circuit；
The inspection and optimization method, comprising the following steps:
Step 1: building apparatus measures module, following content is specifically included:
Prepare low temperature noise source, adjustable attenuator, filter, microwave radiometer, and sequentially takes test circuit built according to this；
Each low temperature noise source is that waveguide load is immersed in liquid nitrogen, and noise temperature is liquid nitrogen temperature, can produce multiple frequency signals；
Wherein, multiple frequency signals are adjustable dampings, and the working range of adjustable attenuator is within the scope of 0-60dB；
Filter is low-pass filter, can be passed through less than the signal to measured frequency, greater than the degree of suppression of the signal to measured frequency
Greater than 40dBc；Microwave radiation is calculated as instrument to be measured；
Step 2 selects the frequency in low temperature noise source for first passage frequency F1, adjusts adjustable attenuator, records microwave radiometer
The output in each channel places the output signal in other channels and F1 signal together；
Wherein, adjustable attenuator switches between the two in 60dB, 0dB；
Step 3: it is related or uncorrelated to F1 signal to observe other channels Fj, if other channels Fj output signal and F1 phase
It closes, then there are problems that interchannel mutual interference:
Wherein, the signal for inhibiting frequency to be higher than F1 according to circuit design, low-pass filter, microwave radiometer cannot receive Fj letter
Number；
Step 4: improve optimization interchannel mutual interference, specifically: improve the 1dB compression point power of microwave radiometer amplifier, in original
Have and promote 1~10dB on the basis of receiver 1dB power compression point, so that receiver has more wide dynamic range；
Step 5: improving optimization interchannel mutual interference, the overall gain of microwave radiometer amplification link is reduced, microwave radiometer is reduced and puts
The output general power of big device；
So far, from step 1 to step 5, inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference can be with
The mutual cross-interference issue of multi-channel microwave radiometer interchannel signal is examined, and optimizes and solves interchannel crosstalk.
2. a kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference according to claim 1,
It is characterized by: the quantity in low temperature noise source is I.
3. according to claim 1 with a kind of inspection suitable for microwave radiometer interchannel energy mutual interference as claimed in claim 2
And optimization method, it is characterised in that: the frequency in low temperature noise source is denoted as F1, F2..., Fi, and frequency F1 < F2 < ... < Fi.
4. a kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference according to claim 1,
It is characterized by: the value range of j is 2 to i.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112666636A (en) * | 2020-12-18 | 2021-04-16 | 西安空间无线电技术研究所 | Channel coupling performance test method of microwave radiometer spectrum subdivision receiver |
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| CN112666636A (en) * | 2020-12-18 | 2021-04-16 | 西安空间无线电技术研究所 | Channel coupling performance test method of microwave radiometer spectrum subdivision receiver |
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