CN110474695B - Method for detecting and optimizing energy mutual interference between microwave radiometer channels - Google Patents
Method for detecting and optimizing energy mutual interference between microwave radiometer channels Download PDFInfo
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- CN110474695B CN110474695B CN201910772593.6A CN201910772593A CN110474695B CN 110474695 B CN110474695 B CN 110474695B CN 201910772593 A CN201910772593 A CN 201910772593A CN 110474695 B CN110474695 B CN 110474695B
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Abstract
The invention relates to a method for detecting and optimizing energy mutual interference among microwave radiometers, and belongs to the technical field of microwave radiometer calibration. The method comprises the following steps: firstly, building an instrument measuring module; building a test circuit according to the sequence of preparing a low-temperature noise source, an adjustable attenuator, a filter and a microwave radiometer; the number of the low-temperature noise sources is I; each low temperature noise source can generate a plurality of frequency signals; the microwave radiometer is an instrument to be measured; the frequencies of the low-temperature noise sources are denoted as F1, F2.., > Fi, and the frequency F1< F2. < Fi; step two, observing the correlation condition of other channels Fj and F1 signals, and if the output signals of other channels Fj are correlated with F1, the problem of mutual interference among channels exists; step three, improving the 1dB compression point power of the microwave radiometer amplifier, reducing the total gain of an amplification link, and reducing the total output power of the amplifier; the method has the advantages of high precision, low cost and convenient popularization.
Description
Technical Field
The invention relates to a method for detecting and optimizing energy mutual interference among microwave radiometers, and belongs to the technical field of microwave radiometer calibration.
Background
In microwave and millimeter wave bands, in order to improve enough channel observation targets, a receiver has to be arranged in a way that multiple channels share one antenna and a radio frequency circuit, so that the application of the multi-channel microwave radiometer is restricted by the problem of mutual crosstalk shared by the multiple channels, and a simple and easy measurement method is needed for detecting and optimizing mutual interference between the channels.
Disclosure of Invention
The invention aims to optimize an existing method for detecting and optimizing mutual energy interference between microwave radiometer channels, finds a method for detecting and optimizing mutual energy interference between microwave radiometer channels, and provides a method for detecting and optimizing mutual energy interference between microwave radiometer channels.
The technical scheme adopted by the invention is as follows:
the method is suitable for detecting and optimizing the energy mutual interference among the microwave radiometer channels, and the working waveband of the microwave radiometer is 1-1000 GHz; a plurality of bands share an antenna and radio frequency circuit, comprising the steps of:
step one, building an instrument measuring module, and specifically comprising the following substeps:
preparing a low-temperature noise source, an adjustable attenuator, a filter and a microwave radiometer, and building a test circuit according to the sequence;
wherein, the number of the low-temperature noise sources is I;
each low-temperature noise source is a waveguide load and is immersed in liquid nitrogen, the noise temperature is the liquid nitrogen temperature, and a plurality of frequency signals can be generated;
wherein, the frequency signals are attenuated adjustably, and the working range of the adjustable attenuator is within the range of 0-60 dB;
the filter is a low-pass filter, signals with frequencies smaller than the frequency to be measured can pass through the filter, and the suppression degree of the signals with frequencies larger than the frequency to be measured is larger than 40 dBc; the microwave radiometer is an instrument to be measured;
wherein, the frequencies of the low-temperature noise source are recorded as F1, F2.., Fi, and the frequency F1< F2< > Fi;
selecting the frequency of a low-temperature noise source as a channel 1 frequency F1, adjusting an adjustable attenuator, recording the output of each channel of the microwave radiometer, and placing the output signals of other channels and the F1 signal together;
wherein, the adjustable attenuator is switched between 60dB and 0 dB;
and step three, observing the correlation or the irrelevance of signals of other channels Fj and F1, if the output signals of other channels Fj are correlated with F1, the problem of interchannel mutual interference exists:
according to the circuit design, the low-pass filter inhibits signals with the frequency higher than F1, and the microwave radiometer cannot receive Fj signals;
wherein j has a value ranging from 2 to i;
step four, improving and optimizing mutual interference among channels, specifically: the power of a 1dB compression point of a microwave radiometer amplifier is improved, and 1-10 dB is improved on the basis of the 1dB power compression point of the original receiver, so that the receiver has a wider dynamic range;
fifthly, improving and optimizing mutual interference among channels, reducing the total gain of an amplification link of the microwave radiometer and reducing the total output power of an amplifier of the microwave radiometer;
therefore, from the first step to the fifth step, the method is suitable for the method for detecting and optimizing the energy mutual interference among the microwave radiometer channels, can detect the mutual interference problem of signals among the multi-channel microwave radiometer channels, and can optimally solve the mutual interference among the channels.
Advantageous effects
Compared with the prior art, the method for detecting and optimizing the energy mutual interference between the microwave radiometer channels has the following beneficial effects:
in order to test and optimize mutual interference of energy between microwave radiometer channels, a test circuit method is set up, a certain data acquisition process is carried out, and related quantity relations between the channels are obtained through analysis.
Drawings
FIG. 1 is a schematic structural diagram of a system for testing and optimizing energy crosstalk between microwave radiometers according to the present invention;
FIG. 2 is a schematic diagram of the results of the inter-channel energy cross talk for the inspection and optimization method of the inter-channel energy cross talk of the microwave radiometer of the present invention.
Detailed Description
The method for testing and optimizing the energy mutual interference between the channels of the microwave radiometer according to the present invention will be further described with reference to the accompanying drawings and embodiments.
Example 1
Fig. 1 is a schematic structural diagram of a system for testing and optimizing energy mutual interference between channels of a microwave radiometer. It can be seen from fig. 1 that the low temperature noise source generates a frequency signal of F1, the adjustable attenuator performs signal attenuation (switching between 0dB and 60 dB), the filter performs filtering, the signal with frequency higher than F1 is filtered, and the rear-end microwave radiometer can only receive the signal with frequency lower than or equal to F1.
FIG. 2 is a schematic diagram of the energy crosstalk between channels in an embodiment of the present invention; it can be seen from fig. 2 that the low temperature noise source generates a frequency signal of F1 (channel 1, upper half curve), the adjustable attenuator performs signal attenuation (switching between 0dB and 60dB, signal convex at 0dB, signal concave at 60 dB), and the filter performs filtering, so that the signal with frequency higher than F1 is filtered, and the rear-end microwave radiometer can receive signals with frequencies F1 and F4 (channel 4, lower half curve, signal frequency higher than F1), which shows that the signal energy crosstalk with frequency F1 enters channel 4, and the problem of energy crosstalk between channels is detected.
It can be seen from the test chart that the signal change of the upper half curve channel 1 causes the change of the lower half curve channel 4, according to the circuit design structure, the output curve of the lower half curve channel 4 should be 0 (no output), when the channel 1 signal shows high power output, 1.4v, the channel 4 signal shows low power output, 0.2v, when the channel 1 signal shows low power output, 0.7v, the channel 4 signal shows high power output, 0.7v, it can be seen that the two signals show strong correlation, which indicates that the normal operation of the channel 1 affects the operation of the channel 4.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for detecting and optimizing energy mutual interference between microwave radiometer channels is characterized by comprising the following steps: the working wave band of the supported microwave radiometer is 1-1000 GHz; a plurality of wave bands share one antenna and a radio frequency circuit;
the inspection and optimization method comprises the following steps:
step one, building an instrument measuring module, which specifically comprises the following contents:
preparing a low-temperature noise source, an adjustable attenuator, a filter and a microwave radiometer, and building a test circuit according to the sequence;
each low temperature noise source can generate a plurality of frequency signals; the low-temperature noise source is a waveguide load immersed in liquid nitrogen, and the noise temperature is the liquid nitrogen temperature;
wherein, the frequency signals are attenuated adjustably, and the working range of the adjustable attenuator is within the range of 0-60 dB;
the filter is a low-pass filter, signals with frequencies smaller than the frequency to be measured can pass through the filter, and the suppression degree of the signals with frequencies larger than the frequency to be measured is larger than 40 dBc; the microwave radiometer is an instrument to be measured;
selecting the frequency of the low-temperature noise source as a first channel frequency F1, adjusting an adjustable attenuator, recording the output of each channel of the microwave radiometer, and placing the output signals of other channels and the F1 signal together;
wherein, the adjustable attenuator is switched between 60dB and 0 dB;
and step three, observing the correlation or the irrelevance of signals of other channels Fj and F1, if the output signals of other channels Fj are correlated with F1, the problem of interchannel mutual interference exists:
according to the circuit design, the low-pass filter inhibits signals with the frequency higher than F1, and the microwave radiometer cannot receive Fj signals;
step four, improving and optimizing mutual interference among channels, specifically: the power of a 1dB compression point of a microwave radiometer amplifier is improved, and 1-10 dB is improved on the basis of the 1dB power compression point of the original receiver, so that the receiver has a wider dynamic range;
fifthly, improving and optimizing mutual interference among channels, reducing the total gain of an amplification link of the microwave radiometer and reducing the total output power of an amplifier of the microwave radiometer;
therefore, from the first step to the fifth step, the method is suitable for the method for detecting and optimizing the energy mutual interference among the microwave radiometer channels, can detect the mutual interference problem of signals among the multi-channel microwave radiometer channels, and can optimally solve the mutual interference among the channels.
2. The method of claim 1 for testing and optimizing mutual energy interference between microwave radiometers, wherein: the number of the low-temperature noise sources is I.
3. A method of testing and optimising the energy crosstalk between microwave radiometers channels according to claim 1 or claim 2, characterized in that: the frequencies of the low temperature noise sources are denoted as F1, F2.., > Fi, and the frequency F1< F2. < Fi.
4. The method of claim 1 for testing and optimizing mutual energy interference between microwave radiometers, wherein: j ranges from 2 to i.
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