CN113139154B - Satellite-borne microwave imager on-orbit hot mirror temperature calculation device and method - Google Patents
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Abstract
The invention provides an on-orbit hot mirror temperature calculation device and method for a satellite-borne microwave imager, which are scientific, reasonable and easy to implement. The invention provides an effective and accurate on-orbit hot mirror temperature calculation device and method based on an on-orbit temperature measurement structure of a satellite-borne microwave imager, so that the temperature of a hot mirror can be calculated through the measurement of the temperature of a cold mirror of the microwave imager and can be used as the backup of the temperature of the hot mirror of the satellite-borne microwave imager, the problem that the satellite-borne microwave imager fails due to the failure of a hot mirror temperature measurement module is solved, and a good foundation is laid for the stability of the on-orbit radiation measurement of the satellite-borne microwave imager.
Description
Technical Field
The invention relates to an on-orbit hot mirror temperature calculation device and method for a satellite-borne microwave imager
Background
The microwave imager can invert parameters such as temperature, wind speed, sea ice, accumulated snow, soil humidity and precipitation by measuring surface and atmospheric radiation information, and is widely applied to the detection field of environments such as atmosphere, ocean and land. Whether the microwave imager can obtain accurate and effective surface brightness temperature remote sensing data during in-orbit operation mainly depends on the accurate detection of each part of the microwave imager. Therefore, in order to obtain effective and stable remote sensing data of the surface brightness temperature, stable operation of each part of the microwave imager is required.
During the on-orbit period of the microwave imager, if the hot mirror temperature measuring module is intact, the hot mirror temperature of the microwave imager is measured by the hot mirror temperature measuring module, but the hot mirror temperature measuring module may fail due to the complex space environment, and if the hot mirror temperature measuring module fails, the hot mirror temperature of the microwave imager cannot be measured. The invention provides an effective on-orbit hot mirror temperature calculation device and method for a satellite-borne microwave imager based on an on-orbit temperature measurement structure of the satellite-borne microwave imager, and the on-orbit hot mirror temperature calculation device and method can accurately calculate the on-orbit hot mirror temperature of the satellite-borne microwave imager after a hot mirror temperature measurement module fails.
Disclosure of Invention
The invention aims to provide a satellite-borne microwave imager on-orbit hot mirror temperature calculation device and a satellite-borne microwave imager on-orbit hot mirror temperature calculation method, which can solve the problem of calculation of the temperature of a hot mirror after a satellite-borne microwave imager hot mirror temperature measurement module is possibly out of service, so that hot mirror temperature backup of the satellite-borne microwave imager can be obtained, and a good foundation is laid for the stability of satellite-borne microwave imager on-orbit radiation measurement.
In order to solve the above problems, the present invention provides an on-orbit hot mirror temperature estimation device for a satellite-borne microwave imager, comprising:
a hot mirror temperature measuring module, a cold mirror temperature measuring module, a data preprocessing module, a data processing module, an objective function training module and a hot mirror temperature calculating module, wherein,
the hot mirror temperature measuring module is used for acquiring hot mirror temperature data and data acquisition time of the satellite-borne microwave imager in orbit to form a hot mirror original data set and transmitting the hot mirror original data set to the data preprocessing module;
the cold mirror temperature measuring module is used for acquiring cold mirror temperature data and data acquisition time of the satellite-borne microwave imager in orbit to form a cold mirror original data set and transmitting the cold mirror original data set to the data preprocessing module;
the data preprocessing module is used for preprocessing the hot mirror original data set transmitted by the hot mirror temperature measuring module and the cold mirror original data set of the cold mirror temperature measuring module, forming a preprocessed data set by the preprocessed hot mirror temperature data (Th), cold mirror temperature data (Tc) and data acquisition time, and transmitting the preprocessed data set to the data processing module;
the data processing module is used for processing the preprocessing data set transmitted by the data preprocessing module, forming a difference data set and a data set to be processed after processing, transmitting the difference data set to the target function training module and transmitting the data set to be processed to the hot mirror temperature calculating module;
the objective function training module is used for training an objective function according to the difference data set transmitted by the data processing module to obtain an objective function parameter, forming an objective function parameter data set by the objective function parameter and the data acquisition time, and transmitting the objective function parameter data set to the hot mirror temperature calculation module;
and the hot mirror temperature calculation module is used for calculating the hot mirror temperature according to the data set to be processed transmitted by the data processing module and the target function parameter data set transmitted by the target function training module.
Further, in the on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager, the data preprocessing module processes the hot mirror original data set transmitted by the hot mirror temperature measurement module and the cold mirror original data set of the cold mirror temperature measurement module, and the data preprocessing module includes:
and performing data matching of the hot mirror and the cold mirror according to the data acquisition time in the hot mirror original data set and the cold mirror original data set, arranging according to the sequence of the data acquisition time, deleting repeated data and the like.
Further, in the on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager, the data processing module is configured to determine whether the preprocessed data set hot mirror temperature data (Th) transmitted by the data preprocessing module is normal or not, wherein,
if the temperature of the hot mirror is normal, the hot mirror temperature measurement module is intact, difference data (Td is Th-Tc) of the temperature of the hot mirror and the temperature of the cold mirror in the preprocessing data set at the moment is calculated, the calculated temperature difference data and the data acquisition time in the preprocessing data set form a difference data set, and the difference data set is transmitted to the target function training module.
Furthermore, if the temperature of the hot mirror is abnormal, the hot mirror temperature measuring module is invalid, the cold mirror temperature data (Tc') in the preprocessing data set and the data acquisition time form a data set to be processed, and the data set to be processed is transmitted to the hot mirror temperature calculating module.
Further, in the above device for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager, the objective function of the objective function training module may be selected from the following functions:
Y＝a1*sin(b1*X+c1)+a2*sin(b2*X+c2)+a3*sin(b3*X+c3)+a4*sin(b4*X+c4)+a5*sin(b5*X+c5)+a6*sin(b6*X+c6)+a7*sin(b7*X+c7)+a8*sin(b8*X+c8)；
where Y represents a certain data set, X represents the number of data in the data set, and (a 1-a 8/b 1-b 8/c 1-c 8) represents objective function parameters.
Further, in the device for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager, the objective function training module is configured to use the difference data set transmitted by the data processing module as Y0The number of data in the difference data set is X0By X0And Y0And (3) training an objective function to obtain objective function parameters (a 1-a 8/b 1-b 8/c 1-c 8).
Further, in the above device for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager, the hot mirror temperature estimation module is configured to match the data acquisition time in the objective function parameter data set transferred by the objective function training module according to the data acquisition time in the to-be-processed data set transferred by the data processing module, that is, to match the same day in different years, input the objective function with the objective function parameters (a 1-a 8/b 1-b 8/c 1-c 8) in the matched objective function parameter data set, and simultaneously take the number of the cold mirror temperature data (Tc') in the to-be-processed data set transferred by the data processing module as X1Inputting the objective function, and calculating to obtain Y1Then, the hot mirror temperature (Th ═ Y) is calculated1+Tc′)。
According to another aspect of the invention, the invention further provides a method for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager, which comprises the following steps:
step 1, a hot mirror temperature measurement module collects hot mirror temperature data and data collection time to form a hot mirror original data set, and the hot mirror original data set is transmitted to a data preprocessing module;
step 2, the cold mirror temperature measurement module collects cold mirror temperature data and data collection time to form a cold mirror original data set, and the cold mirror original data set is transmitted to the data preprocessing module;
step 3, the data preprocessing module carries out preprocessing operation on the hot mirror original data set transmitted by the hot mirror temperature measuring module and the cold mirror original data set of the cold mirror temperature measuring module, and forms a preprocessed data set by the preprocessed hot mirror temperature data (Th), cold mirror temperature data (Tc) and data acquisition time, and transmits the preprocessed data set to the data processing module;
step 4, the data processing module processes the preprocessing data set transmitted by the data preprocessing module to form a difference data set and a data set to be processed, transmits the difference data set to the target function training module, and transmits the data set to be processed to the hot mirror temperature calculating module;
step 5, the objective function training module trains an objective function according to the difference data set transmitted by the data processing module to obtain an objective function parameter data set, and transmits the objective function parameter data set to the hot mirror temperature calculating module;
and 6, calculating by a hot mirror temperature calculation module according to the data set to be processed transmitted by the data processing module and the target function parameter data set transmitted by the target function training module to obtain the hot mirror temperature.
The invention provides an effective and accurate on-orbit hot mirror temperature calculation device and method based on an on-orbit temperature measurement structure of a satellite-borne microwave imager, so that the temperature of a hot mirror can be calculated through the measurement of the temperature of a cold mirror of the microwave imager and can be used as the backup of the temperature of the hot mirror of the satellite-borne microwave imager, the problem that the satellite-borne microwave imager fails due to the failure of a hot mirror temperature measurement module is solved, and a good foundation is laid for the stability of the on-orbit radiation measurement of the satellite-borne microwave imager.
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FIG. 1 is a schematic diagram of an on-orbit hot mirror temperature estimation device of a satellite-borne microwave imager.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides an on-orbit hot mirror temperature reckoning device of a satellite-borne microwave imager, as shown in figure 1, comprising:
a hot mirror temperature measuring module, a cold mirror temperature measuring module, a data preprocessing module, a data processing module, an objective function training module and a hot mirror temperature calculating module, wherein,
the hot mirror temperature measuring module is used for acquiring hot mirror temperature data and data acquisition time of the satellite-borne microwave imager in orbit to form a hot mirror original data set and transmitting the hot mirror original data set to the data preprocessing module;
the cold mirror temperature measuring module is used for acquiring cold mirror temperature data and data acquisition time of the satellite-borne microwave imager in orbit to form a cold mirror original data set and transmitting the cold mirror original data set to the data preprocessing module;
the data preprocessing module is used for preprocessing the hot mirror original data set transmitted by the hot mirror temperature measuring module and the cold mirror original data set of the cold mirror temperature measuring module, forming a preprocessed data set by the preprocessed hot mirror temperature data (Th), cold mirror temperature data (Tc) and data acquisition time, and transmitting the preprocessed data set to the data processing module;
the data processing module is used for processing the preprocessing data set transmitted by the data preprocessing module, forming a difference data set and a data set to be processed after processing, transmitting the difference data set to the target function training module and transmitting the data set to be processed to the hot mirror temperature calculating module;
the objective function training module is used for training an objective function according to the difference data set transmitted by the data processing module to obtain an objective function parameter, forming an objective function parameter data set by the objective function parameter and the data acquisition time, and transmitting the objective function parameter data set to the hot mirror temperature calculation module;
and the hot mirror temperature calculation module is used for calculating the hot mirror temperature according to the data set to be processed transmitted by the data processing module and the target function parameter data set transmitted by the target function training module.
Further, in the on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager, the data preprocessing module processes the hot mirror original data set transmitted by the hot mirror temperature measurement module and the cold mirror original data set of the cold mirror temperature measurement module, and the data preprocessing module includes:
and performing data matching of the hot mirror and the cold mirror according to the data acquisition time in the hot mirror original data set and the cold mirror original data set, arranging according to the sequence of the data acquisition time, deleting repeated data and the like.
Further, in the on-orbit hot mirror temperature estimation device for the satellite-borne microwave imager, the data processing module is configured to determine whether the preprocessed data set hot mirror temperature data (Th) transmitted by the data preprocessing module is normal:
further, if the hot mirror temperature is normal, it is indicated that the hot mirror temperature measurement module is intact, difference data (Td ═ Th-Tc) of the hot mirror and the cold mirror temperature in the preprocessing data set at this time is calculated, the calculated temperature difference data and the data acquisition time in the preprocessing data set form a difference data set, and the difference data set is transmitted to the target function training module.
Furthermore, if the temperature of the hot mirror is abnormal, the hot mirror temperature measuring module is invalid, the cold mirror temperature data (Tc') in the preprocessing data set and the data acquisition time form a data set to be processed, and the data set to be processed is transmitted to the hot mirror temperature calculating module.
Further, in the above device for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager, the objective function of the objective function training module may be selected from the following functions:
Y＝a1*sin(b1*X+c1)+a2*sin(b2*X+c2)+a3*sin(b3*X+c3)+a4*sin(b4*X+c4)+a5*sin(b5*X+c5)+a6*sin(b6*X+c6)+a7*sin(b7*X+c7)+a8*sin(b8*X+c8)；
wherein Y represents a certain data set, X represents the number of data in the data set, and (a 1-a 8/b 1-b 8/c 1-c 8) represent objective function parameters.
Further, in the aboveIn the on-orbit hot mirror temperature calculation device of the satellite-borne microwave imager, the target function training module is used for taking the difference data set transmitted by the data processing module as Y0The number of data in the difference data set is X0By X0And Y0And (4) training an objective function to obtain objective function parameters (a 1-a 8/b 1-b 8/c 1-c 8).
Further, in the above device for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager, the hot mirror temperature estimation module is configured to match the data acquisition time in the objective function parameter data set transferred by the objective function training module according to the data acquisition time in the to-be-processed data set transferred by the data processing module, that is, to match the same day in different years, input the objective function with the objective function parameters (a 1-a 8/b 1-b 8/c 1-c 8) in the matched objective function parameter data set, and simultaneously take the number of the cold mirror temperature data (Tc') in the to-be-processed data set transferred by the data processing module as X1Inputting the objective function, and calculating to obtain Y1Then, the hot mirror temperature (Th ═ Y) is calculated1+Tc′)。
According to another aspect of the invention, a method for estimating the temperature of the on-orbit hot mirror of the satellite-borne microwave imager is also provided, and the method comprises the following steps:
step 1, a hot mirror temperature measurement module collects hot mirror temperature data and data collection time to form a hot mirror original data set, and the hot mirror original data set is transmitted to a data preprocessing module;
step 2, the cold mirror temperature measurement module collects cold mirror temperature data and data collection time to form a cold mirror original data set, and the cold mirror original data set is transmitted to the data preprocessing module;
step 3, the data preprocessing module carries out preprocessing operation on the hot mirror original data set transmitted by the hot mirror temperature measuring module and the cold mirror original data set of the cold mirror temperature measuring module, and forms a preprocessed data set by the preprocessed hot mirror temperature data (Th), cold mirror temperature data (Tc) and data acquisition time, and transmits the preprocessed data set to the data processing module;
step 4, the data processing module processes the preprocessing data set transmitted by the data preprocessing module to form a difference data set or a data set to be processed, and transmits the difference data set to the target function training module or transmits the data set to be processed to the hot mirror temperature calculating module;
step 5, the objective function training module trains an objective function according to the difference data set transmitted by the data processing module to obtain an objective function parameter data set, and transmits the objective function parameter data set to the hot mirror temperature calculating module;
and 6, calculating by a hot mirror temperature calculation module according to the data set to be processed transmitted by the data processing module and the target function parameter data set transmitted by the target function training module to obtain the hot mirror temperature.
In summary, the invention provides an on-orbit hot mirror temperature estimation device and method for a satellite-borne microwave imager. The invention provides an effective and accurate on-orbit hot mirror temperature calculation device and method based on an on-orbit temperature measurement structure of a satellite-borne microwave imager, so that the temperature of a hot mirror can be calculated through the measurement of the temperature of a cold mirror of the microwave imager and can be used as the backup of the temperature of the hot mirror of the satellite-borne microwave imager, the problem that the satellite-borne microwave imager fails due to the failure of a hot mirror temperature measurement module is solved, and a good foundation is laid for the stability of the on-orbit radiation measurement of the satellite-borne microwave imager.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The utility model provides a satellite-borne microwave imager is at hot mirror temperature calculation device of orbit which characterized in that includes: a hot mirror temperature measuring module, a cold mirror temperature measuring module, a data preprocessing module, a data processing module, an objective function training module and a hot mirror temperature calculating module, wherein,
the hot mirror temperature measuring module is used for acquiring hot mirror temperature data and data acquisition time of the satellite-borne microwave imager in orbit to form a hot mirror original data set and transmitting the hot mirror original data set to the data preprocessing module;
the cold mirror temperature measuring module is used for acquiring cold mirror temperature data and data acquisition time of the satellite-borne microwave imager in orbit to form a cold mirror original data set and transmitting the cold mirror original data set to the data preprocessing module;
the data preprocessing module is used for preprocessing the hot mirror original data set transmitted by the hot mirror temperature measuring module and the cold mirror original data set of the cold mirror temperature measuring module, forming a preprocessed data set by the preprocessed hot mirror temperature data Th, the preprocessed cold mirror temperature data Tc and the data acquisition time, and transmitting the preprocessed data set to the data processing module;
the data processing module is used for processing the preprocessing data set transmitted by the data preprocessing module, forming a difference data set and a data set to be processed after processing, transmitting the difference data set to the target function training module and transmitting the data set to be processed to the hot mirror temperature calculating module;
the objective function training module is used for training an objective function according to the difference data set transmitted by the data processing module to obtain an objective function parameter, forming an objective function parameter data set by the objective function parameter and the data acquisition time, and transmitting the objective function parameter data set to the hot mirror temperature calculation module;
and the hot mirror temperature calculation module is used for calculating the hot mirror temperature according to the data set to be processed transmitted by the data processing module and the target function parameter data set transmitted by the target function training module.
2. The on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager as claimed in claim 1, wherein the data preprocessing module processes the hot mirror raw data set and the cold mirror raw data set of the cold mirror temperature measurement module transmitted by the hot mirror temperature measurement module, and comprises:
and performing hot mirror and cold mirror data matching according to the data acquisition time in the hot mirror original data set and the cold mirror original data set, and arranging and deleting repeated data according to the sequence of the data acquisition time.
3. The on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager as claimed in claim 1, wherein the data processing module is configured to determine whether the pre-processing data set Th transmitted by the data pre-processing module is normal or not,
if the temperature of the hot mirror is normal, the hot mirror temperature measurement module is intact, difference data Td of the temperature of the hot mirror and the temperature of the cold mirror in the preprocessing data set at the moment are calculated to be Th-Tc, the temperature difference data obtained through calculation and data acquisition time in the preprocessing data set form a difference data set, and the difference data set is transmitted to a target function training module;
if the hot mirror temperature is abnormal, the hot mirror temperature measuring module is out of work, a data set to be processed is formed by cold mirror temperature data Tc' in the preprocessing data set and data acquisition time, and the data set to be processed is transmitted to the hot mirror temperature calculating module.
4. The on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager as claimed in claim 1, wherein the objective function of the objective function training module is as follows:
Y＝a1*sin(b1*X+c1)+a2*sin(b2*X+c2)+a3*sin(b3*X+c3)+a4*sin(b4*X+c4)+a5*sin(b5*X+c5)+a6*sin(b6*X+c6)+a7*sin(b7*X+c7)+a8*sin(b8*X+c8)；
wherein Y represents a certain data set, X represents the number of data in the data set, and a 1-a 8/b 1-b 8/c 1-c 8 represent objective function parameters.
5. The on-orbit hot mirror temperature estimation device of the satellite-borne microwave imager as claimed in claim 4, wherein the objective function training module is used for taking the difference data set transmitted by the data processing module as Y0The number of data in the difference data set is X0By X0And Y0And training an objective function to obtain objective function parameters a 1-a 8/b 1-b 8/c 1-c 8.
6. The on-orbit hot mirror temperature estimation device for the satellite-borne microwave imager as claimed in claim 1, wherein the hot mirror temperature estimation module is configured to match the data acquisition time in the objective function parameter data set transferred by the objective function training module according to the data acquisition time in the to-be-processed data set transferred by the data processing module, that is, match the same day of different years, input the objective function into the matched objective function parameters a 1-a 8/b 1-b 8/c 1-c 8 in the objective function parameter data set, and simultaneously take the number of the cold mirror temperature data Tc' in the to-be-processed data set transferred by the data processing module as X1Inputting the objective function, and calculating to obtain Y1Then calculating the hot mirror temperature Th ═ Y1+Tc'。
7. A satellite-borne microwave imager on-orbit hot mirror temperature calculation method is characterized by comprising the following steps:
step 1, a hot mirror temperature measurement module collects hot mirror temperature data and data collection time to form a hot mirror original data set, and the hot mirror original data set is transmitted to a data preprocessing module;
step 2, the cold mirror temperature measurement module collects cold mirror temperature data and data collection time to form a cold mirror original data set, and the cold mirror original data set is transmitted to the data preprocessing module;
step 3, the data preprocessing module carries out preprocessing operation on the hot mirror original data set transmitted by the hot mirror temperature measuring module and the cold mirror original data set of the cold mirror temperature measuring module, and forms a preprocessed data set by the preprocessed hot mirror temperature data Th, the preprocessed cold mirror temperature data Tc and the data acquisition time, and transmits the preprocessed data set to the data processing module;
step 4, the data processing module processes the preprocessing data set transmitted by the data preprocessing module to form a difference data set and a data set to be processed, transmits the difference data set to the target function training module, and transmits the data set to be processed to the hot mirror temperature calculating module;
step 5, the objective function training module trains an objective function according to the difference data set transmitted by the data processing module to obtain an objective function parameter data set, and transmits the objective function parameter data set to the hot mirror temperature calculating module;
and 6, calculating by a hot mirror temperature calculating module according to the data set to be processed transmitted by the data processing module and the target function parameter data set transmitted by the target function training module to obtain the hot mirror temperature.
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