CN112067016B - Method and device for selecting power transmission source for calibrating electric axis of multi-frequency terahertz detector for static track - Google Patents
Method and device for selecting power transmission source for calibrating electric axis of multi-frequency terahertz detector for static track Download PDFInfo
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Abstract
The disclosure provides a method for selecting a radio frequency power source for calibrating an electric axis of a multi-frequency terahertz detector for a stationary track. According to the set basic transmitting power star watch and the accurate limit flow density of the transmitting power source, the special transmitting power star watch is configured, so that transmitting power source information which can be observed by all specified wave bands of the multi-frequency terahertz detecting instrument together is obtained, and transmitting power source observation data of all the wave bands are provided for calibrating an electric shaft of the multi-frequency band terahertz detecting instrument in an on-orbit real-time mode. In addition, the radio source information appearing in the range of the observable field of the multi-frequency terahertz detector at a certain observation moment in the future is forecasted to generate an observable radio source star watch, so that the observation time period of the multi-frequency terahertz detector and the optimal observable radio source basic information of each specified waveband can be determined conveniently, and basic data are provided for on-orbit calibration of the antenna electric axis of the multi-frequency terahertz detector.
Description
Technical Field
The disclosure relates to a radio source selection method for calibrating an electric axis of a multi-frequency terahertz detector for a stationary orbit, and also relates to a radio source selection device for calibrating the electric axis of the multi-frequency terahertz detector for the stationary orbit, belonging to the technical field of satellite remote sensing.
Background
The wind-cloud-fourth (FY-4) meteorological satellite is a new generation of geostationary orbit meteorological satellite in China, and the geostationary orbit meteorological satellite adopts a three-axis stable platform to improve the earth observation precision, the observation frequency and the flexibility of an observation area, thereby realizing the important crossing in technology. The wind cloud four weather satellite comprises an optical star and a microwave star, and the microwave star carries a multi-frequency terahertz detector (a multi-band terahertz detector). How to realize the accurate positioning of the remote sensing data of each frequency band of the multi-frequency terahertz detector lays a foundation for product generation and data quantitative application, and is an important problem facing at present.
The multi-frequency terahertz detector is adopted to carry out radio source observation on the earth static orbit to obtain radio source remote sensing data of different frequency bands, and the remote sensing data can be positioned and corrected in real time by establishing a pointing correction model based on the radio source, so that a high-precision positioning result of the ground remote sensing data can be obtained conveniently. The radio source refers to a general name of a celestial body with radio emission, that is, all celestial bodies with radio emission can be referred to as radio sources.
However, in view of the requirement for high-precision positioning of remote sensing data of a multi-frequency terahertz detector on a static track, aiming at the characteristics of small antenna aperture, high working frequency, narrow bandwidth, high antenna temperature, short integration time and the like of the multi-frequency terahertz detector and based on the purpose of calibrating performance parameters and an electric axis of the multi-frequency terahertz detector, a practical and effective radio source selection method needs to be researched to guide the multi-frequency terahertz detector to carry out on-track observation and provide basic data for realizing on-track calibration of the electric axis of the antenna.
Disclosure of Invention
The first technical problem to be solved by the present disclosure is to provide a radio frequency power source selection method for calibrating an electric axis of a multi-frequency terahertz detector for a stationary track.
Another technical problem to be solved by the present disclosure is to provide a radio frequency power selection device for calibrating an electric axis of a multi-frequency terahertz detector for a stationary track.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
according to a first aspect of the embodiments of the present disclosure, a radio source selection method for calibrating an electric axis of a stationary track multi-frequency terahertz detector is provided, which includes the following steps:
setting a basic radio source star catalogue;
calculating the limit flow density of the radio source observed on a specified wave band, and correcting the limit flow density of the radio source according to the type of the radio source;
configuring a special radio frequency power source star watch according to the basic radio frequency power source star watch, the corrected limit flow density of the radio frequency power source and a preset critical value of the limit flow density of the radio frequency power source;
forecasting the radio source information appearing in the range of the observable field of view of the multi-frequency terahertz detector at a certain observation time in the future to generate an observable radio source star catalogue;
And determining the optimal observable power supply of the observation time period and each appointed waveband of the multi-frequency terahertz detector according to the observable power supply star catalogue, the view field of the multi-frequency terahertz detector and the signal integration time constraint, and outputting the basic information of the optimal observable power supply.
Preferably, the basic radio frequency source star catalogue is set, and the implementation process is as follows:
acquiring the star catalogue data of the radio sources, and performing sorting, cross authentication and perfecting to obtain basic information of the radio sources observed on each band;
calculating the flux density of the radio frequency source observed on the appointed wave band according to the basic information of the radio frequency source of each wave band;
and combining the basic information of the radio frequency source and the flow density of the radio frequency source to obtain the basic radio frequency source star catalogue.
Preferably, the basic information of the radio source observed on each band includes one or more of the name, position accuracy, brightness, radiation information, motion speed, stability, right ascension, declination, pointing angle, and observation time of the radio source.
Preferably, the limit flow density of the radio frequency source observed on the specified wave band is calculated according to the following formula;
In the above formula, k is the boltzmann constant, T, of the multi-frequency terahertz detectorsysNoise temperature, eta, of the antenna system of the multi-frequency terahertz detecting instrument under corresponding specified wave bandsAFor the antenna efficiency of the multi-frequency terahertz detecting instrument under the corresponding specified wave band, AgAnd tau is the integral time of the multi-frequency terahertz detector under the corresponding specified wave band, and deltav is the observation bandwidth of the multi-frequency terahertz detector under the corresponding specified wave band.
Preferably, when the radio source observed on the specified wave band is a solar system external radio source, correcting the limit flow density of the radio source according to the following formula;
Sv1＝Sv0×(1+α％)
in the above formula, Sv1For the corrected limit flow density, S, of the emitter observed over the specified bandv0α is the attenuation rate of the flux density of the emitter, which is the limit flux density of the emitter observed at the prescribed band before correction.
Preferably, when the radio source observed on the specified wave band is a specific celestial body in a solar system, correcting the limit flow density of the radio source according to the following formula;
in the above formula, Sv2For the corrected limit flow density, S, of the emitter observed over the specified band v3Limiting flux density of the emitter observed over a given band before correction, CRIs a celestial solid angle correction factor.
Preferably, the special radio frequency source star table includes basic information and flow density of the radio frequency source observable at each specified wave band, and the basic information of the radio frequency source observable at each specified wave band is: and selecting the basic information and the flux density of the radio sources of which the corrected limit flux density of each specified wave band radio source is not lower than the preset critical value of the limit flux density of the corresponding specified wave band radio source from the basic radio source star chart.
Preferably, the observable radio star watch comprises radio stars and the like in each specified waveband, radio flow density, time appearing in a coordinate system of the multi-frequency terahertz detector and an accurate position.
Preferably, the observation period and the optimal observable radio frequency source of each specified waveband of the multi-frequency terahertz detector are realized by the following steps:
sequencing the flow density of the radio sources in the observable radio source star catalogue, and preferably selecting the radio sources with high flow density;
respectively avoiding the sun, the moon and the peripheral area of the earth;
determining an observation time period of the multi-frequency terahertz detector according to the visibility of the radio source;
In the whole observation period of the radio source, the radio source is always positioned in the observable field of view of the multi-frequency terahertz detecting instrument;
on the basis of meeting the above conditions, according to the calibration requirement of the antenna electric axis of the multi-frequency terahertz detecting instrument, multiple long-distance transmission power sources are preferably selected as the optimal observable power source of the corresponding specified wave band.
According to a second aspect of the embodiments of the present disclosure, there is provided a radio frequency source selection device for calibration of an electrical axis of a stationary track multi-frequency terahertz detector, including a processor and a memory, where the processor reads a computer program or instructions in the memory to perform the following operations:
setting a basic radio source star catalogue;
calculating the limit flow density of the radio source observed on a specified wave band, and correcting the limit flow density of the radio source according to the type of the radio source;
configuring a special radio frequency power source star watch according to the basic radio frequency power source star watch, the corrected limit flow density of the radio frequency power source and a preset critical value of the limit flow density of the radio frequency power source;
forecasting the radio source information appearing in the observable field of view range of the multi-frequency terahertz detector at a certain observation time in the future to generate an observable radio source star catalogue;
And determining the optimal observable power supply of the observation time period and each appointed waveband of the multi-frequency terahertz detector according to the observable power supply star catalogue, the view field of the multi-frequency terahertz detector and the signal integration time constraint, and outputting the basic information of the optimal observable power supply.
According to the method for selecting the power transmission source for calibrating the electric axis of the multi-frequency terahertz detecting instrument for the stationary orbit, which is provided by the embodiment of the disclosure, the special power transmission source star watch is configured according to the set basic power transmission source star watch and the accurate limit flow density of the power transmission source, so that the power transmission source information which can be observed by all appointed wave bands of the multi-frequency terahertz detecting instrument can be obtained, and the power transmission source observation data of all wave bands are provided for calibrating the electric axis of the multi-frequency terahertz detecting instrument in the orbit in real time. In addition, the radio frequency power source information appearing in the range of the observable field of view of the multi-frequency terahertz detecting instrument at a certain observation moment in the future is forecasted, and an observable radio frequency power source star chart is generated, so that the basic information of the optimal observable power source in the observation period and each appointed waveband of the multi-frequency terahertz detecting instrument can be determined, and basic data can be provided for in-orbit calibration of an antenna electric shaft of the multi-frequency terahertz detecting instrument.
Drawings
Fig. 1 is a flowchart of a method for selecting a radio source of a stationary-track multi-frequency terahertz detecting instrument according to an embodiment of the present disclosure.
Detailed Description
The technical content of the disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.
Aiming at the characteristics of small antenna aperture, high working frequency, narrow bandwidth, high antenna temperature, short integration time and the like of the multi-frequency terahertz detector, and based on the purpose of calibrating performance parameters and an electric axis of the multi-frequency terahertz detector, as shown in fig. 1, the embodiment of the invention provides a radio frequency source selection method of the multi-frequency terahertz detector with a stationary track, which comprises the following steps:
and step S1, setting a basic radio source star chart.
The basis for observing the radio-frequency power supply by adopting the multi-frequency terahertz detector is a complete and accurate radio-frequency power supply star watch. There are thousands of star watches internationally, with thousands of radio star watches. However, the existing radio frequency star watch cannot meet the requirements of the multi-frequency terahertz detection instrument on the radio frequency star watch developed at present. Because the radio star tables have the problems of band mismatch, dark and weak celestial bodies, incomplete celestial body measurement parameters, missing of band information of a detection instrument and the like in different degrees, a basic radio star table meeting the requirements of the multi-frequency terahertz detection instrument needs to be preliminarily set, and the basic radio star table comprises basic information of radio sources observed on various bands and flow density of the radio sources observed on specified bands.
Wherein, in the disclosed embodiment, the radio source types include: solar specific celestial bodies such as moon, Venus, Jupiter and Mars, and galaxy internal emission power sources and galaxy external emission power sources such as Taurus and Leos.
Set up the basis radio frequency source star table that satisfies the requirement of multifrequency terahertz detection instrument, include:
and step S11, acquiring the data of the radio source star catalogue, and performing sorting, cross authentication and perfecting to obtain the basic information of the radio sources observed on each band.
The method comprises the steps of finely investigating and collecting all international radio frequency star catalogue data, a radiation model of a solar system specific celestial body and original observation data of the celestial body, sorting, evaluating and reprocessing the data, performing cross certification by combining the original observation data of the solar system specific celestial body between the radio frequency star catalogues aiming at the problem that the radio frequency basic information in the radio frequency star catalogue is not complete, and supplementing the radio frequency basic information which is lacked in the radio frequency star catalogue.
The radiation model of the specific celestial body of the solar system is eight planets in the solar system, each planet corresponds to one radiation model, and eight radiation models are provided. The original observation data of the specific celestial body of the solar system are obtained by observing eight planets in the solar system by using some specific observation equipment respectively; for example, observing equipment on the ground and observing equipment in space are adopted to observe eight planets in the solar system, and original observation data of each planet is obtained.
It should be noted that the basic information of the radio source observed in each band includes one or more of the name of the radio source, position accuracy, brightness, radiation information, motion speed, stability, right ascension, declination, pointing angle, and observation time. In the basic information of the radio sources observed on each wave band to be obtained, the basic information of some radio sources is provided completely by the radio source star tables, the basic information of some radio sources is incomplete, other radio source star tables are required to be utilized for cross authentication, and the basic information of the radio sources observed on each wave band related to complete observation equipment is obtained based on a radiation model of a specific celestial body of a solar system and original observation data of the celestial body.
In an embodiment of the present disclosure, taking a radio frequency source as an example of a golden star, assuming that a certain detector performs two-year observation on the golden star at one or more bands to obtain a corresponding radio frequency source star table, and another detector performs ten-year observation on the golden star at one or more bands to obtain a corresponding radio frequency source star table; in the two radio source star tables obtained by observation, part of observation data are crossed, and the same wave band is used for observing the Venus at one time, but the accuracy of the observation data is different. For such a situation, cross-certification needs to be performed through a plurality of radio source star tables, for example, 5 observation devices respectively observe the star at the same waveband, wherein observation data obtained by 3 observation devices are consistent, and inconsistent observation data obtained by the other two observation devices can be omitted. By adopting the cross authentication method, based on the radiation model of the specific celestial body and the original observation data of the celestial body, cross authentication and information complementation are carried out on all the radio frequency sources, the radio frequency source basic information in the radio frequency source star catalogue is confirmed, and the radio frequency source basic information which is lacked in the radio frequency source star catalogue is complemented, so that the basic information of the radio frequency sources observed on each waveband related to the complete observation equipment is obtained.
And step S12, calculating the flux density of the radio source observed on the appointed wave band according to the basic information of the radio source of each wave band.
Since the flow density of the rf source observed in different bands of the multi-band thz detector is different, the radiation intensity of the rf source in the band specified by the user needs to be selected from the basic information of the rf source observed in each band in step S11, and modeling is performed according to the radiation intensity of the rf source in the band specified by the user and the rf source flow density in the band specified by the user, so as to calculate the rf source flow density in the band specified by the multi-band thz detector. The modeling is a mature technology in the prior art according to the radiation intensity of the radio frequency source of the specified wave band specified by the user and the flux density of the radio frequency source of the specified wave band required by the user, and is not detailed here.
And step S13, combining the basic information of the radio sources of each wave band and the flow density of the radio sources of the appointed wave band to obtain a basic radio source star chart.
And step S2, calculating the limit flow density of the radio source observed on the appointed wave band, and correcting the limit flow density of the radio source according to the type of the radio source.
According to main performance indexes of the multi-frequency terahertz detector, including working frequency, integration time, noise temperature of an antenna system, antenna efficiency, geometric area of an antenna, observation bandwidth and the like, the limit flow density of the radio source observed on the appointed waveband of the multi-frequency terahertz detector is accurately calculated by using a formula (see formula 1) for calculating the limit flow density in the radio astronomy theory, for example, if 10 appointed wavebands exist, the limit flow density of the radio source observed on the 10 appointed wavebands is calculated respectively.
In the above formula, k is Boltzmann constant, T, of the multi-frequency terahertz detectorsysFor the noise temperature, eta of the antenna system of the multi-frequency terahertz detector under corresponding specified wave bandsAFor the antenna efficiency of a multi-frequency terahertz detector at a corresponding specified waveband, AgThe geometric area of an antenna of the multi-frequency terahertz detector is shown, tau is the integration time of the multi-frequency terahertz detector under a corresponding specified waveband, and deltav is the observation bandwidth of the multi-frequency terahertz detector under the corresponding specified waveband.
When the radio sources observed on the specified waveband are solar system external radio sources, the attenuation of the flow density of the radio sources along with time needs to be considered when the limit flow density of the radio sources observed on the specified waveband of the small antenna of the multi-frequency terahertz detector is calculated; based on the attenuation data of the limit flow density of the radio source, the limit flow density of the radio source observed in the specified wave band is corrected by adopting a formula 2.
Sv1＝Sv0×(1+α％) (2)
In the above formula, Sv1For the corrected limit flow density, S, of the emitter observed over the specified bandv0α is the attenuation rate of the flux density of the emitter, which is the limit flux density of the emitter observed at the prescribed band before correction.
When the radio source observed on the specified waveband is a specific celestial body in a solar system, when the limit flow density of the radio source observed on the specified waveband of the small antenna of the multi-frequency terahertz detector is calculated, the change of a solid angle of the celestial body along with time during observation and the correction of the angle size of the celestial body need to be considered, and formula 3 is adopted to respectively correct the limit flow density of the radio source observed on the specified waveband.
In the above formula, Sv2For the corrected limit flow density, S, of the emitter observed over the specified bandv3Limiting flux density of the emitter observed at the specified band before correction, CRIs a celestial body solid angle correction factor.
And step S3, configuring a special radio frequency source star chart according to the basic radio frequency source star chart, the corrected limit flow density of the radio frequency source and a preset critical value of the limit flow density of the radio frequency source.
Compared with the antenna for conventional astronomical observation, the antenna for the multi-frequency terahertz detector has the characteristics of small caliber, high working frequency, narrow bandwidth, high antenna temperature and short integration time, and can detect the flux of celestial bodies exceeding the flux intensity of most conventional celestial bodies, so that the configuration of a special radio source star watch is necessary.
The configuration special radio frequency star table comprises basic information and flow density of the radio frequency source observable in each appointed waveband of the multi-frequency terahertz detection instrument, wherein the basic information and the flow density of the radio frequency source observable in each appointed waveband can be collectively referred to as radio frequency source information observable in each appointed waveband. The radio frequency power source information observable at each designated waveband of the multi-frequency terahertz detector is acquired from the basic radio frequency power source star watch in step S1. That is, the basic information and the flow density of the radio source matched with the performance requirement of the multi-frequency terahertz detector at each specified waveband are acquired from the basic radio source star table in step S1.
Specifically, the basic information of the observable radio frequency source of each specified waveband of the multi-frequency terahertz detector is as follows: and selecting the basic information and the flow density of the radio sources of which the corrected limit flow density of each radio source in the specified waveband is not lower than the preset critical value of the limit flow density of the radio source in the corresponding specified waveband from the basic radio source star table. The preset critical value of the limit flow density of each specified waveband radio source is adjusted according to the observation capability of the multi-frequency terahertz detector; for example, the observation time and the integration time of the multi-frequency terahertz detector are adjusted, so that the observation capability of the multi-frequency terahertz detector is correspondingly improved or reduced, and the critical value of the limit flow density of the radio source in each specified waveband is correspondingly adjusted.
And step S4, forecasting the radio source information appearing in the range of the observable field of view of the multi-frequency terahertz detector at a certain observation time in the future, and generating an observable radio source star watch.
Based on the special radio star watch configured in step S3, according to the satellite orbit parameters and the observation field constraints of the multi-frequency terahertz detector, the observation time related to the special radio star watch and the corresponding position information of the radio source are subjected to a series of time conversion and coordinate conversion to complete correction of various errors, and the radio source information appearing in the range of the observable field of the multi-frequency terahertz detector is predicted to generate the observable radio star watch. The observable radio star watch comprises radio stars and the like in each specified waveband, radio flow density, time appearing in a coordinate system of the multi-frequency terahertz detector and accurate positions. The time conversion process involved therein comprises: when transitioning from coordinated world time to international atomic time, from international atomic time to coordinates in the earth-centered celestial sphere reference system, etc.; the coordinate conversion process involved includes: from the international celestial sphere reference frame to the geocentric celestial sphere reference frame, from the geocentric celestial sphere reference frame to the satellite station celestial sphere reference frame, from the satellite station celestial sphere reference frame to the probe ideal coordinate frame, from the probe ideal coordinate frame to the probe metrology coordinate frame, etc.
For a certain future observation time, the forecasting of the observation position of the radio source involves the deflection of various astronomical effects on light (electromagnetic waves) and complex transformation of a coordinate system, and the conversion of various time systems, and errors can be introduced by slight careless mistakes. In addition, the calculation and forecasting processes of the observation positions of the celestial bodies outside and inside the solar system are inconsistent, and different methods are needed to be used for processing the observation positions and the forecasting processes respectively. Therefore, celestial bodies inside and outside the solar system are respectively processed, various astronomical effects of electromagnetic waves from the celestial bodies to an observer are considered carefully, and under a generalized relativistic space-time system, calculation is carried out strictly according to a celestial body observation position reduction process and a high-precision relativistic model in basic celestial body measurement, so that the calculation precision of the observation position of the radio source is superior to tens of milli-angular seconds.
And step S5, determining the optimal observable power supply of the observation time period and each appointed waveband of the multi-frequency terahertz detector according to the observable power supply star catalogue and the visual field and signal integration time constraint of the multi-frequency terahertz detector, and outputting the basic information of the optimal observable power supply.
Considering the visibility of the radio sources for the observable power star catalogue of the multi-frequency terahertz detecting instrument at a certain observation time in the future obtained in step S4, an optimal radio source selection strategy is further set according to the observable power star catalogue and the field-of-view constraint and the signal integration time constraint of the multi-frequency terahertz detecting instrument, and the shielding effects (including avoidance of the sun on a pointing path) of the sun, the moon, the earth and the like are removed, so that the optimal observable power source at each designated waveband is determined, and basic information of the optimal observable power source is output. The key point is that the observation time of the multi-frequency terahertz detector and the optimal observable power supply of each appointed waveband are determined according to the visibility of the radio power supply because all wavebands of the multi-frequency terahertz detector have less observable radio power supply resources.
Specifically, the method for setting the optimal radio frequency power source selection strategy comprises the following steps:
and step S51, sequencing the flux density of the radio sources in the observable radio source star chart, preferably selecting the high flux density.
Step S52, avoiding the sun, the moon, and the peripheral region of the earth, respectively;
in order to protect the multi-frequency terahertz detector and improve the observation quality, the peripheral areas of the sun and the moon need to be avoided; to avoid the influence of the atmosphere of the earth, the peripheral region of the earth needs to be avoided.
And step S53, determining the observation time interval of the multi-frequency terahertz detector according to the visibility of the radio source.
Step S54, during the whole period of observing the radio source, it is necessary to ensure that the radio source to be observed is always within the observable field of the detector.
And S55, on the basis of meeting the conditions of the steps S51-S54, preferably selecting multiple long-distance radio sources as the optimal observable radio sources of corresponding specified wave bands according to the calibration requirements of the antenna electric axis of the multi-frequency terahertz detector.
On the basis of meeting the conditions of the steps S51-S54, according to the calibration requirement of the electric axis of the multi-frequency terahertz detector, the position distribution of the radio sources in the space is further considered, and by utilizing the principle that the distribution of the radio sources is wider, the calibration error of the electric axis is smaller, a plurality of radio sources with longer distances are preferably used as the optimal observable radio sources with corresponding specified wave bands, namely, the distance between each radio source is longer.
When the satellite is observed in an orbit, according to the time requirement of a positioning task and the visibility of a radio source, the basic information of each radio source is output according to the radio source selection results of the steps S51-S55 in a specific time period, radio source observation instruction parameters are generated and sent to the satellite, the multi-frequency terahertz detector is guided to carry out in-orbit radio source observation in each specified waveband, so that the radio source remote sensing data of each specified waveband are obtained, and basic data are provided for in-orbit calibration of an antenna electric axis of each specified waveband of the multi-frequency terahertz detector and high-precision positioning processing of the antenna electric axis.
Further, the embodiment of the disclosure also provides a radio frequency power selection device for calibrating the electric axis of the multi-frequency terahertz detector for the stationary orbit, which comprises a processor and a memory, and further comprises a communication assembly, a sensor assembly, a power assembly, a multimedia assembly and an input/output interface according to actual needs. The memory, the communication component, the sensor component, the power supply component, the multimedia component and the input/output interface are all connected with the processor. As mentioned above, the memory may be Static Random Access Memory (SRAM), Electrically Erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), magnetic memory, flash memory, etc.; the processor may be a Central Processing Unit (CPU), Graphics Processing Unit (GPU), Field Programmable Gate Array (FPGA), application specific integrated circuit (AS IC), Digital Signal Processing (DSP) chip, etc. Other communication components, sensor components, power components, multimedia components, etc. may be implemented using common components found in existing smartphones and are not specifically described herein.
On the other hand, in the radio frequency source selection device for calibrating the electric axis of the multi-frequency terahertz detector for the stationary orbit, the processor reads a computer program or instructions in the memory and is used for executing the following operations:
and setting a basic radio source star catalogue.
And calculating the limit flow density of the radio frequency source observed on the specified wave band, and correcting the limit flow density of the radio frequency source according to the type of the radio frequency source.
And configuring a special radio frequency star watch according to the basic radio frequency star watch, the corrected limit flow density of the radio frequency source and a preset critical value of the limit flow density of the radio frequency source.
And forecasting the radio source information appearing in the range of the observable field of view of the multi-frequency terahertz detector at a certain observation time in the future to generate an observable radio source star watch.
And determining the optimal observable power supply of the observation time period and each specified waveband of the multi-frequency terahertz detector according to the observable power supply star watch, the view field of the multi-frequency terahertz detector and the signal integration time constraint, and outputting the basic information of the optimal observable power supply.
According to the method for selecting the power transmission source for calibrating the electric axis of the multi-frequency terahertz detection instrument for the stationary orbit, which is provided by the embodiment of the disclosure, the special power transmission source star watch is configured according to the set basic power transmission source star watch and the accurate limit flow density of the power transmission source, so that the power transmission source information which can be observed by all the appointed wave bands of the multi-frequency terahertz detection instrument can be obtained, and the power transmission source observation data of all the wave bands can be provided for calibrating the electric axis of the multi-frequency terahertz detection instrument in real time on the orbit. In addition, the satellite orbit, the observation field of view constraint of the multi-frequency terahertz detector, the deflection of electromagnetic waves caused by various astronomical effects, the conversion of various coordinate systems, the conversion of various time systems and the calculation of observation positions of celestial bodies outside and inside the solar system are fully considered, the power supply information appearing in the observable field range of the multi-frequency terahertz detector at a certain observation time in the future is forecasted, and an observable power supply star chart is generated, so that the optimal observable power supply basic information of the observation time period and each specified waveband of the multi-frequency terahertz detector can be determined, and basic data can be provided for the in-orbit calibration of the antenna shaft of the multi-frequency terahertz detector.
The radio source selection method for calibrating the electric axis of the multi-frequency terahertz detector for the stationary orbit provided by the disclosure is described in detail above. It will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the disclosure.
Claims (9)
1. A radio source selection method for calibrating an electric axis of a multi-frequency terahertz detector for a stationary track is characterized by comprising the following steps:
setting a basic radio source star catalogue;
calculating the limit flow density of the radio source observed on a specified wave band, and correcting the limit flow density of the radio source according to the type of the radio source;
configuring a special radio frequency power source star watch according to the basic radio frequency power source star watch, the corrected limit flow density of the radio frequency power source and a preset critical value of the limit flow density of the radio frequency power source;
forecasting the radio source information appearing in the range of the observable field of view of the multi-frequency terahertz detector at a certain observation time in the future to generate an observable radio source star catalogue;
according to the observable power source star watch, the view field of the multi-frequency terahertz detector and the signal integration time constraint, determining the optimal observable power source of the observation time period and each appointed wave band of the multi-frequency terahertz detector, and outputting the basic information of the optimal observable power source,
The multi-frequency terahertz detector is used for observing the optimal observable radio frequency source in the time interval and each specified waveband, and the implementation process comprises the following steps:
sequencing the flow density of the radio sources in the observable radio source star catalogue, and selecting the radio sources with high flow density;
respectively avoiding the sun, the moon and the peripheral area of the earth;
determining an observation time period of the multi-frequency terahertz detector according to the visibility of the radio source;
in the whole observation period of the radio source, the radio source is always positioned in the observable field of the multi-frequency terahertz detector;
on the basis of meeting the conditions, multiple long-distance radio sources are selected as the optimal observable radio source of the corresponding specified wave band according to the calibration requirement of the antenna electric axis of the multi-frequency terahertz detector.
2. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 1, wherein:
the basic radio frequency source star watch is set, and the implementation process is as follows:
acquiring the star catalogue data of the radio sources, and performing sorting, cross authentication and perfecting to obtain basic information of the radio sources observed on each waveband;
calculating the flux density of the radio source observed on the appointed wave band according to the basic information of the radio source of each wave band;
And combining the basic information of the radio frequency source and the flow density of the radio frequency source to obtain the basic radio frequency source star catalogue.
3. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 2, wherein:
the basic information of the radio source observed on each band includes one or more of the name, position accuracy, brightness, radiation information, motion speed, stability, right ascension, declination, pointing angle, and observation time of the radio source.
4. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 1, wherein:
calculating the limit flow density of the radio frequency source observed on a specified wave band according to the following formula;
in the above-mentioned formula, the compound has the following structure,
is the boltzmann constant of the multi-frequency terahertz detecting instrument,
for the noise temperature of the antenna system of the multi-frequency terahertz detecting instrument under the corresponding specified waveband,
for the antenna efficiency of the multi-frequency terahertz detecting instrument under the corresponding specified wave band,
the geometric area of the antenna of the multi-frequency terahertz detector,
for the integration time of the multi-frequency terahertz detecting instrument under the corresponding specified waveband, 
And the bandwidth is the observation bandwidth of the multi-frequency terahertz detecting instrument under the corresponding specified wave band.
5. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 1, wherein:
when the radio source observed on the appointed wave band is a solar system external radio source, correcting the limit flow density of the radio source according to the following formula;
in the above formula, the first and second carbon atoms are,
for the corrected limit flow density of the rf source observed over the specified band,
α is the attenuation rate of the flux density of the emitter, which is the limit flux density of the emitter observed at the prescribed band before correction.
6. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 1, wherein:
when the radio source observed on the appointed wave band is a specific celestial body in a solar system, correcting the limit flow density of the radio source according to the following formula;
in the above formula, the first and second carbon atoms are,
for the corrected limit flow density of the rf source observed over the specified band,
to achieve the limit flow density of the rf source observed over the specified band prior to correction,
is a celestial body solid angle correction factor.
7. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 1, wherein:
The special radio frequency star table comprises basic information and flow density of radio frequency sources observable at each specified waveband, wherein the basic information of the radio frequency sources observable at each specified waveband is as follows: and selecting the basic information and the flux density of the radio sources of which the corrected limit flux density of each specified wave band radio source is not lower than the preset critical value of the limit flux density of the corresponding specified wave band radio source from the basic radio source star chart.
8. The method for selecting the radio source for calibrating the electric axis of the stationary orbit multi-frequency terahertz detector as claimed in claim 1, wherein:
the observable power star watch comprises the power stars and the like of each specified waveband, the power flux density, the time appearing in the coordinate system of the multi-frequency terahertz detector and the accurate position.
9. A radio frequency power selection device for calibrating an electric axis of a multi-frequency terahertz detector for a stationary track comprises a processor and a memory, wherein the processor reads a computer program or instructions in the memory and is used for executing the following operations:
setting a basic radio frequency star catalogue;
calculating the limit flow density of the radio source observed on the appointed wave band, and correcting the limit flow density of the radio source according to the type of the radio source;
Configuring a special radio frequency source star catalogue according to the basic radio frequency source star catalogue, the corrected limit flow density of the radio frequency source and a preset critical value of the limit flow density of the radio frequency source;
forecasting the radio source information appearing in the range of the observable field of view of the multi-frequency terahertz detector at a certain observation time in the future to generate an observable radio source star catalogue;
according to the observable power source star watch, the view field of the multi-frequency terahertz detector and the signal integration time constraint, determining the optimal observable power source of the observation time period and each appointed wave band of the multi-frequency terahertz detector, and outputting the basic information of the optimal observable power source,
the multi-frequency terahertz detector is used for observing the optimal observable radio frequency source in the time period and each specified waveband, and the implementation process comprises the following steps:
sequencing the flow density of the radio sources in the observable radio source star catalogue, and selecting the radio sources with high flow density;
respectively avoiding the sun, the moon and the peripheral area of the earth;
determining an observation time period of the multi-frequency terahertz detector according to the visibility of the radio source;
in the whole observation period of the radio source, the radio source is always positioned in the observable field of the multi-frequency terahertz detector;
On the basis of meeting the conditions, multiple long-distance radio sources are selected as the optimal observable radio source of the corresponding specified wave band according to the calibration requirement of the antenna electric axis of the multi-frequency terahertz detector.
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