CN107147469B - System for early warning solar radio outbreak interference satellite communication based on air-ground joint survey - Google Patents
System for early warning solar radio outbreak interference satellite communication based on air-ground joint survey Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
Abstract
The invention discloses a system for early warning that solar radio outbreak interferes with satellite communication based on air-ground joint survey, which comprises a high-energy ray detector system, a land-based solar radio telescope and a computer, wherein the high-energy ray detector system is carried on an in-orbit satellite platform; aiming at the physical nature that X-ray explosion and radio explosion are asynchronous, a high-energy ray detector system and a ground-based solar radio telescope which are carried on an on-orbit satellite platform are established, and a threshold information intercommunication mechanism is arranged, when the observed flow of a certain frequency band exceeds a threshold, information is sent to an observation system of another frequency band, relevant preparation is made, the device can obtain more accurate and reliable early warning information, the early warning time is prolonged, and the early warning effect is improved.
Description
Technical Field
The invention belongs to the field of satellite operation monitoring, and particularly relates to an early warning and forecasting system for solar radio outbreak interference satellite signal events.
Background
The sun is the star closest to the earth, and when transmitting light and heat to the earth, its activities also affect the production and life of human beings in various aspects, and the technical system with higher and higher human dependence.
Mankind is currently primarily dependent on radio waves for planetary ground-to-air communication, with frequencies ranging from several MHz up to tens of GHz. The international widely used global satellite navigation positioning system (GPS, GLONASS, beidou and the like) provides positioning, time service and other services for ground equipment through a plurality of satellites, and plays a great role in the fields of military affairs, scientific investigation, drilling of marine oil and gas fields and the like. The transmitting power of the navigation satellite is only about ten watts to dozens of watts generally, and the used frequency bands are generally in L and S frequency bands. When the navigation radio wave reaches the ground, the received signal power is only about-130 dBm, and the strength is very weak, so the received signal on the ground is easily interfered by the surrounding environment. Except artificial intentional interference, two main interference sources of navigation satellite signals in nature are provided, one is that when GPS signals pass through an ionized layer, small-scale irregular bodies in the ionized layer cause scattering of radio waves, and rapid irregular fluctuation and fluctuation of the strength and phase of the navigation signals are caused, and the phenomenon is called ionized layer flicker; the other is direct interference from solar radiation. During a solar radio storm, the solar radio radiation (radio) will suddenly increase greatly, and if the burst frequency band covers the frequency of the navigation signal, radio interference of different degrees will be caused to the GPS, mainly manifested as a decrease in the signal-to-noise ratio. Observation shows that strong solar radio burst can significantly interfere with the reception of navigation electric waves, and can cause the receiver to lose lock and even completely interrupt in severe cases, so that the application system loses basic functions of navigation, positioning, time service and the like. Therefore, the problem of solar radio noise interference including the American GPS and the Beidou system in China is always an important influence factor influencing the performance of the satellite navigation system.
The radiation intensity of the solar radio burst reaches a quiet time (about 100s.f.u.,1s.f.u. = 10) -22 w/Hz m 2 ) Tens or even thousands of times. Taking the outbreak of 3, 5 days 2012 as an example, the radiation intensity at the frequency points of 1.0 and 2.0GHz respectively reaches 501812 and 18958s.f.u.
The minimum threshold for the flow of a radio storm affecting GPS is generally considered to be around 4000s.f.u.a series of events, with two strong L-band solar radio bursts on days 12 and 13 in 2006, occurring on the sun day 12. Fig. 3-4 show the solar radio flow, carrier-to-noise ratio variation, the number of GPS satellites that can be received by a single station, global ground station loss of lock, positioning error, and the like of two GPS communication frequency points L1 and L2, and it is found that the variation of the radio flow at the two frequency points has a good positive correlation with the carrier-to-noise ratio.
The existing observation frequency point data are used for counting the relation between the flow abnormity of the solar activity and the GPS signal lock losing time at different frequency points, the maximum correlation between the solar radio flow abnormity at the 1415MHz frequency and the GPS navigation signal lock losing can be easily found, the correlation is closely related to the GPS working frequency band, and the result is shown in figure 5.
Fig. 6 shows that during this radio storm, the GPS stations in kunming, taiwan, wuhan, and beijing in our country are obviously unlocked, and the multiple stations and multiple GPS satellite signals are completely interrupted for 6 minutes, and during the radio storm, the number of satellites locked by the multiple stations is less than 4, so that the GPS real-time positioning service is completely disabled.
We have roughly counted the solar Radio outbreaks observed during the maximum 6 years in 23 weeks peak years (2000-2005) in japanese wild Bian Shan Radio telescopes (Nobeyama Radio Polarimeters). Of the 456 bursts observed, 75 had higher flows than 1000s.f.u., and a total of 37 had higher flows than 1000s.f.u. in the low frequency band (1.0, 2.0 and 3.75 GHz). Considering that NORP observes 9 hours per day, as calculated in 24 hours, the number of annual outbreaks that can affect GPS during the peak annual maximum is approximately 16. This is considerable, both in intensity and frequency, and visible solar radio bursts are one of the inevitable influencing factors of satellite navigation communication.
Disclosure of Invention
The invention aims to provide a system for early warning that solar radio outbreak interferes with satellite communication based on air-ground joint measurement, which is mainly suitable for observing solar outbreak events from a plurality of energy sections and early warning the influence of the solar outbreak on satellite communication signals in a microwave frequency band through abnormity of flow of different energy sections.
Technical theory analysis:
1. analyzing the influence of the solar radio explosion signal on each wave band wireless communication signal:
the noise introduced by the solar radio explosion can be regarded as noise which is externally superposed into a receiver system in a communication system, and if the noise is smaller than the noise of the original system, the interference is below the system noise and is 'submerged' in the original system noise; has little effect on the signal-to-noise ratio. If the system noise is larger than or equal to the original system noise, the original system noise will be increased, and the system noise temperature of the communication system working under the normal temperature condition (290K) is calculated to be equivalent to a solar energy value so as to determine that the communication system is potentially influenced when the solar energy burst flow density exceeds the value.
Assuming that the operating bandwidth of a communication system is B Hz and the operating temperature is T (unit: kelvin), the external noise power to the receiver is:
P＝kTB (1)
where k is the boltzmann constant: k =1.3806505 × 10-23;
various random noises F (unit: W/m) 2 ) The noise power introduced into the antenna is:
where G is the antenna gain in dB; λ is the observation wavelength in m; let us assume the receiver equivalent solar activity flow rate, unit SFU,1s.f.u =10 -22 W/m 2 /Hz；
F＝B*F eq (3)
And (3) simultaneous resolution to obtain:
then
F eq ＝8π*kT/(Gλ 2 ) (independent of bandwidth! ) (6)
F sfu ＝8π*kT/(Gλ 2 )*10 22 (7)
Or F sfu ＝8π*kT*f 2 /(G*c 2 )*10 22 (8)
The conversion of the external noise flow density of the receiving system into the equivalent solar radio flow density from the equations (7) and (8) is inversely proportional to the antenna gain G, inversely proportional to the square of the operating wavelength λ, or proportional to the square of the operating frequency f, which means that:
1. when the antenna gain G is higher, the system noise flow density is lower when converted into an equivalent solar radio flow density level, and the smaller the solar radio burst, the more easily the external noise is raised, for example, the influence on a common handheld device (small antenna) is smaller than that on a large ground station device (large antenna);
2. if the antenna with the same gain G works in a communication system with different frequencies and lower frequencies, the solar radio equivalent flow density converted from the external noise flow density is lower, so that when solar radio is burst, the lower radio flow is easier to cause the increase of external noise, and the communication of the low frequency band is easier to be influenced;
3. for the same antenna, due to different antenna radiation patterns, the influence on the same antenna is different when the included angle between the antenna direction and the sun changes;
FIG. 7 is a graph of the power spectral density of noise in different communication modes in a bandwidth of 10MHz to 20GHz converted into an equivalent solar radio current power spectral density value (assuming an antenna operating at G =10 dB);
in summary, we count the noise equivalent solar flow of several typical communication modes (below 10 GHz) and receivers in the form of antennas:
1. short-wave Communication (Short-wave Communication): the frequency range is 3 MHz-30 MHz, the solar radio signals of the communication frequency band can reach the receiving equipment only by the reflection of the ionized layer, generally are blocked by the ionized layer and can not reach the earth surface, so the influence of the solar radio explosion signals is hardly influenced;
2. microwave Communication (Microwave Communication): the communication is carried out by using electromagnetic waves with the frequency of 300 MHz-3 THz, and comprises ground microwave relay communication, troposphere scattering communication, satellite communication, space communication and mobile communication working in a microwave band;
the communication mobile phone which is most frequently used in daily life generally works in GSM frequency bands (900-950 MHz and 1800 MHz), CDMA frequency bands (820-900 MHz), a general mobile phone antenna adopts a microstrip antenna mode, the antenna gain G is about 3-8dB, the maximum G wave beam is aligned to the sun through a formula (8), the external noise is converted into equivalent solar flow of about 1100SFU-1300SFU (< 1 GHz) and 3400SFU (1.8 GHz), meanwhile, a mobile phone communication base station generally adopts a horn antenna, the gain G is between 12-18dBi, the maximum G wave beam is aligned to the sun through the formula (8), the external noise is converted into equivalent solar flow of about 600SFU, but when the mobile phone is used, the maximum G wave beams of the mobile phone and the base station antenna are not aligned to the sun generally, the power of a solar radio explosion signal entering a receiver through the antenna is very low, and therefore, the influence of the mobile phone communication signal caused by solar radio explosion is very low;
in addition, much wifi is used in daily life, bluetooth (Bluetooth) works at 2.4-2.485GHz, the short-distance data exchange among fixed equipment, mobile equipment and a building local area network is mainly aimed at, the possibility of being subjected to solar radio radiation is very low, the transmission distance is short, the transmission power is higher than the solar radio flow, and the influence of solar radio outbreak cannot be caused generally;
for deep space communication, the target is equipment such as satellites, space ships, space stations and the like in space, the communication mode determines that solar radio signals may enter the system through the antenna, and the use frequencies are mainly divided into the following:
table 1 radio division table for deep space research
Through the analysis of equation (8), the external noise of the receiving system is converted into the equivalent solar flow rate as being inversely proportional to the antenna gain G, inversely proportional to the square of the operating wavelength λ, or proportional to the square of the operating frequency f. For 5GHz-10GHz communication signals, the receiver noise is converted to signals with equivalent solar flow exceeding 19000SFU, the signals with communication frequency of 10GHz or above are converted to signals with equivalent solar flow exceeding 50000SFU, and according to statistics of a Nobeyama solar radio astronomical stage: in recent 10 years, events that the flow of solar radio bursts exceeds 25000SFU in a plurality of monitoring frequency bands (9.4 GHz,17GHz and 35GHz) above 5GHz do not exist, which shows that the probability that the flow of the solar radio bursts exceeds a threshold event above 5GHz is small, and the influence of the solar radio bursts on deep space communication above 5GHz is not large. But has some impact on S-band (2-3 GHz) communication signals.
For communication between the navigation communication systems mainly working in the L-S frequency band, namely between the ground and the air, the working frequencies of some main navigation systems are as follows:
TABLE 2 operating frequencies of different frequency bands of each navigation system
Statistics show that the solar radio outbreak exceeding 1SFU in the peak of solar activity is about 49.31 times per year, and the solar radio outbreak exceeding 1SFU in the quiet solar year is about 7.03 times per year, as shown in FIG. 8:
since the 24 th sun (beginning in 2010), the flow rate at each spot frequency of 1GHz 2GHz 3.75GHz 9.4GHz17GHz was determined by several solar radiogram outbreaks (data source Japanese wild Bian Shan solar radioastronomical stage)
TABLE 3 statistical table of the intense radio explosions since the 24 th solar week (beginning of 2010)
In summary, we have found that the X-band is hardly affected by any effect during solar radio bursts, whereas the navigation communication signals in the L-S band are most susceptible to solar radio burst events.
For this purpose, we select the X wave band (8-9 GHz) as the signal transmission load working band of the space monitoring satellite.
2. Theoretical analysis with early warning in X-ray observation
The X-ray is an important wave band observed by the sun, most of the X-ray is observed during solar flare outbreak, and the relationship between the X-ray flux rise and the radio flux rise during the flare outbreak in the 24 th solar activity week is counted as follows:
according to the difference between the X-ray energy spectrum index (spectral index) δ X and the radio frequency spectrum δ r during solar burst, both of them conform to the power law spectrum characteristics, but the radio frequency spectrum becomes more gentle during burst, so during multi-band (radio and high energy) burst flow, the X-ray rises faster than the radio flow and reaches the peak earlier, as shown in fig. 9:
meanwhile, according to observations of Adriana V.R.Silva et al on the moments of multiple solar flare outbreaks, differences of an X-ray energy spectrum delta X and a radio energy spectrum delta r between an impulse outbreak and a Non-impulse outbreak are summarized, wherein delta X is larger than delta r as shown in the following table:
TABLE 4 relationship table between HXR X-Ray and different spectral indexes of microwave frequency band in solar flare outbreak
| Spectral index | All are | impulsive | Non-impulsive |
| δx | 5.8±0.8 | 5.9±0.9 | 5.7±0.6 |
| δr | 4.8±1.0 | 5.1±0.9 | 3.7±0.6 |
| δx-δr | 1.0±1.0 | 0.8±1.0 | 2.0±0.7 |
The time difference between the peak of the microwave burst and the peak of the X-ray burst was also confirmed from an observation angle. According to the time difference between the X-ray flux peak value and the 17GHz radio flux peak value of a plurality of typical solar flare outbreaks in the 23 rd solar activity week, the time difference is found to be consistent with the spectrum index research, namely, the time lag exists between the radio flux peak value and the X-ray peak value; meanwhile, the peak time of two monitoring frequency points of the L \ S wave band is compared with the starting time of the X ray, and the time lag is found to be between 3 and 30 minutes as shown in the following table:
TABLE 5X-ray event time vs. radio-related flux time for multiple typical 23 rd solar activity week
Then, there is a time difference from the start of a flare burst to when the radio flux exceeds the threshold value for interfering with communication, and we count that the time difference between the moment when the X-ray starts to rise, i.e., the flare start burst, and the moment when the radio burst is extremely strong in the 24 th solar activity cycle is as follows:
TABLE 6 time difference between X-ray rise and strong radio-explosion in 24 th solar activity cycle
Through the analysis and statistics, the flow rate of the X-ray is abnormal before the violent solar radio burst reaches an extremely strong value, and the flow rate abnormal point can be used as an early warning point for the solar radio burst to interfere with satellite communication signals, as shown in fig. 10;
in summary, the objective of the present invention is achieved by the following technical solutions:
the system comprises a high-energy ray detector system, a land-based solar radio telescope and a computer, wherein the high-energy ray detector system, the land-based solar radio telescope and the computer are carried on an in-orbit satellite platform, the high-energy ray detector system carried on the in-orbit satellite platform comprises a high-energy ray detector, a signal processor and a transceiver I, the high-energy ray detector is connected with the transceiver I through the signal processor, the transceiver I is connected with the computer through the land-based solar radio telescope, and solar radio current amount data acquired by the land-based radio telescope is transmitted to the computer through a bus.
The ground-based solar radio telescope comprises a radio antenna, an analog receiver system, a calibration system, a transceiver II, more than 3 power-voltage converters and a data acquisition unit; the radio antenna is connected with the analog receiver system through the calibration system, the analog receiver system is connected with the data acquisition unit through the power-voltage converter, the data acquisition unit is connected with the computer through the bus, and the computer is connected with the calibration system; and the transceiver II works independently as a subsystem of the ground-based radio telescope and is respectively connected with the transceiver I, the radio antenna and the computer.
The analog receiver system comprises a first-stage amplifier, a power divider, more than 3 isolators, more than 3 filters I, more than 3 second-stage amplifiers and more than 3 filters II; the first-stage amplifier, the power divider, the isolator, the filter I, the second-stage amplifier and the filter II are sequentially connected, and the filter II is connected with the power-voltage converter.
The calibration system comprises a microwave switch and a noise source, wherein the noise source is connected with the microwave switch, a radio antenna is connected with a first-stage amplifier through the microwave switch, and a computer is connected with the microwave switch and controls the microwave switch to select a calibration mode and an observation mode.
And the filter I and the filter II are both band-pass filters.
The land-based solar radio telescope is communicated with a transceiver I of an aerial high-energy ray detector system through a transceiver II integrated with the land-based solar radio telescope, and the communication frequency band is selected in an X wave band (8-9 GHz).
The system of the invention forecasts the satellite communication event of solar radio burst interference through two parts of measurement data, which comprises the following steps: x-ray and microwave frequency bands; the X-ray detector mainly comprises a high-energy ray detector system payload which is carried on an in-orbit satellite platform, the payload mainly detects solar radiation in a 10KeV-100KeV energy band, and meanwhile, the part is also provided with a communication transceiver (transceiver), and an X (8-9 GHz) band is used as a communication signal transceiving frequency band, so that the influence caused by solar radio explosion is avoided;
the high-energy ray detector is responsible for detecting the solar X-ray flow and sending detection data to the signal processor, the signal processor judges whether flare outbreak occurs or not through analysis of data intensity, if the flare outbreak occurs, a signal is sent back to a ground receiving station through the transceiver I, the transceiver I adopts an 8-9GHz frequency band to carry out communication between the sky and the ground, and the L \ S (1-4 GHz) and other wave bands which are easy to suffer from solar radio outbreak are avoided.
The solar radiation of microwave frequency band is mainly completed by a ground-based solar radio telescope working in L-S wave band, and the telescope has the functions of precise observation, calibration and the like; meanwhile, the system integrates a transceiver II, and an X (8-9 GHz) wave band is used as a communication signal transceiving frequency band, so that the influence caused by solar radio outbreak is avoided, and meanwhile, the interference on a solar radio receiver part can also be avoided; the part works in L \ S two wave bands to monitor the solar radio flow, and when the abnormal flow is found, early warning information is sent out.
The two parts adopt a satellite-ground communication mode to carry out data notification, for example: when the flow rate of a certain energy section is abnormal, the communication transceiver is adopted to inform another subsystem of the possible solar radio outbreak.
In the aspect of a combined early warning method, aiming at the physical nature that X-ray outbreak and radio-frequency outbreak are asynchronous, a high-energy ray detector system and a land-based solar radio telescope which are carried on an in-orbit satellite platform are provided with threshold information intercommunication mechanisms, and when a certain system observes that the flow exceeds a threshold value, information is sent to the other system, and relevant preparation is made.
The key points are as follows:
1. according to the existing research literature, when solar flares are active, the time difference exists between the rise of the X-ray flow and the arrival of the radio-induced explosion to the maximum value, and the time difference is from 2 minutes to 1 hour, so that the rise point of the X-ray flow can be used as an early warning point of the solar radio-induced explosion;
2. the land-based solar radio telescope is the most direct measurement mode, but the early warning time is short, the early warning time is easy to be interfered by radio, the total power of observation data of a plurality of point frequencies is respectively monitored and calibrated by observing the flow of the point frequencies in an L-S waveband, the precision reaches 1S.F.U, meanwhile, the aim of determining whether the solar radio outbreak occurs is fulfilled, and in order to avoid the radio interference, the solar radio outbreak can be determined only when the flow of the point frequencies is abnormal;
3. meanwhile, for the event that the rise of a small part of radio flow is earlier than that of X-ray flow, the ground-based subsystem and the space subsystem are integrated with communication transceivers to form a data intercommunication mechanism; according to the derivation of the formula (8), the higher the communication frequency is, the smaller the interference signal generated by solar radio explosion is, and therefore, an 8-9GHz frequency band is adopted as the communication signal;
the invention has the beneficial effects that: by adopting observation data of two different energy sections, more accurate and reliable early warning information can be obtained; meanwhile, the early warning time is obtained by utilizing the difference of the spectral indexes, so that the early warning time is prolonged, and the early warning effect is improved.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic diagram of an analog receiver system according to the present invention;
FIG. 3 shows the L1 frequency point carrier-to-noise ratio drop and the change of the number of visible stars with the solar activity of the ZHU-WAAS GPS ground station at 12.2006, 6.2006, the left graph shows the drop of the carrier-to-noise ratio, and the right graph shows the change of the number of visible stars with the solar activity;
FIG. 4 shows the unlocking condition and the positioning error of the global GPS geodetic station of the solar radio activity in 2006, 12 and 6, wherein A shows the unlocking condition and B shows the positioning error;
FIG. 5 is a graph of the correlation between different frequency solar radio activity and navigation satellite signal loss of lock;
FIG. 6 shows the variation of the number of GPS station locking satellites in China and in Australia with time during the 13-month-13-day radio storm in 2006, wherein the diagram A is China and the diagram B is Australia;
FIG. 7 is an equivalent solar radiation current value of a normal temperature communication receiver with a noise floor of 10 MHz-5 GHz;
FIG. 8 is a graph of the probability of outbreaks occurring at the peak year of solar activity and at different rates of calm;
FIG. 9 is a graph of the difference in change between the X-ray and the radiant flux spectral indices in solar flare bursts;
FIG. 10 is a schematic diagram of the use of X-ray flow anomalies for early warning.
FIG. 11 is a schematic view of a targeting procedure;
fig. 12 is a schematic diagram of the relationship of the power of the quiet sun, the cold air, the noise source and the matching terminal.
Detailed Description
The invention is illustrated in greater detail below with reference to the figures and examples, without however restricting the scope of the invention to the details given, unless otherwise specified, in conventional apparatus and in conventional manner of implementation and control.
Example 1: as shown in fig. 1-2, the system for early warning of interference of solar radio outbreak to satellite communication based on air-ground joint survey comprises a high-energy ray detector system, a land-based solar radio telescope and a computer, wherein the high-energy ray detector system comprises a high-energy ray detector, a signal processor and a transceiver I;
in the system, a high-energy ray detector system and a land-based solar radio telescope which are mounted on an on-orbit satellite platform carry out data notification in a satellite-ground communication mode, for example: when the flow rate is abnormal in a certain energy section, the respective transceiver is adopted to inform another system of the possible solar radio burst.
The X-ray detection part is mainly completed through a payload of a high-energy ray detector system carried on an in-orbit satellite platform, the payload mainly detects solar radiation in a 10KeV-300KeV energy band, meanwhile, the X-ray detection part is also provided with a data sending load, and an X (8-9 GHz) band is used as a communication signal receiving and sending frequency band, so that the influence caused by solar radio explosion is avoided; and early warning information is sent to the navigation ground station and the land-based solar radio telescope through the data sending load.
The ground-based solar radio telescope comprises a radio antenna, an analog receiver system, a calibration system, a transceiver II, 3 power-voltage converters and a data acquisition unit; the radio antenna is connected with the analog receiver system through the calibration system, the analog receiver system is connected with the data acquisition unit through the power-voltage converter, the data acquisition unit is connected with the computer, and the computer is connected with the calibration system; the transceiver II is respectively connected with the transceiver I, the radio antenna and the computer; the analog receiver system comprises a first-stage amplifier, a power divider, 3 isolators, 3 filters I, 3 second-stage amplifiers and 3 filters II; the first-stage amplifier, the power divider, the isolator, the filter I, the second-stage amplifier and the filter II are sequentially connected, the filter II is connected with the power-voltage converter, the output of the power-voltage converter is connected with the data acquisition unit, and the data acquisition unit is connected with the computer through a bus to transmit data; the calibration system comprises a microwave switch and a noise source, wherein the noise source is connected with the microwave switch, and the computer is connected with the microwave switch to control, switch, select a calibration mode and an observation mode; and the filter I and the filter II are both band-pass filters.
The radio antenna mainly adopts an equatorial prime focus type antenna with a paraboloid structure to receive the solar radio radiation flow in an L wave band (1.0 GHz-1.8 GHz), and simultaneously, the radio antenna also receives the solar radio signal with 2.84GHz as the central frequency within +/-5 MHz bandwidth.
The main indexes are as follows:
1. diameter: 4.5 m;
2. polarization mode: double circular polarization;
3. the working bandwidth is as follows: 1.0GHz-1.8GHz,2.84GHz +/-5 MHz;
4. antenna gain: the 1.0GHz-1.8GHz section is more than or equal to 30dBi; the 2.84GHz +/-5 MHz section is more than or equal to 35dBi;
5. tracking precision: 1/10-1/15 beam width;
6. tracking range: the right ascension plus or minus 120 degrees and the declination plus or minus 30 degrees;
7. tracking speed: earth rotation speed + fast motion (30 °/min).
The analog receiver system adopts broadband amplification and multipoint frequency filtering to gate a narrow-band frequency band without radio interference, the frequency band between 4 MHz and 10MHz is determined according to a radio environment, a first-stage broadband low-noise amplifier is used for primarily amplifying a signal, a narrow-band filter is used for gating a frequency band to be monitored, a second-stage amplifier is used for further amplifying the signal, a narrow-band filter is used for gating the frequency band to be monitored, power-voltage detection conversion is used for converting signal power into a corresponding voltage signal, a multi-channel data acquisition unit is used for acquiring the voltage signal, and the voltage signal is transmitted to an upper computer for analysis and storage.
The calibration system mainly adopts cold and hot loads: scaling by a scheme of 'rotation sun, cold air, noise source and matched load', wherein a scaling system is controlled according to a conventional scaling method, as shown in FIGS. 11 and 12;
meanwhile, the ground-based solar radio telescope is provided with a transceiver II, and an X (8-9 GHz) wave band is used as a communication signal transceiving frequency band, so that the influence caused by solar radio outbreak is avoided, and the interference on a solar radio receiver part can be avoided; and when the abnormal flow of the monitoring energy section is found, early warning information is sent to a monitoring satellite and a navigation ground station of a high-energy ray detector system carried on the in-orbit satellite platform through the transceiver II.
Claims (2)
1. The utility model provides a system for early warning sun radio outbreak disturbs satellite communication based on air-ground allies oneself with surveys, its characterized in that: the high-energy ray detector system carried on the in-orbit satellite platform comprises a high-energy ray detector system, a land-based solar radio telescope and a computer, wherein the high-energy ray detector system carried on the in-orbit satellite platform comprises a high-energy ray detector, a signal processor and a transceiver I;
the ground-based solar radio telescope comprises a radio antenna, an analog receiver system, a calibration system, a transceiver II, more than 3 power-voltage converters and a data acquisition unit; the radio antenna is connected with the analog receiver system through the calibration system, the analog receiver system is connected with the data acquisition unit through the power-voltage converter, the data acquisition unit is connected with the computer, and the computer is connected with the calibration system; the transceiver II is respectively connected with the transceiver I, the radio antenna and the computer;
the analog receiver system comprises a first-stage amplifier, a power divider, more than 3 isolators, more than 3 filters I, more than 3 second-stage amplifiers and more than 3 filters II; the first-stage amplifier, the power divider, the isolator, the filter I, the second-stage amplifier and the filter II are sequentially connected, and the filter II is connected with the power-voltage converter;
the calibration system comprises a microwave switch and a noise source, wherein the noise source is connected with the microwave switch, and the radio antenna is connected with the analog receiver system through the microwave switch; the computer is connected with the microwave switch;
the ground-based solar radio telescope is communicated with a transceiver I of the aerial high-energy ray detector system through a transceiver II integrated with the ground-based solar radio telescope, and the communication frequency band is 8-9GHz in the X wave band.
2. The system for early warning of solar radio burst interference with satellite communication based on air-ground joint survey according to claim 1, wherein: and the filter I and the filter II are both band-pass filters.
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| CN107820311A (en) * | 2017-12-05 | 2018-03-20 | 中国科学院云南天文台 | For the quick early warning system of solar radio burst interference navigational communications event |
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