CN101098183B - System for monitoring ionosphere scintillation and interference - Google Patents
System for monitoring ionosphere scintillation and interference Download PDFInfo
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- CN101098183B CN101098183B CN2006100895375A CN200610089537A CN101098183B CN 101098183 B CN101098183 B CN 101098183B CN 2006100895375 A CN2006100895375 A CN 2006100895375A CN 200610089537 A CN200610089537 A CN 200610089537A CN 101098183 B CN101098183 B CN 101098183B
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Abstract
The invention discloses a system for detecting the flash and interference of ionization layer, comprising an antenna, a low-noise amplifier, a cable, and a frequency spectrograph, wherein the antenna is electrically connected with the amplifier connected with the frequency spectrograph via the cable. The invention has the advantages that the invention can process anti-interference alarm as well as detect the weak and strong flash of frequency spectrograph, receive the signal of satellite around earth track, and receive static satellite signal.
Description
Technical field
The present invention relates to satellite communication field, the system of particularly a kind of monitoring ionosphere scintillation and interference.
Background technology
When satellite transmitted electric wave signal earthward, the irregular structure in the ionosphere can cause the fluctuating of satellite electric wave signal intensity, and this phenomenon is called as flicker.The ionospheric scintillation meeting produces serious influence to the performance of space-based satellite communication and navigation system, even causes the inefficacy of related system.Navigation system receiver that ionospheric scintillation causes week jumps or the carrier phase losing lock, for high accuracy navigator fix real time differential, satellite-based navigation, high-precision fixed to etc. system can produce disastrous influence.
Near magnetic equator low latitude zone, the ionosphere irregular structure that is formed by the plasma bubble can cause floating more than the microwave band signal amplitude 10dB.In the territory, equatorial region, though low latitude district is serious, irregular structure also usually makes the image deterioration of communication, data satellite, and the week that ionospheric scintillation causes jumps also very frequent; When geomagnetic storm took place, strong flicker also caused the radio wave propagation serious hindrance in middle latitude area.Many countries comprise that more than half territory of China all is arranged in the low district of magnetic latitude, guarantee the reliability of hi-Fix orientation system, guarantee the quality of satellite communication, and flicker is an inevitable problem.Flicker causes the seizure difficulty of satellite electric wave signal, and this is great harm for satellite communication and satellite navigation location.
In the prior art, generally adopt frequency conversion or superheterodyne receiver observation ionospheric scintillation phenomenon, these receivers mainly are made up of several parts such as antenna, radio frequency, intermediate frequency and base band, and there is following defective in it aspect the stable observation signal strength signal intensity:
(a), the antenna aspect, traditional receiver uses omnidirectional antenna, in the deflection of 120 degree, differs 3dB between the gain maximum of antenna and the minimum value, in the time of beyond gps satellite turns to 120 degree, antenna also may receive signal.Because the receive direction of omnidirectional antenna can be had nothing in common with each other, and the variation that the antenna receive direction brings can produce the variation that receives signal amplitude, and signal amplitude changes the error of being brought and is difficult for eliminating and revising.In addition, the multipath effect that causes of the reflection of building, trees blocks amplitude and phase places to received signal such as decay and also can produce very large influence.
(b), the automatic gain control of the intermediate frequency of traditional receiver produces adjusting automatically to direct signal intensity, and signal is remained unchanged to the level of base band input basically, and noise was exaggerated with signal or reduced this moment.Because receiver can calculate the situation that noise is recently predicted the spacing wave decay originally, but the control of the automatic gain of intermediate frequency is big or small receiver noise is exerted an influence, therefore introduced the error that signal to noise ratio produces with automatic gain control.
(c), the base band of traditional receiver carries out despreading to signal, also can produce error.
In addition, also there is following shortcoming usually in existing receiver:
1, receiver has the hardware errors such as change of related gain, and this makes the seizure difficulty of satellite electric wave signal that satellite constellation, strong flicker etc. is caused, even can make the interruption that receives signal.For example, utilize ordinary GPS receiver observation ionospheric scintillation, the intensity of the CDMA spread-spectrum signal sign indicating number (PRN) of gps satellite extremely a little less than, be submerged in the noise, can't observe radio-frequency carrier.
2, can't carry out early warning to the artificial disturbance of satellite.Artificial disturbance is a conventional means of destroying navigation positioning satellite, early warning is carried out in artificial disturbance had very big using value.
Summary of the invention
The objective of the invention is to overcome existing satellite signal receiver can not accept satellite-signal under the situation of the strong flicker in ionosphere, and in the time accepting satellite-signal, has the defective than mistake again.
To achieve these goals, the present invention provides the system of a kind of monitoring ionosphere scintillation and interference, comprises antenna 1, low noise amplifier 2, cable 3, also comprises frequency spectrograph 5; Wherein, described antenna 1 is electrically connected with described low noise amplifier 2, and described low noise amplifier 2 is connected on the frequency spectrograph 5 through cable 3.
In the technique scheme, described antenna 1 is a parabolic antenna.
In the technique scheme, also comprise band pass filter 4, signal trace and transacter 6, antenna servo system 7 and relay amplifier 8; Wherein, Described antenna 1 is electrically connected with described low noise amplifier 2 with described antenna servo system 7 respectively; Described low noise amplifier 2 is electrically connected with described relay amplifier 8 through described cable 3; 8 of described relay amplifiers are electrically connected on the described band pass filter 4 through described cable 3; Described band pass filter 4 is electrically connected with said frequency spectrograph 5, and said frequency spectrograph 5 is electrically connected on described signal trace and the transacter 6, and described signal trace also is electrically connected with described antenna servo system 7 with transacter 6.
Described antenna 1 is a parabolic antenna.
Described antenna servo system 7 is a kind of mechanical rotation devices that are used to regulate the rotation direction of said antenna 1, and it is installed on the described antenna 1.
The intensity of described signal trace and transacter 6 tracer signals, and send instruction to described antenna servo system 7 according to the orbit information of satellite.
The invention has the advantages that:
1, the present invention adopts parabolic antenna, when having avoided omnidirectional antenna to receive signal, and the error that signal amplitude, phase change are brought.
2, the present invention does not adopt the automatic gain control of intermediate frequency, has avoided the error of bringing thus.
3, the present invention does not use Base-Band Processing, does not exist base band signal to be carried out despreading and the error that produces.
4, the present invention also can carry out anti-interference early warning when ionospheric scintillation is monitored; In conjunction with flicker Measurement and analysis and noise characteristic; Can distinguish artificial disturbance or spontaneous ionization layer physical event, a kind of reliable means and foundation are provided for taking interference protection measure.
5, the present invention not only can monitor ionospheric weak flicker, and also can monitor for ionospheric strong flicker.
6, the present invention is not only applicable to the reception around the earth-orbiting satellite signal, is applicable to the reception of geostationary orbit satellite signal yet.
Description of drawings
Fig. 1 is the structure chart of an embodiment of the system of monitoring ionosphere scintillation of the present invention and interference;
Fig. 2 is the structure chart of another embodiment of the system of monitoring ionosphere scintillation of the present invention and interference;
Fig. 3 is signal and the comparison diagram of noise level of the system of existing GPS navigation positioning satellite receiver and monitoring ionosphere scintillation of the present invention and interference.
The drawing explanation
1 parabolic antenna, 2 low noise amplifiers, 3 cables, 4 band pass filters
5 frequency spectrographs, 6 signal trace and transacter 7 antenna servo systems
8 relay amplifiers
Embodiment
Below in conjunction with accompanying drawing and embodiment device of the present invention is described.
Fig. 1 is an embodiment of the system of monitoring ionosphere scintillation of the present invention and interference, and in this embodiment, system of the present invention is made up of parabolic antenna 1, low noise amplifier 2, cable 3 and frequency spectrograph 5.
Described parabolic antenna 1 is used to receive the signal of satellite; With the employed omni-directional antennas of traditional receiver; The gain of described parabolic antenna 1 can be up to tens decibels; Its antenna directional angle is minimum, for example can accomplish less than 1 degree, has avoided the variation of the reception signal amplitude that omnidirectional antenna produces owing to the variation of antenna receive direction.
Described low noise amplifier 2 is used for the loss of compensating signal when cable is made the length Distance Transmission.Because the distance that signal inspection process end instrument is set a little of outdoor parabolic antenna 1 is very long usually, so need in device, add described low noise amplifier 2, with the loss of compensating signal in transmission course.
Described cable 3 is used to transmit signal.
Described frequency spectrograph 5 is used for the carrier signal of observation satellite.
Fig. 2 is an alternative embodiment of the invention; In this embodiment, device of the present invention is made up of parabolic antenna 1, low noise amplifier 2, cable 3, band pass filter 4, frequency spectrograph 5, signal trace and transacter 6, antenna servo system 7 and relay amplifier 8.Parabolic antenna 1 is connected with low noise amplifier 2 with antenna servo system 7 respectively; Described low noise amplifier 2 is connected with relay amplifier 8 through cable 3; 8 of described relay amplifiers are connected on the band pass filter 4 through cable 3; Band pass filter 4 is electrically connected with frequency spectrograph 5, and frequency spectrograph 5 is electrically connected on signal trace and the transacter 6, and signal trace also is electrically connected with antenna servo system 7 with transacter 6.
Described low noise amplifier 2 is used for the loss of compensating signal when cable is made the length Distance Transmission.
Described cable 3 is used to transmit the signal that receives from satellite.
Described frequency spectrograph 5 is used for the signal of observation satellite.
Described band pass filter 4 is used to reduce the interference of extraneous various frequency band signals clutters, can adopt the band pass filter of gps satellite L1 frequency range 1575MHz ± 15MHz in the present embodiment.
Described signal trace and transacter 6 are used to write down the intensity of satellite carrier signal, and in addition, the staff can send instruction, the rotation of control antenna servo system 7 to antenna servo system 7 through signal trace and transacter 6.Described signal trace and transacter 6 can be by the computer realization that corresponding software is installed.In the present invention, described signal trace is exactly the tracking to satellite, for nonstationary satellite; They all have specific track; Follow corresponding law in the mechanics, after supervision department obtains orbit information via satellite, orbit information is imported in described signal trace and the data acquisition unit 6; Signal trace and transacter 6 send control command according to orbit information to antenna servo system 7, to realize the tracking to satellite.Collection to satellite data also can realize through an integrated circuit board.
Described antenna servo system 7 is used to control the rotation of parabolic antenna 1, and described antenna servo system 7 is actually a kind of mechanical rotation device, and described parabolic antenna 1 is installed on the antenna servo system 7, rotates along with the rotation of antenna servo system 7.After antenna servo system 7 received control command from signal trace and transacter 6, the elevation angle, azimuth that change antenna 1 were to reach the purpose of tracking satellite.
Described relay amplifier 8 is similar with the effect of described low noise amplifier 2, is used for compensating signal loss when cable is made the length Distance Transmission.
When work, parabolic antenna 1 receives the signal that satellite sends, and sends signal to then in low noise amplifier 2 and the relay amplifier 8 and amplifies; Signal after the amplification is sent in the band pass filter 4 through cable 3; The extraneous clutter that is mingled with in the filtered signal, signal are sent to behind filtering operation in the frequency spectrograph 5, the waveform of frequency spectrograph 5 shows signal; Filtered signal also is sent in signal trace and the transacter 6, and this device can get off the data record such as intensity of signal.Through described signal trace and data acquisition unit 6, also may command antenna servo system 7 utilizes antenna servo system 7 to regulate the antenna receive direction of parabolic antenna 1.
As shown in Figure 3, the left-half S1 in Fig. 3 has shown that existing GPS navigation positioning satellite receiver receives the situation of signal.When this receiver adopts the omnidirectional antenna receiving satellite signal; The signal level value L1 that is received-below the 220dBW/Hz, and thermal noise level L2 is under-204dBW/Hz, noise level is higher than the level of satellite-signal; Therefore in this receiver, can't directly observe with frequency spectrograph to signal.
In the system of monitoring ionosphere scintillation of the present invention and interference, can use frequency spectrograph directly the signal of satellite to be followed the tracks of, observed and analyzes.In the system implementation example of a monitoring ionosphere scintillation and interference; Select the parabolic antenna of a 37dB for use; Consider the decay of cable and filter to signal; In system, connect a low noise amplifier (LNA) and the relay amplifier more than the 40dB, be used to amplify satellite-signal, the level value of the signal after the amplification is L4.Because low noise amplifier also can amplify noise in amplifying signal, the noise basis floors after therefore amplifying is L3.The level value L4 of the satellite-signal after the amplification is higher than the about 21dB of noise basis floors L3, and is higher than the floors threshold value L6 that makes an uproar of frequency spectrograph, therefore can directly observe the satellite-signal that maximum exceeds the about 21dB of noise basis floors L3 with frequency spectrograph.
Under normal circumstances, for example the influence change of amplitude is very little to the influence of signal in ionosphere, and regular.When ionospheric scintillation took place, ionosphere changed acutely the intensity of satellite-signal up and down.When strong flicker took place in ionosphere, the intensity of satellite-signal had surpassed traditional receiver threshold sometimes, and this moment, losing lock can take place receiver, can not observation signal, and can not utilize signal to study the mechanism that the ionosphere irregular structure forms.And traditional receiver losing lock phenomenon can not take place in device of the present invention, can receive and write down the change conditions of carrier signal in real time, and the intensity of noting satellite-signal changes violent situation of change up and down, and then the ionospheric scintillation incident that takes place is analyzed.In addition, satellite receives artificial disturbance easily in running.The effective means that satellite is disturbed is to disturb in the face of the uplink of satellite over the ground, especially using the signal that is higher than more than the carrier signal 10dB to carry out influence of jamming on the carrier wave frequency range, makes whole satellite system at a standstill.Utilize system of the present invention can realize early warning to artificial disturbance.Because when carrier-in-interference, carrier signal can keep high level singularly, and this signal when glimmering by force is obviously different to the dancing that amplitude reduces direction, on frequency spectrograph, can observe out intuitively.The technical staff can further take jamproof antagonism measure in view of the above.
Claims (2)
1. the system of monitoring ionosphere scintillation and interference comprises that one is used for antenna (1), low noise amplifier (2) and the cable (3) of receiving satellite signal; It is characterized in that, also comprise frequency spectrograph (5), band pass filter (4), signal trace and transacter (6), antenna servo system (7) and relay amplifier (8); Wherein, Described antenna (1) is electrically connected with described antenna servo system (7) and described low noise amplifier (2) respectively; Described low noise amplifier (2) is electrically connected with described relay amplifier (8) through described cable (3), and described relay amplifier (8) then is electrically connected on the described band pass filter (4) through described cable (3), and described band pass filter (4) is electrically connected with said frequency spectrograph (5); Described antenna (1) receives the signal that satellite sends; Send signal to then in low noise amplifier (2) and the relay amplifier (8) and amplify, the signal after the amplification is sent in the band pass filter (4) through cable (3), the extraneous clutter that is mingled with in the filtered signal; Signal is sent to behind filtering operation in the frequency spectrograph (5); The waveform of described frequency spectrograph (5) shows signal, said frequency spectrograph (5) are electrically connected on described signal trace and the transacter (6), and described signal trace and transacter (6) are used for the intensity of tracer signal; And send instruction to described antenna servo system (7) according to the orbit information of satellite, control the rotation of described antenna servo system (7); This antenna servo system (7) is used to control the rotation of parabolic antenna (1), and after antenna servo system (7) received control command from signal trace and transacter (6), the elevation angle, azimuth that change described antenna (1) were to reach the purpose of tracking satellite;
Wherein, described low noise amplifier (2) is the above low noise amplifier of a 40dB;
Described relay amplifier (8) is the above relay amplifier of a 40dB;
Described antenna (1) is the parabolic antenna of a 37dB.
2. the system of monitoring ionosphere scintillation according to claim 1 and interference is characterized in that, described antenna servo system (7) is a kind of mechanical rotation device that is used to regulate the rotation direction of said antenna (1), and it is installed on the described antenna (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100895375A CN101098183B (en) | 2006-06-30 | 2006-06-30 | System for monitoring ionosphere scintillation and interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100895375A CN101098183B (en) | 2006-06-30 | 2006-06-30 | System for monitoring ionosphere scintillation and interference |
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| Publication Number | Publication Date |
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| CN101098183A CN101098183A (en) | 2008-01-02 |
| CN101098183B true CN101098183B (en) | 2012-04-25 |
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| CN2006100895375A Expired - Fee Related CN101098183B (en) | 2006-06-30 | 2006-06-30 | System for monitoring ionosphere scintillation and interference |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111413716A (en) * | 2020-03-30 | 2020-07-14 | 中国科学院地质与地球物理研究所 | Monitoring system and monitoring method |
| CN111830596B (en) * | 2020-07-30 | 2021-12-03 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Prediction method for single-station UHF frequency band ionosphere scintillation event occurrence duration within half an hour in future |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126407A (en) * | 1994-10-27 | 1996-07-10 | 黄金富 | Decoder for satellite television |
| CN1625078A (en) * | 2000-07-26 | 2005-06-08 | 艾利森公司 | Mobile satellite communications system using multiple earth stations |
| CN200969586Y (en) * | 2006-06-30 | 2007-10-31 | 中国科学院空间科学与应用研究中心 | Device for monitoring ionosphere scintillation and electromagnetic interference |
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2006
- 2006-06-30 CN CN2006100895375A patent/CN101098183B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126407A (en) * | 1994-10-27 | 1996-07-10 | 黄金富 | Decoder for satellite television |
| CN1625078A (en) * | 2000-07-26 | 2005-06-08 | 艾利森公司 | Mobile satellite communications system using multiple earth stations |
| CN200969586Y (en) * | 2006-06-30 | 2007-10-31 | 中国科学院空间科学与应用研究中心 | Device for monitoring ionosphere scintillation and electromagnetic interference |
Non-Patent Citations (4)
| Title |
|---|
| 杨尧生等.卫星数字电视接收站的工程设计、调测和系统性能评估（1）.有线电视技术 2003年第4期（总124期）.2003,(2003年第4期（总124期）),45-50. |
| 杨尧生等.卫星数字电视接收站的工程设计、调测和系统性能评估(1).有线电视技术 2003年第4期(总124期).2003,(2003年第4期(总124期)),45-50. * |
| 韩金林.电子学在天文研究中的一些应用.电气电子教学学报24 5.2002,24(5),1-4. |
| 韩金林.电子学在天文研究中的一些应用.电气电子教学学报24 5.2002,24(5),1-4. * |
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