CN109672469A - Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum - Google Patents
Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum Download PDFInfo
- Publication number
- CN109672469A CN109672469A CN201811459457.3A CN201811459457A CN109672469A CN 109672469 A CN109672469 A CN 109672469A CN 201811459457 A CN201811459457 A CN 201811459457A CN 109672469 A CN109672469 A CN 109672469A
- Authority
- CN
- China
- Prior art keywords
- gso
- earth station
- ngso satellite
- ngso
- frequency spectrum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/195—Non-synchronous stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/19—Earth-synchronous stations
Abstract
The present invention discloses a kind of GSO and avoiding angle calculation method coexists in NGSO satellite frequency spectrum, comprising the following steps: Step 1: determining that the interference I for the NGSO satellite launch wave beam that GSO earth station receives and GSO earth station receive the threshold value η of the ratio between equivalent noise N of system0；Step 2: calculating the equivalent noise N that GSO earth station receives system；Step 3: interference the ratio between I and equivalent noise N are less than or equal to threshold value η0As the standard that GSO and NGSO satellite frequency spectrum coexist, to obtain the condition that interference I needs to meet, and then the condition that reception gain of the GSO earth station at avoiding angle needs to meet is determined；Step 4: finding the angle that reception gain meets above-mentioned condition on the antenna pattern of GSO earth-station receiving antenna, the as GSO satellite GSO earth station avoiding angle compatible with NGSO satellite frequency spectrum can calculate and meet the avoiding angle that GSO coexists with NGSO satellite frequency spectrum.
Description
Technical field
The invention belongs to the technical fields of satellite communication, and in particular to a kind of GSO (Geostationary-Satellite
Orbit, geostationary satellite orbit) with NGSO (Non-Geostationary Satellite Orbit, it is non-static over the ground to defend
Star orbital road) avoiding angle calculation method coexists in satellite frequency spectrum.
Background technique
With gradualling mature for the communication technology and intelligent mobile terminal, using multimedia communication as the new network of representative and
The appearance and explosive growth of new business, construction cover extensive, economical and practical internet, and it is economical to push to become countries in the world
The important infrastructure for increasing and constructing energetically.In face of so wide prospect, it is necessary to build space-based broadband connections system for China
System, the Incorporate information network collectively constituted with ground network system, further satisfaction user is to global seamless coverage
Broadband service and the mobile related needs ensured.
Space-based wide-band communication system can be divided into GSO and NGSO satellite communication system by the difference of orbit altitude.GSO satellite is logical
Letter system and NGSO satellite communication system have his own strong points and complement each other.Currently, it is external showed GSO satellite communication system and
NGSO satellite communication system joint runs the developing state to realize mutual supplement with each other's advantages.
Under the background that NGSO satellite and GSO satellite frequency spectrum share, conllinear interference may be a serious problem, especially
It is when NGSO satellite is in the earth station and GSO satellite links of GSO satellite, this is because being in GSO satellite and NGSO satellite
Earth station on extended line may be received or be generated interference by its main beam.Therefore, for the GSO of spectrum sharing and NGSO
Satellite system explores a kind of efficient technology to inhibit frequency interferences be to realize that the collaborative work of GSO and NGSO satellite must solve
Certainly and challenging problem.
Spacing isolation method is a kind of effective ways for realizing that GSO and NGSO satellite frequency spectrum is compatible.It is observed when from earth station
When the angle of the NGSO satellite and GSO satellite that arrive is less than specific avoiding angle, spacing isolation method passes through the portion for closing NGSO satellite
Partial wave beam avoids the GSO satellite system from being interfered.But it is disclosed currently without document and introduces spacing isolation method avoiding angle
Calculative strategy.
Summary of the invention
In view of this, the present invention provides a kind of GSO and NGSO satellite frequency spectrum, and avoiding angle calculation method coexists, can calculate
Meet the avoiding angle that GSO coexists with NGSO satellite frequency spectrum.
Realize that technical scheme is as follows:
Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum, comprising the following steps:
Step 1: determining that the interference I for the NGSO satellite launch wave beam that GSO earth station receives and GSO earth station receive system
The threshold value η of the ratio between the equivalent noise N of system0；
Step 2: calculating the equivalent noise N that GSO earth station receives system；
Step 3: interference the ratio between I and equivalent noise N are less than or equal to threshold value η0It is total as GSO and NGSO satellite frequency spectrum
The standard deposited to obtain the condition that interference I needs to meet, and then determines that reception gain of the GSO earth station at avoiding angle needs
The condition to be met；
Step 4: finding the angle that reception gain meets above-mentioned condition on the antenna pattern of GSO earth-station receiving antenna
Degree, as the GSO satellite GSO earth station avoiding angle compatible with NGSO satellite frequency spectrum.
Further, reception gain G of the GSO earth station at avoiding angler(α0) need the condition that meets are as follows:
Wherein, PtIt is NGSO satellite launch power, Gt-maxFor the maximum gain of NGSO satellite transmitting antenna；λ is electric wave wave
Long, R is NGSO satellite to NGSO earth Station Transmission Link operating distance, α0The rule coexisted for GSO satellite and NGSO satellite frequency spectrum
Keep away angle.
The utility model has the advantages that
1, the avoiding angle calculation method that a kind of GSO of the invention and NGSO satellite frequency spectrum coexist, clearly gives satisfaction
The GSO satellite earth station avoiding angle calculation method compatible with NGSO satellite frequency.
2, the avoiding angle calculation method that a kind of GSO of the invention and NGSO satellite frequency spectrum coexist, using based on earth station
Perspective Analysis determination meets the GSO satellite avoiding angle compatible with NGSO satellite frequency, is easy to the implementation of NGSO satellite system and evades plan
Slightly.
Detailed description of the invention
Fig. 1 is earth station angle of departure schematic diagram.
Fig. 2 is GSO earth-station receiving antenna antenna pattern.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention by GSO it is compatible with NGSO satellite down link frequency share for provide following technical proposals.
The frequency compatibling problem given for NGSO satellite transmitting antenna and GSO receiving antenna parameter, it is first determined GSO
The interference for the NGSO satellite launch wave beam that ball station receives receives the threshold value of the ratio between equivalent noise of system with GSO earth station；
Then, the equivalent noise that NGSO earth station receives system is calculated；Then, it is determined that reception gain of the GSO earth station at avoiding angle
The condition for needing to meet；Finally, determining avoiding angle according to the antenna pattern of above-mentioned condition and GSO earth-station receiving antenna.
Avoiding angle calculation method coexists in a kind of GSO provided by the invention and NGSO satellite frequency spectrum, comprising the following steps:
Step 1: determining that the interference I for the NGSO satellite launch wave beam that GSO earth station receives and GSO earth station receive system
The threshold value η of the ratio between the equivalent noise N of system0；
GSO satellite and NGSO satellite can frequency spectrum the NGSO satellite launch wave received with GSO earth station receiver coexists
The interference I and GSO earth station of beam receives the ratio between the equivalent noise N of system η to measure；
η=I/N (1)
Interference and the GSO earth of the NGSO satellite launch wave beam that GSO earth station receives are determined according to " radio regulation(s) "
The threshold value η of the ratio between the equivalent noise for reception system of standing0。
Step 2: calculating the equivalent noise N that GSO earth station receives system；
The equivalent noise of GSO earth station receiver can be expressed as
N=kTB (2)
Wherein, k is Boltzmann constant (unit, J/K), and T is reception system equivalent noise temperature (unit, K), and B is to connect
The reference bandwith (unit, Hz) of receipts system.
Step 3: utilizing threshold value η0, interference I and noise N determine GSO earth-station receiving antenna connecing at avoiding angle
Receive gain Gr(α0) need the condition that meets；
Under the background that GSO satellite and NGSO satellite frequency spectrum share, conllinear interference may be a serious problem, especially
It is when the subtended angle between observe from GSO earth station, GSO satellite and NGSO satellite is smaller.GSO earth station receiver receives
To the interference of NGSO satellite can be expressed as
Wherein, PtIt is NGSO satellite launch power；Gt(β) is NGSO satellite transmitting antenna gain, and β is transmitting deflecting angle；Gr
(α) is GSO earth-station receiving antenna gain, and α is to receive deflecting angle；λ is electric wave wavelength, and R is NGSO satellite to NGSO earth station
Transmission link operating distance.
Formula (3) is brought into formula (1) to obtain
The beam direction of NGSO satellite is directed toward NGSO earth station, in the case where other conditions are constant, when GSO earth station with
When NGSO earth station is in same position (as shown in Figure 1), the interference for the NGSO satellite that GSO earth station receiver receives is most
Greatly, so avoiding angle, which is isolated, with the space that location condition obtains with NGSO earth station using GSO earth station is necessarily suitable for the GSO earth
It stands and the scene of NGSO earth station difference location.
When GSO earth station and NGSO earth station are with location, transmitting deflecting angle β=0 ° in formula (4), thus formula (4)
In NGSO satellite transmitting antenna gain be NGSO satellite transmitting antenna maximum gain.Most by NGSO satellite transmitting antenna
Large gain is denoted as Gt-max, thus the NGSO satellite transmitting antenna gain G in formula (4)t(β)=Gt-max.By Gt(β)=Gt-maxBand
Enter formula (4) to obtain
NGSO satellite transmitting antenna beam direction is directed toward NGSO earth station, and GSO earth-station receiving antenna beam direction is directed toward
GSO satellite, and since the present invention program assumes GSO earth station and the same location of NGSO earth station, so observed from GSO earth station
Subtended angle between GSO satellite and NGSO satellite is the reception deflecting angle of GSO earth-station receiving antenna.GSO earth station is received
The ratio between the equivalent noise that the interference of the NGSO satellite launch wave beam arrived receives system with GSO earth station is less than or equal to threshold value η0It is right
The reception deflecting angle for the GSO earth-station receiving antenna answered is denoted as α0, thus
Angle [alpha]0As GSO satellite shared avoiding angle compatible with NGSO satellite frequency spectrum, arranges inequality (6),
GSO earth-station receiving antenna can be obtained in avoiding angle α0The reception gain G at placer(α0) it is necessary to meet following condition:
Step 4: finding the angle that reception gain meets above-mentioned condition on the antenna pattern of GSO earth-station receiving antenna
Degree, as the GSO satellite GSO earth station avoiding angle compatible with NGSO satellite frequency spectrum.
Embodiment
The definition of decibel (dB) is provided first, and decibel (dB) is the logarithm list for being widely used for indicating power ratio in electronics
Position, it is assumed that two power ratios are Kp, then the two power ratios KdLogarithm (dB) indicate are as follows: Kd=10log10Kp(dB), after
Decibel and conventional unit are used in the embodiment of text simultaneously.
The avoiding angle calculation method that a kind of GSO and NGSO satellite frequency spectrum of the invention coexists, GSO earth station receive system
Equivalent noise temperature is T=160K, and reference bandwith B=10MHz, Boltzmann constant is k=1.38 × 10-23J/K。NGSO
The maximum gain of satellite transmitting antenna is Gt-max=9.5dBi is P in the transmission power that reference bandwith is B=10MHzt=
6dBW, electric wave wavelength are λ=0.015m, and transmission link operating distance is R=1.2 × 106m。
Step 1: determining that the interference for the NGSO satellite launch wave beam that GSO earth station receives and GSO earth station receive system
The ratio between equivalent noise threshold value η0；
It is provided according to " radio regulation(s) ", for two GSO satellite systems of spectrum sharing, when disturbed system receives
The ratio between interference and the disturbed equivalent noise of interference system launching beam be no more than η0When=- 12.2dB, two GSO satellites
System does not need to be coordinated.Compatible share of frequency of the invention uses this standard, when the NGSO satellite that GSO earth station receives
The ratio between the equivalent noise that the interference of launching beam receives system with GSO earth station is no more than η0When=- 12.2dB, it is believed that Ke Yishi
Existing NGSO satellite system is compatible with GSO satellite system frequencies.
Step 2: calculating the equivalent noise N that GSO earth station receives system；
The equivalent noise temperature that GSO earth station receives system is T=160K, reference bandwith B=10MHz, Boltzmann
Constant is k=1.38 × 10-23J/K brings the above parameter into formula (2), can calculate equivalent the making an uproar of GSO earth station receiver
Sound is
N=2.21 × 10-14W=-136.56dBW
Step 3: determining the condition that reception gain of the GSO earth station at avoiding angle needs to meet
The maximum gain of NGSO satellite transmitting antenna is Gt-max=9.5dBi, in the transmitting function that reference bandwith is B=10MHz
Rate is Pt=6dBW, electric wave wavelength are λ=0.015m, and transmission link operating distance is R=1.2 × 106m；GSO earth station receives
The equivalent noise of machine is N=-136.56dBW, the interference for the NGSO satellite launch wave beam that GSO earth station receives and the GSO earth
The threshold value η of the ratio between the equivalent noise for reception system of standing0=-12.2dB brings the above parameter into formula (7), can calculate GSO
Earth station is in avoiding angle α0The reception gain G at placer(α0) need to meet condition are as follows:
Gr(α0)≤15.8dBi
Step 4: finding reception gain G on the antenna pattern of GSO earth-station receiving antennar(α) meets formula (7)
Angle, the as GSO satellite GSO earth station avoiding angle compatible with NGSO satellite frequency spectrum.
The reference diameter of GSO earth-station receiving antenna is taken as 30cm, and reception gain uses " radio regulation(s) " ITU-R
S.465-6 antenna pattern determines, for directional diagram as shown in Fig. 2, when then deflecting angle is 4.5 °, gain amplifier is that 15.7dBi (is less than
15.8dBi).So in order to meet frequency compatibility requirements, avoiding angle is taken as 4.5 °.
Claims (2)
1. avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum, which comprises the following steps:
Step 1: determining that the interference I for the NGSO satellite launch wave beam that GSO earth station receives and GSO earth station receive system
The threshold value η of the ratio between equivalent noise N0；
Step 2: calculating the equivalent noise N that GSO earth station receives system；
Step 3: interference the ratio between I and equivalent noise N are less than or equal to threshold value η0The mark coexisted as GSO and NGSO satellite frequency spectrum
Standard to obtain the condition that interference I needs to meet, and then determines that reception gain of the GSO earth station at avoiding angle needs to meet
Condition；
Step 4: finding the angle that reception gain meets above-mentioned condition on the antenna pattern of GSO earth-station receiving antenna, i.e.,
For the GSO satellite GSO earth station avoiding angle compatible with NGSO satellite frequency spectrum.
2. avoiding angle calculation method coexists in a kind of GSO as described in claim 1 and NGSO satellite frequency spectrum, which is characterized in that GSO
Reception gain G of the earth station at avoiding angler(α0) need the condition that meets are as follows:
Wherein, PtIt is NGSO satellite launch power, Gt-maxFor the maximum gain of NGSO satellite transmitting antenna；λ is electric wave wavelength, R
It is NGSO satellite to NGSO earth Station Transmission Link operating distance, α0The avoiding angle coexisted for GSO satellite and NGSO satellite frequency spectrum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811459457.3A CN109672469A (en) | 2018-11-30 | 2018-11-30 | Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811459457.3A CN109672469A (en) | 2018-11-30 | 2018-11-30 | Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109672469A true CN109672469A (en) | 2019-04-23 |
Family
ID=66143499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811459457.3A Pending CN109672469A (en) | 2018-11-30 | 2018-11-30 | Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109672469A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224741A (en) * | 2019-06-06 | 2019-09-10 | 航天科工空间工程发展有限公司 | NGSO satellite constellation and GSO satellite communication system frequency spectrum coexistence method |
| CN110708110A (en) * | 2019-10-09 | 2020-01-17 | 北京中科晶上科技股份有限公司 | Method for avoiding uplink interference of nonsynchronous orbit satellite on synchronous orbit satellite |
| CN110838866A (en) * | 2019-10-09 | 2020-02-25 | 中国空间技术研究院 | Method for sharing same frequency of NGSO satellite system and GSO satellite system |
| CN110958047A (en) * | 2019-10-12 | 2020-04-03 | 中国空间技术研究院 | Low-orbit constellation GEO frequency interference avoidance method based on multiple coverage |
| CN111934739A (en) * | 2020-07-02 | 2020-11-13 | 航天科工空间工程发展有限公司 | Interference avoidance method for reducing pitching angle of NGSO satellite |
| CN113131988A (en) * | 2021-03-03 | 2021-07-16 | 中国科学院国家空间科学中心 | Multi-dimensional GSO satellite system compatibility analysis method |
| CN114422057A (en) * | 2022-01-10 | 2022-04-29 | 国家无线电监测中心陕西监测站 | Simple and convenient calculation method for global large-scale deployment of IMT base station to satellite lumped interference |
| CN114630362A (en) * | 2022-03-16 | 2022-06-14 | 军事科学院系统工程研究院网络信息研究所 | Method for calculating support degree of space spectrum resources to satellite communication system downlink |
| CN114900223A (en) * | 2022-04-11 | 2022-08-12 | 中国科学院国家空间科学中心 | Inter-satellite communication link interference avoidance method based on disturbed link included angle |
| CN114422057B (en) * | 2022-01-10 | 2024-05-10 | 国家无线电监测中心陕西监测站 | Simple calculation method for global large-scale deployment of IMT base station to satellite lumped interference |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030034422A1 (en) * | 2000-01-07 | 2003-02-20 | The Boeing Company | Method for limiting interference between satellite communications systems |
| CN105744531A (en) * | 2016-02-04 | 2016-07-06 | 中国空间技术研究院 | Inline interference suppression based geostationary orbit (GEO) and non-geostationary orbit (NGEO) communication satellite spectrum sharing method |
| US20160278064A1 (en) * | 2015-03-20 | 2016-09-22 | Qualcomm Incorporated | Epfd coverage for ngso satellites |
| CN107980210A (en) * | 2017-02-17 | 2018-05-01 | 清华大学 | A kind of satellite constellation implementation method for implementing communication using regression orbit |
| CN108712202A (en) * | 2018-05-16 | 2018-10-26 | 清华大学 | Evade the method and satellite communication system of co-channel interference by deflecting antenna direction |
-
2018
- 2018-11-30 CN CN201811459457.3A patent/CN109672469A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030034422A1 (en) * | 2000-01-07 | 2003-02-20 | The Boeing Company | Method for limiting interference between satellite communications systems |
| US20160278064A1 (en) * | 2015-03-20 | 2016-09-22 | Qualcomm Incorporated | Epfd coverage for ngso satellites |
| CN105744531A (en) * | 2016-02-04 | 2016-07-06 | 中国空间技术研究院 | Inline interference suppression based geostationary orbit (GEO) and non-geostationary orbit (NGEO) communication satellite spectrum sharing method |
| CN107980210A (en) * | 2017-02-17 | 2018-05-01 | 清华大学 | A kind of satellite constellation implementation method for implementing communication using regression orbit |
| CN108712202A (en) * | 2018-05-16 | 2018-10-26 | 清华大学 | Evade the method and satellite communication system of co-channel interference by deflecting antenna direction |
Non-Patent Citations (1)
| Title |
|---|
| 靳瑾，等: "全球动态场景下非静止轨道通信星座干扰发生概率和系统可用性", 《清华大学学报(自然科学版)》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224741A (en) * | 2019-06-06 | 2019-09-10 | 航天科工空间工程发展有限公司 | NGSO satellite constellation and GSO satellite communication system frequency spectrum coexistence method |
| CN110708110B (en) * | 2019-10-09 | 2022-08-09 | 北京中科晶上科技股份有限公司 | Method for avoiding uplink interference of nonsynchronous orbit satellite on synchronous orbit satellite |
| CN110708110A (en) * | 2019-10-09 | 2020-01-17 | 北京中科晶上科技股份有限公司 | Method for avoiding uplink interference of nonsynchronous orbit satellite on synchronous orbit satellite |
| CN110838866A (en) * | 2019-10-09 | 2020-02-25 | 中国空间技术研究院 | Method for sharing same frequency of NGSO satellite system and GSO satellite system |
| CN110958047A (en) * | 2019-10-12 | 2020-04-03 | 中国空间技术研究院 | Low-orbit constellation GEO frequency interference avoidance method based on multiple coverage |
| CN111934739A (en) * | 2020-07-02 | 2020-11-13 | 航天科工空间工程发展有限公司 | Interference avoidance method for reducing pitching angle of NGSO satellite |
| CN113131988A (en) * | 2021-03-03 | 2021-07-16 | 中国科学院国家空间科学中心 | Multi-dimensional GSO satellite system compatibility analysis method |
| CN114422057A (en) * | 2022-01-10 | 2022-04-29 | 国家无线电监测中心陕西监测站 | Simple and convenient calculation method for global large-scale deployment of IMT base station to satellite lumped interference |
| CN114422057B (en) * | 2022-01-10 | 2024-05-10 | 国家无线电监测中心陕西监测站 | Simple calculation method for global large-scale deployment of IMT base station to satellite lumped interference |
| CN114630362A (en) * | 2022-03-16 | 2022-06-14 | 军事科学院系统工程研究院网络信息研究所 | Method for calculating support degree of space spectrum resources to satellite communication system downlink |
| CN114630362B (en) * | 2022-03-16 | 2022-10-21 | 军事科学院系统工程研究院网络信息研究所 | Method for calculating support degree of space spectrum resources to satellite communication system downlink |
| CN114900223A (en) * | 2022-04-11 | 2022-08-12 | 中国科学院国家空间科学中心 | Inter-satellite communication link interference avoidance method based on disturbed link included angle |
| CN114900223B (en) * | 2022-04-11 | 2023-12-22 | 中国科学院国家空间科学中心 | Inter-satellite communication link interference avoidance method based on interfered link included angle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109672469A (en) | Avoiding angle calculation method coexists in a kind of GSO and NGSO satellite frequency spectrum | |
| CN107018514B (en) | Spectrum sharing between aircraft-based air-to-ground communication systems and existing geostationary satellite services | |
| RU2153226C2 (en) | Device for controlling distributed signal transmission system using satellite retransmitters | |
| US20150078218A1 (en) | Providing different transmit and/or receive modes in different sectors of a wireless base station | |
| CN107070526A (en) | Low rail satellite smart antennas reception system and method | |
| US20130044677A1 (en) | Telecommunications System Comprising an Airborne Communication Node, Airborne Communication Node and Tactical Radio Node | |
| Khaleefa et al. | Tethered balloon technology for telecommunication, coverage and path loss | |
| CN110753354B (en) | Unmanned aerial vehicle cooperation satellite-ground combined NOMA communication system based position deployment method | |
| CN108173589A (en) | A kind of moonlet TT＆C system and method suitable for survey of deep space | |
| US20220407590A1 (en) | Systems and methods for communicating data over satellites | |
| Tani et al. | An adaptive beam control technique for diversity gain maximization in LEO satellite to ground transmissions | |
| CN107395299B (en) | Interference analysis method for 450MHz frequency band satellite meteorological service and railway train dispatching system | |
| CN108173591B (en) | Cognitive troposphere scattering communication system and method and wireless communication system | |
| CN112584308A (en) | Unmanned aerial vehicle cluster over-the-horizon networking device and method based on Beidou system | |
| CN108880657B (en) | Frequency conversion forwarding device based on technology detection technology in air-based relay communication enhancement system | |
| CN115412145B (en) | On-orbit processing and multichannel transmission system for infrared remote sensing data | |
| Umehira | Feasibility of frequency sharing in satellite/terrestrial integrated mobile communication systems | |
| CN201226518Y (en) | Frequency shift companding relay station and relay device | |
| Abdulrazak et al. | Study HAPS interference power to noise level ratio of fixed services and related separation distance | |
| CN212305395U (en) | Device for amplifying and repeating L-band satellite telephone signal | |
| CN110224739A (en) | A kind of LEO Satellite communication link frequency interferences judgment method | |
| CN207677725U (en) | Cloud relay communications system | |
| CN110456307A (en) | A kind of method of locating terminal based on indoor Pseudolite signal carrier-to-noise ratio | |
| Reis et al. | An overview of the alfa crux cubesat mission for narrowband communication | |
| CN107919899A (en) | Cloud relay communications system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190423 |