CN114531727A - Dynamic reconfigurable satellite-ground low-power-consumption communication technology based on LoRa (Low Range architecture) system - Google Patents
Dynamic reconfigurable satellite-ground low-power-consumption communication technology based on LoRa (Low Range architecture) system Download PDFInfo
- Publication number
- CN114531727A CN114531727A CN202210194990.1A CN202210194990A CN114531727A CN 114531727 A CN114531727 A CN 114531727A CN 202210194990 A CN202210194990 A CN 202210194990A CN 114531727 A CN114531727 A CN 114531727A
- Authority
- CN
- China
- Prior art keywords
- ground
- satellite
- low
- communication
- lora
- 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.)
- Granted
Links
- 230000006854 communication Effects 0.000 title claims abstract description 88
- 238000004891 communication Methods 0.000 title claims abstract description 87
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 claims description 8
- 108010003272 Hyaluronate lyase Proteins 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
-
- 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
- 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
- H04B7/18517—Transmission equipment in earth 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
- H04B7/18519—Operations control, administration or maintenance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a dynamic reconfigurable satellite-ground low-power-consumption communication technology based on a LoRa system, which comprises ground wearable equipment and a low-orbit micro-nano satellite receiver, wherein the ground wearable equipment calculates optimal communication parameters according to the current satellite orbit and the geographic position of the ground wearable equipment to realize dynamic reconfiguration of the communication parameters, and the flow of the dynamic reconfiguration of the communication parameters is as follows: calculating the instantaneous satellite-to-ground communication elevation angle, calculating the instantaneous satellite-to-ground communication distance, calculating the satellite-to-ground link margin, selecting and configuring the optimal communication parameters and transmitting data messages. According to the dynamic reconfigurable satellite-ground low-power-consumption communication technology based on the LoRa system, the communication parameters are adjusted by the orbit of the low-orbit micro-nano satellite, and the influence of the communication distance on the link can be dynamically compensated.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a dynamic reconfigurable satellite-ground low-power-consumption communication technology based on an LoRa (Low Range architecture) system.
Background
LoRa is a communication technology adopting linear frequency modulation spread spectrum, has stronger resistance to multipath fading under low transmitting power, has strong Doppler shift resistance in mobile communication, gives consideration to the characteristics of low complexity and low power consumption, supports a rate self-adaptive mechanism, and allows a terminal to adjust the communication rate according to the actual network deployment condition.
Currently, the LoRa system has been applied to constructing a communication link between a ground-based wearable device and a low-earth satellite. In order to ensure the stability of a communication link, the existing ground wearable device realizes satellite-ground communication by selecting an LoRa module with 1W of transmission power, selects a UHF frequency band, has a spreading factor of 8, and has a bandwidth of 125 Khz. In addition, the reliability of the satellite-ground link is further improved by adding an external antenna and periodically transmitting data. The low-orbit micro-nano satellite communicated with the low-orbit micro-nano satellite adopts a UHF frequency band and a four-arm helical antenna, the antenna is right-handed circularly polarized, the standing-wave ratio is less than 1.5, and the impedance is 50 ohms. In addition, the LoRa signal receiver on the low-orbit satellite selects the LoRa module which is the same as the ground wearable device. Because the communication link adopts fixed communication parameter configuration, the communication link cannot carry out real-time parameter adjustment according to the satellite orbit, lacks flexibility, and can ensure the continuous stability of the link only by high-power transmitting signals.
The power of a transmission signal needs to be improved in the current communication technology, and as the wearable device is small in size and cannot provide a large-capacity energy source, the continuous working time of the wearable device is further reduced along with the improvement of the transmission power;
communication parameters used by the existing communication link cannot be adaptively adjusted in real time according to a satellite orbit, when an elevation angle between a low-orbit micro-nano satellite and ground wearable equipment is low, the communication distance is increased, the robustness of the communication link is further reduced, and therefore a dynamic reconfigurable satellite-ground low-power-consumption communication technology based on a LoRa system is provided.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a dynamic reconfigurable satellite-ground low-power-consumption communication technology based on an LoRa (Long Range architecture) system, and solves the problems in the background technology.
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a low-power consumption communication technology of dynamic restructural star ground based on loRa system, includes that ground wearable equipment and low orbit receive the satellite a little, ground wearable equipment calculates best communication parameter according to current satellite orbit and the geographical position of ground wearable equipment, realizes communication parameter's dynamic reconfiguration, and communication parameter dynamic reconfiguration's flow is as follows: calculating the instantaneous satellite-ground communication elevation angle, calculating the instantaneous satellite-ground communication distance, calculating the satellite-ground link margin, selecting and configuring the optimal communication parameters and transmitting data messages.
Optionally, the computing instantaneous satellite-ground communication elevation angle: the ground wearable equipment is internally provided with a Beidou module, the Beidou satellite can be used for self-positioning, the orbit information of the low-orbit micro-nano satellite can be calculated in advance and injected into the ground wearable equipment, the information can be updated once per week, and the elevation angle gamma can be calculated by combining the orbit information of the self-position of the equipment and the orbit information of the satellite.
Optionally, the calculating the instantaneous satellite-to-ground communication distance: from the geometric knowledge, the relationship between the elevation angle β and the geocentric angle α is:
wherein R is the radius of the earth, and H is the height of the satellite from the ground;
from the cosine theorem, it can be known that:
and L is the satellite-ground communication distance, and the satellite-ground communication distance can be calculated by calculating the one-dimensional quadratic equation.
Optionally, the calculating the satellite-to-ground link margin: the spatial propagation loss is: the Ls is 32.44+20lgf +20lgL, wherein Ls is space transmission loss, f is communication frequency, L is satellite-ground communication distance, and the receiving level of the low-orbit micro-nano satellite receiver is as follows:
κ＝EIRP-Ls+Gr-Lp-Lo
wherein, EIRP is ground terminal emission, Gr is satellite receiving antenna gain, Lp is polarization loss, and Lo is other losses.
Optionally, the selecting and configuring the optimal communication parameter:
the receive sensitivity of the LoRa module is as follows:
wherein S is the receive sensitivity, N is the spreading factor, and BW is the channel bandwidth.
Optionally, the transmitting the data packet: and according to the channel bandwidth and the window period, periodically sending the messages in turn according to the priority order of the messages, wherein the sending period is 1 second, and each message is sent for 10 times, so that the reliable transmission of the messages is ensured.
The invention provides a dynamic reconfigurable satellite-ground low-power-consumption communication technology based on a LoRa system, which has the following beneficial effects: the communication parameters are adjusted by the orbit of the low-orbit micro-nano satellite, so that the influence of the communication distance on a link can be dynamically compensated;
the transmitting power of the ground wearable equipment can be reduced through software optimization without changing the existing hardware and mechanical structure;
the receiver on the low-orbit micro-nano satellite polls the spread spectrum factor and can cover the transmitting signals of various ground wearable devices.
Drawings
FIG. 1 is a schematic diagram of a communication system according to the present invention;
fig. 2 is a schematic view of a flow structure of dynamic reconfiguration of communication parameters according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 2, the present invention provides a technical solution: the utility model provides a low-power consumption communication technology of dynamic restructural star ground based on loRa system, includes that ground wearable equipment and low orbit receive the satellite a little, ground wearable equipment calculates best communication parameter according to current satellite orbit and the geographical position of ground wearable equipment, realizes communication parameter's dynamic reconfiguration, and communication parameter dynamic reconfiguration's flow is as follows: calculating an instantaneous satellite-ground communication elevation angle, calculating an instantaneous satellite-ground communication distance, calculating a satellite-ground link margin, selecting and configuring an optimal communication parameter and transmitting a data message;
keeping the hardware design and the structural design of the existing ground wearable equipment unchanged, and constructing a dynamic reconfigurable low-power-consumption satellite-ground communication link by re-optimizing the software design of the ground wearable equipment; in the satellite-ground communication process, a schematic diagram 1 of a communication system between a low-orbit micro-nano satellite receiver and ground wearable equipment is shown; the ground wearable device mainly calculates the optimal communication parameters according to the current satellite orbit and the geographic position of the ground wearable device, so as to realize the dynamic reconfiguration of the communication parameters, and the flow of the dynamic reconfiguration of the communication parameters is shown in figure 2;
1) calculating instantaneous satellite-ground communication elevation angle
Ground wearable equipment is inside to have the big dipper module, and accessible big dipper satellite carries out self location. Meanwhile, the orbit information of the low-orbit micro-nano satellite can be calculated in advance and injected into the ground wearable equipment, and the information can be updated once per week. The elevation angle gamma in fig. 1 can be calculated by combining the position of the device and the orbit information of the satellite.
2) Computing instantaneous satellite-to-ground communication distance
From the geometric knowledge, the relationship between the elevation angle β and the geocentric angle α is:
wherein, R is the radius of the earth, and H is the height of the satellite from the ground.
From the cosine theorem, it can be known that:
and L is the satellite-ground communication distance, and the satellite-ground communication distance can be calculated by calculating the one-dimensional quadratic equation.
3) Calculating satellite-to-ground link margin
The spatial propagation loss is:
Ls＝32.44+20lgf+20lgL
wherein Ls is space transmission loss, f is communication frequency, and L is satellite-ground communication distance.
The receiving level of the low-orbit micro-nano satellite receiver is as follows:
κ＝EIRP-Ls+Gr-Lp-Lo
wherein, EIRP is ground terminal emission, Gr is satellite receiving antenna gain, Lp is polarization loss, and Lo is other losses.
4) Selecting and configuring optimal communication parameters
The receive sensitivity of the LoRa module is as follows:
wherein S is the receive sensitivity, N is the spreading factor, and BW is the channel bandwidth.
The LoRa module supports 6 types of spreading factors, and N is greater than or equal to 7. From the above equation, the sensitivity of the receiver can be improved by 2.5dB for every 1 increase of the spreading factor, and the disadvantage is that the increase of the spreading factor will result in the decrease of the channel bandwidth. The difference value between the receiving sensitivity of the receiver and the receiving level of the low-orbit micro-nano satellite receiver is the level margin of the whole communication link, so that the spreading factor larger than 8 is selected on the basis of unchanging the channel bandwidth according to the actual requirements of the satellite orbit and the channel bandwidth, the level margin is ensured to be larger than or equal to 3dB, and the reduction of the transmitting power of the ground wearable equipment can be realized.
5) Transmitting data messages
And according to the channel bandwidth and the window period, periodically sending the messages in turn according to the priority order of the messages, wherein the sending period is 1 second, and each message is sent for 10 times, so that the reliable transmission of the messages is ensured.
The low-orbit micro-nano satellite receiver is provided with time windows, different time windows are allocated with different spreading factors, signals sent by ground wearable equipment can be correctly received, each time window is 2.5 seconds, and 10 seconds are needed for polling once.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (6)
1. The utility model provides a low-power consumption communication technology of dynamic restructural star ground based on loRa system, includes that ground wearing formula equipment and low orbit receive the satellite a little, its characterized in that: the ground wearable equipment calculates the optimal communication parameters according to the current satellite orbit and the geographic position of the ground wearable equipment, and realizes the dynamic reconfiguration of the communication parameters, wherein the flow of the dynamic reconfiguration of the communication parameters is as follows: calculating the instantaneous satellite-ground communication elevation angle, calculating the instantaneous satellite-ground communication distance, calculating the satellite-ground link margin, selecting and configuring the optimal communication parameters and transmitting data messages.
2. The dynamic reconfigurable satellite-ground low-power-consumption communication technology based on the LoRa framework is characterized in that: the computing instantaneous satellite-ground communication elevation angle: the ground wearable equipment is internally provided with a Beidou module, the Beidou satellite can be used for self-positioning, the orbit information of the low-orbit micro-nano satellite can be calculated in advance and injected into the ground wearable equipment, the information can be updated once per week, and the elevation angle gamma in figure 1 can be calculated by combining the orbit information of the equipment self position and the satellite.
3. The dynamic reconfigurable satellite-ground low-power-consumption communication technology based on the LoRa framework is characterized in that: the computing a transient satellite-to-ground communication distance: from the geometric knowledge, the relationship between the elevation angle β and the geocentric angle α is:
wherein R is the radius of the earth, and H is the height of the satellite from the ground;
from the cosine theorem, it can be known that:
and L is the satellite-ground communication distance, and the satellite-ground communication distance can be calculated by calculating the one-dimensional quadratic equation.
4. The dynamic reconfigurable satellite-ground low-power-consumption communication technology based on the LoRa framework is characterized in that: the satellite-ground link margin is calculated: the spatial propagation loss is: the Ls is 32.44+20lgf +20lgL, wherein Ls is space transmission loss, f is communication frequency, L is satellite-ground communication distance, and the receiving level of the low-orbit micro-nano satellite receiver is as follows:
κ＝EIRP-Ls+Gr-Lp-Lo
wherein, EIRP is ground terminal emission, Gr is satellite receiving antenna gain, Lp is polarization loss, and Lo is other losses.
5. The dynamic reconfigurable satellite-ground low-power-consumption communication technology based on the LoRa framework is characterized in that: the selecting and configuring of the optimal communication parameters:
the receive sensitivity of the LoRa module is as follows:
wherein S is the receive sensitivity, N is the spreading factor, and BW is the channel bandwidth.
6. The dynamic reconfigurable satellite-ground low-power-consumption communication technology based on the LoRa framework is characterized in that: the transmitting data message: and according to the channel bandwidth and the window period, periodically sending the messages in turn according to the priority order of the messages, wherein the sending period is 1 second, and each message is sent for 10 times, so that the reliable transmission of the messages is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210194990.1A CN114531727B (en) | 2022-03-01 | 2022-03-01 | Dynamic reconfigurable satellite-ground low-power consumption communication system based on LoRa system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210194990.1A CN114531727B (en) | 2022-03-01 | 2022-03-01 | Dynamic reconfigurable satellite-ground low-power consumption communication system based on LoRa system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114531727A true CN114531727A (en) | 2022-05-24 |
| CN114531727B CN114531727B (en) | 2024-04-26 |
Family
ID=81627450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210194990.1A Active CN114531727B (en) | 2022-03-01 | 2022-03-01 | Dynamic reconfigurable satellite-ground low-power consumption communication system based on LoRa system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114531727B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116208230A (en) * | 2023-01-19 | 2023-06-02 | 长光卫星技术股份有限公司 | Satellite autonomous data transmission rapid judgment and task parameter calculation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6157896A (en) * | 1996-12-30 | 2000-12-05 | Southwest Research Institute | Geolocation communications method during visibility between an earth-orbit satellite and a transmitter and receiver |
| CN112383340A (en) * | 2020-10-30 | 2021-02-19 | 南京邮电大学 | Terminal node transmission signal Doppler precompensation method based on LoRa system |
| CN112887008A (en) * | 2021-01-18 | 2021-06-01 | 上海航天测控通信研究所 | Space-based VDES (vertical double-layer data storage) based downlink communication link parameter determination system and method |
| CN113890593A (en) * | 2021-10-29 | 2022-01-04 | 西安外事学院 | Satellite link power control method based on self-adaption |
| WO2022003387A1 (en) * | 2020-07-02 | 2022-01-06 | Eutelsat S A | Methods for the transmission of data between a resource-constrained device and a non-geostationary satellite and associated system |
-
2022
- 2022-03-01 CN CN202210194990.1A patent/CN114531727B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6157896A (en) * | 1996-12-30 | 2000-12-05 | Southwest Research Institute | Geolocation communications method during visibility between an earth-orbit satellite and a transmitter and receiver |
| WO2022003387A1 (en) * | 2020-07-02 | 2022-01-06 | Eutelsat S A | Methods for the transmission of data between a resource-constrained device and a non-geostationary satellite and associated system |
| CN112383340A (en) * | 2020-10-30 | 2021-02-19 | 南京邮电大学 | Terminal node transmission signal Doppler precompensation method based on LoRa system |
| CN112887008A (en) * | 2021-01-18 | 2021-06-01 | 上海航天测控通信研究所 | Space-based VDES (vertical double-layer data storage) based downlink communication link parameter determination system and method |
| CN113890593A (en) * | 2021-10-29 | 2022-01-04 | 西安外事学院 | Satellite link power control method based on self-adaption |
Non-Patent Citations (3)
| Title |
|---|
| ALEXANDER A. DOROSHKIN等: "Experimental Study of LoRa Modulation Immunity to Doppler Effect in CubeSat Radio Communications", 《IEEE ACCESS》, 27 May 2019 (2019-05-27), pages 75721 * |
| 吴庭薇;谢继东;张更新;: "LoRa调制在低轨卫星物联网下适应性研究", 电视技术, no. 09, 5 September 2018 (2018-09-05), pages 28 - 32 * |
| 魏肖等: "基于5G技术的低轨卫星物联网技术", 《移动通信》, 15 March 2020 (2020-03-15), pages 14 - 21 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116208230A (en) * | 2023-01-19 | 2023-06-02 | 长光卫星技术股份有限公司 | Satellite autonomous data transmission rapid judgment and task parameter calculation method |
| CN116208230B (en) * | 2023-01-19 | 2024-02-13 | 长光卫星技术股份有限公司 | Satellite autonomous data transmission rapid judgment and task parameter calculation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114531727B (en) | 2024-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0968576B1 (en) | Satellite telecommunications repeaters and retransmission methods | |
| CN107408979B (en) | Method and apparatus for avoiding exceeding interference limits of non-geostationary satellite systems | |
| EP1733487B1 (en) | Radio communications system and method with diversity operation in a multi-band satellite system with or without an ancillary terrestrial component | |
| US7558568B2 (en) | Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference | |
| EP2283540B1 (en) | A system and a method for mast vibration compensation | |
| JP4529375B2 (en) | Wireless relay device | |
| CN110474971A (en) | A kind of wide area low-power consumption Internet of Things communication system and its transmission method | |
| US20090186622A1 (en) | Systems and Methods for Modifying Antenna Radiation Patterns of Peripheral Base Stations of a Terrestrial Network to Allow Reduced Interference | |
| WO2020088100A1 (en) | System and method for enhancing airspace coverage capability of mobile communication base station | |
| EP1900130A2 (en) | Method and device for indirect communication within a wimax network | |
| CN114531727B (en) | Dynamic reconfigurable satellite-ground low-power consumption communication system based on LoRa system | |
| Barbarić et al. | Link budget analysis for a proposed Cubesat Earth observation mission | |
| Roy | Spatial division multiple access technology and its application to wireless communication systems | |
| CN114697902A (en) | Unmanned aerial vehicle swarm networking measurement and control communication link and communication method | |
| CN111756430A (en) | Internet communication method, system and terminal equipment based on low-orbit satellite | |
| CN113873536B (en) | Low orbit satellite wave beam design method and system based on interference avoidance | |
| JP2002043996A (en) | Method and apparatus for controlling transmission power threshold in satellite communication system | |
| Roy | An overview of smart antenna technology: the next wave in wireless communications | |
| Sidibeh et al. | IEEE 802.11 optimisation techniques for inter-satellite links in LEO networks | |
| CN114567369B (en) | Half-duplex data forwarding method and system for satellite Internet of things | |
| KR102377809B1 (en) | Mobile satellite communication device, satellite communication equipment and method | |
| CN111092649B (en) | Single big dipper location fairway buoy based on global low orbit satellite communication | |
| Rahim et al. | Estimation of communication link on ground sensor terminal (GST) system for nanosatellite (UiTMSAT-1) store-and-forward mission | |
| AU683933B2 (en) | A repeater for a mobile radio system | |
| CN116418450B (en) | Intelligent interference detection method for satellite telephone |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |