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Antenna adjustment method and device, ground station and low-orbit satellite

An adjustment method and technology of an adjustment device, which are applied to antennas, radio transmission systems, electrical components, etc., can solve the problems of increased complexity, limited satellite communication frequency resources, limited satellite power, etc., and improve uplink antenna gain and downlink antenna gain. Effect

Inactive Publication Date: 2017-04-05
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main challenges of satellite communication are: 1) The power of the satellite is limited, which is a typical power-constrained system. It is a challenge to provide the maximum bandwidth for ground users within the limited power; 2) The power of ground portable and mobile terminals It is also limited by the size of the power supply and antenna. It is a challenge to increase the uplink bandwidth within the limited power
3) The frequency resources of satellite communication are limited, how to provide greater bandwidth for all users in limited frequency resources is a challenge
[0004] In order to overcome the large channel fading and obtain higher antenna gain, the traditional satellite communication system uses parabolic reflective antennas on both sides of the satellite antenna and satellite ground station, which can greatly improve the antenna gain, but its problems include: 1. Parabolic antenna Generally, there is a definite point. If the ground station antenna needs to track moving low-orbit satellites, or track geostationary satellites on a mobile platform, a special stabilization and tracking platform is required, which greatly increases the complexity.
2. The parabolic antenna on the satellite generally can only statically cover a specific area, providing a static or quasi-static coverage area, but cannot concentrate the transmission power on a specific ground station
3. Due to problem 2, the frequency reuse of satellite uplink and downlink must also be statically configured, and cannot dynamically adapt to the needs and rapid changes of ground dynamic services
However, limited by the size of the satellite antenna and the complexity of the transmitter design, the number of antenna elements of the phased array antenna on the satellite is limited
According to the multi-antenna theory, under a certain number of antenna elements, such as figure 1 As shown, the beam spacing A in the phased array antenna and the number of beams that can be generated, the beam width B (such as figure 2 and image 3 shown) are restricted
At the same time, the external transmission power of the overall antenna is also limited by the overall power of the satellite

Method used

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  • Antenna adjustment method and device, ground station and low-orbit satellite
  • Antenna adjustment method and device, ground station and low-orbit satellite
  • Antenna adjustment method and device, ground station and low-orbit satellite

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0064] Such as Figure 4 As shown, the adjustment method of the antenna may include:

[0065] Step 11, obtaining the current position of the low-orbit satellite, wherein the current position is the moving orbit position where the low-orbit satellite is located at the current time;

[0066] Step 12, obtaining the positional relationship between the current position and the first position of the first ground station;

[0067] Step 13, according to the positional relationship, adjust the first phased array antenna of the first ground station so that the beam of the first phased array antenna points to the low-orbit satellite within a preset angle range current location.

[0068] In the above-mentioned steps 11 to 13, since the orbital position of the low-orbit satellite is different at each time, by obtaining the current position of the low-orbit satellite (step 11), and then according to the real-time current position of the low-orbit satellite and the first ground station po...

no. 2 example

[0074] In order to enable interaction between the information of the first ground station and the low-orbit satellite, and improve the security of the exchanged information, the adjustment method of the antenna also includes:

[0075] Step 14, sending the first position of the first ground station to the low-orbit satellite through an uplink control channel, wherein the uplink control channel includes a dedicated access channel and a shared control channel of the first ground station, Wherein the common control channel includes at least one first subcarrier, and the dedicated access channel includes at least one second subcarrier, wherein the first subcarrier carries the random access or uplink control signal of the first ground station make.

[0076] It should be noted that the uplink control channel uses different frequencies or carriers, and the overall frame structure of the uplink channel is based on OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequen...

no. 3 example

[0078] The adjustment method of the antenna may include:

[0079] Step 111, obtaining the motion orbit information and the current time of the low-orbit satellite, wherein the motion orbit information includes orbit elements;

[0080] Step 112, obtaining the first position of the first ground station, and determining the current position of the low-orbit satellite according to the motion orbit information, the current time and the first position;

[0081] Step 131, according to the current position of the low-orbit satellite at the current time, determine the angle between the current position and the first position of the first ground station;

[0082] Step 141, perform phase modulation on the first phased array antenna of the first ground station according to the included angle.

[0083] In the above-mentioned steps 111 to 141, the angle between the current position of the low-orbit satellite and the first position of the first ground station is determined by the orbit elem...

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Abstract

The invention provides an antenna adjustment method and device, ground station and low-orbit satellite, relating to the field of communication. The antenna adjustment method includes acquiring the current position of the low-orbit satellite, wherein the current position is the moving orbital position where the low-orbit satellite is located at the current time; obtaining the position relation between the current position and the first position of a first ground station; and adjusting the first phased array antenna of the first ground station according to the position relation to make the beam of the first phased array antenna direct to the current position of the low-orbit satellite within a preset angle range. In this way, the uplink antenna gain and the downlink antenna gain are improved, and the communication between the ground station and low-orbit satellite is realized.

Description

technical field [0001] The invention relates to the communication field, in particular to an antenna adjustment method, device, ground station and low-orbit satellite. Background technique [0002] With the development of satellite communication technology and the needs of high-speed broadband services in remote areas, the use of satellites to provide high-speed broadband Internet services for high-speed rail, aircraft, ships, and remote areas has become a widely adopted solution. [0003] The main challenges of satellite communication are: 1) The power of the satellite is limited, which is a typical power-constrained system. It is a challenge to provide the maximum bandwidth for ground users within the limited power; 2) The power of ground portable and mobile terminals It is also limited by the size of the power supply and antenna. It is a challenge to increase the uplink bandwidth within the limited power. 3) The frequency resources of satellite communication are limited,...

Claims

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Application Information

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IPC IPC(8): H01Q3/34H04B7/185
CPCH01Q3/34H04B7/18578
Inventor 陈奎林高嘉进
Owner CHINA MOBILE COMM GRP CO LTD
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