CN109921839B - Frequency reuse method of hopping beam communication system - Google Patents
Frequency reuse method of hopping beam communication system Download PDFInfo
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- CN109921839B CN109921839B CN201811459458.8A CN201811459458A CN109921839B CN 109921839 B CN109921839 B CN 109921839B CN 201811459458 A CN201811459458 A CN 201811459458A CN 109921839 B CN109921839 B CN 109921839B
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Abstract
The invention provides a frequency reuse method of a hopping beam communication system, which can realize 2-color reuse and simultaneously reduce interference in the system. The method comprises the following steps: determining a single-satellite scanning coverage area according to a target service area; determining the maximum value of the wave position number; determining the value range of the wave digit and the value range of the antenna beam gain according to the maximum value and the minimum value of the wave digit, and optimizing the shape of the antenna beam directional diagram according to the single-beam service area to form a shape matching relation between the shape of the directional diagram and the shape of a target service area; arranging the wave level in the target service area according to the matching relation to form a wave level arrangement diagram; dividing a wave position layout into a plurality of intervals corresponding to the number of wave beams, wherein each wave beam is responsible for one interval, and the frequency of the wave beams corresponding to adjacent intervals is different; each beam jumps only in the area in charge of the beam, and the angle interval between the same-frequency beams is larger than the fixed beam frequency multiplexing mode, so that 2-color frequency multiplexing is realized without interference.
Description
Technical Field
The invention relates to a frequency reuse method of a hopping beam communication system, belonging to the field of satellite communication.
Background
In a traditional satellite communication system, a beam coverage area is fixed, data is transmitted in a beam in a broadcast mode, and energy is projected to all areas in the area.
In a traditional satellite communication system, wave positions correspond to wave beams one to one, so that the interval between the same-frequency wave beams is at least one time of a wave beam angle, and the frequency space isolation can be realized only by the cellular arrangement mode if the same-frequency wave beams are at least 3-color multiplexing. In this case, the requirement for the antenna pattern sidelobe of each beam is still high, and sidelobes between co-frequency beams interfere with each other, which makes it difficult to improve the signal-to-interference ratio.
Disclosure of Invention
The invention provides a frequency reuse method of a hopping beam communication system, which can realize 2-color reuse and simultaneously reduce interference in the system.
The invention is realized by the following technical scheme:
determining a single-satellite scanning coverage area according to a target service area;
obtaining the minimum value of antenna beam gain after link budget is completed according to the system target capacity; determining the maximum interval time of single beam scanning according to the requirement of the service type on time delay, determining the maximum value of the number of wave positions, determining the minimum value of a beam angle by combining the coverage range of single satellite scanning, and further determining the maximum value of beam gain;
after the value range of the antenna beam gain is determined, an antenna beam directional pattern is designed in the gain range;
optimizing the shape of the antenna beam directional diagram according to the single-beam service area, so that a shape matching relation is formed between the directional diagram shape and the shape of a target service area; arranging the wave level in the target service area according to the matching relation to form a wave level arrangement diagram; dividing a wave position layout into a plurality of intervals corresponding to the number of wave beams, wherein each wave beam is responsible for one interval, and the frequency of the wave beams corresponding to adjacent intervals is different;
on the basis, the hopping beam communication is adopted, each beam only hops in the area responsible for the beam, and the angle interval between the same-frequency beams is larger than the fixed beam frequency reuse mode, so that 2-color frequency reuse is realized without interference.
Further, the determining the coverage of the single-satellite scanning specifically includes: the shape and size of the coverage area are determined according to the geometrical relationship between the satellites, and then the beam is determined to be in a circular shape, a square shape or other shapes according to the phase relationship between the same orbit and different orbits.
Further, the dividing the single beam service area specifically includes: if the single-star coverage range is square, the single-star coverage range is divided into 2-N service areas by adopting a strip shape, and if the single-star coverage range is circular, the single-star coverage range is divided into 2-N service areas by adopting concentric rings, wherein N is the wave position number.
Further, the service area is divided into a plurality of areas according to the principle of keeping the total area of the ground substantially the same.
Further, the forming of the matching relationship between the beam pattern and the target service area shape specifically includes: if the target service area shape is long strip shape, the beam shape is hexagonal.
Further, based on the wave position layout diagram, the shape and the position of each wave position are determined, a phased array element phase table corresponding to each wave position is calculated, a satellite is injected on the phase table, and the satellite extracts corresponding phase parameters according to the phase table before each wave speed jump and directly implements the phase parameters.
The invention has the beneficial effects that:
1. the invention realizes 2-color multiplexing and achieves the highest frequency multiplexing efficiency. The invention can reduce the interference between the same frequency beams in the system, maintain a high signal-to-interference ratio and support high speed, for example, the minimum interval between the same frequency beams can always keep more than 4 times of beam angle, thereby the signal-to-interference ratio can always be more than 20 dB.
2. The circular multiplexing method can reduce the dynamic range of the ground satellite communication terminal transmitting power control to reduce difficulty and save cost, and the dynamic range of the power control in a short time can be controlled within a range of 1 dB.
3. The method for matching the beam shape with the service area shape can reduce the coverage overlapping area, thereby reducing the number of wave bits and reducing the scanning time delay.
Detailed Description
The following describes specific embodiments of the present invention.
The invention relates to a frequency reuse method of a hopping beam communication system, which specifically comprises the following steps:
(1) determining single star coverage area and shape
In a synchronous orbit satellite communication system, a single satellite coverage area needs to be determined according to a target service area, for example, in the whole China area served by a certain satellite, the single satellite coverage area is in the shape of a China map; in a low-earth-orbit satellite communication system, when a satellite moves, the shape and the size of a coverage area need to be determined according to the geometric relationship between the satellite and the satellite, for example, the area covered by a single satellite is determined according to the height of an orbit and the configuration of a constellation, and whether a beam adopts a circular shape, a square shape or other shapes is determined according to the phase relationship between the same orbit and different orbits.
(2) Determining a range of wave position numbers
And after link budget is completed according to the system target capacity and the like, the minimum value of antenna beam gain can be obtained, the maximum value of the beam angle is further determined, and the minimum value of the wave position number can be determined by combining the single satellite coverage range.
Scanning delay is brought by scanning communication, the maximum interval time of single beam scanning is determined according to the requirement of the supported service type on the delay, and the maximum wave bit number can be determined after any wave beam number N is assumed.
(3) Partitioning single beam service areas
After the number of beams is assumed to be N, the service area can be divided into 2-N service areas, if the single-satellite coverage area is square, the single-satellite coverage area is divided into 2-N service areas by adopting a long strip shape, if the single-satellite coverage area is circular, the single-satellite coverage area is divided into 2-N service areas by adopting concentric rings, and the division principle of the size of each service area is to keep the total area of the ground basically the same so as to distribute the same service capacity for the same number of users.
(4) Determining single beam antenna pattern shape
A satellite antenna designer designs an antenna directional diagram according to gain requirements and side lobe requirements, an electric scanning phased array antenna is adopted in a beam hopping communication system, the shape of the antenna directional diagram of each scanning wave position can be flexibly designed, on the basis, the antenna directional diagram is optimized according to the service area shape determined in the step (3), so that a matching relation is formed between the beam directional diagram and the service area shape, the beam arrangement in the next step is facilitated, the overlapping of coverage areas is reduced, for example, if the service area is long strip-shaped, the beam shape is a selectable hexagon, but the beam shape is not a regular hexagon after spherical projection, and the phase needs to be optimized to be matched with the projection shape.
(5) Determining wave position arrangement
After the coverage area of a single satellite, the service area of a single wave beam and the shape of the single wave beam are determined, wave positions can be arranged in the service area one by one according to a method similar to honeycomb arrangement, the shape and the position of each wave position are determined based on the wave position arrangement, the phase of a phased array element corresponding to each wave position can be calculated, a satellite is noted on a phase table, and the satellite directly implements the rapid wave position hopping by taking corresponding phase parameters before the wave speed hopping every time. And considering the deformation influence of the earth curvature on the ground projection of the wave beam, and arranging the wave position in a target service area in three-dimensional simulation software to form a wave position layout.
The method is specifically described below by taking a low-rail broadband satellite communication system as an example.
A constellation communication system is deployed at the position of the orbit height H, the number of orbit surfaces is P, the number of in-plane satellites is M, and the phase parameter is F. Then firstly, the angular range covered by a single star is determined by adopting a spherical trigonometric formula based on the track height and the communication elevation. And selecting to adopt a circular coverage area or a rectangular coverage area according to frequency avoidance requirements, terminal communication requirements and the like.
According to indexes such as terminal aperture, target rate, noise coefficient of a receiving system, maximum transmitting power and the like, satellite-ground link budget is completed by adopting a link budget formula, further EIRP of a single wave beam of the satellite is determined, the transmitting power of the single wave beam is determined under the constraint of the determined satellite power, the minimum gain of the satellite can be determined by combining the EIRP constraint, the maximum wave beam angle of the single wave beam can be determined by adopting a relation formula of gain and wave beam angle, and the minimum wave digit can be determined by adopting a mode of arranging cone angles in a cone according to a total angle area.
Determining the requirement of the service type on the time delay, taking a voice call as an example, and affecting the voice quality to be unacceptable under the condition of time delay exceeding 200ms, thereby determining that the wave bit polling period cannot be greater than 200 ms. According to the frame structure design, if the minimum time slot is designed to be Xms, the maximum 200/X of the single beam wave digit is determined to be taken as an integer downwards, and the maximum beam number is obtained.
And selecting the shape of a service area, dividing the shape of the single-beam service area under the principle that the ground projection area is equal according to the coverage area, the shape and the beam number of the single satellite (determined by the power consumption of the single beam and the power supply of the whole satellite), and further selecting the shape of the single beam.
Under the condition of selecting the shape of a polygonal wave beam, the design of a directional diagram of the phased array antenna is developed, so that the shape of the phased array antenna approaches to an ideal polygon (the ideal shape cannot be achieved actually), the number of calculation points is properly selected, and the phase calculation of the phased array elements in each point selection scanning direction is completed.
And the obtained beam shapes are arranged in the service area one by one, and the phase of each wave position is iteratively corrected for multiple times, so that the ideal arrangement is gradually approached. And storing the corresponding wave bits in a satellite-borne phased array wave control module for calling.
Claims (6)
1. A frequency reuse method for a beam hopping communication system, comprising the steps of:
determining a single-satellite scanning coverage area according to a target service area;
obtaining the minimum value of antenna beam gain after link budget is completed according to the system target capacity; determining the maximum interval time of single beam scanning according to the requirement of the service type on time delay, determining the maximum value of the number of wave positions, determining the minimum value of a beam angle by combining the coverage range of single satellite scanning, and further determining the maximum value of beam gain;
after the value range of the antenna beam gain is determined, an antenna beam directional pattern is designed in the gain range;
optimizing the shape of the antenna beam directional diagram according to the single-beam service area, so that a shape matching relation is formed between the directional diagram shape and the shape of a target service area; arranging the wave level in the target service area according to the matching relation to form a wave level arrangement diagram; dividing a wave position layout into a plurality of intervals corresponding to the number of wave beams, wherein each wave beam is responsible for one interval, and the frequency of the wave beams corresponding to adjacent intervals is different;
on the basis, the hopping beam communication is adopted, each beam only hops in the area responsible for the beam, and the angle interval between the same-frequency beams is larger than the fixed beam frequency reuse mode, so that 2-color frequency reuse is realized without interference.
2. The method for frequency reuse in a beam hopping communication system as claimed in claim 1, wherein said determining a single-satellite scanning coverage specifically comprises: the shape and size of a coverage area are determined according to the geometric relationship between the satellites, and then the beam is determined to be circular or square according to the phase relationship between the same orbit and the different orbit.
3. The frequency reuse method of the hop-beam communication system according to claim 1 or 2, wherein the dividing of the single-beam service area specifically includes: if the single-star coverage range is square, the single-star coverage range is divided into 2-N service areas by adopting a strip shape, and if the single-star coverage range is circular, the single-star coverage range is divided into 2-N service areas by adopting concentric rings, wherein N is the wave position number.
4. A method as claimed in claim 3, wherein the service area is divided into areas that keep the total area of the ground substantially the same.
5. The frequency reuse method of claim 1, wherein the forming of the matching relationship between the beam pattern and the target service area shape specifically comprises: if the target service area shape is long strip shape, the beam shape is hexagonal.
6. The method as claimed in claim 1, wherein the shape and position of each wave position are determined based on the wave position layout, the phased array element phase table corresponding to each wave position is calculated, the phase table is noted with a satellite, and the satellite extracts corresponding phase parameters from the phase table before each wave speed jump.
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| CN110518956B (en) * | 2019-07-25 | 2021-07-20 | 中国人民解放军陆军工程大学 | Time slot allocation algorithm-based hopping pattern optimization method and device, and storage medium |
| CN113300752B (en) * | 2020-02-24 | 2022-08-30 | 大唐移动通信设备有限公司 | Information processing method, device, equipment and computer readable storage medium |
| CN111585635B (en) * | 2020-04-17 | 2021-09-10 | 中国人民解放军国防科技大学 | Satellite internet system design method based on space-frequency hybrid multiple access mode |
| US20230262674A1 (en) * | 2020-07-28 | 2023-08-17 | Beijing Xiaomi Mobile Software Co., Ltd. | Reception indicating method and apparatus, and reception control method and apparatus |
| CN114362802B (en) * | 2020-10-12 | 2023-04-18 | 大唐移动通信设备有限公司 | Signal transmission method, device, equipment and readable storage medium |
| CN114826366B (en) * | 2021-01-19 | 2023-08-29 | 大唐移动通信设备有限公司 | Information processing method, device and readable storage medium |
| CN115551087A (en) * | 2021-06-30 | 2022-12-30 | 中兴通讯股份有限公司 | Microwave signal transmission method and device, storage medium and electronic device |
| CN115942490A (en) * | 2021-09-30 | 2023-04-07 | 大唐移动通信设备有限公司 | Communication method, device, equipment and storage medium |
| CN114285507B (en) * | 2021-12-06 | 2024-02-09 | 中国人民解放军63660部队 | Effective communication distance analysis method based on main lobe deflection angle |
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