Recursive Orbit Satellite Constellation Interference Avoidance
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Solution Overview
Problem
Current design methods for non-geostationary orbit communication satellite constellations face challenges in co-existing with geostationary orbit satellites due to common-frequency interference, making it difficult to obtain frequency licenses, especially since geostationary orbit systems take precedence in spectrum resource coordination.
Innovation Solution
A satellite constellation realization method utilizing a recursive orbit is developed, which involves determining orbital parameters such as regression period, semi-major axis, inclination, and eccentricity to achieve on-demand coverage and reduce common-frequency interference by designing satellite trajectories that avoid geostationary orbit satellite interference zones, allowing for multi-coverage and strict airspace isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-geostationary orbit satellite constellation uses common frequency with geostationary orbit satellites, then communication service can be provided, but interference is caused to geostationary orbit satellites
Solution Approach 1:
The patent changes the orbital parameters (inclination, semi-major axis, regression period) of non-geostationary satellites to create recursive orbits with fixed ground track patterns. This parameter modification allows the satellites to systematically avoid geostationary satellite interference zones while maintaining communication service capability.
Solution Approach 2:
The patent divides the orbital space into distinct zones by establishing multiple orbital planes with specific inclinations. Each orbital plane is carefully designed to segment the coverage area such that satellites in different planes do not simultaneously occupy the same interference-prone regions with geostationary satellites.
2Object-affected harmful factors
If orbital parameters are designed to avoid geostationary orbit interference zones, then interference is reduced, but coverage area and service availability may be limited
Solution Approach 1:
The patent merges multiple orbital planes with different inclinations and regression periods to create a composite coverage pattern. By combining the coverage areas of satellites across multiple planes that pass over different longitudes at different times, the system achieves global coverage while each individual plane maintains interference avoidance.
Solution Approach 2:
The patent utilizes the periodic nature of recursive orbits where satellites repeatedly traverse the same ground track patterns. This periodic action ensures that coverage is maintained over time as different satellites in the constellation pass over various regions at different periods, achieving both interference avoidance and comprehensive coverage.
3Object-affected harmful factors
If recursive orbit with fixed regression period is used, then interference avoidance is achieved, but orbital design complexity increases
Solution Approach 1:
The patent establishes specific parameter relationships (regression periods of 1/2, 1/3, 1/4, etc. of Earth's rotation period) that create predictable recursive orbit patterns. By standardizing these parameter relationships, the design process becomes more systematic and manageable despite the complexity of avoiding interference zones.
Data Source
AI summary
The disclosure includes determining a regression period and a semi-major axis of an orbit, inclination, eccentricity and argument of perigee of the orbit; determining both the number of satellites and the number of orbital planes as n; determining right ascension of an ascending node and a mean anomaly of a first satellite, and sequentially determining right ascension of ascending nodes and mean anomalies of subsequent satellites according to satellite service requirements; determining a set of geostationary orbit satellite networks that need to be coordinated, and width of guard band for interference of non-geostationary satellite constellation on geostationary satellite; at any location on the ground, deployed satellites pass overhead successively along fixed trajectory, a user at ground can simultaneously see satellites when multi-coverage is formed; if satellite trajectory crosses the guard band for interference on the geostationary satellite, then when a currently-accessed satellite enters the guard band, user at ground switches to another satellite not in guard band to continue to implement communication.