Research on interference avoidance effect of OneWeb satellite constellation's progressive pitch strategy

Abstract

Summary Due to the scarcity of spectrum resources, the non‐geostationary orbit (NGSO) satellite constellations, which have achieved rapid development in recent years, have to deal with the challenge of spectral coexistence with geostationary orbit (GSO) satellite systems. OneWeb has put forward the “progressive pitch” strategy for GSO networks protection; however, the technical details are not exposed. Herein, we propose a method to obtain the exact progressive pitch parameters suitable for OneWeb system in terms of the technical route of this strategy. Constrained by GSO satellite system's interference protection criterion, an optimization problem is formulated by mathematical modeling of the spectral coexistence scenario between OneWeb system and a GSO satellite system. This optimization problem is resolved by a set of transformations, and the progressive pitch parameters with less loss of the system service capability are obtained. In addition, numerical simulation results verify the effectiveness of the progressive pitch strategy with our obtained parameters for interference avoidance in most parts of the world, but service blind areas of OneWeb system may appear in some time. Finally, we briefly analyze the causes and elimination ways of the blind areas.

On the Security of LEO Satellite Communication Systems: Vulnerabilities, Countermeasures, and Future Trends

“…Some schemes rely on so-called beam drifting in LEO SCSs, which force the LEO satellite users into the adjacent beam even before interference actually occurs [48], [136]- [138]. The authors of [136] conceived a sophisticated strategy for reducing the downlink interference inflicted by LEO satellites on GEO satellite users.…”

“…The authors of [137] mitigated the interference between LEO and GEO satellites by appropriately tilting the transmission direction of the phased array based antennas of LEO satellites by solving a nonlinear programming problem used for finding the optimal direction. OneWeb adopted the method of [138] for LEO SCSs to avoid The dynamical configuration of the linear thin array is proposed to form lower level side-lobes and nulls. 2011…”

“…Beam drifting Adjusts the angle of the spot beams or even turn off some spot beams of LEO satellites directly to avoid the interference. [138] 2019…”

Radio resource allocation for multi‐antenna gateway stations of diverse NGSO constellation networks

“…On one hand, to mitigate the co-frequency interference, a number of approaches have been proposed. The authors in [15][16][17][18] proposed interference mitigation schemes based on adaptive power control, directions of antennas, beam edge positions, and so on. Researchers adopted beam forming (BF) and dynamic channel assignment schemes for users subject to the interference constraint in downlink transmission [19,20].…”

Exclusion zone minimization and optimal operational mode selection for co‐existent geostationary and non‐geostationary satellites

“…10 A method based on the interference protection criterion of the GEO satellite system is proposed to derive exact progressive pitch parameters suitable for LEO system in terms of the technical route of this strategy. 11 Spatial isolation in LEO-GEO co-existence is proposed to keep the interference at required levels. 12 NGEO-GEO interference is also evaluated based on probabilistic analysis of the location of LEO satellite.…”