Satellite Interference Power Estimation via Orbit Segmentation
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Solution Overview
Problem
Current methods for estimating interference power between satellites and ground radio stations are inaccurate due to wide specified ranges and altitude discrepancies, especially for satellites with elliptical orbits, leading to overestimation of interference and inefficient resource allocation.
Innovation Solution
The proposed method involves projecting satellite orbits onto a map, dividing the orbit into smaller ranges, calculating the lowest altitude in each range, and determining the interference power between the satellite and ground stations, with specific altitude settings for circular and elliptical orbits, and summing interference powers for multiple satellites at the same timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wide specified ranges are used for interference power estimation, then the estimation covers all possible satellite positions, but the accuracy of interference power estimation deteriorates due to altitude discrepancies
Solution Approach 1:
The patent divides the satellite orbit into multiple smaller ranges along the orbital path. For each range, the satellite is assumed to be at the lowest altitude in that range, and interference power is calculated separately. This segmentation allows the estimation to cover the entire orbit while maintaining accuracy by using appropriate altitude values for each segment, thus resolving the contradiction between comprehensive coverage and estimation accuracy.
2Measurement precision
If the lowest altitude is used for interference calculation, then the interference power estimation becomes more accurate, but the computational resources increase due to multiple calculations for different ranges
Solution Approach 1:
The patent calculates interference power for each range using the lowest altitude in that range, which is sufficient to determine the maximum interference impact. This partial action approach (calculating only with lowest altitude for each range rather than all possible altitudes) maintains accuracy while reducing computational burden compared to exhaustive calculations.
3Adaptability or versatility
If multiple satellites are evaluated simultaneously, then the overall interference picture is more complete, but the complexity of interference calculation increases
Solution Approach 1:
The patent applies the same range division method to multi-satellite systems, dividing each satellite's orbit into ranges and calculating interference for each range separately. This segmented approach allows multiple satellites to be evaluated systematically using the same procedure, making the complex multi-satellite evaluation manageable and scalable.
Data Source
AI summary
A projection unit (12) of an interference power estimation device (1) projects an orbit of a satellite onto a map representing a ground surface. A range acquisition unit (13) determines a plurality of ranges on the map so that the projected orbit is included in the ranges. An altitude calculation unit (14) calculates an altitude of the orbit of the satellite in each of the ranges. A range interference calculation unit (16) calculates, for each of the ranges, an interference power between the satellite at a position determined by a latitude and a longitude of the range and the altitude calculated for the range and a radio station installed on the ground surface. An estimation result calculation unit (17) selects, as an estimation result, a maximum value among the interference powers calculated for each of the ranges.