Retrograde Orbit Satellite for Geosynchronous Imaging
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Solution Overview
Problem
Current systems struggle to efficiently and frequently inspect and image geosynchronous satellites due to limitations in ground-based electro-optic assets and low earth orbit platforms, which face challenges in collecting high-resolution imagery and maintaining optimal range separation due to orbital dynamics.
Innovation Solution
Deploying satellites in retrograde orbits inclined at approximately 180° to the equator, allowing for rapid revisit of the entire geosynchronous orbit belt, with relative velocities enabling high-resolution synthetic aperture radar imagery collection and other imaging sensors to frequently survey and image satellites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ground-based electro-optic assets are used to detect satellites at GEO altitude, then some objects can be detected, but telescope sizes limit the ability to collect high-resolution imagery
Solution Approach 1:
The patent introduces an intermediary satellite platform in retrograde orbit that acts as a mediator between ground-based telescopes and GEO satellites. This intermediary carrier provides the necessary high relative velocity to enable synthetic aperture radar imaging, thereby achieving high-resolution imagery without requiring extremely large telescopes on the ground.
Solution Approach 2:
The patent replaces the mechanical limitation of ground-based telescope size with a kinetic solution using relative velocity between satellites. By substituting the mechanical aperture size constraint with a velocity-based synthetic aperture approach, high-resolution imaging is achieved through motion rather than through larger physical optics.
2Measurement precision
If ground-based radar systems are used to collect high-resolution imagery independent of range, then high-resolution imagery can be collected, but the extremely small ground velocity of most satellites at GEO makes this difficult or impossible in practice
Solution Approach 1:
Instead of using a stationary ground-based radar system with extremely slow relative motion, the patent inverts the approach by placing the radar system on a satellite in retrograde orbit. This creates high relative velocity (approximately 6.1 km/sec) between the observer and GEO satellites, enabling synthetic aperture imaging to work effectively.
Solution Approach 2:
The patent transforms the static ground-based radar system into a dynamic space-based system with controlled relative motion. By adjusting the retrograde orbit parameters, the system achieves optimal relative velocity for synthetic aperture imaging, turning the imaging process into a dynamic interaction rather than a static observation.
3Measurement precision
If an observer stays within approximately 100 km of a target satellite to maintain optimal range separation, then imaging quality is improved, but the relative velocity becomes less than 10 meters/second and the observer drifts through the entire GEO belt in approximately nine months
Solution Approach 1:
The patent changes the orbital parameters of the observer satellite, specifically using a retrograde orbit with inclination of approximately 180° to the equator. This parameter change creates high relative velocity (approximately 6.1 km/sec) while maintaining optimal range separation, preventing the observer from drifting through the entire GEO belt and enabling frequent revisits.
4Measurement precision
If nearly coincident orbits are used to allow detailed monitoring of one satellite over a long time period, then detailed monitoring is achieved, but time periods on the order of hours are required to collect synthetic aperture imagery and large numbers of satellites cannot be observed
Solution Approach 1:
The patent segments the monitoring task across multiple satellites in retrograde orbit, each responsible for observing a portion of the GEO belt. This segmentation enables detailed monitoring of multiple satellites simultaneously, distributing the observation workload and increasing overall productivity without sacrificing imaging detail.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables frequent revisit and high-resolution imaging of geosynchronous satellites, facilitating rapid data collection and detection of anomalies, with the ability to maintain optimal range separation and reduce imaging time to seconds or minutes, thereby addressing the need for regular monitoring and characterization of satellite status.
Implementation Method 1
means disposed on each satellite for receiving electromagnetic energy from objects (e.g. satellites) within a field-of-view thereof
Implementation Method 2
In a radar implementation, the satellite may include a receive-only capability as part of a bistatic radar or (with a transmitter) monostatic radar system
Data Source
AI summary
A satellite and an arrangement for placing the satellite in a retrograde orbit, i.e. inclined at approximately 180° to the equator. Multiple satellites may be used and the orbits thereof may be circular or elliptical. The invention is well-suited for an illustrative satellite inspection application. In this embodiment, the system includes one or more satellites; means disposed on each satellite for receiving electromagnetic energy from objects (e.g. satellites) within a field-of-view thereof; and an arrangement for placing the inspection satellites in a retrograde orbit. The satellites may be equally spaced in a single orbit or disposed in equally spaced orbits. The satellites may include a variety of instruments including radar, infrared, visible, etc. In a radar implementation, the satellite may include a bistatic or (with a transmitter) monostatic radar system. In the bistatic case, the signal may be transmitted from a ground-based or space based platform.