摘要:
La présente invention concerne un procédé (50) d'estimation d'une direction d'un satellite (20) en phase de transfert, ladite direction dudit satellite étant estimée par rapport à une antenne (30) de mesure en exécutant une pluralité d'étapes (52) de mesure de puissance de réception, par ladite antenne de mesure, d'un signal cible émis par ledit satellite (20), pour différentes directions de pointage de ladite antenne de mesure. En outre, le signal cible comportant une composante sensiblement sinusoïdale, dite « composante mono-fréquence », chaque étape (52) de mesure de puissance comporte une transposition dans le domaine fréquentiel d'un signal numérique, obtenu à partir d'un signal fourni par l'antenne (30) de mesure, de sorte à obtenir un spectre fréquentiel dudit signal numérique sur une bande fréquentielle prédéterminée comportant ladite composante mono-fréquence, et la mesure de puissance pour la direction de pointage considérée est déterminée à partir d'une valeur maximale du spectre fréquentiel.
摘要:
A satellite deployment system has a plurality of releasable dispenser modules that are attached to each other with each module carrying satellites. Each dispenser module acts as an individual final stage with its own propulsion unit and deploys a subset of satellites to the appropriate altitude and orbit. Since each dispenser module can deploy its satellites far from other dispenser modules, the risk of collision among the satellites is greatly reduced, which allows a large number of satellites to be launched in a safe, timely and cost-effective manner.
摘要:
L'invention concerne un système de satellites, comportant un satellite dit porteur (10) et un satellite dit passager (20), présentant chacun une face Terre (15, 25). Le satellite passager (20) est fixé au satellite porteur (10) par des moyens d'accrochage libérables sur commande. Le satellite passager (20) comporte des moyens de propulsion aptes à réaliser son maintien en orbite, et le satellite porteur (10) comporte des moyens de propulsion aptes à réaliser un changement d'orbite du système de satellites, comportant le satellite porteur (10) et le satellite passager (20). Le satellite passager (20) est fixé sur la face Terre (15) du satellite porteur (10) de manière telle que la face Terre (25) du satellite passager (20) est sensiblement perpendiculaire à la face Terre (15) du satellite porteur (10).
摘要:
A method of generating orbital transfers for spacecraft. The method provides an innovative technique for transferring spacecraft from one Earth orbit to another Earth orbit using significant solar gravitational influences. In one particular implementation, the multi-bodies in the transfer determination are the Earth (about which the spacecraft is to orbit) and the Sun (e.g., the Earth and the Sun are the first and second celestial bodies providing multi-body dynamics). The transfer orbit or trajectory is determined to make use of efficient tangential maneuvers by leveraging solar gravitational influences to improve transfer performance. Based on the generated transfer orbit, the spacecraft is controlled to perform one or more maneuvers to achieve a transfer orbit that traverses into a regime where the spacecraft's trajectory is significantly affected by gravity from both the Sun and the Earth. The spacecraft performs a near-tangential orbit insertion maneuver to enter the final orbit.
摘要:
A method comprises removing space debris (110) having a relatively low ballistic coefficient by hastening orbital decay of the debris. A transient gaseous cloud (120) is created at an altitude of at least 100 km above Earth (E). The cloud has a density sufficient to slow the debris so the debris falls into Earth's atmosphere.
摘要:
Bei einer Bergungs- und Abbremsvorrichtung für frei im All fliegende Objekte, insbesondere zum Einfangen von Satelliten und anderen orbitalen Objekten, sind an einem als lenkbares Trägerfahrzeug (1) dienenden Raumfahrzeug (wenigstens eine,) vorzugsweise eine größere Anzahl von diesem abtrennbare und mit einem eigenen Treibsatz ausgestattete Einfangeinheiten (2) angeordnet, die ein über eine Leine (5) lösbar verbundenes und verschließbares Fangnetz (4) aufweisen. Das Trägerfahrzeug ist mit Lageregelungstriebwerken (6) ausgerüstet, um eine Orientierung der gekoppelten Massenkonfiguration als Vorbereitung für die Trennung zu erreichen. Mehrere Einfangeinheiten können dabei zu einer Serien- oder Parallelschaltung zusammengefasst sein. Nach der orientierten Aussetzung/Trennung wird die passive Stabilität der Anordnung genutzt, wobei unter Berücksichtigung des Systemverhaltens der flexibel gekoppelten Objekte auch ohne aktive Lagekontrolle ausreichend Lagestabilität und Genauigkeit gewährleistet ist.
摘要:
The present invention relates to a method and a system to facilitate deorbiting of satellites from Low Earth Orbit (LEO). The Self - deployable Deorbiting Space Structure (SDSS) (18) of the invention attached to a satellite (20) is deformed into a stressed configuration so as to store strain energy on Earth. The strain energy is released in space producing a rapid deployment of the SDSS which increase the surface area of the satellite and in turn increases the aerodynamic drag colliding with air molecules in the residual atmosphere of Earth inducing variations in the satellite orbit.
摘要:
A system and method for highly efficient constellations of satellites which give single, double,k-fold redundant full earth imaging coverage, or k-fold coverage for latitudes greater than any selected latitude is given for remote sensing instruments in short periods of time, i.e., continuous coverage, as a function of the parameters of the satellite and the remote sensing instrument for many different types of orbits. A high data rate satellite communication system and method for use with small, mobile cell phone receiving and transmitting stations is also provided. Satellite instrument performance models, full and partial satellite constellation models, and satellite cost models are disclosed and used to optimize the design of satellite systems with vastly improved performance and lower cost over current major satellite systems.
摘要:
An In Orbit Transportation & Recovery System (10) is disclosed. One preferred embodiment of the present invention comprises a space tug powered by a nuclear reactor (19). The system includes a collapsible boom (110 connected at one end to a propellant tank (13) which stores fuel for an electric propulsion system (12). This end of the boom (11) is equipped with docking hardware (14) that is able to grasp and hold a satellite (15) and as a means to refill the tank (13). Radiator panels (16) mounted on a boom (11) dissipate heat from the reactor (19). A radiation shield (20) is situated next to the reactor (19) to protect the satellite payload (15) at the far end of the boom 9110. The system (10) will be capable of accomplishing rendezvous and docking maneuvers which will enable it to move spacecraft between a low Earth parking orbit and positions in higher orbits or to other locations in our Solar System.
摘要:
A system for providing attitude control with respect to a spacecraft is provided. The system includes a reaction wheel control module configured to control a number of reaction wheel assemblies associated with the spacecraft in order to control attitude, and a maneuver control module configured to use a number of gimbaled Hall Current thrusters (HCTs) to control the total momentum associated with the spacecraft during an orbit transfer. The total momentum includes the momentum associated with the reaction wheel assemblies and the angular momentum of the spacecraft. Using the gimbaled HCTs to control the momentum associated with the reaction wheel assemblies during the orbit transfer results in minimal HCT gimbal stepping.