© Mar. 3, 2014 The Trustees of Leland Stanford University, Mark Cappelli, PhD and Nicolas Gascon. This patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. 37 CFR §1.71(d), (e).
The technical field is the system, method and apparatus for launching spacecraft and spacecraft modules into orbit and configuring the orbiting modules as needed into various vehicle configurations. The modules have multiple capabilities necessary for a spacecraft. These are, among others, payload, propulsion, fuel, refinery, resource processing, communications and schema management and optimization.
Monolithic rockets launch payloads into orbit carrying all of the functions for the mission. The monolithic vehicle has launch and maintenance costs associated with a combined vehicle and payload. Payloads in orbit have a limited useful life and expire. The launch components either reenter the atmosphere and burn or orbit as space junk. There is a need for a more efficient spacecraft system to reduce costs with reusable components. Likewise there is a need to have fuel available in orbit to refuel spacecraft modules. Propellant refined in orbit and supplied to modules as needed lowers costs and increases the flexibility of payloads. Likewise, there is a need to provide communications to connect the space vehicles and components to allow the management of a flexible space vehicle schema. And an optimization schema is needed to manage components and assembly of components into space vehicles and the resources for the components and vehicles.
Additional aspects and advantages of this device will be apparent from the following detailed description of examples, which proceeds with reference to the accompanying drawings.
The term space as used in this specification means the region lying beyond an altitude of 100 km above the Earth's mean sea level (MSL). The terms spacecraft, satellite and space vehicle may be used interchangeably and generally refer to any orbiting satellite, interplanetary vehicle or spacecraft system. The term element and module may be used interchangeably and generally refers to components of a spacecraft, satellite or space vehicle. When an element is referred to as being connected, mated or coupled to another element, it can be directly connected or coupled to another element, or intervening elements may be present. Furthermore, connected, mated or coupled may include wirelessly connected, mated or coupled. Likewise the term first and second used to describe various elements does not limit the elements. It is a way to distinguish one from another.
A space schema based on modules allows assembly and reassembly of spacecraft components in space into vehicles. The vehicles provide transportation, consumables, power and propulsion for payloads in support of automated and manned space missions. The vehicles are assembled from modules serving specific functions. For illustration, some of the functions are propellant storage, energy storage, orbit transfer, station keeping, communications, command and control, habitat, and additional functions as needed. The vehicle consists of several modules that each accomplishes specialized tasks.
A payload module contains the resources to be transported by the vehicle. Example are raw materials as inputs for the resource processing facility, refined materials produced by the facility, manufactured hardware, scientific instruments, power plants, habitats, entire vehicles or entire facilities.
A consumables module contains propellants or energy sources such as hydrogen and oxygen, raw materials, or nutrients for living beings.
An electrical power module typically has solar arrays, batteries and a power-processing unit for providing electricity to the other modules. The function of this unit includes power regulation, power routing and switching, voltage regulation, and AC/DC conversion and like electrical systems management functions.
An environmental control module monitors and regulates the vital parameters of the modules within the vehicles, such as temperature, pressure, atmosphere and radiation.
A locomotion and orientation module typically consists of a set of rocket thrusters and their associated propellant tanks and regulation systems for moving the entire vehicle between locations, and for station keeping, drift correction, and rotating the vehicle to a specified direction.
A monitoring, command and communications module manages the flow of information and commands within the vehicle, and between the vehicle and the outside.
The modules are connected through various types of interfaces. Compatible mechanical, communications, and command interfaces allow interchangeability. Interface examples are, mechanical joints, mating mechanisms, consumable transfer valves, electrical connectors and data transfer connector. The vehicle also has various types of interfaces for connection and transfer of resources and data with resources processing facilities and other vehicles. Docking mechanisms, flow pipes and valves facilitate resource transfer. Communications interfaces may be either physical or transmissions in all wavelengths based on data formats, protocols including analog signals. All radiation spectrums may be used for communications.
Modules and elements have different functions and life spans. For example, structural elements have low wear rates and can be used for decades, if not longer. Modules and replaceable elements allow for replacement of old technology and failed components. Uniform interfaces facilitate upgrades and replacement of elements and modules.
A space schema described in this document has a resource processing facility and one or more vehicles, all primarily operating out of the Earth's atmosphere, that is, on or near a celestial body a planet, an asteroid, or other type of celestial body, in near Earth orbit, or in deep space.
As previously described, The vehicles provide transportation, consumables, electric power, propulsion, and other services to payloads in support of a variety of space missions, automated or manned. The vehicles may also transport resources to the facilities and may deliver processed resources to other vehicles. In general, the vehicles comprise several modules each serving a specific function that can be assembled into a single vehicle. An assembled vehicle may include any of these specific functions; propellant storage, energy storage, orbit transfer, station keeping, communications, command and control, habitat and other functions.
A refinery processes resources collected on site or from other locations for use as propellant, energy carriers, structural components, manufactured hardware, life support consumables, and other uses. Facilities may have power plants, resources processing devices, environmental control and process control modules, receiving and delivery interfaces, and may be monitored and controlled on site or remotely. The facilities may be manned or unmanned. Variations of the facilities also have storage modules for resources and end products, and have maneuvering modules for controlling or changing the location of the entire facility. The facilities may come in various configurations: refinery, recycling center, factory, farm, or other configurations.
Components can be engineered for the space environment as required. An example is that all components need not be hardened for radiation. Environmental conditioning is dependent on a module's system requirements and may vary among modules.
Launching modules instead of an entire vehicle allows the use of various launch vehicles with load specific risk considerations. For example, low value payload merits lower reliability launch vehicle and protocol and less expense. For example, propellant or materials for manufacturing may be launched separately thereby minimizing risk to an expensive payload.
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A space schema 100 includes one or more vehicles and resource processing facilities. The vehicles comprise at least one service vehicle module 104 and one payload module 102, which may be mated using a standard interface and may be separated during the mission. The payload module 102 contains the resources to be moved by the service vehicle module 104. For example, the payload module 102 may consist of scientific instruments, telecommunication antennas and transponders, consumables storage such as fuel tanks, human habitats, or combinations thereof. The service vehicle module 104 can consist of a locomotion subsystem for example, a set of rocket thrusters with the associated electric power, propellant storage, delivery and regulation equipment. If demanded, a second service vehicle module 104 can mate the propulsion service module 106 to the payload module 102 to provide locomotion. This second service vehicle module 104 can also serve to fuel or refuel the mated spacecraft with propellant that it obtains by accessing a resources processing facility 108. In the resources processing facility 108, raw materials are received at an interface such as a fluid fill/drain valve and may be stored for later use. The resources processing facility 108 consists of at least one resources processing device, one resources delivery interface, one environmental control device and one process control device.
Another propellant module 106 is shown in orbit as a fuel resource. A service vehicle module 104 may mate with it and move it into LEO for refueling by the refinery module 108. There may be multiple propellant modules 106 parked in orbit as a fuel resource. The resource processing facility 108, referred to as a refinery 108 in this example, may turn raw materials into refined materials for other uses. For example, water collected on Earth or from other sources in space, e.g. from a comet, may be stored in liquid form and delivered to the refinery 108 via the service vehicles 104. The water may be transferred to the storage tanks of the refinery 108 using a system of pipes and flow regulators pressured by water vapor. The refinery 108 may be electrically powered by a system of solar arrays, energy storage, e.g., batteries and power regulation units. The liquid water available in the refinery 108 may be dissociated into gaseous oxygen (O2) and gaseous hydrogen (H2) using electrolysis. The gas products may be stored, for example, in either gaseous or liquid phase in high-pressure tanks for later use.
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Electricity for the electrolysis comes from a power plant 316 consisting of solar arrays, batteries and power regulation units. Electricity also powers other units within the refinery 108. A process control unit 318 can start or stop the electrolysis, regulate the reaction rate, water input flow and gas output flow. An environmental control unit 320 regulates the temperature of the facility components. A communications unit 322 sends the refinery's parameters such as water and gases quantities, electric power consumption, line pressures, temperatures to a remote station or receives commands for the refinery 108. A maneuvering module 324 consisting of rocket thrusters and their associated propellant tanks and regulation systems are attached to the refinery 108 for station keeping.
In the processing facility 300, resources 314 are processed from raw materials or manufactured items that are susceptible to recovery procedures. Metal is one such material as is fluid and carbon based biologic materials.
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In one vehicle assembly configuration 610, an orbit transfer module 608 is mated to a service module 104. After transfer to the geostationary orbit, the service vehicle module 104 and the orbit transfer module 608 are unmated. The orbit transfer module 608 is moved back to LEO and the service vehicle module 104 remains in HEO using high specific impulse rockets.
In another vehicle assembly configuration 612 an orbit transfer module 608 is mated to a payload module 102 that may consist of telecommunications antennas, transponders and support equipment. After transfer to HEO, the orbit transfer 608 and the payload 102 modules are unmated. The payload module 102 is mated to a service vehicle module 104. In this satellite assembly configuration 614, the service vehicle module 104 provides electric power to the payload module 102 and uses high specific impulse (i.e. mass efficient) rockets for keeping the entire assembly 614 on station.
In another vehicle assembly configuration 616 an orbit transfer module 608 is mated to a processed propellant container 606. Once in HEO, the vehicle assembly 616 ferries the propellant container 606 between HEO slots for refueling service vehicle modules 104 that are standing alone or are part of a satellite assembly 614. Once the processed propellant container 606 is depleted, the entire assembly 616 is moved back to LEO, the container 606 and the orbit transfer vehicle 608 are unmated, and the container 606 is mated to the resource processing facility 300 for replenishing.
In another vehicle assembly configuration, an orbit transfer module 608 is mated to a combination of service vehicle modules 104, payload modules 102 and processed propellant containers 606 for transfer to HEO.
The orbit transfer module 608 can accomplish other missions such as the relocation of satellite assemblies in HEO to other orbital slots or move inoperative or obsolete modules/assemblies to a repair/disposal space-based facility not shown.
The space infrastructure described in previous sections is managed by a dedicated management system. The function of the system is to optimize the use of the various modules of the infrastructure for fulfilling its mission and for best performance. For example, in a telecommunication constellation 114, the system can monitor the flow of data through the constellation and respond to an increased flow to or from a ground area, e.g. a city by allocating more transponder capacity to that area. The constellation's structure 114 is flexible as described in previous sections, e.g. the orbital elements altitudes, inclination angles, etc. and the various hardware modules of the constellation can be reorganized to satisfy the operator's needs. In order to respond to changes in data flow, the constellation management system can then use various optimization tools to choose between many options: modify transponder allocation times, move communications payloads to different orbits, etc. Example optimization tools are: evolutionary strategies, genetic algorithms, Monte Carlo simulation approach, and multi-state/multi-objective strategies. The constellation management system comprises data and logic that can be stored in various pieces of hardware such as hard drives or flash memories in one or more modules and can be modified by command or automatically by another software system.
An agent is defined as a spacecraft module, or a set of spacecraft modules, that is capable of receiving external or internal information, processing it and acting upon it. Information may be broadly classified as data and requests. When a data is received, the agent can be either passive or active, whereas when a request is received, the agent is expected to act upon it if possible and according to the rules of operation for this agent.
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A reception module 705 that may be an optical, radar, thermal or mechanical sensor, or a communication antenna first receives the information 701. The output signal from the reception module 705, for example, a time-varying voltage then goes to a pre-processing module 706 and is converted into a format that can be analyzed by the agent in module 707. Examples of pre-processing modules 706 are an analog to digital converter, image recognition software, or speech recognition software. An analysis module 707 then translate the information into a result that is meaningful to the agent in relation to its status, its mission or both, including options on how to react to the information 701. For example, if the agent is a constellations of telecommunication modules that receives a request for more data bandwidth around a specific ground region, the analysis module can evaluate the requirement and determine if the infrastructure has the capability to fulfill the request, and if the answer is yes, the various options for responding to the request such as moving module transponders to different orbits, assigning more power and propulsion modules in support to a module antenna cluster, etc. are considered.
The results from the analysis module 707 are sent to the Decision module 708 and it decides on the best course of actions for the agent. The decision generated by module 708 is sent to a post-processing module 709 for conversion into a format understandable by the agent's output module. Examples of post-processing modules 709 are a language compiler for a mechanical controller or a speech synthesis module. Output modules may be information transmission modules 710; or an RF antenna, instrument module 711, a robotic arm or a propulsion module. In the above example of a communication constellation, module 708 may decide (i) to use a propulsion module to move several payload modules including transponders and antennas to new orbits that will optimize the coverage area over the region specified by the operator, and (ii) to assign or reassign and organize the communication links between the payload modules, the various relays in space and on the ground and the operator.
A description of this exemplary process including examples is given below in table 1.
The system architecture described above can be used as an elementary building block of the global management system of the space infrastructure. Agents can be organized in groups that are characterized by functions, resources, and like capabilities. Each group can have its own meta-agent architecture. For example, one agent can be entirely hosted by a module, with a payload consisting of a transponder and an antenna for relaying communication of data and systems for managing the internal electronics of the module. Compatible modules may be grouped in a cluster orbiting in close formation. To optimize the assembly, a cluster management logic hosted by the management system 702 configures the cluster's module elements, orientation, transmission power and other operational parameters and composition for the selected mission. The resulting configuration may have multiple capabilities and roles. For example it may process signals among modules in accordance with rules in the logic to achieve best performance. In this capacity it may act as a phase array antenna. Or it may be configured to act as a virtual aperture.
The following describes exemplary space architecture and how the management system is used to optimize performance. Modules, such as described in previous sections including without limitation payloads, propulsion modules, resource processing stations, orbit transfer modules, etc. are organized in a star-type satellite constellation in Low Earth Orbit (LEO) as schematically represented in
An example of a mission specific module configuration and use is a scientific mission in the Arctic region collecting and analyzing data on the climate and the fauna. The mission is conducted in coordination with other scientific projects around the globe and requires real-time, high-speed data transmission. Moreover, the scientists in the Arctic are required to changed location often. The mission management team can rent telecommunications capacity from the constellation's operator. On request, selected module groups are unpacked from orbital storage and moved to operational orbits where they are deployed in synthetic aperture cluster configurations. Observation modules and scientists on the ground collect data that is transmitted via the transponder modules.
The constellation management system evaluates and optimizes in real-time the best configurations for the modules clusters including orbital elements, orientation of the synthetic aperture and the best use of the space infrastructure's resources such as number of modules to be used, type of payload, data transmission power, refueling strategies and like characteristics and capabilities.
For example, other missions that may take advantage of the optimized performance of the space infrastructure include information transmission in disaster area, where other communication infrastructures are inoperative or absent, or high-quality, low-cost in-flight entertainment and communication in passenger airplanes.
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The space infrastructure system may use available programming languages and protocols to implement the various management systems and instruments such as sensors, communication instruments, mechanical or chemical hardware, etc. The Common Space Infrastructure Language (CSIL) is a framework for exchange of information using communications protocols, control and command of dynamic hardware and robotics language to provide an interface with human operators. Natural language processing may be used with the human interface. One objective of the CSIL is to give the space infrastructure the best communication tools for dealing autonomously and efficiently with a great number of agents evolving in an environment that can be highly dynamic, complex and hazardous.
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It will be obvious to those having skill in the art that many changes may be made to the details of the above-described examples without departing from the underlying principles of the matter described herein. The scope of the claimed subject matter should, therefore, be determined only by the following claims.
This application claims priority to and the benefit of the filing date of provisional application, U.S. Ser. No. 61/777,215, filed on Mar. 12, 2013.
Number | Date | Country | |
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61777215 | Mar 2013 | US |