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SpaceRepo Knowledge Hub

website·Indexed 29 days ago

https://spacerepo.com

A curated knowledge hub for space industry engineers providing technical documentation on spacecraft systems engineering, propulsion technologies, and the space environment. Content includes guides on RF link budgets, power and mass budgets, radiation effects (TID and SEE), and propulsion sizing equations such as the Tsiolkovsky Rocket Equation.

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What's inside SpaceRepo

  1. Overview of Spacecraft Mass Budgeting

    Mass Budgeting involves the process of estimating and controlling spacecraft mass properties throughout the entire project life-cycle to ensure the vehicle remains within launch vehicle capabilities and performance requirements.

  2. Establish a spacecraft electrical power budget

    A power budget is used to establish and manage the generation, storage, demand, and margin for a spacecraft's electrical power system to ensure mission viability.

  3. Estimate and control spacecraft mass properties using Mass Budget

    The Mass Budget process is used for estimating and controlling spacecraft mass properties throughout the project life-cycle to ensure the vehicle remains within design constraints.

  4. Build and manage an RF link budget for spacecraft missions

    An RF link budget is used to calculate and manage the end-to-end signal strength and communication viability for spacecraft missions, ensuring that the transmitted signal is strong enough to be received and decoded by the target receiver despite losses and noise.

  5. Understand the Space-Mission V-Model Lifecycle

    The space-mission lifecycle is commonly represented by the V-Model (or "Vee"), which links development activities (left side) with integration and verification activities (right side). This model emphasizes early validation of requirements. NASA specifically tailors this model across six project phases, from Pre-Phase A to Phase F, as formalized in NPR 7123.1C.

  6. Implement geometric shielding and component placement

    Passive radiation reduction can be achieved through strategic spacecraft architecture:

    • Strategic Component Placement: Position sensitive electronics deep within the spacecraft or behind existing mass, such as fuel tanks, to use them as natural shields.
    • Dedicated Shielded Compartments: For extreme environments, use a radiation vault. For example, the Juno spacecraft uses a vault with 1 cm thick titanium walls to reduce radiation exposure to critical electronics by approximately 800 times.

  7. Manage a spacecraft mass budget

    A mass budget tracks every component's dry mass, growth allowance, and contingency to prevent late-stage mass growth that could compromise performance or launch-vehicle capability. Per ECSS-E-ST-10C, design margins and growth factors must be defined early and tracked under configuration control.

  8. Utilize Model-Based Systems Engineering (MBSE)

    MBSE replaces traditional document-centric approaches with digital models (often using SysML or domain-specific languages) to achieve:

    • A single source of truth for requirements, architecture, and verification logic.
    • Early digital simulation of performance and interfaces.
    • Automated consistency checks and documentation generation.

  9. Identify primary sources of space radiation

    Spacecraft beyond Earth's atmosphere are exposed to three primary types of radiation:

    1. Galactic Cosmic Rays (GCRs): High-energy heavy nuclei (protons, helium, and heavier ions) from outside the solar system. They are omnidirectional and provide a constant background threat.
    2. Solar Particle Events (SPEs): High fluxes of protons and ions resulting from solar flares and coronal mass ejections (CMEs). These are transient events with intensity spikes that can occur within hours.
    3. Trapped Radiation (Van Allen Belts): Charged particles trapped by Earth's magnetic field. The Inner Belt consists mainly of high-energy protons, while the Outer Belt is dominated by high-energy electrons from solar wind.

  10. Manage spacecraft mass budgets

    Mass budgeting involves estimating and controlling spacecraft mass properties throughout the entire project life-cycle to ensure the vehicle remains within launch vehicle constraints and performance requirements.

  12. Determine propulsion system selection criteria

    Selecting a propulsion system requires answering three primary questions to narrow the solution space:

    1. Constraints: What are the limits on mass, power, cost, and time?
    2. Mission Objectives: What maneuvers are required (e.g., orbit raising, station keeping, collision avoidance, de-orbiting)?
    3. Risk Tolerance: Is the project a tech demo (accepting new tech) or does it require proven flight heritage?