#spacetech ## Spacecraft Data Storage 1. Telemetry Data: Spacecraft health & status (location, speed, system health). 2. Command Data: Instructions from ground control, stored or immediate execution. 3. Science Data: Collected by scientific instruments (atmosphere, surface data). 4. Sensor Data: Measures environment & spacecraft state (acceleration, rotation). 5. Stored Sequences: Pre-programmed command series for automated operations. ## Storage Tech - Solid-State Recorders (SSR): Durable, no moving parts. - NAND Flash: Compact, low power, high throughput. ## Data Transmission to Earth - Radio Frequency: Main method, via Deep Space Network (DSN). - Data Rate: Depends on distance & system capabilities (e.g., 2,000 bits/sec for New Horizons). ## Relay vs Communication Satellites - Communication Satellites: Create channels between Earth points, many apps (TV, internet). - Relay Satellites: Act as intermediaries, often between spacecraft & Earth. ## Key Systems - DSN: Array of giant antennas, global coverage for interplanetary missions. - TDRS (NASA): Geosynchronous, serves NASA spacecraft like ISS. ## Data Integrity - Crucial for mission success, ground monitoring & scientific collection.