Key Points Monitors software liveness Triggers recovery on timeout Used in embedded and critical control systems Detects stalled, hung, or unresponsive behavior Expects periodic service or heartbeat events from software Definition Watchdog Timer is a timer that resets or triggers…
Key Points Reduces signal observability Can support protective or stealthy operation Used in contested communications Involves power control, shaping, timing, or spectral behavior Definition Signal Masking is the use of spectral, timing, or power behavior that makes a signal harder…
Key Points Demodulates, processes, and remodulates signals inside the payload before retransmission Regenerates signal content in flight rather than passing signals through transparently Enables more flexible routing, channelization, and signal conditioning than simple repeat architectures Used in satellite communications and…
Key Points Follows moving targets over time Used in satellite, radar, and operations systems Supports alignment and control Can be manual or automated Measurement accuracy and update rate are critical constraints Failure modes include loss of target, stale position information,…
Key Points Shapes and focuses antenna radiation through reflection Works with feed elements in reflector systems Common in parabolic and directional antennas Requires high surface accuracy and structural stability Failure modes include beam distortion, misalignment, and surface deformation Definition Antenna…
Key Points Improves data integrity and reliability Used in communication and storage systems Can recover from some corruption without retransmission Often paired with error detection Adds encoding overhead and processing cost Maximum correctable error rates are code-dependent Definition Error Correction…
Key Points Manages power on the transmit side of a downlink Supports coverage and interference balancing Used in cellular and satellite systems Can react to traffic load or channel conditions Can be fixed or dynamically adjusted based on link conditions…
Key Points Limits low-elevation signal paths Affects low-angle satellite and marine links Causes temporary signal blockage near the horizon Impacts antenna visibility and coverage acquisition More severe in maritime and elevated terrain environments Definition Horizon Masking is the obstruction or…
Key Points Combines multiple orbital regimes (LEO, MEO, GEO) Improves coverage and service flexibility by leveraging different orbit characteristics Used in advanced satellite networks and global communications systems Requires coordination and routing across orbit layers Integrates lower-latency lower orbit systems…
Key Points Covers higher microwave frequencies enabling greater bandwidth capacity Used in satellite communications, earth stations, and fixed wireless links Supports wider channel bandwidths and more compact antenna designs Weather sensitive, particularly susceptible to rain fade and atmospheric absorption Requires…
