What Are Aerospace and Electronic Systems?

Aerospace and electronic systems are the integrated hardware and software technologies that enable the operation, navigation, sensing, and protection of aircraft, spacecraft, and ground-based support facilities. The field combines aerospace engineering principles with electronics, signal processing, and control theory to address the unique demands of airborne and space environments: extreme temperature ranges, vibration, radiation, and the need for very high reliability. It includes both the offensive and defensive electronic capabilities of military platforms and the navigation and sensing systems common to both civil and military applications.

The IEEE Aerospace and Electronic Systems Society, founded in 1964, is the principal professional organization for this domain, publishing the IEEE Transactions on Aerospace and Electronic Systems, which covers advances from radar signal processing to satellite navigation and electronic warfare.

Radar and Sonar

Radar and sonar are the primary sensing technologies in aerospace and electronic systems. Radar uses transmitted radio-frequency pulses and their reflections to detect, locate, and track objects including aircraft, ships, weather systems, and terrain. Modern pulse-Doppler radars extract both range and radial velocity from the returned signal, allowing airborne radars to separate moving targets from stationary ground clutter. Phased array antennas, in which the beam is steered electronically rather than mechanically by controlling the phase of signals at each radiating element, are standard on modern airborne and shipboard radars because they allow rapid beam positioning without moving parts. Sonar applies the same principles using acoustic waves in water, and is the dominant sensor for submarine detection and underwater navigation because radio waves propagate poorly through seawater.

Electronic Warfare and Countermeasures

Electronic warfare (EW) encompasses military operations that use the electromagnetic spectrum to gain an advantage over an adversary or deny its use to enemy forces. It divides into three main functions: electronic attack, which degrades or deceives enemy sensors and communications through jamming or deceptive signals; electronic protection, which maintains the effectiveness of friendly systems against electronic attack; and electronic support, which involves passive monitoring of the electromagnetic environment to locate and identify emitters. Electronic countermeasures (ECM) are the active components of electronic attack: a jamming system transmits noise, false targets, or modulated signals designed to saturate or mislead an adversary's radar receiver. As documented in the Electronic Warfare and Radar Systems Engineering Handbook published by the Naval Air Warfare Center, the competition between radar design and electronic countermeasure design has driven continuous advances in both fields since the Second World War.

Aerospace Control and Ground Support

Control systems in aerospace applications manage everything from the attitude of a satellite to the thrust of a launch vehicle. Aerospace control systems must meet stringent reliability requirements, often mandating redundant hardware and cross-checking software to detect and isolate faults before they propagate. Ground support encompasses the tracking stations, telemetry networks, launch facilities, and mission control centers that communicate with airborne and space systems, with civil navigation infrastructure coordinated through GPS.gov, the official U.S. government source for GPS information. Propellers and other propulsion actuators are controlled by flight management computers that integrate data from air data sensors, inertial navigation units, and GPS receivers to maintain safe and efficient flight profiles.

Applications

Aerospace and electronic systems have applications in a wide range of disciplines, including:

• Civil and military radar for air traffic surveillance, weather monitoring, and terrain mapping
• Satellite navigation systems including GPS, Galileo, and GLONASS receiver design
• Electronic warfare systems for airborne self-protection and spectrum dominance
• Sonar systems for submarine detection, mine hunting, and oceanographic surveying
• Space mission systems including telemetry, command, and tracking networks