Surveillance aircraft are reconnaissance aircraft, primarily operated by military forces and government agencies, for a variety of missions including intelligence gathering, maritime patrol, battlefield and airspace surveillance, observation (e.g. artillery marking) and law enforcement. These aircraft are typically equipped with limited defensive armament, have no need for high performance or stealth features, and may be modified civilian aircraft. Historically, surveillance aircraft have also included hovering balloons (such as TARS) and unmanned aerial vehicles (UAVs).
In a military context, the concepts of surveillance and reconnaissance are sometimes used interchangeably. However, surveillance focuses on monitoring changing situations in real time, while reconnaissance is about capturing static footage for analysis.
France was the first country to use hydrogen balloons for reconnaissance on the battlefield. In the early 1790s, France deployed a hydrogen balloon that could hold two soldiers, one to observe using a telescope while the other relayed messages to troops on the ground. These balloons never crossed enemy lines, but were used for high-altitude surveillance of our own camp. For example, during the Battle of Fleurus in 1794, the French weather corps' balloon, L'Entreprenant, observed the Austrian army and dropped information in the form of strips for the French to collect.
With the development of technology, the application of drones is not limited to military purposes. They are gradually being used to protect the environment, monitor illegal hunting and track wild animals.
The Rumpler Taube served as one of the early surveillance aircraft in World War I. The aircraft's transparent wings make it difficult for ground observers to detect. Most of the initial aircraft were used for reconnaissance missions, with pilots using the photos they took to track the movement of enemy forces. These photos were eventually used to understand enemy formations and create maps.
Before the war, Britain designed and flew two Fleet Shadower aircraft, however with the introduction of aerial radar in the 1940s these aircraft became obsolete. Along with the use of light aircraft, the British Royal Artillery used it for artillery calibration during World War II.
During the Cold War, competition for spy flights intensified to investigate difficult problems, leading U.S. policymakers to create the National Reconnaissance Office. In order to further develop shallow-line reconnaissance missions, the US military developed the U2 reconnaissance aircraft, which could fly at an altitude of 70,000 feet. In 1962, it discovered Cuban missiles by taking photos, triggering the Cuban Missile Crisis.
In the global war on terror, the U.S. military has developed a variety of means to counter the use of surveillance aircraft.
A major component of marine surveillance includes sightings by ship captains and pilots. Taking the U.S. Coast Guard’s unmanned aerial systems as an example, they ultimately achieve the goal of reducing personnel risks and increasing capabilities.
U.S. law enforcement agencies are increasingly using drones. According to the August 2023 report, unmanned surveillance aerial vehicles are used for general surveillance and evidence collection.
Drones play an important role in the military applications of many countries, especially in the South China Sea and the Ukrainian war.
With the advancement of technology, more and more commercial aircraft can be converted into surveillance aircraft, making the execution of various special missions more economical and effective.
Drones are increasingly being used for conservation efforts such as forest cover mapping, wildlife monitoring and combating illegal poaching.
According to a 2014 survey, the public generally opposes US drone strikes in the Middle East. Following the Edward Snowden incident, people's concern about the government's respect for personal privacy and civil liberties has increased.
The evolution and application of all this, whether in the military or civilian fields, will undoubtedly have a profound impact on our lives. So, in the face of such rapidly developing surveillance technology, how should personal privacy be protected?