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Forgotten Radar Technology: Why Is Passive Radar So Secretive?
In the world of radar technology, we usually hear about active radar, which are systems that detect targets by emitting signals. However, another technology called Passive Radar is rarely mentioned, but it is growing in the background. How does this technology work? Why are they so mysterious?
Basic principles of passive radar
Passive radar technology is a system that detects and tracks objects by analyzing non-cooperative signal reflections from the surrounding environment. Unlike traditional radar systems, passive radar does not have a dedicated transmitter, but relies on third-party signal sources such as commercial broadcasts, communication signals, etc.
In this system, a receiver measures the time difference between a signal arriving directly from a transmitter and the signal after it reflects off an object.
With this information, passive radar can calculate where the target object is and even obtain information such as its speed and heading.
History of Passive Radar
The concept of passive radar is not new. As early as 1935, Robert Watson-Watt of Britain conducted the first radar experiment using a BBC shortwave transmitter, successfully detecting a bomber 12 kilometers away. This process reflects the principles of passive radar and also makes people re-examine the progress of air defense technology.
Many countries have used dual-base systems in their air defense networks since the 1930s.
However, with the continuous advancement of technology, bistatic radar systems were gradually replaced by monostatic radar systems, causing passive radar technology to be forgotten for a time.
Modern Passive Radar Technology
With the advancement of digital technology and computing power, interest in passive radar has resurfaced. Through digital signal processing techniques, designers can now more effectively utilize multiple broadcast signals. Many commercial companies have also begun to develop passive radar systems, such as Lockheed Martin and BAE Systems.
Passive radar technology has gradually become an important part of the new generation of air defense systems in many countries.
Pros and Cons of Passive Radar
Like many new technologies, passive radar has its pros and cons. Advantages include lower purchase cost, less operation and maintenance cost, and better concealment. However, the technology is still in its immature stage and relies on third-party signals, which makes deployment challenging.
Future Development Direction
Currently, research on passive radar systems is booming in various countries, especially for the use of modern digital broadcast signals. Many academic and military institutions are actively exploring how to improve the performance of passive radars so that they can achieve better results in complex environments.
ConclusionAt the same time, existing commercial and academic systems are constantly undergoing technological updates to adapt to current needs and challenges.
Passive radar technology may not be well known to many people, but its potential and application scope are undoubtedly worthy of our in-depth exploration. With the development of science and technology, this technology may play an increasingly important role in the future. So, among these seemingly outdated technologies, are there other underrated innovations that deserve our re-evaluation?
