Thirty years later, scientists around the world were researching the practical use of radio waves to detect and locate objects. Throughout the 1920s and 1930s, great effort was put into developing a system by which you could transmit and receive radio waves, providing useful information. The object might be an airplane, precipitation in a thunderstorm, bugs in the atmosphere, etc. If the object is moving when the energy hits it, then the microwaves will be Doppler shifted after they have been reflected back, and we can partly measure the object's velocity. The two most basic functions of radar are inherent in the word, the letters of which stand for Ra dio D etection A nd R anging.
All radars share many common functions and characteristics.
The operation of any radar system begins in the Trigger section. Triggering has been justifiably called the heart of a radar system. It is also known by other names, such as synchronizer, trigger programmer, or system timing function. The function of the trigger section is to provide system timing to the entire radar system and ancillary equipment. Radars are composed of many separate functions athat must operate in precise synchronization.