Summary of four radiolocation technologies
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2022-03-14
Friends who have watched domestic spy war dramas must have seen that the enemy uses radio reconnaissance equipment to find the radio equipment of our espionage personnel, and then find the hidden personnel. The classic radio direction finding and ranging technology is applied here.
Friends who have watched domestic spy war dramas must have seen that the enemy uses radio reconnaissance equipment to find the radio equipment of our espionage personnel, and then find the hidden personnel. The classic radio direction finding and ranging technology is applied here.
The early radio reconnaissance applied signal strength detection technology, using the strength of the signal received by the receiver to prompt the approximate distance between the transmitting device and the measuring device through sound or indicator lights.
Another detection technique is to use a directional antenna to detect the azimuth of the signal source. By recording the position and direction of the antenna during direction finding, and measuring the intersection point through multi-point measurement, the target position can be measured more accurately. I believe many readers have seen In high school, the group of children who ran around with antennas in order to score extra points for the college entrance examination, the project was called orienteering.
Another radio location technology commonly used in the military, applied to radar, the principle is: use high-frequency electromagnetic waves and directional antennas with high directional capabilities to send extremely short electromagnetic pulses (usually nanosecond time lengths) and record the emission Time point, the receiving device records the receiving time point after receiving the signal transmitted by the target. At this time, the current target position is calculated by the time difference between transmission and reception.
Next is the famous GPS
One of the simplest positioning technology in GPS positioning technology is to use the atomic clock carried by the satellite to send ephemeris data through wireless signals at certain intervals. The device compares the received time and ephemeris to obtain the approximate distance from the satellite. in the same
After receiving the data sent by multiple satellites, the current latitude, longitude and altitude information can be accurately obtained through calculation.
Device positioning can greatly facilitate our life for us. Common mobile phone navigation and car navigation are one of the applications. Other applications such as search and rescue, disaster relief, shipping, aviation, geology, hydrology, and air quality monitoring It is used in the positioning of equipment, as well as the previously mentioned military uses, such as gun-launched radar, radio signal detection, anti-radiation missiles, and so on. It can be said that all aspects of large and small are involved.
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