| Answer | Crossword Clue |
|---|---|
| ECHO | Basic principle of radar. |
| ECHO | Principle of radar. |
| ECHO | The principle of radar. |
| lidars | device similar to radar in principle and operation but using infrared laser light instead of radio waves and capable of detecting particles and varying physical conditions in the atmosphere |
| lidar | device similar to radar in principle and operation but using infrared laser light instead of radio waves and capable of detecting particles and varying physical conditions in the atmosphere |
| ECHO | Radar principle |
| ECHO | Radar principle. |
