- Elevation and Azimuth
Elevation angle（仰角）和Azimuth angle（方位角）用于定位，示意图如下：
With Angle of Departure measurement, a device with multiple antennas (Device A) sends the signal using multiple antennas(an antenna array), and the receiving device (Device B) receives all of those separate signals through its single antenna, but is also able to analyze (using something called IQ sample data) the difference between these to estimate the relative signal direction from which they departed.
With Angle of Arrival measurement, something similar is accomplished, but in reverse. A device with a single antenna (Device B) sends a special direction-finding signal to a device with multiple antennas (Device A). That device may use as many as 74 antennas, and then processes those samples to determine which direction the signal came from, based in part on phase differences between what is received at each antenna. This is used to measure the expected angle that the signal originated from.