we want to use nRF52833 as BLE5.1 AOA/DOA locator,here are some questions about to how to use it:
- How many antennas are needed for direction finding/positioning? Is 6 enough? What are the maximum and minimum numbers of antennas supported?
- What are the requirements for isolation, polarization, and cross-polarization isolation between antennas?
- Do the polarizations of all antennas need to be consistent? Or should half of the antennas horizontally polarized and the other half vertically polarized?
- Are there any requirements for the lobe width and radiation pattern on a single antenna unit?
- What is the fundamental theory of the direction finding/positioning algorithm? Is there a ready-made algorithm that we can use?
- Should the phase delay of each RF path be consistent? Are the amplitudes required to be consistent? What about phase error and amplitude error index ?
- Can all GPIO ports be configured to switch antenna paths?