Modulation research of helicopter landing using ultraviolet guiding technology in atmospheric turbulence

In order to study effect of different modulations on performance of wireless ultraviolet(UV) communication systems in atmospheric turbulence, the expressions of bit error rate (BER) using on-off keying(OOK) and pulse position modulation (PPM) based on UV non-line-of-sight(NLOS) communication model in weak turbulence were derived. Helicopter landing model using UV guiding technology was introduced and effect of transmission power, range, transmitter (Tx) beam divergence, receiver (Rx) field of view (FOV), Tx and Rx elevation angle on BER under different modulations were simulated. The results show that BER under different modulations decreases with the increase of transmitted power, Tx beam angle and Rx FOV, while increases with the increase of range, Tx and Rx elevation angle. Under the same condition, PPM has a better BER performance than OOK. BER decreases with the increasing of modulation order. The results have applicable values for improving the jamming-rejection capability of ultraviolet communication systems in atmospheric turbulence.