Nowadays, autonomous payload delivery with drones is develop very fast, in the area of civil, industrial and especially in military. With GPS coordinates system, payload delivery at a reference height and a predetermined location using drones is available. However, the precise payload delivery when navigation by relying GPS is restricted because the accuracy of GPS system at civil level or strength of the GPS connection signals, that can be depend on the weather condition or environment of operation. In this research, the paper provides a solution for development of a drone and proposes a smart triangle algorithm for precise positioning using UWB technique, that can navigate with very high precision. Now, the UWB technique with maximum error in ±10 cm range is clearly better when comparing with 3 to 5 m error in clear view of the sky condition of civil GPS systems.