Bluetooth Signal Detection and Analysis at Address Bearing

The continuous growth of wireless technology requires the development of means of monitoring data transmission devices and networks, and, in particular, wireless Bluetooth personal networks. Therefore, the detection and localization of working Bluetooth devices is an urgent task for radio monitoring services. A two-channel correlation interferometric direction finder can serve as a radio signal bearing tool. It is based on a two-channel radio receiving equipment that is cyclically connected to different pairs of elements of a multi-element antenna system. In order to find packet radio signals, the direction finder accumulates the time samples from different antenna pairs at long intervals; the joint processing of this data allows determining the direction of arrival of radio signals. An obstacle to Bluetooth tracking is the fact that Bluetooth devices use pseudo-random hopping of the operating frequency and a duplex time division. As a result, many devices can simultaneously operate in the same frequency range, generating a chaotic packet alternation on the air. Thus, accumulating information from a particular Bluetooth device becomes problematic for the varying antenna pairs of the direction finder. The aim of the work is to develop a method for the joint identification and bearing of detected Bluetooth network devices. The presented method of address bearing is implemented based on the mobile direction finder “ARTIKUL-M”, used to search for and locate unauthorized sources of radio emissions. It allows detecting signals of the 802.15.1 standard, identifying personal network devices, and generating estimates of the directions to these sources of radio emissions. It is demonstrated that the address bearing of Bluetooth network devices increases the functionality of existing radio monitoring equipment and also makes the localization of unauthorized radio sources possible and effective. #CSOC1120.