Wireless Transmission Detection and Monitoring System using GNU Radio and Multiple RTL – SDR Receivers

Abstract

Low cost signal detection and monitoring system is designed in this paper. Wireless Transmission Monitoring is required by security agencies in order to check transmissions taking place in a particular area. In this paper Wireless Transmission Monitoring System is implemented using GNU Radio and RTL-SDR device. The implemented system is capable to monitor signals of GSM Transmission, Commercial FM Broadcast; the system is developed using Software Defined Radio based RTL-SDR hardware. Monitoring System can also be extended as a signal receiver by making certain additions in the designed model. In this paper Multiple RTL-SDR device based signal detection system is also designed. FM signals were successfully detected by the system in laboratory environment.

SDR-Based Spectrum Analyzer Based in Open-Source GNU Radio

“…A system called SwepSense was devised to monitor a large electromagnetic spectrum bandwidth divided in the sub-bands 50 MHz-2.2 GHz; 400 MHz-4.4 GHz and 1.2 GHz-6GHz, with high temporal resolution, based on an USRP whose local-oscillator chip was connected to a saw-tooth generator circuit [14]. In order to cover two distant sub-bands, two RTL units were used to operate as a low-cost spectrum monitoring system, each one covering a specific band, controlled within the GNU Radio environment [15].…”

“…This article describes an 8-bit HackRF One SDR used as a spectrum analyzer, controlled by the open-source GNU Radio environment. In contrast to [15], a Python block inside GNU Radio enables the automatic monitoring of a wide band frequency range with only one SDR, larger than its 20 MHz bandwidth limit. Another approach to cover wide frequency ranges employed parallel-processing, with several host computers connected to an USRP [16], whereas this study is based on a single host PC, running either Windows or Linux Operational Systems.…”