Development of Non-cooperative Low Frequency Signal Receiving Platform

• 1、Information and Communication School,Harbin Engineering University,Harbin 150001

Abstract：Low frequency signals are widely used in submarine and long-distance communication systems due to their strong penetration and slow attenuation.In communication electronic warfare, low frequency detection and reception system is playing an increasingly important role.For the low-frequency signal receiver, the receiving front end largely determines the communication performance of the receiver. In terms of structure, it mainly includes two parts: automatic gain control (AGC) and back-end digital signal processing.Through the comparison and analysis of the traditional digital AGC circuit structure, this design proposes a new AGC circuit structure, which effectively improves the dynamic range of AGC, and improves the detection algorithm of the system to make it more adaptive in the case of non-cooperative communication.Aiming at the characteristics of traditional channelization scheme, which is expensive and complex in design, an improved channelization structure is proposed, which can effectively save resources and reduce the difficulty of design, and realize the acquisition of high resolution spectrum of input signal. Through hardware design and development, design requirements are realized.

Keywords： Non-cooperative AGC channelization multiphase FPGA