A method of time synchronization signal processing based on fm frequency modulation broadcasting signal

Abstract

The invention discloses a time synchronization signal processing method based on FM broadcast signals. The method comprises the steps that the FM broadcast audio signals are subjected to A / D sampling and converted into digital voltage values; real-time detecting and processing are conducted to obtain feature results of the FM broadcast audio signals; the feature results are judged and matched with five-short-and-one-long signals to complete time synchronization. When integral time approaches, the digital voltage values are processed and judged in real time so as to start real-time detection of the five-short-and-one-long signals for FM integral time broadcasting. According to the method, time synchronization is realized through a mode matching method; since time synchronization can be realized just by conducting simple A / D sampling on the FM broadcast audio signals, the implementation difficulty is low, and cost is low; moreover, the time synchronization accuracy is high and can reach 20 micron seconds theoretically; a common microprocessor can be used for time synchronization, so that the application range is wide.

Description

technical field [0001] The invention relates to a method for time synchronization of a wireless sensor network, in particular to a method for processing time synchronization signals based on FM broadcast signals. Background technique [0002] Wireless sensor network (Wireless Sensor Networks, WSN) is a frontier hot research field that is currently attracting attention, involving a high degree of cross-discipline and highly integrated knowledge. In wireless sensor networks, time synchronization is an important part. Sensor data fusion and sensor node self-location require the clocks between nodes to be synchronized. [0003] At present, the methods widely used in time synchronization of wireless sensor networks mainly include GPS (Global Positioning System)) and NTP (Network Time protocol). GPS has high synchronization accuracy, but its cost is high, energy consumption is large, and synchronization accuracy will be greatly affected in harsh environments. NTP can realize hig...

AI Technical Summary

Problems solved by technology

GPS has high synchronization accuracy, but its cost is high, energy consumption is high, and synchronization accuracy will be greatly affected in harsh environments

NTP can achieve high-precision computer time calibration on the network, but it is computationally intensive and has a large computational overhead

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