Design and Implementation of a Weak Signal Detecting System Based on LabWindows

Detecting weak periodic signals is widely used in radar, communication, sonar, earthquake and industrial measurement. Generally, the weak signal detection needs special equipments, such as phase sensitive detector and demodulation module, and requires the user to operate and process the receiving data. The article designs and implements a weak signal detecting system, which can detect high frequency near-field signal automatically using universal test equipments and without users’ intervention. Furthermore its effect is demonstrated by detecting a periodic weak signal radiated from certain electronic equipment. The detecting system designed in this article can detect a signal of only several microvolts in a range of twenty centimeters.