Frequency Detection Technology In S-Band

Frequency detection technology is widely used in scientific research and electronic warfare detection. With the rapid development of electronic technology.The hardware circuit is improving faster.Algorithm constantly updated.Measuring the high frequency signal gradually becom the modern technology problem.This paper introduces a system which can detect the frequency of s-band high frequency signal.PLL provides frequency step by step.Mixing the known frequency and the unknown frequency. Low-pass filter select the signal which range from OHz to100KHz.For improving the detection precision. A/D make the Analog signals into digital signals.With frequency estimation algorithm. We can carry out digital signal processing and know the signal spectrum.This paper design the Hardware circuit of the Circuit system. We make the simulation of FFT algorithm. We can realize the function of the frequency detection.