一种直采式宽带实时电磁频谱监测方法

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中图分类号： TN97 文献标志码： A

引用格式：，，，等.一种直采式宽带实时电磁频谱监测方法[J].航天电子对抗，2025，41（2）：18-24.

TIAN Mengqihang，WANG Sen，GUAN Wenshuo，WANG Bin （Beijing Zhenxing Institute of Metrology & Measurement，Beijing 1OoO74， China）

Abstract： In view of the complexity of the current electromagnetic environment and the high dependence on electromagnetic spectrum monitoring due to the increase of signal bandwidth，a broadband real-time electromagnetic spectrum monitoring method with direct sampling algorithm structure is presented，the signal processng structure is simplified，and the signal through 4O Gsps high-speed ADC is directly sampled.Real-time spectrum monitoring of 1 MHz～18 GHz signals is realized.A real-time algorithm processing architecture scheme is presented，taking 625 MHz as the frequency boundary point，the combination of digital conversion processng and FFT algorithm for low-band signals is adopted.Rough spectrum measurement for high-band signals is performed and the spectrum with instantaneous frequency value is corrected.While ensuring the overallaccuracy is higher than 30 kHz ，the monitoring accuracy of low-band signals is less than ，ensure stability of the relative frequency resolution. The processing delay of the system is about 3μs ，which has good real-time performance.The simulation results show that the frequency spectrum monitoring accuracy of low-frequency signals is about when the SNR is 0dB ，and the overall frequency spectrum monitoring accuracy is better than 20kHz ，which has certain engineering application value for miniaturized realtime electromagnetic spectrum monitoring.

Key words：direct sampling；electromagnetic spectrum monitoring；digital channelization; CORDIC;digital down-conversion

0 引言

随着现代科技发展，电磁频谱空间已经成为了国家的战略稀缺资源。（剩余7059字）