Fig. 1. Signal time spectrum diagram

Fig. 2. Structure of intelligent detection algorithm for large bandwidth time-width communication signal based on spectral decomposition

Fig. 3. Original image is directly fed into the target detection network

Fig. 4. Original image is decomposed and input into the target detection network

Fig. 5. Relative distribution of narrowband signal and spectral decomposition window

Fig. 6. YOLOx algorithm detection process

Fig. 7. The same IOU border overlapping situation contrast

Fig. 8. Diagram of prediction box fusion process

Fig. 9. Performance comparison of detection algorithms

Fig. 10. Performance comparison of intelligent detection algorithms under preclassification of signal targets

Fig. 11. Comparison of detection performance of the proposed algorithm under CIOU loss and IOU loss