# Research on the Compound Jamming Method against FDA-MIMO Beamforming
## 5 Simulation Analysis
### Range Bin Analysis Results  
Figure 7 shows the range bin analysis results of the false targets EFT1 and EFT2 and the suppression jamming under non-adaptive beamforming. As can be seen from Figure 7, the output power of the false targets EFT1 and EFT2 was significantly lower than that of the desired target, and their jamming effect was poor and failed to form an effective jamming effect.  
Figure 8 shows the range bin analysis results of the false targets NFT1 and NFT2 and the suppression jamming under non-adaptive beamforming. As can be seen from Figure 8, the false targets NFT1 and NFT2 had high output power as well as the desired target, and at this time the suppression jamming completely covered the desired target, which could form an effective suppression and range deceptive compound jamming effect, and the jamming effect was good, which could effectively interfere with the normal detection and positioning of radar.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**dB** & **20 km** & **42 km** & **54 km** \\ \hline non-adaptive beamforming & 0 & \(-17.9776\) & \(-31.078\) \\ range-angle two-dimensional MVDR & 0 & \(-84.9233\) & \(-85.5253\) \\ adaptive beamforming & & & \\ \hline \end{tabular}
\end{table}
Table 2: Gain comparison table.  
Figure 7: Analysis results of existing jamming range bin under non-adaptive beamforming.  
Figure 9 shows the range bin analysis results of the false targets EFT1 and EFT2 and the suppression jamming under range-angle two-dimensional MVDR adaptive beamforming. As can be seen from Figure 9, the output power of the false targets EFT1 and EFT2 was severely suppressed, and their power was the same as the power of noise; therefore, it could not form an effective jamming effect.  
Figure 10 shows the range bin analysis results of the false targets NFT1 and NFT2 and the suppression jamming under range-angle two-dimensional MVDR adaptive beamforming. As can be seen from Figure 10, the output power of the false targets NFT1 and NFT2 was high, and at this time the suppression jamming completely covered the desired target, and it was little affected by the MVDR adaptive beam, which could form an effective suppression and range deceptive compound jamming effect, and the jamming effect was good.  
Figure 8: Analysis results of new jamming range bin under non-adaptive beamforming.  
Figure 9: Analysis results of existing jamming range bin under range-angle two-dimensional MVDR adaptive beamforming.  
Figure 11 shows the output SINR performance comparison results of the proposed compound jamming and the existing jamming. As can be seen from Figure 11, under the non-adaptive beam, the output SINR of the existing jamming EFT varied with the input SINR. When the input SINR increased to a certain extent, the output SINR of the EFT gradually tended to be stable. Under the adaptive beam, the output SINR of the existing jamming EFT was maintained as relatively stable at a large value, and its jamming effect was weakened. Both under the non-adaptive beam and the adaptive beam, the compound jamming method proposed in this paper can keep the output SINR at a low level all the time, and thus the detection performance of the radar is reduced. The performance of the proposed compound jamming method was significantly better than the existing jamming methods.  
Figure 11: The output SINR performance comparison of jamming technology.  
Figure 10: Analysis results of new jamming range bin under range-angle two-dimensional MVDR adaptive beamforming.  
Figure 12 shows the output SINR performance comparison results of NFT under several anti-jamming technologies. As can be seen from Figure 12, under the non-adaptive beam and adaptive beam anti-jamming techniques, the output SINR of the proposed compound jamming method was lower. The output SINR of the adaptive NSD method tended to be smooth with the increase in the input SINR. The output SINR of all the anti-jamming methods was kept at a low level, and the proposed compound jamming method could produce significant jamming effects.