## 5 Conclusions  
This study proposes a dynamic dual-antenna positioning method for spoofed signals. This technique utilises the carrier body coordinate system information provided by the MIMU to identify the difference between the signal source DOA measured using the short-baseline common-clock dual-antenna method and the actual DOA of the signal source obtained from the ephemeris files, enabling the determination of signal authenticity and source direction. When the baseline length is less than 1 m, the computational error in the yaw and pitch angles of the signal source can remain less than 0.1 rad. In the short-distance case, the yaw angle error is maintained within 0.1 rad so that the direction of the signal source could be effectively determined to satisfy the zeroing angle requirement of the zeroing antenna. In the middle- and long-distance cases, the two-dimensional direction error is maintained within 0.03 rad, which basically meets the demand of multi-position orientation and thus the demand of signal source positioning. With the assistance of an MIMU, the novel common-clock short-baseline dual-antenna method for determining the DOA of the  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Angles Error** & **100 m** & **10 km** & **36,000 km** \\ \hline Yaw & \(\leq\)9\({}^{\circ}\) & \(\leq\)2\({}^{\circ}\) & \(\leq\)0.6\({}^{\circ}\) \\ \hline Pitch & \(\leq\)11\({}^{\circ}\) & \(\leq\)2\({}^{\circ}\) & \(\leq\)0.6\({}^{\circ}\) \\ \hline \hline \end{tabular}
\end{table}
Table 4: The result of test validation.  
Figure 11: Simulation of spoofing signal two-dimensional signal source determining errors. (**a**) Simulation of two-dimensional direction-finding errors for the spoofing signal source; (**b**) simulation of the yaw angle error and 3\(\sigma\) line for the spoofing signal source; and (**c**) simulation of the pitch angle error and 3\(\sigma\) line for the spoofing signal source.  
signal source can rapidly and accurately determine the DOA of the measured source under a minor increase in the size, weight, and arithmetic cost, thereby showing superiority.  
Compared with the conventional methods of spoofed signal suppression, the proposed method effectively suppresses the jamming and spoofing signals by determining the two-dimensional direction of the signal source and incorporating the rapidly evolving zero-tuning antenna technology, thus showing higher application potential. In summary, the proposed method not only improves the measurement accuracy of the DOA of the signal source but also helps to improve the performance of the existing signal spoofing suppression techniques, laying a foundation for future research and application in related fields.  
Conceptualisation, C.Z.; methodology, J.W. and C.Z.; software, D.W. and C.Z.; validation, J.W. and D.W.; formal analysis, D.W.; investigation, all; resources, J.W. and D.W.; data curation, C.Z.; writing--original draft preparation, C.Z.; writing--review and editing, D.W. and C.Z.; visualisation, J.W. and D.W.; supervision, [PERSON] and D.W.; project administration, [PERSON] and D.W.; funding acquisition, [PERSON] and D.W. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Natural Science Foundation of China (Grant No. 61903367).  
The raw data supporting the conclusions of this article will be made available by the authors on request. The data are not publicly available due to their integration within the team's internal database, which is structured for internal access and use. Direct public access to this database is not feasible due to operational, privacy, and security protocols.  
Thanks to [PERSON] of Hunan Boshang Electronic Technology Ltd. and [PERSON] of ComNav Technology Ltd. for providing experimental components.  
The authors declare no conflict of interest.