**4. Conclusions**

In response to the LPI requirements of modern military radar, waveforms with a fixed average power constraint have been designed from the perspective of information flow to minimize the interception performance of a PIS (which is measured by the KLD in this paper) under the condition that both the detection performance and resolution performance of the radar make some concessions. In this paper, we presented a simple information theoretic metric to measure the resolution performance of radar by utilizing the joint entropy theory. Simulations verify the superiority of the designed radar waveforms in radar detection, resolution performance, and the LPI performance.

**Author Contributions:** Conceptualization, J.C. and F.W.; methodology, J.C.; software, J.C., Y.Z. and J.W.; validation, J.C., F.W. and J.Z.; formal analysis, Y.Z. and J.C.; investigation, Y.Z.; resources, J.Z.; data curation, J.Z.; writing—original draft preparation, J.C.; writing—review and editing, J.W. and F.W.; visualization, Y.Z.; supervision, J.Z.; funding acquisition, J.C., J.W. and F.W. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported in part by the National Natural Science Foundation of China under grant 62171229, in part by the Natural Science Foundation of Jiangsu Province under grant BK20190772, and in part by the National Aerospace Science Foundation of China under grant 20200020052005.

**Institutional Review Board Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
