Improved Ionosphere D-region Specification for High Frequency Propagation
| Agency | Department of War (DoD) |
|---|---|
| Branch | NAVY |
| Program | SBIR |
| Phase | Phase I/II |
| Topic number | DON27BZ02-NV016 |
| Solicitation | 27.BZ |
| Status | pre-release |
| Released | November 4, 2026 |
| Opens | December 2, 2026 |
| Closes | January 6, 2027 |
Summary
HF and VLF skywave propagation depend on knowledge of the altitudinal structure of the ionosphere for reliable system operation. The D-region ionosphere, a region typically between 60-90 km altitude above the Earth’s surface, is particularly challenging to predict with sufficient fidelity for skywave mission planning because the region is difficult to measure with in situ measurements.
Source: the official topic page on SBIR.gov. Read it, and the solicitation, for the full requirements and the exact deadline.