# XBR Operations and Support

**R-2A activity** of project MX46 — Sea Based X-Band Radar Development Support  
**Program element:** 0603907C — Sea Based X-Band Radar (SBX)  
**Component:** Defense-Wide · **Budget Activity:** 4  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0603907C/MX46/a1  
**Parent:** https://hitchintel.com/programs/0603907C/MX46

## Summary

This activity requests $140.1M in FY2027, 53% of project MX46, up 74% on FY2026. The R-2A exhibit describes it across FY2026–FY2027, including what the FY2027 money is planned to buy.

## What the FY2027 request buys

**FY2027 planned work.** - Complete initial hardware design of the next generation server architecture required to counter the increased threat vector. - Deliver XBR software build 4.4 formal release. - Initiate MBSE by creating initial models for SBX radar behavior, antenna mount, and functional representation validation. - Initiate SBX GaN TRIMM upgrades to mitigate obsolescence and improve radar performance.

**FY2026 to FY2027 change.** Increase from fiscal year (FY) 2026 to FY 2027 provides for: - Initiation of MBSE by creating initial models for SBX radar behavior, antenna mount, and functional representation validation. - Initiation of SBX GaN TRIMM upgrades to mitigate obsolescence and improve radar performance.

## Before the request year

**FY2026 plans — current year.** - Initiate technology refresh development and prototype for the next generation server architecture.

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 80.7 |
| FY2026 | Enacted | 80.5 |
| FY2027 | Request | 140.1 |

> Prior, current and budget year only — an R-2A activity carries no five-year plan. It sums exactly into its project in the request year and not necessarily in any other.

## Other activities in project MX46

- Vessel Operations and Support — FY2027 76.7
- Vessel in-Port Maintenance/Upgrades — FY2027 47.6
- XBR Radome Replacement — FY2027 0.0

## Source & machine access

- **Source:** FY2027 Office of the Secretary of Defense RDT&E Budget Justification, Exhibit R-2A, PE 0603907C project MX46 (PB PB2027). Narrative is the government's own text.
- **No marks, no contractors at this grain** — congressional marks land on the program element and R-3 performers on the project.
- **MCP:** `mcp.hitchintel.com` — `budget_get_activity`.

*HitchAI is an independent intelligence service, not affiliated with the U.S. Department of Defense. Budget figures are requests/estimates, not obligations.*