# Project MX46 — Sea Based X-Band Radar Development Support

**Program element:** 0603907C — Sea Based X-Band Radar (SBX)  
**Project:** MX46  
**Component:** Defense-Wide  
**Appropriation:** 0400 — RDT&E, Defense-Wide  
**Budget Activity:** 4 — Advanced Component Development & Prototypes  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0603907C/MX46  
**Parent:** https://hitchintel.com/programs/0603907C

## Summary

Project MX46 — Sea Based X-Band Radar Development Support requests $264.4M in FY2027, 96% of the $274.2M requested for program element 0603907C, up 64% on FY2026. 4 R-2A activities decompose the request. RTX / Raytheon is the largest named R-3 performer at $131.6M, 50% of the project's FY2027 R-3 total.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 186.4 |
| FY2026 | Enacted | 161.1 |
| FY2027 | Request | 264.4 |
| FY2028 | Outyear | 325.6 |
| FY2029 | Outyear | 416.4 |
| FY2030 | Outyear | 394.1 |
| FY2031 | Outyear | 324.8 |

> Estimate types are not summed. This project is one leaf of PE 0603907C; the PE total is the sum of its projects, never added to them.

## What project MX46 buys

This project provides radar capability development, operations, and support for the SBX radar and its three major sub-systems: self-propelled vessel, X-Band Radar (XBR), and communications network.

**R-3 lines of work:** Product Development; Support.

## Named R-3 performers

| Performer | $M | Share of this project's FY2027 R-3 total |
|---|---|---|
| RTX / Raytheon | 131.6 | 50% |
| STRATEGIC ALLIANCE SOLUTIONS | 0.5 | 0.2% |
| JACOBS | 0.5 | 0.2% |
| Veterans | 0.2 | 0.1% |

> Budget-justification contract funding, not obligations. Shares need not reach 100% — unnamed and government work is in the denominator.

## Activities (R-2A) — 4

| Activity | FY2025 | FY2026 | FY2027 | Move | Page |
|---|---|---|---|---|---|
| XBR Operations and Support | 80.7 | 80.5 | 140.1 | +74% | [a1](https://hitchintel.com/programs/0603907C/MX46/a1) |
| Vessel Operations and Support | 48.6 | 72.5 | 76.7 | +6% | — |
| Vessel in-Port Maintenance/Upgrades | 43.9 | 8.1 | 47.6 | +488% | — |
| XBR Radome Replacement | 13.2 | 0.0 | 0.0 | — | — |

> Activities carry the prior, current and budget year only — no five-year plan. In the request year they partition this project exactly; in earlier years they can under-cover it.

### XBR Operations and Support

- 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…

Full year-by-year narrative: https://hitchintel.com/programs/0603907C/MX46/a1

### Vessel in-Port Maintenance/Upgrades

**FY2027 planned work.** - Initiate required maintenance tasks during the major 2027 in-port maintenance period.

**FY2026 to FY2027 change.** Increase from FY 2026 to FY 2027 provides critical maintenance tasks during the 2027 in-port maintenance period.

**FY2026 plans — current year.** - Completion of required maintenance tasks during the major 2025 in-port maintenance period.

### XBR Radome Replacement

**FY2027 planned work.** - No funding is requested in FY 2027.

**FY2026 plans — current year.** - No funding is requested in FY 2026.

## What is NOT on this page

Congressional marks, the R-2 mission description and acquisition strategy, the industry vs government split of the whole request, and related program elements are recorded at **program-element** grain — an NDAA mark lands on a PE, never on a project. They are at https://hitchintel.com/programs/0603907C.

## Source & machine access

- **Source:** FY2027 Office of the Secretary of Defense RDT&E Budget Justification, Exhibits R-2/R-2A/R-3, PE 0603907C project MX46 (PB PB2027).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0603907C")`.

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