Multifrequency Position, Navigation, and Timing (PNT) Antenna Solution

Status changed from Pre-Release to Open

# Q&A Summary of Changes **New Questions Added:** - Q1: Field of view, GNSS signal sources (LEO/MEO satellites), automatic tuner circuits, active vs. passive antenna, and gain specifications - Q2: Band selection/blocking requirements and continuous coverage feasibility **Key Clarifications from New Answers:** - Field of view should be "as large as possible"; beam steering approaches are possible - GNSS signals originate from orbiting satellites (LEO/MEO) - Additional circuitry (tuners, matching networks) is acceptable - Both active and passive antenna designs are acceptable - Passive gain minimum is 1 dBic - Only desired band signals should pass; other bands must be blocked/de-selected **No Changes to Previous Answers:** All prior Q&As (Q3-Q8) remain unchanged, maintaining previous clarifications on: band coverage priorities (L-, S-, C-band focus), simultaneous vs. sequential multi-band operation (sequential acceptable), pre-launch threshold/in-flight reconfiguration objective, no GFI provision, tool flexibility, platform/form factor flexibility, 15,000G Phase II testing, cost ROM requirements, and tuning to specific signals (GPS L1, Galileo E5) rather than entire bands.

Added 7 new Q&As clarifying antenna specifications: multiple simultaneous bands not required (sequential operation acceptable); pre-launch configuration is threshold, in-flight dynamic retuning is objective; primary focus on L-band GNSS and L/S/C-band Signals of Opportunity; electromagnetic performance is primary Phase I focus; no specific platform required (155mm artillery round as smallest reference); 15,000G setback shock testing planned for Phase II; tuning intent is selecting specific M-GNSS/SoOp signal bandwidths (e.g., GPS L1) rather than entire bands.

Added 1 new Q&A clarifying proposal submission format (no template required; follow Army Volume 2 component instructions). Existing Q&As on antenna specifications and cost limits ($300,000) were renumbered but content unchanged.

Added new Q1 addressing antenna specifications: no specific size requirement, 4-8 cm square footprint appropriate, primary focus on GNSS L-band and Signals of Opportunity (L-, S-, C-bands), continuous UHF to X-band operation objective, minimum 1 dBic gain required. Q2 cost limit clarification ($300,000) retained.

The Phase I cost limit was reduced from $3,000,000 to $300,000, representing a tenfold decrease in available funding for this topic.

This Q&A clarifies that Phase I submissions have a maximum cost limit of $300,000 and a 1-6 month performance period, correcting a potential misreading of the solicitation language.

New opportunity: Multifrequency Position, Navigation, and Timing (PNT) Antenna Solution