Surviving in Denied Environments — Assured PNT for Aerospace & Defense

Modern military operations depend on GPS/GNSS for positioning, navigation, and timing — but adversarial jamming and spoofing capabilities have transformed these once-reliable systems into potential liabilities. When GNSS is denied, SiTime's ruggedized MEMS oscillators provide the precision holdover that keeps missions on track. For the fundamentals of PNT timing architecture, see SiTime PNT Timing Foundation — Part 1 of this PNT series.

Figure 1: SiTime MEMS timing for aerospace and defense — precision PNT in contested environments.

The Threat Landscape

Jamming: Electronic jamming devices — commercially available for under $100 — can overwhelm GNSS receivers, preventing signal acquisition entirely. Spoofing: More sophisticated attacks broadcast counterfeit GNSS signals to deceive receivers into reporting false positions or times. Cyber vulnerabilities: Network-connected timing systems face software compromise risks requiring defense-in-depth architectures.

Military-Grade Holdover Solutions

SiT7111 Epoch OCXO — Extended Mission Holdover

For platforms requiring 12–24 hour holdover, the SiT7111 delivers ±1 ppb frequency stability with exceptional Allan deviation of 5×10⁻¹² at 10 seconds and ±0.01 ppb/°C frequency slope. Industry-leading stability during temperature transients ensures continuous precision when GNSS is unavailable.

ENDR-TTT Super-TCXO — Vibration-Immune Tactical Timing

With industry-leading 0.004 ppb/g acceleration sensitivity — 250× better than standard quartz TCXOs — the ENDR-TTT operates across -55°C to +125°C while consuming only 22 mW at 1.8V. It achieves >100,000 g shock survival with ±50–500 ppb stability and -151 dBc/Hz phase noise at 10 kHz.

SiT7201/SiT7202 Low-Noise Super-TCXO — Radar & Electronic Warfare

Delivering RF-quality phase noise that remains stable under mechanical vibration, the SiT7201 achieves -159 dBc/Hz at 10 kHz offset, 1×10⁻¹¹ Allan deviation at 10s, 20,000 g shock survival, and OCXO-quality performance at just 110 mW — ideal for AESA radar, EW suites, and counter-UAS systems.

Platform-Specific Holdover Requirements

For detailed specifications, evaluation kits, or application support for aerospace and defense timing solutions, contact our technical sales team. Browse our complete oscillator portfolio for additional timing solutions.