Engineering the Physical Layer of Distributed Coherent RF Systems
Full-stack physical layer solutions for distributed arrays — collapsing phase and timing alignment into a single topology-agnostic step via channel reciprocity. No PPLI. No GPS. Near-ideal N² array gain.
Physical-Layer Architectural Pillars
Resolving complex physical-layer synchronization constraints through high-fidelity signal processing, mathematical algorithms, and ruggedized system integration.
Spatial-Temporal Distributed MIMO
Near-ideal N² power-combining gain (±0.25dB) under dynamic ad-hoc sensor arrangements. Reciprocity-based architecture bypasses coordinate-based array pointing — no GPS, no PPLI, no external timing grids.
Picosecond Timing & Synchronization
Sub-nanosecond ranging and wireless time transfer algorithms synchronizing clocks across distant nodes. 10ps-level precision unlocks Ka-band distributed coherence, bistatic SAR, and GPS-independent TDoA positioning.
High-Kinematic Doppler Correction
Neutralizing heavy kinematic delays and Doppler shifts on rapid tactical UAV and aerospace hardware. Predictive feed-forward compensation maintains coherent locks in extreme dynamic environments.
AI-Driven FPGA Development
Accelerating FPGA/DSP iteration through AI-driven workflows combining RapidWright, FireSim (LiteFury), and custom LLM models. Collapsing design-to-validation cycles from days to minutes for complex signal processing pipelines.
Ad-Hoc Mesh & Navigation
Topology-agnostic beamforming, TDoA navigation, and time-of-flight ranging for precision indirect fire and array self-localization in GPS-denied environments on remote/autonomous platforms.
Tactical Hardware Integration
End-to-end execution from fundamental physics through ruggedized deployment on operational military radios (AN/PRC-163). Proven transition from lab prototypes to fielded, tactical-grade coherent systems.
Field-Validated Engineering Milestones
A record of demonstrated technological firsts — designed, engineered, and integrated into tactical systems and field hardware.
World-Record Timing Precision
Synchronization algorithms achieving 10-picosecond accuracy over dynamic wireless links. A 100x improvement over standard GPS capabilities, enabling Ka-band phase coherence and bistatic SAR coordination.
Open-Loop Beamforming Under High Velocity
World's first open-loop coherent beamformer operating on military nodes in rapid motion using only quartz oscillators.
Extreme Doppler Compensation
Feed-forward kinematic compensation extending coherent operating windows from 10ms to 160ms at relative velocities exceeding 100kph.
Custom DSL & Rapid FPGA Feedback
Domain-specific compiler collapsing physical FPGA feedback loops from days to seconds. Enabled rapid outdoor ad-hoc array deployments and the world's first open-loop phase-only distributed transmission.
AN/PRC-163 Tactical Hardening
Scaled distributed beamforming from lab prototypes to operational tactical-grade military radios. Advanced phase-alignment and timing stacks demonstrated under field conditions without sacrificing link integrity or hardware battery envelopes.
DoD & DARPA Program Execution
Over a decade executing core technical milestones, software architecture, and physical layer designs across 15+ specialized defense initiatives.
TIDAL / TSAR
DARPA10-picosecond full-duplex distributed phase alignment for Ka-band coherence. Picosecond bistatic SAR for standoff explosive hazard detection.
m-DART / DART
Army / NASAExtreme Doppler dynamics and kinematic compensation for high-velocity precision targeting. Sub-nanosecond timing resolution in collaboration with NASA test facilities.
ReACT / NESTOR
DARPAOutdoor ad-hoc array-to-array coherent transmission and retrodirective beamsteering. Custom DSL collapsing FPGA loopback from days to seconds.
CHROME / CRONUS
ArmyTime Reversal physics built into field-demonstrated, topology-agnostic retrodirective beamforming for tactical ad-hoc radios.
ODIN / ELECTRA
Navy / DoDTWTT, time-of-flight ranging, and TDoA navigation for precision indirect fire and long-range communications in adverse environments.
HORNET
DARPASub-nanosecond accuracy TWTT and Doppler correction architectures scaled for extreme relative velocity kinematics.
COBRA / CLASS
DARPAFirst practical Coherent Distributed Time Reversal array. N² gain validated in high-multipath 5.6 GHz environments at 120kph using only quartz oscillators.
eCOBRA
DoDFull coherent array stack ported to fielded AN/PRC-163 military radios. Distributed beamforming demonstrated on standard tactical hardware.
Patents & Publications
Granted United States patents and IEEE peer-reviewed publications covering distributed beamforming, Time Reversal models, and timing transfer algorithms.
| Reference | Title | Date |
|---|---|---|
| US 10,177,822 | Node Synchronization Using Time Reversal Automated physical synchronization across dynamic ad-hoc nodes via reciprocal propagation medium. | Jan 8, 2019 |
| US 9,793,969 | Array-to-Array Beamforming and Iterative Time Reversal Techniques Retrodirective modeling for coherent wave links between distant phased arrays in denied environments. | Oct 17, 2017 |
| US 2019/0028304 | Time Reversal in Wireless Communications Utilizing boundary interactions and multi-path scatter to retrodirectively compress signaling pulses. | Jan 24, 2019 |
| IEEE RWS 2016 | Collaborative Beamfocusing Radios (COBRA): A Reciprocity-Based Distributed Beamforming System Rode, J.P., Gregorian, K., Ward, J., Husain, A. — IEEE Radio and Wireless Symposium, Austin TX. | Jan 2016 |
Engage IFNDEF
Technical inquiries, system design consulting, or program collaboration. Route directly to our engineering team.