Radar Remote Control Board PCBA

Secure Remote-Operation Telecommand via Encrypted SATCOM, Fiber, and IPsec for Unattended Radar Sites

Product Overview

The Radar Remote Control Board PCBA enables fully unattended operation of radar systems from distant command centers via secure telecommand links. It provides the hardware interface for remote power-on/off, mode selection, parameter adjustment, and emergency shutdown of radar installations located in forward-deployed, high-altitude, or otherwise inaccessible sites. The board incorporates hardware-based encryption (AES-256) and authentication to prevent unauthorized access, with support for customer-supplied cryptographic modules via a standardized key-fill interface. Multiple communication bearers are supported — military SATCOM (UHF/VHF), fiber-optic links, IPsec VPN tunnels, and legacy serial telemetry — with automatic failover between bearers if the primary link is degraded or jammed. On-board watchdog timers and a dead-man switch logic ensure the radar returns to a safe state if communication is lost. The board operates from wide-input DC power (18–72 V) suitable for battery-backed remote sites. Fabricated to IPC-6012DS Class 3 and qualified per MIL-STD-461 and MIL-STD-810 for extreme remote deployment environments.

Key Specifications

PCBA Assembly Challenges

Assembling a remote control board for unattended sites demands extreme reliability engineering. The wide-input DC-DC converter section (18–72 V) requires high-voltage clearances per IPC-2221 with minimum 6 mm creepage for the 72 V input rail. The crypto boundary between plaintext and ciphertext domains must maintain physical separation with tamper-detection meshes that trigger zeroization if breached. The multiple communication bearer interfaces (SATCOM, fiber, Ethernet, serial) each require isolated power domains and filtered I/O to prevent conducted emissions per MIL-STD-461 CE102. The dead-man switch and watchdog circuits use discrete relay logic with fail-safe default states — loss of power or clock must force the radar to a safe shutdown condition. All critical safety circuits are assembled with redundant component paths and verified by post-assembly functional testing of every fail-safe mechanism. Conformal coating per MIL-STD-810 Method 509.7 provides protection against humidity and salt-fog in remote coastal and tropical deployments.

Test Strategy

Testing begins with ICT verifying all passives, wide-input power supply rails, and isolation barrier integrity. Security validation includes tamper detection response testing, crypto key-fill verification, and zeroization functional checks. Communication bearer testing validates all links — SATCOM modem loopback, fiber link budget, IPsec tunnel establishment, and serial telemetry framing — with automated failover testing between bearers. Watchdog and dead-man switch testing simulates communication loss and power failure scenarios to confirm safe-state transitions. Environmental stress per MIL-STD-810 includes temperature-altitude testing (Method 500.6), salt-fog exposure (Method 509.7), and solar radiation testing for desert-deployed sites. EMI/EMC per MIL-STD-461 ensures the board operates without radiating interference detectable by hostile ESM receivers.

PCB Manufacturing Difficulty

The 12–18 layer board combines high-voltage power conversion, secure crypto domains, and multiple communication interfaces on a single substrate. The wide-input DC-DC section requires heavy 3 oz copper on power planes with thermal management for the converter MOSFETs. Split-plane design maintains isolation between red/black crypto domains and between communication bearers. All PCBs are fabricated to IPC-6012DS Class 3 with HiPot isolation testing, tamper-mesh continuity verification, 100% AOI, and microsection analysis of all isolation barriers.

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