Radar Core Control Board PCBA

Central Mission Computer for Radar System Orchestration, Mode Management, and Real-Time Resource Allocation

Product Overview

The Radar Core Control Board PCBA is the central processing unit of the entire radar system — the "brain" that orchestrates all subsystems, manages operational modes, and executes the radar's mission script. Built around a high-reliability multi-core processor running a real-time operating system (RTOS), the board coordinates the exciter, receiver, beam steering, signal processing, and tracking subsystems through deterministic control-plane interfaces. It maintains the radar's system state machine, transitioning between off, standby, search, acquisition, track, and calibration modes based on operator commands or autonomous threat-response logic. On-board non-volatile memory stores the mission database including terrain maps, threat libraries, and electronic order of battle (EOB) data. Dual-redundant processors with lock-step execution provide fail-operational capability for safety-critical applications. The board includes comprehensive built-in test (BIT) and fault isolation per MIL-STD-2165. Manufactured to IPC-6012DS Class 3 and qualified to MIL-STD-461 and MIL-STD-810.

Key Specifications

PCBA Assembly Challenges

Assembling a radar core control board presents unique demands due to the dual-redundant lock-step processor architecture. The two processors must have electrically identical interconnect paths to ensure cycle-accurate lock-step execution — this requires matched-length routing on all address, data, and control lines between the two processor complexes with skew held below 5 ps. The high pin-count processor BGAs (2,000+ balls each) demand precision placement and void-controlled reflow with coplanarity maintained within 0.1 mm. Multiple NVMe SSD slots require high-speed PCIe Gen4 routing with careful impedance control through connector transitions. The comprehensive BIT circuitry adds test point density that must be accommodated without compromising signal integrity. Post-assembly, 3D X-ray inspection per IPC-6012DS verifies all BGA solder joints, and thermal imaging confirms uniform heat distribution across both processor packages.

Test Strategy

Testing begins with flying-probe ICT covering all passive components and power rail verification on both redundant processor domains independently. Boundary scan validates all processor-to-peripheral and inter-processor communication paths. Lock-step verification testing intentionally injects faults into one processor domain and confirms the failover mechanism transitions within the required mission time. Functional testing loads the mission database and executes multi-hour operational scenarios, monitoring all BIT outputs per MIL-STD-2165. Environmental stress per MIL-STD-810 includes temperature-altitude testing, random vibration, and shock testing while the system runs full mission scripts. EMI/EMC per MIL-STD-461 (CE102, RE102, CS101, CS114) verifies conducted and radiated emissions compliance in both normal and degraded operational modes.

PCB Manufacturing Difficulty

Fabrication of the 18–28 layer board requires precision impedance control across multiple high-speed interfaces. The dual-processor topology demands matched-length routing between the two processor complexes, which is verified by TDR measurements on each manufactured panel. The NVMe PCIe Gen4 lanes require insertion loss below -3 dB at 8 GHz with return loss better than -15 dB. All PCBs are fabricated to IPC-6012DS Class 3 with laser-drilled microvias, backdrilled plated through-holes, 100% AOI, impedance coupon testing, and microsection analysis.

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