AN/SPS-67

The AN/SPS-67 radar system stands as a vital component in modern naval operations, offering advanced capabilities for surface search and navigation. Operating within the C-band frequency range of 5.4 to 5.8 GHz, it delivers high-resolution detection and tracking of surface targets. Its design reflects a balance between power, precision, and adaptability, making it suitable for a wide range of maritime environments.

Photo: L3Harris

With a peak power output of 280 kilowatts, the radar ensures strong signal transmission, enabling reliable detection over long distances. The system’s azimuth beamwidth of 1.5 degrees allows for focused scanning, while its elevation beamwidth varies between 12 degrees for version 1 and 31 degrees for versions 2 and 3. These specifications contribute to its ability to accurately identify and monitor targets across different altitudes and orientations.

The radar’s pulse width options—0.1, 0.25, and 1.0 microseconds—provide flexibility in range resolution, allowing operators to tailor performance based on mission requirements. Similarly, the selectable pulse repetition frequencies (PRFs) of 750, 1,200, and 2,400 Hz enable adjustments for optimal detection under varying conditions. This adaptability ensures the radar remains effective in both short-range and long-range scenarios.

Its instrumented range of 103 kilometers, equivalent to 56 nautical miles, offers extensive coverage for surface surveillance. At the same time, the minimum range of 69 meters using the shortest pulse width allows for close-in detection, which is critical during navigation in congested or restricted waters. The scan rate, adjustable between 15 and 30 revolutions per minute, supports both rapid updates and detailed observation depending on operational needs.

The AN/SPS-67 is composed of several key components that work in concert to deliver its functionality. The transmitter/receiver unit is responsible for generating and capturing radar signals, forming the core of the system’s sensing capability. The antenna, a crucial physical element, radiates and receives these signals, translating electronic pulses into actionable data.

Operator interaction is facilitated through the Radar Set Control (RSC), which provides intuitive access to radar settings and modes. The Antenna Control Unit (ACU) manages the mechanical movement of the antenna, ensuring precise alignment and consistent scanning. Meanwhile, the Radar Processor Unit (RPU) handles the complex task of processing incoming radar data, enabling real-time display and automatic tracking of targets.

One of the radar’s primary roles is surface search, which involves detecting and monitoring ships, boats, and other objects on the water’s surface. This capability is essential for safe navigation, situational awareness, and tactical decision-making in naval operations. The radar also supports navigation functions by providing accurate positional data and obstacle detection, especially in low-visibility conditions.

Beyond its core functions, the AN/SPS-67 includes a secondary capability for detecting low-flying aircraft, enhancing its utility in multi-threat environments. This feature allows naval vessels to identify potential airborne threats that may approach at low altitudes, such as helicopters or sea-skimming missiles. By integrating air and surface surveillance, the radar contributes to a more comprehensive defense posture.

Advanced versions of the radar, such as V3 and V5, incorporate automatic tracking features that significantly improve operational efficiency. These versions can automatically detect targets, determine their centroids, and track their movements without constant operator input. The resulting data is transmitted to the Combat Information Center (CIC), where it supports tactical planning and engagement decisions.

To counter electronic threats, the radar includes Electronic Countermeasure (ECM) capabilities designed to resist jamming and deception. Features like Jitter and Stagger modes introduce variability in signal timing, making it more difficult for adversaries to interfere with radar operations. These countermeasures enhance the radar’s resilience in contested environments, ensuring continued performance under electronic attack.

Reliability is further supported by the radar’s Built-In Test (BIT) functionality, which enables self-diagnosis and fault isolation. This system continuously monitors the radar’s performance and alerts operators to any malfunctions or irregularities. By simplifying maintenance and reducing downtime, BIT contributes to the radar’s overall operational readiness.