LiDAR and Radar Sensing in Maritime Metrology and Navigation

May 2026

Offshore and maritime operations demand millimetre-accurate positioning in environments that move constantly—waves, wind, tides, and vessel motion all conspire against stable measurement. LiDAR (Light Detection And Ranging) and radar sensors are core technologies that solve this challenge, each with distinct strengths depending on range, conditions, and resolution requirements.

What is LiDAR and how does it work?

LiDAR determines distance by firing laser pulses and measuring the time it takes for each pulse to return after reflecting off a surface—known as time-of-flight measurement. Modern maritime-grade LiDAR units emit hundreds of thousands of pulses per second, building dense 3D point clouds of surrounding structures in real time.

The result is a high-resolution spatial model that captures geometry, surface detail, and even material reflectivity—critical for structural inspection, clearance monitoring, and precise relative positioning between vessels and fixed structures.

What is the difference with radar?

Radar operates on the same time-of-flight principle but uses radio waves instead of light. This gives radar two major advantages at sea: it penetrates fog, rain, spray, and darkness without degradation, and it works reliably at ranges exceeding several kilometres. The trade-off is lower spatial resolution compared to LiDAR.

In practice, maritime metrology systems combine both: radar for long-range detection, tracking, and all-weather reliability; LiDAR for close-range precision, 3D structural mapping, and sub-centimetre accuracy.

Maritime and offshore applications

Relative positioning and approach monitoring

During heavy-lift operations, jacket installations, or float-overs, knowing the exact relative position between a vessel and a fixed structure is critical. LiDAR continuously scans the target structure, providing real-time 6-DOF (six degrees of freedom) position and orientation data that feeds into DP systems and operational decision support.

Structural inspection and as-built surveys

3D LiDAR scanning captures detailed point clouds of offshore platforms, monopiles, and subsea infrastructure during construction and maintenance. These digital records enable clash detection, deformation monitoring, and comparison against design models without requiring divers or scaffolding.

Obstacle detection and autonomous navigation

Radar and LiDAR fusion enables reliable obstacle detection for autonomous and semi-autonomous vessels. Radar provides long-range situational awareness while LiDAR adds high-resolution close-range detail—together delivering the perception layer needed for collision avoidance and path planning.

Wave and motion measurement

Specialised radar sensors (wave radars) measure sea-state parameters in real time—significant wave height, period, and direction—feeding motion forecasting systems that predict vessel motion windows for crane operations and personnel transfers.

How MimeSeas integrates LiDAR and radar

Our MetroSea platform integrates LiDAR, radar, GNSS, INS, and other metrology sensors into a unified measurement framework. Sensor fusion algorithms combine data from multiple sources to deliver robust, real-time positioning even when individual sensors are degraded by environmental conditions.

MetroSea handles the complexity of sensor calibration, coordinate frame transformations, motion compensation, and data quality monitoring—so operators get reliable position information without needing to manage individual sensor systems.

The result: precise, all-weather spatial intelligence for offshore operations—from approach monitoring to structural surveys to autonomous navigation.