Unitree L1 Rm Lidar (Remote Measurement) (LIDAR-L1-PM-RM)

L1 Rm Lidar (Remote Measurement) Go2 Series Products (Lidar-L1-Pm-Rm) (LIDAR-L1-PM-RM)

It belongs to Unitree Robotics’ LiDAR-L1 family and is differentiated from the L1 PM (Precision Measurement) model primarily by its extended detection distance, making it especially suitable for outdoor navigation, larger indoor spaces, and longer corridor scanning.

Unitree describes the L1 series as a cost-effective and reliable “4D LiDAR” system, where “4D” refers to 3D spatial point coordinates plus grayscale/reflectivity information, enabling richer perception than geometry-only sensing. According to Unitree documentation and product pages, L1 supports common robotics perception tasks such as mapping, positioning, recognition, obstacle avoidance, environment scanning, and 3D reconstruction.

As the Remote Measurement (RM) variant, L1 RM is typically chosen when a robot must detect objects and scene structure farther ahead—for example, during outdoor patrol, campus inspection, or autonomous movement in wide, open areas—while still benefiting from the L1 platform’s signature hemispherical ultra-wide-angle field of view.

Design and Features

360° × 90° hemispherical ultra-wide perception

One of the defining design elements of the Unitree L1 RM is its hemispherical scanning geometry, specified as 360° horizontal × 90° vertical. This “hemisphere” field-of-view increases point cloud coverage and helps robots maintain situational awareness not only straight ahead, but also to the sides and upward within the vertical scan envelope—useful for detecting walls, obstacles, people, shelving, or environmental structures at varied heights.

“4D LiDAR” point cloud with reflectivity (grayscale)

Unitree frames L1 as a 4D LiDAR (3D position + 1D grayscale) system. In practice, grayscale/reflectivity attributes can improve downstream perception by helping software distinguish between different materials or surface responses—useful in navigation, object boundary detection, and scene understanding.

Remote Measurement (RM) distance profile

The key differentiator of L1 RM is its longer published scanning range compared with L1 PM. Unitree lists the RM model as achieving:

• 30 m at 90% reflectivity

• 15 m at 10% reflectivity

These specifications indicate that L1 RM is optimized for longer-range scene capture in realistic environments where reflectivity varies.

Compact size for mobile robots

Despite its range profile, L1 RM remains a compact robotics sensor designed for mobile platforms. Unitree documents the L1 sensor size at 75 × 75 × 65 mm and weight at 230 g, supporting integration into quadruped robots, wheeled robots, and compact autonomous devices where payload constraints matter.

Close-range detection and minimal blind area

Although RM emphasizes longer distance, Unitree documentation and quick-start materials also highlight that the L1 platform can detect objects as close as 0.05 m, supporting near-field obstacle avoidance and safer movement in tight spaces.

Built-in IMU for motion-aware perception

L1 sensors integrate an IMU (inertial measurement unit), commonly listed as:

• 3-axis acceleration + 3-axis gyroscope

This IMU data is important for many modern robotics pipelines—especially LiDAR-inertial odometry—because it helps correct motion distortion and improves stability during dynamic movement.

Technology and Specifications

Core ranging technology

Unitree identifies the L1 series as using Laser ToF (time-of-flight) technology, which measures distance by timing reflected laser signals.

Field of view and scan frequencies

• FOV: 360° × 90°

• Circumferential scanning frequency: 11 Hz

• Vertical scanning frequency: 180 Hz

Point cloud throughput

• Sampling frequency: 43,200 points/s

• Effective frequency: 21,600 points/s

Ranging performance (L1 RM)

• Scanning distance: 30 m (@90% reflectivity)

• Scanning distance: 15 m (@10% reflectivity)

• Nearby blind area: 0.05 m

Measurement characteristics

• Measurement accuracy: ±2.0 cm

Interface and IMU

• Communication interface: TTL UART

• IMU: 3-axis acceleration + 3-axis gyroscope

Power, safety, environment

• Power: 6 W

• Human eye safety level: Class 1 (IEC 60825)

• Operating environment: Indoor / outdoor

Applications and Use Cases

Autonomous navigation and obstacle avoidance

L1 RM is commonly used as a primary perception sensor for robots that must safely navigate dynamic environments. Its wide FOV supports detection of side obstacles, while RM’s longer range improves forward visibility for smoother path planning—especially at higher walking or driving speeds.

SLAM mapping, positioning, and localization

Unitree explicitly lists mapping and positioning among L1’s supported functions, and point clouds at 21,600 effective points/s can be sufficient for many indoor/outdoor SLAM workflows, particularly for compact robots and research-grade autonomy stacks.

Industrial inspection and facility patrol

Longer-range perception is valuable for inspection robots operating in open areas such as yards, warehouses, and industrial corridors. L1 RM can help detect upcoming structures sooner, improving route stability and enabling earlier response to obstacles or anomalies.

Robotics research and education platforms

Because it is designed for robotics integration with a straightforward interface and published performance specs, L1 RM is frequently used in development projects where teams need reliable LiDAR coverage without the cost and complexity of large multi-channel spinning LiDAR systems. Unitree positions L1 for broad fields including robotics, logistics, and smart applications.

Environment scanning and 3D reconstruction

Unitree lists environment scanning and 3D reconstruction among L1’s capabilities, and wide-angle hemispherical coverage can be useful for capturing room geometry, corridor structure, and general scene shape for digital representations.

Advantages / Benefits

Longer scanning distance for outdoor or wide-area navigation

Compared with shorter-range variants, L1 RM’s 30 m @ 90% reflectivity and 15 m @ 10% reflectivity improve forward awareness and can produce more stable behavior in open spaces and longer corridors.

Ultra-wide FOV improves overall coverage

The 360° × 90° hemispherical scan geometry supports broad perception coverage, which can reduce blind spots and improve obstacle avoidance robustness in real deployment environments.

High effective point rate for compact robotics LiDAR

An effective frequency of 21,600 points/s provides practical point density for many real-world navigation and mapping tasks while keeping the system compact and lightweight.

Built-in IMU for better motion stability

The integrated accelerometer + gyroscope supports motion-aware mapping and can improve performance in dynamic movement scenarios when used in modern LiDAR-inertial odometry pipelines.

Eye-safe Class 1 operation

Unitree lists the L1 platform as Class 1 (IEC 60825), an important requirement for robots intended to operate around people in indoor/outdoor environments.

FAQ Section

What is Unitree L1 RM LiDAR (Remote Measurement)?

Unitree L1 RM LiDAR is a compact 4D LiDAR sensor for robotics, designed for longer-range scanning with a 360° × 90° hemispherical field-of-view and reflectivity-enhanced point cloud output.

How does Unitree L1 RM LiDAR work?

It uses laser time-of-flight (ToF) ranging to generate a 3D point cloud at high speed, commonly listed at 43,200 points/s sampling and 21,600 points/s effective output, with IMU assistance for motion-aware perception.

Why is Unitree L1 RM important?

Its longer range (30 m @ 90% reflectivity) helps robots perceive farther into the environment, improving navigation stability in outdoor or wide-area spaces while remaining compact and eye-safe for real deployments.

What are the benefits of Unitree L1 RM LiDAR?

Key benefits include 360° × 90° ultra-wide coverage, 30 m remote measurement, 0.05 m near detection, 21,600 effective points/s, built-in IMU, and Class 1 eye safety for use around people.

Summary

Unitree L1 RM LiDAR (Remote Measurement) (LIDAR-L1-PM-RM) is a robotics-focused 4D LiDAR sensor designed to extend perception distance while preserving the compact size and ultra-wide coverage that define the L1 platform. With a published 360° × 90° hemispherical field-of-view, 30 m @ 90% reflectivity scanning, 0.05 m near detection, and 21,600 effective points/s output—plus integrated IMU and Class 1 eye safety—L1 RM serves as a practical sensing module for autonomous navigation, mapping, patrol robotics, and research deployments that need longer-range awareness without moving to larger industrial LiDAR stacks.