MR20 77GHz mmWave Obstacle Avoidance Radar – 20 m, 120°, ROS 1/ROS 2

The MR20 is a compact 77GHz mmWave radar sensor for short-range obstacle detection and moving-target tracking on mobile robots, UGVs, AMRs and low-speed intelligent vehicles. It provides real-time target distance, direction and speed information over a 0.10–20 m detection range, supports up to 16 moving targets simultaneously, and offers ROS 1/ROS 2, Python, STM32 and Windows development resources for engineering integration.

• 77GHz millimeter-wave radar for medium- and low-speed obstacle detection
• 0.10–20 m detection range with ±0.1 m distance accuracy
• 120° azimuth beam and 120° elevation beam
• Tracks up to 16 moving targets at the same time
• Outputs target distance, direction and speed information
• Compact 40 × 40 × 24.5 mm enclosure, approximately 60 g
• TTL serial interface with optional Ethernet adapter for network-based data acquisition
• ROS 1/ROS 2 SDK, Python examples, STM32 HAL examples and Windows host software are provided

Product Overview

MR20 is a 77GHz millimeter-wave radar designed for forward obstacle sensing, relative motion measurement and short-range environment perception. The sensor transmits millimeter-wave signals and processes the reflected echoes to estimate target distance and speed, while its multi-channel antenna architecture provides directional information for detected objects.

With a 20 m maximum detection range and 120° coverage in both azimuth and elevation, the MR20 is suitable for compact robotic platforms that need a wide field of view without using a large sensor. Its 40 ms measurement cycle supports responsive obstacle detection for mobile robots and other low-speed moving systems.

Unlike optical sensors that depend strongly on ambient lighting, the radar is intended for operation in challenging environments such as rain, snow, fog and dust. The radar enclosure is rated IP67, making it suitable for outdoor and semi-outdoor robotic installations when the overall system integration is appropriately protected.

Key Features

Wide 120° Detection Coverage

The MR20 provides a 120° azimuth beam and a 120° elevation beam, allowing one compact sensor to monitor a broad area in front of a robot or vehicle. This is useful where wide-angle obstacle awareness is more important than long-range sensing.

Distance, Direction and Speed Measurement

The radar reports key motion information for detected targets, including distance, direction and speed. This data can be used by a host computer or embedded controller for obstacle detection, motion analysis, safety logic and higher-level robotic perception.

Up to 16 Moving Targets

The onboard processing algorithm can identify and track up to 16 moving targets simultaneously, making the sensor useful in scenes with multiple pedestrians, vehicles or moving objects.

Compact Form Factor for Robot Integration

At approximately 40 × 40 × 24.5 mm and 60 g, the MR20 can be mounted on small UGVs, AMRs, research robots and other space-constrained platforms. Rear cable routing and mounting holes are intended to simplify mechanical integration.

77GHz 3T4R AoP Antenna Architecture

The radar uses a three-transmit, four-receive AoP antenna architecture to support directional measurement across its wide field of view. The 77GHz operating band is widely used for compact radar sensing where accurate short-range motion detection is required.

Development Resources for PC and Embedded Systems

Development materials include ROS 1/ROS 2 SDK packages, Python 3 examples for Ubuntu and Windows, STM32 HAL example code, and Windows serial host software for parameter configuration and basic data visualization.

Technical Specifications

Applications

UGV and Mobile Robot Obstacle Detection

Use the MR20 as a forward-facing obstacle sensor on UGVs, educational robots and research platforms where compact size, wide-angle coverage and direct motion information are useful for obstacle awareness.

AMR and AGV Safety Sensing

The sensor can provide target distance and relative motion data to an onboard controller on autonomous mobile robots and automated guided vehicles operating at low or moderate speeds.

Low-Speed Vehicle Forward and Reversing Assistance

The MR20 is suitable for low-speed vehicle research, forward collision awareness and reversing assistance where a 20 m detection range and moving-target speed measurement are appropriate.

Outdoor Robotics in Rain, Fog, Snow and Dust

Millimeter-wave sensing is useful for robots that must detect nearby moving objects in environments where cameras or other optical sensors can be affected by poor visibility. The IP67-rated radar enclosure further supports outdoor integration.

Robotics Research and Sensor Integration

ROS, Python, STM32 and Windows development resources make the MR20 suitable for university laboratories, prototype vehicles and research projects that need direct access to radar target data for algorithm development and system integration.

Software & Development Support

ROS 1 and ROS 2

ROS 1 and ROS 2 SDK packages are provided for integrating radar data into robotic systems. This allows the sensor to be used as part of a ROS-based perception or obstacle-detection pipeline.

Python 3 Examples

Python 3 example code is provided for Ubuntu and Windows. The examples parse the raw radar data and output detected target information, providing a practical starting point for PC or embedded Linux development.

STM32 HAL Example Code

STM32 HAL-library example code is available for users who want to receive and parse radar data on an STM32 microcontroller through the serial interface.

Windows Host Software

Windows host software is provided for serial connection, quick testing, data visualization and radar parameter configuration.

Integration / Interfaces

TTL Serial Interface

The MR20 provides a TTL-level serial data interface. The product materials show TX, RX and GND connections, with a standard serial adapter module used to connect the radar to a host computer through a Type-C connection.

9–24 V DC Power Input

The radar uses a separate DC power input and supports a wide 9–24 V supply range, which is convenient for integration with common robotic power systems.

Optional Ethernet Adapter

An optional Ethernet conversion module is available for network-based radar data transmission. This can reduce USB port usage and is suitable for host computers with Ethernet connectivity, including NVIDIA Jetson Orin Nano and Raspberry Pi-class controllers.

What's Included

• MR20 77GHz mmWave radar sensor with integrated cable
• Standard serial adapter module

Product materials also show optional Ethernet conversion and mounting accessories. Select the required accessory configuration when ordering.

Need Help Selecting or Integrating the MR20?

Contact LucSys Robotics with your application, operating environment, host computer or controller, preferred interface, robot speed and mounting requirements. We can help you determine whether the MR20 and its available interface accessories fit your robotics or low-speed vehicle project.