User's Manual

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MS- RA1xM Radar Module
MS-RA1xM Datasheet
1. Product Outline
MS-RA1xM radar modules are the motion sensors that detect motion and speed of objects. As Doppler
radar sensor modules, they operate in the 24 GHz ISM band.
The RA1xM series can be categorized into three product groups—MS-RA11M, MS-RA12M, and MS-
RA14M—in accordance with a number of their antennas. Table 1 introduces operating ranges of three
product groups, which are based on an RCS1 [1m²] (targeting an adult).
Table 1. Operating Ranges of Three Product Groups
Product group
Operating ranges
MS-RA11M
5 to 8 m
MS-RA12M
7 to 10 m
MS-RA14M
9 to 12 m
The range introduced in the table 1 can be adjusted by the operating environment and the gain of the
digital amplifier embedded in the module.
Since the MS-RA1xM module includes an exclusive transceiver for one-chip radars and an MCU for
32-bit signal processing, it has outstanding performance and provides various functions through digital
signal processing.
As a one-chip device, the radar IC has almost no margin of error even at a high frequency of 24 GHz
and adjusts the temperature to match the external environment with a temperature compensation circuit
embedded in the IC.
Features such as the digital amplifier, FFT signal processor, and signal comparator can be implemented
by using the embedded 32-bit Cortex M0+ MCU, and the functions including fine tuning of detection
range (50 stages), configuration of object speed (km/h), configuration of range of 2-stage proximity
detection, and prevention of error caused by vibration are supported. These features and functions are
configured and adjusted in real time via the serial communication port.
Radar modules comprised of current individual components detect motion using an analog comparator,
which is not suitable for more complex situations. The MS-RA1xM module uses digital signal processing
to achieve outstanding signal characteristics, and provides features that are completely differentiated
from that of other radar modules.
A GUI software application for PC is available to conduct performance tests when developing
applications using the MS-RA1xM module, enabling users to easily assess performance and achieve
target goals. With the PC software, users can develop their desired products more easily and rapidly
by conducting sufficient tests in the stages prior to product development.