What is industrial millimeter wave radar that is less affected by the environment?

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Basic Analog Sensor Wireless Infineon

What is millimeter wave radar?

Millimeter waves refer to electromagnetic waves with frequencies in the range of tens of GHz to hundreds of GHz. Millimeter-wave radar is a radar that uses millimeter-wave radio waves and can detect the distance, position information, and speed of an object with high accuracy. A millimeter-wave signal generated by a synthesizer is irradiated to an object, and various information can be obtained based on the radio waves that are reflected and returned.

In our daily lives, it is used in motion detection, heartbeat/breathing detection, gesture detection, and even in automobiles.

Two Reasons to Adopt Millimeter Wave Radar

Methods for measuring distance include infrared, ultrasonic, cameras, and ToF sensors. Here, we will explain two reasons for adopting millimeter-wave radar while comparing it with millimeter-wave radar.

Reason 1 Higher accuracy than infrared and ultrasonic methods

Infrared and ultrasonic sensors are generally used as the least expensive method of measuring distance.
However, since infrared and ultrasonic systems have high signal diffusion,

low resolution
short measurement distance
Variation occurs due to environmental influences such as temperature

There are some disadvantages.

Millimeter-wave radar, which is a radio wave sensor, has high linearity and is not easily affected by the environment, so highly accurate measurement is possible. There is also the advantage that the antenna can be made smaller at 24 GHz.

Reason 2 Low cost and stable operation compared to camera and laser methods

There is also a method of adopting a camera or laser type sensor as a method of measuring distance with high accuracy. Since the camera and laser method have high straightness, high resolution and high accuracy measurement are possible.

but,

High system cost due to high performance CPU and memory requirements
It is greatly affected by the environment such as outside light, weather, and nighttime.
Complex systems such as stereo cameras and ToF sensors

There are some disadvantages.

Millimeter-wave radar is highly stable against external light, weather, nighttime, and the environment, so highly reliable measurements are possible. In addition, since the antenna can be covered with a cover by using radio wave permeability, the degree of freedom in product design is high, and the measurement range and measurement accuracy can be controlled by the radar method, frequency, and antenna design.

The advantage of millimeter-wave radar is its good balance between performance and cost.

Application example

Such millimeter-wave radar is used in a variety of applications, both indoors and outdoors.

drone
smart form
industrial robot
street lamp
Respiration/pulse sensing
speedometer
tank level meter
Automatic door
motion detection

Article header original image sample — Application example

Radar operating method

There are roughly three types of radar algorithms and operation methods, and the information that can be detected by each is different.

It can be selected according to the purpose and expanded to various applications.

Product Summary

Infineon offers a lineup of silicon germanium MMICs and millimeter wave radars for signal generation and reception that operate in the 24.0 to 26.0 GHz range so that users can select the most suitable product for their application. A high-frequency circuit can be integrated on a single chip, making it possible to measure speed, distance, and direction with high accuracy while maintaining a small size and low power consumption.

The features and specifications of each product are as follows.

	BGT24MTR11 E6327	BGT24LTR11N16	BGT24LTR22
feature	Low Phase Noise VCO with Temperature Compensation Circuit Switchable prescaler for 1.5GHz and 23kHz outputs On-chip power supply and temperature sensor, low power consumption Single-ended RF and LO terminals
feature	Standard goods	Low power consumption product	Multi-channel product (RX x 2/TX x 2)
Low noise figure NFssb	12dB	10dB	8db
high conversion gain	26dB	20dB	25dB
High 1dB input compression point	-12dBm	-28dBm	-19dBm
Package	VQFN 32pin (5.5mm x 4.5mm)	TSNP-16-9 (2.4mm x 2.4mm)	WFWLB-52-3 pin (3.63mm x 3.63mm)
Single supply voltage	3.3V	3.3V	1.5V
power consumption	500mW	300mW	500mW