SeeedStudio 101990885, User Manual

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Overview
This manual primarily describes the practical application of the radar system and
the issues that should be addressed at each stage to minimize design costs,
increase product stability, and improve project efficiency.
This manual talks about the hardware circuit reference design, the radar antenna
and shell layout requirements, and the use of a multifunctional standard UART
protocol.
The radar is a self-contained space-sensing sensor consisting of an RF antenna,
a radar chip, and a high-frequency multi-core processor. To meet the diverse
needs of users, it is built on a stable, flexible, and superior algorithmic
architecture core. It can be connected to a remote or host computer so that the
status and detection data can be sent in various ways. It also has several groups
of GPIOs that allow the user to customize the development.
1. Principle of operation
The radar transmits a 24G band millimeter-wave signal, the measured target
reflection electromagnetic wave signal, demodulates the transmitted signal, and
then obtains echo demodulation signal data through amplification, filtering, ADC,
and other processes. The echo signal's amplitude, frequency, and phase are
decoded in the MCU unit, which ultimately enables the measurement of the
target parameters (breathing, motion, tiny motions, etc.).