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24 GHz mmWave Radar Technology

How a 24 GHz radar turns an invisible threat into a warning

Four physics steps happen hundreds of times a second, with no camera and no reliance on light.

Transmit (FMCW)

A 24 GHz radio sweeps a frequency-modulated continuous-wave signal toward the road behind. Its wavelength (about 12.5 mm) scatters cleanly off metal vehicle bodies.

Reflect

Vehicle surfaces return an echo. The round-trip travel time and the frequency shift of that echo carry all the information SafeRidar needs.

Resolve

Time-of-flight sets distance. The Doppler shift sets relative speed. Array phase sets the approach angle — three physical measurements, direct and deterministic.

Respond

The processor outputs distance, speed and angle in real time and drives escalating light, sound and screen alerts.

Radar vs Camera vs Ultrasonic: Which Wins?

We benchmarked every sensing option. Radar wins on the metrics that matter for rear safety.

Metric	Camera	Ultrasonic	24 GHz mmWave Radar
Effective range	10–30 m (light-dependent)	3–5 m	150–190 m (up to 300 m automotive)
Night & Backlight	Recognition drops sharply	Unaffected	Unaffected — emits its own signal
Rain, fog, dust	Degrades or fails	Clear attenuation	Almost none — penetrates weather
Relative speed	Estimated by algorithm	Not supported	Direct via Doppler shift
Image recognition	Required (misreads & misses)	Not required	Not required — stable physics

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A Taillight Visible to 1.6 km in Daylight

220° beam and 1.6 km daylight visibility. Five light modes scale with what the radar senses — the closer the car, the more assertive the light. G-Sensor brake detection triggers an instant brake warning.

Rear Safety Is the Fastest-Growing Segment in Cycling

$166M

2025 global bicycle radar device market

$294M

Projected 2032 market size

8.6%

Compound annual growth rate

57.6%

Road-cycling share — the fastest-growing category

Safe Riding, Starting From SafeRidar

Millimeter wave radar · Intelligent warning · All-weather protection

Radar safety for riders. A brand of DASQI Technology Co., Ltd. — 24 GHz mmWave radar taillights, engineered in Shenzhen.

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Email：david.xiao@dasqi.com

Tel：+86 755 2601 3643

ShenZhen Office: 2F, Building B32, West Industrial Zone, TanTou Community, SongGang Street, Bao'an District, Shenzhen.