STEM与日常科技·英语30篇（3）

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毫米波雷达与亚毫米级速度分辨率

Millimeter-wave radar uses frequencies between 30–300 GHz, allowing extremely fine resolution of object motion and position.
Its short wavelength enables detection of velocity differences as small as 0.1 mm/s—finer than most laser Doppler systems.
Automotive radars apply this to distinguish a cyclist’s arm movement from a stationary pole at 70 km/h.
The radar calculates speed by measuring phase shifts in reflected waves across successive pulses.
Advanced signal processing separates overlapping echoes, even when objects are less than 5 cm apart.
Unlike optical sensors, mmWave radar works reliably in fog, rain, smoke, or total darkness.
Medical versions monitor subtle chest movements to estimate respiration and heart rate without skin contact.
Resolution improves with bandwidth: modern chips offer 4 GHz bandwidth, enabling sub-millimeter accuracy.
This capability powers gesture recognition in smart home devices and fall detection for elderly care.
Understanding it reveals why autonomous vehicles rely on radar—not just cameras—for safe decision-making.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Resolution improves with bandwidth: modern chips offer 4 GHz bandwidth, enabling sub-millimeter accuracy. 分辨率随带宽提升：现代芯片支持4 GHz带宽，实现亚毫米级精度。
Understanding it reveals why autonomous vehicles rely on radar—not just cameras—for safe decision-making. 理解这一点，便知为何自动驾驶车辆依赖雷达而非仅靠摄像头做安全决策。
The radar calculates speed by measuring phase shifts in reflected waves across successive pulses. 雷达通过测量连续脉冲反射波的相位变化来计算速度。

这篇中文题目最接近哪一句？毫米波雷达与亚毫米级速度分辨率一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？毫米波雷达工作频率为30–300 GHz，可实现对物体运动与位置的极高精度分辨。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Millimeter-Wave Radar and Sub-Millimeter Velocity Resolution How to cook noodles A maths worksheet

Resolution improves with bandwidth: modern chips offer 4 GHz bandwidth, enabling sub-millimeter accuracy.

Resolution improves with bandwidth: modern chips offer 4 GHz bandwidth, enabling sub-millimeter accuracy.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Resolution improves with bandwidth: modern chips offer 4 GHz bandwidth, enabling sub-millimeter accuracy.