STEM与日常科技·英语30篇（7）

12 / 30

已读 0 / 30 课

GPS如何确定你的精确位置

GPS receivers calculate position by measuring signal travel time from at least four orbiting satellites simultaneously.
Each satellite transmits timestamps synchronized with atomic clocks aboard the spacecraft themselves.
Because radio signals move at known speed—nearly 300,000 km per second—distance equals time multiplied by speed.
Trilateration uses distances from multiple satellites to pinpoint latitude, longitude, and altitude uniquely.
Signal delays caused by ionosphere interference are corrected using dual-frequency receivers on modern devices.
Assisted GPS (A-GPS) downloads orbital data via cellular networks to speed up first-time location locks.
Urban canyons weaken signals, but sensor fusion combines GPS with accelerometers and gyroscopes for smoother tracking.
Galileo and GLONASS systems now supplement GPS, improving global coverage and redundancy for critical applications.
Accuracy ranges from 3–5 meters for phones to under 1 cm for survey-grade equipment using ground correction.
Behind every map pin lies precise physics, orbital mechanics, and decades of international engineering collaboration.

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

Each satellite transmits timestamps synchronized with atomic clocks aboard the spacecraft themselves. 每颗卫星都发送与自身搭载的原子钟同步的时间戳。
Trilateration uses distances from multiple satellites to pinpoint latitude, longitude, and altitude uniquely. 三边测量法利用多颗卫星的距离数据，唯一确定纬度、经度和海拔高度。
Signal delays caused by ionosphere interference are corrected using dual-frequency receivers on modern devices. 现代设备采用双频接收器，校正电离层干扰引起的信号延迟。

这篇中文题目最接近哪一句？ GPS如何确定你的精确位置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？ GPS接收器通过同时测量至少四颗在轨卫星的信号传播时间来计算位置。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） How GPS Knows Your Exact Location How to cook noodles A maths worksheet

Each satellite transmits timestamps synchronized with atomic clocks aboard the spacecraft themselves.

Each satellite transmits timestamps synchronized with atomic clocks aboard the spacecraft themselves.

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：Each satellite transmits timestamps synchronized with atomic clocks aboard the spacecraft themselves.