BPS是一个鲜为人知的GPS替代品。

BPS是一个鲜为人知的GPS替代品。
BPS is a GPS alternative that nobody's heard of

原始链接: https://www.jeffgeerling.com/blog/2025/bps-gps-alternative-nobodys-heard

在NAB展会上，我偶然发现了一个展示BPS（广播定位系统）的引人入胜的展台，这是一个潜在的地基GPS备份系统。示波器演示了GPS PPS信号和KSNV-TV电视台使用BPS进行的ATSC 3.0电视广播之间+/- 10ns的同步精度。ATSC 3.0，“下一代电视”标准，正在逐步推出，但BPS测试仅限于少数几个电视台。其意义重大：一个坚固耐用的地面时间源可以增强媒体、电网和5G对GPS漏洞（如干扰）的抵抗力。有趣的是，我还发现一块带有内置PPS输入/输出接口的消费级华硕主板，它与英特尔的Time-Aware GPIO同步，表明精确计时技术的可及性正在扩大。我对BPS很感兴趣，计划在今年晚些时候在我的YouTube频道上更深入地探讨这个话题，解释其潜在影响。

Hacker News 上关于 BPS（一种 GPS 替代方案）的讨论总结如下：一篇博文重点介绍了 BPS，这是一个实验性系统，它利用 ATSC 3.0 广播塔进行计时，并可能用于导航。目前该系统仍处于早期阶段，塔台数量有限，其愿景是建立一个独立于 GPS 的计时网状网络，提供更好的室内覆盖和抗干扰能力。该系统的可行性取决于 ATSC 3.0 的成功，而 ATSC 3.0 面临着诸多挑战，包括消费者采用率。ATSC 3.0 的部署优先级包括 DRM、个性化广告植入以及对 1080p HDR 的关注。展会现场演示使用了 eLoran 来实现完全的 GPS 独立性。评论者指出，BPS 目前仅限于计时，除非可以接收来自多个塔台的信号。

（评论） 2024-07-16

（评论） 2024-04-16

基于树莓派的DIY PTP主时钟 2025-03-28

（评论） 2024-03-25

原文

I came to the NAB (National Association of Broadcasters) show this year with my Dad to learn more about time in broadcast and live production.

I was expecting to learn more about grandmaster clocks, AV sync, timing in protocols like Dante, Livewire, AES67, and more—and I have. But then on the first day here I found this odd little corner of the building with a completely empty booth:

BPS Demo Booth - it is empty

When you see an oscilloscope that costs 3x the value of your car on a trade show floor... well, let's just say my interest was piqued.

I looked at it, and found something interesting—the trigger was on a GPS PPS timing signal output from a u-blox GPS receiver. But the 2nd channel was monitoring KSNV-TV, a US television station broadcasting an ATSC 3.0 signal.

BPS KSNV-TV vs GPS pps

The scope showed a PPS output (Pulse Per Second) demonstrating a pulse sync of +/- 10 ns between GPS and the TV signal output—which so happens to be BPS, an experimental timing standard that may be incorporated into the ATSC 3.0 rollout in the US (there are currently about 1,700 TV stations that could be upgraded).

BPS showing 10ns sync

After seeing the demo, I found out there are a few people who've heard of BPS... and many of them were presenting on it, as they were also the ones who were doing the initial rollout and experimentation.

ATSC 3.0 is a newer IP broadcast standard being rolled out in some countries—my own home city has two TV stations broadcasting it right now, under the 'NEXTGEN TV' moniker. But so far only a few TV stations are participating in the BPS testing.

Because accurate timing is critical in many areas, from media, to the power grid, to 5G and communications, having a reliable terrestrial backup to GPS—especially one that can be hardened against different types of jamming attempts—may be important to our economy, communications and power grid... or people like who just want to have a good time!

And speaking of time stuff at the NAB Show... can you guess what I'm pointing to in this photo, from the ASUS booth?

Jeff Geerling pointing to PPS in out on ASUS ProArt motherboard

If you guessed built-in PPS in/out connectors on a consumer Intel motherboard that syncs to TGPIO (Time-Aware GPIO) on an Intel CPU... you'd be right! And if you have no clue what that means, well, I'll cover it more in depth later this year :)

Anyway, I am still learning about BPS, so I'll probably go deeper into it later in my timing series on my YouTube channel, but for now, I'll leave with with a quick video showing the demo (below), and a couple links for those who want to learn more:

More resources:

BPS是一个鲜为人知的GPS替代品。 BPS is a GPS alternative that nobody's heard of

BPS是一个鲜为人知的GPS替代品。
BPS is a GPS alternative that nobody's heard of