Technology

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09 Jan 2022

PPP-RTK GNSS 校正服务 (PointPerfect)

克服 GNSS 误差,实现分米甚至厘米级实时定位。
an aerial view of a tractor in a field

Global navigation satellite systems (GNSS) have transformed our world, enabling anyone to quickly and easily pinpoint their location anywhere on the planet. High precision GNSS positioning has hit the mass market, driven by new, highly integrated GNSS receivers and, crucially, a new generation of GNSS correction services.

Today, several millions of devices stand to benefit from high precision positioning solutions that deliver accuracies down to the centimeter level, in applications ranging from unmanned service robots to automotive applications such as driving automation and lane-accurate navigation solutions to industrial and prosumer drones.

Unaided, GNSS-based positioning is subject to a variety of errors that limit achievable accuracies to several meters. These errors are caused primarily by satellite clock drift, slight deviations from the predicted orbits, or signal delays incurred in the charged ionosphere and the troposphere. GNSS correction services use a variety of techniques, delivery mechanisms, and core technologies to overcome these errors and achieve decimeter or even centimeter-level positioning accuracy.

Register today* for a 30-day free trial of PointPerfect.

全球导航卫星系统 (GNSS) 改变了我们的世界,任何人都可以利用该系统快速轻松地确定自己在地球上任何地方的位置。在新型、高度集成的 GNSS 接收机以及至关重要的新一代 GNSS 校正服务的推动下,高精度 GNSS 定位已进入大众市场。

 

如今,从无人值守服务机器人到汽车应用(包括驾驶自动化和车道精确导航解决方案),再到工业和产销无人机,数百万台设备都将受益于高精度定位解决方案,其精度可达到厘米级。



独立的、基于 GNSS 的定位会受到各类型误差的影响,而误差会将可达到的精度限制在几米以内。上述误差主要是由卫星时钟漂移、与预测轨道的轻微偏差或带电电离层和对流层中发生的信号延迟引起的。GNSS 校正服务使用各类型技术、传递机制和核心技术来克服各类型误差并实现分米甚至厘米级的定位精度。

 

实时动态 (RTK) GNSS 校正服务

传统的实时动态 (RTK) GNSS 校正服务通过观测来自一个或多个固定参考站的卫星信号来确定 GNSS 误差的大小。然后,该服务使用基于 IP 的通信将所有观测到的误差的总和传输给终端用户,该总和在距离最近基站大约 30 公里的半径范围内仍然有效。基于 RTK 的解决方案需要 GNSS 接收机和 GNSS 校正数据服务提供商之间的双向通信,并可在十到二十秒内实现厘米级的定位精度。

 

精密单点定位 (PPP) GNSS 校正服务

另外,精密单点定位 (PPP) GNSS 校正服务可通播 GNSS 误差模型,该模型在广阔的地理范围内仍然有效。因为该服务仅需要单向通信(基于 IP 或通过卫星 L-band),因此适用于任意数量的用户。传统的 PPP 高精度定位可能需要三分钟到半小时才能提供低于 10 厘米精度的位置估计,因此是勘探等静态应用的可行解决方案,但不适用于更动态的应用,包括无人机、微出行、精准农业等。

 

PPP-RTK:实时高精度

近年来,PPP-RTK GNSS 校正服务(有时也称为状态空间表示 (SSR) 校正服务)已将各类用于确定并提供 GNSS 校正数据的既定方法融于一体,实现强强组合:将接近 RTK 的精度和极短的初始化时间与 PPP 的通播特性相结合。与基于 PPP 的解决方案一样,该服务依赖于具有广泛地理有效性的 GNSS 误差模型,并使用单向通信通播不同的 GNSS 误差分量(或状态)。然后,GNSS 接收机计算其特定位置的 GNSS 校正数据。额外的统计信息可以进一步支持 GNSS 接收机使用的算法。

PPP-RTK GNSS 校正服务对终端用户的益处

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  • 支持 PPP-RTK 的 GNSS 接收机可以在几秒钟内提供亚分米定位。
  • 该服务可将单个 GNSS 校正数据流同时通播到任意数量的 GNSS 接收机。
  • 冗余 IP 和卫星通信可提高服务的可靠性和可用性。
  • 大陆级覆盖可实现不间断定位体验。 

PointPerfect 是什么?

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PointPerfect 针对多个 GNSS 星座和影响 GNSS 信号的各类大规模环境效应提供经过验证的 GNSS 校正数据,以提供可信赖的增强服务。该服务通过我们易于使用的 Thingstream 物联网服务交付平台提供,既消除了复杂性,又允许用户更有效地参与,从而缩短上市时间。该组合易于使用,支持全场景下的高精度 GNSS 定位解决方案。

 

详细信息请参阅 PointPerfect 产品摘要。 

u-blox 竞争优势

使用 SPARTN 数据格式降低传输成本

现代定位系统需要结合低带宽、高精度、可用性、可靠性以及服务提供商和终端用户之间的通信完整性。SPARTN 格式是一种行业驱动的消息传递标准,旨在满足上述要求。SPARTN 是一种将状态表示的优势与现代化通信协议基础相结合的演进,其解决方案可优化带宽,从而降低终端用户的传输成本。

 

通过 MQTT 进行高效的消息传递

通过单个连接传输多条消息时,高度可靠、轻量级的 MQTT 协议比 HTTP 高效得多。更低的开销和简化的消息传输意味着更少的数据和更低的传输成本。MQTT 协议是可扩展的:将消息通播到一百万台设备就像发送到一台设备一样容易。由于 MQTT 客户端已嵌入在许多通信产品中,因此无需集成专用或专有客户端,而这是使用 NTRIP 协议传输 GNSS 校正数据时的常见要求。

 

助力实现顺畅的业务体验

PointPerfect 通过 Thingstream 物联网服务交付平台交付,该平台是用于企业物联网服务的基于云的交付平台和管理接口。该服务通过压力测试和验证,可支持数十亿条消息的传递,其直观的界面提供了一个自助服务环境,用户可以在其中自主管理物联网设备群、管理计费、监控事件,并拥有完整的功能 API 控制。



除了传统的基于订阅的方法外,我们还提供灵活的“即用即付”服务套餐,以适应不同客户、用例和应用。Thingstream 可助力实现顺畅的业务体验,既消除了复杂性,又允许用户更有效地参与,从而缩短上市时间。该组合已成为高精度 GNSS 解决方案市场演变的转折点。

 

大陆级无缝覆盖

PointPerfect 可无缝覆盖欧洲和美国大陆区域,包括距离海岸线 12 海里(约 22 公里)以内的区域。参考网络正在不断扩大以响应市场需求。

 

99.9% 的可用性保证

PointPerfect 通过移动互联网和卫星 L-band 通信冗余交付,可提供 99.9% 的正常运行时间可用性,并以保修和专家支持为后盾。

 

顺畅集成

PointPerfect 可顺畅集成到 u-blox 全面的芯片到云端解决方案和产品集。其中包括行业领先的高精度多频段 GNSS 接收机模块、通信硬件和功能丰富的 GNSS 增强服务。u-blox 完全采用自有技术,拥有完整的控制权,并且没有外部依赖关系,确保了专业的技术支持和响应速度。



由于 PointPerfect 基于开放的 SPARTN 格式,因此其使用不限于单个硬件制造商。通过此种方式,客户可以灵活地选择硬件和服务,从而优化整体投资回报。

受益于 PointPerfect 的用例

Register today* for a 30-day free trial of PointPerfect.

*Offer applies to new Thingstream accounts only.

PointPerfect offers verified GNSS correction data for several GNSS constellations and all large-scale environmental effects that impact GNSS signals to deliver an augmentation service that can be trusted. The service is available via our easy-to-use Thingstream IoT service delivery platform, which eliminates complexities and allows users to engage more efficiently, reducing time to market. This combination lowers barriers to adoption and supports scaled-up high precision positioning solutions, even in segments where such solutions would previously have been considered impractical.

Learn more in the PointPerfect product summary.

See the different ways to evaluate F9 and PointPerfect.

u-blox differentiators

Reduced transmission costs with the SPARTN data format

Modern positioning systems require a combination of low bandwidth, high accuracy, availability, reliability, and integrity of communication between service providers and end users. The SPARTN format is an industry-driven messaging standard designed to meet these requirements. SPARTN is an evolution that combines the advantages of the state representation with modernized communication protocol fundamentals, resulting in a bandwidth-optimized solution that reduces transmitting costs for end users.

Highly efficient message delivery via MQTT

The highly reliable, lightweight MQTT protocol is vastly more efficient than HTTP when transmitting many messages on a single connection. Lower overhead and simplified messaging transport mean less data and lower transmission cost. MQTT protocol is scalable: it is as easy to broadcast a message to a million devices as it is to send to just one. Because MQTT clients are embedded in many connectivity products, there is no need to integrate a dedicated or proprietary client, which is a common requirement when the NTRIP protocol is used to stream GNSS correction data.

Frictionless for your business

PointPerfect is delivered through Thingstream IoT service delivery platform, a cloud-based delivery platform and administration interface for enterprise IoT services. Pressure tested and proven to support the delivery of billions of messages, the intuitive interface provides a self-serve environment from which users have autonomy to manage IoT device fleets, manage billing, monitor events, and have complete API control of functionality.

In addition to a traditional subscription-based approach, we offer flexible, "pay as you go" service plans tuned to address various customers, use cases, and applications. Thingstream enables a frictionless business experience, eliminating complexities and allowing users to engage more efficiently and reduce time to market. The combination serves as an inflection point in the market evolution of high precision GNSS solutions.

Homogeneous and continental coverage

PointPerfect is available with seamless coverage across the contiguous USA, Canada, Europe, South Korea, and Australia regions, including up to 12 nautical miles (22 kilometers) off coastlines. The reference network is being continuously expanded in response to market demand.

99.9% assured availability

Delivered redundantly via both mobile internet and satellite L-band communication, PointPerfect offers 99.9% uptime availability, backed by a warranty and expert support.

Seamless integration

PointPerfect integrates seamlessly into u-blox’s comprehensive silicon-to-cloud set of solutions and offerings. These include industry-leading, high precision, multi-band GNSS receiver modules, connectivity hardware, and advanced GNSS augmentation services. All technology building blocks are sourced in house, giving us full span of control without the external dependencies that can be barriers to responsiveness or call longevity into question.

Because PointPerfect is based on open SPARTN format, its use is not restricted to a single hardware manufacturer. In this way, customers have the flexibility to make hardware and services selections that optimize overall return on investment.

Use cases that benefit from PointPerfect

Robotic mowers or service robots

Robotic mowers or service robots

Robotic mowers or service robot applications create a trajectory line or fixed path for daily inspection and then follow that same precise pattern or route on recurring schedules. The low bandwidth data format offered by PointPerfect reduces transmission costs and power for budget-conscious use cases.

Unmanned vehicles

Unmanned vehicles

Unmanned vehicles such as drones require precise automated trajectories, quick convergence of location data, and accurate geo-tagging. Assignments such as delivery or dock station landing must be precise, at a specific address, and not ten meters off track from the intended target.

Driving automation

Driving automation

Driving automation is an emerging application requiring ultra-accurate and ultra-reliable location data. Vehicles with advanced driving assistance systems (ADAS) can take advantage of location attributes to take over steering, acceleration, and braking in specific scenarios.

Precision agriculture

Precision agriculture

Precision agriculture relies on high accuracy GPS technology to guide tractors, sprayers, and other agricultural vehicles using lightbars or assisted steering to improve pass-to-pass accuracy, minimizing damage to the environment. Combining this with variable rate application of agricultural inputs, farmers can save costs by reducing the volume of seeds planted as well as limit water pollution and protect arable land through the efficient use of pesticides, herbicides, and fertilizer.