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WAAS MOPS: Practical Examples

机译：WAAS MOPS：实际示例

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The WAAS MOPS describes the method by which a Wide Area Augmentation System (WAAS) transmits its differential GPS corrections and integrity information to users in 250 bit messages. These messages must be decoded and interpreted every second. The corrections even for a single satellite are distributed across several individual messages. The corrections for individual satellites must be combined with receiver measurements and other local information to form the navigation solution and protection bounds. The user must reconstruct and apply all of this information correctly to achieve the required integrity level of 10~7.rnWhile the rules for coordinating these messages are defined in the Minimum Operational Performance Standards (MOPS), it is still helpful to provide some background, describe the intent, and show some examples. This paper provides examples of what the message order might look like and how the information should be interpreted. Both nominal and alarm situations are presented. Particular attention is paid to situations in which the user has missed some of the broadcast messages, but still has enough information to continue the procedure.rnBetter understanding the intent of the authors will further assist the user implementation of the MOPS. The MOPS is a large and fairly involved document. To new users in the process of implementing this standard, its rules may seem arbitrary. By showing how the different messages interact and work to protect integrity, the new user may more readily understand how to implement the MOPS compliant messages.
机译：WAAS MOPS描述了一种方法，广域增强系统（WAAS）通过该方法以250位消息的形式向用户发送其差分GPS校正和完整性信息。这些消息必须每秒解码和解释。甚至针对单个卫星的校正也分布在几个单独的消息中。必须将单个卫星的校正与接收机测量值和其他本地信息相结合，以形成导航解决方案和保护范围。用户必须正确地重建和应用所有这些信息，以达到10〜7的要求的完整性级别。rn尽管在最低运行性能标准（MOPS）中定义了协调这些消息的规则，但提供一些背景知识仍然有帮助，描述意图，并显示一些示例。本文提供了一些示例，说明消息顺序可能是什么样的以及应该如何解释信息。同时显示了标称和警报情况。特别要注意的是用户错过了一些广播消息，但仍然有足够的信息来继续该过程的情况。更好地了解作者的意图将进一步帮助用户实施MOP​​S。 MOPS是一个庞大且相当复杂的文档。对于正在实施此标准的新用户而言，其规则似乎是任意的。通过显示不同的消息如何交互以及如何保护完整性，新用户可以更容易地了解如何实现符合MOPS的消息。

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