APSTechnology泥浆脉冲信号解码手册：全面指南

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"《泥浆脉冲遥传信号解码手册》(MAN-11474,修订B)是APSTechnology公司于2013年发布的专著，版权属于APSTechnology Inc.。该手册涵盖了多个领域，包括研发(R&D)、生产、维修与维护以及客户服务，旨在提供关于泥浆脉冲遥传信号的深入理解和解码技术指导。文档的主要内容包括了历史修订记录，最早在2006年由S.Gillotti进行初始发布，随着后续的更新至2013年10月，文档被翻译成西班牙语、俄语和中文，并对部分内容进行了调整。主要的改动有：将文档从双相编码方法和相关器选项转换，增加了循环冗余检验(Cyclic Redundancy Check, RLL)和时间基3编码方法；增添了典型解码设置和滤波器配置、数据速率表的更新，以及SIU2配置指南。这表明手册注重实际操作的适用性和跨语言的兼容性。此外，手册还强调了版权信息，声明所有内容受2013年APSTechnology公司的全球版权保护，禁止任何形式的复制、传播、转录、存储或通过人脑或计算机系统传输。这体现了公司在知识产权保护方面的严谨态度。《泥浆脉冲遥传信号解码手册》对于从事石油钻探、地质勘探等相关行业的技术人员来说，是一份宝贵的参考资料，它详细阐述了如何解析泥浆脉冲信号，如何利用这些信号来监测钻井过程中的参数变化，优化钻井效率，以及在遇到问题时进行故障诊断和维护。理解并掌握这一技术，对于提升钻井作业的科学化和智能化具有重要意义。"

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MAN-11474 REV B

MUD PULSE TELEMETRY SIGNAL DECODING MANUAL

APS Confidential 6 of 34 APS Technology, Inc.

2.2 Timebase2 Encoding Method

The TimeBase2 is a Pulse Position Modulation Mud Pulse Telemetry encoding method which

provides a reasonable tradeoff between resolution and transmission time, and is able to tolerate

such faults as spurious pulses and missed pulses without losing synchronization. Figure 3

illustrates the TimeBase2 MPT encoding method. Each pulse encodes a four-bit value from zero

to fifteen (a "nybble"). Each pulse has its own range of time. The position of a pulse within its

range determines its numeric value. For example, in Figure 3 the leading edge of the first pulse

occurs within time slot 2, therefore the value of nybble 1 is 2. Similarly, the value of nybble 2 is

6, the value of nybble 3 is 15 ("F" in hexadecimal notation), and the value of nybble 4 is 0

Figure 3 TimeBase2 Encoding Method

Each TimeBase2 MPT transmission begins with a series of four synchronization pulses spaced

two pulse widths apart, as shown in Figure 4. This provides a unique sequence of pulses that

will not occur during the remainder of the transmission. There is an additional 5 time-slots

between words to make sure there is a minimum of 4 time-slots between pulses.

Figure 4 TimeBase2 Encoding Method Synchronization Pulses

If the SIU detects pulses that fall outside the expected locations, it will display one of the

following “Noise Level” error messages:

2.2.1 Noise Level 1

This message will be displayed if a pulse is detected in the 5-slot dead-band between

pulses. The SIU will reject this pulse and attempt to keep decoding.

Figure 5 Noise Pulse Causing a "Noise Level 1" Error

In Figure 5, pulse 9 is in the dead-band. Therefore, the SIU will reject this pulse as noise,

and display the "Noise Level 1" message. Pulses 10 and 11 should be decoded correctly.

2.2.2 Noise Level 2

A “Noise Lvl 2” will be displayed if more than one pulse is detected within the normal 16-

time-slot range of a pulse. It is impossible for the SIU to be sure which pulse is the real data

and which is the extraneous pulse. It makes an educated guess by accepting the pulse

whose timing is closer to the ideal design-center timing, and rejects the other pulse. It then

attempts to stay synchronized and keep decoding.

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APSTechnology泥浆脉冲信号解码手册：全面指南

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