GB/T 14617.3-2012Propagation characteristics in land mobile service and fixed service - Part 3: Propagation characteristics of line-of-sight radio-relay communications systems (English PDF)

Foreword

GB/T 14617 "land mobile service and fixed service propagation characteristics" is divided into three parts.

--- Part 1. Propagation characteristics in land mobile service;

--- Part 2. 100MHz ~ 1000MHz fixed service propagation characteristics;

--- Part 3. sight radio relay communication system propagation characteristics.

This is Part 3 GB/T 14617 in.

Rules in this section in accordance with GB/T 1.1-2009 given draft.

This Part replaces GB/T 14617.3-1993 "land mobile service and fixed service propagation characteristics of the third part. sight radio-relay The propagation characteristics, "this part of the communication system and GB/T 14617.3-1993 compared, in addition to editorial changes outside the main technical changes are as follows.

--- Edit "Subject Matter and Scope 1" to "1" and (see Chapter 1, Chapter 1 of the 1993 edition);

--- Edit "2 reference standard" is "2 Normative references", and modify the text description, and to increase the standard required in this standard references Name (see Chapter 2, Section 2 of the 1993 edition);

--- Edit "3 The term" to "3 Terms and definitions" (see Chapter 3, Section 3 of the 1993 edition);

--- Modify 1, and modify the corresponding text description (see 421, 1993 version 4.1.2.);

--- Modify the formula (7), (8), (9), and modify the corresponding text description (see 423, 1993 edition of the 4.2.3.);

--- Modify the formula (12) (see 4241, 1993 edition of the 4.2.4.1...);

--- Modify the formula (21) and modify the corresponding text description (see 442, 1993 edition of the 4.4.2.);

--- Increase in formula (22) (see 4.4.2);

--- Increase pw%, p% defined (see 4.4.2);

--- Increase in N0, Ns, definitions 4.5.1.3 B (see 4.5.1.3);

--- Modify the formula (38), formula (39), and modify the corresponding text description (see 51, 1993 edition of the 5.1 and 5.2.1.);

--- Modify the formula (40) (see 521, 1993 version 5.2.1.);

--- Modify tables in Appendix A A.1 Notes (see Appendix A, 1993 edition of Appendix B);

--- Modify the entire contents of Appendix D (see Appendix D, 1993 edition of Appendix F);

--- Modify the entire contents E.2 in Appendix E (see Appendix E, 1993 edition of Appendix D);

--- Modify the formula (F.12) and the entire contents F.4 "(see Appendix F, 1993 edition of Appendix E);

--- Increased when used in this section refer to the preparation of 5 ITU-R standard reference.

1 Scope

This section GB/T 14617 requirements calculation circuit designs commonly used in the relevant parameters, such as the calculation of clearance and Fresnel radius, gas Calculate body absorption and rain attenuation, wave refraction, diversity reception, digital and analog microwave fading probability microwave circuit interruption prediction rate and dissemination Characteristics of the radio-meteorological data, etc., and also given where applicable range of each parameter.

The overall design of this section applies to a variety of capacity-sight radio-relay communication system and each band-of-sight radio relay communication circuits Design and various design compatible system and electromagnetic wave propagation characteristics related to.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 14617.2 land mobile service and fixed service propagation characteristics of the second part. 100 ~ 1000MHz spread fixed service characteristic

3 Terms and Definitions

The following terms and definitions apply to this document.