標(biāo)準解讀

GB/T 39414.5-2024 是一項中國國家標(biāo)準，全稱為《北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范 第5部分：公開服務(wù)信號B2b》。該標(biāo)準詳細規(guī)定了北斗衛(wèi)星導(dǎo)航系統(tǒng)（BDS）中針對公開服務(wù)用戶所發(fā)射的B2b信號的接口規(guī)范，確保接收設(shè)備能夠正確解碼和利用這些信號進行定位、導(dǎo)航及授時操作。以下是該標(biāo)準的主要內(nèi)容概述：

  1. 信號定義與結(jié)構(gòu)：標(biāo)準首先明確了B2b信號的頻率、調(diào)制方式以及信號組成部分，包括載波、測距碼和導(dǎo)航數(shù)據(jù)等。B2b信號作為北斗系統(tǒng)多種信號之一，工作在特定的無線電頻率上，采用先進的調(diào)制技術(shù)和擴頻碼以增強信號的抗干擾能力和多路徑效應(yīng)抵抗力。

  2. 測距碼特性：描述了B2b信號中測距碼的類型、周期、結(jié)構(gòu)和生成方法。測距碼是用于精確測量從衛(wèi)星到接收機之間距離的關(guān)鍵元素，通過其獨特的碼序列設(shè)計實現(xiàn)用戶間的碼分多址(CDMA)。

  3. 導(dǎo)航數(shù)據(jù)格式：規(guī)定了B2b信號中導(dǎo)航消息的格式、內(nèi)容及其傳輸協(xié)議。導(dǎo)航數(shù)據(jù)包含衛(wèi)星軌道參數(shù)、時間信息、系統(tǒng)健康狀態(tài)及其它輔助用戶定位的信息，確保接收機能計算出精確的位置、速度和時間。

  4. 信號性能指標(biāo)：設(shè)定了B2b信號的各項技術(shù)性能要求，如信號功率、信號對噪聲比(SNR)、碼跟蹤精度等，這些都是評估接收機解算性能的基礎(chǔ)。

  5. 兼容性與互操作性：討論了B2b信號與其他北斗信號及GPS、GLONASS等其他全球?qū)Ш叫l(wèi)星系統(tǒng)信號之間的兼容性和互操作性要求，旨在促進多系統(tǒng)接收機的開發(fā)和應(yīng)用。

  6. 接收機設(shè)計指導(dǎo)：雖然主要面向信號規(guī)范，但也可能包含對接收機設(shè)計的一般性指導(dǎo)原則，幫助制造商理解如何優(yōu)化接收算法以充分利用B2b信號特性。

  7. 測試與驗證方法：提供了一套測試B2b信號接收性能的方法和驗證接收機符合性要求的程序，確保接收設(shè)備能夠按照標(biāo)準準確處理B2b信號。


如需獲取更多詳盡信息，請直接參考下方經(jīng)官方授權(quán)發(fā)布的權(quán)威標(biāo)準文檔。

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GB/T 39414.5-2024北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范第5部分：公開服務(wù)信號B2b_第1頁
GB/T 39414.5-2024北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范第5部分：公開服務(wù)信號B2b_第2頁
GB/T 39414.5-2024北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范第5部分：公開服務(wù)信號B2b_第3頁
GB/T 39414.5-2024北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范第5部分：公開服務(wù)信號B2b_第4頁
GB/T 39414.5-2024北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范第5部分：公開服務(wù)信號B2b_第5頁

文檔簡介

ICS49.020

CCSV04

中華人民共和國國家標(biāo)準

GB/T39414.5—2024

北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范

第5部分：公開服務(wù)信號B2b

InterfacespecificationforsignalinspaceofBeiDousatellite

navigationsystem—Part5：OpenservicesignalB2b

2024?07?24發(fā)布2024?07?24實施

國家市場監(jiān)督管理總局

國家標(biāo)準化管理委員會發(fā)布

GB/T39414.5—2024

目次

前言··························································································································Ⅴ

引言··························································································································Ⅵ

1范圍·······················································································································1

2規(guī)范性引用文件········································································································1

3術(shù)語、定義和縮略語···································································································1

3.1術(shù)語和定義········································································································1

3.2縮略語··············································································································1

4北斗系統(tǒng)概述···········································································································2

4.1空間星座···········································································································2

4.2坐標(biāo)系統(tǒng)···········································································································2

4.3時間系統(tǒng)···········································································································2

5信號特性·················································································································3

5.1信號結(jié)構(gòu)···········································································································3

5.2信號調(diào)制···········································································································3

5.3邏輯電平···········································································································4

5.4極化方式···········································································································4

5.5載波相位噪聲·····································································································4

5.6雜散·················································································································4

5.7相關(guān)損耗···········································································································4

5.8數(shù)據(jù)/碼一致性····································································································4

5.9信號一致性········································································································4

5.10地面接收功率電平······························································································4

6測距碼特性··············································································································5

7導(dǎo)航電文結(jié)構(gòu)···········································································································7

7.1導(dǎo)航電文概述·····································································································7

7.1.1導(dǎo)航電文類型································································································7

7.1.2校驗碼·········································································································7

7.2B?CNAV3導(dǎo)航電文·····························································································8

7.2.1基本描述······································································································8

7.2.2編碼方案和編碼參數(shù)·······················································································8

7.2.3編排格式····································································································11

8導(dǎo)航電文參數(shù)和算法································································································14

8.1測距碼編號·······································································································14

Ⅰ

GB/T39414.5—2024

8.2信息類型··········································································································14

8.3系統(tǒng)時間參數(shù)····································································································14

8.4鐘差參數(shù)··········································································································15

8.4.1參數(shù)說明····································································································15

8.4.2用戶算法····································································································15

8.5群延遲修正參數(shù)·································································································16

8.5.1參數(shù)說明····································································································16

8.5.2用戶算法····································································································16

8.6星歷參數(shù)··········································································································16

8.6.1參數(shù)說明····································································································16

8.6.2用戶算法····································································································18

8.7電離層延遲改正模型參數(shù)·····················································································19

8.7.1參數(shù)說明····································································································19

8.7.2用戶算法····································································································19

8.8中等精度歷書····································································································24

8.8.1參數(shù)說明····································································································24

8.8.2用戶算法····································································································25

8.9簡約歷書··········································································································26

8.9.1參數(shù)說明····································································································26

8.9.2用戶算法····································································································26

8.10地球定向參數(shù)··································································································27

8.10.1參數(shù)說明···································································································27

8.10.2用戶算法···································································································27

8.11BDT?UTC時間同步參數(shù)···················································································28

8.11.1參數(shù)說明···································································································28

8.11.2用戶算法···································································································28

8.12BGTO參數(shù)·····································································································29

8.12.1參數(shù)說明···································································································29

8.12.2用戶算法···································································································29

8.13衛(wèi)星健康狀態(tài)··································································································30

8.14衛(wèi)星完好性狀態(tài)標(biāo)識·························································································30

8.15空間信號精度指數(shù)····························································································30

8.16空間信號監(jiān)測精度指數(shù)······················································································31

9符合性驗證方法······································································································31

9.1概述················································································································31

9.2信號特性驗證方法······························································································31

Ⅱ

GB/T39414.5—2024

9.2.1測試設(shè)備與連接···························································································31

9.2.2測試與判別方法···························································································31

9.3測距碼特性驗證方法···························································································31

9.3.1測試設(shè)備與連接···························································································31

9.3.2測試與判別方法···························································································31

9.4導(dǎo)航電文結(jié)構(gòu)驗證方法························································································31

9.4.1測試設(shè)備與連接···························································································31

9.4.2測試與判別方法···························································································31

9.5導(dǎo)航電文參數(shù)算法驗證方法··················································································32

9.5.1測試設(shè)備與連接···························································································32

9.5.2測試與判別方法···························································································32

附錄A（資料性）多進制LDPC編譯碼方法及示例····························································33

Ⅲ

GB/T39414.5—2024

前言

本文件按照GB/T1.1—2020《標(biāo)準化工作導(dǎo)則第1部分：標(biāo)準化文件的結(jié)構(gòu)和起草規(guī)則》的規(guī)

定起草。

本文件是GB/T39414《北斗衛(wèi)星導(dǎo)航系統(tǒng)空間信號接口規(guī)范》的第5部分。GB/T39414已經(jīng)發(fā)

布了以下部分：

——第1部分：公開服務(wù)信號B1C；

——第2部分：公開服務(wù)信號B2a；

——第3部分：公開服務(wù)信號B1I；

——第4部分：公開服務(wù)信號B3I；

——第5部分：公開服務(wù)信號B2b。

請注意本文件的某些內(nèi)容可能涉及專利。本文件的發(fā)布機構(gòu)不承擔(dān)識別專利的責(zé)任。

本文件由中央軍委裝備發(fā)展部提出。

本文件由全國北斗衛(wèi)星導(dǎo)航標(biāo)準化技術(shù)委員會（SAC/TC544）歸口。

本文件起草單位：中國衛(wèi)星導(dǎo)航工程中心、中國航天標(biāo)準化研究所、北京衛(wèi)星導(dǎo)航中心、中國空間

技術(shù)研究院、中國科學(xué)院微小衛(wèi)星創(chuàng)新研究院、華中科技大學(xué)、北京航空航天大學(xué)、中國航天電子技術(shù)

研究院。

本文件主要起草人：宿晨庚、郭樹人、高為廣、盧鋆、王維嘉、高麗峰、高揚、楊曉珩、唐祖平、黃勤、

王夢麗、陳穎、董海青、朱智勇、李罡、景貴飛、陳亮、任前義、陳正坤、呂飛仁。

Ⅴ

GB/T39414.5—2024

引言

北斗衛(wèi)星導(dǎo)航系統(tǒng)分為北斗一號、北斗二號和北斗三號三個建設(shè)發(fā)展階段。北斗衛(wèi)星導(dǎo)航系統(tǒng)目

前播發(fā)的定位導(dǎo)航授時服務(wù)公開信號包括B1I、B2I、B3I、B1C、B2a、B2b。其中，B1I、B3I信號在北斗

二號和北斗三號的中圓地球軌道（MEO）衛(wèi)星、傾斜地球同步軌道（IGSO）衛(wèi)星和地球靜止軌道（GEO）

衛(wèi)星上播發(fā)；B2I信號在北斗二號所有衛(wèi)星上播發(fā)，在北斗三號衛(wèi)星上將被B2a信號取代；B1C、B2a、

B2b信號在北斗三號中圓地球軌道（MEO）衛(wèi)星和傾斜地球同步軌道（IGSO）衛(wèi)星上播發(fā)。

B2b信號是北斗三號衛(wèi)星（GEO/IGSO/MEO）播發(fā)的下行衛(wèi)星導(dǎo)航信號，包含I支路和Q支路，

同時承載了定位導(dǎo)航授時、全球短報文通信反向鏈路、國際搜救反向鏈路等服務(wù)。GB/T39414擬由

五個部分構(gòu)成。

——第1部分：公開服務(wù)信號B1C。目的在于確立空間星座和用戶終端之間公開服務(wù)信號B1C

的信號特性、導(dǎo)航電文結(jié)構(gòu)及用戶算法等。

——第2部分：公開服務(wù)信號B2a。目的在于確立空間星座和用戶終端之間公開服務(wù)信號B2a的

信號特性、導(dǎo)航電文結(jié)構(gòu)及用戶算法等。

——第3部分：公開服務(wù)信號B1I。目的在于確立空間星座和用戶終端之間公開服務(wù)信號B1I的

信號特性、導(dǎo)航電文結(jié)構(gòu)及用戶算法等。

——第4部分：公開服務(wù)信號B3I。目的在于確立空間星座和用戶終端之間公開服務(wù)信號B3I的

信號特性、導(dǎo)航電文結(jié)構(gòu)及用戶算法等。

——第5部分：公開服務(wù)信號B2b。目的在于確立空間星座和用戶終端之間公開服務(wù)信號B2b的

信號特性、導(dǎo)航電文結(jié)構(gòu)及用戶算法等。

Ⅵ

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