GNSS

Comprehensive List of Wireless Communication Chip and Module Manufacturers (Including the Most Complete Wireless Communication Frequency Allocation Table)

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Comprehensive List of Wireless Communication Chip and Module Manufacturers (Including the Most Complete Wireless Communication Frequency Allocation Table)

1. 5G NR (Standard not completed, recommended to pay attention) 2. LTE/LTE-Advanced/LTE-Advanced Pro 3. WCDMA/HSPA/HSPA+ 4. TD-SCDMA 5. GSM/GPRS/EDGE/EDGE Evolution/VAMOS Note: P-GSM, standard GSM-900 frequency band; E-GSM, extended GSM-900 frequency band (including standard GSM-900 frequency band); R-GSM, railway GSM-900 frequency band (including standard and extended GSM-900 frequency bands); T-GSM, cluster wireless system-GSM; ER-GSM900, which is … Read more

How to Network Clock Synchronization?

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How to Network Clock Synchronization?

PART 1 Synchronization Is a Basic Requirement Clock synchronization is crucial for wireless networks. From 2G to 5G, different wireless access technologies have varying requirements for frequency synchronization and phase synchronization accuracy. The basic principle of synchronization is similar to that of a clock. Each base station has its own independent clock module: a crystal … Read more

Undifferenced And Uncombined PPP-RTK: Algorithm Models, Prototype Terminals And Field-Test Results

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Undifferenced And Uncombined PPP-RTK: Algorithm Models, Prototype Terminals And Field-Test Results

This content is sourced from the Journal of Geodesy, 2022, Issue 8 (Review No. GS Beijing (2022) 0490) Undifferenced And Uncombined PPP-RTK: Algorithm Models, Prototype Terminals And Field-Test Results Zhang Baocheng1, Ke Cheng1,2, Zha Jiuping1, Hou Pengyu1,2, Liu Teng1, Yuan Yunbin1, Li Zishen3 1. State Key Laboratory of Geodesy and Earth Dynamics, Institute of Precision … Read more