DB/T 97-2024 in English

VALID

Specification for qualityassessment of seismic observation dataGNSS observation

Issued on:2024-03-01
Implemented on:2024-09-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $460.00
$447.00

Standard No:	DB/T 97-2024
Document status:	VALID
Title in English:	Specification for qualityassessment of seismic observation dataGNSS observation
Title in Chinese:	地震观测数据质量评价规范全球导航卫星系统观测
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2024-03-01
Implemented on:	2024-09-01
ICS Classification:	91.120.25-Seismic and vibration protection
Chinese Classification:	P15-Engineering seismic resistance
Professional Classification:	DB-Provincial Standard
Related Keywords:	seismic observation datagnss observation introduction analysis current observation key indicators data completeness rate annual evaluation evaluation standard evaluation dimensions requirements evaluation cycle
Related Topics:	data observation global quality ims global data observation navigation observation navigation New Earth View data observation Flux Observation System objective data Measure Data Relationships global satellite data observation time Fourteenth Five-Year Plan Satellite Navigation earth observation satellite Evaluation of measurement data

本文件规定了地壳形变台网全球导航卫星系统（GNSS）观测数据质量评价内容、评价指标与方法、等级评定和评价结果表述等要求。
本文件适用于地壳形变台网GNSS观测数据质量评价，其他GNSS观测数据质量评价可参考使用。

Introduction

Analysis of the core content of the standard

Evaluation dimensions	Requirements for benchmark stations	Requirements for regional stations
Evaluation frequency	Daily + annual evaluation	Evaluation after current observation
Key indicators	Data completeness rate (45% weight)	Cycle slip ratio (10% weight)
Grading	AD level 4	AD level 4

In-depth interpretation of technical points

Multipath error calculation

The standard adopts the moving window averaging method (the window length is recommended to be 300s) and calculates the F₁/F₂ frequency band error value according to the formula using the pseudorange and carrier phase data observed by the GNSS receiver. Critical threshold setting:

Gross error detection threshold: 4σ (σ=0.65m)
Seasonal change scoring standard: ≤0.05m gets full marks

Implementation and application suggestions

Data preprocessing: Must be converted to RINEX 3.05 format, and the cutoff elevation angle is uniformly set to 10°
Evaluation cycle: The preliminary evaluation of the daily data of the benchmark station should be completed within 24 hours
Problem handling: When the cycle slip ratio>15 or the effective observation<4h, the antenna installation environment must be checked immediately