GB/T 35629-2017 in English

Analysis of the core content of the standard

This standard defines the basic service elements and interface specifications for indoor and outdoor multi-mode collaborative positioning, mainly including:

Key technology implementation

1. Coordinate reference system

The standard requires support for both Indoor coordinate system (ICS) and Outdoor coordinate system (OCS):

• Outdoor coordinate system: Adopts universal geographic coordinate systems such as WGS84, in line with GB/T 30170 specification
• Indoor coordinate system: Need to declare conversion parameters with outdoor coordinate system, including origin coordinates (X, Y, Z), angle between X axis and true north (angle_x), angle between Z axis and vertical line of geocentric center (angle_z)

2. Positioning quality assessment

Implemented through two data structures: AreaQualityInfo and LocationQualityInfo:

Service interface architecture

The standard defines 5 core operation interfaces:

1. GetCapabilities: Get service metadata
2. InitPositioningClient: Initialize positioning service
3. SetPositioningOption: Set positioning parameters
4. OpenPositioningSession: Start a positioning session
5. ClosePositioningSession: Close a positioning session

Interface Call Sequence

The typical calling process must follow the standardized process of metadata acquisition → service initialization → parameter setting → positioning start → result acquisition → session closing.

Implementation Suggestions

1. Technology Selection Strategy

Select a positioning technology combination based on the application scenario:

2. Exception handling mechanism

The standard defines 18 types of exception codes, focusing on preventing:

• 1007(SENSOR_ERROR): Positioning sensor failure
• 1014(MSG_BLE_NOT_ENABLED): Bluetooth is not enabled
• 1018(MSG_BLE_NO_SCAN): Bluetooth signal is lost

Standard Evolution Analysis

This standard implements for the first time:

• Establishing a conversion model for indoor and outdoor coordinate systems
• Defining a code table for 11 types of positioning technologies (Appendix A)
• Standardizing XML Schema data structure (Appendix D)

Compared with the ISO/IEC 24730-1 international standard, the new Chinese-style requirements such as multi-technology collaboration and quality assessment.