Abstract
Search and rescue (SAR) service is one of the major services provided by BDS-3 system. Six BDS-3 MEOSAR payloads are optimally distributed on three orbits and work normally. BDS-3 system uniquely adopts the architecture of Regional Up-Link Stations and crosslinks between satellites to provide return link service (RLS) for distressed people worldwide. BDS-3 B2b signal is designed to support the return link message (RLM) broadcasting, positioning, navigation and timing. A variable-length message type of RLM is specially designed to enrich SAR operation information categories and improve SAR operation efficiency. The performance of MEOSAR, RLS and positioning is evaluated through numerical simulation and preliminary in-orbit test. According to the results, the global availability is over 98.79%, with only six BDS MEOSAR payloads. The test indexes of BDS MEOSAR payloads meet the COSPAS-SARSAT MEOSAR space segment commissioning standard requirements. BDS RLS time delay is less than 2 min, which demonstrates the efficiency of BDS RLS architecture. And B2b positioning accuracy is better than 10 m.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- BDS:
-
BeiDou Navigation Satellite System
- BOCC:
-
BDS Operation and Control Center
- CNMCC:
-
China Mission Control Center
- ELTs:
-
Emergency Locator Transmitters
- EPIRBs:
-
Emergency Position-Indicating Radio Beacons
- GMDSS:
-
Global Maritime Distress and Safety System
- LUT:
-
Local User Terminal
- MCC:
-
Mission Control Center
- MEOSAR:
-
Medium Earth Orbit Search and Rescue
- PLBs:
-
Personal Locator Beacons
- RCC:
-
Rescue Coordination Center
- RLS:
-
Return Link Service
- RLM:
-
Return Link Message
- RLSP:
-
Return Link Service provider
- RULS:
-
Regional Up-Link Station
- SAR:
-
Search and Rescue
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Li, G., Guo, S., He, Z. et al. BDS-3 SAR service and initial performance. GPS Solut 25, 134 (2021). https://doi.org/10.1007/s10291-021-01170-7
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DOI: https://doi.org/10.1007/s10291-021-01170-7