Abstract

Party and government confidential offices, defense‑related enterprises, and classified research institutions are strictly prohibited from connecting overseas navigation satellite signals to their timing systems; only the BeiDou system is permitted. DNTS-9-B The time server processes only BeiDou-3 satellite signals to provide a timing reference. 100% Domestically developed and independently controllable, eliminating risks at the source. GPS Addressing security risks such as signal hijacking and timing‑sequence leakage caused by overseas satellites, the device incorporates multi‑layered mechanisms for detecting signal spoofing, filtering electromagnetic interference, and providing encrypted time‑synchronization authentication protection, along with supporting… DNSIS Satellite‑based secure isolation devices and standalone BeiDou‑compatible handheld calibration tools together establish a comprehensive, secure time‑synchronization system for classified‑information‑handling entities, thereby meeting the security construction standards for confidential information systems.

I. Core Risk Points in Time-Synchronization Security for Classified Units

1. Backdoor Risks in Overseas Satellite Signals: Integrated into Multi-Mode Devices GPS Receivers: Foreign entities can tamper with standard time via satellite signals and steal time‑synchronization data from internal networks.

2. Satellite signal spoofing attack: An outdoor antenna receives forged satellite messages from abroad, causing time discrepancies in the internal network’s business systems and compromising the integrity of audit logs.

3. Terminal unauthorized access risk: unencrypted NTP Time‑synchronization protocol: external unauthorized terminals can access the internal network to obtain the standard reference time.

4. No isolation or protection: Satellite antenna feed lines are directly connected to equipment in the server room, allowing outdoor electromagnetic interference and malicious RF signals to propagate into the internal network servers.

II. DNTS-9-B Core Design for Independent and Controllable Single-BDS Equipment

1. Pure BeiDou hardware architecture: The entire receiver supports only BeiDou. B1I/B1C Channel 3, none GPS 、 GLONASS Foreign‑made navigation chips, with all components sourced domestically;

2. In-house development of low-level firmware: No foreign‑origin closed‑source components; the firmware comes with complete code‑audit documentation and is compatible with the acceptance criteria for classified projects.

3. Single‑constellation BeiDou signal optimization algorithm: Enhances acquisition and tracking performance in urban environments with building obstructions and indoor weak‑signal conditions, ensuring reliable satellite search.

4. Local autonomous timekeeping: Equipped with a high-precision temperature-compensated crystal oscillator, it independently outputs standard time even when satellite signals are completely blocked or lost. 72 More than an hour.

III. Comprehensive Description of the Multi-Layered Security Protection Mechanism

1. Satellite signal front-end protection: compatible DNSIS-612A Generative security isolation device: physically separates the outdoor antenna from the data center’s internal network, blocking the transmission of spoofed signals.

2. Local Signal Protection: Equipped with a built-in Beidou spoofing‑message detection algorithm that dynamically filters out non‑official Beidou satellite signals and triggers alerts and logs.

3. Time‑synchronization transmission encryption protection: NTP Service Enabled MD5 Symmetric-key encryption authentication, with only authorized internal network terminals permitted to synchronize standard time;

4. Operations and Maintenance Permission Security Protection: Devices Web Management employs a tiered account system, SSH Encrypted login; all configuration operation logs are permanently retained.

5. Comprehensive Monitoring, Auditing, and Protection: Integrated with a network-wide unified time‑synchronization monitoring platform, it continuously tracks device clock drift and satellite signal anomalies, proactively issuing alerts for suspicious activities.

IV. Complete Deployment Architecture of the BeiDou Timing System for Classified Units

1. Satellite reception layer: A dedicated BeiDou antenna is installed on the rooftop and connected to… DNSIS Generative isolation device, completely shielding against external satellite interference;

2. Reference Clock Layer: Primary/Standby Deployment in the Data Center DNTS-9-B A standalone Beidou time server with no capability to receive foreign satellites.

3. Intranet synchronization layer: Classified servers, secure terminals, and monitoring devices are encrypted. NTP Protocol synchronization reference time;

4. Calibration and testing layer: included DNHH-9-B Single‑constellation Beidou handheld time‑keeping device, specifically designed for project acceptance and annual inspections, with no foreign navigation signals.

5. Audit Monitoring Layer: All time‑synchronization devices are connected. B/S Architect a network-wide time monitoring platform that centrally stores time-series data and operational audit logs.

V. Required Qualifications and Testing Documentation for the Acceptance of Confidential Projects

1. Product Localization Statement: The original manufacturer has provided a certificate confirming the absence of overseas satellite components, a list of domestically produced chips, and an explanation of the independent development of the firmware.

2. Safety Test Report: A third-party organization has issued a specialized test report on satellite signal anti-spoofing and electromagnetic compatibility.

3. Single-Beidou function verification: Use DNHH-9-B The on-site verification device is unable to receive. GPS Wait for overseas satellite signals;

4. Log Audit Test Record: Simulate unauthorized access and signal‑spoofing scenarios to verify that the alerting and log‑retention functions are complete and effective.

VI. Typical Implementation Cases of Classified Units

The Confidentiality Bureaus of provincial Party committees, military-industrial research institutes, and classified‑information security institutions have been deployed in multiple localities. DNTS-9-B The standalone BeiDou timing system has successfully passed a specialized security review under the classified information security framework, completely eliminating potential security risks associated with foreign satellite timing. Its internal network audit logs maintain complete temporal integrity and are fully traceable, and it has operated for many years without experiencing any signal interference or security incidents involving time‑series tampering.

Conclusion

Equipped with a standalone Beidou timing hardware module and supported by a front-end security isolation, encrypted transmission, and comprehensive audit‑based protection system, this solution eliminates time‑synchronization security risks across the entire end‑to‑end chain—from the signal source to internal network terminals—making it an ideal compliant timing‑hardware selection for Party and government agencies, defense‑industry organizations, and classified‑information research institutions.