GB13618-1992
Requirements of electromagnetic environment protection for air defense surveillance radar station
对空情报雷达站电磁环境防护要求
GB 13618-1992 is a current mandatory Chinese national standard for Requirements of electromagnetic environment protection for air defense surveillance radar station. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Sep 1, 1993.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
GB 13618-92 applies to air defense surveillance radar stations operating in the 80–3000 MHz frequency band. It establishes protection requirements against electromagnetic radiation from high-voltage overhead power lines, substations, electrified and non-electrified railways, automotive highways, and industrial, scientific, and medical (ISM) RF equipment. This standard is mandatory for all facilities involved in air defense radar operations within the specified frequency range. It also serves as the basis for coordination between air defense surveillance radar stations and other radio services. The standard does not apply to radar systems operating outside the 80–3000 MHz band.
Technical requirements
The standard defines interference protection criteria based on the principle that unavoidable active interference shall not cause more than a 5% loss of detection range. It specifies maximum permitted interference voltage at the radar receiver input for different types of interference, including white noise, random high-frequency pulse interference, and out-of-band AM/FM signals. Increment coefficients are provided for various interference sources such as power lines, railways, highways, and ISM equipment. The standard also addresses electromagnetic obstacles, requiring that their impact on radar detection range loss shall not exceed 5%. Additionally, it defines temporal interference limits: continuous interference shall not exceed 10 seconds, intervals between interference events shall be no less than 10 seconds, and cumulative interference time per hour shall not exceed 5% of operating time. Protection distances between radar stations and various interference sources are specified in tabular form, covering different voltage levels for power lines and substations, railway types, highway classes, and ISM equipment categories. These distances vary depending on whether the radar operates in the 80–300 MHz or 300–3000 MHz sub-band. The standard further provides calculation formulas (referenced in Appendices A–D) for determining maximum permitted interference power, interference field strength, and minimum protection distances for specific interference source types, including correction factors for different locomotive models and equipment shielding conditions.
Testing methods
The standard outlines evaluation procedures involving interference field strength measurements at the radar antenna center height and interference voltage measurements at the receiver input. Calculation methods are provided for determining field strength from various sources: AM/FM transmitters (using propagation formulas), high-voltage power lines and substations (based on voltage-level constants), electrified railways (with locomotive-type correction factors), automotive highways, and ISM RF equipment such as high-frequency welding machines and RF therapy devices. Protection distance calculations involve comparing computed interference levels against maximum permitted thresholds derived from the 5% detection range loss criterion.
FAQs
What products and facilities are regulated under GB 13618-92?
GB 13618-92 regulates air defense surveillance radar stations operating in the 80–3000 MHz band. It also applies to facilities that may cause electromagnetic interference to these radar stations, including high-voltage power lines and substations (110kV–500kV), electrified and non-electrified railways, highways, and ISM RF equipment such as high-frequency welding machines, induction furnaces, and RF therapy devices.
What is the core interference protection criterion in GB 13618-92?
The fundamental criterion is that unavoidable active interference shall not cause more than a 5% loss of radar detection range. This translates to specific maximum permitted interference voltage limits at the receiver input, which vary by interference type (white noise, pulse interference, out-of-band signals) and frequency band. Additionally, electromagnetic obstacles must not cause more than 5% detection range loss.
How are protection distances determined under GB 13618-92?
The standard provides tabulated minimum protection distances between radar antennas and various interference sources, differentiated by frequency sub-band (80–300 MHz and 300–3000 MHz). For cases not covered by the tables, calculation formulas in Appendices C and D can be used to compute interference field strength and required minimum separation distances based on source parameters, terrain conditions, and the maximum permitted interference thresholds.
The summary above provides a high-level overview of GB 13618-92. To ensure complete compliance for your radar systems or interference-generating facilities operating near air defense surveillance radar stations in China, a precise and professional translation of the full technical specifications—including all protection distance tables, interference voltage limits, and calculation formulas—is essential. Purchase our high-quality English translation of GB 13618-92 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Management
- CCS
- M50
- ICS
- 33.200
- Competent department
- Ministry of Industry and Information Technology
- Technical committee
- Ministry of Industry and Information Technology