GB/T 39085.2-2020 in English
VALIDShips and marine technology—Marine radar reflectors—Part 2:Active type
- Issued on:2020-09-29
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
| Standard No: | GB/T 39085.2-2020 |
| Document status: | VALID |
| Title in English: | Ships and marine technology—Marine radar reflectors—Part 2:Active type |
| Title in Chinese: | 船舶和海上技术 船用雷达反射器 第2部分:主动型 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-09-29 |
| Implemented on: | 2021-04-01 |
| ICS Classification: | 47.020.70-Navigation and control equipment |
| Chinese Classification: | U65-Navigation equipment |
| Professional Classification: | GB-National Standard |
| Related Keywords: | marine technology marine radar reflectors
active radar reflector radar visibility requirements radar signals active type introduction analysis |
| Related Topics: | radar
radar standard initiative reflector radar boat small radar Instruments on board Radar reflectors for ships and marine technology radar reflector GB/T 39085.2 GB/T 39085.2-2020 marine radar Ship radar equipment ship radar reflector Marine radar standards |
《GB/T 39085.2-2020船舶和海上技术 船用雷达反射器 第2部分:主动型》由TC531（全国船舶电气及电子设备标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of Core Requirements of the Standard
| Technical Indicators | X-Band (9.3-9.5GHz) | S-Band (2.9-3.1GHz) |
|---|---|---|
| Minimum RCS | ≥7.5m² | ≥0.5m² |
| Coverage Angle | 280°Azimuth (Null Value≤10°) | |
| Maximum Power | ≤10W | |
Key Technical Features
The active radar reflector (RTE) achieves enhanced forwarding of radar signals through the coordinated work of the receiving antenna, amplifier and transmitting antenna. Its core advantages are:
- Polarization compatibility: supports X-band horizontal polarization and S-band circular polarization
- Time delay control: output pulse width ≤10ns or 10% of the original pulse
- Anti-saturation design: can withstand continuous irradiation of 25kW radar at 30m
Environmental adaptability requirements
According to the IEC60945 standard, the equipment must pass 7 types of rigorous tests:
- Dry heat test (55℃)
- Wet heat cycle (40℃, 95%RH)
- Vibration test (2-13.2Hz/±1mm)
- Seawater corrosion test
Application case: In the test of a certain type of RTE at an elevation angle of 10°, the X-band RCS reached 21.7m², exceeding the standard requirement by 189%
Key points of installation specifications
| Parameter | Recommended value | Limit value |
|---|---|---|
| Installation height | ≥4m(ASL) | ≥2m |
| Weight limit | 4m height corresponds to ≤5kg | |
| Compass safety distance | ≥5m or measured CSD | |
Background of Standard Evolution
This part is equivalent to ISO87292:2009, responding to the radar visibility requirements of IMOMSC.164(78) resolution for ships below 150GT. Compared with passive reflectors, active solutions have significant advantages on small fiberglass ships:
- 60% reduction in volume (≤0.05m³)
- Azimuth blind area is reduced to within 10°
- Stable performance under 20° rolling conditions
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