VTS Radar

VTS radar LW-R30-SH-1

 

 

Introduction to LW-R30-SH-1 radar

1. System Overview

LW-R30-SH-1 radar is a surface target surveillance radar independently developed by Anhui Outlook Technology Co., LTD. The radar adopts waveguide crack antenna, solid state emission, pulse compression, time diversity, frequency diversity, pre-detection tracking and other advanced technologies as well as sea clutter and weather clutter suppression algorithms. With superior clutter suppression and small target detection and tracking capabilities for complex sea state systems, it is the core sensing device used in vessel traffic management systems (VTS), coastal surveillance systems (CSS) or offshore wind power plant surveillance systems. The LW-R30-SH-1 radar can also be installed at coastal observation posts or outposts to monitor various types of illegal activities near the coastline, improving the vigilance capacity of law enforcement agencies.

2. Main applications

The VTS system generally consists of communication equipment, VTS radar, Automatic identification system (AIS), and closed circuit television

(CCTV), hydrometeorological equipment, VTS data processing system and other equipment. As the core sensing equipment of VTS, LW-R30-SH-1 radar is developed in strict accordance with the requirements of radar detection performance in IALAV.128 Recommendation for VTS of International Lighthouse Navigation Association. The LW-R30-SH-1 radar can track and monitor the position, speed, heading and other parameters of the surface moving ship, which are accompanied by GPS or Beidou standard calibration time information. At the same time, the radar can also track and monitor the position of anchored ships, lighthouses, buoys, and provide basic data for the VTS system.

The LW-R30-SH-1 radar can also be installed at coastal observation posts or outposts to monitor various types of illegal activities near the coastline, improving the vigilance capacity of law enforcement agencies. The targets of illegal activities may be: smuggling speedboats, illegal immigration vessels, pirate boats, illegal fishing vessels, pollution vessels, etc.

3. Technical features

3.1 Flexible Configuration

The hardware of the LW-R30-SH-1 radar used as CSS radar or VTS radar is exactly the same, the difference is that different data processing application software needs to be configured. In addition, the radar transceiver channel (including signal processing and data processing) can be configured as a low-cost single-channel system or a dual-channel system with better mission reliability.

In practical application, VTS systems are divided into basic (information services for VTS and possible navigational aid services) and standard (all types of VTS as defined by IMO) - Information services, navigation assistance services and traffic organization services in areas with moderate traffic density and no major navigational hazards), enhanced (suitable for services in high traffic density and specific multi-navigational hazards areas), three levels, LW-R30-SH-1 radar can be selected according to the actual application needs, different configuration of radar products, to obtain high cost performance.

3.2 Shaped and circularly polarized antenna design

The radar antenna is a waveguide traveling-wave array antenna with low sidelobe and low cross-polarization. The very low sidelobe can suppress the azimuth-oriented false target well. The inverted cosecant square design is adopted in the antenna pitch plane, which improves the detection coverage of radar near area effectively. The circular polarization design improves the performance of suppressing weather clutter.

3.3 All-solid-state transmitter

All-solid-state transmitters overcome the problem that magnetron transmitters need to change their magnetrons regularly. The high reliability of solid-state transmitter effectively reduces the life cycle cost of radar system and has higher economy. Addition pole

The low transmitter peak power also reduces radio interference from the radar system to the perimeter.

3.4 Full phase participation pulse compression

The highly stable receiver frequency source synchronizes the phase of the transmitter and receiver, and the Doppler information of the corresponding target can be obtained by comparing the phase change of the target echo with the pulse compression technology. The superior pulse pressure sublobe performance makes the target distance direction of the false target well suppressed.

3.5 Frequency diversity and time diversity

How to reduce the impact of sea clutter on target detection performance is an important function of VTS or CSS radar. LW-R30-SH-1 radar transmits electromagnetic waves of different frequencies in the same beam, and the fluctuation correlation of target reflection echoes obtained is weaker than that of target echoes irradiated with the same frequency. The signal-to-clutter ratio of target to sea clutter can be improved by receiving and processing. To improve the detection performance, this method is called frequency diversity processing.

LW-R30-SH-1 radar also transmits electromagnetic waves of different frequencies twice for the same area within a certain time interval, and this time interval is larger than the correlation time of sea clutter, so that sea clutter is relatively independent, and the correlation of echo sea clutter fluctuation becomes weak, while the fluctuation characteristics of the target are almost unchanged. The signal-to-clutter ratio of the target to sea clutter can be effectively improved through accumulation detection. To improve the detection performance, this method is called time diversity processing.

3.6 Target detection and tracking

Large dynamic receiver, IF high-speed sampling, pulse compression, constant false alarm processing, fine clutter, tracking before detection, real aperture imaging and other technologies enable the LW-R30-SH-1 radar to provide clear high-resolution radar echo images, and the radar system can detect and track small and large ships at different speeds at the same time without manual operation.

3.7 Radar display control

Radar display and control terminal has the functions of radar echo image display, target point track display, record replay, radar equipment control, radar parameter configuration, radar fault display and so on, providing a friendly human-computer interactive display interface.

3.8 External Ports

The radar external interface uses a standard network interface, which provides radar video, target tracking, flight path, equipment monitoring and other information. The radar system can also provide a traditional video interface.

4. Radar composition and configuration

4.1 Dual-channel and single-channel radar system configuration

LW-R30-SH-1 radar can be configured as a dual-channel system or a single-channel system according to user needs. The dual-channel system configuration is shown in Figure 1. The dual-channel transceiver system is configured with one set of antenna, turntable, servo control and display control terminal, while the transmitter, receiver, signal processing and data processing equipment are configured with two sets. When one transceiver channel fails, it can automatically switch to the other channel to continue working. This configuration has higher task reliability, but the system cost is also higher.

In the single-channel radar system, only one set of antenna, turntable, servo control, transmitter, receiver, signal processing, data processing and display control terminal are configured, and the system configuration diagram is shown in Figure 2. The advantage of single-channel radar is that the construction cost is relatively low, the control is relatively simple, and it is suitable for applications with low data protection requirements.

5. Main performance indicators of the product

The design of LW-R30-SH-1 radar's main performance indexes is strictly planned and designed according to the requirements of IALAV.128 Recommendation for VTS, and the specific indexes are shown in Table 1.

Table 1 Main performance indicators of LW-R30-SH-1 radar

Table 1 (Continued) Main performance indicators of LW-R30-SH-1 radar

 5.2 Main technical indicators of products

The main technical indicators of LW-R30-SH-1 radar are shown in Table 2.

Table 2 Main technical indicators of LW-R30-SH-1 radar

Table 2 (Continued) Main technical indicators of LW-R30-SH-1 radar