Vessel Traffic Service System

Product Introduction:

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Main Application:

VTS system is composed of communication equipment, VTS radar, ship automatic identification system(AIS), closed circuit television(CCTV), hydro meteorological equipment, data processing system and so on. As the core sensing equipment of VTS, LW-R30-SH radar is a product developed in strict accordance with the requirements of the International Lighthouse Navigation Association (IALAV.128 Recommendation for VTS) for radar detection performance. The LW-R30-SH radar is capable of tracking and monitoring the position, speed, course and other parameters of the moving vessel on the surface of water. These parameters have time information of GPS or Beidou calibration. Meanwhile, the radar can also track and monitor the position of moored vessels, lighthouses and buoys, and provide basic data for VTS system.

LW-R30-SHradar can also be installed at coastal observatories or outposts to monitor all kinds of illegal activities near the coastline and to enhance the vigilance of law enforcement agencies. Illegal activities may be aimed at smuggling speedboats, illegal immigration vessels, pirate boats, illegal fishing vessels, polluting ships, and so on. This radar is the core monitoring equipment of sea-air early warning system for offshore wind farm, and is widely used in offshore wind farm.

Technical Characteristics:

Agile Configure	When LW-R30-SH radar is used as CSS radar or VTS radar, the hardware equipment is exactly the same, the difference is that different data processing application software needs to be configured. In addition, radar transceiver channels (including signal and data processing) can be configured as low-cost single-channel systems or dual-channel systems with better mission reliability.In practical applications, VTS systems are divided into basic types (information services for VTS and possible navigational assistance services) and standard types (information services, navigation assistance services and traffic organization services in areas with moderate traffic density and no major navigational hazards), enhanced types (for high traffic density and specific multi-hazard area services). According to the need of practical application,LW-R30-SH can choose different radar products with different configuration, and obtain high cost-effective ratio.
Shaped and Circularly Polarized Antenna	The radar antenna adopts low sidelobe and low cross-polarization waveguide traveling wave array antenna, and the extremely low sidelobe can restrain the azimuth false target very well, and the antenna pitch surface is designed with reciprocal cut square shape, which effectively improves the detection coverage in the near area of radar. Circular polarization improves the performance of suppression of meteorological clutter interference.
All solid state transmitter	All-solid state transmitter overcomes the problem that magnetron transmitter needs to be replaced regularly. The high reliability of solid state transmitter effectively reduces the life cycle cost of radar system. In addition, the extremely low transmitter peak power also reduces the peripheral radio interference from radar system.
All-phase participating pulse compression	The high stability receiver frequency source synchronous transmitter and receiver phase, through the pulse compression technology to compare the target echo phase change can obtain the corresponding target Doppler information. Through the MTI processing, it suppresses the environment clutter interference and analyses The target motion information. The superior pulse compression sidelobe performance can also restrain the false target in the range direction.
Frequency Diversity and Time Diversity	How to reduce the influence of sea clutter on target detection performance is an important function of VTS or CSS radar. LW-R30-SG radar transmits electromagnetic waves with different frequencies in the same beam. The reflected echo fluctuation correlation of the target is weaker than that of the target irradiated by the same frequency. The signal-to-clutter ratio of the target to sea clutter can be improved by receiving processing, so the detection performance can be improved. This method is called frequency diversity processing.The LW-R30-SG radar also emits two electromagnetic waves with different frequencies in the same region in a certain time interval, and this time interval is larger than the correlation time of the sea clutter, which makes the sea clutter relatively independent, and the correlation between the sea clutter and the sea clutter in the echo becomes weaker. However, the fluctuation characteristics of the target are almost unchanged, and the signal-to-clutter ratio of the target to sea clutter can be effectively improved by the accumulation detection. This method is called time diversity processing.
Target Detection and Tracking	Large dynamic receiver, medium-frequency high-speed sampling, pulse compression, CFAR processing, fine clutter map, pre-detection tracking, real aperture imaging and other technologies enable LW-R30-SH radar to provide clear high-resolution radar echo images. No manual radar system is required to detect and track small and large ships at different speeds at the same time.
Radar Display and Control	The radar display and control terminal has the functions of radar echo image display, target trace display, record repetition, radar equipment control, radar parameter configuration, radar fault display and so on. It provides a friendly man-machine interactive display interface.
External Interface	Radar external interface adopts standard network interface, which provides radar video, target trace, track, equipment monitoring and other information. Radar system can also provide traditional video signal interface.

Radar composition and configuration

a) Configuration of dual-channel and single-channel radar systems

LW-R30-SH radar can configure dual-channel system or single-channel system according to user's needs. The configuration of dual-channel system is illustrated in Figure 1. The dual-channel transceiver system is equipped with a set of antennas, turntables, servo control and display terminals, while transmitters, receivers, signal processing and data processing equipment are equipped with two sets. When one of the transceiver channels fails, it can automatically switch to the other channel and continue to work. This configuration has higher task reliability, but the cost of the system is also high.In the single channel radar system, the antenna, turntable, servo control, transmitter, receiver, signal processing, data processing and display and control terminals are all equipped with only one set of devices, and the system configuration diagram is shown in Figure 2. The advantage of single-channel radar is that the construction cost is relatively low and the control is relatively simple. It is suitable for applications with low requirement for data support.

Figure 1 LW-R30-SH Dual-channel Configuration

Figure 2 LW-R30-SH Single-channel Configuration

b) Radar Antenna

The standard configuration of LW-R30-SH radar is 5800mm antenna (see Fig.3). When the lower azimuth resolution or precision in practical application can also meet the requirement of application, lower cost antenna can be configured with shorter length antenna. Similarly, if the requirement for near-area coverage of radar detection is not high or the influence of rain clutter can be ignored, the components such as antenna lobe shaping and circular polarization can also be removed to reduce the cost of radar system.

c) Antenna Turntable and Servo Control Box

The antenna turntable of the LW-R30-SH radar (see figure 4 to the left) is used to drive the antenna to a 360 °rotation scan, and the transmit power generated by the radar transmitter is transmitted to the antenna through the rotating joints in the turntable. The target echo RF signal is received by the antenna and transmitted to the radar receiver by rotating joint. The turntable is also equipped with azimuth encoder, oil temperature and oil level sensor and other equipment. On the right side of figure 4 is the servo control box that controls the rotation of the antenna turntable. The servo control case can be mounted in the indoor computer room by hanging the wall. The size of the chassis is: high x wide × deep=460 x 330 x 225mm³.

Figure 3 LW-R30-SH Radar Antenna

Figure 4 LW-R30-SH Schematic Diagram of Radar Antenna turntable and Servo Control Box

d) Transceiver cabinet

The LW-R30-SH radar transceiver cabinet (see Figure 5) contains indoor feeder assemblies (waveguides, loops, couplers, etc.), transmitting power, transmitting components, receiving components, signal processing, monitoring components, ventilation units, power supply units, lightning protection, satellite timing equipment, etc. The transceiver cabinet is wall-mounted. Figure 6 shows the wall diagram of the dual-channel radar transceiver cabinet.

Figure 5 LW-R30-SH Composition Diagram of Radar Transceiver cabinets

Figure 6 LW-R30-SH Transceiver Cabinet (dual channel) Wall Diagram

e) Radar installation

LW-R30-SH radar equipment also includes signal processing data processing server, radar display and control terminal, waveguide aerator, etc.. Signal processing data processing server selects commercial server with higher main frequency and larger memory, and running clutter graph within server, MTI, constant false alarm rate, trace processing, track processing and other software. The radar display and control terminal is equipped with a commercial computer with high display resolution. It runs the target display and radar monitoring software on the computer. Data communication between server, computer, transceiver cabinet and servo control box is accomplished through LAN. In addition, according to the actual situation of the radar station, the antenna tower, lightning rod and installation, spare cabins, power distribution boxes, UPS, air conditioners should be selected. The radar installation diagram is shown in Figure 7

Figure 7 LW-R30-SH Installation Diagram

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