DIPOL týdenní přehled - TV a SAT TV, CCTV, WLAN

Do not start a war when...

On February 26, 2011, at 6:07 Moscow time, the carrier rocket Soyuz-2.1b began to launch into earth orbit the first satellite from the third-generation Russian satellite navigation system GLONASS (Globalnaja Nawigacionnaja Sputnikowaja Sistiema).
At 9:41 the control over the satellite was taken by the ground-based command center which announced that the operation had been successfully completed. The event received wide coverage throughout the world, because after several unsuccessful attempts the Russians are closer to having an alternative to the American GPS system.

GLONASS-K satellite is the successor of the GLONASS-M series, which have so far formed the basis of the current system. The objects from the K-series are nearly two times lighter than their predecessors (750 kg instead of 1400 kg), can work three years longer (10-12 years) and transmit five navigation signals (instead of two provided by the predecessors), which will greatly increase the efficiency and accuracy of the new system. Its accuracy will improve from about 30 m to 5 m. Four signals used for military purposes will be transmitted in L1 and L2 bands, while the civil service will be available in the L3 band.

To separate individual signals, GLONASS employs FDMA (Frequency Division Multiple Access) protocols. However, two additional CDMA (Coded Division Multiple Access) signals, used by GPS, will enable users to utilize both systems. The civilians equipped with devices compatible with the two systems will be able to benefit from up to 50 satellites, in order to determine their exact positions. With different orbital height and angle of inclination, GLONASS satellites will allow for more accurate covering of polar areas, in comparison with the U.S. satellite system.

At the moment, GLONASS operates on the territory of Russia. To achieve global coverage, the system needs two more satellites. These are to be placed in the orbit later this year. The Russians, promoting the development of their system, have introduced a 25% duty on all imported GPS equipment not compatible with GLONASS. Since 2012, all cars produced in Russia are to be fitted with the GLONASS navigation system .

The launch of GLONASS-K satellite was a widely promoted event at CeBIT in Hannover. The visitors could learn in detail the possibilities and principles of operation of the system and see with their own eyes a model of the actual size of the satellite that had already been in the orbit.

Modern navigation systems are essential to the conduct of hostilities. A state which has direct control over such a system can significantly weaken the military potential of the enemy or other conflicted parties, just by turning off the system or changing its parameters.
In modern history, there were at least two cases when the U.S., controlling the GPS system, used this opportunity. During the first Gulf War they changed the GPS settings in order to show false data. The Iraqis found it out only after two days, during which they wrongly located positions of their units, and their missiles missed the targets. A similar situation occurred in 2008, during the Russo - Georgian war, whwn the GPS system was disabled in this region, hindering the movements of Russian troops. After the incident, Vladimir Putin, knowing the importance of having their own positioning system, ordered to intensify the work on the GLONASS project.

Another system, Compass - Beidou, is being built by the Chinese, it should cover China in 2012, and the whole world in 2020. Europe is also involved in a project of global navigation, Galileo, which should be be fully functional in 2018.

Antennas in an extraordinary bay.

The bay visible in the pictures below has been placed on the UNESCO World Heritage List twice. Once as an area of unique natural beauty, the second as a place of enormous research value associated with the structure of the Earth's crust.
The district with an area of 150000 ha, which consists of over 1900 islands, is inhabited only by about 300 people. Every year, the bay is visited by about 2 million tourists. To ensure communication, on some islands there have been deployed cellular base stations.
Where is the bay? - The answer at the end of this issue.

Distribution of CCTV channels as DVB-T signals in systems based on TERRA MMH-3000 headend.

Increasingly in antenna systems there are transmitted materials from media players and images from analog CCTV cameras. This functionality is often used in hotels (transmission of video from conference rooms, ski slopes, beaches) and in residential buildings (video monitoring of parking lots, playgrounds, etc).
The obstacles in implementing such systems may be lack of free channels and the prospect that in the near future televisions will not be equipped with analog TV tuners. They can be overcome by using encoders and DVB-T modulators.

The MD-330 R81713 encoder converts analog video/audio signals coming from analog cameras, video players etc. into MPEG-2 coded transport streams. The transport streams can then be fed into the TRX-360 R81709 DVB-T modulator (COFDM) and distributed in an RF network as channels in the DVB-T multiplex.

The encoder has three composite video and three stereo audio inputs. The signals from the inputs are converted into MPEG-2 TS streams available at three individual MPEG2 TS outputs. The outputs are connected (via included ribbon connectors) to the inputs of the TRX-360 R81709 DVB-T modulator (the modulator simultaneously processes signals from another encoder, so the system in the picture can distribute signals from six cameras or other audio-video devices).

Hikvision equipment ahead of the competition once again.

The Ruwi Hotel is one of the most prestigious places in the office district of Muscat, the capital of Oman. It is a favorite hotel for foreign visitors and businessmen, due to high standards of service.

To ensure the safety of the guests, Aitken Spence Hotels Group, the owner of the hotel, decided to install a video monitoring system. They have chosen Hikvision to provide engineering solution and supply of equipment .

The Ruwi Hotel is one of the most exclusive facilities of its kind in the capital of Oman

The owner and staff of the hotel required excellent image quality, particularly in areas such as parking lot, entrance, and the main lobby. The video monitoring system should cover meeting rooms, corridors, elevators and other technical facilities in the entire hotel. One of the requirements for devices operating in some areas was resistance to high temperatures.

OHI Electronics, the company doing the installation, connected the Hikvision DVRs with vandal-proof high-resolution analog cameras. The video footage is stored for over 40 days and used by the hotel staff in difficult situations, such as in the cases when customers cannot find their luggage, report damage to the car at the parking lot etc. Typical training time was greatly reduced due to the logically designed, consistent, and user-friendly interface of the Hikvision DVRs.

HIKVISION digital video recorders are known worldwide not only for their high performance, but also for superior quality and reliability. A wealth of configuration options, network interface, extensive software packages - all these features rank the manufacturer of the devices among the world leaders. Sachin Srinivasan, the head of sales at OHI Electronics, has underlined that the quality of the equipment greatly increases the efficient use of the system.

Hikvision DVRs

Video surveillance of parking lots.

For effective monitoring of unlit parking lots one requires cameras with increased sensitivity, supported by IR illuminators. The models recommended for deploying along fences are the M11190 cameras equipped with Sony Exview image senors characterized by increased sensitivity, including the range of infrared radiation emitted by IR illuminators. The cameras should be fitted with lenses designed to work in IR range, e.g. Jensen M2158.
The parking entry and exit will be efficiently monitored by the Sunell BXC5930CDN SN-M11209 cameras. They are characterized by high resolution and sensitivity, as well as excellent image processing performed by Effio processors. The use of HLC function (High Light Compensation) ensures that the images from the cameras will not be overexposed by the headlights of passing cars.

The areas of parking lots can be effectively illuminated with Redbeam IR100 M1647 (range of 90 m, beamwidth of 30^o) or Redbeam IR40 M1640 (range of 30 m, beamwidth of 60^o) IR illuminators.

Basic guidelines for effective video surveillance system in an unlit parking lot

Integration of video surveillance systems in scattered locations.

The simplest way to integrate such systems e.g. in supermarket chains, petrol/gas stations, fast food chains etc. in order to monitor the whole groups of locations in centralized points is to use local high-definition recording and lower quality remote video monitoring over the Internet in these points.

Integration of CCTV systems based on AverMedia DVRs

The video streams from IP cameras can be recorded by network DVRs AVERMEDIA M75108, M75216, M76004, M76008. They enable the users to record the video locally, as well as to perform live monitoring and video playback over the network, using the free "Remote Console" application.

Cheap home wireless n network.

A very popular wireless router is the TP-LINK TL-WR740N N3252, with the following features:

The diagram below shows a simple network based on TP-Link equipment operating in the 802.11 n standard, with Wi-Fi transmission speeds up to 150 Mb/s.

A Wi-Fi network for home and SOHO applications

DIPOL at Intertelecom 2011.

You can visit our Virtual stand - Connect to the digital world.

Vinh Ha Long.

The bay in northern Vietnam, an arm of the Gulf of Tonkin, which lies about 164 km southeast of Hanoi. As a result of flooding of the previously existing limestone plateau, the landscape is dominated by 1969 islands, of which 989 have been named. The islands in the eastern part of the bay have almost vertical slopes. The peaks of the flooded area jut out 50-100 m above the water level.

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