RU43424U1 - VIDEO AND / OR AUDIO INFORMATION RECORDING, STORAGE AND TRANSMISSION SYSTEMS FROM THE AIRCRAFT - Google Patents

Abstract

The utility model relates to a set of technical means intended for installation on board an air passenger ship for the purpose of recording, storing and transmitting the received video information via satellite and local radio channels to ground and mobile centers. A system for recording, storing and transmitting video and audio information from an aircraft, including at least one video camera installed on board the aircraft, the information from which is fed to an information recorder that records, stores in memory and sends information to the on-board monitor and a radio transmitter for transmitting information to a ground station, characterized in that a radio modem is used as a radio transmitter for receiving and transmitting a modulated radio signal using a frequency compression mode with orthogonal carriers. At the same time, a technical result is achieved, which consists in improving the quality of the transmitted information, including a large amount, while reducing the transmission speed and reducing the amount of bandwidth.

Description

The utility model relates to a set of technical means intended for installation on board an air passenger ship for the purpose of recording, storing and transmitting the received video information via satellite and local radio channels to ground and mobile centers.

A known system for monitoring the situation on board an aircraft (patent RU 2208554 C2, 07.20.2003), including video cameras and microphones installed inside the aircraft, a tape recorder connected to the on-board electric power network. Audio data transmission lines connect the tape recorder inputs with microphones and an internal wired communication network. A video monitor is installed in the cockpit and displays video signals from video cameras.

However, the use of the known system will not allow the ground services to receive real-time video information about the situation on board the aircraft during the flight and, as a result, the adoption of the most appropriate decision in the event of an emergency: the seizure of the aircraft or the threat of its capture, the actions of hooligans on board and etc.

A number of technical solutions are known aimed at eliminating this drawback. Namely, it is known that microphones and video cameras are installed on board the aircraft, which, in addition to the video monitor installed in the cockpit, are also connected to a radio signal transmitter that transmits video and audio signals to the ground

(patent DE 3327076, 01/31/1985, application WO 9906275, 02/11/1999 - the closest analogue).

A distinctive feature of the proposed system from analogs is the presence of an information transmit-receive line that uses a radio modem for transmit-receive COFDM (Orthogonal Frequency Division Multiplex - frequency multiplexing with orthogonal carriers) of the modulated radio signal. Unlike other types of modulation, COFDM mode allows you to transfer a large amount of video information (up to 16 cameras) with a speed (2 Mb / camera), sufficient to display the video signal in real time (at least 25 frames / sec) with high quality. The bandwidth of the transmitted COFDM modulated radio signal is 8 or 13 MHz. Radio modes with other types of modulation, as in well-known solutions, ceteris paribus, occupy a wider band of the working channel and have a significantly higher output power of the transmitter. When transmitting video information from an aircraft through a COFDM radio modem, the ground services receive a detailed, clear image simultaneously from all cameras installed on board the aircraft in real time.

Thus, the objective of which this utility model is aimed is to create a system for recording, storing and transmitting video and audio information from the aircraft via satellite and local radio channels to ground and mobile centers that do not contain the above disadvantages.

At the same time, a technical result is achieved, consisting in improving the quality of transmitted information, including large

volume, while reducing the transmission speed and reducing the amount of bandwidth.

The specified technical result is achieved by the proposed system for recording, storing and transmitting video and audio information from the aircraft, including installed on board the aircraft, at least one video camera and at least one microphone, the information from which is transmitted to the information recorder, which records, stores in memory and sends information to the on-board monitor and radio transmitter for transmitting information to a ground station, while a radio modem is used as a radio transmitter for receiving transmitting a modulated radio signal using the frequency compression mode with orthogonal carriers, which allows transmitting information from the aircraft to a ground point in real time.

COFDM (Orthogonal Frequency Division Multiplex - orthogonal carrier frequency division multiplexing) is distinguished by signal transmission using a large number of carrier oscillations. The carriers are orthogonal, which makes it possible to demodulate modulated oscillations even in conditions of partial overlap of the bands of individual carriers. However, the multipath propagation of a radio signal at a receiving point (quite typical for terrestrial television) leads to the weakening and even complete suppression of some carriers due to interference of direct and delayed signals. Encoding helps to solve this problem in order to detect and correct errors in the data transmission channel. The radio modem uses a combination of two types of coding - external and internal, designed to combat errors of various structures,

frequency and statistical properties, and when used together, provide almost error-free operation (this approach is also typical of other areas, for example, for digital video recording). If, thanks to the work of internal coding, the error rate at the output of the internal decoder does not exceed 10E ^-4 , then the external coding system brings the error rate at the input of the MPEG-2 demultiplexer to 10E ^-11 , which corresponds to almost error-free operation (an error occurs approximately once during hours). Coding turns OFDM into COFDM (Coded Orthogonal Frequency Division Multiplex). Coding is necessarily associated with the introduction of some redundancy into the data stream and, accordingly, with a decrease in the transfer rate of useful data; therefore, increasing the encoding power by increasing the volume of verification data does not always meet the requirements of practice. To increase the coding efficiency, without interfering with the code speed, data interleaving is used. Coding makes it possible to detect and correct errors, and interleaving increases the coding efficiency, since error packets are split into small fragments, which the coding system manages.

In a preferred embodiment of the utility model, the system may further comprise a satellite communications transmitter that transmits information from the recorder via satellite to a ground station.

The essence of the utility model is illustrated by drawings, where figure 1 shows a diagram of the side of the complex; figure 2 - diagram of the ground center; figure 3 is a diagram of a mobile center.

The complex works as follows. Video signals from video cameras (1) are transmitted to transmitters (2), which carry

coordination of the output impedance of the cameras with the input impedance of the twisted pair line. The receivers (3) compensate for the attenuation of the video signals as they pass through the twisted pair line. Next, the video signals are fed to a video recorder (4), where video data is recorded on a hard disk, and also through a video multiplexer (5) to an LCD monitor (6), which is located in the cockpit. When boarding passengers (open hatches), the DVR records video information in the following mode:

- color video cameras - 25 frames / sec;

- black and white video cameras - 5 frames / sec.

In normal flight conditions (closed hatches), color video cameras are disabled, and video information from black and white video cameras is recorded at a speed of 12 frames / sec. At the same time, the DVR operates in the "ring" mode. The monitor (6) displays the video information of the situation from the four zones of the aircraft. These can be images in front of the cabin door, a general view of the first and second salons and the sanitary-food block.

In the event of an alarm (by pressing the "alarm" button), the DVR enters sequential recording mode at a speed of 25 frames / sec (real-time mode) of video information from black and white cameras. The video image from 8 black-and-white video cameras in series via the RS232 interface of the DVR, the aviation subscriber terminal (7) of the Globalstar system satellite communication channel and a switched telephone line with a speed of 9.6 kbit / s are fed to the alarm and information display panel (9 ) the airport's ground-based security service center, where it is registered on the built-in drive and displayed on a TFT monitor. Airport Security Service via its communication channels

notifies the mobile center of an alarming situation. When approaching the ground center at a distance of up to 50 km, the radio modem (8) is turned on via the radio center (11) of the mobile center via a command from the control panel of the mobile center via the radio modem (11) of the mobile center and the local COFDM radio channel starts working. Real-time video information from all cameras through the LAN Ethernet interface (4) and the radio modem (8) is transmitted to the mobile center, where it is recorded on the built-in drive and displayed on the TFT monitor of the control panel (10). In addition, simultaneously with the transmission of video information, previously recorded data can be copied to the control panel drive. The diagrams contain links to the following nodes and devices:

1 - color or black and white camera;

2 - twisted pair video signal transmitter;

3 - twisted pair video signal receiver;

4 - video recorder;

5 - video multiplexer;

6 - on-board LCD monitor;

7 - an aviation subscriber terminal (AAT) of the Globalstar global mobile satellite communications system;

8 - radio data transmission modem;

9 - remote alarm and display information;

10 - remote control and display information;

11 - radio modem for receiving data.

Claims (3)

1. A system for recording, storing and transmitting video and / or audio information from an aircraft, including at least one video camera and / or at least one microphone mounted on board the aircraft, the information from which is transmitted to the information recorder which records, stores in memory and transmits information to the on-board monitor and radio transmitter for transmitting information to a ground station, characterized in that a radio modem using the frequency compression mode from the orthogon is used as a radio transmitter ln carriers. 2. The system according to claim 1, characterized in that the radio modem is configured to transmit an encoded signal that allows information to be transmitted from the aircraft to a ground point in real time. 3. The system according to claim 1 or 2, characterized in that it further comprises a satellite communications transmitter that transmits information from the recorder via satellite to a ground station.