Functional characteristics of image transmission system:
It has a strong sense of presence, a large amount of information, a means of collective decision-making for the rescue command center, image information for easy recording, non-distortion, accurate recording of instantaneous events.
The working principle of the equipment is as follows:
Digital multi-carrier wireless image transmission equipment is mainly composed of signal transmitter, signal receiver and receiving antenna. Signal transmitter consists of video image acquisition, MPEG2 image coding, COFDM coding, encryption control, control circuit, signal amplifier, mixing, high-level amplifier, filter, transmitting antenna and power supply. The signal receiver system consists of control circuit, signal amplifier, receiving antenna and power supply.
The transmitter transmits AV signal through video acquisition and coding, COFDM coding and DA conversion, and then up-conversion modulation to the designated frequency point selected by the dial switch. After high-frequency power amplification, the AV signal is transmitted by the antenna. The receiver receives the signal from the high gain antenna and sends it to the receiver for down conversion, COFDM demodulation, and MPEG2 decoding to output AV signal.
technical parameter
1) Signal transmitter
1. Image Compression Standard: MPEG2
2. Video input: PAL/NTSC
3. Frame Rate: 25 (PAL) Frame/second
4. Voice: PCM
5. Communication frequency: 330-400 MHz, 460-530 MHz, 1.0-1.4 GHz, 2.0-2.4 GHz
6. Signal Bandwidth: 8MHz
7. Transmitting power: Portable 0.5-2W optional, soldier 0.5-4W optional, vehicle 4W, 10W, 15W, 20W, 30W, 50W optional.
8. Channel Number: 4-8
9. Frequency stability: 1 ppm
10. Modulation: COFDM
11. Wireless transmission rate: greater than 4M BPS
12. Information Rate (Image Rate): More than 4M BPS
13. Error Correction Coding: Interleaved RS (250,200) Codes
14. Interface: AV Standard Q9 Connector
15. Power Supply: Portable: DC 12-24V
Soldier: DC 12V
On-board: DC 12V or 220V AC
16. Working Temperature: -20 ~+50
2) Receiver
1. RF interface: N-K (interface customizable)
2. Video interface: AV standard Q9 connector (interface customizable)
3. Video output: 1 PAL/NTSC
4. Receiving threshold: less than-100 dBm
5. Video decompression: MPEG-2, 4:2:2
6. Image quality: DVD
7. Forward Error Correction: 1/2, 2/3, 3/4, 5/6, 7/8
8. Protection interval: 1/32, 1/16, 1/8, 1/4
9. Power supply voltage: +12 DCV, or ~220V
10. Working temperature: -15-deg; C ~+60-deg; C (optional - 40-80 C)