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Image transmission from mobile objects

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2. Image transmission from mobile objects

Radio channel for transmitting video information consists of a mobile transmitting part (e.g., aboard the flying vehicle including a pilotless one), and receiving part (being a member of equipment based on automobile or fixed object) (see Fig.1).

Figure 1. Radio channel for transmitting video information

The transmitting part consists of:

� information source with the PAL video signal;

� information source with the PAL video signal; � compression H.261, rate 1.544 Mbps, encoding type D4(SF),

code type AMI or B8ZS, resolution CIF;

� radio modem (transmitter);

� conical helix antenna having directivity ~ 3 dB.

The receiving part consists of:

� antenna having directivity ~ 15 dB;

� radio modem (receiver);

� signal decoder;

� monitor and information storage device.

The supposed parameters of channel are shown in the Table 1:

Table 1.

Transmitter power (dBm)	Receiver sensitivity (dBm)	Frequency band (MHz)	Communication quality (BER)	Communication range (km)
27	-105	2400 - 2483	1�10^-⁶	320

In the proposed radio channel for transmitting video information using the new modem technology, the best use of technical characteristics of apparatus being produced is achieved, including increase of communication range at the given error probability level.