Wireless monitoring signal transmission conditions
2023-10-17 13:12:07
The use of wireless monitoring products to build a wireless remote video surveillance system, there is a nearly harsh condition is that each monitoring point to the monitoring between the air unobstructed, that requires no blocking between the transmitting antenna and receiving antenna, which is the so-called line-of-sight transmission condition.
The connotation of line-of-sight transmission conditions is: where the eye can see (or something that light can penetrate), the microwave signal can be transmitted, otherwise the microwave signal cannot be transmitted.
1 The propagation characteristics of wireless video surveillance transmission system:
The wireless video transmission system has a high operating frequency, a short relative wavelength, and a poor diffraction performance. When transmitting, the sight distance condition must be satisfied. That is, there is no shelter between the receiving and transmitting antennas. When there is an obstruction, the power may be diffracted or the relay station may be set up.
2 Wireless PTZ control system propagation characteristics:
Because the control system's control subsystem works in a point-to-multipoint mode, a transmitter is required to be able to cover all monitoring points. For this reason, general wireless data transmission systems work in the high-frequency band, the frequency is relatively low, and the signal is wound. Because of its strong reflectivity and reflection ability, there is no need to satisfy the visual conditions between the transmitting antenna and the receiving antenna. That is to say, there may be a block between the wireless data transmitter and the wireless data receiver under normal circumstances.
The connotation of line-of-sight transmission conditions is: where the eye can see (or something that light can penetrate), the microwave signal can be transmitted, otherwise the microwave signal cannot be transmitted.
1 The propagation characteristics of wireless video surveillance transmission system:
The wireless video transmission system has a high operating frequency, a short relative wavelength, and a poor diffraction performance. When transmitting, the sight distance condition must be satisfied. That is, there is no shelter between the receiving and transmitting antennas. When there is an obstruction, the power may be diffracted or the relay station may be set up.
2 Wireless PTZ control system propagation characteristics:
Because the control system's control subsystem works in a point-to-multipoint mode, a transmitter is required to be able to cover all monitoring points. For this reason, general wireless data transmission systems work in the high-frequency band, the frequency is relatively low, and the signal is wound. Because of its strong reflectivity and reflection ability, there is no need to satisfy the visual conditions between the transmitting antenna and the receiving antenna. That is to say, there may be a block between the wireless data transmitter and the wireless data receiver under normal circumstances.
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