One client sent his inquiry, he needs to transmit a video signal from an IP camera over the sea for around 15-25km. He was wondering if we have any solution for this.

To realize the long-distance wireless video data transmission solution of 15~25 kilometers, especially when the transmitter and IP camera are on a moving ship, the receiver and computer are on the shore, and the transmitter and receiver are basically at the same horizontal level, there are many challenges and difficulties.

Antenna height in Ship-to-shore long-distance wireless video data transmission

Because the earth is round and its surface has a curvature, when the distance exceeds 15 सेवा मेरे 25 किलोमीटर की दूरी पर, the waves between the transmitter and the receiver can easily form obstacles to the line-of-sight transmission range, interfering to the wireless transmission of video and data.

Earth Curvature Calculation:
The minimum combined height of ship and shore antennas to overcome Earth curvature can be estimated using:

h=d²/12.75कश्मीर(मीटर में)

कश्मीर: Effective Earth radius factor (typically 4/3 to account for atmospheric refraction).
उदाहरण: के लिये 25 km transmission, the total height required is:
h=25²/12.75×1.33≈36.8 meters(combined for both ends).
इस प्रकार, ship and shore antennas should each be elevated by18–20 meters (adjust based on actual terrain).

Ship-to-shore long-distance wireless video data transmission communication for IP camera 1

Fresnel Zone Clearance:

To avoid signal blockage, सुनिश्चित करना 60% of the Fresnel Zone radius is unobstructed:

r = 8.66√(d/f)

डी: दूरी (किमी)
एफ: आवृत्ति (गीगा)
उदाहरण: के लिये 1.4 गीगाहर्ट्ज और 25 किमी, the Fresnel Zone radius is ~36 meters. Antenna height must accommodate this.

Ship-to-shore long-distance wireless video data transmission communication for IP camera 2

Through the calculation tool above, it can be deduced that if a transmission of 15 सेवा मेरे 25 kilometers is required on the shore, the height of the receiving antenna on the shore must be at least 36 मीटर की दूरी पर, which is equivalent to the height of a 10-story building. It can be set up on the top of a building or in an open area on the top of a mountain near the shore.

As long as the antenna height prerequisite is met, our wireless transmission equipment, whether it is one-way transmission or two-way transmission, can basically reach this transmission range.

We can recommend specific models based on the customer’s specific project requirements, such as the number of cameras, the amount of data, आदि.