用於無人機中繼的雙向無線視訊資料收發器

Q: Q1: Can I use different frequencies for uplink and downlink?

A: It’s not necessary. The system uses TDD on the same frequency, alternating time slots between send and receive. FDD models support set different frequencies for uplink and downlink.

Q: Q2: What hardware do I need to add a relay function?

A: Just one extra two-way transceiver module configured as a relay node.

Q: Q3: How do I configure the time slot ratio?

A: It can be modified in firmware or configuration software — change from 1:4 to 2:3 for two-way relay mode.

Q: Q4: Will latency increase in relay mode?

A: Only slightly. The system’s OFDM frame design keeps total delay under 50ms even with one relay hop.

Q: Q5: Can multiple relays be added for extended range?

A: Yes, multi-hop relay is supported by chaining additional transceivers, though timing synchronization must be maintained.

Two-Way Wireless Video Data Transceiver for UAV Relay Applications

In modern UAV (無人機) 系統, wireless video and data transmission plays a critical role in ensuring real-time situational awareness, command control, and feedback. Traditional COFDM or TDD-based transmitters are typically used in point-to-point communication. 然而, as mission distances increase and terrain becomes complex, the need for relay transmission between drones becomes essential.

與我們的 two-way COFDM wireless video data transceiver, UAV relay can be easily implemented — without changing the base system structure. All that’s required is one additional transceiver, and by adjusting the time slot ratio from 1:4 到 2:3, full-duplex two-way relay communication can be achieved.

Key Concept: Two-Way Transmission and Time Slot Adjustment

Our COFDM-based system operates on a 時分雙工 (時分雙工) mechanism, meaning the same frequency band alternates between transmit and receive time slots.

In a traditional single-link system, 一個 1:4 time slot ratio is used — one slot for uplink (video/data from UAV to ground) and four slots for downlink control or feedback.

For UAV relay applications, we adjust the slot ratio to 2:3, enabling both drones to transmit and receive alternately within the same frequency band.

This method allows:

Drone A to send video/data to Drone B (中繼)
Drone B to forward data to the ground control station
Ground control to send command data back via Drone B to Drone A

All achieved in a synchronized, 低延遲 time slot cycle.

Technical Advantages

Simple Hardware Upgrade
You only need to add one transceiver module as a relay node. No additional frequency allocation or complicated RF synchronization is required.
低延遲, 高穩定性
Thanks to COFDM modulation and precise TDD slot control, latency remains under 50女士, even in relay operation.
Frequency Efficiency
Both UAVs share the same frequency channel, eliminating the need for multiple RF bands and minimizing interference.
Bi-Directional Transmission
Unlike one-way analog transmitters, the two-way transceiver supports simultaneous video + 數據 + 控制 傳染.
Adaptive for Various Applications
非常適合 long-range drones, relay stations, mountain terrain, maritime patrol, or emergency response where direct LOS (視線) is unavailable.

System Example

設想:
A drone flies behind a mountain ridge where direct communication with the ground station is lost.

解決方案:
Place another drone in the air to serve as a relay.

Configuration:

地面控制站 (地面站): Two-way COFDM transceiver
UAV1: Two-way transceiver (Relay Node)
UAV2: Two-way transceiver (Frontline Node)

Time Slot Setup:

Original: 1 上行鏈路 : 4 下行鏈路 (標準)
Relay Mode: 2 上行鏈路 : 3 下行鏈路 (balanced bidirectional flow)

結果:
UAV2 sends video to UAV1 → UAV1 forwards to GCS → GCS sends command → UAV1 relays back to UAV2 — all within one synchronized TDD frame.

技術參數 (例子)

範圍	描述
頻率範圍	200MHz–6GHz customizable
調製	COFDM, QPSK/16QAM/64QAM
Duplex Mode	時分雙工 (可調節的 1:4 或者 2:3 slot)
延遲	<50女士 (端到端)
影片格式	H.265/H.264 up to 1080P
資料介面	串口 / 以太網絡
傳輸距離	Up to 50km (LOS) or relay-extended
功率	10W amplifier optional for long-range
應用	UAV relay, 軍隊, rescue, 檢查

應用場景

Drone Relay for Long-Distance FPV
Emergency Communication Extension
Mountain or Forest Surveillance
Maritime and Offshore Operations
Temporary Network Relay in Field Missions

常問問題

Q1: Can I use different frequencies for uplink and downlink?

一個: It’s not necessary. The system uses TDD on the same frequency, alternating time slots between send and receive. FDD models support set different frequencies for uplink and downlink.

Q2: What hardware do I need to add a relay function?

一個: Just one extra two-way transceiver module configured as a relay node.

Q3: How do I configure the time slot ratio?

一個: It can be modified in firmware or configuration software — change from 1:4 到 2:3 for two-way relay mode.

第四季: Will latency increase in relay mode?

一個: Only slightly. The system’s OFDM frame design keeps total delay under 50ms even with one relay hop.

Q5: Can multiple relays be added for extended range?

一個: 是, multi-hop relay is supported by chaining additional transceivers, though timing synchronization must be maintained.

結論

By simply adding one more transceiver 和 adjusting the time slot ratio, UAVs can form a reliable two-way relay network that extends range, maintains low latency, and enables full bidirectional communication. This flexible design ensures mission success in complex terrains or beyond-visual-line-of-sight operations — all while keeping hardware integration simple and efficient.