100км TDD двунаправленная беспроводная передача видеоданных

100km TDD bidirectional video data wireless transmission Appearance

История версий

Дата	Версия	Описание модификации
20231219	Версия 1.0	Начальная версия
20240315	V2.0	Modify the weight dimensions, modify the total data in Table MCS & чувствительность
20240405	V3.0	Add multiple sets of coexistence switches. Modify the serial-to-network configuration mode. Modify the ID number length and modify the English words of background noise detection. Added the frequency matching function

Обзор

Vcan1933-8-Watt PA is a self-developed TDD bidirectional graph integrated wireless transmission device. The product has the functions of real-time interference detection, адаптивный выбор частоты, адаптивный поток, automatic retransmission, and automatic power control, что значительно улучшает возможности защиты от многолучевого распространения и помех, и имеет характеристики высокой надежности, хорошая стабильность, и низкая задержка.

Этот продукт подходит для пожаротушения., инспекция, мониторинг, и другие сценарии,  and can transmit 100KM under good air-to-ground vision.

Product Characteristics

• Support long-distance transmission: 4M code flow can be transmitted up to 100km.
• Supports large bandwidth transmission: Up to 17Mbps@10MHz.
• Supports automatic repeater transmission: Supports automatic trunk addition.
• Supports multi-interface design: The device has two network ports and four serial ports, supporting RS232/TTL/RS422/SBUS.
• Supports automatic frequency selection: Automatic detection of interference signals, real time selection of the optimal frequency point.
• Supports automatic retransmission: Automatic retransmission of burst error data improves data reliability.
• Supports adaptive stream: The channel modulation mode is automatically adjusted according to the signal quality in real time.
• Supports automatic power control: Close range automatic adjustment of transmission power, reduce power consumption.
• Поддерживает автоматический выбор антенны: В зависимости от ситуации окклюзии, the optimal antenna transmission is selected in real time.
• Supports the coexistence of multiple set: Support up to 6 sets of equipment at the same time fixed frequency use.
• Supports the frequency matching function: Software can be used to configure the frequency and hardware key frequency.

Спецификация

Системный параметр	Технический индекс
Equipment model	Вкан1933-8W
Рабочая частота	1350~1470 МГц
Радиочастота	2Т2Р
Мощность передачи	39дБм (8-ватт ПА)
Расстояние передачи	100км (Air-to-ground LOS)
Пропускная способность канала	10МГц
режим модуляции	QPSK/16QAM
Получение чувствительности	See Table (МКС & чувствительность)
Скорость	17Mbps@16QAM3/4
Communication encryption	AES256
Задержка передачи	≤10ms
Радиочастотный интерфейс	СМА*2
Equipment interface	XT30PW-М
Equipment interface	100Mbps Ethernet*2
	TTL/RS232*2
	RS422*1
	SBUS/TTL*1
Overall power consumption	≤48W@4Mbps(Air uint)
	≤12W@1Mbps(Ground uint)
измерение(Д*Ш*В)	163*77*25мм
вес	340г
Рабочее напряжение	DC22~30V,Типичное значение: +24V@2A
Рабочая температура	-40~+75℃

МКС & чувствительность (10МГц)
No.	МКС	Total uplink and downlink throughput (Mbps)	чувствительность (дБм)
1	QPSK1/3	4.0	-99
2	QPSK1/2	5.8	-98
3	QPSK2/3	7.1	-97
4	QPSK3/4	8.2	-96
5	16QAM1/3	8.0	-96
6	16QAM1/2	11.6	-95
7	16QAM2/3	14.3	-93
8	16QAM3/4	16.4	-91

Пroduct dimension and weight

Dimension diagram

Dimension and weight

• измерение (Д*Ш*В): 163mm*77mm*25mm(including SMA 10mm)
• вес : 340г

Product interface definition

Interface diagram

The interface of the Vcan1933-8W device includes the XT30PW-M power interface and J30J-25pin data interface. The interface has RS232/TTL*2, RS422*1, SBUS/TTL*1 and 100 Mbit/s Ethernet*2.

Определение интерфейса

Интерфейс питания: XT30PW-М. Диапазон питания: DC22-30V Typical value:24V@2A

Linear order.	Имя контакта	Определение интерфейса	Описание интерфейса	Signal direction
1,2,3,4	Земля	Земля	Земля
5	422А	Serial port 3 RS-422	Receiving data RX+	я
6	422Б		Receiving data RX-	я
7	422Z		Transmitting data TX-	О
8	422Да		Transmitting data TX+	О
9	TXD_A	Serial port 1 RS232/TTL	Transmitting data TX	О
10	RXD_A		Receiving data RX	я
11	TXD_B	Serial port 2 RS232/TTL	Transmitting data TX	О
12	RXD_B		Receiving data RX	я
13	Земля		Последовательный порт 2 земля	О
14	SBUS /TTL TX	Serial port 4 SBUS/TTL	SBUS/TTL sending	О
15	SBUS /TTL RX		SBUS/TTL receiving	я
16	SBUS/TTL GND		SBUS/TTL ground	О
17	ТХ1P+	Сетевой порт 1	Transmitting data TX+	О
18	TX1M-		Transmitting data TX-	О
19	RX1P+		Receiving data RX+	я
20	RX1M-		Receiving data RX-	я
21	Земля	Земля	Последовательный порт 1 земля	О
22	TX2P+	Сетевой порт 2	Transmitting data TX+	О
23	TX2M-		Transmitting data TX-	О
24	RX2P+		Receiving data RX+	я
25	RX2M-		Receiving data RX-	я

• Примечание 1: Signal direction I indicates radio input and direction O indicates radio output.
• Примечание 2: When using the serial port 1/2 of the device, please check whether it is TTL level or RS232 level.

яndicator Meaning

The RSSI light represents the strength of the received signal
Number of RSSI energy lights on	Received energy dBm
3 RSSI lights on	about -50dBm
2 RSSI lights on	about -80dBm
1 RSSI light on	about -95dBm

Тип модуля	Режим	Vcan1933-8W light status
		PWR	SYNC	локальная сеть 1 LAN 2	РССИ 123
владелец	Un-sync	Включено	Flashing	Data sending and receiving, мигающий	Выключенный
владелец	Sync	Включено	Steady on	Data sending and receiving, мигающий	Proportional to the strength of the received signal
раб	Un-sync	Включено	Flashing	Data sending and receiving, мигающий	Идет поиск
раб	Sync	Включено	Steady on	Data sending and receiving, мигающий	Proportional to the strength of the received signal

When the master and slave devices are not synchronized, the PWR indicator of the master and slave devices is steady on, the SYNC indicator is blinking, and the RSSI indicator of the master device is off. The RSSI of the slave device will always be in the search state. After the master/slave synchronization, the SYNC indicator of the master/slave is steady on. The master-slave RSSI lamp displays the received signal energy intensity. Когда сетевой порт отправляет или получает данные, the master and slave devices correspond to LAN1, and the LAN2 indicator blinks.

More information about the product

ТДД (Дуплекс с временным разделением) is a communication technique used in wireless systems where the uplink (transmitting data from the ground control station to the drone) и нисходящая линия связи (transmitting video and data from the UAV to the ground receiver or GCS) share the same frequency channel but operate in different time slots. This allows bidirectional communication without requiring separate frequency bands for each direction.

TDD Protocol Optimization

• Ensure proper time slot allocation between uplink (sending data) и нисходящая линия связи (receiving data) for efficient bidirectional communication.
• Adaptive TDD allows dynamic allocation based on data traffic needs.
• Useful in applications where uplink and downlink traffic are asymmetric (например, video streaming).

Comparison Between TDD and FDD

Особенность	ТДД	ФЗД
Spectrum Usage	Single frequency band	Separate bands for uplink and downlink
Traffic Adaptability	Highly adaptable to asymmetric traffic	Fixed uplink/downlink ratio
Equipment Complexity	Lower cost and simpler hardware	Requires duplexers, increasing cost
Channel Reciprocity	да, supports advanced techniques like beamforming	Нет
Interference	Requires strict synchronization	Less prone to interference

TDD is widely used in modern communication systems, including those requiring long-range bidirectional video transmission due to its efficiency and flexibility.

Power and Size Constraints:

• Lightweight hardware to minimize the impact on drone flight performance.
• Low-power consumption design to maximize drone battery life.
• Compact form factor to fit within the drone’s payload.

Антенная система:

• On Drone: Fiberglass omnidirectional or small directional patch antennas.
• Ground Station: High-gain parabolic, Yagi antennas or flat panel antennas with tracking systems for long-range communication.

Приложения

1. Surveillance and Security: Real-time video streaming from drones for law enforcement or border control.
2. Вещание: High-definition aerial footage for live events or media.
3. Сельское хозяйство: Monitoring crops and livestock over vast areas.
4. Реагирование на стихийные бедствия: Sending live video from disaster sites for better coordination.

В transmission range of an 8-watt power amplifier (Пенсильвания) depends on a variety of factors, включая:

1. Частотный диапазон: Higher frequencies experience more signal loss over distance (higher free-space path loss).
2. Усиление антенны: The type and gain of the antenna at both ends (передатчик и приемник) significantly impact the range.
3. Условия окружающей среды: Factors like terrain, здания, погода (дождь, туман), и прямая видимость (LoS) can affect range.
4. Modulation Scheme and Data Rate: More complex modulation schemes (например, QAM) and higher data rates may reduce effective range due to higher sensitivity to signal degradation.
5. Чувствительность приемника: The ability of the receiver to detect a weak signal at a specific distance.