100Transmission sans fil de données vidéo bidirectionnelles km TDD

100km TDD bidirectional video data wireless transmission Appearance

Historique des versions

Date	Version	Description des modifications
20231219	V1.0	Version initiale
20240315	V2.0	Modify the weight dimensions, modify the total data  in Table MCS & Sensibilité
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

Aperçu

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, sélection de fréquence adaptative, flux adaptatif, automatic retransmission, and automatic power control, ce qui améliore considérablement la capacité d'anti-trajets multiples et d'anti-interférence, et présente les caractéristiques d'une grande fiabilité, bonne stabilité, et faible retard.

Ce produit est adapté à la lutte contre les incendies, inspection, surveillance, et d'autres scénarios,  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.
• Prend en charge la sélection automatique de l'antenne: Selon la situation d'occlusion, 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.

spécification

System parameter	Technical index
Equipment model	Vcan1933-8W
fréquence de travail	1350~1470MHz
Radiofréquence	2T2R
Puissance d'émission	39dBm (8-watt PA)
Distance de transmission	100KM (LOS air-sol)
Bande passante du canal	10MHz
Mode modulation	QPSK/16QAM
Receiving sensitivity	See Table (MCS & Sensibilité)
Speed	17Mbps@16QAM3/4
Communication encryption	AES256
Transmission delay	≤10ms
Radio frequency interface	SMA*2
Equipment interface	XT30PW-M
Equipment interface	100Mbps Ethernet*2
	TTL/RS232*2
	RS422*1
	SBUS/TTL*1
Overall power consumption	≤48W@4Mbps(Air uint)
	≤12W@1Mbps(Ground uint)
Dimension(L*L*H)	163*77*25mm
Poids	340g
Tension de fonctionnement	DC22~30V,Valeur typique: +24V@2A
Température de travail	-40~+75℃

MCS & Sensibilité (10MHz)
No.	MCS	Total uplink and downlink  throughput (Mbit/s)	Sensibilité (dBm)
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

Product dimension and weight

Dimension diagram

Dimension and weight

• Dimension (L*L*H): 163mm*77mm*25mm(including SMA 10mm)
• Poids : 340g

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.

Définition de l'interface

Interface d'alimentation: XT30PW-M. Plage d'alimentation: DC22-30V Typical value:24V@2A 

Linear  order.	Nom de la broche	Définition de l'interface	Description de l'interface	Signal  direction
1,2,3,4	GND	Sol	Sol
5	422UN	Serial port 3 RS-422	Receiving data RX+	je
6	422B		Receiving data RX-	je
7	422Z		Transmitting data TX-	Ô
8	422Oui		Transmitting data TX+	Ô
9	TXD_A	Serial port 1 RS232/TTL	Transmitting data TX	Ô
10	RXD_A		Receiving data RX	je
11	TXD_B	Serial port 2 RS232/TTL	Transmitting data TX	Ô
12	RXD_B		Receiving data RX	je
13	GND		Port série 2 sol	Ô
14	SBUS /TTL TX	Serial port 4 SBUS/TTL	SBUS/TTL sending	Ô
15	SBUS /TTL RX		SBUS/TTL receiving	je
16	SBUS/TTL GND		SBUS/TTL ground	Ô
17	TX1P+	Port réseau 1	Transmitting data TX+	Ô
18	TX1M-		Transmitting data TX-	Ô
19	RX1P+		Receiving data RX+	je
20	RX1M-		Receiving data RX-	je
21	GND	Sol	Port série 1 sol	Ô
22	TX2P+	Port réseau 2	Transmitting data TX+	Ô
23	TX2M-		Transmitting data TX-	Ô
24	RX2P+		Receiving data RX+	je
25	RX2M-		Receiving data RX-	je

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

jendicator 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

Type de module	Mode	Vcan1933-8W light status
		REP	SYNC	Réseau local 1 LAN 2	RSSI 123
maître	Un-sync	Allumé	Flashing	Data sending and  receiving, clignotant	Désactivé
maître	Sync	Allumé	Steady on	Data sending and  receiving, clignotant	Proportional to the  strength of the received  signal
esclave	Un-sync	Allumé	Flashing	Data sending and  receiving, clignotant	Recherche
esclave	Sync	Allumé	Steady on	Data sending and  receiving, clignotant	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. When the network port is sending or receiving data, the master and  slave devices correspond to LAN1, and the LAN2 indicator blinks.

More information about the product

TDD (Time Division Duplexing) is a communication technique used in wireless systems where the uplink (transmitting data from the ground control station to the drone) et liaison descendante (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) et liaison descendante (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 (par ex., video streaming).

Comparison Between TDD and FDD

Fonctionnalité	TDD	FDD
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	Oui, supports advanced techniques like beamforming	Non
Ingérence	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.

Système d'antenne:

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

Applications

1. Surveillance et sécurité: Real-time video streaming from drones for law enforcement or border control.
2. Radiodiffusion: High-definition aerial footage for live events or media.
3. Agriculture: Monitoring crops and livestock over vast areas.
4. Réponse aux catastrophes: Sending live video from disaster sites for better coordination.

le portée de transmission of an 8-watt power amplifier (Pennsylvanie) depends on a variety of factors, comprenant:

1. Bande de fréquence: Higher frequencies experience more signal loss over distance (higher free-space path loss).
2. Gain d'antenne: The type and gain of the antenna at both ends (émetteur et récepteur) significantly impact the range.
3. Environmental Conditions: Factors like terrain, bâtiments, weather (pluie, brouillard), et ligne de vue (LoS) can affect range.
4. Modulation Scheme and Data Rate: More complex modulation schemes (par ex., QAM) and higher data rates may reduce effective range due to higher sensitivity to signal degradation.
5. Sensibilité du récepteur: The ability of the receiver to detect a weak signal at a specific distance.