100km TDD dwukierunkowa bezprzewodowa transmisja danych wideo

100km TDD bidirectional video data wireless transmission Appearance

Historia wersji

Data	Wersja	Opis modyfikacji
20231219	V1.0	Wersja pierwotna
20240315	V2.0	Modify the weight dimensions, modify the total data in Table MCS & Wrażliwość
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

Przegląd

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, Adaptacyjny wybór częstotliwości, Strumień adaptacyjny, Automatyczna retransmisja, and automatic power control, co znacznie poprawia zdolność anty-Multipath i anty-interferencji, i ma cechy wysokiej niezawodności, dobra stabilność, i niskie opóźnienie.

Ten produkt jest odpowiedni do walki pożarowej, kontrola, monitorowanie, i inne scenariusze,  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.
• Obsługuje automatyczny wybór anteny: Według sytuacji okluzji, the optimal antenna transmission is selected in real time.
• Supports the coexistence of multiple set: Wspierać do 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.

Specyfikacja

Parametr systemowy	Indeks techniczny
Equipment model	VCAN1933-8W
częstotliwość pracy	1350~ 1470 MHz
Częstotliwość radiowa	2T2R
Moc transmisji	39dBm (8-watów PA)
odległość transmisji	100KM (Los powietrza do ziemi)
szerokość kanału	10MHz
tryb modulacji	QPSK/16QAM
Odbieranie wrażliwości	Zobacz tabelę (MCS & Wrażliwość)
Prędkość	17MBPS@16QAM3/4
Szyfrowanie komunikacji	AES256
Opóźnienie transmisji	≤10 ms
Interfejs częstotliwości radiowej	SMA*2
Equipment interface	XT30PW-M
Equipment interface	100Mbps Ethernet*2
	TTL/RS232*2
	RS422*1
	SBUS/TTL*1
Całkowity pobór mocy	≤48W@4Mbps(Air uint)
	≤12W@1Mbps(Ground uint)
Wymiar(L * W * H)	163*77*25mm
Waga	340sol
napięcie robocze	DC22~30V,Typowa wartość: +24V@2A
Temperatura pracy	-40~+75℃

MCS & Wrażliwość (10MHz)
No.	MCS	Total uplink and downlink throughput (Mbps)	Wrażliwość (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	16GAM3 / 4	16.4	-91

Product dimension and weight

Schemat wymiarowy

Wymiary i waga

• Wymiar (L * W * H): 163mm*77mm*25mm(w tym SMA 10mm)
• Waga : 340sol

Definicja interfejsu produktu

Schemat interfejsu

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.

Definicja interfejsu

Interfejs zasilania: XT30PW-M. Zakres napięcia zasilania: DC22-30V Typical value:24V@2A

Linear order.	Nazwa pinu	Definicja interfejsu	Opis interfejsu	Signal direction
1,2,3,4	GND	Grunt	Grunt
5	422ZA	Serial port 3 RS-422	Receiving data RX+	ja
6	422b		Receiving data RX-	ja
7	422Z		Transmitting data TX-	O
8	422i		Transmitting data TX+	O
9	Txd_a	Serial port 1 RS232/TTL	Transmitting data TX	O
10	Rxd_a		Receiving data RX	ja
11	TXD_B	Serial port 2 RS232/TTL	Transmitting data TX	O
12	RXD_B		Receiving data RX	ja
13	GND		Port szeregowy 2 grunt	O
14	SBUS /TTL TX	Serial port 4 SBUS/TTL	SBUS/TTL sending	O
15	SBUS /TTL RX		SBUS/TTL receiving	ja
16	SBUS/TTL GND		SBUS/TTL ground	O
17	TX1P+	port sieciowy 1	Transmitting data TX+	O
18	TX1M-		Transmitting data TX-	O
19	Rx1p+		Receiving data RX+	ja
20	RX1M-		Receiving data RX-	ja
21	GND	Grunt	Port szeregowy 1 grunt	O
22	TX2P+	port sieciowy 2	Transmitting data TX+	O
23	TX2M-		Transmitting data TX-	O
24	RX2P+		Receiving data RX+	ja
25	RX2M-		Receiving data RX-	ja

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

jandicator Meaning

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

Typ modułu	Tryb	Vcan1933-8W light status
		PWR	SYNCHRONIZACJA	LAN 1 LAN 2	RSSI 123
mistrz	Un-sync	Włączono	Błyskowy	Data sending and receiving, błyskowy	Poza
mistrz	Synchronizacja	Włączono	Steady on	Data sending and receiving, błyskowy	Proportional to the strength of the received signal
niewolnik	Un-sync	Włączono	Błyskowy	Data sending and receiving, błyskowy	Badawczy
niewolnik	Synchronizacja	Włączono	Steady on	Data sending and receiving, błyskowy	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. Gdy port sieciowy wysyła lub odbiera dane, the master and slave devices correspond to LAN1, and the LAN2 indicator blinks.

More information about the product

TDD (Dupleksowanie podziału czasu) is a communication technique used in wireless systems where the uplink (transmitting data from the ground control station to the drone) i łącze w dół (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) i łącze w dół (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 (np., Streaming wideo).

Comparison Between TDD and FDD

Cecha	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	tak, supports advanced techniques like beamforming	Nie
Ingerencja	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.

Ograniczenia mocy i rozmiaru:

• 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.

System antenowy:

• On Drone: Fiberglass omnidirectional or small directional patch antennas.
• Stacja naziemna: High-gain parabolic, Yagi antennas or flat panel antennas with tracking systems do komunikacji dalekiego zasięgu.

Aplikacje

1. Nadzór i bezpieczeństwo: Real-time video streaming from drones for law enforcement or border control.
2. Nadawczy: High-definition aerial footage for live events or media.
3. Rolnictwo: Monitoring crops and livestock over vast areas.
4. Reakcja na katastrofę: Sending live video from disaster sites for better coordination.

Plik Zakres transmisji of an 8-watt power amplifier (ROCZNIE) depends on a variety of factors, włącznie z:

1. Pasmo częstotliwości: Higher frequencies experience more signal loss over distance (higher free-space path loss).
2. Zysk anteny: The type and gain of the antenna at both ends (Nadajnik i odbiornik) significantly impact the range.
3. Warunki środowiskowe: Factors like terrain, Budynki, pogoda (deszcz, mgła), i linii wzroku (Los) can affect range.
4. Modulation Scheme and Data Rate: More complex modulation schemes (np., QAM) and higher data rates may reduce effective range due to higher sensitivity to signal degradation.
5. czułość odbiornika: The ability of the receiver to detect a weak signal at a specific distance.