100km TDD双方向ビデオデータ無線伝送

100km TDD bidirectional video data wireless transmission Appearance

バージョン履歴

日付	バージョン	変更の説明
20231219	V1.0	初期バージョン
20240315	V2.0	Modify the weight dimensions, modify the total data  in Table MCS & 感度
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

概要

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, 適応周波数選択, アダプティブストリーム, automatic retransmission, and automatic power control, これにより、対マルチパスおよび対干渉の能力が大幅に向上します。, 信頼性が高いという特徴を持っています, 良い安定性, そして低遅延.

この製品は消防用に適しています, 検査, 監視, およびその他のシナリオ,  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.
• 自動アンテナ選択をサポート: 噛み合わせの状況に応じて, 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.

仕様

システムパラメータ	テクニカルインデックス
Equipment model	Vcan1933-8W
動作周波数	1350～1470MHz
無線周波数	2T2R
送信電力	39dBmの (8-watt PA)
伝送距離	100KM (空対地LOS)
チャネル帯域幅	10メガヘルツ
変調モード	QPSK/16QAM
受信感度	See Table (MCS & 感度)
スピード	17Mbps@16QAM3/4
Communication encryption	AES256
伝送遅延	≤10ms
無線周波数インターフェース	SMA*2
Equipment interface	XT30PW-M
Equipment interface	100Mbps Ethernet*2
	TTL/RS232*2
	RS422*1
	SBUS/TTL*1
全体の消費電力	≤48W@4Mbps(Air uint)
	≤12W@1Mbps(Ground uint)
寸法(長さ*幅*高さ)	163*77*25ミリ
重量	340グラム
動作電圧	DC22~30V,代表値: +24V@2A
使用温度	-40~+75℃

MCS & 感度 (10メガヘルツ)
No.	MCS	Total uplink and downlink  throughput (Mbpsの)	感度 (dBmの)
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

寸法図

寸法と重量

• 寸法 (長さ*幅*高さ): 163mm*77mm*25mm(SMA 10mmを含む)
• 重量 : 340グラム

製品インターフェースの定義

インターフェース図

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.

インターフェースの定義

電源インターフェース: XT30PW-M. 電源範囲: DC22-30V Typical value:24V@2A 

Linear  order.	ピン名	インターフェースの定義	インターフェースの説明	Signal  direction
1,2,3,4	GND	地面	地面
5	422A	Serial port 3 RS-422	Receiving data RX+	私
6	422B		Receiving data RX-	私
7	422Z		Transmitting data TX-	○
8	422Y		Transmitting data TX+	○
9	TXD_A	Serial port 1 RS232/TTL	Transmitting data TX	○
10	RXD_A		Receiving data RX	私
11	TXD_B	Serial port 2 RS232/TTL	Transmitting data TX	○
12	RXD_B		Receiving data RX	私
13	GND		シリアルポート 2 地面	○
14	SBUS /TTL TX	Serial port 4 SBUS/TTL	SBUS/TTL sending	○
15	SBUS /TTL RX		SBUS/TTL receiving	私
16	SBUS/TTL GND		SBUS/TTL ground	○
17	TX1P+	ネットワークポート 1	Transmitting data TX+	○
18	TX1M-		Transmitting data TX-	○
19	RX1P+		Receiving data RX+	私
20	RX1M-		Receiving data RX-	私
21	GND	地面	シリアルポート 1 地面	○
22	TX2P+	ネットワークポート 2	Transmitting data TX+	○
23	TX2M-		Transmitting data TX-	○
24	RX2P+		Receiving data RX+	私
25	RX2M-		Receiving data RX-	私

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

私ndicator Meaning

The RSSI light represents the strength of the received signal
Number of RSSI energy lights on	受信エネルギー dBm
3 RSSI lights on	about -50dBm
2 RSSI lights on	about -80dBm
1 RSSI light on	about -95dBm

モジュールの種類	モード	Vcan1933-8W light status
		PWR	SYNC	LAN 1 LAN 2	RSSI 123
マスター	Un-sync	Powered on	Flashing	Data sending and  receiving, 点滅する	オフ
マスター	Sync	Powered on	Steady on	Data sending and  receiving, 点滅する	Proportional to the  strength of the received  signal
奴隷	Un-sync	Powered on	Flashing	Data sending and  receiving, 点滅する	Searching
奴隷	Sync	Powered on	Steady on	Data sending and  receiving, 点滅する	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. ネットワークポートがデータを送受信しているとき, the master and  slave devices correspond to LAN1, and the LAN2 indicator blinks.

More information about the product

TDD (時分割二重化) is a communication technique used in wireless systems where the uplink (transmitting data from the ground control station to the drone) そしてダウンリンク (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) そしてダウンリンク (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 (例えば, video streaming).

Comparison Between TDD and FDD

特徴	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	はい, supports advanced techniques like beamforming	いいえ
干渉	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.

アンテナシステム:

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

アプリケーション

1. 監視とセキュリティ: Real-time video streaming from drones for law enforcement or border control.
2. 放送: High-definition aerial footage for live events or media.
3. Agriculture: Monitoring crops and livestock over vast areas.
4. 災害対応: Sending live video from disaster sites for better coordination.

ザ・ 送信範囲 of an 8-watt power amplifier (PA) depends on a variety of factors, 含む:

1. 周波数帯域: Higher frequencies experience more signal loss over distance (higher free-space path loss).
2. アンテナ利得: The type and gain of the antenna at both ends (送信機と受信機) significantly impact the range.
3. 環境条件: Factors like terrain, 建物, weather (雨, 霧), そして視線 (LoS) can affect range.
4. Modulation Scheme and Data Rate: More complex modulation schemes (例えば, QAM) and higher data rates may reduce effective range due to higher sensitivity to signal degradation.
5. Receiver Sensitivity: The ability of the receiver to detect a weak signal at a specific distance.