低コストの UAV 無線データリンク

1. 前書き

The digital data link modules are used for the communication between UAVs and the ground station (GS) to send data and receive commands. The two-way radio link must have high reliability and always be connected during the flight. Link module on UAV side must have a low price due to limitation on UAV total cost in mass production.

The main feature of this data link is the low rate of sending and receiving data to reduce the occupied bandwidth and subsequently increase the sensitivity of modules.

ノート 1: The GS module must be capable of communicating with 12 UAVs simultaneously.

2. 技術仕様

パラメーター	価値
Maximum Operating Range	25キロ
Operating Height	10-5000メートル
Max UAVs Speed	100MS
周波数帯域	UHF (upper 400MHz)
Frequency Channel Selection	はい
周波数ホッピング	任意 (優先されます)
UAV module Transmit Power	2W
GS module Transmit Power	10W
データレート	See the below figures (software selectable in range of 1kbps to 500kbps)
Packet transmission delay	≤ 5 ミリ秒
エラー検出	CRC
Channel Coding (FEC)	はい
暗号化	はい
Senstivity	−122dBmの@20kbpsの −199dBmの@40kbpsの −111dBmの@230kbpsの −108dBmの@500kbpsの
MIMO Antenna	任意
動作モード	ポイントからポイントへ (GS to one UAV) Point to MultiPoint (GS to maximum 12 UAVs on air, 同時に)
Receive satuation power	10dBmの
No damage receiver power	20dBmの
起動時間	Less than 2sec
Operationg time	最大 30 minutes continuously
Working tempearure	−20°𝐶 ~ + 60°𝐶

Three working modes for this digital data link can be considered, which are described in the following figures. According to the complexity and the cost of link module (specially on UAV side), each topology can be selected.

3. ネットワークの種類

1- The working frequency of all uplinks and downlinks are different (the nodes work in different channels).

2- The frequency of uplink and downlink for each node is the same but is different with other nodes.

3- The working frequency of all nodes is same as other nodes and GS is managing the nodes to avoid data loss and interference.

ノート 2: In all the above three topologies, frequency hopping is a great advantage but is not a critical feature.

4. Electrical and Interface

パラメーター	価値
UAV Installed Module
入力電圧	9～18V
シリアルポート	1, RS422
シリアルボーレート	9600~460800bps,
アンテナコネクタ	高校
Interface Connector	J30J or DB type
重量	Less than 150g
サイズ (長さ×幅×高さ)	8 × 8 × 3 cm
GS Installed Module
入力電圧	9～18V
Serail Port	1, RS422
Serial Buad Rate	9600~460800bps,
イーサネット	RJ-45, 100Mbpsの
アンテナコネクタ	N-Type
Interface Connector	J30J or DB type
重量	Less than 500g
サイズ (長さ×幅×高さ)	15 × 10 × 4 cm