collegamento dati radio UAV a basso costo

Sommario

1. introduzione

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.

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

2. Specifiche tecniche

Parametri	Valore
Maximum Operating Range	25km
Operating Height	10-5000m
Max UAVs Speed	100SM
Banda di frequenza	UHF (upper 400MHz)
Frequency Channel Selection	sì
Salto di frequenza	Opzionale (è preferito)
UAV module Transmit Power	2W
GS module Transmit Power	10W
Velocità dati	See the below figures (software selectable in range of 1kbps to 500kbps)
Packet transmission delay	≤ 5 millisecondo
Rilevamento degli errori	CRC
Channel Coding (FEC)	sì
crittografia	sì
Senstivity	−122dBm@20kbps −199dBm@40kbps −111dBm@230kbps −108dBm@500kbps
MIMO Antenna	Opzionale
Modalità di funzionamento	Punto a punto (GS to one UAV) Point to MultiPoint (GS to maximum 12 UAVs on air, contemporaneamente)
Receive satuation power	10dBm
No damage receiver power	20dBm
Tempo di avvio	Less than 2sec
Operationg time	Massimo 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. Tipo di networking

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.

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

4. Electrical and Interface

Parametri	Valore
UAV Installed Module
Tensione di ingresso	9~18V
Porta seriale	1, RS422
Tasso di baud seriale	9600~460800bps,
Connettore antenna	liceo
Interface Connector	J30J or DB type
Peso	Less than 150g
Dimensione (LxLxA)	8 × 8 × 3 centimetro
GS Installed Module
Tensione di ingresso	9~18V
Serail Port	1, RS422
Serial Buad Rate	9600~460800bps,
Ethernet	RJ-45, 100Mbps
Connettore antenna	N-Type
Interface Connector	J30J or DB type
Peso	Less than 500g
Dimensione (LxLxA)	15 × 10 × 4 centimetro

Our low-cost UAV Radio Data Link does not has ethernet port, only serial port. The antenna connector is not N-Type, but SMA-Type. si prega di controllare il link sottostante.