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Mobile Robots communication Link FDM-6680 Testing Reports

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Introduction

In December 2021, IWAVE authorize Guangdong Communication Company to do the peformance testing of FDM-6680. The testing includes Rf and transmission performance, data rate and latency, communication distance, anti-jamming ability, networking ability. The following the reports with details.

1. Rf & Transmission Performance Testing

Build up a test environment according to the right figure. The test instrument is Agilent E4408B. Node A and node B are the devices under test. Their RF interfaces are connected through attenuators and connected to the test instrument via a power splitter to read data. Among them, node A is the robot communication module, and node B is the gateway communication module.

Test Environment Connection Diagram

Test Environment Connection Diagram

Test Result

Number

Detection Items

Detection Process

Detection Results

1

Power indication Indicator light turns on after powering on Normal ☑Unnormal□

2

Operating Band Log in to nodes A and B through WebUi, enter the configuration interface, set the working frequency band to 1.4GHz (1415-1540MHz), and then use the spectrum analyzer to detect the main frequency point and occupied frequency to confirm that the device supports 1.4GHz. Normal ☑Unnormal□
3 Bandwidth Adjustable Log in to nodes A and B through WebUI, enter the configuration interface, set 5MHz, 10MHz, and 20MHz respectively (node A and node B keep the settings consistent), and observe whether the transmission bandwidth is consistent with the configuration through a spectrum analyzer. Normal ☑Unnormal□
4 Adjustable power Log in to nodes A and B through the WebUI, enter the configuration interface, the output power can be set (set 3 values respectively), and observe whether the transmission bandwidth is consistent with the configuration through the spectrum analyzer. Normal ☑Unnormal□

5

Encryption transmission Log in to nodes A and B through the WebUI, enter the configuration interface, set the encryption method to AES128 and set the key (the settings of nodes A and B remain consistent), and it is verified that the data transmission is normal. Normal ☑Unnormal□

6

Robot End Power Consumption Record the average power consumption of the nodes on the robot side in normal transmission mode through a power analyzer. Average power consumption: < 15w

2. Data Rate and Delay Test

Wireless transmission data rate

Test method: Nodes A and B (node A is a handheld terminal and node B is a wireless transmission gateway) select appropriate center frequencies at 1.4GHz and 1.5GHz respectively to avoid interference frequency bands in the environment, and configure a max 20MHz bandwidth. Nodes A and B are connected to PC(A) and PC(B) through network ports respectively. The IP address of PC(A) is 192.168.1.1. The IP address of PC(B) is 192.168.1.2. Install iperf speed testing software on both PCs and perform the following test steps:
●Execute the command iperf-s on PC (A)
●Execute the command iperf -c 192.168.1.1 -P 2 on PC (B)
●According to the above test method, record the test results of 20 times and calculate the average value.

Test Results
Number Preset Test Conditions Test Results(Mbps) Number Preset Test Conditions Test Results (Mbps)
1 1450MHz@20MHz 88.92 11 1510MHz@20MHz 88.92
2 1450MHz@20MHz 90.11 12 1510MHz@20MHz 87.93
3 1450MHz@20MHz 88.80 13 1510MHz@20MHz 86.89
4 1450MHz@20MHz 89.88 14 1510MHz@20MHz 88.32
5 1450MHz@20MHz 88.76 15 1510MHz@20MHz 86.53
6 1450MHz@20MHz 88.19 16 1510MHz@20MHz 87.25
7 1450MHz@20MHz 90.10 17 1510MHz@20MHz 89.58
8 1450MHz@20MHz 89.99 18 1510MHz@20MHz 78.23
9 1450MHz@20MHz 88.19 19 1510MHz@20MHz 76.86
10 1450MHz@20MHz 89.58 20 1510MHz@20MHz 86.42
Average Wireless Transmission Rate: 88.47 Mbps

3. Latency Test

Test method: On nodes A and B (node A is a handheld terminal and node B is a wireless transmission gateway), select appropriate center frequencies at 1.4GHz and 1.5GHz respectively to avoid environmental wireless interference bands, and configure a 20MHz bandwidth. Nodes A and B are connected to PC(A) and PC(B) through network ports respectively. The IP address of PC(A) is 192.168.1.1, and the IP address of PC(B) is 192.168.1.2. Perform the following test steps:
●Run the command ping 192.168.1.2 -I 60000 on PC (A) to test the wireless transmission delay from A to B.
●Run the command ping 192.168.1.1 -I 60000 on PC (B) to test the wireless transmission delay from B to A.
●According to the above test method, record the test results of 20 times and calculate the average value.

latency test diagram
Test Result
Number Preset Test Conditions PC(A) to B Latency (ms) PC(B) to A Latency (ms) Number Preset Test Conditions PC(A) to B Latency (ms) PC(B) to A Latency (ms)
1 1450MHz@20MHz 30 29 11 1510MHz@20MHz 28 26
2 1450MHz@20MHz 31 33 12 1510MHz@20MHz 33 42
3 1450MHz@20MHz 31 27 13 1510MHz@20MHz 30 36
4 1450MHz@20MHz 38 31 14 1510MHz@20MHz 28 38
5 1450MHz@20MHz 28 30 15 1510MHz@20MHz 35 33
6 1450MHz@20MHz 28 26 16 1510MHz@20MHz 60 48
7 1450MHz@20MHz 38 31 17 1510MHz@20MHz 46 51
8 1450MHz@20MHz 33 35 18 1510MHz@20MHz 29 36
9 1450MHz@20MHz 29 28 19 1510MHz@20MHz 29 43
10 1450MHz@20MHz 32 36 20 1510MHz@20MHz 41 50
Average wireless transmission delay: 34.65 ms

4. Anti-jamming Test

Set up a test environment according to the above figure, in which node A is the wireless transmission gateway and B is the robot wireless transmission node. Configure nodes A and B to 5MHz bandwidth.
After A and B establish a normal link. Check the current working frequency through the WEB UI DPRP command. Use the signal generator to generate a 1MHz bandwidth interference signal at this frequency point. Gradually increase the signal strength and query the changes in the working frequency in real time.

Anti-jamming test
Sequence Number Detection Items Detection Process Detection Results
1 Anti-jamming capability When strong interference is simulated through the signal generator, nodes A and B will automatically execute the frequency hopping mechanism. Through the WEB UI DPRP command, you can check that the working frequency point has automatically switched from 1465MHz to 1480MHz Normal ☑Unnormal□

Post time: Mar-22-2024