Testers: Tan X, Wang XX, Mo X, Wang Wentao (Wanlan Communication)
Test time: 2019.7.24 Wednesday Test site: Changsha Sany Industrial City West District Factory
1, product introduction
Founded in April 2014 and located in Zhongguancun Science and Technology Park, Haidian District, Beijing, Beijing Wanlantuo Communication Technology Co., Ltd. (www.wlantop.com) is a high-tech company dedicated to the development and application of wireless ad hoc network technology. Military target products are mainly used in aviation platform networking, ship networking, armored vehicle networking, individual soldier networking and other application fields. The civilian target products are mainly for public security and fire protection, anti-terrorism special services, Internet of Things, smart city, smart home, wireless image transmission, mine operation, emergency rescue and disaster relief, environmental monitoring and other application fields.
Second, product display
3. The application topology
product adopts OFDM/COFDM and mobile Adhoc network technology, which can not rely on any basic communication facilities, and can build a distributed centerless multi-hop wireless IP network temporarily, dynamically and quickly, with self-organization, self-recovery, and high anti-destruction capabilities, and supports multi-hop transmission of multimedia services such as data, voice, and video, and can be applied to field operations. Ad-hoc meetings, building communications, environmental monitoring, vehicle networking, public security and fire fighting, anti-terrorism special services, wireless image transmission, mine operations, emergency rescue and disaster relief, individual networking, drones, etc.
Fourth, the actual test
of the product 1.The three radio stations are arranged in the west gate A of the factory area, the central position B of the park (relay), East Gate C, the coordinates are shown in the figure below. The distance between AB and BC is about 400 m and 500 m between BC, and there are trees between the three stations.
Test method 1:
Turn on the radio stations at A and C (the equipment at point B is off) to form a local area network, ping IP between the two points, the network status is good, the delay is basically 1ms, and the maximum is not more than 5ms. The communication is relatively stable. The screenshot of the test is as follows:
Test Method 2:
Open A and C two locations (point B equipment off) position radio station to form a local area network, between the two points through Feiqiu transmission of files (files greater than 200M), the network state is good, at point C to receive point A file transfer speed of about 900Kb/s, point C to point A transmission speed of 380Kb/s, the delay is basically within 200ms, the maximum is close to 500ms. The communication is stable and there is no interruption. The screenshot of the test is as follows:
Test Method 3:
Open A, B (as a relay), C three locations of the radio station to form a local area network, between A, C two points through Feiqiu transmission of files (files greater than 200M), the network is in good condition, at C point to receive A point file transfer speed of about 1.8Mb/s, C point to A point transmission speed of 690Kb/s, the delay is basically within 100ms, the maximum is close to 200ms. The communication is stable and there is no interruption. The screenshot of the test is as follows:
2. The three radio stations are arranged in the southwest corner A of the factory area, the central position B (trunk) and the northeast corner C of the plant, and the coordinate location is shown in the figure below. The straight-line distance between AB is about 420m, and the distance between BC is about 580m, and there are trees and factory buildings between the three sites.
Test method 1:
Turn on the radio stations at A and C (the equipment at point B is off) to form a local area network, and the two points ping IP to each other, the network status is unstable, and the communication is frequently interrupted. The screenshot of the test is as follows:
Test Method 2:
Turn on the radio stations at A, B (as a relay) and C to form a local area network, and point C pings with A and B respectively, and the network status between A and C is not good, and the delay is unstable, and the maximum delay is about 1.5s. The network between B and C is normal, but the delay is unstable, and the maximum delay is about 800ms. The network status between A and B is stable, and the delay is about 300ms.
Test Method 3:
Open A, B (as a relay), C three locations of the radio station to form a local area network, between A, C two points through Feiqiu transmission of files (files greater than 200M), the network state is good, at point C to receive point A file transfer speed of about 2kb/s, C point to point A transmission speed of 20Kb/s, the delay is relatively large. The test screenshot is as follows:
5. Test conclusion
1. The system is convenient for automatic networking, simple to set, can be quickly loaded, and does not need to set up a fixed base station;
Under the condition of slight occlusion at 2.1km distance, the wireless communication is stable, the network delay is small, basically about 1ms, and the speed is close to 1Mb/s.
3. Dual-antenna transmission, wireless penetration capability wall, can realize long-distance wireless transmission under low-rise buildings (below 20m), trees and other conditions, and the penetration performance is better than that of wireless bridges.
4. It can realize two-way simultaneous communication, no central, distributed wireless ad hoc network, and nodes can dynamically join and exit.
5. Mobile phones, tablets, computers and other devices can be dynamically connected through the device's built-in WIFI AP, and the channel, bandwidth, power, rate, IP, key and other parameters of the radio can be set.
6. The device integrates a battery module, which can work without external power supply, which is convenient to work as a relay node.
6. Test question
1: During the actual test of the product, with the increase of the distance between the two base stations (about 1km), if there are multiple buildings and trees between the two (the actual building is less than 20m), the stability of the equipment communication is reduced, and the relay needs to be increased before data transmission can be realized.
2. The test sample antenna is directly connected to the host, which can not be installed in our construction machinery, and the follow-up on-machine experiment needs to use the method of separation of the host and the antenna, and the lead wire needs to be added in the middle (about 3-5m), and the antenna needs to be fixed on the roof of the car with a suction cup antenna.
3. The antenna is rod-shaped (about 60cm long), which shakes greatly during the driving of the roller, and the existing antenna does not have the functions of anti-seismic and anti-swaying.
4. The special power cord + communication line is too short (about 1m), and the wire has no special protection, and the subsequent actual use needs to be customized according to the requirements.
7. Test photos
