How to achieve stable wireless communication in wireless target shooting applications

chenjingjing

How to achieve stable wireless communication in wireless target shooting applications [Copy link]

How to achieve no packet loss, support continuous shooting mode, and reliable and stable data during high-speed operation is the core issue of wireless target shooting, and it is also a problem that wireless communication protocols need to solve.

The wireless communication protocol stack can achieve stable and reliable transmission, TCP large packet transmission technology, UDP reliable transmission technology, variable channel technology, and support laser gun burst mode. The wireless communication has fast response, no tailing, and high determinism.

Usually there are 10-20 targets in a shooting range. In order to prevent the wireless communications of different targets from interfering with each other, it is necessary to set up independent working channels for the wireless communication units of each pair of guns and targets. After the target is hit, it will send a small data packet to the gun controller to inform it of the number of rings, bullet number, and ammunition quantity.

If the target shooting device is switched to the burst mode, a laser beam will be emitted every 75ms or 100ms, and the target position needs to report the detection results to the launch device controller in a timely manner within this time interval. Therefore, the communication process is required to have strong determinism. In this process, if TCP or a similar communication mechanism with a feedback mechanism is selected, it cannot withstand the high-speed timing impact in the burst mode. UDP communication, especially an enhanced, high-reliability UDP communication technology, can well meet the requirements of reliability, real-time and determinism in the single-shot and burst modes during gun shooting.

In the wireless shooting scene, in addition to voice reporting, it is often necessary to summarize the results of all target positions on a monitoring computer or display screen. Note that each target position's wireless communication unit has an independent working channel, and the information summary communication unit is a new independent channel. Therefore, before the shooting device controller needs to send the concentrated ring count or miss information, it needs to switch to the working channel of the summary communication unit in advance. After the communication is completed, it should quickly switch to its normal working channel. If the switch is not timely or the delay is too large, the communication data in the burst mode may be missed.

在无线模块内置的通讯协议栈的调度下，无线报文的编码，收发和信道切换都远远快于外置普通的透传模块，很好的解决了连发射击模式下的电子报靶和集中汇总困难，显著的提升了用户的使用体验。

The wireless target shooting communication technology independently developed by WiMinet R&D team solves the shortcomings of Bluetooth technology in transmission distance and transmission efficiency, and innovatively adds 433MHz to make up for it. In addition, considering many practical factors of wireless target shooting, the overall framework adds the summary broadcast frequency conversion behavior, UDP-based redundant transmission technology, and channel change technology, thereby realizing the function of wireless target shooting and solving many problems in the actual operation of wireless target shooting.