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The literature on radar more often use terms that give it such definitions as "multi", "multi", "multi", and mentions the possibility of the radar to receive, process and transmit the information to the consumer at the same time on multiple purposes. So, before you give preference to one of the terms that we consider them in order of mention. Originally multichannel systems were considered in the literature on queuing theory and communications. Therefore worthy analysis of the concept "multi-channel" in these areas. Thus, in the terminology of queuing theory is a multi-channel system that can simultaneously serve multiple applications. Further, the channel means an object or collection of objects, while participating in service applications. Radar can be represented as a queuing system, where the requests for service are the goals that appear in her work area (area of responsibility). Application shall be deemed served, if PLC completed its functionality in full (for example, found purpose, accompanied and led her to a specified area). By analogy, it can be argued that a multi-channel radar, as well as a multi-channel queuing system should provide the service at the same time several applications (targets). In this case, the service time is calculated from the detection of the target until its conclusion in a given area (out of range of the radar). Let us consider briefly the means applied to multi-channel communication systems. The desire to effectively use the link leads to the need to seal, ie, the simultaneous transmission over one link of many independent reports. Equipment, allowing to form at one line of two or more channels, ie, simultaneously and transmit on one line of two or more independent signals, called multichannel. Further, the channel of communication understood as a set of devices provide independent transmission of signals from a source of the messages to the appropriate recipient. Depending on the type of multiplexing multi-channel communication can be frequency-and time-division multiplexing.