Chinese USRP B210 SRD receiver

An analysis of this model of the Chinese radar showed the following:

In this model (we are talking about a specific instance provided), there is no electronic warfare module. Those. This product consists of a simple Chinese USRP B210 SRD receiver.

https://aliexpress.ru/popular/usrp-b210.html

Moreover, this SRD-receiver is a 2-channel with the ability to connect MIMO antennas. This product uses 3 different antennas (5800, 2400, 900-1500), which are connected to one channel of the SDR receiver through a software-controlled switch. Those. used the simplest way.

Accordingly, the scanning time of a wide band of the desired part of the range leaves much to be desired. If the scanned bands are in different bands (for example, 915, 2400, and 5800), then the 900-1500 antenna will be connected to the SDR receiver first.

The platform will rotate 360 degrees. After that, the 2400 antenna will be connected, the platform will rotate 360 degrees again, then the 5800 antenna will be connected, and again, the platform will rotate 360 degrees. For today’s realities, this is a very long time.

The next problem is the lack of physical visibility of the antenna. Even if a message appears on the operator’s computer that an UAV was detected at some frequency, then without the built-in electronic warfare system, this information is useless because. the operator will only have a degree in azimuth, in the direction that the UAV was detected.

Accordingly, initially, it is necessary to adjust the position of the antennas to 0 degrees in azimuth when starting the radar.
The preliminary result is the following: without the built-in electronic warfare module, this product is absolutely useless. Even in the presence of an electronic warfare module, the applied technical solution for switching various antennas to one input of the SDR receiver is very doubtful in terms of efficiency. As long as the radar module determines what, where, as it will give a command to the electronic warfare module, the UAV will already fly to the desired target. It also raises doubts about the applicability of antennas with only vertical polarization.

Currently, FPV UAVs often use a 915MHz horizontal dipole to transmit control commands. Accordingly, it makes no sense to detect a signal with horizontal polarization by an antenna with vertical polarization. Moreover, the SDR receiver itself can work with MIMO antennas, but this feature is not implemented.