Non-invasive detection of object by UWB radar

The use of UWB system front-end matching with the antenna from the VCO side adjustment, the key in the vicinity of the VCO circuit matching adjustment; because eight antennas, each antenna will have some slight differences in matching, resulting in the received DC value is not Will be in the same level, and the switch circuit in the switch antenna, it will allow a peak level (about 100ms), and switch the antenna when switching about 420ms ~ 480ms or so. In order to improve the above problem, when switching to the antenna, a variable of the calculation time is used as the current switching antenna, and the time of the switching of the antenna is changed, The time at the time of the operation is changed by 60 ms due to the switching time. As mentioned above, the calculated time will not be a constant value. Therefore, the remainder is divided by a constant, since the value of the first 100 ms can not be used, So to take the signal between 200ms ~ 400ms in order to correctly reflect the antenna front of the object of the reflected signal; After modifying the above problem, the software interface can detect whether there are metal objects in front of the antenna, and L-shaped steel plate to do experiments, The results show that the L pattern can be displayed on the screen; follow-up planning of a variety of different materials of the metal material corresponding to the DC level, and the use of statistical methods can be further accurate analysis of different metal types, the future can be extended application of Homeland Security Survey, Metal material detection and other areas.