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The SZ DJI Technology Co., Ltd patent solves the following problem:
Proximity sensor like ultrasonic sensor that is widely used to detect the distance to objects. In particular, the ultrasonic sensor usually configured to generate ultrasonic signals of an ultrasonic transducer and receiving the echo signal reflected by the object. By calculating the time between sending the ultrasonic signal and receiving the echo signals, the distance to an object can be determined based on the propagation speed of sound in the propagation medium like air.
Our analysis of this patent is as follows:
SZ DJI Technology Co., Ltd’s patent US 9223023 B2 deals with Proximity sensing systems and methods.
Methods, systems and devices are provided for improving the range and accuracy of its proximity measurement such as ultrasonic sensing systems. In particular, the blind zone because of the reverberation signal can be reduced or eliminated by attenuating signals received during the time period corresponding to the blind zone out. In one implementation, an attenuator circuit is selected with a switch to process signals received in the blind zone period and deselected switch after the time zone period. Moreover, accuracy and other measures can be improved by various gain given to the received signal based on a variety of measuring distance. In one implementation, a gain-adjustable amplifier controlled by a gain control signal to provide incremental gain to increase.
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