The present invention relates to a method for detecting a thickness of a tree canopy based on an ultrasonic echo signal, and belongs to the technical field of agricultural machinery information sensing and detection. The present invention analyzes and discriminates a first effective peak and a last effective peak of the ultrasonic echo signal, obtains a first effective peak time and a last effective peak time, and calculates the thickness of the tree canopy according to a provided calculation formula, thus realizing the direct detection of the thickness of the tree canopy. This method has characteristics such as a high accuracy and a wide application range, and is applicable to the field of detection of the thickness of a tree canopy in industries such as agricultural machinery and forestry machinery.

A parking zone recognizing apparatus for recognizing a parking zone based on transmission/reception signals which are transmitted and received through an ultrasonic sensor installed in a vehicle, comprises an electronic control unit. The electronic control unit is configured to recognize a surrounding target of a parking zone as a high object and determine an available parking zone in the case of a double echo condition that a distance of a second echo signal is twice a distance of a first echo signal, the first echo signal and the second echo signal being determined among echo signals responding to the transmission signal transmitted through the ultrasonic sensor.

A parking zone recognizing apparatus for recognizing a parking zone based on transmission/reception signals which are transmitted and received through an ultrasonic sensor installed in a vehicle, comprises an electronic control unit. The electronic control unit is configured to recognize a surrounding target of a parking zone as a high object and determine an available parking zone in the case of a double echo condition that a distance of a second echo signal is twice a distance of a first echo signal, the first echo signal and the second echo signal being determined among echo signals responding to the transmission signal transmitted through the ultrasonic sensor.

A proximity detection method for detecting absorptive and reflective proximal objects using ultrasound signals and an associated electronic device are provided. The electronic device includes an audio codec, and an acoustics module having a microphone and a speaker. The method includes the steps of: utilizing the speaker to emit an ultrasound signal encoded by the audio codec; utilizing the microphone to sense to generate an incoming ultrasound signal associated with the emitted ultrasound signal; decoding the incoming ultrasound signal into ultrasound waves; and analyzing the ultrasound waves to detect the proximity of a proximal object.

A determining method for obstacles includes determining whether an ultrasonic noise exists in TOF of an ultrasonic wave reflected by an object and received; generating a virtual object on an outline of a parking path that a vehicle is to move on based on the received ultrasonic wave TOF; generating virtual indirect wave TOF using the virtual object; and determining whether the object is located inside or outside the outline of the parking path by comparing real indirect wave TOF, which is indirect wave TOF among the received ultrasonic wave TOFs, with the virtual indirect wave TOF.

A determining method for obstacles includes determining whether an ultrasonic noise exists in TOF of an ultrasonic wave reflected by an object and received; generating a virtual object on an outline of a parking path that a vehicle is to move on based on the received ultrasonic wave TOF; generating virtual indirect wave TOF using the virtual object; and determining whether the object is located inside or outside the outline of the parking path by comparing real indirect wave TOF, which is indirect wave TOF among the received ultrasonic wave TOFs, with the virtual indirect wave TOF.

A space division method includes: receiving a first sound signal that is a medium-high frequency sound signal; decoding the first sound signal by specified decoding to obtain device information of a sound source device that emits the first sound signal; and generating space division information when the device information of the sound source device is successfully obtained, wherein the space division information is configured to indicate that the sound source device and the sound collection device are located in the same spatial region.

An object recognition system using an ultrasonic sensor is proposed, the system including an amplifier amplifying an output of the ultrasonic sensor; an analog-to-digital converter converting an output of the amplifier into a digital signal; and a feature point extractor extracting feature points using an output of the analog-to-digital converter; and an object recognizer recognizing the object by using the feature points extracted from the feature point extractor.

An oil well improvement system having an intrusion detection and response subsystem that provides practical capability to defend offshore drilling platform from surface or subsurface terrorist threats/attacks utilizing modified low-cost off-the-shelf equipment and processor programs. The subsystem processes acoustical and/or RF sensor data to determine contact positions, rates, projected future positions, identification, threat analysis and recommends appropriate soft/hard kill counter measures and further provides control of those countermeasures.

An oil well improvement system having an intrusion detection and response subsystem that provides practical capability to defend offshore drilling platform from surface or subsurface terrorist threats/attacks utilizing modified low-cost off-the-shelf equipment and processor programs. The subsystem processes acoustical and/or RF sensor data to determine contact positions, rates, projected future positions, identification, threat analysis and recommends appropriate soft/hard kill counter measures and further provides control of those countermeasures.