摘要:
Provided are a sonar system and transducer assembly for producing a 3D image of an underwater environment. The sonar system may include a housing mountable to a watercraft having a transmit transducer that may transmit sonar pulses into the water. The system may include at least one sidescan transducer array in the housing that receives first and second sonar returns with first and second transducer elements and converts the first and second returns into first and second sonar return data. A sonar signal processor may then generate a 3D mesh data using the first and second sonar return data and at least a predetermined distance between the transducer elements. An associated method of using the sonar system is also provided.
摘要:
A handheld current profiler (HCP) system and method for wading discharge measurement is disclosed. The disclosed HCP has dual capabilities. It serves as a single point current meter that can measure velocity in as little as 3 cm of water. It becomes a current profiler with an additional near surface velocity measurement cell in water about 15 cm or deeper. The HCP has a surface tracking acoustic beam that measures the water level. Thus, in most cases, no manual measurements for water depth and transducer depth are required because both depths may be measured acoustically. In addition, the disclosed HCP can have a very small transducer with a form factor which can lead to minimum flow disturbance.
摘要:
A method includes receiving and storing sensor data including a first plurality of data points indicative of a plurality of respective states of the environment external to a vehicle at a plurality of respective times, operational data including a second plurality of data points indicative of a plurality of respective states of an operational parameter of the vehicle at a plurality of respective times, and synchronization data. The method also includes generating a virtual model of an event involving the vehicle using the stored data, at least by generating a first visual representation of the plurality of respective states of the external environment, generating a second visual representation of the plurality of respective states of the operational parameter, and using the synchronization data to cause the first visual representation to be displayed simultaneously with, and in a time-aligned manner with, the second visual representation.
摘要:
Methods and sonar system for displaying a nautical chart and for adjusting depth indicators on the chart based on a calculated offset between the actual water level and the standard water level on which the chart is based. The offset is based on sonar soundings compared to depths indicated by the chart. The sonar system's processor automatically adjusts the chart's depth indicators to reflect the offset.
摘要:
A method and apparatus for an aircraft location system comprising an aircraft structure and a number of acoustic reflectors associated with the aircraft structure. The number of acoustic reflectors is configured to generate first sound signals in response to receiving second sound signals.
摘要:
An ultrasound imaging system includes: a harmonic filter coupled to an ultrasound transmitter to reduce transmitted harmonic components; a fundamental filter coupled with an ultrasound receiver to reduce received fundamental components; and a fusion processor configured to generate multiple frames of fusion images for two subsequent frames of ultrasound transmissions to improve frame rate. The ultrasound receiver may optionally perform signal alignment and matching to improve image quality. To improve image quality, the ultrasound system may optionally use multiple amplitude-modulated transmit pulses with different delays, or multiple transmit pulses with different amplitudes to extract harmonic signals.
摘要:
A beamforming apparatus includes: a signal output unit configured to output signals; a time difference corrector configured to correct a time difference between the signals; and a weight applier configured to apply a weight value to the signals, according to an error between the signals with the corrected time difference and a target delay pattern.
摘要:
An ultrasonic signal processing method includes: measuring a sound velocity in a subject according to transmission/reception data acquired in ultrasonic transmission of M times (M is an integer equal to or greater than 1 and less than N) along different transmission focus lines among ultrasonic transmission of N times (N is an integer equal to or greater than 2) along multiple transmission focus lines in a case where ultrasonic transmission is sequentially performed at least one time on each of multiple transmission focus lines to create an ultrasonic image for one frame.
摘要:
Techniques to improve resolution in an ultrasound system are disclosed. An exemplary apparatus is a portable ultrasound probe having transducer elements and supporting electronics within the probe. The beam is shaped to split the resolution to sub-pixel accuracy. Super resolution sample technique based on interpolation can be used to further increase resolution. In one embodiment the ultrasound system supports ½ crystal physical resolution and ¼ crystal digital resolution.
摘要:
Mechanical transducers efficiently produce and couple high-power acoustic pulses into liquid and solid media. In a transmitter, mechanical excitation of a thin transmitting plate is provided by an actuator or a motor that causes a mass to strike or a drive rod to push the thin plate. If struck, as the thin plate rings down, it delivers much of its kinetic energy to acoustic radiation in the dense medium. Different mechanisms may be used to excite the plate, and different mechanisms may be used to couple the plate excitations into dense media. Conditions are found for efficient transduction of mechanical energy by a thin plate into acoustic radiation in solid and liquid media. A receiver comprises a plate having matching resonances to the transmitting plate. Discrete narrowband frequencies of acoustic signals are used to detect phase changes in waves reflected from a moving object. By interfering successive return pulses, small changes in phase and amplitude within the reflected beam lead to large changes in interfering voltage waveforms.