An apparatus configured to generate a first sonar image from first sonar returns corresponding to a first depth range and generate a second sonar image from the first sonar returns and second sonar returns, the second sonar returns corresponding to a second depth range greater than the first depth range of the first sonar returns such that a portion of the second sonar image does not include sonar return data. The portion without sonar return data corresponds to a period of the first sonar returns and depths greater than the maximum depth of the first depth range. The apparatus is configured to generate and display a fill image for the portion of the second sonar image based on at least one set of side facing sonar return data corresponding to the time period associated with the first sonar returns.

Techniques are disclosed for systems and methods to provide touch screen sonar adjustment for mobile structures. A sonar adjustment system includes a user interface with a touch screen display and a logic device configured to communicate with the user interface and a sonar system. The user interface is configured to receive and/or display sonar data provided by the sonar system. The logic device is configured to determine a stimulus or scroll rate component and a sample scale component of a pinch gesture performed on the touch screen display, adjust a rate and/or a sample scale factor for the touch screen display and/or for the sonar system, and render the sonar data according to the adjusted rate and/or sample scale factor. The user interface and logic device may be integrated together to form a multifunction display used to power and/or supply sonar transmission signals to the sonar system.

Techniques are disclosed for systems and methods to provide touch screen sonar adjustment for mobile structures. A sonar adjustment system includes a user interface with a touch screen display and a logic device configured to communicate with the user interface and a sonar system. The user interface is configured to receive and/or display sonar data provided by the sonar system. The logic device is configured to determine a stimulus or scroll rate component and a sample scale component of a pinch gesture performed on the touch screen display, adjust a rate and/or a sample scale factor for the touch screen display and/or for the sonar system, and render the sonar data according to the adjusted rate and/or sample scale factor. The user interface and logic device may be integrated together to form a multifunction display used to power and/or supply sonar transmission signals to the sonar system.

A FMCW frequency-sweeping method and a FMCW LiDAR system. The method includes: obtaining a frequency-sweeping light beam, wherein the frequency-sweeping light beam periodically implements N continuous chirps within a plurality of preset frequency-sweeping measurement periods, N is a positive integer, and N?2, each chirp includes one frequency-ascending stage having a preset frequency-ascending slope and one frequency-descending stage having a preset frequency-descending slope (S201), and a frequency-sweeping bandwidth of each chirp and a preset frequency-sweeping total bandwidth satisfy following relationship: f.sub.s=f.sub.Bw/N, few is the preset frequency-sweeping total bandwidth, f.sub.s is the frequency-sweeping bandwidth, a duration of each frequency-ascending stage or each frequency-descending stage and the preset frequency-sweeping measurement period satisfy the following relationship: T.sub.s=T.sub.0/2N, wherein T.sub.0 is the preset frequency-sweeping measurement period, and T.sub.s is the duration of each frequency-ascending stage or each frequency-descending stage.

A FMCW frequency-sweeping method and a FMCW LiDAR system. The method includes: obtaining a frequency-sweeping light beam, wherein the frequency-sweeping light beam periodically implements N continuous chirps within a plurality of preset frequency-sweeping measurement periods, N is a positive integer, and N?2, each chirp includes one frequency-ascending stage having a preset frequency-ascending slope and one frequency-descending stage having a preset frequency-descending slope (S201), and a frequency-sweeping bandwidth of each chirp and a preset frequency-sweeping total bandwidth satisfy following relationship: f.sub.s=f.sub.Bw/N, few is the preset frequency-sweeping total bandwidth, f.sub.s is the frequency-sweeping bandwidth, a duration of each frequency-ascending stage or each frequency-descending stage and the preset frequency-sweeping measurement period satisfy the following relationship: T.sub.s=T.sub.0/2N, wherein T.sub.0 is the preset frequency-sweeping measurement period, and T.sub.s is the duration of each frequency-ascending stage or each frequency-descending stage.

Various implementations described herein are directed to a non-transitory computer-readable medium having stored thereon a plurality of computer-executable instructions which, when executed by a computer, cause the computer to perform various actions. The actions may include receiving sonar data from a sonar transducer, identifying a subset of the received sonar data to be displayed on the screen, and identifying a deepest level from the subset. The actions may further include determining a depth range that includes the deepest level, and rendering an image of the subset based on the depth range.

Various implementations described herein are directed to a non-transitory computer-readable medium having stored thereon a plurality of computer-executable instructions which, when executed by a computer, cause the computer to perform various actions. The actions may include receiving sonar data from a sonar transducer, identifying a subset of the received sonar data to be displayed on the screen, and identifying a deepest level from the subset. The actions may further include determining a depth range that includes the deepest level, and rendering an image of the subset based on the depth range.

Various implementations directed to a depth display using sonar data are provided. In one implementation, a marine electronics device may include a sonar signal processor and a memory having a plurality of program instructions which, when executed by the sonar signal processor, cause the processor to receive sonar data from a transducer array disposed on a vessel, where the sonar data corresponds to a marine environment proximate to the vessel. The memory may also have program instructions which, when executed by the sonar signal processor, cause the processor to generate point cloud data based on the received sonar data. The memory may further have program instructions which, when executed by the sonar signal processor, cause the processor to generate a depth display based on the point cloud data, where the depth display includes a depth line representing an underwater floor of the marine environment.

Various implementations directed to a depth display using sonar data are provided. In one implementation, a marine electronics device may include a sonar signal processor and a memory having a plurality of program instructions which, when executed by the sonar signal processor, cause the processor to receive sonar data from a transducer array disposed on a vessel, where the sonar data corresponds to a marine environment proximate to the vessel. The memory may also have program instructions which, when executed by the sonar signal processor, cause the processor to generate point cloud data based on the received sonar data. The memory may further have program instructions which, when executed by the sonar signal processor, cause the processor to generate a depth display based on the point cloud data, where the depth display includes a depth line representing an underwater floor of the marine environment.

Provided is an ultrasound imaging apparatus capable of reducing examination time with optimizing parameters on an examination basis. A subject is irradiated with an ultrasound wave, and a plurality of ultrasound transducers receives the ultrasound wave from the subject to obtain received signals. A feature value is calculated from the received signals, the feature value indicating a frequency-dependent characteristic of attenuation of the ultrasound wave, associated with propagation of the ultrasound wave through the subject. A predetermined processing is performed on the received signals using one or more received-signal processing parameters to generate an image. An image processing is performed on the generated image using one or more image processing parameters. Values of the received-signal processing parameter and the image processing parameter are determined based on the feature value.