摘要:
In a radar display system wherein radar return signals are received at a first rate and displayed at a second, usually higher rate, each radar return signal is digitized and used to update a main memory comprised of a random access memory so that the main memory contains information related to a plurality of radar return signals arranged therein in a logical order. The main memory information is continuously clocked out for display by an address counter which counts through two complete cycles in a first stage before incrementing a second stage so that the stored information related to each radar return signal is read out for display twice consecutively before the stored information related to the next radar return signal is read out for display.
摘要:
A real-time radar surveillance system comprises at least one land-based non-coherent radar sensor apparatus adapted for detecting maneuvering targets and targets of small or low radar cross-section. The radar sensor apparatus includes a marine radar device, a digitizer connected to the marine radar device for receiving therefrom samples of radar video echo signals, and computer programmed to implement a software-configurable radar processor generating target data including detection data and track data, the computer being connectable to a computer network including a database. The processor is figured to transmit at least a portion of the target data over the network to the database, the database being accessible via the network by at least one user application that receives target data from the database, the user application providing a user interface for at least one user of the system.
摘要:
An onboard equipment network system comprises a radar core device, a GPS core device, an echo sounder core device and a sonar core device and display devices which are connected to a network through a hub. Each core device includes a detecting section or a positioning section, as well as a control section, a power supply section and a data transmitter for transmitting detecting signals or positioning signals, while each display device includes a command section for transmitting command data to the individual core devices for setting their operating conditions and a display section for displaying image data received from the individual core devices. The command data is transmitted using Transmission Control Protocol (TCP) while the image data is transmitted using User Datagram Protocol (UDP).
摘要:
A radar scan conversion from radar data in polar coordinates to radar data in rectangular coordinates is employed to supply (x,y) coordinate data to a display, which has variable azimuthal pixel resolution that increases from the center of the display to its periphery. An aggregate radial scan pattern is generated on the display that consists of a plurality of radials each of which have active lengths that span one or more of a plurality of selected boundary resolution zones of the display. These zones are defined by a series of different hyperbolically-based resolution boundaries which define resolution zones of increasing azimuthal resolution values as the zones extend further from the center of said display towards the periphery of said display. The number of radials that are generated on said display match the average azimuthal resolution of said display for each zone. A process wherein such aggregate radial scan pattern is formed such that the number of radials in each zone from the outermost zone to the center of said display is such that each zone is related to twice as many radials as is its next innermost neighboring zone.
摘要:
The invention relates to an improvement in radar indicators with digital processing of the signal wherein the raw video signal is firstly digitized and stored in temporary memories for subsequent readout at a rate lower than the writing rate, and for some ranges the readout is repeated for more than one time; further for long ranges it includes a pulse stretcher for increasing the brightness of faraway targets; and finally an anti-interference digital processing including a non-linear transfer function of the digitized video signal which is then converted back into analogue video signal for display.
摘要:
A real-time radar surveillance system comprises at least one land-based non-coherent radar sensor apparatus adapted for detecting maneuvering targets and targets of small or low radar cross-section. The radar sensor apparatus includes a marine radar device, a digitizer connected to the marine radar device for receiving therefrom samples of radar video echo signals, and computed programmed to implement a software-configurable radar processor generating target data including detection data and track data, the computer being connectable to a computer network including a database. The processor is figured to transmit at least a portion of the target data over the network to the database, the database being accessible via the network by at least one user application that receives target data from the database, the user application providing a user interface for at least one user of the system.
摘要:
A real-time radar surveillance system comprises at least one land-based non-coherent radar sensor apparatus adapted for detecting maneuvering targets and targets of small or low radar cross-section. The radar sensor apparatus includes a marine radar device, a digitizer connected to the marine radar device for receiving therefrom samples of radar video echo signals, and computed programmed to implement a software-configurable radar processor generating target data including detection data and track data, the computer being connectable to a computer network including a database. The processor is figured to transmit at least a portion of the target data over the network to the database, the database being accessible via the network by at least one user application that receives target data from the database, the user application providing a user interface for at least one user of the system.
摘要:
A method for enhancing video display of a video surveillance system, comprises: a. receiving a first video image In−1 and a second video image In corresponding to a previous scan n−1 and a current scan n of the video surveillance system, b. determining a backwards displacement vector Dn from image In associating with scan n to image In−1 associated with scan n−1; c. determining a predicted image Jn+1 for scan n+1 based on the backward displacement vector Dn and on the image In corresponding to the current scan n. The method further comprises displaying an image based on the predicted image.
摘要:
A real-time radar surveillance system comprises at least one land-based non-coherent radar sensor apparatus adapted for detecting maneuvering targets and targets of small or low radar cross-section. The radar sensor apparatus includes a marine radar device, a digitizer connected to the marine radar device for receiving therefrom samples of radar video echo signals, and computer programmed to implement a software-configurable radar processor generating target data including detection data and track data, the computer being connectable to a computer network including a database. The processor is figured to transmit at least a portion of the target data over the network to the database, the database being accessible via the network by at least one user application that receives target data from the database, the user application providing a user interface for at least one user of the system.
摘要:
A PPI radar apparatus is constructed such that even when a transmission time cycle of radio waves is varied by switchover of a distance range to any of short, middle and long distance ranges, a sweep display time cycle of a radar video signal received in any of the distance ranges is maintained constant at all times; the sweep display time cycle is determined to meet the middle distance ranges, in the short distance ranges in which the reception time of radio waves is short, the video signals are written in storage means in real-time and then displayed by readout of the video signals at a low speed in synchronism with the sweep time cycle, in the long distance ranges in which the reception time of radio waves is long, the video signals are written in storage means in real-time and then displayed by a number of readouts in one sweep display time cycle; and the video signals written in a plurality of storage means are parallelly read out and a mean value or peak of the read-out video signals is obtained by arithmetic operation to thereby enhance the signal-to-noise ratio of the radar image.