摘要:
An improved method and apparatus for controlling the display of a plan position indicator radar display are disclosed which result in the elimination of both display flicker and the loss of critical real-time radar return data. The system is clocked by a series of fixed pulses related to the length of the radar beam on the display. Creation of the radar beam is given top system priority. Thereafter, the number of clock pulses allocated for radar beam creation is diminished as necessary to provide time for the display of prestored synthetic display data. The time is taken from a portion of each beam which has been preselected as least critical. Additionally, the beam length based clock pulses are employed to compensate for sweep overlap and in such functions as offset, range scale, and sweep off-scale.
摘要:
A radar return signal is analyzed by amplitude comparators so as to classify the radar return signal with respect to 2.sup.n -1 threshold levels to thus produce n parallel bits for each classification defining the instantaneous amplitude of the radar return signal. The bits in a given significant bit position (most significant, least significant, etc.) comprise a word which moves through the video storage device serially with respect to bits in the same significant bit position and in parallel with respect to bits in the word comprised of different significance bits. Input buffers in the form of n storage registers are provided, each storage register being associated with a particular bit significance. The bits are entered into their associated storage register at a rate dependent upon the desired radar range. The bits are optionally integrated on a bit-by-bit basis and then entered into a main memory having n circulating storage registers arranged in parallel. The information stored in the main memory is subsequently recalled and conveyed through output buffers for display on a cathode ray tube. The output buffers are comprised of n further storage registers. Each of these further storage registers is associated with a particular circulating storage register. The bits from a circulating storage register are conveyed to its associated further storage register. The bits in the output buffers are subsequently passed into a digital to analog converter, the output of the converter being applied to the cathode ray tube 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 protocol is defined to communicate radar data from application servers to thin clients with reduced network bandwidth requirements. The radar scan conversion protocol may be implemented as an extension to existing thin client protocols. The system is also capable of transmitting audio and video data through the application servers to the thin clients using appropriate compressed formats in order to minimize network bandwidth requirements.
摘要:
While received data is stored into a video memory through coordinate conversion, the level of image data is gradually reduced simultaneously with this, by which the image of a target is discriminately displayed readily from among a clutter even without performing adjustment which would conventionally be involved. The radar apparatus is composed of a video memory 6 for successively converting received data from polar to rectangular coordinates along with sweep rotation and storing the data, a FIRST detector for detecting a FIRST so that data write by the coordinate conversion is effected only at a time of FIRST detection, and a subtraction data generator 9 for subtracting a constant value from pixel data of a area designated by a subtraction area designator 14 on the video memory 6 during a period other than FIRSTs.
摘要:
A non-contact type wave signal observation apparatus measures transfer functions of a distributed constant network. A signal is input from a network analyzer to the network to be measured. Electromagnetic waves radiated from the network are received at each observation point on an observation plane arranged in a manner facing the network. The received signals are input to the network analyzer. The transfer functions between an input terminal of the network and each observation point are measured by the network analyzer. The measured transfer functions are converted by an inverse-Fresnel transformer and are stored in memories. The stored data is specified by a control unit and is displayed on a display unit. The stored data can be converted by an inverse-Fourier transformer and is displayed on the display unit as waveforms. Further aspect of the apparatus is, by a non-contact method, to measure signals of a distributed constant network, to determine states of electromagnetic wave in the space, to decrease the amount of calculations in a hologram reconstruction process, and to display a complex three dimensional illustration for a holographic radar.
摘要:
An ultrasound imaging device having functions of storing data of at least one image in a memory and reading the data from the memory to show a freeze-frame on a display in response to a freeze instruction given by a user includes a discerning signal generation unit for generating a discerning signal which marks a change from one image frame to a next image frame in a video signal of ultrasound images, a discerning signal adding unit for marking a point of the change in the video signal by adding the discerning signal to the video signal, a control unit for stopping image data of the video signal from being stored in the memory after receiving the freeze instruction at a moment when the discerning signal is detected in the video signal, so that last two fields of the video signal stored in the memory and forming the freeze-frame are an even field and an odd field of the same frame.
摘要:
A method is disclosed for assigning radar recurrences to radials to be displayed.A converter has means receiving an antenna rotation signal (68 ) and a radar synchronization signal (SY.sub.R), and groups incident recurrences in radials to be displayed as follows:memorization of the incident radials at the rate of their arrival in one of the memories of a group of three with, as the case may be, grouping of the incident recurrence with the already memorized recurrence, with the number of memory being written in getting incremented by one unit at the first blip SY.sub.R following the reception of a blip .epsilon.; andreading of a memory during the reception of a blip .epsilon. in order to constitute a radial, the number of the memory to be read being obtained by deducting 1 from the number of memory being written in at this moment.
摘要翻译:PCT No.PCT / FR88 / 00250 Sec。 371日期:一九八九年十一月十五日 102(e)日期1989年11月15日PCT提交1988年5月17日PCT公布。 第WO88 / 09514号公报 日期为1988年12月1日。公开了一种用于将雷达重复分配给要显示的径向的方法。 A转换器具有接收天线旋转信号(68)和雷达同步信号(SYR)的装置,并且将径向中的事件复现分组为如下显示:将入射径向的速度记录到其中一个存储器 一组三分之一,视情况而定,事件复发与已经记忆的复发分组,写入的内存数量在接收到一个blip epsilon之后,在第一个blip SYR处增加一个单位; 以及为了构成一个放射状态而在接收到一个ip ip ip ip and and and a a a a。。。。,,,,,,,,being。。。。。。。。。。。。。。。。
摘要:
A system for time-compressing radar video is disclosed to improve the grac presentation thereof on a CRT display. Quantized input video is pipelined as cell pairs into and out of a pair of parallelly-arranged memory banks by means of input and output latches. The memory banks are controlled having alternating read and write modes which are interchanged in synchronism with the video scan period so that a preceding scan is read out of one bank at a controlled read clock frequency while a current scan is written into the other bank at a fixed write clock frequency, the degree of video compression being determined by the ratio of the read-to-write frequencies. A pair of series-connected rate multipliers each are fed 6-bit rate words for varying the read clock frequency on either a linear or non-linear scale. Video integration is provided at the inputs of each memory bank by magnitude comparators which compare stored contents of each range cell in the banks with current input video for the respective cell and steer multiplexers to either retain or rewrite the contents of the cell.