Radar device and the like

  • US 6,424,292 B1
  • Filed: 06/01/2001
  • Issued: 07/23/2002
  • Est. Priority Date: 08/21/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. Radar and like apparatus comprising:

  • a current-image video memory for storing most recently received data;

    a past-image video memory for accumulatively storing previously received data;

    an indicator for superimposing and displaying the data stored in both the current-image video memory and the past-image video memory; and

    a controller for transferring the data stored in the past-image video memory to a buffer in a first step and re-transferring the data stored in the buffer back to the past-image video memory in a second step when display range scale has been changed, wherein address shift data K specifying the amount of address shift per transfer cycle in the buffer and the past-image video memory for said data transfer and re-transfer processes is changed in accordance with the range scale.

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