Method and apparatus for sensing and displaying targets within a preset zone
First Claim
Patent Images
1. A method of sensing radar-detected targets within a preset guard zone comprising the steps of:
- providing information representing the preset guard zone;
storing pixel elements, representing radar echo signals, in a frame store having multiple addressable storage locations;
reading out of said frame store the contents of at least selected ones of the addressable storage locations within said guard zone;
detecting pixel elements of pre-established value stored in the read out selected storage locations;
verifying that at least one of said detected pixel elements of pre-established value is a target pixel element; and
indicating the presence of a target within said preset guard zone when at least one of the detected pixel elements read out from said selected storage locations is verified as a target pixel element.
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Abstract
Target pixel signals representing radar echo signals are stored in an addressable memory; and the contents of at least selected storage locations within a preset guard zone are read out of the memory. If a pixel signal of sufficient value is stored in the read out location, the presence of a target within the preset guard zone is indicated if that pixel signal is verified as being one of several which, presumably, are derived from a target.
22 Citations
22 Claims
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1. A method of sensing radar-detected targets within a preset guard zone comprising the steps of:
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providing information representing the preset guard zone; storing pixel elements, representing radar echo signals, in a frame store having multiple addressable storage locations; reading out of said frame store the contents of at least selected ones of the addressable storage locations within said guard zone; detecting pixel elements of pre-established value stored in the read out selected storage locations; verifying that at least one of said detected pixel elements of pre-established value is a target pixel element; and indicating the presence of a target within said preset guard zone when at least one of the detected pixel elements read out from said selected storage locations is verified as a target pixel element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radar display system comprising:
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radar receiving means for receiving radar signals returned from targets and providing echo signals representing the range and bearing of said targets; frame store means having multiple addressable storage locations for storing digital data therein; converting means coupled to said radar receiving means for converting said echo signals to digital pixel signals; write means coupled to said converting means for writing said digital pixel signals into said frame store at addressed locations corresponding to the range and bearing of the targets from which the radar signals are returned; variable guard zone establishing means operable to establish a guard zone of selectable range and bearing and for writing predetermined guard zone signals into said frame store at addressed locations correspond to the selected range and bearing of the established guard zone; read means coupled to said frame store and operable to read out the contents of at least those locations addressed at and within said guard zone; write-in and read-out address generating means for generating write-in and read-out addresses, respectively, for said frame store; sense means coupled to said read means for sensing a read out pixel signal derived from a target; and display means coupled to said read means for displaying read out guard zone signals and target-derived pixel signals, whereby the presence of targets within the established guard zone is displayed. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. Apparatus for sensing radar detected targets within a preset guard zone in response to the sweeping of an area with radar, comprising:
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m storage means having multiple addressable storage locations;address generating means for addressing said storage means when said area is swept; means for storing pixel signals in said addressed storage locations, said pixel signals representing the presence or absence of a target; means for representing a preset guard zone by selected storage locations of said storage means; read-out means for reading out pixel signals from the storage locations representing said preset guard zone; verifying means for verifying at least one pixel signal read out from the preset guard zone storage locations is a target pixel signal; and indicating means for indicating the presence of a target within said preset guard zone when a pixel signal read out from a preset guard zone storage location is verified as a target pixel signal.
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Specification