COMPRESSED DATA BASE FOR RADAR LAND MASS SIMULATOR

• US 3,769,442 A
• Filed: 08/03/1972
• Issued: 10/30/1973
• Est. Priority Date: 08/03/1972
• Status: Expired due to Term

• Current Assignee: Dan Cohen, Robert A. Heartz
• Original Assignee: Dan Cohen, Robert A. Heartz
• Inventors: Heartz, Robert A., Cohen, Dan
• Primary Examiner(s): Hubler, Malcolm F.
• Application Number:
  US05/277,778
• Time in Patent Office: 453 Days
• Field of Search: 35/10.4 343/5EM
• US Class Current: 345/443
• CPC Class Codes: G01S 7/4052 by simulation of echoes
• CPC Class Codes: G01S 7/4082 using externally generated reference signals, e.g. via remote reflector or transponder
• CPC Class Codes: G09B 9/40 Simulation of airborne radar

Abstract

A process for producing a compressed data base for a radar land mass simulator which is descriptive of a selected land mass. Topographic maps or other data sources are used to determine prominent cultural features and terrain features such as ridge and valley lines. These features are identified by a string of contiguous straight line segments. The end points of each line segment can be identified in terms of their x, y, and z coordinates relative to a chosen origin. Here, however, only the first point in a string is identified in the terms of full x, y, and 2 coordinates, with each subsequent point identified in terms of the increment ( Delta x, Delta y, and Delta z) from the preceding point.

Claims

1. A process for producing a compressed data base for a radar land mass simulator, descriptive of a selected land mass relative to a chosen origin comprising:

identifying land mass features desired to be displayed by a string of contiguous straight line segments in terms of the end points of the segments;

selecting a start point for each string of contiguous straight line segments;

recording the x, y, and z coordinates of each start point relative to the origin; and

recording the Delta x, Delta y, and Delta z of each subsequent point from the preceding point.

2. A process in accordance with claim 1 further including:

recording with the Delta x, Delta y, and Delta z of each subsequent point the radar reflectivity codes to the right and left of the line connecting the point to the preceding point.

3. A process in accordance with claim 1 further including:

recording the Delta x, Delta y, and Delta z of discrete radar targets as points in said strings of contiguous line segments.

4. A process in accordance with claim 3 further including:

recording with the Delta x, Delta y, and Delta z of each discrete radar target its size and intensity.