Browse Prior Art Database

Display Symbol Tracker

IP.com Disclosure Number: IPCOM000093405D
Original Publication Date: 1967-Sep-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

Hansen, RR: AUTHOR [+3]

Abstract

Symbol T is displayed on the screen of display system 10. A second symbol C, which is also displayed on the screen and is under operator control, is maneuvered across the screen to intercept symbol T which is moving along path 11. The interception of symbol T by symbol C is sensed by tracking circuit 12. Then the tracking circuit causes the symbol C to automatically track the moving symbol T across the screen.

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Display Symbol Tracker

Symbol T is displayed on the screen of display system 10. A second symbol C, which is also displayed on the screen and is under operator control, is maneuvered across the screen to intercept symbol T which is moving along path
11. The interception of symbol T by symbol C is sensed by tracking circuit 12. Then the tracking circuit causes the symbol C to automatically track the moving symbol T across the screen.

One application for the tracker is a radar target display system. Radar system 13 acquires a moving target, not shown, and provides radar signals which are indicative of the target's position.

The radar signals, in turn, are fed into data processor system 14 which includes I/O devices not show n. The latter convert the radar signals to corresponding X-Y coordinate driving signals XR and XR. Display 10 generates and displays on the screen symbol T which represents the radar acquired target. Symbol T is moved across the screen in response to the computer generated signals XR and YR along path 11 which represents the course of the acquired moving target.

In addition, symbol T moves across the screen at a rate which is proportional to the velocity of the target.

Display 10 also generates on the screen the tracking symbol C which represents, for example, an electronic cross hair. Positioning of symbol C is provided by an X-Y coordinate signal generator, not shown, which is part of cross hair positioner control unit 15 and which generates the X-Y coordinate driving signals XC and YC at its output for this purpose. Manual and automatic operational modes are provided by manual controls 16 and input control terminals 17, respectively, for unit 15.

Tracker 12 includes X and Y channels 18 and 19 and ganged switches I and II, respectively. As shown in greater detail with respect to channel 18, in each channel a coincidence detector 20 actuates a normally open gate circuit 21. The latter allows the respective coordinate signal XR and YR with which the particular channel 18 or 19 is associated to be fed to analog memory 22. The output of memory 22 in each channel is connected to the lower terminal 23 of their respectively associated switches I and II. Detector 20 of channel 18 has two inputs which are fed by signals XC and XR, respectively. The two inputs of coincidence detector, not shown, of channel 19 like wise are fed by signals YC and YR respectively.

Unit 15 is initially placed in its manual operational mode by placing switches I and II in their upper positions associated with...