Centroid target tracking system utilizing parallel processing of digital data patterns

• US 5,175,694 A
• Filed: 02/08/1990
• Issued: 12/29/1992
• Est. Priority Date: 02/08/1990
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Amato, Gaetano T.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Zianelli, Michael
• Application Number:
  US07/478,815
• Time in Patent Office: 1,055 Days
• Field of Search: 364/516, 364/200, 364/800, 364/131, 364/424.02, 358/125, 358/126, 342/90, 342/91
• US Class Current: 348/169
• CPC Class Codes: F41G 7/2226 comparing the observed data with stored target data, e.g. target configuration data
• CPC Class Codes: F41G 7/2253 Passive homing systems, i.e. comprising a receiver and do not requiring an active illumination of the target
• CPC Class Codes: F41G 7/2293 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 3/7864 T.V. type tracking systems
• CPC Class Codes: G06T 7/70 Determining position or orientation of objects or cameras camera calibration G06T7/80

Abstract

Outputs from data bit areas of a target sensing array, above a signal throld level, are obtained by sequential scanning of groups of the data bit area aligned in columns and rows to form a digital pattern of binary data interrogated to determined the offset of the digital pattern from the centroid of the sensor array. Interrogation is performed by simultaneous counting of data bit pulses derived from separate segments of each group on opposite sides of the centroid and comparing such summations to determine the differences therebetween reflecting directional offsets from the centroid.

Claims

1. In a system for interrogating information acquired by a sensor array having a centroid, sampling means operatively connected to the sensor array for sequential scanning of separate groups of data bits from the sensor array, detector means operatively connected to the sampling means for detecting the scanned data bits in each of said groups above a preset threshold level forming digital patterns, counter means operatively connected to the detector means for simultaneously counting the detected data bits above said preset threshold level within segments of each of said groups to register totals thereof and data processing means operatively connected to the counter means and responsive to differences between the registered totals simultaneously counted for each of the groups respectively for determining offsets of the digital patterns from the centroid of the sensor array.

2. The system as defined in claim 1 wherein said digital patterns have target aimpoints spaced by said offsets from the centroid of the sensor array.

3. The system of claim 2 including target tracking means connected to the data processing means for correctively displacing the sensor array to reduce said offsets toward zero.

4. In a tracking system for spatial quantization of target images detected as binary patterns of data bits derived from an array having a centroid, data processing means for determining offset of the binary patterns with respect to the centroid of said array, comprising data sampling means operatively connected to the array for sequentially scanning separate groups of the data bits, counter means operatively connected to the data sampling means for simultaneously counting segments of each of the groups of the data bits scanned to register summations thereof and readout means operatively connected to the counter means and responsive to differences between said summations of the data bits within the segments of each of the groups respectively for indicating the offset of the target images.

5. The target tracking system as defined in claim 4 including display means connected to the readout means of the data processing means for reproduction of the target images detected by the array with tone variation.

6. In combination with a sensor exhibiting an array of data bits arranged in groups from which a digital pattern is derived, a method comprising the steps of:

simultaneously counting the data bits forming separate segments of each of the groups;

registering totals of the simultaneously counted data bits of the segments within each of the separate groups;

calculating the differences between the registered totals of the simultaneously counted data bits in the segments of the separate groups; and

determining offset of the digital pattern relative to the array from said calculated differences.

7. The method of claim 6, further including the step of:

controllably displacing the sensor until the determined offset approaches zero.