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Browse Prior Art Database

Time Base Function Generator

IP.com Disclosure Number: IPCOM000096023D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Anuta, PE: AUTHOR [+2]

Abstract

The apparatus generates a pulse train of selectively variable separation for use as a time varying sampling rate control of an A/D converter in a map matching computer system. By this system, a quantized radar ground map can be generated from slant range radar information obtained by, e. g., an aircraft.

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Time Base Function Generator

The apparatus generates a pulse train of selectively variable separation for use as a time varying sampling rate control of an A/D converter in a map matching computer system. By this system, a quantized radar ground map can be generated from slant range radar information obtained by, e. g., an aircraft.

A nonlinear relation exists between ground range R and slant range R' as a function of altitude H. That is, since R' is measured by the time required for the radar return, the nonlinearity of the slant range and ground range is exhibited as a nonlinearity in time (slant range time - ground range time graph). Thus, sampling of the radar return must be done on a correspondingly nonlinear time base, if the samples are to represent ground range increments of equal lengths (sampling pulse - time graph).

In operation, a pulse train of variable time separation is pre-stored on one or more channels of a magnetic drum. The pulse train characteristics are optimized, in separation and delay from the drum synchronization pulse, for a particular altitude H. The radar pulsing time is controlled by the drum synchronization pulse operating through a controllable delay that is varied as a function of the altitude. In the case where the radar is operating at an altitude greater than the altitude for which the system is optimized, an approximation of the proper sampling function is derived from the existing sampling pulse train stored on the drum. This...