Browse Prior Art Database

# Radar Determination Of Vertical Velocity

IP.com Disclosure Number: IPCOM000098090D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

IBM

## Related People

Stillings, WE: AUTHOR

## Abstract

Through the application of monopulse radar techniques, continuous information is obtained during each horizontal scan. This indicates the vertical distance between the terrain relative to the plane, not only directly in the ground track but for some distance either side of the track. Storing these vertical measurements and noting the time of storage enables determination of the vertical velocity of the craft, both average and instantaneous. This is important, for example, in computing the very useful flight parameter true flight vector.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Through the application of monopulse radar techniques, continuous information is obtained during each horizontal scan. This indicates the vertical distance between the terrain relative to the plane, not only directly in the ground track but for some distance either side of the track. Storing these vertical measurements and noting the time of storage enables determination of the vertical velocity of the craft, both average and instantaneous. This is important, for example, in computing the very useful flight parameter true flight vector.

Video received from radar echo pulses is average detected to provide the average vertical distance of the terrain at each horizontal position increment of the sector of scan. These average vertical distances h are then combined and averaged to provide an overall average vertical distance H. This is for a complete sector scan, stored along with an indication of the time of storage T. Adjacent H values and time of occurrence are related by the following mathematical formula to provide the vertical velocity V(ave.) = (H2-H1)/(T2- T1).

Accuracy of vertical velocity determination is primarily set by the time extent between sector scans, i.e., T2 - T1. Greater accuracy is achieved on shorter time intervals.

1

Page 2 of 2

2