Accession Number:

AD0417528

Title:

A LINEAR-FM RADAR PULSE COMPRESSION SYSTEM EMPLOYING THICKNESS-TAPERED DISPERSIVE DELAY LINES.

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• Yost,R.C.

Report Date:

1963-07-11

Pagination or Media Count:

20.0

Abstract:

This report describes a radar pulse compression system that employs a linear-FM signal. At the option of the operator, the shape of the signal envelope can be made rectangular, Butterworth, or Gaussian. Ultrasonic dispersive delay lines that are thickness-tapered to provide a linear group time delay characteristic over a frequency band of 2 Mcps are used as the signal expansion and compression devices. Included are the test results of the completed unit with photographs of the waveforms. For the poorest case, the time sidelobes in the receiver output waveform are shown to be 35 db below the peak response. The receiver for the rectangular signal and the receiver for the Butterworth signal are mismatched with accompanying losses in the radar sensitivity of 1.7 db and 0.7 db respectively. An uncom pensated Doppler frequency shift of one kilocycle per second will produce an error of 7 feet in the estimate of the range to an echoing object. Author

Descriptors:

• RADAR
• LINEARITY
• DOPPLER EFFECT

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE