Accession Number : ADD010987

Title :   Low Sidelobe Linear FM Chirp System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kretschmer,F F , Jr ; Lewis,B L

Report Date : 13 Sep 1983

Pagination or Media Count : 13

Abstract : An improved FM pulse compression system which has low range-time sidelobes and is doppler tolerant. This system is implemented by using an analog-type linear FM modulated transmission pulse and processing the echo from this pulse by means of baseband sampling at the Nyquist sampling rate and then compressing this sampled signal by means of a discrete phase compression circuit. In brief, the present invention comprises a receiver for receiving the FM echo pulse, a sampling and holding circuit for sampling the echo at baseband at the Nyquist sampling rate and then converting to IF, and a discrete phase compression circuit for compressing the appropriate number of sampled outputs from the sampling and holding circuit. If an echo is properly indexed in the phase compression circuit, then a short pulse with a relatively high amplitude is generated. (Author)

Descriptors :   *Patents, *Pulse compression, *Chirp radar, *Signal processing, Linear systems, Radar pulses, Delay lines, Doppler effect, Frequency modulation, Short range(Time), Short pulses, Compression, Energy, Output, Coding, High rate, Echoes, Signals, Sidelobes, Amplitude, Heterodyning, Inventions, Pulses, Circuits, Sampling

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE