Accession Number : AD0663263

Title :   SYNTHESIS OF PULSE COMPRESSION WAVEFORMS WITH WEIGHTED FINITE FREQUENCY COMBS.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : White,D. M.

Report Date : AUG 1967

Pagination or Media Count : 101

Abstract : Frequency weighting in discrete frequency pulse compression radar systems is analyzed and studied experimentally. Pulse compression and matched filter theory from which an analysis of frequency weighting can be developed are presented. The radar ambiguity function, which defines the matched filter range as being equal to the Fourier transform of the input signal spectrum, is derived. This relation is the analytical foundation for the analysis and selection of weighting functions. A practical example of the matched filter theory follows which shows the output waveform to be of the form sin Nx/sin x for uniform frequency weighting. A description of the output reveals the high range sidelobes which can be suppressed by frequency weighting. The DELRA recirculating delay line pulse compressor used to experimentally synthesize the pulse compression outputs for 50 frequency spectra which are amplitude and space weighted is described. Amplitude weighted spectra are used to reduce the range sidelobes, and space weighted spectra are studied mainly for the purpose of thinning the 50 frequency spectra while still providing acceptable pulse compression outputs. Comparisons of the amplitude and space weighting may be made from the results given in photographic and in tabular form which were obtained by using the DELRA. (Author)

Descriptors :   (*RADAR EQUIPMENT, FREQUENCY), SYNTHESIS, RADAR PULSES, PULSE COMPRESSION, MATCHED FILTERS, FUNCTIONAL ANALYSIS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE