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Range Doppler Coupling Magnifier.
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A pulse expander-compressor for magnifying the range-doppler-coupling effects that accompany the use of frequency-modulation derived phase coded pulse compressors in order to accentuate the doppler-coupling velocity effects on target echoes. The foregoing magnification is accomplished by generating a doppler tolerant polyphase coded waveform with equal time spaces inserted between successive code elements in order to make the time difference between the first and last code elements independent of the number of code elements involved. These equal spaces may be variable in order to allow any desired target radial velocity to produce a phase difference between the first and last code elements of 2 pi. The foregoing may be implemented in a pulse expander-compressor by replacing each delay tc in the compressor input-signal expansion circuit by a set of N delay elements tc, and a set of N associated switches, the switches permitting each element in the set to be connected or bypassed, as desired. The time-dispersion circuit for the compressor is likewise modified by replacing each of its Mtc delays by a set of N delay elements Mtc, each of which is independently connectable or bypassable.
APPROVED FOR PUBLIC RELEASE