Range sidelobe reduction by aperiodic swept-frequency subpulses

Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation

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342159, 342137, 342201, G01S 1326, G01S 1330, G01S 1338

Patent

active

048946605

ABSTRACT:
A swept-frequency radar system transmits pulses consisting of swept-frequency subpulses of nonuniform duration separated by short nontransmitting periods during which an array antenna is resteered. The pulses reflected from a target are processed by a method including estimating the target ranges, producing a reference signal at the time at which the pulse reflected from the target is expected to return. The reflected pulse is phase detected by means of the reference pulse to produce phase detected signals which include information relating to the error between the actual range and the estimated range. The phase detected signals are Fourier transformed to produce range error information. The nonuniform subpulse durations reduce the magnitude of range sidelobes.

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"Frequency-Jumped Burst Waveforms" published in the Proceedings of the IEE/IEEE RADAR '87, 1987 International Radar Conference, London, U.K. Oct. 19-21, 1987.

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