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US 6,184,820 B2Granted
Coherent pulse radar system
AssigneeLockheed Martin Corporation
InventorDale Leonard Kratzer
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AssigneeLockheed Martin Corporation
InventorDale Leonard Kratzer
Estimating the term…
A coherent, frequency agile pulse radar system in which each transmitted pulse is made up of subpulse pairs having frequencies of ωo±Δi forces a jammer to broadband jam the system in order to ensure jamming the actual operating frequency of the system. On reception, a separate receiver channel is utilized for the detection of each subpulse frequency. Within the processing system, the signal return for a subpulse having a frequency of ωo+Δl is multipled times the signal return for the subpulse having a frequency of ωo−Δl to provide a combined signal which is free of the offset frequencies. This combined signal is a standard coherent frequency agile pulse doppler radar signal with the exception that the carrier frequency and the doppler frequency are both doubled. Moving target indicating or doppler processing may be used. N-time-around range ambiguities can be eliminated and sensitivity time control can be used to remove close-in clutter without limiting the pulse repetition rate.
In a coherent pulse radar system of the type including means for providing and transmitting a frequency coded transmission pulse and means for receiving and processing return signals coherently in accordance with said transmitted frequency code, the improvement wherein;
In a method of processing radar signals including the steps of generating and transmitting a frequency coded transmission pulse, receiving a return signal, coherently detecting said return signal in accordance with said transmitted code, and processing the resulting baseband signals to determine the presence of target returns in the return signal, the improvement wherein:
Dependencies are inferred from the claim text.