Frequency-Agile Radar Signal Processing.
NAVAL RESEARCH LAB WASHINGTON D C
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Modern radars may incorporate pulse-to-pulse carrier frequency modulation to increase probability of detection, to reduce vulnerability to jamming, and to reduce probability of interception. However, if coherent processing is used for clutter rejection, the frequency of N consecutive pulses must be held constant for N-pulse clutter cancellation or doppler filtering. If M pulses are transmitted during the time the antenna illuminates a target, there are MN coherently integrated echoes available for noncoherent integration in the computer or the operators display to further improve the signal-to-noise ratio SNR. In this report, analytical and simulation methods are employed to determine the balance between coherent and noncoherent integration that yields the greatest SNR improvement. Attention is focused upon three models which include FFT doppler filtering and different systems of combining and noncoherently integrating doppler filtered signals. Curves of detectable SNR as a function of M and N are presented for all three models. Author
- Radar Countermeasures
- Active and Passive Radar Detection and Equipment