Integration Losses and Clutter-Doppler Spread for a Space Based Radar Caused by Ionospheric Scintillation during a Solar Maximum
NAVAL RESEARCH LAB WASHINGTON DC
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Estimates are obtained of the effect of worst-case, ionospheric scintillation on the combined, coherent-noncoherent, integration process and on the clutter-Doppler spread for a specific waveform and a space based radar in a 1030-km orbit. The experiments are representative of worst-case scintillation conditions. The results of these data, which correspond to a period of solar maximum, are compared to earlier results for a period of severe scintillation but minimal solar activity. The frequency-diverse waveform consists of bursts coherent pulse trains of 0.256-s duration at four distinct frequencies per look and six looks per dwell. The space based radar will suffer a combined integration loss not exceeding 2.54 dB, 0.70 dB, and 0.06 dB at VHF, UHF, and L band, respectively, for 95 of the time in worst-case conditions. In addition, the clutter Doppler spread that is induced by ionospheric scintillation is less than 4.90 Hz, 1.58 Hz, and 0.26 Hz at the same frequencies and under the same conditions as for 95 of the time.
- Atmospheric Physics
- Active and Passive Radar Detection and Equipment
- Radiofrequency Wave Propagation