Download Distributed Space Missions for Earth System Monitoring by Antonio Moccia, Alfredo Renga (auth.), Marco D'Errico (eds.) PDF

By Antonio Moccia, Alfredo Renga (auth.), Marco D'Errico (eds.)

This identify analyzes disbursed Earth remark missions from diverse views. particularly, the problems bobbing up whilst the payloads are disbursed on varied satellites are thought of from either the theoretical and useful issues of view. in addition, the issues of designing, measuring, and controlling relative trajectories are completely awarded on the subject of thought and appropriate applied sciences. Then, the technological demanding situations to layout satellites capable of help such missions are tackled. An plentiful and certain description of missions and reports enhances the booklet subject.

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Moccia and A. Renga approaches zero or π the lines of constant time delay are locally parallel to the lines of constant Doppler. Hence, the Ω-angle assumes the form of an essential parameter that must be used, together with ground range and Doppler resolution, to characterize geometric imaging performance of bistatic SAR. The above considerations put in evidence that the gradient method is characterized by the capability to cover in a simple and direct way the general bistatic geometry. 7), a definite time instant has to be individuated within the coherent integration time.

Some differences between those experiments, anyway, must be put in evidence. First of all, a different geometry was exploited with 47 transmitter incidence angle and 70 receiver incidence angle thus attaining about 23 bistatic angle at the scene centre. In addition, the 150 MHz TerraSAR-X bandwidth was utilized. Finally, an auxiliary antenna was mounted on the top of aircraft fuselage to gather the direct signal from the transmitter. The direct signal was used to set the pulse repetition frequency of the receiver, but also to determine the residual unknown frequency offset between transmitter and receiver oscillators.

Renga SAR processing. e. equivalent PRF higher than processed Doppler bandwidth). Finally it is worth noting that a bistatic SAR can also operate in a partially CW mode, that is the transmitter is a pulsed radar and the receiver performs continuous data acquisition. Obviously, in this case, transmitting PRF has to be tuned to the Doppler bandwidth of bistatic data. • SAR image ambiguities are conventionally interpreted in range and azimuth domains [6], that is ghosts in SAR images are generated in range or azimuth coordinates when, respectively, echoes from proceeding and succeeding pulses arrives back at the antenna simultaneously with the desired one or Doppler spectrum is contaminated by ambiguous signals from antenna azimuth sidelobes.

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