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Exact(5)
In the moving receiver case, the dwell time on target is defined by the receiving antenna beam width and the speed of the receiving platform.
Moreover, in the moving receiver case, a suitable motion compensation algorithm is required to correct for trajectory deviations of the aircraft only.
In the moving receiver case, effects of trajectory deviations are visible, an issue which should be dealt with at the image formation stage.
In the absence of motion errors, the same BPA can be employed as in the moving receiver case (Figure 11), but without the MoComp step.
Comparing Figures 9 and 8, it is clear that the direct signal Doppler in the moving receiver case is influenced by the trajectory deviations of the helicopter during its flight.
Similar(55)
Even though the fixed and moving receiver cases may appear to be similar, they possess some fundamental differences.
In terms of the moving receiver cases, it is sought to repeat the airborne trials with a more accurate receiver positioning information, and to develop image post-processing algorithms to correct for receiver trajectory deviations using a combination of in-scene target returns along with theoretical calculations.
In terms of the operation, the BPA for the fixed receiver case is very similar to the moving receiver configuration.
Fig. 5 Channel impulse response with a moving receiver, Tx2 Fig. 6 Channel impulse response with a moving receiver, Tx4.
The measurement design is visualized in Figure 2, showing the fixed transmitter and moving receiver vehicle.
On the other hand, a moving receiver has the added complexity of motion compensation.
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