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Interferogram generation process of several problems

Volume is a constant, only counted once, and z (i-P, a g) are expressed,[link widoczny dla zalogowanych], in some areas of energy, when (P, g) small changes occur, this part of the energy of the double counting of the final result the calculation of consumption, so we can take the first calculation of the overall energy picture, and then the energy required for the desired area from which the interception approach to reduce the computational volume, coarse matching of interferogram the speed and accuracy (matching through the use of large windows to achieve ) can be greatly improved. In order to effectively reduce the search area, we used the ER1 & 2 satellite with the orbital parameters, through a series of coordinate transformation relations, the main goals set forth by Curlander 114 Image Location of Wuhan University (Engineering Science) equation,[link widoczny dla zalogowanych], that is inclined away from the equation Doppler equation, the earth's surface model, the approximate location of points by the same name. How to improve the accuracy of this positioning method, the author will do special studies. SAR images in the precise matching process, the article points to the effective removal of error control have been studied. Interferogram generation process, the number of the same name point coherence with the SAR image are closely related, for the poor coherence of the image data must be laid the same name as the larger number of points, and for better data coherence can be reduced the number of the same name point to reduce the rough match time. When we calculated the same name point corresponding to each relative coordinate offset, to the selection of points related to the issue the same name. By the In-SAR processing requirements of coherence itself, the selection of the same name point to the two principles to be adopted: first, the coherence value of size; second, the consistency of the offset coordinates. The first principle is to ensure the selection of coherent and strong points of the same name, which was mainly due to the coherence of SAR is the microwave scattering characteristics of ground objects related to high coherence with high reliability. The second principle is that the SAR image registration, the corresponding coordinates of matching points should be approximately the same shift,[link widoczny dla zalogowanych], because the bandwidth is SAR, SAR echo signal spectrum must be a high degree of overlap to ensure a high coherence. According to these two principles, we first removed the same name coherence value of less than 0.6 points. For the rest of the same name as the principle point of consistency is used, the specific steps are as follows: (1) the offset point coordinates of the same name, coordinates and Y coordinates were selected the maximum of generating a binary image,[link widoczny dla zalogowanych], the offset location in the coordinate marked as 1, the other at the zero mark. (2) For the point marked as 1, using least squares fitting a straight line coordinate offset. According to linear equations, determine the results in the points above and below the number, denoted N and N, the number of points in a straight line denoted as N, marked as 2. If N. . > N, will be the bottom line of all the original mark to 0 to 1; if N <N-. , Is opposite. Marked as 2 points in calculation. (3) Repeat steps (2) until the line equation coefficients of variance of less than a given value. (4) the use of the resulting linear equation to find the corresponding point with them is less than one pixel point. (5) For these two principles to meet the precise matching of the same name point. 3 Table 1 shows the results calculated using different correlation coefficients for the calculation of the time. Testing machine is configured to P41.3GHz, 256MRambus memory. Table 1 with correlation coefficient calculated using the formula directly when this method a straight line in Figure 1 Figure 1 shows the parameter estimates using the above parameter estimation methods on line estimated parameters, the result of 3 times. Should be noted that the method can also be applied to the polynomial parametric curve estimation. 4 Conclusion The trial proved that use of the proposed method can effectively reduce the amount of computation and improve computing efficiency. Here only of the non-normalized cross-correlation calculations. In many cases, image processing, image needs to normalized cross correlation operation, this is because the normalized cross-correlation computation for linear changes in image intensity is not sensitive, then just after a simple derivation can be quickly achieved for the same .
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