Signal processing device, signal processing method, and program

Abstract

This signal processing device comprises a simulated SAR image generation unit and an evaluation calculation unit. The simulated SAR image generation unit generates simulation information including: a simulated SAR image formed from prediction values of pixels predicted to be obtained when a target region is observed in a steady state; and prediction reliability information indicating the reliability of the prediction values of the pixels. The evaluation calculation unit uses the simulation information to determine the evaluation index whereby a target SAR image, which is an analysis target, is evaluated.

Claims

1. A simulated SAR image generation means that generates simulated information including a simulated SAR image composed of predicted values ​​for each pixel that are predicted to be obtained when a target region in a steady state is observed, and predicted reliability information indicating the reliability of the predicted values ​​for each pixel, The system includes an evaluation calculation means that uses the aforementioned simulated information to obtain an evaluation index for evaluating the target SAR image that is the subject of analysis, The aforementioned target SAR image is composed of observed values ​​of each pixel that was actually observed in the target region. The aforementioned evaluation index is determined for each corresponding pixel in the simulated SAR image and the target SAR image. The aforementioned evaluation index is an index that probabilistically evaluates the degree to which the observed values ​​constituting the target SAR image are consistent with the predicted values ​​constituting the simulated SAR image. Signal processing device.

2. The predicted value for each pixel is a complex numerical value that includes a reflection intensity component and a phase component, which are predicted to be obtained when the target region in a steady state is observed under the same observation conditions as the target SAR image. The prediction reliability information includes at least one of the following: a prediction distribution showing the probabilistic distribution of the predicted value, a statistical indicator of the prediction distribution, and the probability that the value is the predicted value. The signal processing apparatus according to claim 1.

3. Each of the aforementioned evaluation indicators is the posterior probability that the observed value is observed for each corresponding pixel in the simulated SAR image and the target SAR image. The evaluation calculation means uses the simulated information and the target SAR image to determine the evaluation index for each corresponding pixel. The signal processing apparatus according to claim 1 or 2.

4. Each of the evaluation indicators is the simultaneous probability that the observed value is observed for each corresponding pixel in the simulated SAR image and the plurality of target SAR images. The evaluation calculation means is A posterior probability calculation means that uses the simulated information and each of the multiple target SAR images to determine the posterior probability that the observed value is observed for each corresponding pixel, The system includes a simultaneous probability calculation means for determining the evaluation index for each corresponding pixel by combining the posterior probabilities obtained using each of the plurality of target SAR images for each corresponding pixel. The signal processing apparatus according to claim 1 or 2.

5. Each of the evaluation indicators is the simultaneous probability that the observed value is observed for each corresponding pixel group in the simulated SAR image and the target SAR image. The evaluation calculation means is A posterior probability calculation means that uses the simulated information and the target SAR image to calculate the posterior probability of obtaining the observed value for each corresponding pixel, The system includes a simultaneous probability calculation means for determining the evaluation index for each corresponding pixel group by combining the posterior probabilities obtained for each pixel constituting the pixel group. The signal processing apparatus according to claim 1 or 2.

6. The system further comprises change detection means for detecting changes in the target area using the aforementioned evaluation index. The signal processing apparatus according to claim 1 or 2.

7. The system further comprises a reconstruction means for generating reliable 3D information, which includes 3D information including estimated values ​​of reflection intensity and phase for each of the 3D elements constituting the target region, and estimated reliability information indicating the reliability of the estimated values ​​for each of the 3D elements, using multiple observed SAR images. The simulated SAR image generation means generates the simulated information using the reliable three-dimensional information and the observation conditions when actual measured values ​​are observed. The signal processing apparatus according to claim 1 or 2.

8. One or more computers, This generates simulated information including a simulated SAR image composed of predicted values ​​for each pixel that are expected to be obtained when the target region in a steady state is observed, and prediction reliability information indicating the reliability of the predicted values ​​for each pixel. This includes determining an evaluation index for the target SAR image to be analyzed using the aforementioned simulated information, The aforementioned target SAR image is composed of observed values ​​of each pixel that was actually observed in the target region. The aforementioned evaluation index is determined for each corresponding pixel in the simulated SAR image and the target SAR image. The aforementioned evaluation index is an index that probabilistically evaluates the degree to which the observed values ​​constituting the target SAR image are consistent with the predicted values ​​constituting the simulated SAR image. Signal processing method.

9. On one or more computers, This generates simulated information including a simulated SAR image composed of predicted values ​​for each pixel that are expected to be obtained when the target region in a steady state is observed, and prediction reliability information indicating the reliability of the predicted values ​​for each pixel. Using the aforementioned simulated information, the system is instructed to determine an evaluation index for the target SAR image being analyzed. The aforementioned target SAR image is composed of observed values ​​of each pixel that was actually observed in the target region. The aforementioned evaluation index is determined for each corresponding pixel in the simulated SAR image and the target SAR image. The evaluation index is a program that probabilistically evaluates the degree to which the observed values ​​constituting the target SAR image are consistent with the predicted values ​​constituting the simulated SAR image.

Images