GAMMA ISP使用指南：Interferometric SAR Processor用户手册

需积分: 50 24 浏览量更新于2024-07-21 2 收藏 3.09MB PDF 举报

GAMMA ISP使用文档 GAMMA ISP（Interferometric SAR Processor）是GAMMA软件中的一部分，用于处理 Synthetic Aperture Radar（SAR）数据。该文档提供了GAMMA ISP的使用说明、使用步骤等信息，以帮助用户正确使用该软件。 GAMMA ISP的主要功能包括数据转换、ISP SLC参数文件生成、轨道状态矢量操作、校准等。用户可以根据需要选择相应的功能模块，以满足不同的数据处理需求。数据转换是GAMMA ISP的基本功能之一。用户可以使用该功能将原始SAR数据转换为ISP SLC格式，以便于后续处理。数据转换过程中，用户需要指定输入文件、输出文件和转换参数等信息。 ISP SLC参数文件生成是GAMMA ISP的另一个重要功能。该功能允许用户生成ISP SLC参数文件，以便于后续的数据处理。用户可以根据需要选择不同的SAR传感器类型，例如ERS、ENVISAT ASAR、JERS-1等，并指定相应的参数设置。轨道状态矢量操作是GAMMA ISP的高级功能之一。用户可以使用该功能来操作轨道状态矢量，例如生成追加状态矢量、修改状态矢量等。轨道状态矢量操作对于SAR数据处理非常重要，因为它可以影响数据处理的结果。校准是GAMMA ISP的最后一个功能。用户可以使用该功能来校准SAR数据，以提高数据的精度和可靠性。校准过程中，用户需要指定校准参数和校准文件等信息。 GAMMA ISP是一个功能强大且实用的SAR数据处理软件。用户可以根据需要选择相应的功能模块，以满足不同的数据处理需求。同时，GAMMA ISP的使用说明和使用步骤也非常重要，用户需要仔细阅读使用说明，以确保正确使用该软件。知识点： 1. GAMMA ISP是GAMMA软件中的一部分，用于处理SAR数据。 2. GAMMA ISP的主要功能包括数据转换、ISP SLC参数文件生成、轨道状态矢量操作、校准等。 3. 数据转换是GAMMA ISP的基本功能之一，用户可以根据需要选择相应的转换参数。 4. ISP SLC参数文件生成是GAMMA ISP的重要功能之一，用户可以根据需要选择不同的SAR传感器类型。 5. 轨道状态矢量操作是GAMMA ISP的高级功能之一，用户可以使用该功能来操作轨道状态矢量。 6. 校准是GAMMA ISP的最后一个功能，用户可以使用该功能来校准SAR数据。 7. GAMMA ISP的使用说明和使用步骤非常重要，用户需要仔细阅读使用说明，以确保正确使用该软件。

Interferometric SAR Processor - ISP

- 14 -

SkyMed SCS (Single-Look Complex Slant) (Level 1A) data as provided by ASI and creates

the ISP image parameter and SLC file in the format used by GAMMA software. The format

of COSMO-SkyMed SCS data is HDF5. More information is provided in the ISP Reference

Manual.

2.2.10. KOMPSAT-5

The interface between a KOMPSAT-5 SLC in the format provided by KARI and the format

used by the GAMMA Software is the program par_KS_SLC. The program reads KOMPSAT-

5 SCS (Level 1A) (Single-Look Complex Slant) as provided and creates the ISP image

parameter and SLC file in the format used by GAMMA software. The format of KOMPSAT-

5 SCS data is HDF5. More information is provided in the ISP Reference Manual.

2.2.11. IECAS airborne SAR

The interface between a IECAS SLC dataset and the format used by the GAMMA Softwareis

the program par_IECAS_SLC. The program reads dataset generated by IECAS and creates

the ISP image parameter and SLC file in the format used by GAMMA software. More

information is provided in the ISP Reference Manual.

2.3. Manipulation of orbital state vectors

Manipulation of orbital state vectors means either adding state vectors to those provided with

the data or improving the accuracy of the position and velocity information contained in the

metadata accompanying the SLC/PRI/MLI data.

If the SLC/PRI/MLI has been obtained with the MSP, this operation should have already been

carried out. If data is obtained from an external source, the ISP offers a set of programs for

adding and updating state vectors.

2.3.1. Generation of additional state vectors

If the number of state vectors provided with the SLC/PRI data is too small or the state vectors

are too coarse for accurate processing of the image data, additional state vectors can be

computed. The program ORB_prop_SLC calculates additional state vectors using orbit

propagation and interpolation.

2.3.2. Modification of state vectors

The orbit state vectors of ERS and ENVISAT ASAR data provided by the product processing

facilities can be improved by substituting the available records with data provided by external

sources. Depending on the source of the orbital data, the ISP offers specific programs to

determine the state vectors from the external data files and update the state vectors in the ISP

SLC parameter file.

For ERS there are basically two types of orbital information from external sources available:

DELFT orbits provided by DEOS and PRC precision orbits provided by DLR. For ENVISAT

there are two types of orbital information from external sources available: DELFT orbits

Interferometric SAR Processor - ISP

- 15 -

provided by DEOS and DORIS orbits provided by ESA. For more information the user

should refer to the Documentation on InSAR Processing Theory.

For JERS, RADARSAT-1 and SIR-C there are no external sources that allow improving the

orbital state vectors provided with the data. The state vectors provided with PALSAR,

TerraSAR-X and COSMO-SkyMed data do not require an update.

For RADARSAT-2 orbital state vectors are available from MDA.

2.3.2.1. DELFT orbits, ERS and Envisat

To improve the state vectors in the ISP SLC parameter file with orbital data provided by

DEOS, use the programs DELFT_vec2. This program extracts and interpolates Delft ERS-1,

ERS-2, and ENVISAT state vectors to calculate or update the ISP SLC parameter file state

vectors.

The DELFT orbit data are distributed as files (ODR.*) for ERS-1, ERS-2, and ENVISAT. It

is suggested to download the ODR files and the arclist to a local directory, from which the

orbit files required for processing can be retrieved. Once downloaded both the ERS-1 and

ERS-2 ODR files from the website, they should be stored in separate ERS-1 and ERS-2

directories. If this is too much data to download, only the required ODR files for processing

can be downloaded. To find the necessary ODR file, the arclist file contained in the same

directory with the ODR files at DEOS should be used.

2.3.2.2. PRC Precision Orbits, ERS

To extract state vectors from ERS-1 and ERS-2 PRC precision orbit state vector files and

store then in an ISP SLC parameter file, use the program PRC_vec. The program reads ERS-1

and ERS-2 PRC precision state vector files provided by ESA and extracts a specified number

of state vectors that bracket the raw data set. The state vectors are written into the ISP SLC

parameter file along with the start time and time interval between state vectors. The default

number of state vectors is 5 spaced at 30 second intervals. This is adequate unless multiple

frames are processed. Up to 64 state vectors can be extracted.

It is suggested to download the PRC files from ESA ESRIN ftp site to a local directory, from

which the orbit files required for processing can be retrieved.

2.3.2.3. DORIS Precision Orbits, Envisat

To extract state vectors from ENVISAT ASAR DORIS precision orbit state vector files and

store then in an ISP SLC parameter file, use the program DORIS_vec. The program reads

ENVISAT ASAR DORIS precision state vector files provided by ESA and extracts a

specified number of state vectors that bracket the raw data set.

It is suggested to download the DORIS files from ESA ESRIN ftp site to a local directory,

from which the orbit files required for processing can be retrieved.

2.3.2.4. MDA precision orbits, RADARSAT-2

Interferometric SAR Processor - ISP

- 16 -

Update of the orbital state vectors information in the parameter file of a RADARSAT-2 image

is possible with the program RSAT2_vec. The program requires external orbital information

provided by MDA. The state vectors in the parameter file are updated. The user can choose

the number of state vectors to be replaced/inserted in the updated ISP SLC parameter file.

2.4. Calibration

If an SLC/PRI/MLI has been obtained with the MSP but has not been calibrated, it is strongly

suggested to calibrate the image with the MSP programs in order to avoid confusions with

calibration of data generated from a processing facility. Refer to the MSP User’s Guide for

more information.

The ISP supports the radiometric calibration with the programs radcal_SLC, radcal_PRI and

radcal_MLI. In particular, radcal_PRI converts ESA processed short integer format PRI

images to radiometrically calibrated ground range images (float).

Radiometric calibration of SLC/MLI images consists of:

• range spreading loss correction

• antenna gain correction

• normalization reference area correction

• correction for calibration constant (absolute calibration)

Correction for analog digital converter (ADC) saturation is not supported.

Depending on the sensor and on data type, images can be uncalibrated, relatively calibrated or

absolutely calibrated. For more details it is referred to the following Sub-sections.

While the correction for range spreading loss and the normalization reference area can be set

by choosing the desired flag value (see Reference Guide for more information), correction for

antenna gain, if applied, requires an external file (provided with the software). The antenna

diagram consists of a text file in which the antenna pattern for the specific acquisition mode is

listed. Absolute calibration is obtained by providing the calibration constant. Typically this

value is provided by the processing facility and is stored in the ISP SLC parameter file.

The output can be scaled with an additional scaling factor, as required, for example, for output

in short integer format.

Tip: When calibrating a MLI image it is recommended to use an extension *.cmli. When

calibrating a SLC image it is recommended to use an extension *.cslc. When calibrating a

ground range image, e.g. a PRI image, it is recommended to use an extension *.grd.

2.4.1. ERS

The file containing the antenna gain correction is provided with the software. The correction

for the calibration factor is provided by the processing facility and can be found in the ISP

SLC parameter file under the keyword “calibration gain”.

2.4.2. ENVISAT ASAR

Interferometric SAR Processor - ISP

- 17 -

For ENVISAT ASAR the program ASAR_XCA supports the interpretation of the ASAR

external calibration data file (ASA_XCA) provided by ESA. This file contains calibration

scale factors for all ASAR modes and products and the ASAR antenna diagrams for all the

swaths. The program reads the ENVISAT ASAR external calibration data file, writes

calibration factors for the different modes and data products to the screen and generates

antenna diagram files for all the modes or one specified mode in the format used by GAMMA

software.

The correction for the calibration factor is also provided by the processing facility and can be

found in the ISP SLC parameter file under the keyword “calibration gain”.

2.4.3. JERS-1

All image products supported by the GAMMA software are calibrated (see Section 2.2.3).

2.4.4. PALSAR

Level 1.1 (SLC) and 1.5 (orthorectified intensity) data are already relatively calibrated. To

achieve absolute calibration for SLC data the external calibration factor must be provided at

the command line of radcal_SLC. The value -115 dB should be given at the command line.

For more details see Example B. For orthorectified intensity products absolute calibration is

performed during re-formatting of the data with the program par_EORC_PALSAR_geo. The

calibration constant is in this case -83 dB. Hence no further calibration is required. For K&C

PALSAR data the calibration constant of -83 dB shall be applied. Calibration is supported by

the program radcal_MLI.

2.4.5. TerraSAR-X

TerraSAR-X data in SSC, MGD and EEC format are already relatively calibrated. Absolute

calibration is done automatically by the corresponding programs for the generation of the ISP

SLC parameter file (See Section 2.2.7), which add the calibration constant found in the xml

annotation file. For data acquired during the commissioning phase (before 7 January 2008) an

additional offset of 56 dB needs to be added. This can be done for example with radcal_MLI

or radcal_SLC.

2.4.6. Cosmo-SkyMed

SLC image products are calibrated to sigma nougt format when imported with the program

par_CS_SLC. The calibration constant for absolute calibration is provided in the SLC

parameter file.

2.4.7. RADARSAT-2

SLC image products are calibrated. The program par_RSAT2_SLC scales however the image

with a 60 dB factor (see also processing of ERS SLC data). To obtain the correct magnitude,

e.g. after multi-looking, a scaling factor of 10

-6

needs to be applied.

2.5. Multi-looking

剩余81页未读，继续阅读

嘻皮士

粉丝: 1
资源: 5

GAMMA ISP使用指南：Interferometric SAR Processor用户手册

GAMMA软件的InSAR处理流程

GAMMA软件安装教程以及安装所需要的各种包

GAMMA软件新用户手册中文版-2019.pdf

GAMMA LAT说明文档

Hi3518 ISP工具使用

ISP干涉SAR处理器

ISP图像调优指南.pdf

ISP tuning_guide.pdf

MSTAR TV工具的使用方法

GAMMA软件在INSAR干涉处理中的应用

最新资源