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SIR-C data quality and calibration results

SIR-C data quality and calibration results,10.1109/36.406671,IEEE Transactions on Geoscience and Remote Sensing,Anthony Freeman,M. Alves,B. Chapman,J.

SIR-C data quality and calibration results   (Citations: 63)
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The SIR-C/X-SAR imaging radar took its first flight on the Space Shuttle Endeavour in April 1994 and flew for a second time in October 1994. This multifrequency radar has fully polarimetric capability at L- and C-band, and a single polarization at X-band (X-SAR). The Endeavour missions were designated the Space Radar Laboratory-1 (SRL-1) and -2 (SRL-2). Calibration of polarimetric L- and C-band data for all the different modes SIR-C offers is an especially complicated problem. The solution involves extensive analysis of pre-flight test data to come up with a model of the system, analysis of in-flight test data to determine the antenna pattern and gains of the system during operation, and analysis of data from over fourteen calibration sites distributed around the SIR-C/X-SAR orbit track. The SRL missions were the first time a multifrequency polarimetric imaging radar employing a phased array antenna has been flown in space. Calibration of SIR-C data products involved some unique technical problems given the complexity of the radar system. In this paper, the approach adopted for calibration of SIR-C data is described and the calibration performance of the data products is presented
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    • ...There are three different aspects to the general calibration problem: geometric, radiometric, and polarimetric calibrations [1]-[3]...

    Chunle Wanget al. Polarimetric calibration requirements for a classification scheme base...

    • ...Therefore SAR could have better 2D resolution ability, and have greatly used in military areas, geography remote sensing and so on [1]...

    Yiding Wanget al. SAR radiometric calibration based on vectors of DCT

    • ...Yiding Wang 1 , Yuanshu Li 2 , Zhulei Wang 2...
    • ...1 North China University of Technology, Beijing, 100041 2 Graduate University of Chinese Academy of Sciences, Beijing, 100049...
    • ...1 This work supported by NSFC 60772156 and High Tech...
    • ...Therefore SAR could have higher 2D resolution ability, and have great used in military scouting, geography remote sensing and so on [1]...
    • ...Figure 1 shows the flowchart of active coding radiometric calibration...
    • ...When SAR moves along azimuth direction, the transmitted signal 1 is received by the ACTk on the ground at the starting point s0 of a synthetic aperture length...
    • ...Then random code sequence in the ACT modulates the transmitted signal 1 using���å�SKDVH��)LQDOO\��WKH�VLJQDO���LV�UHIOHFWHG�WR� the SAR by the transmitting antenna in the ACT...
    • ...Fig.1. Flowchart of active coded transponder...
    • ...Case 1: when using single ACT, we can get the autocorrelation values...
    • ...4. SIMULATION EXPERIMENT 4.1. Correlation Simulation...
    • ...In our experiments, the SAR azimuth resolution is selected for 1.5m 2.5m 3.5m 4.5m 5.5m and 6.5m, then we can get the corresponding number of sampling points 1025 510 253 126 126 and 63. This paper takes linear shift register method to generate m sequence and Gold sequence, and the bit of Shift register is 10 9 8 7 7 and 6. When the bit of Shift register is 8, it generates all of the m sequences which are multiple-valued...
    • ...N-bit shift register can have 2N + 1 different orthogonal Gold sequence...
    • ...Oppositely with regard to m sequences, the numbers of m sequence are shown in table 1:...
    • ...Oppositely with regard to m sequences, the numbers of m sequence are shown in table 1: Table 1 Number of m Sequence...
    • ...Fig 6: Between background Fig 7: Between transponders and transponder the number of Gold sequence is 29 + 1. Therefore, if single ACT works, it needs only to effectively separate the coded reflected signal from the background clutter signal, m sequences should be selected...

    Yiding Wanget al. Code sequence selection for SAR radiometric calibration

    • ...In the following, the antenna cross-talks will be measured using transponder deployed at HV and VH. An additional target of azimuthal symmetry [5], [6], [7] is required for the measurement of transmitter-receiver channel imbalance, as discussed in Section IV...
    • ...Such a condition, which has been widely validated for forested areas [5], [6], [7], [10], will be used here for the estimation of transmitterreceiver channel imbalance magnitude and phase...
    • ...This was done with SIR-C whose cross-talk was lower than -30 dB [7]...

    Ridha Touziet al. On the use of transponder measurements for high precision assessment a...

    • ...This system provided multifrequency and multipolarization radar images with a spatial resolution of 30 m. It recorded the magnitude of the backscattering signal, as well as its phase, allowing the derivation of the complete scattering matrix of a scene on a pixel-by-pixel basis [61]‐[63]...

    Yannick Lasneet al. Study of Hypersaline Deposits and Analysis of Their Signature in Airbo...

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