I just wrote the decoding code based on the Level-0 products of Sentinel-1A, according to the library documents downloaded from the website: earth.esa.int, named “A6_S1-IF-ASD-PL-0007_SAR Space Packet Protocol Data Unit.pdf”. I have 3 questions to ask for help:
- I tested several IW mode data(TOPS), and I found that statistical property of echo I decoded is abnormal (shown in Figure below), only focusing on several values(0, 13, 128, 245). I am wondering what’s the matter, whether the decoding of BAQ or statistical approach?
- I did the range compression using the echo I decoded, based on the first burst. The parameters I used are: sampling rate is 6.434523812571428e7 Hz, bandwidth is 56.5MHz, pulse width is 5.240481033595628e-5, but the compression result is incorrect. I don’t know where the problem is, is it caused by compression method or echo decoding method ?
- Is there a processing tool based on the Sentinel-A raw data ? Covert raw data to complex echo data.