Abstract
Microwave Imager Combined Active and Passive (MICAP), which is a package of active and passive microwave instruments including L/C/K-band radiometers and L-band scatterometer, has been approved to be taken onbord the Chinese Ocean Salinity Mission. The L-band one-dimensional synthetic aperture radiometer (L-Rad) is the key part of MICAP to measure sea surface salinity (SSS). Since radio frequency interference (RFI) is reported as a serious threat to L-band radiometry, the RFI detection and mitigation techniques must be carefully designed before launch. However, these techniques need to be developed based on the knowledge of how RFI affects complex correlation, visibility function, and reconstructed brightness temperature. This paper presents a time-domain signal modeling method for the simulation of interferometric measurement under RFI’s presences, and a simulation system for L-Rad is established accordingly. Several RFI cases are simulated with different RFI types, parameters, and positions; and the RFI characteristics upon L-Rad’s measurement are discussed. The proposed simulation system will be further dedicated to the design of RFI processing strategy onboard MICAP.
Highlights
Comparing the results shown in different columns, it can be found that the reconstructed brightness temperature of the sub-band without radio frequency interference (RFI) will not be affected by RFI
If the interference to noise power ratio (INR) of RFI located within alias-free field of view (AF-FOV) is smaller than −52 dB, that is, the RFI transmitted power of RFI on the ground is smaller than −0.13 dBm, the Root-meansquare error (RMSE) is smaller than 1.2 K (3 times STD), and the impact of RFI
This paper presents an instrumental full-chain time-domain simulation system of Microwave Imager Combined Active and Passive (MICAP) L-band one-dimensional synthetic aperture radiometer (L-Rad)
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. SMAP is the first mission to include a complex digital backend in spaceborn microwave radiometer system, which enables additional RFI detection and mitigation capabilities in spectral and statistical domain, together with on-ground processing [22,23]. The simulation for synthetic aperture radiometers is based on the Fourier relationship between the brightness temperature and visibility function [28,29] This kind of simulation is not suitable for RFI study, since it does not have the capability to depict the temperal and spectral features of different RFI signals. To study how RFI affects the data products of MICAP L-Rad and design in-orbit RFI detection and mitigation methods, a time-domain simulation system that emulates entire receiving chain of MICAP L-Rad is proposed . SST and WS are used to improve the accuracy of SSS retrieval
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