Milton Friedman’s “If you put the federal government in charge of the Sahara Desert, in five years there’d be a shortage of sand” alludes to the fact that how it would become more efficient and agile if government-run projects were fully operated by privately-run teams. This liberal attitude has become a motivation for me to… More
Delay-Doppler Maps (DDMs) have already shown promising potentials in the sea ice remote sensing, including ice recognition and sea ice thickness estimation. However, this kind of products is yet to be tested for lake ice remote sensing, which looks more challenging than that of sea ice, especially for mid-latitude ones. Generally speaking, two main approaches… More
GNSS-R applications for lake ice remote sensing is still under study, and there are many vague points in this subject, especially for those like me who are “encore vert” in this topic. Among various corrections and calibrations must be made on GNSS-R data, EIRP looks decisive; however, a genius solution has been recently proposed for… More
How GNSS SNR Values Are Connected to Antenna Heights; the Geometry of SNR-Based GNSS Interferometric Reflectometry
You may know what formula I am talking about; one of the most famous formulas in GNSS reflectometry that magically links the reflected SNR values, satellite elevation angle, and the signal wavelength to the antenna height. I have created a short animated video to explain where this formula comes from. In October 19, 2020, at… More
How to Fund Smartphone-Based GNSS-R Observations for Lake Ice Remote Sensing; Cryptocurrencies may Help!
I got surprised to see this post, which was about smartphones potential for lake ice thickness measurement, has been circulated a lot and gained many views from different countries around the world. However, talking about this ideas through one-to-one discussions with my colleagues and friends, a question cropped up, which made me to write this… More
SNR-based GNSS-Reflectometry has shown an enormous potential for ground-based altimetry purposes as the frequency of SNR oscillations is directly connected to antenna height from the reflective surface. This technique, which is usually called in the literature as GNSS Interferometric Reflectometry, has been already tested for retrieving snow depth, monitoring water level changes, and measuring lake… More
Precipitation detection over ocean using various radar remote sensing techniques have been fully understood and tested for several decades. But in terms of GNSS Reflectometry, researchers had been skeptical about its potential as a rain detector. Recently, a groundbreaking paper has been published by Dr. Milad Asgarimehr and his colleagues addressing this question cropping up in another paper published three years… More
“Why talk to others when you can talk to yourself?” This is how Clara Chew captioned her fantastic YouTube video in LinkedIn to start suggesting a spatial interpolation method for CYGNSS data. First of all, I should say what a great idea form one of my most inspiring and favorite researchers. Establishing a YouTube channel… More
Our poster was presented on the first IAG’s conference-workshop on “Geodesy for Climate Research” which is currently (March 29-31, 2021) being held online. The idea of this poster, as can be understood from the title, was on examining the temperature effect on GNSS reflectometry over lake ice. During the freezing season of 2019-2020, a GNSS-R… More
To clarify a subject to non-specialists, creating a video is a much more efficient way compared to giving lectures, preparing graphs, and even writing plain language articles. Gradflix is a competition held each year at the University of Waterloo encouraging grad students to create 1-minute videos to explain their research topics. Then, based on a… More
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