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The PARIS Ocean Altimeter In-Orbit Demonstrator

The PARIS Ocean Altimeter In-Orbit Demonstrator,10.1109/TGRS.2010.2092431,IEEE Transactions on Geoscience and Remote Sensing,Manuel Martín-Neira,Salva

The PARIS Ocean Altimeter In-Orbit Demonstrator   (Citations: 7)
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Mesoscale ocean altimetry remains a challenge in satellite remote sensing. Conventional nadir-looking radar al- timeters can make observations only along the satellite ground track, and many of them are needed to sample the sea surface at the required spatial and temporal resolutions. The Passive Reflectometry and Interferometry System (PARIS) using Global Navigation Satellite Systems (GNSS) reflected signals was pro- posed as a means to perform ocean altimetry along several tracks simultaneously spread over a wide swath. The bandwidth lim- itation of the GNSS signals and the large ionospheric delay at L-band are however issues which deserve careful attention in the design and performance of a PARIS ocean altimeter. This paper describes such an instrument specially conceived to fully exploit the GNSS signals for best altimetric performance and to provide multifrequency observations to correct for the ionospheric delay. Furthermore, an in-orbit demonstration mission that would prove the expected altimetric accuracy suited for mesoscale ocean science is proposed.
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    • ...As GNSS-R systems are bistatic systems, this tilt requires a beamforming system to be implemented, which is already being considered in planned space missions such as in [14]...
    • ...squares (CLS) filter has been chosen as in [14]...

    Enric Valenciaet al. Ocean Surface's Scattering Coefficient Retrieval by Delay–Doppler Map ...

    • ...Recent GNSS-R studies have yielded promising results on various applications, mainly for ocean monitoring as an altimeter [1], and as a scatterometer [2-5]...

    Hyuk Parket al. New approach to sea surface wind retrieval from GNSS-R measurements

    • ...In [4] a value of 4.5 dB for the SNR is provided...
    • ...To relate it to the final interferometric SNR, Eqn. 4 in [4] has to be used:...
    • ...<{[SECTION]}>D . According to Eqn. 4 in [4], for the...

    Adriano Campset al. Preliminary error budget of a GNSS-R spaceborne mission

    • ...In order to maximize the altimetry performance achievable with the PARIS technique, in the recent years a novel instrument configuration has been proposed, which is specifically conceived to fully exploit the GNSS signals for best altimetry performance and to provide multi-frequency observations to correct for the ionospheric delay [2]...
    • ...This instrument has been referred to as the PARIS IoD altimeter [2]...
    • ...The signal to thermal noise ratio (SNR) at the output of the cross-correlator can be approximated as [2]:...
    • ...P the value and the first derivative of the average power waveform on the specular point (located on the leading edge), the standard deviation of the estimated sea surface height h V can be then expressed as [2]:...

    Salvatore D'Addioet al. End-to-end performance analysis of a paris in-orbit demostrator ocean ...

    • ...In order to overcome this problem, a solution was devised in [4] that consists of cross-correlating the direct and reflected signals among them...
    • ...Either if the GNSS-reflectometer topology is based on the cross-correlation with a local replica of the transmitted signal as in [1], or it is based on the cross-correlation of the direct and reflected signals as in [4], an active array is needed at least for the down-looking antenna...
    • ...Yf W by the PARIS In Orbit Demonstrator arrays [4] is obtained by cross-correlating direct vs. reflected signals...
    • ...• Finally, the delay calibration approach described in [4] is ONLY valid if the above-mentioned point holds (receivers have matched frequency responses)...
    • ...In this work the response of an interferometric array such as the one proposed in [4] for altimetry applications by crosscorrelating the direct and reflected GNSS signals is presented...

    Adriano Campset al. Impact of receiver's frequency response in GNSS reflectometers

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