CubeSat Altimeter Constellation Systems: Performance Analysis and Methodology

Li, Yuanhao; Hoogeboom, P.; López-Dekker, Paco; Mok, Sung Hoon; Guo, Jian; Buck, Christopher

doi:10.1109/tgrs.2021.3100850

Cited by 2 publications

(3 citation statements)

References 51 publications

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“…In this work we write the natural logarithm of the likelihood function in the following form: (15) where k t d → r is a coefficient, the derivative of which depends on the information parameter; W u t 1 , t 2 , t d → r is a function, which is the inverse of the correlation function (14) and is found from the solution of the inversion equation…”

Section: Methodsmentioning

confidence: 99%

“…For example, laser radiation is used and processed in lidar systems [5][6][7], there are also systems that use telecommunication signals [8,9], nonlinear algorithms for a movement trajectory processing [10][11][12], etc. Traditionally, the most reliable are radio altimeters [13][14][15], which work in the radio range of waves, which allows one to receive the necessary information regardless of the current time of day, weather conditions, and are completely autonomous. Such systems can be implemented according to different schemes, but they all have some common features, such as the use of pulsed or continuous deterministic narrowband probing signals, which limits their potential technical characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

et al. 2022

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Radio altimeters are an important component of modern helicopter on-board systems. These devices currently involve the use of narrowband deterministic signals, that limits their potential technical characteristics. Given the significant breakthrough in the development of wideband and ultra-wideband radio electronics, it is promising to create on-board radio complexes capable of obtaining the necessary information using wideband stochastic signals. At the same time, when developing such complexes, it is important to use optimal synthesis methods for radio systems, which will allow optimal signal processing algorithms and potential accuracy parameters to be obtained. In this work, the algorithm to measure flight altitude for a helicopter or an unmanned aerial vehicle based on the processing of wideband and ultra-wideband pulsed stochastic signals is synthesized for the first time by the maximum-likelihood method. When formulating the problem, the mathematical model of the signal and observation is specified, and their statistical characteristics are investigated. The peculiarity of the synthesis task is the use of a noise pulse transmitter, which implements the function of an underlying surface illuminator, as well as considering the signal structure destruction during its radiation, propagation, and reflection. This signal shape destruction makes it impossible to synthesize a radar with internally coherent processing when working on one receiving antenna. In accordance with the synthesized algorithm, a simulation model of a pulsed radar with a stochastic probing signal has been developed and the results of its modeling are presented.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

et al. 2022

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“…The altimetry missions are usually designed in tandem (Donlon et al, 2012;Clerc et al, 2020;Frery et al, 2020;Mertikas et al, 2020) or constellation (Li et al, 2022). Currently, over one wide-swath altimetry missions have been planned around the world.…”

Section: Introductionmentioning

confidence: 99%

Overlapping-calibration of wide-swath altimeter baseline errors using two satellites formation flying design

Wang

Gao

et al. 2022

Front. Mar. Sci.

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The sea surface height (SSH) measured by future wide-swath altimetry satellites contains observation error due to baseline measurement, which is called SSH_Error_Baseline. It is a huge challenge for satellite engineering to maintain such high accuracies of the baseline roll and length in orbit to ensure that the SSH_Error_Baseline can be maintained below 1 cm. Therefore, how to effectively reduce the SSH_Error_Baseline is extremely important. In order to solve the existing problem, an innovative overlapping-calibration method is proposed based on two-satellite formation flight design with overlapping swath. In this study, the differences of SSH data observed by these two satellites in the overlapping area is so small that it can be ignored, and the SSH_Error_Baseline dominates the difference. Then, the baseline parameters of the two satellites can be well estimated by adopting an optimal inverse method. A total of 9 groups of observing system simulation experiments (OSSEs) have been carried out, and they respectively indicate different pessimistic theoretical scenarios of baseline measurement systems. According to the results, this design can effectively reduce the SSH_Error_Baseline in most scenarios. Regarding the advantage of this method, it can be applied to all along-track observation data without requiring the application of additional auxiliary data (i.e. model data, SSH derived from nadir altimetry). Therefore, when two wide-swath altimetry satellites are simultaneously designed, the formation flight scheme proposed in this paper is recommended, especially when the measurements of the baseline cannot meet the expected accuracies.

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CubeSat Altimeter Constellation Systems: Performance Analysis and Methodology

Cited by 2 publications

References 51 publications

Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

Signal Processing Algorithm for Monopulse Noise Noncoherent Wideband Helicopter Altitude Radar

Overlapping-calibration of wide-swath altimeter baseline errors using two satellites formation flying design

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