Tripulse: A system for determining orientation and attitude of a satellite borne active phased array

Silverstein, S.D.; Ashe, Jeffrey; Kautz, G.M.; Wheeler, Floyd J.; Jacomb-Hood, A.

doi:10.1109/7.993224

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…The propagation loss L p has no influence on the channel mismatch. The values of {φ v | v = 1, 2, · · · , V } are assumed to be known a priori because in practice these parameters can be obtained by telemetry systems [24]. Based these observations, we can let L p = 1 and {φ v = 0|v = 1, 2, · · · , V } in (1) for mathematical convenience, and thus a much neater form of (1) can be achieved…”

Section: System Modelmentioning

confidence: 99%

“…While for CSmS-NOMA, an extra ZF equalizer is required. With the calibration results and their preset true values at hand, we may compute empirical RMSEs following (24) and (25), by replacing the mathematical expectation therein with arithmetic average. To obtain each empirical result reported in the next section, 10 4 independent experiments are carried out.…”

Section: Hardware Platformmentioning

confidence: 99%

“…} are assumed to be known a priori because in practice these parameters can be obtained by telemetry systems [24]. Based these observations, we can let L p = 1 and…”

Section: System Modelmentioning

confidence: 99%

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NOMA-Based Calibration for Large-Scale Spaceborne Antenna Arrays

Lin

Wang

et al. 2018

IEEE Trans. Veh. Technol.

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Abstract-In the parallel calibration for transmitting phased arrays, the calibration receiver must separate the signals belonging to different antenna elements to avoid mutual interference. Existing algorithms encode different antenna elements' radiation with orthogonal signature codes, but these algorithms are far from desired for large-scale spaceborne antenna arrays. Considering the strictly limited resources on satellites, to improve hardware efficiency of large-scale spaceborne antenna arrays, in this work inspired by the idea of non-orthogonal multiple access (NOMA) we design a series of non-orthogonal signature codes for different antenna elements by Cyclically Shifting an m-Sequence (CSmS) with different offsets named as CSmS-NOMA signaling. This design can strike an elegant balance between the performance and complexity and is very suitable for large-scale spaceborne antenna arrays. It is shown that no matter how many antenna elements there are to be calibrated simultaneously, CSmS-NOMA signaling needs only one calibrating waveform generator and one matched filter. Hence it is much more efficient than the existing fully orthogonal schemes. In order to evaluate the achievable calibration accuracy, a unified theoretical framework is developed based on which the relationship between calibration accuracy and signal to noise ratio (SNR) has been clearly revealed. Furthermore, a hardware experiment platform is also built to assess the theoretical work. For all the considered scenarios, it can be concluded that the theoretical, simulated and experimental results coincide with each other perfectly.

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Section: System Modelmentioning

confidence: 99%

Section: Hardware Platformmentioning

confidence: 99%

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NOMA-Based Calibration for Large-Scale Spaceborne Antenna Arrays

Lin

Wang

et al. 2018

IEEE Trans. Veh. Technol.

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“…This phenomenon not only affects the resolution and pointing accuracy of payloads such as cameras but also affects the attitude control of satellites [6]. The spaceborne data transmission antenna plays an important role in spacecraft data relay and intersatellite link tasks, but it is also the main source of low-frequency microvibration [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experimental Study on Dynamic Behavior of Stepper-Actuated Dual-Axis Data Transmission Antenna

Zheng

Cheng

et al. 2021

International Journal of Aerospace Engineering

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The satellite-borne data transmission antenna is the main disturbing source of low-frequency microvibration of spacecraft, which immensely affects the image quality of remote sensing satellite. In this paper, the dynamic characteristics of flexible load driven by stepping motor on flexible boundary are studied. The dynamic equation of the stepping motor driven by current subdivision is simplified by linearization method. The dynamic model of flexible load driven by stepping motors on flexible boundary is established by using the Dynamic Substructure Method, and the analytical expression of microvibration of the data transmission antenna is given. The coupling relationship between the stepping motors and the flexible structure is analyzed by modal coordinate transformation. The microvibration model is verified by simulation and experiment, and the main causes and coupling factors of microvibration are explained. The results show that the model can accurately predict the microvibration of the satellite antenna and can be applied to the microvibration prediction in orbit. The reasonable selection of the working velocity of the stepping motors can effectively reduce the microvibration, which provides the basis for the design of the antenna control system.

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