Phased-array antenna system for the MESSENGER deep space mission

Wallis, R.E.; Cheng, Sheng

doi:10.1109/aero.2001.931694

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Phased arrays are currently used in a variety of applications. For example, the MESSENGER spacecraft (mission to the planet Mercury arrived 18 March 2011) was the first deepspace mission with a phased-array antenna for communications 29 . Potentially, spin wave interferometers can be arranged in a magnetic telescope for the outer space exploration.…”

Section: Discussionmentioning

confidence: 99%

A Magnetometer Based on a Spin Wave Interferometer

Balinskiy

Montes

Chiang

et al. 2017

Sci Rep

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We describe a magnetic field sensor based on a spin wave interferometer. Its sensing element consists of a magnetic cross junction with four micro-antennas fabricated at the edges. Two of these antennas are used for spin wave excitation while two other antennas are used for detection of the inductive voltage produced by the interfering spin waves. Two waves propagating in the orthogonal arms of the cross may accumulate significantly different phase shifts depending on the magnitude and direction of the external magnetic field. This phenomenon is utilized for magnetic field sensing. The sensitivity attains its maximum under the destructive interference condition, where a small change in the external magnetic field results in a drastic increase of the inductive voltage, as well as in the change of the output phase. We report experimental data obtained for a micrometer scale Y3Fe2(FeO4)3 cross structure. The change of the inductive voltage near the destructive interference point exceeds 40 dB per 1 Oe. The phase of the output signal exhibits a π-phase shift within 1 Oe. The data are collected at room temperature. Taking into account the low thermal noise in ferrite structures, we estimate that the maximum sensitivity of the spin wave magnetometer may exceed attotesla.

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Section: Discussionmentioning

confidence: 99%

A Magnetometer Based on a Spin Wave Interferometer

Balinskiy

Montes

Chiang

et al. 2017

Sci Rep

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“…Therefore, combining Eqs. (29) and (35)-(41) yields the analytical solutions to the linearized relative motions. Figure 10 is the comparison between the numerical solutions and analytical solutions, which confirms that Eqs.…”

Section: δρmentioning

confidence: 99%

“…In antenna theory, a phased array usually means an electronically scanned array that creates a beam of radio waves and electronically steers waves to point in different directions, without moving the antennas. 29 For the space-based phased array antenna mission, two basic requirements exist for the configuration geometry of the array antennas. The first requirement is to provide the repeating petal-like ground tracks on the y o -z o plane to revisit the surveillance area, and the second requirement is to assign numerous array antennas in a neat and regular manner.…”

Section: Repeating Relative Ground Tracks For Phased Array Antenna MImentioning

confidence: 99%

Distributed situational observer in a displaced orbit: relative dynamics and control

Pan

2018

J. Astron. Telesc. Instrum. Syst.

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We design a distributed situational observer using formation flying in a displaced orbit. The main focus of our investigation is the relative dynamics and control of displaced orbits obtained by low-thrust propulsion. The spatial dynamics in Newtonian form are used to derive the numerical relative motions, and their natural frequencies discovered by eigenvalue decomposition separate from each other at a critical height that differentiates the structural stability, bifurcation, and instability. Using the Jordan decomposition, six fundamental motions are achieved, including the stationary multiequilibria, the periodic oscillations that correspond to the natural frequencies, and the maximum leaving or approaching velocity caused by the different geometric and algebraic multiplicities. Off-axis equilibrium is obtained by a proposed open-loop control, and the motions nearby are proven to be equivalent to the numerical relative motions. The reduced dynamics in Hamiltonian form are used to derive the analytical solutions for linearized relative motions. Bounded relative trajectories with arbitrary initial values are achieved by two extraclosed-loop controls. Using the off-axis equilibrium and resonance of natural frequencies, the applications of a fixed relative baseline vector for interferometric SAR or Fresnel zone lens missions and repeating relative ground tracks for a phased array antenna mission are addressed in terms of the trajectory design. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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