Spacecraft transponder for deep space applications: Design and performance

Simone, L.; Comparini, M.C.; Marchetti, F.; D'Attilia, M.; Cocchi, S.; Delfino, M.; Delfino, Antonio; Basile, G.; Tiberis, F. De; Boscagli, G.

doi:10.1109/aero.2002.1035266

Cited by 7 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…( 7) retrieves a signal with phase continuously equal to the kernel's [28], and coherent tracking means the onboard LO tracks the uplink in phase. This was ensured by a frequency tracking loop and "dedicated signal processing" on Rosetta [62] and traditional analog phase locked loops on NASA spacecraft [63] till Cassini [29]. The anomalous tracking data in NEAR and Rosetta (2005) flybys together comprise about 20 million Doppler and range measurements at the 0.1 s Doppler count interval.…”

Section: Observations With Coherent Dopplermentioning

confidence: 99%

See 1 more Smart Citation

Parametric separation of variables and the complete propagation law

Guruprasad¹

2022

Preprint

View full text Add to dashboard Cite

Solving partial differential equations by separation of variables is historically thought to require equating the parts to a constant. Shown, with robust observational support, is that equating to a function of time yields a dimension of novel solutions to the wave equation. They transform known solutions in time, represent Doppler with acceleration, and correct wave idealizations that wrongly constrained fundamental physics, as well as communication and spectrum use. This is a draft version meant to time-stamp & share for comments mainly the following: <ul> <li>discovery of incompleteness of Fourier's method and the full separation of variables for the wave equation (Section 2, Appendices A, B);</li> <li>discovery of Green's function wave solutions with intrinsic phase acceleration and expansion (Section 3);</li> <li>first explanation of the range data lags in the flyby anomalies (Sections 4, 5 and Appendix C);</li> <li>elegant proof of redundancy of quantization postulate (improving over arXiv:1602.04136, Appendix D); and</li> <li>possible redundancy of speed of light postulate over variable measuring rods and clocks (Section 7 conclusion).</li> </ul> An equivalence principle between true acceleration in Doppler and uplink transmitter frequency ramp appears already implied by the similarity of the anomalies with ramping (NEAR) and without (Rosetta 2005). Experimental verification is being planned, to be performed in a proposed prototype of an acceleration spectrum receiver under funding review.

show abstract

Section: Observations With Coherent Dopplermentioning

confidence: 99%

“…A ramping LO, whether due to phase lock as on Galileo and NEAR [63] or by "dedicated signal processing" as on Rosetta [62], instead leads to the corresponding pair…”

Section: Coherent and Non-coherent Reception In Trackingmentioning

confidence: 99%

Parametric separation of variables and the complete propagation law

Guruprasad¹

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…( 7) retrieves a signal with phase continuously equal to the kernel's [28], and coherent tracking means the onboard LO tracks the uplink in phase. This was ensured by a frequency tracking loop and "dedicated signal processing" on Rosetta [62] and traditional analog phase locked loops on NASA spacecraft [63] till Cassini [29]. The anomalous tracking data in NEAR and Rosetta (2005) flybys together comprise about 200, 000 Doppler and range measurements at the 10 s Doppler count interval.…”

Section: • the Similarity Of Acceleration Spectra Of Arbitrary Signal...mentioning

confidence: 99%

“…The first approximates the total Doppler by e β [ ti −τ ] , for instant ti ∈ (t i − T /2, t i + T /2) according to the mean value theorem. Both amplitudes are small, but since the carrier acquisition starts at the ordinary Doppler in a Fourier spectrum determined by a fast Fourier transform (FFT) [12,13,29,62,112], the signal gets acquired in the Fourier spectrum (first of eqs. 13) with no shift to cause the anomaly.…”

Section: Coherent and Non-coherent Reception In Trackingmentioning

confidence: 99%

Parametric separation of variables and the complete propagation law

Guruprasad¹

2022

Preprint

View full text Add to dashboard Cite

Solving partial differential equations by separation of variables is historically thought to require equating the parts to a constant. Shown, with robust observational support, is that equating to a function of time yields a dimension of novel solutions to the wave equation. They transform known solutions in time, represent Doppler with acceleration, and correct wave idealizations that wrongly constrained fundamental physics, as well as communication and spectrum use. This is a draft version meant to time-stamp & share for comments mainly the following: <ul> <li>discovery of incompleteness of Fourier's method and the full separation of variables for the wave equation (Section 2, Appendices A, B);</li> <li>discovery of Green's function wave solutions with intrinsic phase acceleration and expansion (Section 3);</li> <li>first explanation of the range data lags in the flyby anomalies (Sections 4, 5 and Appendix C);</li> <li>elegant proof of redundancy of quantization postulate (improving over arXiv:1602.04136, Appendix D); and</li> <li>possible redundancy of speed of light postulate over variable measuring rods and clocks (Section 7 conclusion).</li> </ul> An equivalence principle between true acceleration in Doppler and uplink transmitter frequency ramp appears already implied by the similarity of the anomalies with ramping (NEAR) and without (Rosetta 2005). This revision corrects the volume of tracking data that was involved in the NASA/ESA trajectory analyses (pp 10,11).

show abstract

“…This resampling feature simplifies the use of sample rates which are not coherently related to the input data rate, thus decoupling the camer from the data clock [6]. This approach greatly improves previous design [7], being avoided any constraint in the' CDS synchronization. The proposed approaches allows to enhance the down-link modulation capabilities of the cwent transponders due to digital design flexibility and they have to be traded-off on the basis of the system requirements and according to the spacecraft interfaces.…”

Section: Architectural Trade-offsmentioning

confidence: 98%

Novel digital platform for deep space transponders: the transmitter side

Simone

Gelfiisa

Cocchi

et al.

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)

Self Cite

View full text Add to dashboard Cite

Aim of the paper is to present a novel digital platform for the transmitting side (NDP-Tx) of a deep space transponder which has been developed by Alenia Spazio in the frame of the ESA study on "Digital Techniques for TT&C Transponder" [I]. The proposed design has unique features in terms of flexibility and interfacing with the spacecraft Command Data Sub-System (CDS). The NDP-Tx supports standard telemetry modulation formats based on residual carrier and more advanced schemes aiming to improve the space-to-earth link performance. In fact, in case of limited available power, as for satellite transmitters, the power efficiency is maximised driving the power amplifier in saturation, i.e. in the non-linear region of its transfer characteristic. Using constant (i.e. GMSK) or quasi-constant (i.e. Square-Root Raised Cosine SRRC-Filtered OQPSK) envelope modulation allows the transmitter stage to operate in saturation without the drawback of the non-linear distortion (i.e. adjacent channel interference due to sidelobes spreading and regeneration).

show abstract

Spacecraft transponder for deep space applications: Design and performance

Cited by 7 publications

References 2 publications

Parametric separation of variables and the complete propagation law

Parametric separation of variables and the complete propagation law

Parametric separation of variables and the complete propagation law

Novel digital platform for deep space transponders: the transmitter side

Contact Info

Product

Resources

About