The high-resolution spectrum estimator—A subjective entity

Kay, S.; Demeure, C.J.

doi:10.1109/proc.1984.13091

Cited by 26 publications

(9 citation statements)

References 4 publications

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“…Further, to obtain the period of the daytime periodic wave‐like structures, a fast Fourier transform with a 64‐min running window is applied. The weighted Fourier transform method described by Kay and Demeure () is used to remove the effects of spectrum density discontinuities in a period. As shown in the right panels of Figure , the periods of the periodic wave‐like structures are approximately 25 min on average for these stations.…”

Section: Observationsmentioning

confidence: 99%

Daytime Periodic Wave‐like Structures in the Ionosphere Observed at Low Latitudes over the Asian‐Australian Sector Using Total Electron Content from Beidou Geostationary Satellites

et al. 2019

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Daytime periodic wave-like structures are statistically analyzed for the first time in the low-latitude ionosphere over the Asian-Australian sector using total electron content from Beidou geostationary satellites during 2016-2017. These structures have periods of about 18-28 min, which frequently occur during 11:00-17:00 local time in the winter at latitudes ranging between 17 and 25°N (10-18°N magnetic latitude [MLAT]) in the Northern Hemisphere, where they have a maximum occurrence rate of 80% at~21°N (14°N MLAT). In the Southern Hemisphere, daytime periodic wave-like structures are also observed during 11:00-15:00 local time in the winter within latitudes ranging between 6.0 and 11.1°S (15.4-21.6°S MLAT), although the peak occurrence rate is only approximately 40%. Compared with stratospheric gravity waves (GWs), the seasonal and latitudinal variations of daytime periodic wave-like structures are generally consistent with those of stratospheric GWs. This gives a possible argument that daytime periodic wave-like structures in the low-latitude ionosphere could be generated in the low-latitude ionosphere and triggered by GWs from the lower atmosphere.

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Section: Observationsmentioning

confidence: 99%

Daytime Periodic Wave‐like Structures in the Ionosphere Observed at Low Latitudes over the Asian‐Australian Sector Using Total Electron Content from Beidou Geostationary Satellites

et al. 2019

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“…Possible examples are bo = 1 [monic b(z)], llbll = 1, etc. The constraint set e,., r = 1, , 4 is chosen to complete the correspondence to the respective constraint on h of Section 11, whose use to constrain the minimization in (23) or 25is part of the ML formulation, and is essential for optimality, as follows: a) 8, 2 ( b : b(z) has roots inside or on the unit circle), (28) Note that (28b) no longer holds in general if b(z) is forced to be monic. Accordingly, we avoid the latter constraint in the case of pure complex sinusoids.…”

Section: Claimmentioning

confidence: 99%

“…The use of constraints such as in (28) iin particular, (28d) for real sinusoids] has been suggested previously (cf.…”

Section: Constraint Sets and "High Resolution"mentioning

confidence: 99%

Exact maximum likelihood parameter estimation of superimposed exponential signals in noise

Bresler

Macovski

1986

IEEE Trans. Acoust., Speech, Signal Process.

681

336

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gorithm for the maximization of this criterion is presented. The algorithm is equally applicable in the case of signal coherence in the array problem. Simulation shows the estimator to be capable of providing more accurate frequency estimates than currently existing techniques. The algorithm is similar to those independently derived by Kumaresan et aE. In addition to its practical value, the present formulation is used to interpret previous methods such as Prony's, Pisarenko's, and modifications thereof.

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“…In addition he investigates the example case using both MUSIC and alternative techniques, namely conventional beamforming, maximum likelihood and maximum entropy. We also point out the comment by Kay and Demeure (1984) …”

Section: Application Of Music Algorithm To a Three Antenna Compact Rmentioning

confidence: 80%

“…For CS, the relative disadvantages are the lower SNR and larger processing load. We were unable to assess the side lobe levels for CS, but note that the sharpness of a peak marking the estimate of time delay or Doppler shift is not an indication of the resolution of the technique as pointed out by Kay and Demeure (1984) [30].…”

Section: • Response To Excess Targets (> K)mentioning

confidence: 99%

Compressive Sensing for DoD Sensor Systems

Gregg¹

2012

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The high-resolution spectrum estimator—A subjective entity

Cited by 26 publications

References 4 publications

Daytime Periodic Wave‐like Structures in the Ionosphere Observed at Low Latitudes over the Asian‐Australian Sector Using Total Electron Content from Beidou Geostationary Satellites

Daytime Periodic Wave‐like Structures in the Ionosphere Observed at Low Latitudes over the Asian‐Australian Sector Using Total Electron Content from Beidou Geostationary Satellites

Exact maximum likelihood parameter estimation of superimposed exponential signals in noise

Compressive Sensing for DoD Sensor Systems

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