Degradation of GPS performance in geomagnetically disturbed conditions

Afraimovich, É. L.; Demyanov, V. V.; Kondakova, T. N.

doi:10.1007/s10291-003-0053-7

Cited by 36 publications

(21 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, the positioning accuracy, which is the main parameter of the quality of operation of the GPS system [16,17], is significantly impaired. It was shown in [11][12][13][14][15][16][17][18] that the phase slips result from scattering of GPS signals by the ionospheric irregularities with characteristic scales about the first Fresnel-zone radius (150-300 m) [34]. As a result, the signal amplitude can for some time decrease below the noise level, which leads to the loss of the signal and the slips in phase measurements.…”

Section: Spatio-temporal Distribution Of the Intensity Of Small-scalementioning

confidence: 99%

“…Interest in SSIs is related to the fact that they are associated with the F -spread phenomenon in short waves and scintillations of radio signals of the Earth satellites in meter and decimeter ranges of wavelengths (in particular, GPS signals), which impair the efficiency of satellite radio systems [11][12][13][14][15][16][17][18]. The diagnostics of such irregularities is of great interest for the solution of the problem of earthquake prediction [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generation of ionospheric irregularities upon propagation of solitary internal gravity wave during the major magnetic storm of October 29–31, 2003

Afraimovich

Astafieva

Voeykov

2006

Radiophys Quantum Electron

View full text Add to dashboard Cite

550.388.2 Using the technique of global detection of ionospheric disturbances, based on processing the data of the global GPS-receiver network, we obtain experimental proof of the existence of a solitary wave (soliton) in the atmosphere during the main phase of the major magnetic storm of October 30, 2003. The soliton with a characteristic duration of about 40 min and a relative amplitude of up to 40%, originated at the moment of the maximum disturbance of the Earth's magnetic field, traveled without changing its shape at a distance of up to 4500 km with a velocity of 1400 m/s, which exceeded the atmospheric sound velocity at the heights of the main electron-density maximum in the ionosphere (about 300 km) by a factor of 1.5. The intensity of variations in the total electron content in the period range 1-10 min increases by an order of magnitude as the soliton propagates from the North-East to the South-West of the USA in the regions with the maximum amplitude of the large-scale disturbance. This corresponds to enhancement of ionospheric irregularities with scales from 10 to 100 km, and also of small-scale irregularities (SSI) with scales of 100 to 1000 m, since the spectrum of the ionospheric irregularities has a power-law shape. Spatiotemporal characteristics of the density distribution of phase slips of GPS signals are close to the corresponding characteristics of the SSI intensity. This agrees with the existing concept that the phase slips result from scattering of GPS radio signals by SSIs. Both the SSI amplitude and the density of phase slips decrease as the soliton decays in amplitude.

show abstract

Section: Spatio-temporal Distribution Of the Intensity Of Small-scalementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation of ionospheric irregularities upon propagation of solitary internal gravity wave during the major magnetic storm of October 29–31, 2003

Afraimovich

Astafieva

Voeykov

2006

Radiophys Quantum Electron

View full text Add to dashboard Cite

show abstract

“…And for semicodeless receiver, semicodeless L2 tracking is typically aided by L1 measurements for the purpose to eliminate excess noise, the L2 phase‐lock‐loop employs a narrower bandwidth (≈1Hz for L2, 15Hz for L1) [ Woo , 1999]. These configurations cause that the L2 is more susceptible to the loss of lock due to ionospheric irregularities that was verified by some authors [ Afraimovich et al , 2003; Skone and de Jong , 2000]. Figure 1 gives the distribution of the daily accumulated cycle slip occurrence at L1 and L2 frequency obtained from XIAM observations in 2001.…”

Section: Methods and Datamentioning

confidence: 99%

Solar cycle variation of the GPS cycle slip occurrence in China low-latitude region

et al. 2010

View full text Add to dashboard Cite

Using the Global Positioning System (GPS) cycle slip data detected from the observations of two GPS stations over China low‐latitude region from 1999 to 2005, the solar cycle variation of cycle slip occurrence is studied. It is found that the cycle slip occurrence in these two stations varies with solar cycle and shows good temporal correlation; the cycle slip occurs in solar maximum years (1999–2002) much more frequently than that in solar minimum years (2003–2005). In solar maximum years, the seasonal and diurnal dependences of cycle slip occurrence are obvious as shown by previous studies; that is, for seasonal dependence cycle slip mainly occurs in the equinox months and for diurnal dependence cycle slip mainly occurs from 1900 LT to midnight. In solar minimum years, the similar diurnal dependence of cycle slip still exists, nevertheless, the seasonal dependence of cycle slip is not obvious due to small cycle slip occurrence. In the meantime, the spread F occurrence also shows seasonal and diurnal dependence, but there are some differences compared with cycle slip occurrence. During the period from 2000 to 2002, the Q‐type spread F mainly occurs in the equinox months; from 2003 to 2005, the Q‐type spread F occurs mainly in summer months. As for the diurnal distribution, the Q‐type spread F mainly occurs from 2000 LT to sunrise time and lasts much longer than the cycle slip does, and the F‐type spread F mainly occurs after midnight and is very different with the cycle slip occurrence. Considering the reasons for cycle slip phenomenon in GPS observations, it is thought that the statistical results of cycle slip occurrence with solar cycle, season, and local time just reflect the temporal distribution of the ionospheric irregularities above a certain intense level over the observing region.

show abstract

“…During geomagnetic disturbances in near space, deterioration of GNSS operation quality appeared and, as a consequence, a reduction of positioning accuracy and the occurrence of subsequent failures, in ground-based users' coordinates have been observed [24]. Aarons shows that the main degradation comes from the systematic ionospheric effects of radio wave propagation: the group and phase delay and the frequency Doppler shift.…”

Section: Summary and Discussionmentioning

confidence: 99%

Effect of TEC Variation on GPS Precise Point at Low Latitude

Tiwari¹,

Bhattacharya²,

Purohit³

et al. 2009

TOASCJ

View full text Add to dashboard Cite

Abstract:The ionosphere is a dispersive medium of charged particles between the satellite and the user on Earth. These dispersive ionized media play a vital role in the various applications of GPS (Global Positioning Systems) because the ionosphere directly influences transionospheric radio waves propagating from the satellite to the receiver. Solar flares affect the ionization state of the ionosphere with their high intensity. Sometimes the intensity is so severe that it accelerates the rate of ionization, resulting in ionospheric storms; during the ionospheric storms the concentration of charged particles varies. Among the various phenomena in the ionosphere, TEC (Total Electron Content) is responsible for range error which produces a time delay in the radio signal. The rate of change of TEC with respect to time is abbreviated as ROT. It is one of the parameters that express the ionospheric irregularities with respect to time. This work investigates the effect of ROT fluctuation on the precise positioning of GPS receivers during low solar activity periods in the equatorial anomaly region. Good geometry and a sufficient number of locked satellites provide more accuracy within the centimeter level, but the case may be different when there are any ionospheric storms. Even a few satellite signals passing through the ionospheric irregularities can cause a significant error in positioning. Thus, it is important to understand the ionospheric irregularities observed by GPS receivers in order to correct them. The ROT (TEC/Minute) parameter is used here to study the occurrence of TEC fluctuation and its potential effect on GPS, such as a horizontal positional error or the satellite geometry of the GPS receiver. This investigation is based on the analysis of a one-year observation of a fixed GPS receiver installed at Bhopal (23.202 0 N, 77.452 0 E), India during low solar active period in 2005. The GPS receiver used here is a GISTM-based dual frequency NovAtel OEM4 GPS receiver.

show abstract

Degradation of GPS performance in geomagnetically disturbed conditions

Cited by 36 publications

References 24 publications

Generation of ionospheric irregularities upon propagation of solitary internal gravity wave during the major magnetic storm of October 29–31, 2003

Generation of ionospheric irregularities upon propagation of solitary internal gravity wave during the major magnetic storm of October 29–31, 2003

Solar cycle variation of the GPS cycle slip occurrence in China low-latitude region

Effect of TEC Variation on GPS Precise Point at Low Latitude

Contact Info

Product

Resources

About