Comparison of Radar Waveforms for a Low-Power Vertical-Incidence Ionosonde

Yao, Ming; Zhao, Zhengyu; Chen, Gang; Yang, Guobin; Su, Fanfan; Li, Shipeng; Zhang, Xinmiao

doi:10.1109/lgrs.2010.2043788

Cited by 17 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned in [6], [8], [13] and [27], ionosphere is an inhomogeneous and anisotropic region. The reflection from ionospheric layers occur over turning points and they do not resemble specular reflection.…”

Section: Discussion On the Optimization Strategy And Resultsmentioning

confidence: 93%

“…Similarly, while investigating dependency of IRI-Plas TEC estimates to , is taken as the default IRI-Plas daily average, for the selected location and day. Hence, for a given day the average frequency , and average daily TEC error are given by (8) and (9) respectively. Here, is given by (10) Here, is varied between 2 MHz and 9 MHz in steps of 1 MHz.…”

Section: Iri-plas Optimization Designmentioning

confidence: 99%

“…-layer models can be found in various studies including but not limited to [2]- [5]. The critical parameters of -layer can be estimated using ionosondes [6]- [8].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Estimation of $hmF2$ and $foF2$ Communication Parameters of Ionosphere $F2$-Layer Using GPS Data and IRI-Plas Model

Sezen

Sahin

Arıkan

et al. 2013

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

layer is the most important and characteristic layer of the ionosphere in the propagation of high frequency (HF) waves due to the highest level of conductivity in the propagation path. In this study, the relation of Total Electron Content (TEC) with the maximum ionization height and the critical frequency of-layer are investigated within their defined parametric range using the IRI model extended towards the plasmasphere (IRI-Plas). These two parameters are optimized using daily observed GPS-TEC (IONOLAB-TEC) in an iterational loop through Non-Linear Least Squares (NLSQ) optimization while keeping the physical correlation between and parameters. Optimization performance is examined for daily (24-hour) and hourly TEC optimizations separately. It is observed that hourly TEC optimization produces results with much smaller estimation errors. As a result of the hourly optimization, we obtain the hourly and estimates as they are the optimization parameters. Obtained and estimates are compared with the ionosonde estimates for various low, middle and high latitude locations for both quite and disturbed days of ionosphere. The results show that and estimates obtained from IRI-Plas optimization (IRI-Plas-Opt) and ionosonde are very much in agreement with each other. These results also signify that IRI-Plas provides a reliable background model for ionosphere. With the proposed method, it is possible to build a virtual ionosonde via optimization of IRI-Plas model using the observed TEC values.

show abstract

Section: Discussion On the Optimization Strategy And Resultsmentioning

confidence: 93%

Section: Iri-plas Optimization Designmentioning

confidence: 99%

See 1 more Smart Citation

Estimation of $hmF2$ and $foF2$ Communication Parameters of Ionosphere $F2$-Layer Using GPS Data and IRI-Plas Model

Sezen

Sahin

Arıkan

et al. 2013

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…Binary, biphase, or bipolar phase shift keying is a means to rapidly select between two preprogrammed 14‐bit output phase offsets that equally affect both I and Q outputs of the AD9854. The pulse compression technique using phase codes increases the SNR and range resolution for the low‐power transmission (Coll & Storey, ; Reinisch, ; Yao et al, ) as a long duration coded pulse contain the same energy content as a high power short duration pulse, and the received pulse can be compressed. Therefore, coherent integration and pulse compression are means of improving the SNR (Bianchi et al, ; Bibl, ; Reinisch, ; Morris et al, ).…”

Section: System Descriptionmentioning

confidence: 99%

SAMEERDU—Digital Ionosonde: Brief System Description and Initial Results from a Low‐Latitude Location Dibrugarh

et al. 2019

View full text Add to dashboard Cite

A digital ionosonde was designed and built by Society for Applied Microwave Electronics Engineering and Research (SAMEER), Mumbai in collaboration with Dibrugarh University to suit the needs of equatorial-and low-latitude regions of India. The design objectives were to obtain good signal-tonoise ratio to mitigate the heavy noise due to interference, obtain short duration ionograms, estimate vertical drifts, reconstruct vertical electron density profile, and make antenna size smaller. Transmission of maximum 1 kW power using modified delta antenna is used with dual channel magnetic loop receiver antenna. Pulse compression by 8-and 16-bit biphase codes are employed to increase noise immunity and the height resolution. The preliminary results of the ionogram mode only are presented in this work. The basic ionogram recorded by this system called SAMEER-Dibrugarh University Ionospheric Radar is compared with colocated Canadian Advanced Digital Ionosonde ionogram which is in operation in Dibrugarh since 2010. A reasonably clear trace of E and F layers is obtained even without coherent pulse integration and pulse coding. The performance of the coding schemes is investigated with and without coherent integration. Some sample ionospheric experiments conducted with SAMEER-Dibrugarh University Ionospheric Radar, and interesting results like the detection of travelling ionospheric disturbances, Es layer substructures, ionospheric irregularities, and the generation of bottom-side vertical electron density profile are presented to highlight the potential and capabilities of the system. Plain Language SummaryA new high-frequency sweeping radar or digital ionosonde was designed and developed by SAMEER, Mumbai in collaboration with Dibrugarh University. This type of radar is used for monitoring ionospheric conditions for high-frequency band and trans-ionospheric communications like Global Positioning System signals. Additionally, it has been one of the oldest but still relevant tool for research in the field of ionosphere.

show abstract

“…For example, it can be used to improve the predictions of the receiving area, usable frequency and the group-delay, distribution and therefore help to determine the suitability of the communication [1]. The critical frequency can be measured using vertical [5,6] and oblique incidence sounding ionosonde [7], global navigation satellite systems.…”

Section: Introductionmentioning

confidence: 99%

Simplified Regional Prediction Model of Long-Term Trend for Critical Frequency of Ionospheric F2 Region over East Asia

et al. 2019

View full text Add to dashboard Cite

To improve the accuracy of predictions and simplify the difficulty with the algorithm, a simplified empirical model is proposed in developing a long-term predictive approach in determining the ionosphere’s F2-layer critical frequency (foF2). The main distinctive features introduced in this model are: (1) Its vertical incidence sounding data, which were obtained from 18 ionosonde stations in east Asia between 1949 and 2017, used in reconstructing the model and verification; (2) the use of second-order polynomial and triangle harmonic functions, instead of linear ones, to obtain the relationship between the seasonal vs. solar-cycle variations of foF2 and solar activity parameters; (3) the flux of solar radio waves at 10.7 cm and sunspot number are together introduced in reconstructing the temporal characteristics of foF2; and (4) the use of the geomagnetic dip coordinates rather than geographic coordinates in reconstructing the spatial characteristics of foF2. The statistical results reveal that foF2 values calculated from the proposed model agree well with the trend in the monthly median statistical characteristics obtained from measurements. The results are better than those obtained from the International Reference Ionosphere model using both the CCIR and URSI coefficients. Furthermore, the proposed model has enabled some useful guidelines to be established for a more complete and accurate Asia regional or global model in the future.

show abstract

Comparison of Radar Waveforms for a Low-Power Vertical-Incidence Ionosonde

Cited by 17 publications

References 13 publications

Estimation of $hmF2$ and $foF2$ Communication Parameters of Ionosphere $F2$-Layer Using GPS Data and IRI-Plas Model

Estimation of $hmF2$ and $foF2$ Communication Parameters of Ionosphere $F2$-Layer Using GPS Data and IRI-Plas Model

SAMEERDU—Digital Ionosonde: Brief System Description and Initial Results from a Low‐Latitude Location Dibrugarh

Simplified Regional Prediction Model of Long-Term Trend for Critical Frequency of Ionospheric F2 Region over East Asia

Contact Info

Product

Resources

About