In the Dynasonde, the combined pulses are elaborately designed, the receiving antenna array are skillfully disposed, and the echoes' phases are accurately acquired. In order to improve the measurement precision of Doppler frequency shift and other echo parameters, Wright and Pitteway proposed a new dynamic ionosonde named Dynasonde. Consequently, the height profile of the ionospheric disturbance cannot be fully obtained. Although the drift mode for ionospheric observation used in ionospheric vertical sounding can get the Doppler frequency shift with higher precision, the number of the observed frequencies is few. However, owing to the limited duration time of the transmitted pulses, the precision of the Dopplionogram obtained by the above method is poor and cannot entirely meet the demand for observation and research of ionospheric disturbances.
As a result, the Doppler frequency shift of these high-frequency signals can be obtained. In addition, these instruments can also usually transmit several pulses and do FFT analysis of these pulses. Various digital ionosondes presently in use can obtain the curve of variation of the echo's virtual height with the scan frequency, scale various ionospheric characteristics parameters automatically or semiautomatically, and also invert the ionogram and obtain the electron density profile below the ionospheric F2 layer peak. Nowadays, a digital ionosonde is a universal instrument for observing the ionosphere from the ground.
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In the middle of the 1990s with the rapid development of Internet communication and hardware and software technology of personal computer, modern digital ionosondes with lower power consumption and networking function were developed and put into use. With over 70 years of development the ionosonde went through such several phases from manual operation to automatic operation, from analog form to digital form, from single virtual height measurement to multiple parameter measurements like amplitude, phase, polarization, Doppler frequency shift, arrival angle and so on simultaneously. Ionospheric vertical sounding method invented in the 1920s showed the existence of the ionosphere and ionosonde instruments designed to use this method have been widely used for ionospheric observation and research. The application of the new mode for observation of ionospheric disturbances in ionospheric vertical sounding opens up a new, effective way by which much more ionospheric information can be acquired with existing common ionospheric sounding instruments. Experimental results show that the newly developed mode for observation of ionospheric disturbances on CADI can acquire accurate Doppler ionogram (Dopplionogram) and obtain temporal and spatial variations of the velocity of ionospheric disturbances in real time so that it has essential value in observation and research of ionospheric disturbances. This paper presents and realizes a new mode for observation of ionospheric disturbances using a combination of coded pulses and echo phase measurement analysis in ionospheric vertical sounding based on the Canadian Advanced Digital Ionosonde (CADI) platform. 1) Warranty does Not Cover Damage Caused to the Product Due to Improper Installation by Customer Normal Wear and Tear Caused Due to Use of Product.Ģ) Warranty does Not Cover Any External Accessories to the Product (Such as Battery, Cable, Carrying Bag etc.)ģ) All Plastic, Rubber, Glass, or Aesthetic Parts and Consumable Replacements will be on a Chargeable Basis.Ĥ) All Transportation & Handling Expenses Incurred while Replacing or Repairing will be Payable by the Customer.Ī) The Product is Not Operated as per the Instructions Given in the User Guide, if Any.Detecting Doppler frequency shifts from ionospheric high-frequency echoes is an important way to study ionospheric disturbances.1) Warranty is Non-transferrable, Valid Only in the Territory of India and Extended Only to the First End User Customer (Customer).Ģ) Warranty will be Valid Only when the Original Purchase Invoice is Presented at the Time of Service.ģ) Warranty will Cover Only Functional Parts and Software Issues having Manufacturing Defects and does Not Cover Damages Resulting from Unauthorised Adaptations/Adjustments/Tampering of the Product, Improper Installation of the Product, Normal Wear and Tear Caused Due to Use of Product.Carry-in, For warranty claims or any product related issues please email at or call: +91-6366043210.
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