Broadband coherent polar region deep-layer ice penetrating radar system

Abstract

The invention discloses a broadband coherent polar region deep-layer ice penetrating radar system which comprises a digital system, a receiving system and a transmitting system. The digital system comprises a control unit, a frequency synthesis unit, a data collecting unit and a DDS, wherein the control unit is used for controlling al the units of the radar system, the frequency synthesis unit is used for generating clock signals needed by the operation of the control unit and the data collecting unit, the data collecting unit is used for collecting analog signals and storing and transmitting GPS signals, and the DDS is used for generating linear frequency modulation signals sources. The transmitting system comprises a power amplifier and a transmitting antenna, wherein the power amplifier is used for carrying out power amplification on the linear frequency modulation signal sources generated by the DDS, and the transmitting antenna is used for radiating electromagnetic wave signals output by the power amplifier out. The receiving system comprises a double-channel receiving unit used for carrying out high-gain channel and low-grain channel amplification on the received signals output by the front end units. A wave band between VHF and UHF is selected as system working frequency, a frequency modulation pulse compression system is adopted, and the requirements for penetrability and the resolution ratio can be met.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a broadband coherent polar deep ice detection radar system, in which, according to the principle that ice has little attenuation of electromagnetic waves, electromagnetic waves are used to detect subglacial layers, and are used to detect the thickness of polar ice sheets and subglacial layered structure. Background technique [0002] The first method of using radar to detect polar glaciers was British Waite in the 1950s, and radar systems for this purpose developed rapidly thereafter. Traditional radar systems have adopted the short pulse system. [0003] In 1984, my country sent a team for the first time to conduct scientific expeditions to Antarctica. In the early 1980s, the Institute of Environment and Engineering for Cold and Arid Regions of the Chinese Academy of Sciences developed the B-1 thickness-measuring radar, and successfully tested it on the No. 1 Tiansha...

AI Technical Summary

Problems solved by technology

[0005] The technical disadvantages of traditional ice-penetrating radar include: (1) The transmission pulse is the Impulse system, and the average energy is small; (2) The antenna and the ground must be well coupled to ensure that the maximum energy can be transmitted underground; (3) The Impulse system radar system Generally, the equivalent sampling technology is adopted, and the speed of the moving platform is not required to be too high, which also limits the application of the radar on the fast moving platform

[0006] The above-mentioned characteristics of traditional ice-penetrating radar limit its application in polar deep ice detection, and also limit its application in vehicle and airborne platforms

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