Method for measuring lunar soil dielectric coefficient by using single-transmitting and double-receiving lunar surface ground penetrating radar

Abstract

The invention discloses a method for measuring a lunar soil dielectric coefficient by using a single-transmitting and double-receiving lunar surface ground penetrating radar. A transmitting antenna of the lunar surface ground penetrating radar is Tx, and receiving antennas of the lunar surface ground penetrating radar are Rx1 and Rx2. The method includes the following steps: step1, acquiring propagation time t1 and t2 consumed by radar signals radiated by the transmitting antenna to reach the receiving antennas from radar echo data, step2, establishing a simultaneous equation to acquire the propagation speed v of radar waves in lunar soil according to the acquired propagation time t1 and t2 consumed by the radar signals to be echoed to the receiving antennas, and step3, acquiring the lunar soil dielectric coefficient epsilon (regolith) according to the acquired propagation speed v of the radar waves in the lunar soil. According to the method, a single-transmitting and double-receiving detection mode is introduced in the moon measuring radar, the method for measuring the lunar soil dielectric coefficient by using the lunar surface ground penetrating radar with the double receiving antennas is established, relations between distances of the receiving antennas and the transmitting antenna and a detection depth is provided, and bases are provided for designing single-transmitting and double-receiving planet surface ground penetrating radars in future.

Description

technical field [0001] The invention relates to the technical field of ground-penetrating radar, in particular to a method for measuring the dielectric constant of lunar soil by a single-engine and double-receive lunar surface ground-penetrating radar. Background technique [0002] Lunar radar is a time-domain ground-penetrating radar that works in the state of non-carrier frequency nanosecond pulses. It is the first time that humans have used surface ground-penetrating radar to detect the lunar subsurface. It is equipped with two detection channels, of which the second channel uses a single-engine and double-receive mode to detect the thickness of the lunar soil on the rover's walking route. [0003] In order to obtain the thickness of the lunar soil accurately, it is necessary to measure the dielectric constant of the lunar soil. According to the working experience of ground penetrating radar in ground detection, the most commonly used method is the borehole sampling meth...

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Problems solved by technology

In the current published literature, the measured dielectric constant of Apollo samples is a relatively authoritative result, but the lunar radar detection area is in Hongwan, and Apollo has not obtained lunar soil samples in the Hongwan area, although samples from the lunar sea area can also be used. measured values ​​to approximate, but the results are not accurate

The dielectric constant of the medium can also be calculated by detecting the time delay of the target echo. The commonly used methods include the known target depth method, the point source reflector method, the common center point method and the layered reflector method, but the above methods require known The depth of the target or the distance of the transmitting and receiving antenna changes, which is obviously not suitable for the lunar subsurface detection of the lunar radar

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