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Frequency tracking detection type radio altimeter simulator

A radio altimeter, frequency tracking technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve the problem of large signal attenuation, delay line altimeter simulator simulation accuracy greatly affected by temperature , clutter and other problems, to achieve the effect of improving the measurement accuracy

Active Publication Date: 2014-04-09
CHINA ELECTRONIS TECH INSTR CO LTD
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Problems solved by technology

[0006] 2. The signal attenuation of the existing delay line altimeter simulator is large and there are many clutters
[0008] 3. The simulation accuracy of the existing time-delay line altimeter simulator is greatly affected by temperature

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  • Frequency tracking detection type radio altimeter simulator
  • Frequency tracking detection type radio altimeter simulator
  • Frequency tracking detection type radio altimeter simulator

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] A frequency tracking and detecting type radio altimeter simulator according to the present invention simulates the stable frequency difference generated by the transmitting signal and receiving signal of the altimeter at a specific height and a specific scanning speed, so as to detect the altimeter For the accuracy of height measurement, when testing, the input terminal of the simulator is connected with the signal output terminal of the altimeter, and t...

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Abstract

The invention provides a frequency tracking detection type radio altimeter simulator which comprises a frequency detection unit, a height simulation unit, a frequency conversion unit, a fading simulation unit and an embedded computer. According to the frequency tracking detection type radio altimeter simulator provided by the invention, the height value simulation is accurate to meter; the range covers the whole measurement range of an altimeter; a frequency synthesis mode is used to carry out signal simulation; compared with the existing technology, the measurement accuracy is greatly improved, and the frequency tracking detection type radio altimeter simulator is convenient and quick; VCO whose low temperature drift frequency is 1GHz is used as the time reference of three local oscillators; and a measurement circuit has a small temperature drift coefficient.

Description

technical field [0001] The present invention relates to a radio altimeter simulation device, specifically a frequency tracking detection type radio altimeter simulator (also referred to as a simulator in the text), which is used to simulate a radio altimeter (also referred to as an altimeter in the text) to transmit signals through the ground Reflected to the signal received by the altimeter. Background technique [0002] At present, radio altimeters are measured by the transmission line delay method. The so-called transmission line delay method refers to that the frequency sweep signal output by the radio altimeter passes through a transmission line of limited length. Since the signal passes through the transmission line, there is a certain time delay from input to output, and because the altimeter output is a frequency sweep signal. During this period of time, there is a certain frequency difference between the signal frequencies at both ends of the transmission line. If...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/40G01S13/882G01S7/4065
Inventor 钱时祥张延涛高长全
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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