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Multi-channel height measurement radio altimeter

A radio altimeter, multi-channel technology, applied in radio wave measurement system, radio wave reflection/re-radiation, measuring device, etc.

Inactive Publication Date: 2017-08-18
BEIJING QINGYUN AVIATION INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, for example, after the ejection seat is ejected out of the bin, it is necessary to measure the height of reflecting surfaces in different directions at the same time, and the current radio altimeter cannot complete this task

Method used

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  • Multi-channel height measurement radio altimeter

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Experimental program
Comparison scheme
Effect test

Embodiment

[0016] A multi-channel altimeter radio altimeter is invented, which uses a frequency-modulated continuous wave altimetry system for height measurement, and by adding a program-controlled radio frequency switch circuit in the radio frequency transceiver unit of the altimeter, and using FPGA to switch and control the channel of the radio frequency switch. , switch the transmitted radio frequency signal to each radio frequency channel in time-division sequence for transmission and reception. The altimeter signal processing unit sequentially processes the echo signals of each radio frequency channel and calculates the height value.

[0017] In the altimetry process of the FM continuous wave system, FPGA is used as the core control chip, and it is used to realize the functions of FFT transformation and DDS signal generation. The signal calculation unit receives the 10KHz~7.5MHz difference frequency signal output by the radio frequency transceiver unit, and acquires the height infor...

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Abstract

The invention belongs to the technical field of radio height measurement, and relates to a multi-channel height measurement radio altimeter. The characteristics lie in that the multi-channel height measurement radio altimeter comprises an AGC amplifier (1), a first mixer (2), a first filter (3), a low-speed AD converter (4), an FFT converter (5), a CPU (6), a DDS signal generator (7), a DA converter (8), a second mixer (9), a second filter (10), a power amplifier (11), a second radio frequency switch (12), a first radio frequency switch (13), a local oscillator switch (14) and a frequency source (15). The multi-channel height measurement radio altimeter provided by the invention performs processing on transmitting and receiving of electromagnetic waves and echo signals for antenna channels in multiple directions, and meets a requirement that height measurement is performed on reflecting surfaces in different directions simultaneously after an ejection seat is ejected out of a cabin.

Description

technical field [0001] The invention belongs to the technical field of radio altimetry, and relates to a multi-channel altimeter radio altimeter. Background technique [0002] Radio altimeter is an airborne device that uses electromagnetic waves for distance detection. At present, radio altimeters mostly use frequency-modulated continuous waves or pulse compression altimetry systems. The altimeter radiates electromagnetic waves in the form of continuous waves or pulses to the ground at a certain angle through a directional antenna. The electromagnetic waves are transmitted through space and reflected on the ground and then received by the receiving antenna. The altimeter uses the time delay of electromagnetic wave transmission to calculate the height of the aircraft from the ground. At present, the radio frequency transceiver unit of the altimeter transceiver can only realize the transmission and reception of one radio frequency signal, because the height measurement of the ...

Claims

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Application Information

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IPC IPC(8): G01S13/34G01S7/35
CPCG01S13/34G01S7/35
Inventor 张健杨健王茹吕百成马将徐艳潘学明宁丽娟
Owner BEIJING QINGYUN AVIATION INSTR CO LTD
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