Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for improving audio signal precision of decimetric wave instrument landing system

An instrument landing system and audio signal technology, which is applied in the field of improving the accuracy of the audio signal of the decimeter wave instrument landing system, and can solve problems such as unstable duty cycle

Inactive Publication Date: 2013-05-01
TIANJIN 764 COMM AIRMANSHIP
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The frequency stability and duty cycle requirements of these three signals are relatively high. The frequency of the original navigation audio signal is in the range of 1300±2Hz and 2100±2Hz, and the duty cycle is also unstable.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving audio signal precision of decimetric wave instrument landing system
  • Method for improving audio signal precision of decimetric wave instrument landing system
  • Method for improving audio signal precision of decimetric wave instrument landing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] In order to understand the present invention more clearly, describe the present invention in detail in conjunction with accompanying drawing and embodiment:

[0029] Such as Figure 1 to Figure 3 As shown, the method for improving the audio signal accuracy of the decimeter wave instrument landing system is implemented by using the single-chip microcomputer AT89C2051. Through parameter calculation, the crystal oscillator frequency connected to the single-chip microcomputer AT89C2051 in the audio generator is determined, and the frequency stability and duty cycle of the control signal are obtained. The method Including the following steps:

[0030] Step 1: Generate 1300Hz, 2100Hz and 12.5Hz signals by single-chip microcomputer AT89C2051;

[0031] Step 2: Select the appropriate peripheral device of the single-chip microcomputer - the crystal oscillator. From a mathematical point of view, the frequency generated by the crystal oscillator is required to be a common mul...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for improving audio signal precision of a decimetric wave instrument landing system. Through parameter computation, frequency of a crystal oscillator connected with a singlechip AT89C2051 in an audio generator is determined, and frequency stability and duty ratio of signals are controlled. The method comprises the following steps: 1, signals of 1300Hz, 2100Hz and 12.5Hz are generated by the singlechip AT89C2051; 2, a proper singlechip crystal oscillator is selected; 3, the relation between a common multiple 13.104*10+6 and signals of 1300Hz, 2100Hz and 12.5H is computed; and 4, the crystal oscillator of 13.104Hz is selected to meet the requirements on the frequency stability and the duty ratio of the signals of 1300Hz, 2100Hz and 12.5Hz. The method disclosed by the invention has the beneficial effects that after the crystal oscillator of 13.104MHz is selected, the signal frequencies of the audio generator achieve 1300+ / -0.05Hz, 2100+ / -0.05Hz and 12.5+ / -0.01Hz, the duty ratio is within the range of 50+ / -0.5%, and compared with indexes obtained in the prior art, the indexes of the invention are greatly improved.

Description

technical field [0001] The invention relates to an audio generator for a decimeter wave instrument landing system, in particular to a method for improving the accuracy of the audio signal of the decimeter wave instrument landing system. Background technique [0002] The audio generator is an important part of the ranging response part of the decimeter wave instrument landing system of the navigation equipment, and it mainly generates three kinds of signals. One is to send the 1300Hz / 2100Hz navigation audio signal to the transmitter for modulation; the other is to generate a 12.5Hz signal, one way is sent to the antenna feed box as a commutation signal, and the other is sent to the main controller to generate a 27V 12.5Hz signal , for antenna feed inspection; the third is the calibration signal sent to the detection interface board. The frequency stability and duty cycle requirements of these three signals are relatively high. The frequency of the original navigation audio s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/02
Inventor 安红霞
Owner TIANJIN 764 COMM AIRMANSHIP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com