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Dynamic modulation mechanism based flight test telemeasuring data wireless transmission method

A technology of telemetry data and flight test, applied in the direction of digital transmission system, transmission system, baseband system components, etc., can solve the problems of low transmission efficiency and poor reliability of test data, achieve maximum, ensure reliability, and increase effective The effect of transfer rate

Active Publication Date: 2015-07-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low efficiency and poor reliability of test data transmission due to the dynamic quality of wireless communication links, and propose a method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism

Method used

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  • Dynamic modulation mechanism based flight test telemeasuring data wireless transmission method
  • Dynamic modulation mechanism based flight test telemeasuring data wireless transmission method

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination figure 1 and figure 2 Describe this embodiment, a method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism in this embodiment, specifically prepared according to the following steps:

[0024] Step 1. After repeated tests and experiments, determine the signal-to-noise ratio (SNR) during reliable wireless transmission i with modulation scheme D i The mapping relationship M between; use M={(SNR i ,D i )} represents; among them, M represents in wireless communication link quality (signal-to-noise ratio SNR i Indicates) SNR i with modulation scheme D i 1≤i≤I, i∈N, I is the maximum value of i, and N is an integer set; reliable wireless transmission means that the ground station transceiver can correctly receive the telemetry data from the airborne transceiver; Noise Ratio SNR i Indicates that during the flight test of the aircraft, in various wireless communicati...

specific Embodiment approach 2

[0040] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the modulation scheme D in step one i Set to BPSK, QPSK, 16QAM, 32QAM, 64QAM, 128QAM and 256QAM. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0041] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step 2, the airborne transceiver divides the telemetry data block to be sent into length n (n is the number of information bits when LDPC code is encoded) The P data sequences {S 1 ,S 2 ,S 3 ,...,S j ,...S P} in each sequence in, Represents the sequence S j In the kth telemetry data, k represents the telemetry data The serial number of , and 1≤k≤n. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a dynamic modulation mechanism based flight test telemeasuring data wireless transmission method and relates to a flight test telemeasuring data wireless transmission method. The dynamic modulation mechanism based flight test telemeasuring data wireless transmission method aims at solving the problems of low transmission efficiency and low reliability of wireless communication link quality dynamic test data. The dynamic modulation mechanism based flight test telemeasuring data wireless transmission method comprises the steps of 1 obtaining a mapping relation M through test validation; 2 counting wireless transmission time; 3 estimating channel quality and obtaining a modulation scheme Di according to the M; 4 encoding telemeasuring data to obtain an encoding result Cj; 5 conducing Di modulation on the encoding result Cj and sending the encoding result Cj; 6 conducting Di demodulation and decoding on a ground station transceiver to obtain a data sequence Sj estimated value; 7 judging whether telemeasuring data sending is completed or not; 8 judging whether a set time threshold value t is reached or not and the like. The dynamic modulation mechanism based flight test telemeasuring data wireless transmission method is applied to the field of flight test telemeasuring data wireless transmission.

Description

technical field [0001] The invention relates to a wireless transmission method of flight test telemetry data, in particular to a wireless transmission method of flight test telemetry data based on a dynamic modulation mechanism, which is applied to the field of wireless transmission of flight test telemetry data. Background technique [0002] Due to the requirements and characteristics of the flight test, it is necessary to collect the performance parameters of the flight test aircraft in all possible flight environments, and evaluate the flight performance. Therefore, during the flight test of the aircraft, the high-speed flight speed and the dynamically changing wireless communication distance make the quality of the wireless communication link between the airborne test network and the ground station change dynamically, which poses severe challenges to the wireless transmission of telemetry data. challenge. If a modulation scheme with strong anti-interference ability is u...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26H04L25/02
Inventor 罗清华王伟刘兆庆黄涛李晶
Owner HARBIN INST OF TECH
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