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A wireless transmission method of flight test telemetry data based on dynamic modulation mechanism

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: 2017-11-17
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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  • A wireless transmission method of flight test telemetry data based on dynamic modulation mechanism
  • A wireless transmission method of flight test telemetry data based on dynamic modulation mechanism

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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 the step 2, the airborne transceiver divides the telemetry data block to be sent into P lengths and is n (n is the information bit when LDPC code encoding number) data sequence {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 relates to a wireless transmission method of flight test telemetry data based on a dynamic modulation mechanism, and the invention relates to a wireless transmission method of flight test telemetry data. The invention aims to solve the problems of low efficiency and poor reliability of test data transmission for wireless communication link quality dynamics, and proposes a wireless transmission method for flight test telemetry data based on a dynamic modulation mechanism. The method is to obtain the mapping relationship M through 1. pass the test verification; 2. start timing the wireless communication time; 3. estimate the channel quality, and obtain the modulation scheme Di according to M; 4. encode the telemetry data to obtain the coding result Cj ; 5. Carry out Di modulation to the encoding result Cj, and send it; 6. The ground station transceiver performs Di demodulation and decoding to obtain the estimated value of the data sequence Sj; 7. Judging whether the telemetry data has been sent; 8. Judging whether it reaches The set time threshold t and other steps are realized. The invention is applied to the field of wireless transmission of flight test telemetry data.

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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Patent Type & Authority Patents(China)
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