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Wireless flight test telemeasuring data transmitting method based on dynamic LDPC (low-density parity check) code rate

A technology of LDPC code and telemetry data, which is applied in the field of wireless transmission of telemetry data in flight tests, can solve the problems of unguaranteed reliability and efficiency of wireless transmission of telemetry data, and achieves increasing effective transmission efficiency, maximizing and reducing coding rate. Effect

Active Publication Date: 2015-05-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the quality of the wireless communication link between the airborne transceiver and the ground station transceiver is dynamically changed, resulting in that the reliability and efficiency of wireless transmission of telemetry data cannot be guaranteed, and provides a dynamic LDPC code based Method for wireless transmission of high-rate flight test telemetry data

Method used

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  • Wireless flight test telemeasuring data transmitting method based on dynamic LDPC (low-density parity check) code rate
  • Wireless flight test telemeasuring data transmitting method based on dynamic LDPC (low-density parity check) code rate
  • Wireless flight test telemeasuring data transmitting method based on dynamic LDPC (low-density parity check) code rate

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specific Embodiment approach 1

[0023] Specific embodiment one: the wireless transmission method of the flight test telemetry data based on the dynamic LDPC code rate of the present embodiment is realized according to the following steps:

[0024] 1. During the flight test of the aircraft, it is obtained through the test and verification of the wireless communication between the airborne transceiver and the ground station transceiver: at a given signal-to-noise ratio SNR i In the case of reliable wireless communication, the LDPC code rate R i , so the signal-to-noise ratio SNR can be obtained i with LDPC code rate R i The mapping relationship M, use M={(SNR i , R i )}, where i represents the SNR i and R i , and 1≤i≤I, i∈N, I is the maximum value of i, and N represents an integer set; wherein, the LDPC code rate R i is the ratio of the number of information bits n to the code length l after encoding, that is, R i =n / l; the reliable wireless communication means that the receiver of the communication can...

specific Embodiment approach 2

[0034] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the data length n of setting LDPC code is 4096bit in the described step one, code rate R i Can be set to 1 / 4, 1 / 3, 2 / 5, 1 / 2, 2 / 3, 3 / 4, 4 / 5 and 1;

[0035] When the code rate R is 1, the corresponding airborne telemetry data transmission efficiency is the highest; when the code rate R is 1 / 4, the number of information bits n occupies 1 / 4 of the code length l. At this time, the transmission efficiency of airborne telemetry data is the lowest, but the error correction capability is the strongest, ensuring reliable transmission;

[0036] According to the quality of the wireless link, the bit rate of LDPC coding is dynamically adjusted to realize the reliability and broadband transmission of telemetry data wireless transmission.

[0037] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0038] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the value of I in the step 1 is 8.

[0039] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a wireless flight test telemeasuring data transmitting method based on dynamic LDPC (low-density parity check) code rate, relates to a wireless flight test telemeasuring data transmitting method and solves the problem that telemeasuring data transmission efficiency and reliability cannot be guaranteed due to dynamic change of wireless transmission link quality. Through many tests, mapping relation between the wireless communication link quality and the LDPC code rate can be obtained during reliable and efficient transmission; during actual communication, an onboard transceiver partitions telemeasuring data blocks to be transmitted into data sequences; every other time, current wireless communication link quality can be estimated; with the mapping relation, the corresponding LDPC code rate can be obtained, the telemeasuring data sequences can be subjected to LDPC encoding and modulating and can be transmitted to a ground station transceiver through a wireless radio frequency circuit, and received signals are subjected to demodulation and LDPC decoding by the ground surface transceiver to obtain estimated telemeasuring data value. The wireless flight test telemeasuring data transmitting method is applied to the field of wireless transmission of telemeasuring data in flight test.

Description

technical field [0001] The invention relates to a wireless transmission method 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 of the aircraft. Therefore, during the flight test of the aircraft, the high-speed flight speed and the dynamically changing wireless communication distance phenomenon make the quality of the wireless communication link between the airborne transceiver and the ground station transceiver dynamically change, which provides a guarantee for the wireless transmission of telemetry data. Reliability and efficiency present serious challenges. Therefore, the present invention proposes a flight test data wireless dynamic transmission method based on a dynamic code rate Low-Density Parity Check Code (Low-Density Parity Check Code, L...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26H04L25/02
CPCH04L1/0002H04L1/0056H04L1/0063H04L25/0202H04L27/2602
Inventor 罗清华彭宇王伟黄涛李瑞杰
Owner HARBIN INST OF TECH