CN104601293A - Wireless flight test telemeasuring data transmitting method based on dynamic LDPC (low-density parity check) code rate - Google Patents

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

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CN104601293A
CN104601293A CN201510084903.7A CN201510084903A CN104601293A CN 104601293 A CN104601293 A CN 104601293A CN 201510084903 A CN201510084903 A CN 201510084903A CN 104601293 A CN104601293 A CN 104601293A
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transceiver
telemetry
sequence
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ldpc code
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CN104601293B (en
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罗清华
彭宇
王伟
黄涛
李瑞杰
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H04L1/0063—Single parity check
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

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

Based on the flight test telemetry radio transmitting method of dynamic LDPC code rate
Technical field
The present invention relates to flight test telemetry radio transmitting method.
Background technology
Due to requirement and the feature of flight test, gather take a flight test aircraft will performance parameter likely under flight environment of vehicle, and assess the performance of aircraft flight.Therefore in aircraft flight test process, the wireless communication distance phenomenon of flying speed at a high speed and dynamic change makes the wireless communication link quality between airborne transceiver and ground station's transceiver be dynamic change, proposes severe challenge to the reliability of telemetry wireless transmission and efficiency.Therefore, the present invention proposes based on dynamic code rate low-density checksum coding (Low-Density Parity Check Code, LDPC) dynamic transmission method that test flight data is wireless, changes to solve wireless communication link penetration quality dynamic the negative effect brought to test data efficiency of transmission and reliability.
Summary of the invention
The present invention is the wireless communication link quality that will solve between airborne transceiver and ground station's transceiver is dynamic change, cause the reliability of telemetry wireless transmission and efficiency cannot guaranteed problem, and provide the flight test telemetry radio transmitting method based on dynamic LDPC code rate.
Flight test telemetry radio transmitting method based on dynamic LDPC code rate realizes according to the following steps:
One, when aircraft flight test, by obtaining the testing authentication of radio communication between airborne transceiver and ground station's transceiver: at given signal to noise ratio snr iin situation, LDPC encoder bit rate R during reliable wireless communication i, can signal to noise ratio snr be obtained thus iwith LDPC encoder bit rate R imapping relations M, with M={ (SNR i, R i) represent, wherein i represents SNR iand R isequence number, and 1≤i≤I, i ∈ N, I is the maximum of i, and N represents integer set; Wherein, described LDPC encoder bit rate R ithe ratio that information digit n accounts for the rear code length l of coding, i.e. R i=n/l; Described reliable wireless communication refer to communication reception can correctly received communication transmit leg transmission data.That is: ground station correctly can receive the telemetry that airborne transceiver sends;
Two, airborne transceiver becomes length to be P the remote measurement sequence { S of n the telemetry block comminute that will send 1, S 2, S 3..., S j... S p, j represents the sequence number of telemetry sequence, and 1≤j≤P, P is total number of sequence, its value be greater than 1 positive integer; And for each sequence S j, have: represent sequence S ja middle kth telemetry, k represents telemetry sequence number, and 1≤k≤n;
Three, airborne transceiver arranges the timer value of its inside is 0, timing is started to the wireless communication time length between airborne transceiver and ground station's transceiver: airborne transceiver utilizes the channel estimator of its inside to estimate the quality of Current wireless communication link, uses signal to noise ratio snr irepresent the height of wireless communication link quality, 1≤i≤I, i ∈ N, N represents integer set;
Four, airborne transceiver is according to signal to noise ratio snr iwith mapping relations M, determine the encoder bit rate R of corresponding LDPC code i, airborne transceiver adopts SOQPSK modulation scheme to the encoder bit rate R of this LDPC code imodulate, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit of its inside by airborne transceiver, and sends to ground station's transceiver; Ground station's transceivers from the wireless signal of airborne transceiver, and carries out SOQPSK demodulation, obtains the encoder bit rate R of LDPC code iinformation;
Five, airborne transceiver is according to the encoder bit rate R of the LDPC code in step 4 iobtaining the generator matrix G of LDPC code, is the telemetry sequence of n to the length in step 2 S j = { u 1 j , u 2 j , u 3 j , . . . , u k j , . . . u n j } , 1 ≤ k ≤ n , 1 ≤ j ≤ N Carry out LDPC coding, as shown in formula (1), generate the coding result sequence that length is l q presentation code result sequence C jmiddle data sequence number, and 1≤q≤l, 1≤j≤N, presentation code result sequence C jmiddle data, then, in conjunction with SOQPSK scheme to coding result sequence C jmodulate, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit finally by airborne transceiver inside, sends to ground station's transceiver;
C j＝S j*G (1)
Six, ground station's transceiver, after receiving the wireless signal of step 5, carries out SOQPSK demodulation to it, obtains demodulation result and according to the generator matrix G of LDPC code, obtain corresponding check matrix H, according to check matrix H to demodulation result the code carrying out LDPC code is translated, thus obtains sending data sequence S jestimated value S ^ j = { u ^ 1 j , u ^ 2 j , u ^ 3 j , . . . , u ^ k j , . . . u ^ n j } ;
Seven, make j=j+1, airborne transceiver judges whether telemetry to be sent, and namely judges whether j value equals P+1: if so, then terminate this communication; Otherwise execution step 8;
Eight, airborne transceiver judges whether the value of its timer internal reaches the time t preset, and if so, performs step 3; Otherwise, perform step 5.
Invention effect:
LDPC code: low-density checksum coding (Low-Density Parity Check Code, LDPC)
Airborne transceiver is every at regular intervals, the estimated value of Current wireless communication link-quality is obtained by link quality valuator, with the scheme of the suitable coding of this Dynamic Selection, error correction coding is carried out to telemetry, and sends to ground station by the form of less radio-frequency.So constantly circulation is gone down.Thus ensure the reliable of telemetry and high-efficiency transfer.
(1) according to the height of communication link quality, dynamic conditioning encoder bit rate, also effective efficiency of transmission of data with regard to dynamic conditioning.Namely when link-quality height, increase encoder bit rate, also just increase effective efficiency of transmission of telemetry, realize the high-speed transfer of telemetry.Thus achieve the maximization of test flight data throughput of transmissions, relative to the LDPC code of classics, the highest throughput that improves reaches 4 times;
(2) invent the dynamic transmission mechanism adopted when link-quality is low, reduce encoder bit rate, increase the error correcting capability of communication system, to obtain reliable telemetry data transmission.Ensure that the reliability of communication, namely ensure that the reliability that test flight data transmits to the full extent.
The mechanism that the present invention proposes also can be applied in other chnnel coding, and such as convolution code, on Turbo code.
The present invention, when radio link quality is high, adopts high efficiency transmission means; And when radio link quality is low, adopt the transmission means of high reliability.Realize high reliability and the efficientibility of telemetry wireless transmission.
Application: the present invention can be applied in the occasion such as flight test telemetry double-direction radio transmission based on iNET standard.
Accompanying drawing explanation
Fig. 1 is workflow diagram of the present invention.
Embodiment
Embodiment one: the flight test telemetry radio transmitting method based on dynamic LDPC code rate of present embodiment realizes according to the following steps:
One, when aircraft flight test, by obtaining the testing authentication of radio communication between airborne transceiver and ground station's transceiver: at given signal to noise ratio snr iin situation, LDPC encoder bit rate R during reliable wireless communication i, can signal to noise ratio snr be obtained thus iwith LDPC encoder bit rate R imapping relations M, with M={ (SNR i, R i) represent, wherein i represents SNR iand R isequence number, and 1≤i≤I, i ∈ N, I is the maximum of i, and N represents integer set; Wherein, described LDPC encoder bit rate R ithe ratio that information digit n accounts for the rear code length l of coding, i.e. R i=n/l; Described reliable wireless communication refer to communication reception can correctly received communication transmit leg transmission data.That is: ground station's transceiver correctly can receive the telemetry that airborne transceiver sends;
Two, airborne transceiver becomes length to be P the remote measurement sequence { S of n the telemetry block comminute that will send 1, S 2, S 3..., S j... S p, j represents the sequence number of telemetry sequence, and 1≤j≤P, P is total number of sequence, its value be greater than 1 positive integer; And for each sequence S j, have: represent sequence S ja middle kth telemetry, k represents telemetry sequence number, and 1≤k≤n;
Three, airborne transceiver arranges the timer value of its inside is 0, timing is started to the wireless communication time length between airborne transceiver and ground station's transceiver: airborne transceiver utilizes the channel estimator of its inside to estimate the quality of Current wireless communication link, uses signal to noise ratio snr irepresent the height of wireless communication link quality, 1≤i≤I, i ∈ N, N represents integer set;
Four, airborne transceiver is according to signal to noise ratio snr iwith mapping relations M, determine the encoder bit rate R of corresponding LDPC code i, airborne transceiver adopts SOQPSK modulation scheme to the encoder bit rate R of this LDPC code imodulate, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit of its inside by airborne transceiver, and sends to ground station's transceiver; Ground station's transceivers from the wireless signal of airborne transceiver, and carries out SOQPSK demodulation, obtains the encoder bit rate R of LDPC code iinformation;
Five, airborne transceiver is according to the encoder bit rate R of the LDPC code in step 4 iobtaining the generator matrix G of LDPC code, is the telemetry sequence of n to the length in step 2 S j = { u 1 j , u 2 j , u 3 j , . . . , u k j , . . . u n j } , 1 ≤ k ≤ n , 1 ≤ j ≤ N Carry out LDPC coding, as shown in formula (1), generate the coding result sequence that length is l q presentation code result sequence C jmiddle data sequence number, and 1≤q≤l, 1≤j≤N, presentation code result sequence C jmiddle data, then, in conjunction with SOQPSK scheme to coding result sequence C jmodulate, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit finally by airborne transceiver inside, sends to ground station's transceiver;
C j＝S j*G (1)
Six, ground station's transceiver, after receiving the wireless signal of step 5, carries out SOQPSK demodulation to it, obtains demodulation result and according to the generator matrix G of LDPC code, obtain corresponding check matrix H, according to check matrix H to demodulation result the code carrying out LDPC code is translated, thus obtains sending data sequence S jestimated value S ^ j = { u ^ 1 j , u ^ 2 j , u ^ 3 j , . . . , u ^ k j , . . . u ^ n j } ;
Seven, make j=j+1, airborne transceiver judges whether telemetry to be sent, and namely judges whether j value equals P+1: if so, then terminate this communication; Otherwise execution step 8;
Eight, airborne transceiver judges whether the value of its timer internal reaches the time t preset, and if so, performs step 3; Otherwise, perform step 5.
Airborne transceiver described in step 4 passes through the wireless radio frequency circuit of its inside by the encoder bit rate R of this LDPC code isend to ground station's transceiver, need first to encoder bit rate R iinformation carries out SOQPSK modulation, then sends to ground station's transceiver by internal radio frequency circuit, and transmission times is three times, correctly receives code rate information to ensure that ground station's transceiver connects.Ground station's transceiver adopts SOQPSK demodulation mode, carries out demodulation to the wireless signal received, thus obtains encoder bit rate R i.
Embodiment two: present embodiment and embodiment one unlike: the data length n setting LDPC code in described step one is 4096bit, code check R ican 1/4,1/3,2/5,1/2,2/3,3/4,4/5 and 1 be set as;
When code check R is 1, corresponding Airborne Telemetry data transmission efficiency is maximum; When code check R is 1/4, information digit n accounts for 1/4 of code length l.Now, Airborne Telemetry data transmission efficiency is minimum, but error correcting capability is the strongest, ensures to transmit reliably;
According to the height of radio link quality, the code check that dynamic conditioning LDPC encodes, realizes the reliability of telemetry wireless transmission and broadband transmission.
Other step and parameter identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two unlike: in described step one, I value is 8.
Other step and parameter identical with embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three unlike: in described step 6, G and H meets H*G tthe relation of=0.
Other step and parameter identical with one of embodiment one to three.
Embodiment five: one of present embodiment and embodiment one to four unlike: in described step 8, t span is 2 ~ 10 seconds.
Other step and parameter identical with one of embodiment one to four.
Embodiment:
One, when aircraft flight test, by obtaining the testing authentication of radio communication between airborne transceiver and ground station's transceiver: at given signal to noise ratio snr ithe LDPC encoder bit rate R of the wireless transmission in situation i, can signal to noise ratio snr be obtained thus iwith LDPC encoder bit rate R imapping relations M, with M={ (SNR i, R i) represent, wherein i represents SNR iand R isequence number, and 1≤i≤I, i ∈ N, I is the maximum of i, and N represents integer set; Wherein, described LDPC encoder bit rate R ithe ratio that information digit n accounts for the rear code length l of coding, i.e. R i=n/l;
Wherein, described M mapping relations:
Signal to noise ratio snr i LDPC encoder bit rate R i
1 1/4
1.4 1/3
1.8 2/5
2.2 1/2
2.6 2/3
3.0 3/4
3.4 4/5
3.8 1
Data length n is 4096 bits, and I is 8.
Two, airborne transceiver becomes length to be the telemetry block comminute that will send, P=1000 the remote measurement sequence { S of n=4096 1, S 2, S 3..., S j... S p, S 1, S 2, S 3..., S j... S pbe the data sequence of 1*4096, j represents the sequence number of telemetry sequence, and 1≤j≤P, P is total number of sequence, its value be greater than 1 positive integer; And for each sequence S j, have: represent sequence S ja middle kth telemetry, k represents telemetry sequence number, and 1≤k≤n;
Three, airborne transceiver arranges the timer value of its inside is 0, timing is started to the wireless communication time length between airborne transceiver and ground station's transceiver: airborne transceiver utilizes the channel estimator of its inside to estimate the quality of Current wireless communication link, uses signal to noise ratio snr irepresent the height of wireless communication link quality, SNR i=2.2,1≤i≤I, i ∈ N;
Four, airborne transceiver is according to signal to noise ratio snr iwith mapping relations M, determine the encoder bit rate R of corresponding LDPC code i, airborne transceiver adopts SOQPSK modulation scheme to the encoder bit rate R of this LDPC code imodulate, obtain the carrier signal after modulating; Airborne transceiver is converted into wireless signal by the carrier signal after the wireless radio frequency circuit modulation of its inside, sends to ground station's transceiver; Ground station's transceivers from the wireless signal of airborne transceiver, and carries out SOQPSK demodulation, obtains the encoder bit rate R of LDPC code iinformation; SNR i=2.2, then, according to M, obtain R i=1/2;
Five, airborne transceiver is according to the coding code R of the LDPC code in step 4 i=1/2 ithe generator matrix G obtaining LDPC code is the matrix of 4096*8192, is the telemetry sequence of n=4096 to the length in step 2 S j = { u 1 j , u 2 j , u 3 j , . . . , u k j , . . . u n j } , 1 ≤ k ≤ n , 1 ≤ j ≤ N Carry out LDPC coding, as shown in formula (1), generate the coding result sequence that length is l=8192 c jfor the data sequence of 1*8192, q presentation code result sequence C jmiddle data sequence number, and 1≤q≤l, 1≤j≤N, presentation code result sequence C jmiddle data, then, modulate coding result sequence in conjunction with SOQPSK scheme, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit finally by airborne transceiver inside, sends to ground station's transceiver;
C j＝S j*G (1)
Six, ground station's transceiver, after receiving the wireless signal of step 5, carries out SOQPSK demodulation to it, obtains demodulation result and according to the generator matrix G of LDPC code, obtain corresponding check matrix H, according to check matrix H to demodulation result the code carrying out LDPC code is translated, thus obtains sending data sequence S jestimated value S ^ j = { u ^ 1 j , u ^ 2 j , u ^ 3 j , . . . , u ^ k j , . . . u ^ n j } ;
Wherein, described R i=1/2, for the data sequence of 1*8192
G is the matrix of 4096*8192, and H is the matrix of 4096*8192
for the data sequence of 1*8192, for the data sequence of 1*4096
Seven, make j=j+1, airborne transceiver judges whether telemetry to be sent, and namely judges whether j value equals P+1: if so, then terminate this communication; Otherwise execution step 8;
P+1=1001, as j=900, performs step 11; Work as j=1001, terminate communication;
Eight, airborne transceiver judges whether the value of its timer internal reaches the time t preset, and if so, performs step 3; Otherwise, perform step 5.
T span is 2 ~ 10 seconds, and as t=4s, when the value of timer equals 2s, j increases by 1, performs step 5; Work as t=4s, the value of timer equals 4s, then perform step 3.

Claims (5)

1., based on the flight test telemetry radio transmitting method of dynamic LDPC code rate, it is characterized in that the flight test telemetry radio transmitting method based on dynamic LDPC code rate realizes according to the following steps:
One, when aircraft flight test, by obtaining the testing authentication of radio communication between airborne transceiver and ground station's transceiver: at given signal to noise ratio snr iin situation, LDPC encoder bit rate R during reliable wireless communication i, can signal to noise ratio snr be obtained thus iwith LDPC encoder bit rate R imapping relations M, with M={ (SNR i, R i) represent, wherein i represents SNR iand R isequence number, and 1≤i≤I, i ∈ N, I is the maximum of i, and N represents integer set; Wherein, described LDPC encoder bit rate R ithe ratio that information digit n accounts for the rear code length l of coding, i.e. R i=n/l; Described reliable wireless communication refer to communication reception can correctly received communication transmit leg transmission data.That is: ground station correctly can receive the telemetry that airborne transceiver sends;
Two, airborne transceiver becomes length to be P the remote measurement sequence { S of n the telemetry block comminute that will send 1, S 2, S 3..., S j... S p, j represents the sequence number of telemetry sequence, and 1≤j≤P, P is total number of sequence, its value be greater than 1 positive integer; And for each sequence S j, have: represent sequence S ja middle kth telemetry, k represents telemetry sequence number, and 1≤k≤n;
Three, airborne transceiver arranges the timer value of its inside is 0, timing is started to the wireless communication time length between airborne transceiver and ground station's transceiver: airborne transceiver utilizes the channel estimator of its inside to estimate the quality of Current wireless communication link, uses signal to noise ratio snr irepresent the height of wireless communication link quality, 1≤i≤I, i ∈ N, N represents integer set;
Four, airborne transceiver is according to signal to noise ratio snr iwith mapping relations M, determine the encoder bit rate R of corresponding LDPC code i, airborne transceiver adopts SOQPSK modulation scheme to the encoder bit rate R of this LDPC code imodulate, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit of its inside by airborne transceiver, and sends to ground station's transceiver; Ground station's transceivers from the wireless signal of airborne transceiver, and carries out SOQPSK demodulation, obtains the encoder bit rate R of LDPC code iinformation;
Five, airborne transceiver is according to the encoder bit rate R of the LDPC code in step 4 iobtaining the generator matrix G of LDPC code, is the telemetry sequence of n to the length in step 2 1≤k≤n, 1≤j≤N carries out LDPC coding, as shown in formula (1), generates the coding result sequence that length is l q presentation code result sequence C jmiddle data sequence number, and 1≤q≤l, 1≤j≤N, presentation code result sequence C jmiddle data, then, in conjunction with SOQPSK scheme to coding result sequence C jmodulate, obtain the carrier signal after modulating; Carrier signal after modulation is converted into wireless signal by the wireless radio frequency circuit finally by airborne transceiver inside, sends to ground station's transceiver;
C j＝S j*G (1)
Six, ground station's transceiver, after receiving the wireless signal of step 5, carries out SOQPSK demodulation to it, obtains demodulation result and according to the generator matrix G of LDPC code, obtain corresponding check matrix H, according to check matrix H to demodulation result the code carrying out LDPC code is translated, thus obtains sending data sequence S jestimated value S ^ j = { u ^ 1 j , u ^ 2 j , u ^ 3 j , . . . , u ^ k j , . . . u ^ n j } ;
Seven, make j=j+1, airborne transceiver judges whether telemetry to be sent, and namely judges whether j value equals P+1: if so, then terminate this communication; Otherwise execution step 8;
Eight, airborne transceiver judges whether the value of its timer internal reaches the time t preset, and if so, performs step 3; Otherwise, perform step 5.
2. the flight test telemetry radio transmitting method based on dynamic LDPC code rate according to claim 1, the data length n that it is characterized in that setting in described step one LDPC code is 4096bit, code check R ican 1/4,1/3,2/5,1/2,2/3,3/4,4/5 and 1 be set as;
When code check R is 1, corresponding telemetry radio transmission efficiency is maximum; When code check R is 1/4, information digit n accounts for 1/4 of code length l.
3. the flight test telemetry radio transmitting method based on dynamic LDPC code rate according to claim 1, is characterized in that in described step one, I value is 8.
4. the flight test telemetry radio transmitting method based on dynamic LDPC code rate according to claim 3, is characterized in that in described step 6, G and H meets H*G tthe relation of=0.
5. the flight test telemetry radio transmitting method based on dynamic LDPC code rate according to claim 4, is characterized in that in described step 8, t span is 2 ~ 10 seconds.
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CN103179617A (en) * 2013-04-03 2013-06-26 北京航空航天大学 Method, equipment and system for scheduling and distributing wireless resources of aeronautical mobile communication system

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CN109003618A (en) * 2018-08-14 2018-12-14 Oppo广东移动通信有限公司 Coding control method, device, electronic equipment and storage medium
CN112448778A (en) * 2020-11-23 2021-03-05 中国人民解放军63921部队 Method and device for calculating demodulation time delay of ground remote measurement
CN112448778B (en) * 2020-11-23 2022-05-24 中国人民解放军63921部队 Method and device for calculating demodulation time delay of ground remote measurement

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