CN104753637B - A kind of flight test telemetry radio transmitting method based on dynamic modulation mechanism - Google Patents

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 D _i according to M; 4. encode the telemetry data to obtain the encoding result C _j ; 5. Perform D _i modulation on the encoding result C _j and send it; 6. The ground station transceiver performs D _i demodulation and decoding to obtain the estimated value of the data sequence S _j ; 7. Determine whether the telemetry data has been sent ; 8. It is realized by steps such as judging whether the set time threshold t is reached. The invention is applied to the field of wireless transmission of flight test telemetry data.

Description

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

technical field

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

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 used, reliable data transmission can be achieved, but when the quality of the wireless communication link is good, the transmission efficiency of telemetry data is very low; and if a fixed modulation scheme with high transmission efficiency is selected solution, the corresponding anti-interference ability will be very weak, and the reliable transmission of telemetry data cannot be guaranteed when the quality of the wireless communication link is poor. To sum up, none of the above solutions can take into account the problems of transmission efficiency and transmission reliability.

Contents of the invention

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.

Above-mentioned purpose of the invention is achieved through the following technical solutions:

Step 1. Determine the mapping relationship M between the signal-to-noise ratio SNR _i and the modulation scheme D _i during reliable wireless transmission; expressed by M={(SNR _i , D _i )}; wherein, 1≤i≤I, i ∈N, I is the maximum value of i, and N is a set of integers; the signal-to-noise ratio SNR _i indicates that during the flight test of the aircraft, the airborne transceiver uses the internal channel estimator to estimate the distance between the current airborne transceiver and the ground station transceiver. The quality of the wireless communication link;

Step 2: The airborne transceiver divides the telemetry data block to be sent into P data sequences {S ₁ , S ₂ , S ₃ ,...,S _j ,...S _P } of length n; where, j represents the serial number of the telemetry data sequence, and 1≤j≤P, P is the total number of sequences, and the value is a positive integer greater than 1;

Step 3, the airborne transceiver sets its internal timer value to 0, and starts timing the time of wireless communication between the airborne transceiver and the ground station transceiver; the airborne transceiver uses the internal channel estimator to estimate the current wireless communication The signal-to-noise ratio SNR _i of the link;

Step 4, the airborne transceiver determines the corresponding modulation scheme D _i according to the link signal-to-noise ratio SNR _i and the mapping relationship M;

Step five, the airborne transceiver performs OQPSK modulation on the modulation scheme D _i to obtain the first modulated carrier signal, and convert the first modulated carrier signal into the first wireless signal through the internal radio frequency circuit, and send To the ground station transceiver; the ground station transceiver receives the first wireless signal from the airborne transceiver, and performs OQPSK demodulation to obtain this modulation scheme D _i ;

Step 6: The airborne transceiver obtains the generation matrix G of the LDPC code according to the data length n and the LDPC coding rate R, and performs LDPC coding on the telemetry data sequence S _j with a length of n according to the matrix G, and obtains a coding result sequence with a length of l C _j ; Wherein, the LDPC coding code rate R is the ratio of the data length n to the code length l after LDPC coding, that is, R=n/l;

Step 7, the airborne transceiver modulates the coding result sequence C _j according to the modulation scheme D _i to obtain the second modulated carrier signal, and converts the second modulated carrier signal through the wireless radio frequency circuit inside the airborne transceiver into a second wireless signal and send it to the ground station transceiver;

Step 8: After the radio frequency circuit of the ground station transceiver receives the second wireless signal from the airborne transceiver, the ground station transceiver demodulates the second wireless signal according to the demodulation scheme corresponding to D _i , and obtains the demodulation result

Step 9, the ground station transceiver obtains the corresponding parity check matrix H according to the generation matrix G, and demodulates the result according to the parity check matrix H Perform LDPC code decoding to obtain the estimated value of the telemetry data sequence S _j Represents the sequence The estimated value of the kth telemetry data in ;

Step ten, increase j by 1, and the airborne transceiver judges whether the telemetry data has been sent, that is, judges whether the value of j is equal to P+1; if so, ends this communication; otherwise, execute step eleven;

Step 11, judge whether the value of the timer inside the airborne transceiver reaches the preset time threshold t, if the timer reaches the preset time threshold t, execute step 3; otherwise, execute step 6; it is completed A method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism.

Invention effect

The present invention adopts the self-adaptive coding and modulation technology, that is, dynamically adjusts the modulation scheme according to the quality of the wireless communication link, and realizes high-efficiency and reliable transmission of telemetry data, that is, both reliability and efficiency of transmission are taken into account.

The invention proposes a wireless dynamic transmission mechanism of flight test data based on a dynamic modulation mechanism to solve the negative impact of the dynamic quality of wireless communication links on the efficiency and reliability of test data transmission. That is, the airborne transceiver obtains the estimated value of the current wireless communication link quality through the link quality estimator at regular intervals, so as to dynamically select the appropriate modulation scheme, modulate the telemetry data, and then pass the radio frequency form of the antenna sent to the ground station. And so on. This ensures reliable and broadband transmission of telemetry data.

According to the quality of the wireless communication link, the modulation and demodulation scheme is dynamically adjusted, and the effective data transmission rate is also dynamically adjusted. That is, when the link quality is high, a high-efficiency modulation scheme is adopted to increase the effective transmission rate of telemetry data and realize high-speed transmission of telemetry data. In this way, the maximum throughput of flight test data transmission is realized. Compared with the classic BPSK modulation, the throughput can be increased by up to 128 times;

The dynamic transmission mechanism adopted in the present invention adopts a low-efficiency modulation scheme when the link quality is low, and increases the anti-interference ability of the communication system to obtain reliable telemetry data transmission. The reliability of communication is guaranteed, that is, the reliability of flight test data transmission is guaranteed to the greatest extent.

Description of drawings

Fig. 1 is the working flow diagram of the airborne transceiver proposed in Embodiment 1;

Fig. 2 is a working flowchart of the ground station transceiver proposed in the first embodiment.

detailed description

Specific embodiment one: below in conjunction with Fig. 1 and Fig. 2 illustrate this embodiment, a kind of flight test telemetry data wireless transmission method based on dynamic modulation mechanism of this embodiment, specifically prepare according to the following steps:

Step 1. After repeated tests and experiments, determine the mapping relationship M between the signal-to-noise ratio SNR _i and the modulation scheme D _i during reliable wireless transmission; expressed by M={(SNR _i , D _i )}; where M represents The mapping relationship between the wireless communication link quality (signal-to-noise ratio SNR _i ) SNR _i and the modulation scheme D _i ; 1≤i≤I, i∈N, I is the maximum value of i, N is an integer set; reliable The wireless transmission is that the ground station transceiver is completely able to correctly receive the telemetry data from the airborne transceiver; the signal-to-noise ratio SNR _i indicates that during the flight test of the aircraft, in various wireless communication environments, the airborne transceiver utilizes the internal channel estimator Estimate the quality of the wireless communication link between the current airborne transceiver and the ground station transceiver;

Step 2: The airborne transceiver divides the telemetry data block to be sent into P data sequences {S ₁ , S ₂ , S ₃ ,..., S _j ,...S _P }; where j represents the serial number of the telemetry data sequence, and 1≤j≤P, P is the total number of sequences, and the value is a positive integer greater than 1;

Step 3, the airborne transceiver sets its internal timer value to 0, and starts timing the time of wireless communication between the airborne transceiver and the ground station transceiver; the airborne transceiver uses the internal channel estimator to estimate the current wireless communication The signal-to-noise ratio SNR _i of the link;

Step 4, the airborne transceiver determines the corresponding modulation scheme D _i according to the link signal-to-noise ratio SNR _i and the mapping relationship M;

Step five, the airborne transceiver performs OQPSK modulation on the modulation scheme D _i to obtain the first modulated carrier signal, and convert the first modulated carrier signal into the first wireless signal through the internal radio frequency circuit, and send To the ground station transceiver; the ground station transceiver receives the first wireless signal from the airborne transceiver, and performs OQPSK demodulation to obtain this modulation scheme D _i ;

Step 6, the airborne transceiver obtains the generation matrix G of the LDPC code according to the data length n (n is the number of information bits when the LDPC code is encoded) and the LDPC code rate R, and according to the matrix G, the telemetry data sequence S _j of length n Carry out LDPC encoding to obtain an encoding result sequence C _j of length l; wherein, the LDPC encoding code rate R is the data length (the number of information bits when encoding the LDPC code, agreed with the ground station transceiver in advance) n accounts for the LDPC encoding The ratio of the code length l, namely R=n/l;

Step 7, the airborne transceiver modulates the coding result sequence C _j according to the modulation scheme D _i to obtain the second modulated carrier signal, and converts the second modulated carrier signal through the wireless radio frequency circuit inside the airborne transceiver into a second wireless signal and send it to the ground station transceiver;

Step 8: After the radio frequency circuit of the ground station transceiver receives the second wireless signal from the airborne transceiver, the ground station transceiver demodulates the second wireless signal according to the demodulation scheme corresponding to D _i , and obtains the demodulation result

Step 9, the ground station transceiver obtains the corresponding parity check matrix H according to the generation matrix G, and demodulates the result according to the parity check matrix H Perform LDPC code decoding to obtain the estimated value of the telemetry data sequence S _j Represents the sequence The estimated value of the kth telemetry data in ;

Step ten, increase j by 1, and the airborne transceiver judges whether the telemetry data has been sent, that is, judges whether the value of j is equal to P+1; if so, ends this communication; otherwise, execute step eleven;

Step 11, judge whether the value of the timer inside the airborne transceiver reaches the preset time threshold t, if the timer reaches the preset time threshold t, execute step 3; otherwise, execute step 6; it is completed A method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism.

The effect of this implementation mode:

This implementation mode adopts adaptive coding and modulation technology, that is, dynamically adjusts the modulation scheme according to the quality of the wireless communication link, and realizes high-efficiency and reliable transmission of telemetry data, that is, both transmission reliability and transmission efficiency are taken into account.

This implementation mode proposes a wireless dynamic transmission mechanism of flight test data based on a dynamic modulation mechanism to solve the negative impact of the dynamic quality of wireless communication links on the efficiency and reliability of test data transmission. That is, the airborne transceiver obtains the estimated value of the current wireless communication link quality through the link quality estimator at regular intervals, so as to dynamically select the appropriate modulation scheme, modulate the telemetry data, and then pass the radio frequency form of the antenna sent to the ground station. And so on. This ensures reliable and broadband transmission of telemetry data.

According to the quality of the wireless communication link, the modulation and demodulation scheme is dynamically adjusted, and the effective data transmission rate is also dynamically adjusted. That is, when the link quality is high, a high-efficiency modulation scheme is adopted to increase the effective transmission rate of telemetry data and realize high-speed transmission of telemetry data. In this way, the maximum throughput of flight test data transmission is realized. Compared with the classic BPSK modulation, the throughput can be increased by up to 128 times;

The dynamic transmission mechanism adopted in this embodiment adopts a low-efficiency modulation scheme when the link quality is low, so as to increase the anti-interference capability of the communication system, so as to obtain reliable telemetry data transmission. The reliability of communication is guaranteed, that is, the reliability of flight test data transmission is guaranteed to the greatest extent.

Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the modulation scheme D _i is set to BPSK, QPSK, 16QAM, 32QAM, 64QAM, 128QAM and 256QAM. Other steps and parameters are the same as those in Embodiment 1.

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 Each sequence in the data sequence {S ₁ , S ₂ , S ₃ ,...,S _j ,...S _P } in, Indicates the kth telemetry data in the sequence S _j , where 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.

Specific embodiment four: the difference between this embodiment and one of the specific embodiments one to three is that the encoding result sequence of length 1 is obtained in step six in, Indicates the data in the encoding result sequence C _j , q indicates the data in the encoding result sequence C _j The serial number of , and 1≤q≤l. Other steps and parameters are the same as those in Embodiments 1 to 3.

Embodiment 5: This embodiment differs from Embodiment 1 to Embodiment 4 in that: G and H in step 9 satisfy H*G ^T =0. Other steps and parameters are the same as in one of the specific embodiments 1 to 4.

Embodiment 6: This embodiment differs from Embodiments 1 to 5 in that the range of the time threshold t in step 11 is limited to 4s˜15s. Other steps and parameters are the same as one of the specific embodiments 1 to 5.

Adopt the following examples to verify the beneficial effects of the present invention:

Embodiment one:

In this embodiment, a method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism is specifically prepared according to the following steps:

Step 1. After repeated tests and experiments, determine the mapping relationship M between the signal-to-noise ratio SNR _i and the modulation scheme D _i during reliable wireless transmission; expressed by M={(SNR _i , D _i )}; where M represents The mapping relationship between the wireless communication link quality (signal-to-noise ratio SNR _i ) SNR _i and the modulation scheme D _i ; 1≤i≤I, i∈N, I is the maximum value of i, N is an integer set; reliable The wireless transmission is that the ground station transceiver is completely able to correctly receive the telemetry data from the airborne transceiver; the signal-to-noise ratio SNR _i indicates that during the flight test of the aircraft, in various wireless communication environments, the airborne transceiver utilizes the internal channel estimator Estimate the quality of the wireless communication link between the current airborne transceiver and the ground station transceiver;

M mapping relationship:

SNR _i Modulation scheme D _i 1 BPSK 1.4 QPSK 1.8 16QAM 2.2 32QAM 2.6 64QAM 3.0 128QAM 3.4 256QAM

The data length n is 1024 bits, and I is 7.

Step 2: The airborne transceiver divides the telemetry data block to be sent into P data sequences {S ₁ , S ₂ , S ₃ ,..., Each sequence in S _j ,...S _P } Among them, j represents the serial number of the telemetry data sequence, and 1≤j≤P, P is the total number of sequences, and the value is a positive integer greater than 1; Indicates the kth telemetry data in the sequence S _j , where k represents the telemetry data The serial number of , and 1≤k≤n. P=9000, n=1024, S ₁ , S ₂ , S ₃ ,...,S _j ,...S _P are all 1*1024 data sequences;

Step 3, the airborne transceiver sets its internal timer value to 0, and starts timing the time of wireless communication between the airborne transceiver and the ground station transceiver; the airborne transceiver uses the internal channel estimator to estimate the current wireless communication SNR _i of the link; SNR _i = 1.8,

Step 4, the airborne transceiver determines the corresponding modulation scheme D _i according to the link signal-to-noise ratio SNR _i and the mapping relationship M;

SNR _i =1.8, then according to M, get D _i =16QAM;

Step five, the airborne transceiver performs OQPSK modulation on the modulation scheme D _i to obtain the first modulated carrier signal, and convert the first modulated carrier signal into the first wireless signal through the internal radio frequency circuit, and send To the ground station transceiver; the ground station transceiver receives the first wireless signal from the airborne transceiver, and performs OQPSK demodulation to obtain this modulation scheme D _i ;

Step 6, the airborne transceiver obtains the generation matrix G of the LDPC code according to the data length n (n is the number of information bits when the LDPC code is encoded) and the LDPC code rate R, and according to the matrix G, the telemetry data sequence S _j of length n Perform LDPC encoding to obtain an encoding result sequence of length l in, Indicates the data in the encoding result sequence C _j , q indicates the data in the encoding result sequence C _j serial number, and 1≤q≤l; the encoding code rate R of the Low-Density Parity Check Code (Low-Density Parity Check Code, LDPC) is set to 1/4, and the LDPC encoding code rate R is the data length (LDPC code encoding When the number of information bits, agreed in advance with the ground station transceiver) n accounts for the ratio of the code length l after LDPC encoding, that is, R=n/l;

n=1024, R _i =1/4, G is a matrix of 1024*4096, S _j is a data sequence of 1*1024, l=4096, C _j is a data sequence of 1*4096;

Step 7, the airborne transceiver modulates the coding result sequence C _j according to the modulation scheme D _i to obtain the second modulated carrier signal, and converts the second modulated carrier signal through the wireless radio frequency circuit inside the airborne transceiver into a second wireless signal and send it to the ground station transceiver;

D _i is 16QAM, C _j is a data sequence of 1*4096;

Step 8: After the radio frequency circuit of the ground station transceiver receives the second wireless signal from the airborne transceiver, the ground station transceiver demodulates the second wireless signal according to the demodulation scheme corresponding to D _i , and obtains the demodulation result

D _i is 64QAM, It is a data sequence of 1*4096;

G is a matrix of 1024*4096, H is a matrix of 1024*4096;

Step 9, the ground station transceiver obtains the corresponding parity check matrix H according to the generation matrix G, and demodulates the result according to the parity check matrix H Perform LDPC code decoding to obtain the estimated value of the telemetry data sequence S _j Represents the sequence The estimated value of the kth telemetry data in ; G and H satisfy H*G ^T =0.

It is a data sequence of 1*4096, It is a data sequence of 1*1024;

Step ten, j is incremented by 1, and the airborne transceiver judges whether the telemetry data has been sent, that is, judges whether the value of j is equal to P+1. If yes, end this communication; otherwise, go to step 11;

When j=1000, execute step eleven; when j=9001, end communication;

Step eleven, judging whether the value of the timer inside the airborne transceiver reaches the preset time threshold t, if the timer reaches the preset time threshold t, go to step three; otherwise, go to step six.

When t=4s, the value of the timer is equal to 2s, j is increased by 1, and step 6 is performed; when t=4s, the value of the timer is equal to 4s, then step 3 is performed.

The ground station transceiver adopts the same modulation mechanism and sending process as the airborne transceiver to realize the two-way dynamic wireless transmission mechanism.

The modulation schemes in the present invention include BPSK, QPSK, 16QAM, 32QAM, 64QAM, 128QAM and 256QAM. When the modulation scheme is BPSK, it is two-phase modulation, which corresponds to the largest constellation distance and the strongest anti-interference ability. It is suitable for low-quality wireless channels and can realize reliable transmission of flight test telemetry data. QPSK is a four-phase modulation, and there are 4 points on the corresponding constellation diagram. It is suitable for the situation where the quality of the wireless link is slightly better, and it can improve the transmission efficiency of the flight test telemetry data on the basis of BPSK. The transmission efficiency of BPSK, QPSK, 16QAM, 32QAM, 64QAM, 128QAM and 256QAM modulation schemes increases sequentially. The 256QAM modulation method corresponds to 256 points on the constellation diagram, and has the highest transmission efficiency. It is suitable for very good wireless channel quality to achieve fast bandwidth for wireless transmission of flight test telemetry data. In summary, according to the quality of the wireless link, the modulation scheme is dynamically adjusted to realize the reliability and broadband transmission of telemetry data in two-way wireless transmission.

Application: the present invention can be applied to the current one-way wireless transmission of flight test telemetry data based on the IRIG 106 standard, and the two-way wireless transmission of flight test telemetry data based on the iNET standard.

The present invention can also have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations are all Should belong to the scope of protection of the appended claims of the present invention.

Claims (6)

1. A method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism, characterized in that: a method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism is specifically carried out in the following steps: Step 1. Determine the mapping relationship M between the signal-to-noise ratio SNR _i and the modulation scheme D _i during reliable wireless transmission; expressed by M={(SNR _i , D _i )}; wherein, 1≤i≤I, i ∈N, I is the maximum value of i, and N is a set of integers. Reliable wireless transmission means that the ground station transceiver can correctly receive the telemetry data from the airborne transceiver; the signal-to-noise ratio SNR _i indicates that the airborne The transceiver uses an internal channel estimator to estimate the quality of the wireless communication link between the current airborne transceiver and the ground station transceiver; Step 2: The airborne transceiver divides the telemetry data block to be sent into P data sequences {S ₁ , S ₂ , S ₃ ,...,S _j ,...S _P } of length n; where, j represents the serial number of the telemetry data sequence, and 1≤j≤P, P is the total number of sequences, and the value is a positive integer greater than 1; Step 3, the airborne transceiver sets its internal timer value to 0, and starts timing the time of wireless communication between the airborne transceiver and the ground station transceiver; the airborne transceiver uses the internal channel estimator to estimate the current wireless communication The signal-to-noise ratio SNR _i of the link; Step 4, the airborne transceiver determines the corresponding modulation scheme D _i according to the link signal-to-noise ratio SNR _i and the mapping relationship M; Step five, the airborne transceiver performs OQPSK modulation on the modulation scheme D _i to obtain the first modulated carrier signal, and convert the first modulated carrier signal into the first wireless signal through the internal radio frequency circuit, and send To the ground station transceiver; the ground station transceiver receives the first wireless signal from the airborne transceiver, and performs OQPSK demodulation to obtain this modulation scheme D _i ; Step 6: The airborne transceiver obtains the generation matrix G of the LDPC code according to the data length n and the LDPC coding rate R, and performs LDPC coding on the telemetry data sequence S _j with a length of n according to the matrix G, and obtains a coding result sequence with a length of l C _j , q represents the data in the encoding result sequence C _j The serial number; Wherein, the LDPC coding rate R is the ratio of the data length n to the code length l after LDPC coding, that is, R=n/l; Step 7, the airborne transceiver modulates the coding result sequence C _j according to the modulation scheme D _i to obtain the second modulated carrier signal, and converts the second modulated carrier signal through the wireless radio frequency circuit inside the airborne transceiver into a second wireless signal and send it to the ground station transceiver; Step 8: After the radio frequency circuit of the ground station transceiver receives the second wireless signal from the airborne transceiver, the ground station transceiver demodulates the second wireless signal according to the demodulation scheme corresponding to D _i , and obtains the demodulation result Step 9, the ground station transceiver obtains the corresponding parity check matrix H according to the generation matrix G, and demodulates the result according to the parity check matrix H Perform LDPC code decoding to obtain the estimated value of the telemetry data sequence S _j Represents the sequence The estimated value of the kth telemetry data in ; Step ten, increase j by 1, and the airborne transceiver judges whether the telemetry data has been sent, that is, judges whether the value of j is equal to P+1; if so, ends this communication; otherwise, execute step eleven; Step 11, judge whether the value of the timer inside the airborne transceiver reaches the preset time threshold t, if the timer reaches the preset time threshold t, execute step 3; otherwise, execute step 6; it is completed A method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism. 2. A kind of flight test telemetry data wireless transmission method based on dynamic modulation mechanism according to claim 1, is characterized in that: in step 1, modulation scheme D _i is set to BPSK, QPSK, 16QAM, 32QAM, 64QAM, 128QAM and 256QAM . 3. a kind of flight test telemetry data wireless transmission method based on dynamic modulation mechanism according to claim 1, is characterized in that: in the step 2, the airborne transceiver divides the telemetry data block to be sent into P pieces of data whose length is n Each sequence in the sequence {S ₁ ,S ₂ ,S ₃ ,...,S _j ,...S _P } in, Indicates the kth telemetry data in the sequence S _j , where k represents the telemetry data The serial number of , and 1≤k≤n. 4. a kind of flight test telemetry data wireless transmission method based on dynamic modulation mechanism according to claim 1, is characterized in that: obtain length in the step 6 and be the encoding result sequence of 1 C _j =S _j *G, where, Indicates the data in the encoding result sequence C _j , q indicates the data in the encoding result sequence C _j The serial number of , and 1≤q≤l. 5. A method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism according to claim 1, characterized in that: G and H in step 9 satisfy H*G ^T =0. 6 . A method for wireless transmission of flight test telemetry data based on a dynamic modulation mechanism according to claim 1 , wherein the range of the time threshold t in step 11 is limited to 4s˜15s.