CN115426032B

CN115426032B - Signal capturing method and device

Info

Publication number: CN115426032B
Application number: CN202211365890.7A
Authority: CN
Inventors: 于海涛; 艾国; 杨作兴
Original assignee: Shenzhen MicroBT Electronics Technology Co Ltd
Current assignee: Shenzhen MicroBT Electronics Technology Co Ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2023-03-28
Anticipated expiration: 2042-11-03
Also published as: CN115426032A

Abstract

The present disclosure relates to a signal acquisition method and apparatus, the method comprising: receiving a radio frequency signal and preprocessing the radio frequency signal to obtain a Doppler frequency offset data set; obtaining a frequency domain result data set through the Doppler frequency offset data set; obtaining the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set through the frequency domain result data set; obtaining a phase difference between a second frequency-boosting symbol and a third frequency-boosting symbol according to the initial position of the first frequency-boosting symbol in the Doppler frequency offset data set, the spread spectrum gain and the standard symbol data; obtaining Doppler frequency offset according to the phase difference, the spread spectrum gain and the bandwidth of the frequency boosting symbol; and according to the phase difference, performing Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by the subsequent received radio frequency signals to complete the acquisition of the satellite signals. The method and the device realize the acquisition of the satellite signal only by using the frequency-increasing symbol in the satellite signal synchronization head, save the time occupied by the synchronization head to finish the symbol, and reduce the acquisition complexity of the satellite signal.

Description

Signal capturing method and device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a signal acquisition method and apparatus.

Background

At present, the development of the satellite internet of things is more and more rapid, and particularly, a communication network in the field of low-orbit satellites cannot keep the same real-time performance as a ground network when the number of the satellites is insufficient.

The chirp system is now widely used in satellite communication as an advanced spread spectrum system, but because the doppler in satellite communication is large and there is correlation between doppler and bit synchronization of the chirp system, which brings difficulty to acquisition, when designing a synchronization head of a satellite signal, an extra symbol is added to eliminate the correlation between doppler and bit synchronization, thus increasing the length of the synchronization head, reducing the efficiency of data transmission, and making the complexity of acquisition higher.

Disclosure of Invention

In view of this, the present disclosure provides a signal capturing method and apparatus, which achieve more efficient capturing of satellite signals, reduce the occupied time of synchronization header signals, and reduce the capturing complexity.

The technical scheme of the disclosure is realized as follows:

a method of signal acquisition, comprising:

receiving a radio frequency signal, wherein the radio frequency signal comprises a satellite signal, and the satellite signal comprises a synchronization header signal, wherein the synchronization header signal comprises a first frequency-boosting symbol, a second frequency-boosting symbol and a third frequency-boosting symbol which are continuous, the bandwidths of all the frequency-boosting symbols are equal, and the spread spectrum gains of all the frequency-boosting symbols are equal;

preprocessing the radio frequency signal to obtain a Doppler frequency offset data set, wherein the Doppler frequency offset data set comprises frequency offset data of the first frequency-boosting symbol, the second frequency-boosting symbol and the third frequency-boosting symbol;

obtaining a frequency domain result data set according to the Doppler frequency offset data set, the spread spectrum gain of the frequency-increasing symbol and standard symbol data, wherein each frequency domain result data in the frequency domain result data set comprises an amplitude value phase value;

obtaining an initial position of the first frequency-increasing symbol in the doppler frequency offset data set through the amplitude value in the frequency domain result data set;

obtaining a phase difference between the second and third upconverted symbols according to the initial position of the first upconverted symbol in the doppler frequency offset data set, the spread spectrum gain and the standard symbol data;

obtaining Doppler frequency offset according to the phase difference between the second frequency-raising symbol and the third frequency-raising symbol, the spread spectrum gain and the bandwidth;

and performing Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by subsequently received radio frequency signals according to the phase difference between the second frequency-boosting symbol and the third frequency-boosting symbol, so as to complete the acquisition of the satellite signals.

Further, the obtaining a frequency domain result data set according to the doppler frequency offset data set, the spread spectrum gain of the upconverting symbol and the standard symbol data includes:

in the DopuObtaining data [1] from the frequency deviation data set]To data [2 ] ^N ]Wherein, data [1]]Frequency offset data for the start of the Doppler frequency offset data set, 2 ^N For the spread spectrum gain, data [2 ] ^N ]For data [1] from the Doppler frequency offset data set]Starting No. 2 ^N Frequency offset data, wherein N is a positive integer not less than 8;

will data [1]]To data [2 ] ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N First intermediate result symbol data;

to the 2 ^N First intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain the frequency domain result data set, wherein the frequency domain result data set comprises A [1]]To A < 2 > ^N ]Wherein, A < 1 >]To correspond to data [1]]Frequency domain result data of A [2 ] ^N ]To correspond to data [2 ] ^N ]The frequency domain result data of (1).

Further, 2 is described ^N The standard symbol data is:

F(t)=cos(π*(t-2 ^N-1 ) ² /2 ^N )+sin(π*(t-2 ^N-1 ) ² /2 ^N )*i

wherein, F (t) is the t standard symbol data, t is more than or equal to 0 and less than or equal to 2 ^N-1 And i is an imaginary symbol.

Further, the obtaining the initial position of the first upconverting symbol in the doppler frequency offset data set by using the amplitude value in the frequency domain result data set includes:

obtaining frequency domain result data with the maximum amplitude value from the frequency domain result data of the number of the spread spectrum gains from the initial frequency domain result data of the frequency domain result data set;

and under the condition that the frequency domain result data with the maximum amplitude value meets the capture condition, determining the position of the frequency offset data corresponding to the frequency domain result data with the maximum amplitude value in the Doppler frequency offset data set as the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set.

Further, the obtaining, from the frequency domain result data of the number of spreading gains starting from the starting frequency domain result data of the frequency domain result data set, the frequency domain result data with the largest amplitude value includes:

obtaining A [1] in the frequency domain result dataset]To A < 2 > ^N ]Wherein, A < 1 >]Is the starting frequency domain result data of the frequency domain result data set, A [2 ] ^N ]Is A [1] from the frequency domain result data set]Starting No. 2 ^N Frequency domain result data;

to A < 1 >]To A < 2 > ^N ]All of 2 ^N Comparing the amplitude values of the frequency domain result data to obtain frequency domain result data A [ K ] with the maximum amplitude value]K is the serial number of the frequency domain result data with the largest amplitude value in the frequency domain result data set, and K is more than or equal to 1 and less than or equal to 2 ^N 。

Further, the capturing conditions are:

wherein, the first and the second end of the pipe are connected with each other,

is the amplitude value of the frequency domain result data with the largest amplitude value,

is the amplitude value of the kth frequency domain result data, k is more than or equal to 1 and less than or equal to 2 ^N K is an integer, and N is a positive integer not less than 8;

determining the position of the frequency offset data corresponding to the frequency domain result data with the maximum amplitude value in the doppler frequency offset data set as the initial position of the first frequency-increasing symbol in the doppler frequency offset data set, including:

and determining the position of the data [ K ] in the Doppler frequency offset data set as the initial position of the first frequency boost symbol in the Doppler frequency offset data set, wherein the data [ K ] is frequency offset data corresponding to the frequency domain result data A [ K ] with the maximum amplitude value, and K is the serial number of the frequency domain result data A [ K ] with the maximum amplitude value in the frequency domain result data set.

Further, the obtaining a phase difference between the second upconverted symbol and the third upconverted symbol according to the initial position of the first upconverted symbol in the doppler frequency offset data set, the spreading gain, and the standard symbol data includes:

obtaining, in the doppler frequency offset data set, frequency offset data of the second boosted symbol and frequency offset data of the third boosted symbol after the first initial position according to the initial position of the first boosted symbol in the doppler frequency offset data set and the spreading gain;

obtaining a frequency domain result data set of the second upconverted symbol and a frequency domain result data set of the third upconverted symbol according to the frequency offset data of the second upconverted symbol, the frequency offset data of the third upconverted symbol, the spreading gain and the standard symbol data, wherein each of the frequency domain result data set of the second upconverted symbol and the frequency domain result data set of the third upconverted symbol comprises a magnitude phase value;

obtaining first frequency domain result data of the second upconverted symbol and first frequency domain result data of the third upconverted symbol from the frequency domain result data set of the second upconverted symbol and the frequency domain result data set of the third upconverted symbol, respectively;

and obtaining a phase difference between the second frequency-up symbol and the third frequency-up symbol according to the first frequency domain result data of the second frequency-up symbol and the first frequency domain result data of the third frequency-up symbol.

Further, the obtaining, according to the initial position of the first upconverting symbol in the doppler frequency offset data set and the spreading gain, frequency offset data of the second upconverting symbol and frequency offset data of the third upconverting symbol after the first initial position includes:

obtaining the frequency offset starting position data of the second frequency-increasing symbol, the frequency offset starting position data of the third frequency-increasing symbol, the frequency offset ending position data of the second frequency-increasing symbol and the frequency offset ending position data of the third frequency-increasing symbol according to the following formulas:

data ₂ [1]=data[1+2 ^N -K]

data ₃ [1]=data[1+2*2 ^N -K]

data ₂ [2 ^N ]=data[2*2 ^N -K]

data ₃ [2 ^N ]=data[3*2 ^N -K]

wherein K is the serial number of the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set, and K is more than or equal to 1 and less than or equal to 2 ^N ，data ₂ [1]Data of the frequency offset start position of the second up-conversion symbol in the Doppler frequency offset data set ₃ [1]Data of the frequency offset starting position of the third up-conversion symbol in the Doppler frequency offset data set ₂ [2 ^N ]Data of the frequency offset end position of the second up-conversion symbol in the Doppler frequency offset data set ₃ [2 ^N ]Frequency offset ending position data of the third frequency-increasing symbol in the Doppler frequency offset data set;

will data [1+2 ^N -K]To data [2*2 ^N -K]Determining data [1+2 ] 2 as the frequency offset data of the second up-conversion symbol in the Doppler frequency offset data set ^N -K]To data [3*2 ^N -K]Determining frequency offset data in the Doppler frequency offset data set for the third up-converted symbol.

Further, the obtaining a frequency domain result data set of the second upconverted symbol and a frequency domain result data set of the third upconverted symbol according to the frequency offset data of the second upconverted symbol, the frequency offset data of the third upconverted symbol, the spreading gain, and the standard symbol data includes:

will data ₂ [1]To data ₂ [2 ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N A second intermediate result symbol data, wherein data ₂ [1]To data ₂ [2 ^N ]Frequency offset data for said second up-converted symbols, 2 ^N For the spread spectrum gain, N is a positive integer not less than 8;

to the 2 ^N Second intermediate result symbol data carries out 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of the second up-conversion symbol, wherein the frequency domain result data set of the second up-conversion symbol comprises B [1]]To B2 ^N ]Wherein, B < 1 >]To correspond to data ₂ [1]Frequency domain result data of (2) ^N ]To correspond to data ₂ [2 ^N ]The frequency domain result data of (a);

will data ₃ [1]To data ₃ [2 ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N A third intermediate result symbol data, wherein data ₃ [1]To data ₃ [2 ^N ]Frequency offset data for the third up-converted symbol;

to the 2 ^N Third intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of the third up-conversion symbol, wherein the frequency domain result data set of the third up-conversion symbol comprises C [1]]To C2 ^N ]Wherein, C1]To correspond to data ₃ [1]Frequency domain result data of C2 ^N ]To correspond to data ₃ [2 ^N ]The frequency domain result data of (2).

Further, the obtaining the first frequency domain result data of the second upconverted symbol and the first frequency domain result data of the third upconverted symbol from the frequency domain result data set of the second upconverted symbol and the frequency domain result data set of the third upconverted symbol, respectively, includes:

from B [1]]To B2 ^N ]To obtain B1]Wherein, B < 1 >]To B2 ^N ]For the frequency domain result data set of the second up-converted symbol, B [1]]First frequency domain result data for the second upconverted symbol;

from C1]To C2 ^N ]To obtain C1]Wherein, C1]To C2 ^N ]For the frequency domain result data set of the third up-converted symbol, C [1]]First frequency domain result data for the third up-converted symbol.

Further, the obtaining a phase difference between the second upconverted symbol and the third upconverted symbol according to the first frequency domain result data of the second upconverted symbol and the first frequency domain result data of the third upconverted symbol includes:

and subtracting the phase value of B [1] from the phase value of C [1] to obtain the phase difference between the second upconverting symbol and the third upconverting symbol, wherein B [1] is the first frequency domain result data of the second upconverting symbol, and C [1] is the first frequency domain result data of the third upconverting symbol.

Further, the obtaining a doppler frequency offset according to the phase difference between the second upconverted symbol and the third upconverted symbol, the spreading gain, and the bandwidth includes:

obtaining the Doppler frequency offset by the following formula

Θ/2π*BW/2 ^N

Wherein Θ is a phase difference between the second upconverted symbol and the third upconverted symbol, 2 ^N BW is the bandwidth for the spreading gain.

Further, the performing doppler compensation on frequency offset data in a doppler frequency offset data set obtained by a subsequently received radio frequency signal according to the phase difference between the second frequency-up symbol and the third frequency-up symbol includes:

doppler compensation of frequency offset data in a Doppler frequency offset data set obtained from subsequently received radio frequency signals by

data[k]*e ^iΘk

Wherein, data [ k ] is the kth frequency offset data in the doppler frequency offset data set obtained by the subsequent received radio frequency signal, k is the serial number of the frequency offset data in the doppler frequency offset data set obtained by the subsequent received radio frequency signal, Θ is the phase difference between the second and third upconverting symbols, and i is an imaginary number symbol.

Further, the preprocessing the radio frequency signal to obtain a doppler frequency offset data set includes:

carrying out down-conversion on the radio frequency signal to obtain an intermediate frequency signal;

performing analog-to-digital sampling on the intermediate frequency signal to obtain a sampling signal;

carrying out digital filtering on the sampling signal to obtain a filtering signal, wherein the filtering bandwidth is 1.3 times of the bandwidth of the frequency increasing symbol;

carrying out digital down-conversion on the filtering signal to obtain a mixed signal containing a zero intermediate frequency signal and a mirror image signal;

filtering the mixed signal to obtain the zero intermediate frequency signal;

and performing down-sampling on the zero intermediate frequency signal to obtain the Doppler frequency offset data set.

Further, the synchronization header signal includes six consecutive up-converted symbols at most, and the synchronization header signal does not include a synchronization header end symbol.

A signal acquisition device, comprising:

the signal receiving module is configured to receive a radio frequency signal, the radio frequency signal includes a satellite signal, the satellite signal includes a synchronization header signal, the synchronization header signal includes a first frequency-boosted symbol, a second frequency-boosted symbol and a third frequency-boosted symbol which are consecutive, the bandwidths of all the frequency-boosted symbols are equal, and the spreading gains of all the frequency-boosted symbols are equal;

a frequency offset data obtaining module configured to perform preprocessing on the radio frequency signal to obtain a doppler frequency offset data set, where the doppler frequency offset data set includes frequency offset data of each of the first boosted symbol, the second boosted symbol, and the third boosted symbol;

a frequency domain result obtaining module configured to perform obtaining a frequency domain result data set according to the doppler frequency offset data set, the spread spectrum gain of the upconverting symbol, and standard symbol data, wherein each frequency domain result data in the frequency domain result data set includes a magnitude value and a phase value;

a starting position obtaining module configured to perform a process of obtaining a starting position of the first ascending frequency symbol in the doppler frequency offset data set by the amplitude value in the frequency domain result data set;

a phase difference obtaining module configured to perform obtaining a phase difference of the second and third boosted symbols according to a starting position of the first boosted symbol in the doppler frequency offset data set, the spreading gain, and the standard symbol data;

a Doppler frequency offset obtaining module configured to obtain a Doppler frequency offset according to the phase difference of the second and third boosted frequency symbols, the spread spectrum gain and the bandwidth;

and the Doppler compensation module is configured to perform Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by a subsequently received radio frequency signal according to the phase difference between the second frequency-boosting symbol and the third frequency-boosting symbol, so as to complete acquisition of the satellite signal.

An electronic device, comprising:

a processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to execute the executable instructions to implement the signal acquisition method of any one of the above.

A computer readable storage medium having at least one instruction which, when executed by a processor of an electronic device, enables the electronic device to implement a signal acquisition method as in any one of the above.

It can be seen from the above solutions that, the signal capturing method and apparatus according to the embodiments of the present disclosure achieve the purpose of capturing a satellite signal only by using an up-conversion symbol in a synchronization header signal of the satellite signal, and therefore, a synchronization header end symbol does not need to be added to the synchronization header signal.

Drawings

FIG. 1 is a flow chart illustrating a method of signal acquisition in accordance with an exemplary embodiment;

FIG. 2 is a flow chart illustrating obtaining a Doppler shift data set in accordance with an exemplary embodiment;

FIG. 3 is a flow chart illustrating obtaining a frequency domain result data set in accordance with an illustrative embodiment;

FIG. 4 is a flow chart illustrating obtaining a starting position of a first up-converted symbol in a Doppler frequency offset data set in accordance with an exemplary embodiment;

FIG. 5 is a flow chart illustrating obtaining frequency domain result data with a maximum amplitude value in accordance with an illustrative embodiment;

FIG. 6 is a flow chart illustrating deriving a phase difference for a second upconverted symbol and a third upconverted symbol in accordance with an exemplary embodiment;

FIG. 7 is a flowchart illustrating an application scenario of a signal acquisition method according to an exemplary embodiment;

FIG. 8A is a graph illustrating the magnitude of an up-converted symbol as a function of time in accordance with one illustrative embodiment;

FIG. 8B is a graph illustrating the frequency of an up-converted symbol as a function of time in accordance with one illustrative embodiment;

FIG. 9 is a schematic diagram of down conversion shown in accordance with one illustrative embodiment;

FIG. 10 is a diagram illustrating a satellite signal packet format in accordance with one illustrative embodiment;

FIG. 11 is a diagram of a conventional satellite signal packet format;

FIG. 12 is a logical block diagram illustrating a signal capture device in accordance with an exemplary embodiment;

fig. 13 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure is further described in detail below with reference to the accompanying drawings and examples.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in other sequences than those illustrated or described herein. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

Fig. 1 is a flow chart illustrating a signal acquisition method according to an exemplary embodiment, and as shown in fig. 1, the signal acquisition method mainly includes the following steps 101 to 107.

Step 101, receiving a radio frequency signal, wherein the radio frequency signal includes a satellite signal, and the satellite signal includes a synchronization header signal, wherein the synchronization header signal includes a first frequency-up symbol, a second frequency-up symbol, and a third frequency-up symbol, bandwidths of all the frequency-up symbols are equal, and spreading gains of all the frequency-up symbols are equal.

In some embodiments, to ensure fast acquisition of the satellite signal and avoid a missed acquisition situation, the sync header signal includes six consecutive up-converted symbols, wherein the first up-converted symbol, the second up-converted symbol, and the third up-converted symbol are included in the six consecutive up-converted symbols. In this way, in the case that the first up-conversion symbol of the six up-conversion symbols is missed for capture, the following up-conversion symbols can be complemented, and the situation that the whole data frame is lost due to missing the up-conversion symbols can be prevented.

In some embodiments, to save time of the sync header signal, the sync header signal includes six consecutive up-converted symbols at most, and the sync header signal does not include a sync header end symbol.

In some embodiments, the satellite signal also includes a data field signal following the sync head signal.

Step 102, preprocessing the radio frequency signal to obtain a doppler frequency offset data set, where the doppler frequency offset data set includes respective frequency offset data of a first frequency-up symbol, a second frequency-up symbol, and a third frequency-up symbol.

Fig. 2 is a flowchart illustrating a method for obtaining a doppler shift data set according to an exemplary embodiment, where as shown in fig. 2, the preprocessing of the radio frequency signal in step 102 to obtain a doppler shift data set mainly includes the following steps 201 to 206.

Step 201, performing down-conversion on the radio frequency signal to obtain an intermediate frequency signal.

For example, the frequency of the rf signal is 400MHz (megahertz), and the intermediate frequency signal obtained after down-conversion is 10MHz. The down-conversion process can be implemented by using the prior art, and is not described herein again.

Step 202, analog-to-digital sampling is performed on the intermediate frequency signal to obtain a sampling signal.

For example, the analog-to-digital sampling uses high-speed analog-to-digital sampling, an analog-to-digital sampling clock is input from an external device, and a sampled signal is an intermediate-frequency analog signal of 10MHz. The process of analog-to-digital sampling can be implemented by using the prior art, and is not described in detail here.

And 203, performing digital filtering on the sampling signal to obtain a filtering signal, wherein the filtering bandwidth is 1.3 times of the bandwidth of the frequency boosting symbol.

The filtering bandwidth is 1.3 times of the bandwidth of the frequency-up symbol, so that the method can be suitable for the deviation of the central frequency point of the satellite signal caused by Doppler frequency offset. The data before digital filtering contains noise with a wide frequency range, and the filtered signal obtained after digital filtering only contains the noise in the satellite signal frequency band, so that the signal-to-noise ratio is improved. In an actual application scenario, the filtering bandwidth may also be slightly smaller than the bandwidth of the upconverting symbol by 1.3 times, so that the performance is slightly improved, but if the filtering bandwidth is set too low, more resources are consumed. The process of digital filtering can be implemented by using the prior art, and is not described in detail here.

And step 204, performing digital down-conversion on the filtered signal to obtain a mixed signal containing a zero intermediate frequency signal and an image signal.

After digital down-conversion, a zero intermediate frequency signal and a higher frequency image signal are generated. In some embodiments, the digital down-conversion of step 204 is performed by multiplying the intermediate frequency signal (the filtered signal obtained in step 203) by a 10M intermediate frequency signal, and obtaining a zero intermediate frequency signal and a higher frequency image signal after the multiplication. The process of digital down-conversion can be implemented by using the prior art, and is not described in detail here.

And step 205, filtering the mixed signal to obtain a zero intermediate frequency signal.

In some embodiments, the mixed signal is filtered by a digital low-pass filter to filter out an image signal therein, so as to obtain a zero intermediate frequency signal. The filtering process can be implemented by using the prior art, and is not described herein again.

And step 206, performing down-sampling on the zero intermediate frequency signal to obtain a Doppler frequency offset data set.

In some embodiments, the sampling rate of the down-sampling is the bandwidth of the up-converted symbols. The unit of the sampling rate of the down-sampling is the same as the unit of the bandwidth of the up-conversion symbol. The down-sampling process can be implemented by using the prior art, and is not described herein again.

And 103, obtaining a frequency domain result data set according to the Doppler frequency offset data set, the spread spectrum gain of the frequency-up symbol and the standard symbol data, wherein each frequency domain result data in the frequency domain result data set comprises an amplitude value and a phase value.

Fig. 3 is a flowchart illustrating obtaining a frequency domain result data set according to an exemplary embodiment, where the step 103 of obtaining the frequency domain result data set according to the doppler shift data set, the spread gain of the upscaled symbol and the standard symbol data shown in fig. 3 includes the following steps 301 to 303.

Step 301, obtaining data [1] in Doppler frequency offset data set]To data [2 ] ^N ]Wherein, data [1]]Initial frequency offset data for a Doppler frequency offset data set, 2 ^N For spread spectrum gain, data [2 ] ^N ]For data [1] from Doppler frequency offset data set]Starting No. 2 ^N And frequency offset data, wherein N is a positive integer not less than 8.

Wherein, data [1]]To data [2 ] ^N ]According to the spread spectrum gain 2 ^N Instead, that is, data [1]]To data [2 ] ^N ]The number of frequency offset data and the up-converted symbolIn such a way that data [1] is included in the radio signal in the case of a synchronous header signal of a satellite signal]To data [2 ] ^N ]Including at least a portion of the frequency offset data of the first up-converted symbol. It should be noted that, in the embodiment of the present disclosure, the first upconverted symbol, the second upconverted symbol, and the third upconverted symbol refer to three consecutive upconverted symbols in the plurality of upconverted symbols, the first upconverted symbol is a first upconverted symbol in the three consecutive upconverted symbols, the second upconverted symbol is a second upconverted symbol in the three consecutive upconverted symbols, and the third upconverted symbol is a third upconverted symbol in the three consecutive upconverted symbols. The plurality of up-converted symbols are referred to as sync header signals.

Step 302, convert data [1]]To data [2 ] ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N First intermediate result symbol data.

In some embodiments, 2 ^N The standard symbol data is:

F(t)=cos(π*(t-2 ^N-1 ) ² /2 ^N )+sin(π*(t-2 ^N-1 )2/2 ^N )*i

Based on this, 2 ^N The standard symbol data includes:

F(0)= cos(π*(-2 ^N-1 ) ² /2 ^N )+sin(π*(-2 ^N-1 )2/2 ^N )*i

F(1)=cos(π*(1-2 ^N-1 ) ² /2 ^N )+sin(π*(1-2 ^N-1 )2/2 ^N )*i

F(2)=cos(π*(2-2 ^N-1 ) ² /2 ^N )+sin(π*(2-2 ^N-1 )2/2 ^N )*i

……

F(2 ^N-1 )=cos(π*(2 ^N-1 -2 ^N-1 ) ² /2N)+sin(π*(2 ^N-1 -2 ^N-1 )2/2 ^N )*i

specifically, in step 302, data [1] is decoded]Multiply by F (0), data [2 ]]Multiplication with F (1),… …, and data [2 ] ^N ]And F (2) ^N-1 ) Multiply to obtain 2 ^N First intermediate result symbol data.

That is, the first intermediate result symbol data includes: data [1]]*F(0)、data[2]*F(1)、……、data[2 ^N ]*F(2 ^N-1 )。

Step 303, pair 2 ^N First intermediate result symbol data go 2 ^N Fast Fourier Transform (FFT) of the points to obtain a frequency domain result data set, wherein the frequency domain result data set comprises A [1]]To A < 2 > ^N ]Wherein, A < 1 >]To correspond to data [1]]Frequency domain result data of A [2 ] ^N ]To correspond to data [2 ] ^N ]The frequency domain result data of (2).

Specifically, the first intermediate result symbol data includes: data [1]]*F(0)、data[2]*F(1)、……、data[2 ^N ]*F(2 ^N-1 ) In step 303, the first intermediate result symbol data is processed by 2 ^N Fast fourier transforming the points to obtain a frequency domain result data set, comprising:

for data [1]]* F (0) is subjected to fast Fourier transform to obtain a data [1]]Frequency domain result data A [1]]To data [2 ]]* F (1) performs fast Fourier transform to obtain data [2 ]]Frequency domain result data A [2 ]]… …, for data [2 ] ^N ]*F(2 ^N-1 ) Performing fast Fourier transform to obtain data [2 ] ^N ]Frequency domain result data A [2 ] ^N ]。

And 104, obtaining the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set through the amplitude value in the frequency domain result data set.

Fig. 4 is a flowchart illustrating obtaining a start position of a first up-conversion symbol in a doppler shift data set according to an exemplary embodiment, where the step 104 of obtaining the start position of the first up-conversion symbol in the doppler shift data set through amplitude values in a frequency domain result data set as shown in fig. 4 includes the following steps 401 to 402.

Step 401, obtaining the frequency domain result data with the largest amplitude value from the frequency domain result data with the same number of spreading gains from the initial frequency domain result data of the frequency domain result data set.

Fig. 5 is a flowchart illustrating obtaining frequency domain result data with the largest amplitude value according to an exemplary embodiment, where as shown in fig. 5, the obtaining of the frequency domain result data with the largest amplitude value from the frequency domain result data of the number of spreading gains from the starting frequency domain result data of the frequency domain result data set in step 401 specifically includes the following steps 501 to 502.

Step 501, obtaining A [1] in the frequency domain result data set]To A < 2 > ^N ]Wherein, A < 1 >]Is the starting frequency domain result data of the frequency domain result data set, A [2 ] ^N ]Is A [1] from the frequency domain result data set]Starting No. 2 ^N Frequency domain result data.

Step 502, for A [1]]To A < 2 > ^N ]All of 2 ^N Comparing the amplitude values of the frequency domain result data to obtain frequency domain result data A [ K ] with the maximum amplitude value]K is the serial number of the frequency domain result data with the largest amplitude value in the frequency domain result data set, and K is more than or equal to 1 and less than or equal to 2 ^N 。

Wherein the frequency domain result data is expressed in the form of m × e ^iθ Where m is an amplitude value, θ is a phase value, and i is an imaginary symbol. For A [1]]To A < 2 > ^N ]All of 2 ^N All frequency domain result data can adopt m × e ^iθ Is expressed in the form of (1). In some embodiments, A [1] can be generated by a traversal method]To A2 ^N ]Finds the largest of the amplitude values (m), denoted as A [ K ] in the disclosed embodiment]。

Step 402, under the condition that the frequency domain result data with the maximum amplitude value meets the capture condition, determining the position of the frequency offset data corresponding to the frequency domain result data with the maximum amplitude value in the doppler frequency offset data set as the initial position of the first frequency-increasing symbol in the doppler frequency offset data set.

In some embodiments, the capture conditions are:

is the amplitude value of the kth frequency domain result data, k is more than or equal to 1 and less than or equal to 2 ^N And k is an integer and N is a positive integer not less than 8.

In step 402, when the amplitude value of ak satisfies the formula of the above-mentioned capturing condition, the position of the frequency offset data corresponding to ak in the doppler frequency offset data set is determined as the start bit of the first up-conversion symbol in the doppler frequency offset data set.

In step 402, determining the position of the frequency offset data corresponding to the frequency domain result data with the largest amplitude value in the doppler frequency offset data set as the initial position of the first frequency-increasing symbol in the doppler frequency offset data set, specifically including:

and determining the position of the data [ K ] in the Doppler frequency offset data set as the initial position of the first frequency boost symbol in the Doppler frequency offset data set, wherein the data [ K ] is the frequency offset data corresponding to the frequency domain result data A [ K ] with the maximum amplitude value, and K is the serial number of the frequency domain result data A [ K ] with the maximum amplitude value in the frequency domain result data set.

And 105, obtaining a phase difference between the second frequency-rising symbol and the third frequency-rising symbol according to the initial position of the first frequency-rising symbol in the Doppler frequency offset data set, the spread spectrum gain and the standard symbol data.

Fig. 6 is a flowchart illustrating a method for obtaining a phase difference between a second upconverted symbol and a third upconverted symbol according to an exemplary embodiment, where the step 105 of obtaining the phase difference between the second upconverted symbol and the third upconverted symbol according to a starting position of the first upconverted symbol in the doppler shift data set, a spreading gain and standard symbol data, as shown in fig. 6, includes the following steps 601 to 604.

Step 601, in the doppler frequency offset data set, obtaining frequency offset data of a second up-conversion symbol and frequency offset data of a third up-conversion symbol after the first start position according to the start position and the spread spectrum gain of the first up-conversion symbol in the doppler frequency offset data set.

In some embodiments, step 601 further includes the following steps 6011-6012.

Step 6011, obtain frequency offset start position data of the second upconverting symbol, frequency offset start position data of the third upconverting symbol, frequency offset end position data of the second upconverting symbol, and frequency offset end position data of the third upconverting symbol by the following formulas:

data ₂ [1]=data[1+2 ^N -K]

data ₃ [1]=data[1+2*2 ^N -K]

data ₂ [2 ^N ]=data[2*2 ^N -K]

data ₃ [2 ^N ]=data[3*2 ^N -K]

wherein K is the serial number of the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set, and K is more than or equal to 1 and less than or equal to 2 ^N ，data ₂ [1]For the frequency deviation starting position data, of the second up-conversion symbol in the Doppler frequency deviation data set ₃ [1]Data of the frequency offset start position of the third up-conversion symbol in the Doppler frequency offset data set ₂ [2 ^N ]Data of the frequency deviation ending position of the second up-conversion symbol in the Doppler frequency deviation data set ₃ [2 ^N ]And the frequency deviation ending position data of the third frequency-raising symbol in the Doppler frequency deviation data set.

Step 6012, mixing the data [1+2 ^N -K]To data [2*2 ^N -K]Determining the frequency offset data of the second up-conversion symbol in the Doppler frequency offset data set, and converting data [1+2 + ^N -K]To data [3*2 ^N -K]Frequency offset data in the doppler frequency offset data set is determined for the third up-converted symbol.

Step 602, obtaining a frequency domain result data set of the second upconverting symbol and a frequency domain result data set of the third upconverting symbol according to the frequency offset data of the second upconverting symbol, the frequency offset data of the third upconverting symbol, the spread spectrum gain and the standard symbol data, where each of the frequency domain result data sets of the second upconverting symbol and the third upconverting symbol includes an amplitude value and a phase value.

In some embodiments, step 602 further includes the following steps 6021 through 6024.

Step 6021, data ₂ [1]To data ₂ [2 ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N A second intermediate result symbol data, wherein data ₂ [1]To data ₂ [2 ^N ]Frequency offset data for second up-converted symbols, 2 ^N For spreading gain, N is a positive integer not less than 8.

Step 6022, pair 2 ^N Second intermediate result symbol data carries out 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of a second up-converted symbol, wherein the frequency domain result data set of the second up-converted symbol comprises B [1]]To B2 ^N ]Wherein, B < 1 >]To correspond to data ₂ [1]Frequency domain result data of (2) ^N ]To correspond to data ₂ [2 ^N ]The frequency domain result data of (2).

Step 6023, data ₃ [1]To data ₃ [2 ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N A third intermediate result symbol data, wherein data ₃ [1]To data ₃ [2 ^N ]Frequency offset data for a third up-converted symbol.

Step 6024, pair 2 ^N Third intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of a third up-conversion symbol, wherein the frequency domain result data set of the third up-conversion symbol comprises C1]To C2 ^N ]Wherein, C1]To correspond to data ₃ [1]Frequency domain result data of C2 ^N ]To correspond to data ₃ [2 ^N ]The frequency domain result data of (1).

Step 603, obtaining first frequency domain result data of the second upconverting symbol and first frequency domain result data of the third upconverting symbol from the frequency domain result data set of the second upconverting symbol and the frequency domain result data set of the third upconverting symbol, respectively.

In some embodiments, step 603 further includes the following steps 6031-6032.

Step 6031, from B [1]]To B2 ^N ]To obtain B1]Wherein, B < 1 >]To B2 ^N ]Is the frequency domain result data set of the second up-converted symbol, B [1]]Is the first frequency domain result data of the second up-converted symbol.

Step 6032, from C1]To C2 ^N ]To obtain C1]Wherein, C1]To C2 ^N ]Is the frequency domain result data set of the third up-converted symbol, C1]The first frequency domain result data for the third up-converted symbol.

And step 604, obtaining a phase difference between the second frequency-up symbol and the third frequency-up symbol according to the first frequency domain result data of the second frequency-up symbol and the first frequency domain result data of the third frequency-up symbol.

In some embodiments, step 604 specifically includes:

and subtracting the phase value of B1 from the phase value of C1 to obtain the phase difference between the second and third up-converted symbols, wherein B1 is the first frequency domain result data of the second up-converted symbol, and C1 is the first frequency domain result data of the third up-converted symbol.

And 106, obtaining the Doppler frequency offset according to the phase difference, the spread spectrum gain and the bandwidth of the second frequency-raising symbol and the third frequency-raising symbol.

In some embodiments, step 106 specifically includes:

obtaining the Doppler frequency offset by

Θ/2π*BW/2 ^N

Wherein Θ is the phase difference between the second and third upconverted symbols, 2 ^N BW is the bandwidth of the up-converted symbols for spreading gain.

And step 107, performing Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by the subsequently received radio frequency signal according to the phase difference between the second frequency-up symbol and the third frequency-up symbol, and completing the acquisition of the satellite signal.

In some embodiments, step 107 specifically includes:

performing Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by subsequently receiving radio frequency signals according to the following formula:

data[k]*e ^iΘk

wherein, data [ k ] is the kth frequency offset data in the Doppler frequency offset data set obtained by the subsequent received radio frequency signal, k is the serial number of the frequency offset data in the Doppler frequency offset data set obtained by the subsequent received radio frequency signal, Θ is the phase difference between the second ascending frequency symbol and the third ascending frequency symbol, and i is an imaginary number symbol.

The signal capturing method of the embodiment of the disclosure realizes the capturing of the satellite signal only by the frequency-increasing symbol in the synchronization header signal of the satellite signal, and therefore, the synchronization header ending symbol does not need to be added in the synchronization header signal.

Fig. 7 is a flowchart illustrating an application scenario of a signal capturing method according to an exemplary embodiment, where the application scenario of the signal capturing method mainly includes the following steps 701 to 722, as shown in fig. 7.

Step 701, receiving a radio frequency signal.

The radio frequency signal includes a satellite signal, and the satellite signal includes a sync header signal.

Wherein the synchronization header signal includes only six consecutive up-converted symbols, and the synchronization header signal does not include a synchronization header end symbol. And the six continuous frequency-increasing symbols comprise a first frequency-increasing symbol, a second frequency-increasing symbol and a third frequency-increasing symbol, and the first frequency-increasing symbol, the second frequency-increasing symbol and the third frequency-increasing symbol are continuous.

Wherein, the bandwidth of all the ascending frequency symbols is BW, and the spread spectrum gain of all the ascending frequency symbols is 2 ^N And N is a positive integer not less than 8.

The synchronous head signal comprises six continuous frequency-increasing symbols, so that the satellite signal can be rapidly captured, and the condition of missing capture is avoided.

Fig. 8A is a graph illustrating the amplitude of an upconverted symbol as a function of time in accordance with an exemplary embodiment, and fig. 8B is a graph illustrating the frequency of an upconverted symbol as a function of time in accordance with an exemplary embodiment, where an upconverted symbol refers to a symbol in which the frequency is increased from a lower frequency to a higher frequency as a function of time, and in some embodiments, the frequency is monotonically increasing linearly as shown in fig. 8B.

Step 702, down-converting the radio frequency signal to obtain an intermediate frequency signal.

Fig. 9 is a schematic diagram of down-conversion according to an exemplary embodiment, as shown in fig. 9, in a case that a radio frequency signal includes a sync header signal, the sync header signal and an FC (filter) carrier are subjected to a mixer to obtain an intermediate frequency signal after down-conversion, where the mixer may be implemented by using the prior art, and details thereof are not repeated here.

And 703, performing analog-to-digital sampling on the intermediate frequency signal to obtain a sampling signal.

And 704, performing digital filtering on the sampling signal to obtain a filtering signal.

Wherein the filter bandwidth is BW 130%. The method can ensure that the method can adapt to the deviation of the central frequency point of the satellite signal caused by Doppler frequency offset. The data before digital filtering contains noise with a wide frequency range, and the filtered signal obtained after digital filtering only contains the noise in the satellite signal frequency band, so that the signal-to-noise ratio is improved. The process of digital filtering can be implemented by using the prior art, and is not described in detail here.

Step 705, performing digital down-conversion on the filtered signal to obtain a mixed signal including a zero intermediate frequency signal and an image signal.

For example, the filtered signal is a 10M if signal, and after digital down-conversion, a zero if signal and a higher frequency image signal are generated. Digital down-conversion is the multiplication of the intermediate frequency signal with the 10M intermediate frequency signal. The process of digital down-conversion can be implemented by using the prior art, and is not described in detail here.

And step 706, filtering the mixed signal to obtain a zero intermediate frequency signal.

The mixed signal can be filtered by a digital low-pass filter to filter the image signal therein, so as to obtain a zero intermediate frequency signal. The filtering process can be implemented by using the prior art, and is not described herein again.

And 707, down-sampling the zero intermediate frequency signal to obtain a doppler frequency offset data set.

In some embodiments, the sampling rate for the downsampling is BW. The down-sampling process can be implemented by using the prior art, and is not described herein again.

Step 708, obtaining data [1] in the Doppler frequency offset data set]To data [2 ] ^N ]Wherein, data [1]]Data [2 ] being the initial frequency offset data of the Doppler frequency offset data set ^N ]For data [1] from Doppler frequency offset data set]Starting No. 2 ^N And frequency offset data.

Step 709, convert data [1]]To data [2 ] ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N First intermediate result symbol data.

Wherein 2 ^N The standard symbol data is:

F(t)=cos(π*(t-2 ^N-1 ) ² /2 ^N )+sin(π*(t-2 ^N-1 )2/2 ^N )*i

Based on this, 2 ^N A standardThe symbol data includes:

F(0)=cos(π*(-2 ^N-1 ) ² /2 ^N )+sin(π*(-2 ^N-1 )2/2 ^N )*i

F(1)=cos(π*(1-2 ^N-1 ) ² /2 ^N )+sin(π*(1-2 ^N-1 )2/2 ^N )*i

F(2)=cos(π*(2-2 ^N-1 ) ² /2 ^N )+sin(π*(2-2 ^N-1 )2/2 ^N )*i

……

F(2 ^N-1 )=cos(π*(2 ^N-1 -2 ^N-1 ) ² /2N)+sin(π*(2 ^N-1 -2 ^N-1 )2/2 ^N )*i

specifically, in step 709, data [1] is decoded]Multiply by F (0), data [2 ]]Multiply by F (1), … …, convert data [2 ] ^N ]And F (2) ^N-1 ) Multiply to obtain 2 ^N First intermediate result symbol data.

Step 710, for 2 ^N First intermediate result symbol data go 2 ^N And carrying out fast Fourier transform on the points to obtain a frequency domain result data set.

Wherein the frequency domain result data set comprises A [1]]To A < 2 > ^N ]Wherein, A < 1 >]To correspond to data [1]]Frequency domain result data of (A2) ^N ]To correspond to data [2 ] ^N ]The frequency domain result data of (2).

Step 711, obtain A [1] in the frequency domain result data set]To A < 2 > ^N ]。

Wherein, A < 1 >]Is the starting frequency domain result data of the frequency domain result data set, A [2 ] ^N ]Is A [1] from the frequency domain result data set]Starting No. 2 ^N Frequency domain result data.

In connection with the description of step 710, A [1]]Is both corresponding to data [1]]Is the starting frequency domain result data of the frequency domain result data set, A [2 ] ^N ]I.e. corresponding to data [2 ] ^N ]Is again A [1] from the frequency domain result data set]Starting No. 2 ^N Frequency domain result data.

Step 712, for A [1]]To A < 2 > ^N ]All of 2 ^N Comparing the amplitude values of the frequency domain result data to obtain frequency domain result data A [ K ] with the maximum amplitude value]。

Wherein K is the serial number of the frequency domain result data with the maximum amplitude value in the frequency domain result data set, and K is more than or equal to 1 and less than or equal to 2 ^N 。

Wherein the frequency domain result data is expressed in the form of m × e ^iθ Where m is the amplitude value, θ is the phase value, and i is the imaginary symbol. For A [1]]To A < 2 > ^N ]All of 2 ^N All frequency domain result data can adopt m × e ^iθ Is expressed in the form of (1). In some embodiments, A [1] can be generated by a traversal method]To A < 2 > ^N ]Finds the largest of the amplitude values (m), denoted as A [ K ] in the disclosed embodiment]。

Step 713, judging whether A [ K ] meets the capture condition, if yes, executing step 714, otherwise, returning to step 701.

And 714, determining the position of the data [ K ] corresponding to the A [ K ] in the Doppler frequency offset data set as the initial position of the first frequency boosting symbol in the Doppler frequency offset data set.

In some embodiments, the capture conditions are:

wherein the content of the first and second substances,

And the data [ K ] is frequency offset data corresponding to the frequency domain result data A [ K ] with the maximum amplitude value, wherein K is a serial number of the frequency domain result data with the maximum amplitude value in the frequency domain result data set.

Step 715, in the Doppler frequency offset data set, according to the data [ K ]]Spread spectrum gain to obtain data K]Data of a second subsequent up-converted symbol ₂ [1]To data ₂ [2 ^N ]And data of a third up-converted symbol ₃ [1]To data ₃ [2 ^N ]。

Specifically, frequency offset starting position data of the second frequency-increasing symbol, frequency offset starting position data of the third frequency-increasing symbol, frequency offset ending position data of the second frequency-increasing symbol, and frequency offset ending position data of the third frequency-increasing symbol are obtained by the following formulas:

data ₂ [1]=data[1+2 ^N -K]

data ₃ [1]=data[1+2*2 ^N -K]

data ₂ [2 ^N ]=data[2*2 ^N -K]

data ₃ [2 ^N ]=data[3*2 ^N -K]

wherein, K is the serial number of the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set, and K is more than or equal to 1 and less than or equal to 2 ^N ，data ₂ [1]For the frequency deviation starting position data, of the second up-conversion symbol in the Doppler frequency deviation data set ₃ [1]Data of the frequency offset start position of the third up-conversion symbol in the Doppler frequency offset data set ₂ [2 ^N ]Data of the frequency offset end position of the second up-conversion symbol in the Doppler frequency offset data set ₃ [2 ^N ]And the frequency deviation ending position data of the third frequency-raising symbol in the Doppler frequency deviation data set.

Will data [1+2 ^N -K]To data [2*2 ^N -K]Determining the frequency offset data of the second up-conversion symbol in the Doppler frequency offset data set, and converting data [1+2 + ^N -K]To data [3*2 ^N -K]Frequency offset data in the doppler frequency offset data set is determined for the third up-converted symbol.

Step 716, data is written ₂ [1]To data ₂ [2 ^N ]And 2 ^N The standard symbol data are respectively multiplied one by one to obtain 2 ^N Second intermediate result symbol data.

Wherein, the data ₂ [1]To data ₂ [2 ^N ]Frequency offset data for the second up-converted symbol.

Step 717, for step 2 ^N Second intermediate result symbol data carries out 2 ^N Fast Fourier transform of the points to obtain B1]To B2 ^N ]。

Wherein, B < 1 >]To B2 ^N ]Is a frequency domain resultant data set of a second up-converted symbol, where B [1]]To correspond to data ₂ [1]Frequency domain result data of (2) ^N ]To correspond to data ₂ [2 ^N ]The frequency domain result data of (1).

Step 718, the data ₃ [1]To data ₃ [2 ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N And third intermediate result symbol data.

Wherein, the data ₃ [1]To data ₃ [2 ^N ]Frequency offset data for a third up-converted symbol.

Step 719, for 2 ^N Third intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain C1]To C2 ^N ]。

Wherein, C1]To C2 ^N ]Is a frequency domain resultant data set of a third up-converted symbol, where C [1]]To correspond to data ₃ [1]Frequency domain result data of C2 ^N ]To correspond to data ₃ [2 ^N ]The frequency domain result data of (1).

Step 720, from B [1]]To B2 ^N ]To obtain B1]From C1]To C2 ^N ]To obtain C1]Is prepared from B [1]Phase value of (C1)]The phase values of the first and second upconverted symbols are subtracted from each other to obtain a phase difference between the second and third upconverted symbols.

And step 721, obtaining the doppler frequency offset according to the phase difference between the second and third upconverting symbols, the spreading gain and the bandwidth of the upconverting symbols.

In step 721, the doppler frequency offset is obtained by the following equation

Θ/2π*BW/2 ^N

Wherein Θ is a phase difference between the second upconverted symbol and the third upconverted symbol, i.e. Θ is calculated byB[1]Phase value sum C1]Is obtained by subtracting the phase values of (2) ^N BW is the bandwidth of the up-converted symbols for spreading gain.

Step 722, performing doppler compensation on frequency offset data in a doppler frequency offset data set obtained by the subsequent received radio frequency signal.

In step 722, doppler compensation is performed on frequency offset data in a doppler frequency offset data set obtained from a subsequently received radio frequency signal by:

data[k]*e ^iΘk

wherein, data [ k ] is the kth frequency offset data in Doppler frequency offset data set obtained by the subsequent received radio frequency signal, k is the serial number of the frequency offset data in Doppler frequency offset data set obtained by the subsequent received radio frequency signal, theta is the phase difference of the second up-conversion symbol and the third up-conversion symbol, namely theta is obtained by subtracting the phase value of B1 and the phase value of C1, i is an imaginary number symbol.

At this point, signal acquisition is completed.

After step 722, the Doppler frequency offset after Doppler compensation is BW/2 ^N Integer multiples of. At true Doppler shift BW/2 ^N When the integer multiple is greater than the predetermined value, the calculated Θ is 0, so that the signal acquisition method of the embodiment of the disclosure can obtain the residual doppler frequency offset beyond the integer multiple.

Fig. 10 is a diagram illustrating a satellite signal packet format applied to a signal acquisition method according to an exemplary embodiment of the present disclosure. As shown in fig. 10, the satellite signal data packet includes a synchronization header and a data field, wherein the synchronization header includes 6 consecutive up-conversion symbols, i.e., up-conversion symbol 1, up-conversion symbol 2, up-conversion symbol 3, up-conversion symbol 4, up-conversion symbol 5, and up-conversion symbol 6, and the data field immediately follows up-conversion symbol 6. The receiving end of the satellite signal data adopts the signal capturing method of the embodiment of the disclosure, and can lock the Doppler to BW/2 after Doppler capturing is carried out by utilizing the front 6 frequency-increasing symbols ^N And simultaneously achieves bit synchronization for demodulation of the following data field.

In the signal capturing method of the embodiment of the disclosure, the synchronization head only has 6 up-conversion symbols, so that a more efficient chirp spread spectrum communication synchronization head and more efficient capturing are realized, the occupied time of the synchronization head is reduced, and the capturing complexity is reduced.

Fig. 11 is a schematic diagram of a format of a conventional satellite signal data packet, as shown in fig. 11, the conventional satellite signal data packet includes a synchronization header and a data field, and unlike the technical solution of the present disclosure, the synchronization header of the conventional satellite signal data packet includes a synchronization header end symbol after 6 up-conversion symbols in addition to consecutive 6 up-conversion symbols, and the synchronization header end symbol includes an up-conversion end symbol and a down-conversion symbol. In the existing satellite signal data packet format, the frequency-up ending symbol and the frequency-down symbol are added to synchronize the doppler frequency offset to 0 and completely synchronize the bit synchronization, but since the chirp system is a spread spectrum system, this can only improve the demodulation performance by less than 0.5db, but extra symbol time is paid, and the frequency-up ending symbol and the frequency-down symbol need larger demodulation resources, so that the demodulation becomes complicated, and more acquisition uncertainties are introduced.

Fig. 12 is a logic structure diagram of a signal acquisition apparatus according to an exemplary embodiment, as shown in fig. 12, the signal acquisition apparatus 1200 includes a signal receiving module 1201, a frequency offset data obtaining module 1202, a frequency domain result obtaining module 1203, a start position obtaining module 1204, a phase difference obtaining module 1205, a doppler frequency offset obtaining module 1206, and a doppler compensation module 1207.

The signal receiving module 1201 is configured to perform receiving a radio frequency signal, where the radio frequency signal includes a satellite signal, and the satellite signal includes a synchronization header signal, where the synchronization header signal includes a first frequency-boosted symbol, a second frequency-boosted symbol, and a third frequency-boosted symbol that are consecutive, bandwidths of all the frequency-boosted symbols are equal, and spreading gains of all the frequency-boosted symbols are equal.

A frequency offset data obtaining module 1202, configured to perform preprocessing on the radio frequency signal to obtain a doppler frequency offset data set, where the doppler frequency offset data set includes respective frequency offset data of the first frequency-up symbol, the second frequency-up symbol, and the third frequency-up symbol.

A frequency domain result obtaining module 1203 configured to perform a process of obtaining a frequency domain result data set according to the doppler frequency offset data set, the spread spectrum gain of the upconverting symbol, and the standard symbol data, where each frequency domain result data in the frequency domain result data set includes an amplitude value and a phase value.

A start position obtaining module 1204 configured to perform a process of obtaining a start position of the first upconverting symbol in the doppler shift data set by using the amplitude value in the frequency domain result data set.

A phase difference obtaining module 1205 configured to obtain a phase difference between the second and third boosted symbols according to the starting position of the first boosted symbol in the doppler frequency offset data set, the spread spectrum gain and the standard symbol data.

A doppler shift obtaining module 1206 configured to perform obtaining a doppler shift according to the phase difference, the spreading gain, and the bandwidth of the second and third boosted symbols.

And the doppler compensation module 1207 is configured to perform doppler compensation on frequency offset data in a doppler frequency offset data set obtained by a subsequently received radio frequency signal according to a phase difference between the second upconverting symbol and the third upconverting symbol, so as to complete acquisition of a satellite signal.

In some embodiments, the frequency domain result obtaining module 1203 further includes:

a first frequency offset data obtaining submodule configured to perform data [1] obtaining in the Doppler frequency offset data set]To data [2 ] ^N ]Wherein, data [1]]Initial frequency offset data for a Doppler frequency offset data set, 2 ^N For spread spectrum gain, data [2 ] ^N ]For data [1] in data set shifted from Doppler]Starting No. 2 ^N Frequency offset data, wherein N is a positive integer not less than 8;

a first intermediate result symbol data obtaining submodule configured to perform a data [1] conversion]To data [2 ] ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N First intermediate result symbol data;

a first frequency domain result obtaining submodule configured to perform pair 2 ^N First intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set, wherein the frequency domain result data set comprises A [1]]To A < 2 > ^N ]Wherein, A < 1 >]To correspond to data [1]]Frequency domain result data of A [2 ] ^N ]To correspond to data [2 ] ^N ]The frequency domain result data of (1).

In some embodiments, 2 ^N The standard symbol data is:

F(t)=cos(π*(t-2 ^N-1 ) ² /2 ^N )+sin(π*(t-2 ^N-1 ) ² /2 ^N )*i

In some embodiments, the starting position obtaining module 1204 further comprises:

an amplitude value maximum frequency domain result obtaining sub-module configured to perform frequency domain result data of the number of spread spectrum gains from start frequency domain result data of the frequency domain result data set to obtain frequency domain result data of which the amplitude value is maximum;

and the starting position determining submodule is configured to determine the position of the frequency offset data corresponding to the frequency domain result data with the maximum amplitude value in the Doppler frequency offset data set as the starting position of the first frequency-boosting symbol in the Doppler frequency offset data set under the condition that the frequency domain result data with the maximum amplitude value meets the capturing condition.

In some embodiments, the amplitude value maximum frequency domain result obtaining sub-module further comprises:

a first frequency domain result data obtaining sub-module configured to perform obtaining A [1] in the frequency domain result data set]To A < 2 > ^N ]Wherein, A < 1 >]Is the starting frequency domain result data of the frequency domain result data set, A [2 ] ^N ]Is A [1] from the frequency domain result data set]Starting No. 2 ^N Frequency domain result data;

an amplitude value comparison submodule configured to perform a pair A [1]]To A2 ^N ]All of 2 ^N Of result data of frequency domainComparing the amplitude values to obtain frequency domain result data A [ K ] with the maximum amplitude value]K is the serial number of the frequency domain result data with the largest amplitude value in the frequency domain result data set, and K is more than or equal to 1 and less than or equal to 2 ^N 。

In some embodiments, the capture conditions are:

wherein the content of the first and second substances,

is the amplitude value of the kth frequency domain result data, k is more than or equal to 1 and less than or equal to 2 ^N And k is an integer, and N is a positive integer not less than 8.

In some embodiments, the starting position determining sub-module is further configured to perform:

In some embodiments, phase difference obtaining module 1205 includes:

the second frequency offset data obtaining submodule is configured to execute in the Doppler frequency offset data set, and obtain frequency offset data of a second frequency-boosted symbol and frequency offset data of a third frequency-boosted symbol after the first initial position according to the initial position and the spread spectrum gain of the first frequency-boosted symbol in the Doppler frequency offset data set;

a frequency domain result data set obtaining sub-module configured to perform obtaining a frequency domain result data set of the second upconverting symbol and a frequency domain result data set of the third upconverting symbol according to the frequency offset data of the second upconverting symbol, the frequency offset data of the third upconverting symbol, the spread spectrum gain and the standard symbol data, wherein each of the frequency domain result data set of the second upconverting symbol and the frequency domain result data set of the third upconverting symbol includes an amplitude value phase value;

a second frequency domain result data obtaining sub-module configured to perform obtaining, from the frequency domain result data set of the second upconverted symbol and the frequency domain result data set of the third upconverted symbol, a first frequency domain result data of the second upconverted symbol and a first frequency domain result data of the third upconverted symbol, respectively;

a phase difference obtaining sub-module configured to perform obtaining a phase difference of the second and third upconverted symbols according to the first frequency domain result data of the second and third upconverted symbols.

In some embodiments, the second frequency offset data obtaining sub-module comprises:

a frequency offset position data obtaining submodule configured to obtain frequency offset start position data of a second frequency-up symbol, frequency offset start position data of a third frequency-up symbol, frequency offset end position data of the second frequency-up symbol, and frequency offset end position data of the third frequency-up symbol by the following formula:

data ₂ [1]=data[1+2 ^N -K]

data ₃ [1]=data[1+2*2 ^N -K]

data ₂ [2 ^N ]=data[2*2 ^N -K]

data ₃ [2 ^N ]=data[3*2 ^N -K]

wherein K is the serial number of the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set, and K is more than or equal to 1 and less than or equal to 2 ^N ，data ₂ [1]For the frequency deviation starting position data, of the second up-conversion symbol in the Doppler frequency deviation data set ₃ [1]Data of the frequency offset start position of the third up-conversion symbol in the Doppler frequency offset data set ₂ [2 ^N ]Data of the frequency offset end position of the second up-conversion symbol in the Doppler frequency offset data set ₃ [2 ^N ]The third up-converted symbol is in the Doppler frequency offset data setFrequency offset end position data of (1);

a frequency offset data determination submodule configured to perform data [1+2 ^N -K]To data [2*2 ^N -K]Determining the frequency offset data of the second up-conversion symbol in the Doppler frequency offset data set, and converting data [1+2 + ^N -K]To data [3*2 ^N -K]Frequency offset data in the doppler frequency offset data set is determined for the third up-conversion symbol.

In some embodiments, the frequency domain result data set obtaining sub-module further comprises:

a second intermediate result symbol data obtaining submodule configured to perform a data combining operation ₂ [1]To data ₂ [2 ^N ]And 2 ^N The standard symbol data are respectively multiplied one by one to obtain 2 ^N A second intermediate result symbol data, wherein data ₂ [1]To data ₂ [2 ^N ]Frequency offset data for a second up-converted symbol, 2 ^N For spread spectrum gain, N is a positive integer no less than 8;

a second frequency domain result obtaining submodule configured to perform Pair 2 ^N Second intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of a second up-converted symbol, wherein the frequency domain result data set of the second up-converted symbol comprises B [1]]To B2 ^N ]Wherein, B < 1 >]To correspond to data ₂ [1]Frequency domain result data of (2) ^N ]To correspond to data ₂ [2 ^N ]The frequency domain result data of (a);

a third intermediate result symbol data obtaining submodule configured to perform a conversion of data ₃ [1]To data ₃ [2 ^N ]And 2 ^N The standard symbol data are multiplied one by one respectively to obtain 2 ^N A third intermediate result symbol data, wherein data ₃ [1]To data ₃ [2 ^N ]Frequency offset data for a third up-converted symbol;

a third frequency domain result obtaining submodule configured to perform pair 2 ^N Third intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of a third up-converted symbol, wherein the frequency domain of the third up-converted symbolThe result data set includes C [1]]To C2 ^N ]Wherein, C1]To correspond to data ₃ [1]Frequency domain result data of C2 ^N ]To correspond to data ₃ [2 ^N ]The frequency domain result data of (1).

In some embodiments, the second frequency domain result data obtaining sub-module further comprises:

a second up-converted symbol first frequency domain result data obtaining sub-module configured to perform a conversion from B [1]]To B2 ^N ]To obtain B1]Wherein, B < 1 >]To B2 ^N ]Is the frequency domain result data set of the second up-converted symbol, B [1]]First frequency domain result data for a second up-converted symbol;

a third up-converted symbol first frequency domain result data obtaining sub-module configured to perform a conversion from C [1]]To C2 ^N ]To obtain C1]Wherein, C1]To C2 ^N ]Is the frequency domain result data set of the third up-converted symbol, C1]The first frequency domain result data for the third up-converted symbol.

In some embodiments, the phase difference obtaining sub-module is further configured to perform:

In some embodiments, the doppler frequency offset acquisition module 1206 is further configured to perform:

obtaining the Doppler frequency offset by

Θ/2π*BW/2 ^N

Wherein Θ is a phase difference between the second and third upconverted symbols, 2 ^N BW is the bandwidth for the spreading gain.

In some embodiments, the doppler compensation module 1207 is further configured to perform:

data[k]*e ^iΘk

Wherein, data [ k ] is the kth frequency offset data in the Doppler frequency offset data set obtained by the subsequent received radio frequency signal, k is the serial number of the frequency offset data in the Doppler frequency offset data set obtained by the subsequent received radio frequency signal, theta is the phase difference between the second and third upconverting symbols, and i is an imaginary number symbol.

In some embodiments, the frequency offset data obtaining module 1202 further comprises:

the first down-conversion submodule is configured to perform down-conversion on the radio-frequency signal to obtain an intermediate-frequency signal;

the analog-digital sampling sub-module is configured to perform analog-digital sampling on the intermediate frequency signal to obtain a sampling signal;

a first filtering submodule configured to perform digital filtering on the sampled signal to obtain a filtered signal, wherein a filtering bandwidth is 1.3 times a bandwidth of the upconverted symbol;

the second down-conversion submodule is configured to perform digital down-conversion on the filtered signal to obtain a mixed signal containing a zero intermediate frequency signal and an image signal;

the second filtering submodule is configured to filter the mixed signal to obtain a zero intermediate frequency signal;

and the down-sampling submodule is configured to perform down-sampling on the zero intermediate frequency signal to obtain a Doppler frequency offset data set.

In some embodiments, the synchronization header signal includes up to six consecutive up-converted symbols, and the synchronization header signal does not include an end-of-synchronization symbol.

The signal capturing device of the embodiment of the disclosure realizes capturing of a satellite signal only by using an up-conversion symbol in a synchronization header signal of the satellite signal, and therefore, a synchronization header end symbol does not need to be added in the synchronization header signal.

With regard to the signal capturing apparatus in the above-described embodiment, the specific manner in which each unit performs the operation has been described in detail in the embodiment related to the signal capturing method, and will not be elaborated here.

It should be noted that: the foregoing embodiments are merely illustrated by the division of the functional modules, and in practical applications, the above functions may be distributed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

Fig. 13 is a schematic structural diagram of an electronic device provided in an embodiment of the present disclosure. In some embodiments, the electronic device is a server. The electronic device 1300 may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPUs) 1301 and one or more memories 1302, where the memory 1302 stores at least one program code, and the at least one program code is loaded and executed by the processors 1301 to implement the signal capturing method provided in the embodiments. Certainly, the electronic device 1300 may further include components such as a wired or wireless network interface, a keyboard, and an input/output interface, so as to perform input and output, and the electronic device 1300 may further include other components for implementing device functions, which are not described herein again.

In an exemplary embodiment, a computer-readable storage medium comprising at least one instruction, such as a memory comprising at least one instruction, executable by a processor in a computer device to perform the signal acquisition method in the above embodiments is also provided.

Alternatively, the computer-readable storage medium may be a non-transitory computer-readable storage medium, and the non-transitory computer-readable storage medium may include a ROM (Read-Only Memory), a RAM (Random-Access Memory), a CD-ROM (Compact Disc Read-Only Memory), a magnetic tape, a floppy disk, an optical data storage device, and the like, for example.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A method of signal acquisition, comprising:

obtaining a frequency domain result data set according to the Doppler frequency offset data set, the spread spectrum gain of the frequency-increasing symbol and standard symbol data, wherein each frequency domain result data in the frequency domain result data set comprises an amplitude value and a phase value;

obtaining the initial position of the first frequency-increasing symbol in the Doppler frequency offset data set through the amplitude value in the frequency domain result data set;

obtaining a phase difference between the second boosted symbol and the third boosted symbol according to the initial position of the first boosted symbol in the doppler frequency offset data set, the spread spectrum gain, and the standard symbol data;

and performing Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by the subsequently received radio frequency signal according to the phase difference between the second frequency-increasing symbol and the third frequency-increasing symbol, so as to complete the acquisition of the satellite signal.

2. The signal acquisition method of claim 1, wherein obtaining a frequency domain result data set based on the doppler shift data set, the spreading gain of the upconverted symbol and the standard symbol data comprises:

obtaining data [1] in the Doppler frequency offset data set]To data [2 ] ^N ]Wherein, data [1]]Initial frequency offset data for said Doppler frequency offset data set, 2 ^N For the spread spectrum gain, data [2 ] ^N ]For data [1] from the Doppler frequency offset data set]Starting No. 2 ^N Frequency offset data, wherein N is a positive integer not less than 8;

3. The signal acquisition method of claim 2, wherein:

2 is described ^N The standard symbol data is:

F(t)＝cos(π*(t-2 ^N-1 ) ² /2 ^N )+sin(π*(t-2 ^N-1 ) ² /2 ^N )*i

4. The signal acquisition method of claim 1, wherein said obtaining a starting position of the first up-conversion symbol in the doppler frequency offset data set from the amplitude value in the frequency domain result data set comprises:

5. The signal capturing method as claimed in claim 4, wherein the obtaining of the frequency domain result data with the largest amplitude value from the frequency domain result data of the number of spreading gains from the starting frequency domain result data of the frequency domain result data set comprises:

obtaining A [1] in the frequency domain result dataset]To A2 ^N ]Wherein, A < 1 >]Is the starting frequency domain result data of the frequency domain result data set, A [2 ] ^N ]Is A [1] from the frequency domain result data set]Starting No. 2 ^N Frequency domain result data;

to A [1]]To A < 2 > ^N ]All of 2 ^N Comparing the amplitude values of the frequency domain result data to obtain frequency domain result data A [ K ] with the maximum amplitude value]K is the serial number of the frequency domain result data with the largest amplitude value in the frequency domain result data set, and K is more than or equal to 1 and less than or equal to 2 ^N 。

6. The signal acquisition method of claim 4, wherein:

the capture conditions were:

wherein m is _max Amplitude value, m, of the frequency domain result data having the largest amplitude value _k Is the amplitude value of the kth frequency domain result data, k is more than or equal to 1 and less than or equal to 2 ^N K is an integer, and N is a positive integer not less than 8;

the determining, as the initial position of the first upconverting symbol in the doppler frequency offset data set, the position of the frequency offset data corresponding to the frequency domain result data with the largest amplitude value in the doppler frequency offset data set includes:

7. The signal acquisition method of claim 1, wherein said obtaining a phase difference between the second and third boosted symbols according to the starting position of the first boosted symbol in the doppler frequency offset data set, the spreading gain and the standard symbol data comprises:

in the Doppler frequency offset data set, according to the initial position of the first frequency-boosting symbol in the Doppler frequency offset data set and the spread spectrum gain, obtaining frequency offset data of the second frequency-boosting symbol and frequency offset data of the third frequency-boosting symbol after the initial position;

obtaining a frequency domain result data set of the second upconverted symbol and a frequency domain result data set of the third upconverted symbol according to the frequency offset data of the second upconverted symbol, the frequency offset data of the third upconverted symbol, the spreading gain and the standard symbol data, wherein each of the frequency domain result data set of the second upconverted symbol and the frequency domain result data set of the third upconverted symbol comprises an amplitude value and a phase value;

8. The method of capturing signals according to claim 7, wherein said obtaining the frequency offset data of the second up-converted symbol and the frequency offset data of the third up-converted symbol after the initial position according to the initial position of the first up-converted symbol in the doppler frequency offset data set and the spreading gain comprises:

data ₂ [1]＝data[1+2 ^N -K]

data ₃ [1]＝data[1+2*2 ^N -K]

data ₂ [2 ^N ]＝data[2*2 ^N -K]

data ₃ [2 ^N ]＝data[3*2 ^N -K]

will data [1+2 ^N -K]To data [2*2 ^N -K]Determining data [1+2 ] 2 as the frequency offset data of the second up-conversion symbol in the Doppler frequency offset data set ^N -K]To data [3*2 ^N -K]Is determined as the third up-converted symbol is inFrequency offset data in the doppler frequency offset data set.

9. The signal acquisition method of claim 7, wherein said deriving the frequency domain result data set for the second upconverted symbol and the frequency domain result data set for the third upconverted symbol based on the frequency offset data for the second upconverted symbol, the frequency offset data for the third upconverted symbol, the spreading gain, and the standard symbol data comprises:

to the 2 ^N Third intermediate result symbol data go 2 ^N Fast Fourier transform of the points to obtain a frequency domain result data set of the third up-conversion symbol, wherein the frequency domain result data set of the third up-conversion symbol comprises C [1]]To C2 ^N ]Wherein, C1]To correspond to data ₃ [1]Frequency domain result data of (2), C ^N ]To correspond to data ₃ [2 ^N ]The frequency domain result data of (1).

10. The signal acquisition method of claim 7, wherein obtaining the first frequency-domain result data of the second upconverted symbol and the first frequency-domain result data of the third upconverted symbol from the frequency-domain result data set of the second upconverted symbol and the frequency-domain result data set of the third upconverted symbol, respectively, comprises:

from B [1]]To B2 ^N ]To obtain B1]Wherein, B < 1 >]To B2 ^N ]Is a frequency domain result data set of the second upconverted symbol, B [1]]First frequency domain result data for the second up-converted symbol;

11. The method of signal acquisition according to claim 7, wherein said obtaining a phase difference between the second upconverted symbol and the third upconverted symbol according to the first frequency domain result data of the second upconverted symbol and the first frequency domain result data of the third upconverted symbol comprises:

and subtracting the phase value of B1 from the phase value of C1 to obtain the phase difference between the second and third upconverted symbols, wherein B1 is the first frequency domain result data of the second upconverted symbol, and C1 is the first frequency domain result data of the third upconverted symbol.

12. The signal acquisition method of claim 1, wherein the obtaining a doppler frequency offset according to the phase difference between the second upconverted symbol and the third upconverted symbol, the spreading gain and the bandwidth comprises:

obtaining the Doppler frequency offset by the following formula

Θ/2π*BW/2 ^N

13. The method of claim 1, wherein the doppler compensation of the frequency offset data in the doppler frequency offset data set obtained from the subsequently received rf signal according to the phase difference between the second and third boosted symbols comprises:

data[k]*e ^iΘk

14. The signal acquisition method of claim 1, wherein the pre-processing the radio frequency signal to obtain a doppler frequency offset data set comprises:

filtering the mixed signal to obtain the zero intermediate frequency signal;

15. The signal acquisition method according to any one of claims 1 to 14, wherein:

the synchronization header signal includes six consecutive up-converted symbols at most, and the synchronization header signal does not include a synchronization header end symbol.

16. A signal acquisition device, comprising:

the signal receiving module is configured to perform receiving of a radio frequency signal, wherein the radio frequency signal includes a satellite signal, and the satellite signal includes a synchronization header signal, wherein the synchronization header signal includes a first frequency-boosted symbol, a second frequency-boosted symbol, and a third frequency-boosted symbol that are consecutive, bandwidths of all the frequency-boosted symbols are equal, and spreading gains of all the frequency-boosted symbols are equal;

a frequency offset data obtaining module configured to perform preprocessing on the radio frequency signal to obtain a doppler frequency offset data set, where the doppler frequency offset data set includes frequency offset data of each of the first frequency-up symbol, the second frequency-up symbol, and the third frequency-up symbol;

a frequency domain result obtaining module configured to perform obtaining a frequency domain result data set according to the doppler frequency offset data set, the spread spectrum gain of the upconverting symbol, and standard symbol data, wherein each frequency domain result data in the frequency domain result data set includes an amplitude value and a phase value;

and the Doppler compensation module is configured to perform Doppler compensation on frequency offset data in a Doppler frequency offset data set obtained by the subsequently received radio frequency signal according to the phase difference between the second frequency-boosting symbol and the third frequency-boosting symbol, so as to complete acquisition of the satellite signal.

17. An electronic device, comprising:

a processor;

a memory for storing executable instructions of the processor;

wherein the processor is configured to execute the executable instructions to implement the signal acquisition method of any one of claims 1 to 15.

18. A computer-readable storage medium having at least one instruction thereon which, when executed by a processor of an electronic device, enables the electronic device to implement the signal acquisition method of any one of claims 1 to 15.