CN117240411B - Burst frame capturing method, device and equipment - Google Patents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a burst frame capturing method, a device and equipment, wherein a transmitting end converts burst frames into radio frequency signals and transmits the radio frequency signals; the receiving end receives the radio frequency signal, captures the pilot frequency segment signal in the burst frame to estimate the starting point and Doppler frequency offset of the burst frame. The preamble of the burst frame format sent by the sending end adopts a single carrier debugging mode, so that signals can be rapidly captured by only carrying out FFT at the receiving end, the receiving end configures parameters such as FFT coherent integration length, signal capturing search steps, frame length and the like in an online configuration mode, and captures pilot frequency segment signals in the burst frame to estimate the starting point and Doppler frequency offset of the burst frame. The invention can support the rapid capture of signals in various scenes.
Description
Technical Field
The present invention relates to the field of signal capturing technologies, and in particular, to a burst frame capturing method, device and equipment.
Background
In the applications of TDMA (time division multiple access) system, terrestrial cellular radio and some satellite-to-ground communication systems, etc., a burst communication mode is adopted to transmit data, generally, in the burst communication system, in order to enable a receiving end to quickly estimate carrier frequency difference and bit deviation, a known preamble, i.e. a pilot sequence, is usually carried in each burst frame, and the receiving end captures a burst signal by using the known pilot sequence, i.e. signal arrival detection and coarse estimation of phase and frequency of a received signal, the capturing of the burst signal can be implemented on a time domain or a frequency domain, and compared with the time domain algorithm, a frequency domain algorithm has better noise suppression capability and is suitable for a low signal-to-noise ratio environment. However, in the current frequency domain capturing algorithm, one is that a large amount of nonlinear operations such as multiplication exist for capturing a high-order modulation signal, so that the calculated amount is large, the capturing time is too long, and the other is that most of capturing algorithms are only suitable for capturing under a specific scene and do not have the defects of flexible configuration and the like. Therefore, a method with small calculation amount and capable of supporting the fast signal capturing in the on-line flexible configuration is needed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a burst frame capturing method, a burst frame capturing device and burst frame capturing equipment.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a burst frame capturing method, including:
(1) The transmitting end transmits burst frames: converting the burst frame into a radio frequency signal and then sending out the radio frequency signal;
(2) The receiving end captures burst frames: and receiving the radio frequency signal, and capturing a pilot frequency segment signal in the burst frame to estimate the starting point and Doppler frequency offset of the burst frame.
In another aspect, the present invention provides a burst frame including pilot segment bit information and data segment bit information, the pilot segment bit information in the pilot segment being all "0" bit information.
The invention provides a method for transmitting burst frames by a transmitting end, which comprises the following steps:
(1.1) the full 0 bit information of the pilot sequence in the burst frame is changed into full +1 after bipolar IQ conversion, and the bit information of the data segment in the burst frame is changed into effective information containing +1 and 1 after bipolar IQ conversion;
and (1.2) carrying out carrier modulation on the burst frame processed in the step (1.1) to obtain a radio frequency signal, and then sending the radio frequency signal, wherein the radio frequency signal corresponding to a pilot frequency segment in the burst frame sent after the carrier modulation is a single-frequency carrier signal which does not contain effective modulation information and a band signal which contains effective modulation information.
As a preferred embodiment, there is provided a method for capturing burst frames at a receiving end, including:
(2.1) receiving a radio frequency signal;
(2.2) down-converting the received radio frequency signal to an intermediate frequency signal via radio frequency;
(2.3) ADC sampling is carried out on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
(2.3) performing digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency to obtain a zero intermediate frequency digital signal;
(2.4) the zero intermediate frequency digital signals enter a buffer memory, and the zero intermediate frequency digital signals in the buffer memory are counted;
(2.5) judging whether the number of the zero intermediate frequency digital signals currently entering the buffer memory reaches the current set number in real time, if so, turning to the step (2.6), and if not, continuing to wait until the number of the zero intermediate frequency digital signals currently entering the buffer memory reaches the current set number;
(2.6) extracting the zero intermediate frequency digital signals with the current set number from the buffer memory for FFT calculation to obtain peak value peek, mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signal;
(2.7) according to peak value peek and mean, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold of successful capturing peak-to-average ratio, judging whether the burst frame is successfully captured, if so, converting to the step (2.8); if the burst frame capturing fails, the step (2.5) is switched to continue the capturing of the next cycle;
(2.8) calculating a captured Doppler frequency offset result fdopper according to the peak index idx, configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset signal length frame_len corresponding to the burst frame, and turning to the step (2.9);
and (2.9) outputting the obtained Doppler frequency offset result fdopper and the sampling point data of the whole burst frame of one frame as capturing results, and then entering the step (2.5) to continue the capturing of the next cycle.
In another aspect, the present invention provides a burst frame capturing apparatus for capturing a pilot segment signal in a burst frame to estimate a start point and a doppler frequency offset of the burst frame, including:
the receiving antenna is used for receiving the radio frequency signals sent by the sending end;
the radio frequency down-conversion module is used for down-converting the received radio frequency signal into an intermediate frequency signal through radio frequency;
the ADC intermediate frequency sampling module is used for carrying out ADC sampling on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
the digital down-conversion module is used for carrying out digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency so as to obtain a zero intermediate frequency digital signal;
the storage module is used for storing the zero intermediate frequency digital signals;
the sampling point counting module is used for counting zero intermediate frequency digital signals entering the storage module;
the sampling point counter control module is used for judging whether the number of zero intermediate frequency digital signals currently entering the storage module reaches the current set number;
the FFT module is used for FFT calculation;
the control and scheduling module is used for configuring a signal acquisition sampling point starting value sp, a signal acquisition search stepping value step, an acquisition coherent integration length cor_len, a signal length frame_len corresponding to a frame of burst frame and an acquisition success peak-to-average ratio threshold; the sampling point counter control module is used for acquiring the judgment result of the sampling point counter control module, and extracting the zero intermediate frequency digital signals with the current set number from the storage module to the FFT module; obtaining peak value peek, average mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signal through an FFT module; according to peak value peek and mean value, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold for successful capturing, and judging whether capturing is successful or not; calculating a captured Doppler frequency offset result fdopper according to the peak index idx, configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset signal length frame_len corresponding to one frame burst frame, and outputting the obtained Doppler frequency offset result fdopper and sampling point data of the complete one frame burst frame as capturing results.
In another aspect, there is provided a burst frame capturing apparatus, including:
the transmitting end is used for converting the burst frame into a radio frequency signal and transmitting the radio frequency signal;
the receiving end is used for receiving the radio frequency signals and capturing pilot frequency segment signals in the burst frame to estimate the starting point and Doppler frequency offset of the burst frame.
Further, the receiving end comprises a burst frame capturing device.
Compared with the prior art, the invention has the technical effects that:
aiming at the problems that the complexity of the capturing algorithm of the current burst signal is high and flexible configuration is not supported, and the like, the invention adopts a single carrier debugging mode through the preamble of the frame format of the transmitting section, so that the burst frame can be rapidly captured only by carrying out FFT (fast Fourier transform) in the receiving section, and parameters such as FFT coherent integration length, signal capturing searching steps, frame length and the like can be configured through an online configuration mode in the receiving section, so that a set of method flow can support rapid capturing of signals in various scenes through configuration, and further, the integrity of the captured burst frame signal can be ensured through judging whether the currently captured burst frame is complete or not.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a burst frame format provided in one embodiment;
fig. 2 is a schematic structural diagram of a burst frame capturing device provided in an embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In an embodiment of the present invention, there is provided a burst frame capturing method, including:
(1) The transmitting end transmits burst frames: converting the burst frame into a radio frequency signal and then sending out the radio frequency signal;
(2) The receiving end captures burst frames: and receiving the radio frequency signal, and capturing a pilot frequency segment signal in the burst frame to estimate the starting point and Doppler frequency offset of the burst frame.
Referring to fig. 1, in one embodiment, a burst frame is provided, the burst frame includes pilot segment bit information and data segment bit information, and the pilot segment bit information in the pilot segment is all "0" bit information.
When the transmitting end designs the transmitting frame format, a section of pilot data is transmitted before the useful data is transmitted, and the pilot data is a known signal to the transmitting end and the receiving end, so that the receiving end can quickly capture the frame by using the section of pilot data when receiving the signal frame. In this embodiment, the pilot frequency segment bit information in the pilot frequency segment is all "0" bit information, so that the processing calculation amount during capturing by the receiving end can be reduced.
In one embodiment, a method for transmitting a burst frame by a transmitting end is provided, including:
(1.1) the full 0 bit information of the pilot sequence in the burst frame is changed into full +1 after bipolar IQ conversion, and the bit information of the data segment in the burst frame is changed into effective information containing +1 and 1 after bipolar IQ conversion;
and (1.2) carrying out carrier modulation on the burst frame processed in the step (1.1) to obtain a radio frequency signal, and then sending the radio frequency signal, wherein the radio frequency signal corresponding to a pilot frequency segment in the burst frame sent after the carrier modulation is a single-frequency carrier signal which does not contain effective modulation information and a band signal which contains effective modulation information.
It is understood that carrier modulation is well known in the art, namely: the digital signal after IQ modulation is divided into two paths of signals, i.e. an I path signal and a Q path signal, and carrier modulation is as follows: which is a kind ofMedium I-way signal multiplicationQ-way signal multiplied by->Pi is the circumferential rate, fc is the radio frequency carrier frequency point of the signal, and t is the time variable; and adding the two signals to complete the modulation from the digital signal to the radio frequency signal.
In an embodiment, a transmitting end is provided, and the method for transmitting a burst frame by using the transmitting end provided in the foregoing embodiment is used to transmit a burst frame, where a frame format of the burst frame is shown in fig. 1, and the burst frame includes pilot segment bit information and data segment bit information, and the pilot segment bit information in the pilot segment is all "0" bit information.
An embodiment provides a method for capturing a burst frame by a receiving end, which is used for capturing the burst frame sent by the sending end in the above embodiment, and the steps include:
(2.1) receiving a radio frequency signal;
(2.2) down-converting the received radio frequency signal to an intermediate frequency signal via radio frequency;
(2.3) ADC sampling is carried out on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
(2.3) performing digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency to obtain a zero intermediate frequency digital signal;
(2.4) the zero intermediate frequency digital signals enter a buffer memory, and the zero intermediate frequency digital signals in the buffer memory are counted;
(2.5) judging whether the number of the zero intermediate frequency digital signals currently entering the buffer memory reaches the current set number in real time, if so, turning to the step (2.6), and if not, continuing to wait until the number of the zero intermediate frequency digital signals currently entering the buffer memory reaches the current set number;
(2.6) extracting the zero intermediate frequency digital signals with the current set number from the buffer memory as current segment signals for FFT calculation, and obtaining peak value peek, mean value mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signals;
(2.7) according to peak value peek and mean, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold of successful capturing peak-to-average ratio, judging whether the burst frame is successfully captured, if so, converting to the step (2.8); if the burst frame capturing fails, the step (2.5) is switched to continue the capturing of the next cycle;
(2.8) calculating a captured Doppler frequency offset result fdopper according to the peak index idx, and configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset length frame_len of a signal corresponding to the burst frame, and turning to the step (2.9);
and (2.9) outputting the obtained Doppler frequency offset result fdopper and the sampling point data of the whole burst frame of one frame as capturing results, and then entering the step (2.5) to continue the capturing of the next cycle.
Further, in the step (2.7), if the peak-to-average ratio is greater than the threshold of successful capture peak-to-average ratio, the burst frame is considered to be successfully captured, and the burst frame capture success represents that the current segment signal contains a burst frame header; and if the peak-to-average ratio is smaller than the threshold of successful capture, the burst frame capture is considered to be failed, and if the burst frame capture is failed, the current section signal does not contain the burst frame header.
In step (2.7), whether burst frame capture is successful is determined by whether there is a burst frame header in the current segment signal. After the burst frame is successfully captured in the step (2.7), in order to ensure that the captured burst frame is a complete burst frame of one frame, the invention needs to carry out complete burst frame judgment in the subsequent step. If only a part of burst frame signals containing frame heads are captured currently, the whole burst frame signals of one frame need to be waited for to enter the buffer memory and then taken out of the buffer memory, and sampling point data of the whole burst frame of one frame is obtained and output as a capturing result.
Specifically, in the step (2.9), firstly, judging a complete burst frame, according to the starting point and the ending point of the currently captured burst frame configured in the step (2.8) and the count of sampling points, judging whether the currently set number of zero intermediate frequency digital signals contain the sampling points of the complete burst frame of one frame or not in the step (2.6), if so, outputting the obtained Doppler frequency offset result fdopper and the sampling point data of the complete burst frame of one frame as capturing results, and then entering the step (2.5) to continue the next cycle capturing; if the current set number of zero intermediate frequency digital signals do not contain the sampling points of the complete burst frame of one frame, determining the number of the sampling points which are still lacking in the burst frame, waiting for the zero intermediate frequency digital signals in the buffer until the sampling points of the complete burst frame of one frame are obtained, outputting the obtained Doppler frequency offset result fdopper and the sampling point data of the complete burst frame of one frame as capturing results, and then entering the step (2.5) to continue the next cycle capturing.
Further, in the step (2.5), the method for setting the current set number is: if the burst frame capturing is performed for the first time, the current set number is the preset capturing coherent integration length cor_len plus the signal capturing sampling point starting value sp; as currently is the firstSub-burst frame capture, wherein->The current set number is the preset capture coherent integration length cor_len plus the signal capture sampling point start value sp plus +.>The multiplied signal captures the search step value, i.e. the current set number is +.>。
In the above embodiment, when the receiving end captures a burst frame, parameters such as the signal capturing sampling point start value sp, the signal capturing search step value step, the capturing coherent integration length cor_len, the signal length frame_len corresponding to a burst frame of one frame, and the capturing success peak-to-average ratio threshold can be configured in an online configuration mode, so that a set of method flows can support rapid capturing of signals in various scenes.
In one embodiment, referring to fig. 2, a burst frame capturing apparatus is provided for capturing pilot segment signals in a burst frame to estimate a start point and a doppler frequency offset of the burst frame, including:
the receiving antenna is used for receiving the radio frequency signals sent by the sending end;
the radio frequency down-conversion module is used for down-converting the received radio frequency signal into an intermediate frequency signal through radio frequency;
the ADC intermediate frequency sampling module is used for carrying out ADC sampling on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
the digital down-conversion module is used for carrying out digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency so as to obtain a zero intermediate frequency digital signal;
the storage module is used for storing the zero intermediate frequency digital signals;
the sampling point counting module is used for counting zero intermediate frequency digital signals entering the storage module;
the sampling point counter control module is used for judging whether the number of zero intermediate frequency digital signals currently entering the storage module reaches the current set number;
the FFT module is used for FFT calculation;
the control and scheduling module is used for configuring a signal acquisition sampling point starting value sp, a signal acquisition search stepping value step, an acquisition coherent integration length cor_len, a signal length frame_len corresponding to a frame of burst frame and an acquisition success peak-to-average ratio threshold; the sampling point counter control module is used for acquiring the judgment result of the sampling point counter control module, and extracting the zero intermediate frequency digital signals with the current set number from the storage module to the FFT module; obtaining peak value peek, average mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signal through an FFT module; according to peak value peek and mean value, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold for successful capturing, and judging whether capturing is successful or not; calculating a captured Doppler frequency offset result fdopper according to the peak index idx, configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset signal length frame_len corresponding to one frame burst frame, and outputting the obtained Doppler frequency offset result fdopper and sampling point data of the complete one frame burst frame as capturing results.
The implementation method of each module may be the method described in any of the foregoing embodiments, which is not described herein.
In another aspect, there is provided a burst frame capturing apparatus, including:
the transmitting end is used for converting the burst frame into a radio frequency signal and transmitting the radio frequency signal;
the receiving end is used for receiving the radio frequency signals and capturing pilot frequency segment signals in the burst frame to estimate the starting point and Doppler frequency offset of the burst frame.
Further, the burst frame capturing device includes:
the receiving antenna is used for receiving the radio frequency signals sent by the sending end;
the radio frequency down-conversion module is used for down-converting the received radio frequency signal into an intermediate frequency signal through radio frequency;
the ADC intermediate frequency sampling module is used for carrying out ADC sampling on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
the digital down-conversion module is used for carrying out digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency so as to obtain a zero intermediate frequency digital signal;
the storage module is used for storing the zero intermediate frequency digital signals;
the sampling point counting module is used for counting zero intermediate frequency digital signals entering the storage module;
the sampling point counter control module is used for judging whether the number of zero intermediate frequency digital signals currently entering the storage module reaches the current set number;
the FFT module is used for FFT calculation;
the control and scheduling module is used for configuring a signal acquisition sampling point starting value sp, a signal acquisition search stepping value step, an acquisition coherent integration length cor_len, a length frame_len of a radio frequency signal corresponding to a frame burst frame and an acquisition success peak-to-average ratio threshold; the sampling point counter control module is used for acquiring the judgment result of the sampling point counter control module, and extracting the zero intermediate frequency digital signals with the current set number from the storage module to the FFT module; obtaining peak value peek, average mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment radio frequency signal through an FFT module; according to peak value peek and mean value, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold for successful capturing, and judging whether capturing is successful or not; calculating a captured Doppler frequency offset result fdopper according to the peak index idx, configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset signal length frame_len corresponding to one frame burst frame, and outputting the obtained Doppler frequency offset result fdopper and sampling point data of the complete one frame burst frame as capturing results.
The implementation method of each module may be the method described in any of the foregoing embodiments, which is not described herein.
The invention is not a matter of the known technology.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A burst frame capture method, comprising:
(1) The transmitting end transmits burst frames: the method for transmitting the burst frame by the transmitting end comprises the steps of:
(1.1) the full 0 bit information of the pilot sequence in the burst frame is changed into full +1 after bipolar IQ conversion, and the bit information of the data segment in the burst frame is changed into effective information containing +1 and 1 after bipolar IQ conversion;
(1.2) carrying out carrier modulation on the burst frame processed in the step (1.1) to obtain a radio frequency signal, and then sending the radio frequency signal, wherein the radio frequency signal corresponding to a pilot frequency segment in the burst frame sent after the carrier modulation is a single-frequency carrier signal which does not contain effective modulation information and a band signal which contains effective modulation information;
(2) The receiving end captures burst frames: receiving a radio frequency signal, capturing a pilot frequency segment signal in a burst frame to estimate a starting point and Doppler frequency offset of the burst frame, wherein the method comprises the following steps:
(2.1) receiving a radio frequency signal;
(2.2) down-converting the received radio frequency signal to an intermediate frequency signal via radio frequency;
(2.3) ADC sampling is carried out on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
(2.3) performing digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency to obtain a zero intermediate frequency digital signal;
(2.4) the zero intermediate frequency digital signals enter a buffer memory, and the zero intermediate frequency digital signals in the buffer memory are counted;
(2.5) judging whether the number of the zero intermediate frequency digital signals currently entering the buffer memory reaches the current set number in real time, if so, turning to the step (2.6), and if not, continuing to wait until the number of the zero intermediate frequency digital signals currently entering the buffer memory reaches the current set number;
(2.6) extracting the zero intermediate frequency digital signals with the current set number from the buffer memory as current segment signals for FFT calculation, and obtaining peak value peek, mean value mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signals;
(2.7) according to peak value peek and mean, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold of successful capturing peak-to-average ratio, judging whether the burst frame is successfully captured, if so, converting to the step (2.8); if the burst frame capturing fails, the step (2.5) is switched to continue the capturing of the next cycle;
(2.8) calculating a captured Doppler frequency offset result fdopper according to the peak index idx, and configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset length frame_len of a signal corresponding to the burst frame, and turning to the step (2.9);
and (2.9) outputting the obtained Doppler frequency offset result fdopper and the sampling point data of the whole burst frame of one frame as capturing results, and then entering the step (2.5) to continue the capturing of the next cycle.
2. The burst frame capturing method according to claim 1, wherein in the step (2.7), if the peak-to-average ratio is greater than the threshold for capturing success, the burst frame capturing is considered to be successful, and the burst frame capturing success represents that the current segment signal includes a burst frame header; and if the peak-to-average ratio is smaller than the threshold of successful capture, the burst frame capture is considered to be failed, and if the burst frame capture is failed, the current section signal does not contain the burst frame header.
3. The burst frame capturing method according to claim 1 or claim 2, wherein in the step (2.9), a complete burst frame is first determined, according to the start point and the end point of the currently captured burst frame configured in the step (2.8) and the sampling point count, the step (2.6) of determining whether the currently set number of zero intermediate frequency digital signals contain the sampling point of the complete burst frame of one frame or not is fetched from the storage module, if so, the obtained doppler frequency offset result fdopper and the sampling point data of the complete burst frame of one frame are output as capturing results, and then the next cycle capturing is continued in the step (2.5).
4. The burst frame capturing method according to claim 3, wherein in the step (2.9), if the determining step (2.6) takes out from the storage module that the current set number of zero intermediate frequency digital signals does not include the sampling points of the complete burst frame of one frame, determining the number of sampling points still missing in the burst frame, waiting for entering the zero intermediate frequency digital signals in the buffer until the sampling points of the complete burst frame of one frame are obtained, outputting the obtained doppler frequency offset result fdopper and the sampling point data of the complete burst frame of one frame as capturing results, and then proceeding to the step (2.5) to continue the next cycle capturing.
5. The burst frame capturing method according to claim 1, wherein in the step (2.5), the setting method of the current set number is: if the burst frame capturing is performed for the first time, the current set number is the preset capturing coherent integration length cor_len plus the signal capturing sampling point starting value sp; as is currentlyiSecondary burst frame capture, whereiniMore than or equal to 2, the current set number is the preset capture coherent integration length cor_len plus the signal capture sampling point starting value sp plus [ ]i-1) times the signal acquisition search step value.
6. The burst frame capturing device is configured to capture a pilot frequency segment signal in a burst frame to estimate a start point and a doppler frequency offset of the burst frame, where the burst frame includes pilot frequency segment bit information and data segment bit information, and the pilot frequency segment bit information in the pilot frequency segment is all "0" bit information, and includes:
the receiving antenna is used for receiving the radio frequency signals sent by the sending end; the method for transmitting the burst frame by the transmitting end comprises the following steps:
(1.1) the full 0 bit information of the pilot sequence in the burst frame is changed into full +1 after bipolar IQ conversion, and the bit information of the data segment in the burst frame is changed into effective information containing +1 and 1 after bipolar IQ conversion;
(1.2) modulating the burst frame processed in the step (1.1) into a radio frequency signal by a carrier wave, and then transmitting the radio frequency signal, wherein the radio frequency signal corresponding to a pilot frequency segment in the burst frame transmitted after the carrier wave modulation is a single-frequency carrier wave signal without effective modulation information and a band signal with effective modulation information
The radio frequency down-conversion module is used for down-converting the received radio frequency signal into an intermediate frequency signal through radio frequency;
the ADC intermediate frequency sampling module is used for carrying out ADC sampling on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
the digital down-conversion module is used for carrying out digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency so as to obtain a zero intermediate frequency digital signal;
the storage module is used for storing the zero intermediate frequency digital signals;
the sampling point counting module is used for counting zero intermediate frequency digital signals entering the storage module;
the sampling point counter control module is used for judging whether the number of zero intermediate frequency digital signals currently entering the storage module reaches the current set number;
the FFT module is used for FFT calculation;
the control and scheduling module is used for configuring a signal acquisition sampling point starting value sp, a signal acquisition search stepping value step, an acquisition coherent integration length cor_len, a length frame_len of a signal corresponding to a frame of burst frame and an acquisition success peak-to-average ratio threshold; the sampling point counter control module is used for acquiring the judgment result of the sampling point counter control module, and extracting the zero intermediate frequency digital signals with the current set number from the storage module to the FFT module; obtaining peak value peek, average mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signal through an FFT module; according to peak value peek and mean value, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold for successful capturing, and judging whether capturing is successful or not; calculating a captured Doppler frequency offset result fdopyer according to the peak index idx, configuring a starting point and an ending point of a currently captured burst frame according to the count value cnt of the data segment and the length frame_len of a signal corresponding to a preset burst frame, and outputting the obtained Doppler frequency offset result fdopyer and sampling point data of a complete burst frame as capturing results.
7. A burst frame capture device, comprising:
the transmitting end is used for converting the burst frame into a radio frequency signal and then transmitting the radio frequency signal, the burst frame comprises pilot frequency segment bit information and data segment bit information, the pilot frequency segment bit information in the pilot frequency segment is all '0' bit information, and the method for transmitting the burst frame by the transmitting end comprises the following steps:
(1.1) the full 0 bit information of the pilot sequence in the burst frame is changed into full +1 after bipolar IQ conversion, and the bit information of the data segment in the burst frame is changed into effective information containing +1 and 1 after bipolar IQ conversion;
(1.2) carrying out carrier modulation on the burst frame processed in the step (1.1) to obtain a radio frequency signal, and then sending the radio frequency signal, wherein the radio frequency signal corresponding to a pilot frequency segment in the burst frame sent after the carrier modulation is a single-frequency carrier signal which does not contain effective modulation information and a band signal which contains effective modulation information;
the receiving end is used for receiving radio frequency signals and capturing pilot frequency segment signals in burst frames to estimate the starting point and Doppler frequency offset of the burst frames, wherein the receiving end comprises a burst frame capturing device, and the burst frame capturing device comprises:
the receiving antenna is used for receiving the radio frequency signals sent by the sending end;
the radio frequency down-conversion module is used for down-converting the received radio frequency signal into an intermediate frequency signal through radio frequency;
the ADC intermediate frequency sampling module is used for carrying out ADC sampling on the intermediate frequency signal to obtain an intermediate frequency sampling signal;
the digital down-conversion module is used for carrying out digital down-conversion on the intermediate frequency sampling signal to zero intermediate frequency so as to obtain a zero intermediate frequency digital signal;
the storage module is used for storing the zero intermediate frequency digital signals;
the sampling point counting module is used for counting zero intermediate frequency digital signals entering the storage module;
the sampling point counter control module is used for judging whether the number of zero intermediate frequency digital signals currently entering the storage module reaches the current set number;
the FFT module is used for FFT calculation;
the control and scheduling module is used for configuring a signal acquisition sampling point starting value sp, a signal acquisition search stepping value step, an acquisition coherent integration length cor_len, a length frame_len of a signal corresponding to a frame of burst frame and an acquisition success peak-to-average ratio threshold; the sampling point counter control module is used for acquiring the judgment result of the sampling point counter control module, and extracting the zero intermediate frequency digital signals with the current set number from the storage module to the FFT module; obtaining peak value peek, average mean, peak index idx and corresponding data segment count value cnt of FFT of the current segment signal through an FFT module; according to peak value peek and mean value, obtaining peak-to-average ratio, comparing the obtained peak-to-average ratio with a threshold for successful capturing, and judging whether capturing is successful or not; calculating a captured Doppler frequency offset result fdopper according to the peak index idx, configuring a starting point and an ending point of a currently captured burst frame according to the data segment count value cnt and a preset signal length frame_len corresponding to one frame burst frame, and outputting the obtained Doppler frequency offset result fdopper and sampling point data of the complete one frame burst frame as capturing results.
8. The burst frame capture device of claim 7, wherein the burst frame comprises pilot segment bit information and data segment bit information, the pilot segment bit information in the pilot segment being all "0" bit information.
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