CN117479288A - Timing synchronization method and device for burst signal test - Google Patents
Timing synchronization method and device for burst signal test Download PDFInfo
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Abstract
The invention discloses a timing synchronization method and a device for burst signal test, wherein the method comprises the following steps: acquiring data information of an air interface signal; performing power triggering on the air interface signal data information to obtain an effective burst signal; performing power sampling on the effective burst signal to obtain an accurate burst signal; and carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal. Compared with a general direct sliding correlation method, the method has lower detection time delay, the calculation complexity of power detection and power sampling processing in the burst signal detection stage is lower than that of sliding correlation operation, and sliding correlation is carried out after burst signal detection is finished, so that the timing accuracy can be ensured, long-time correlation operation is avoided, and the synchronization time is effectively reduced.
Description
Technical Field
The present invention relates to the field of digital signal processing technologies, and in particular, to a timing synchronization method and apparatus for burst signal testing.
Background
The satellite communication system communicates in a multi-sampling burst mode, and forward return signals are transmitted and received in burst units. The burst signal communication has two characteristics, namely, the signal transmission adopts a burst structure for signal transmission, and in order to ensure the performance, the burst structure comprises known unique words as auxiliary data; and secondly, different sending time slots and receiving time slots are allocated for different users in the network. The above two characteristics are discontinuous for the ue, which requires the ue to accurately determine the accurate burst position of the received signal, that is, timing synchronization is required. The burst signal timing synchronization technology mainly realizes the capture of burst signals, determines the initial position of the burst signals from noise, and cuts out the required effective burst signals for subsequent signal processing.
For burst signal testing, timing synchronization issues also need to be considered. For example, in the radio frequency index test of the burst signal, the effective burst signal is accurately acquired under the condition that the arrival time of the burst signal is unknown before the radio frequency index calculation. Currently, the timing synchronization of burst signals is mostly performed with sliding correlation based on the correlation of unique words in burst signals, and different timing positions are determined by using correlation peaks. In order not to lose effective burst signals, the method needs to slide and correlate the sampled data for a long time until the burst position is found. When the unique word is longer, the time complexity of the sliding correlation operation is higher, and the time delay of timing synchronization is increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a timing synchronization method and a timing synchronization device for burst signal test, which adopt a timing synchronization scheme of three steps of power triggering, power sampling and burst synchronization, reduce the processing time of the timing synchronization, effectively reduce the operation complexity of a burst capturing stage and reduce the timing synchronization time delay.
In order to solve the above technical problems, a first aspect of the present invention discloses a timing synchronization method for burst signal testing, where the method includes:
s1, acquiring data information of an air interface signal;
s2, performing power triggering on the air interface signal data information to obtain an effective burst signal;
s3, performing power sampling on the effective burst signal to obtain an accurate burst signal;
s4, carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal.
In a first aspect of the embodiment of the present invention, the performing power triggering on the air interface signal data information to obtain an effective burst signal includes:
s21, sampling the air interface signal data information to obtain sampling data information;
s22, filtering the sampled data information to obtain a baseband IQ signal;
s23, performing power calculation on the baseband IQ signal to obtain an effective burst signal.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the baseband IQ signal x (n) is:
x(n)＝I(n)+jQ(n)
in the formula, N is the count of baseband IQ sampling points, the data information symbol length of the air interface signal is N, the signal sampling multiplying power is M, and the number of the sampling points of a complete baseband IQ signal x (N) is N multiplied by M.
In a first aspect of the embodiment of the present invention, the performing power calculation on the baseband IQ signal to obtain an effective burst signal includes:
s231, performing power calculation on any one sampling point of the baseband IQ signal to obtain any one sampling point power value;
s232, comparing the power value of any sampling point with a preset power trigger threshold value to obtain power trigger information of the sampling point;
the power trigger information is:
when P (n) is more than or equal to P and P (n-1) is less than P, the power triggering of the sampling point is successful, the power triggering information is 1, otherwise, the triggering is failed, the power triggering information is 0, P (n) is the power value of the nth sampling point, P (n-1) is the power value of the nth-1 sampling point, and P is a preset power triggering threshold value;
s233, recording the power trigger information of each sampling point of the baseband IQ signal to obtain an effective burst signal.
In a first aspect of the embodiment of the present invention, the power sampling the effective burst signal to obtain an accurate burst signal includes:
s31, taking the 1 st sampling point with the power triggering information of the effective burst signal being 1 as the start, intercepting N multiplied by M sampling points to obtain a truncated burst signal;
s32, sampling the truncated burst signal by taking L as an interval to obtain a resampled burst signal, wherein the resampled burst signal comprises (N multiplied by M)/L sampling points, L is a positive integer, N is the data information symbol length of the air interface signal, and M is the signal sampling multiplying power;
s33, calculating the power values of all sampling points of the resampled burst signal, judging whether the power values of all sampling points are larger than a power trigger threshold value P, and if so, sampling and detecting successfully, wherein the effective burst signal is an accurate burst signal.
In a first aspect of the embodiment of the present invention, the performing burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal includes:
s41, performing sliding correlation processing on the accurate burst signal to obtain a sliding correlation signal;
and S42, detecting the maximum value of the sliding related signal to obtain timing synchronization information.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the sliding related signal is:
in the formula, corr n For sliding the correlation signal x 1 [n]To signal accurately the process, x uw (N) is a locally pre-stored unique word, M is a signal sampling rate, i=1, 2, …, (N) uw ×M)，N uw Is the length of the unique word.
In a first aspect of the embodiment of the present invention, the detecting the maximum value of the sliding correlation signal to obtain timing synchronization information of the burst signal includes:
s421, performing maximum detection on the sliding correlation signal by using a sliding correlation signal detection model to obtain timing synchronization optimal time information;
the sliding related signal detection model is as follows:
in the method, in the process of the invention,corr for timing synchronization of optimal time information n For the sliding-related signals, n=1 to (n×m-N) uw ×M)，
S422, sampling point position extraction is carried out on the timing synchronization optimal time information, and timing synchronization information of the burst signal is obtained.
The second aspect of the embodiment of the invention discloses a timing synchronization device for burst signal test, which comprises:
the signal acquisition module is used for acquiring data information of the air interface signal;
the power triggering module is used for performing power triggering on the air interface signal data information to obtain an effective burst signal;
the power sampling module is used for performing power sampling on the effective burst signal to obtain an accurate burst signal;
and the timing synchronization module is used for carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal.
In a second aspect of the embodiment of the present invention, the performing power triggering on the air interface signal data information to obtain an effective burst signal includes:
s21, sampling the air interface signal data information to obtain sampling data information;
s22, filtering the sampled data information to obtain a baseband IQ signal;
s23, performing power calculation on the baseband IQ signal to obtain an effective burst signal.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the baseband IQ signal x (n) is:
x(n)＝I(n)+jQ(n)
in the formula, N is the count of baseband IQ sampling points, the data information symbol length of the air interface signal is N, the signal sampling multiplying power is M, and the number of the sampling points of a complete baseband IQ signal x (N) is N multiplied by M.
In a second aspect of the embodiment of the present invention, the performing power calculation on the baseband IQ signal to obtain an effective burst signal includes:
s231, performing power calculation on any one sampling point of the baseband IQ signal to obtain any one sampling point power value;
s232, comparing the power value of any sampling point with a preset power trigger threshold value to obtain power trigger information of the sampling point;
the power trigger information is:
when P (n) is more than or equal to P and P (n-1) is less than P, the power triggering of the sampling point is successful, the power triggering information is 1, otherwise, the triggering is failed, the power triggering information is 0, P (n) is the power value of the nth sampling point, P (n-1) is the power value of the nth-1 sampling point, and P is a preset power triggering threshold value;
s233, recording the power trigger information of each sampling point of the baseband IQ signal to obtain an effective burst signal.
In a second aspect of the embodiment of the present invention, the performing power sampling on the effective burst signal to obtain an accurate burst signal includes:
s31, taking the 1 st sampling point with the power triggering information of the effective burst signal being 1 as the start, intercepting N multiplied by M sampling points to obtain a truncated burst signal;
s32, sampling the truncated burst signal by taking L as an interval to obtain a resampled burst signal, wherein the resampled burst signal comprises (N multiplied by M)/L sampling points, L is a positive integer, N is the data information symbol length of the air interface signal, and M is the signal sampling multiplying power;
s33, calculating the power values of all sampling points of the resampled burst signal, judging whether the power values of all sampling points are larger than a power trigger threshold value P, and if so, sampling and detecting successfully, wherein the effective burst signal is an accurate burst signal.
In a second aspect of the embodiment of the present invention, the performing burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal includes:
s41, performing sliding correlation processing on the accurate burst signal to obtain a sliding correlation signal;
and S42, detecting the maximum value of the sliding related signal to obtain timing synchronization information.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the sliding related signal is:
in the formula, corr n For sliding the correlation signal x 1 [n]To signal accurately the process, x uw (N) is a locally pre-stored unique word, M is a signal sampling rate, i=1, 2, …, (N) uw ×M)，N uw Is the length of the unique word.
In a second aspect of the embodiment of the present invention, the detecting the maximum value of the sliding correlation signal to obtain timing synchronization information of the burst signal includes:
s421, performing maximum detection on the sliding correlation signal by using a sliding correlation signal detection model to obtain timing synchronization optimal time information;
the sliding related signal detection model is as follows:
in the method, in the process of the invention,corr for timing synchronization of optimal time information n For the sliding-related signals, n=1 to (n×m-N) uw ×M)，
S422, sampling point position extraction is carried out on the timing synchronization optimal time information, and timing synchronization information of the burst signal is obtained.
The third aspect of the present invention discloses another timing synchronization device for burst signal testing, the device comprising:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to execute part or all of the steps in the timing synchronization method for burst signal testing disclosed in the first aspect of the embodiment of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the invention provides a timing synchronization method and a timing synchronization device for burst signal testing, which comprise three functional modules, namely burst signal power triggering, power sampling and burst synchronization, wherein the power triggering is realized based on the rising edge of the burst signal power, and the power sampling is designed to avoid possible power false triggering. After the burst signal is detected, a section of sampling data containing the effective signal is intercepted, and the correlation of signal unique words is utilized to carry out sliding correlation, so that the accurate starting position of the burst signal is obtained, and the timing synchronization is completed. Compared with a general direct sliding correlation method, the method has lower detection time delay, the calculation complexity of power detection and power sampling processing in the burst signal detection stage is lower than that of sliding correlation operation, and sliding correlation is carried out after burst signal detection is finished, so that the timing accuracy can be ensured, long-time correlation operation is avoided, and the synchronization time is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a timing synchronization method for burst signal testing according to an embodiment of the present invention;
FIG. 2 is a flow chart of another timing synchronization method for burst signal testing according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a burst profile of a transmission signal according to an embodiment of the present invention;
FIG. 4 is a simulation diagram of the power of a transmitted signal disclosed in an embodiment of the present invention;
FIG. 5 is a simulation diagram of burst timing synchronization correlation peaks disclosed in an embodiment of the present invention;
fig. 6 is a burst signal constellation diagram according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a timing synchronization device for burst signal testing according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another timing synchronization device for burst signal testing according to an embodiment of the present invention.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps or elements is not limited to the list of steps or elements but may, in the alternative, include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses a timing synchronization method and a device for burst signal test, wherein the method comprises the following steps: acquiring data information of an air interface signal; performing power triggering on the air interface signal data information to obtain an effective burst signal; performing power sampling on the effective burst signal to obtain an accurate burst signal; and carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal. The method can reduce the processing time of timing synchronization, effectively reduce the operation complexity of the burst capturing stage and reduce the timing synchronization delay. The following will describe in detail.
Example 1
Referring to fig. 1, fig. 1 is a flowchart of a timing synchronization method for burst signal testing according to an embodiment of the present invention. The timing synchronization method for burst signal test described in fig. 1 is applied to the technical field of digital signal processing, and is used for performing timing synchronization on measurement data in burst signal test, and embodiments of the present invention are not limited. As shown in fig. 1, the method for detecting the signal frequency band of the unmanned aerial vehicle may include the following operations:
s1, acquiring data information of an air interface signal;
s2, performing power triggering on the air interface signal data information to obtain an effective burst signal;
s3, performing power sampling on the effective burst signal to obtain an accurate burst signal;
s4, carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal.
Optionally, the performing power triggering on the air interface signal data information to obtain an effective burst signal includes:
s21, sampling the air interface signal data information to obtain sampling data information;
s22, filtering the sampled data information to obtain a baseband IQ signal;
the baseband IQ signals are I-channel and Q-channel signals, which are common representation methods in the art.
S23, performing power calculation on the baseband IQ signal to obtain an effective burst signal.
Optionally, the baseband IQ signal x (n) is:
x(n)＝I(n)+jQ(n)
in the formula, N is the count of baseband IQ sampling points, the data information symbol length of the air interface signal is N, the signal sampling multiplying power is M, and the number of the sampling points of a complete baseband IQ signal x (N) is N multiplied by M.
Optionally, the performing power calculation on the baseband IQ signal to obtain an effective burst signal includes:
s231, performing power calculation on any one sampling point of the baseband IQ signal to obtain any one sampling point power value;
s232, comparing the power value of any sampling point with a preset power trigger threshold value to obtain power trigger information of the sampling point;
the power trigger information is:
when P (n) is more than or equal to P and P (n-1) is less than P, the power triggering of the sampling point is successful, the power triggering information is 1, otherwise, the triggering is failed, the power triggering information is 0, P (n) is the power value of the nth sampling point, P (n-1) is the power value of the nth-1 sampling point, and P is a preset power triggering threshold value;
s233, recording the power trigger information of each sampling point of the baseband IQ signal to obtain an effective burst signal.
Optionally, the performing power sampling on the effective burst signal to obtain an accurate burst signal includes:
s31, taking the 1 st sampling point with the power triggering information of the effective burst signal being 1 as the start, intercepting N multiplied by M sampling points to obtain a truncated burst signal;
s32, sampling the truncated burst signal by taking L as an interval to obtain a resampled burst signal, wherein the resampled burst signal comprises (N multiplied by M)/L sampling points, L is a positive integer, N is the data information symbol length of the air interface signal, and M is the signal sampling multiplying power;
s33, calculating the power values of all sampling points of the resampled burst signal, judging whether the power values of all sampling points are larger than a power trigger threshold value P, and if so, sampling and detecting successfully, wherein the effective burst signal is an accurate burst signal.
Optionally, the performing burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal includes:
s41, performing sliding correlation processing on the accurate burst signal to obtain a sliding correlation signal;
and S42, detecting the maximum value of the sliding related signal to obtain timing synchronization information.
Optionally, the sliding related signal is:
in the formula, corr n For sliding the correlation signal x 1 [n]To signal accurately the process, x uw (N) is a locally pre-stored unique word, M is a signal sampling rate, i=1, 2, …, (N) uw ×M)，N uw Is the length of the unique word.
Optionally, the performing maximum detection on the sliding related signal to obtain timing synchronization information of the burst signal includes:
s421, performing maximum detection on the sliding correlation signal by using a sliding correlation signal detection model to obtain timing synchronization optimal time information;
the sliding related signal detection model is as follows:
in the method, in the process of the invention,corr for timing synchronization of optimal time information n For the sliding-related signals, n=1 to (n×m-N) uw ×M)，
S422, sampling point position extraction is carried out on the timing synchronization optimal time information, and timing synchronization information of the burst signal is obtained.
Compared with a general direct sliding correlation method, the method has lower detection time delay, the calculation complexity of power detection and power sampling processing in the burst signal detection stage is lower than that of sliding correlation operation, sliding correlation is carried out after burst signal detection is finished, timing accuracy can be ensured, long-time correlation operation is avoided, and therefore synchronization time is effectively reduced.
Example two
Referring to fig. 2, fig. 2 is a flowchart illustrating another timing synchronization method for burst signal testing according to an embodiment of the present invention. The timing synchronization method for burst signal test described in fig. 2 is applied to the technical field of digital signal processing, and is used for performing timing synchronization on measurement data in burst signal test, and embodiments of the present invention are not limited.
As shown in fig. 2, the timing synchronization of the present embodiment is divided into three steps including power triggering, power sampling and burst synchronization. The power trigger roughly determines the approximate arrival time of the burst signal, and intercepts the effective burst from the air interface signal of the mixed noise; the power sampling is to avoid false triggering caused by lower triggering threshold or larger instantaneous noise sampling point power, and according to the frame length of effective burst, the data after the power triggering is sampled to judge whether false triggering is performed; burst synchronization is performed after power triggering and power sampling are completed, a correlation peak value is determined after sliding correlation mainly by utilizing known unique word correlation in burst signals, and the accurate timing synchronization position of an effective burst is determined according to the position of the correlation peak value.
1. Power triggering
The test signal is a baseband IQ signal when reaching the timing synchronization module after being sampled and low-pass filtered, and the complex baseband signal expression is as follows:
x(n)＝I(n)+jQ(n)
where n is the count of baseband IQ samples. Assuming that the burst signal symbol length is N and the signal sampling rate is M, the number of sampling points of a complete burst signal is n×m, I (N) is an I channel signal, and Q (N) is a Q channel signal.
Power is calculated for each sample point x (n):
P(n)＝I(n)×I(n)+Q(n)×Q(n)
setting a power trigger threshold P, when P (n) is more than or equal to P and P (n-1) is less than P, considering that the power trigger is successful, otherwise, the trigger is failed, and continuing to trigger n+1 sampling points, and so on.
2. Power sampling
The power sampling is to circumvent false triggers caused by high power or other clutter in the background noise signal transients. After the power trigger is successful, starting with the 1 st sampling point meeting the trigger power threshold, sampling the sampling points with the length of N.times.M sampling points with the length of L as intervals, and adding up N.times.M/L sampling points. Calculating the power values of all sampling points, judging whether the power values of all the sampling points are larger than a power trigger threshold value P, and if the power values are satisfied, sampling detection is successful; otherwise repeating the power triggering step.
3. Burst synchronization
And (3) performing sliding correlation on N.times.M sampling points sampled by power by utilizing a locally pre-stored unique word, and determining the accurate position of the burst signal by a correlation peak so as to complete timing synchronization, wherein the deduction is as follows:
designing a sliding window with the length N of the unique word of the burst signal uw The length of the sampling point is recorded as N uw X M. Record x uw (n) is a locally pre-stored unique word, and the sliding correlation expression is:
wherein, the value range of N is n=1 to (N multiplied by M-N) uw ×M)。
The optimal timing synchronization moment can be estimated by using the maximum point of the cross correlation, and the expression is as follows:
the sampling point position corresponding to the n value in the formula is the synchronous position of the unique word, and the initial position of the burst can be calculated according to the relative position of the unique word in the whole burst, so that the timing synchronization of the burst signal is completed.
In this embodiment, it is assumed that the symbol rate of a transmitter of a certain communication system is 16ksym/s, QPSK modulation is adopted, the duration of each burst is 200 symbols, the number of unique symbols is 40, the number of randomly generated data symbols is 150, the number of guard symbols before and after the burst is 5, and the number of guard symbols before and after the burst is formed by a root raised cosine roll-off filter, where the roll-off coefficient a=0.35, and the time length of a single burst is 12.5ms. The transmitter transmits the burst signal with a 50% duty cycle, i.e. the burst signal alternates with noise with a 12.5ms period, wherein the burst signal has an average power of about 10dBm and a noise power of-50 dBm. The test meter receiver samples the signal at a 4 times sampling rate, which is 64kHz. Simulation results of each stage are described below:
according to the simulation conditions, the distribution of the 125ms signal burst generated by the transmitter is schematically shown in fig. 3, the power trace of the simulation signal is shown in fig. 4, and the subsequent timing synchronization needs to extract 5 burst signals in 125 ms.
The test instrument receiver sets the trigger power to-10 dBm, and according to the scheme, the sampling point positions meeting the trigger conditions and the sampling point positions of the initial start of each burst signal are shown in table 1.
TABLE 1 sampling point positions
As can be seen from the data in table 1, the power trigger can more accurately locate the burst signal from the transmission signal.
After the power triggering is completed, starting from the position of the sampling point where the power triggering of each burst signal is successful, and intercepting out 5 burst signals with the burst length of 800sym as the burst length. Each burst signal was sampled at 80 sampling points intervals and power was calculated, the sampled power being the average power of the adjacent 4 sampling points, and the power record was as shown in table 2.
Table 2 power recording
The sampling point power of the 5 burst signals is larger than the trigger power, and it can be determined that the 5 burst signals are not triggered by mistake.
And respectively carrying out sliding correlation on the 5 burst signals by utilizing the unique word parts of the burst signals, determining the timing synchronization position of each symbol, wherein correlation peaks after sliding correlation are shown in fig. 5, and burst signal constellation diagrams after timing synchronization are shown in fig. 6. According to this scheme, the unique word start position determined by the correlation peak and the burst start position determined according to this are recorded as in table 3, and the actual signal start position of each burst is recorded.
TABLE 3 burst signal start position
Compared with a general direct sliding correlation method, the method has lower detection time delay, the calculation complexity of power detection and power sampling processing in the burst signal detection stage is lower than that of sliding correlation operation, sliding correlation is carried out after burst signal detection is finished, timing accuracy can be ensured, long-time correlation operation is avoided, and therefore synchronization time is effectively reduced.
Example III
Referring to fig. 7, fig. 7 is a schematic structural diagram of a timing synchronization device for burst signal testing according to an embodiment of the present invention. The timing synchronization device for burst signal test described in fig. 7 is applied to the technical field of digital signal processing, and is used for performing timing synchronization on measurement data in burst signal test, and embodiments of the present invention are not limited. As shown in fig. 7, the unmanned aerial vehicle signal frequency band detection device may include the following operations:
s301, a signal acquisition module is used for acquiring data information of an air interface signal;
s302, a power triggering module is used for performing power triggering on the air interface signal data information to obtain an effective burst signal;
s303, a power sampling module, which is used for performing power sampling on the effective burst signal to obtain an accurate burst signal;
s304, a timing synchronization module is used for carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal.
Example IV
Referring to fig. 8, fig. 8 is a schematic structural diagram of another timing synchronization device for burst signal testing according to an embodiment of the present invention. The timing synchronization device for burst signal test described in fig. 8 is applied to the technical field of digital signal processing, and is used for performing timing synchronization on measurement data in burst signal test, and embodiments of the present invention are not limited. As shown in fig. 8, the unmanned aerial vehicle signal frequency band detection device may include the following operations: a memory 401 storing executable program codes;
a processor 402 coupled with the memory 401;
the processor 402 invokes executable program codes stored in the memory 401 for performing the steps in the timing synchronization method for burst signal testing described in the first and second embodiments.
The apparatus embodiments described above are merely illustrative, in which the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the embodiment of the invention discloses a timing synchronization method and a timing synchronization device for burst signal test, which are disclosed by the embodiment of the invention and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A timing synchronization method for burst signal testing, the method comprising:
s1, acquiring data information of an air interface signal;
s2, performing power triggering on the air interface signal data information to obtain an effective burst signal;
s3, performing power sampling on the effective burst signal to obtain an accurate burst signal;
s4, carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal.
2. The method for timing synchronization of burst signal testing according to claim 1, wherein said performing power triggering on said air interface signal data information to obtain an effective burst signal comprises:
s21, sampling the air interface signal data information to obtain sampling data information;
s22, filtering the sampled data information to obtain a baseband IQ signal;
s23, performing power calculation on the baseband IQ signal to obtain an effective burst signal.
3. The timing synchronization method of burst signal testing according to claim 2, wherein the baseband IQ signal x (n) is:
x(n)＝I(n)+jQ(n)
in the formula, N is the count of baseband IQ sampling points, the data information symbol length of the air interface signal is N, the signal sampling multiplying power is M, and the number of the sampling points of a complete baseband IQ signal x (N) is N multiplied by M.
4. The method for timing synchronization of burst signal testing according to claim 2, wherein said performing power calculation on the baseband IQ signal to obtain an effective burst signal comprises:
s231, performing power calculation on any one sampling point of the baseband IQ signal to obtain any one sampling point power value;
s232, comparing the power value of any sampling point with a preset power trigger threshold value to obtain power trigger information of the sampling point;
the power trigger information is:
when P (n) is more than or equal to P and P (n-1) is less than P, the power triggering of the sampling point is successful, the power triggering information is 1, otherwise, the triggering is failed, the power triggering information is 0, P (n) is the power value of the nth sampling point, P (n-1) is the power value of the nth-1 sampling point, and P is a preset power triggering threshold value;
s233, recording the power trigger information of each sampling point of the baseband IQ signal to obtain an effective burst signal.
5. The method for timing synchronization of burst signal testing according to claim 1, wherein said performing power sampling on said effective burst signal to obtain an accurate burst signal comprises:
s31, taking the 1 st sampling point with the power triggering information of the effective burst signal being 1 as the start, intercepting N multiplied by M sampling points to obtain a truncated burst signal;
s32, sampling the truncated burst signal by taking L as an interval to obtain a resampled burst signal, wherein the resampled burst signal comprises (N multiplied by M)/L sampling points, L is a positive integer, N is the data information symbol length of the air interface signal, and M is the signal sampling multiplying power;
s33, calculating the power values of all sampling points of the resampled burst signal, judging whether the power values of all sampling points are larger than a power trigger threshold value P, and if so, sampling and detecting successfully, wherein the effective burst signal is an accurate burst signal.
6. The method for timing synchronization of burst signal testing according to claim 1, wherein said performing burst synchronization processing on said accurate burst signal to obtain timing synchronization information of the burst signal comprises:
s41, performing sliding correlation processing on the accurate burst signal to obtain a sliding correlation signal;
and S42, detecting the maximum value of the sliding related signal to obtain timing synchronization information.
7. The method for timing synchronization of burst signal testing according to claim 6, wherein the sliding-related signal is:
in the formula, corr n For sliding the correlation signal x 1 [n]To signal accurately the process, x uw (N) is a locally pre-stored unique word, M is a signal sampling rate, i=1, 2, …, (N) uw ×M)，N uw Is the length of the unique word.
8. The method for timing synchronization of burst signal testing according to claim 6, wherein said performing maximum detection on said sliding-related signal to obtain timing synchronization information of burst signal includes:
s421, performing maximum detection on the sliding correlation signal by using a sliding correlation signal detection model to obtain timing synchronization optimal time information;
the sliding related signal detection model is as follows:
in the method, in the process of the invention,corr for timing synchronization of optimal time information n For the sliding-related signals, n=1 to (n×m-N) uw ×M)，
S422, sampling point position extraction is carried out on the timing synchronization optimal time information, and timing synchronization information of the burst signal is obtained.
9. A timing synchronization apparatus for burst signal testing, the apparatus comprising:
the signal acquisition module is used for acquiring data information of the air interface signal;
the power triggering module is used for performing power triggering on the air interface signal data information to obtain an effective burst signal;
the power sampling module is used for performing power sampling on the effective burst signal to obtain an accurate burst signal;
and the timing synchronization module is used for carrying out burst synchronization processing on the accurate burst signal to obtain timing synchronization information of the burst signal.
10. A timing synchronization apparatus for burst signal testing, the apparatus comprising:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform the timing synchronization method of burst signal testing as claimed in any one of claims 1-8.
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