CN115580317B - Ultra-wideband synchronization capture method and device - Google Patents

Ultra-wideband synchronization capture method and device Download PDF

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Publication number
CN115580317B
CN115580317B CN202211577692.7A CN202211577692A CN115580317B CN 115580317 B CN115580317 B CN 115580317B CN 202211577692 A CN202211577692 A CN 202211577692A CN 115580317 B CN115580317 B CN 115580317B
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local
correlation
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local correlation
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CN115580317A (en
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马冲
文敏
梁俊萍
王子杰
赵江涛
沈志飞
杨勇
曹永祯
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Changsha Chixin Semiconductor Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/7077—Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/7163—Spread spectrum techniques using impulse radio
    • H04B1/7183—Synchronisation
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract

The invention provides a synchronous capturing method and a device for ultra wide band, comprising the following steps: performing direct spread spectrum sequence matching filtering on the lead code data to obtain despread lead code target data; taking the guided code target data of the current symbol period as a local noise template signal, and respectively performing correlation operation with a first delay target signal, a second delay target signal and a third delay target signal to obtain local correlation signals with three groups of symbol lengths; after the three groups of local correlation signals are filtered and denoised, performing correlation operation again to obtain a first output signal and a second output signal; summing the first output signal and the second output signal to obtain a signal energy value of the cross-correlation sum, and comparing and searching the chip position of the peak energy according to the signal energy value; and determining a noise average energy threshold, and when the peak energy is greater than or equal to the noise average energy threshold, determining the chip position as a coarse synchronization position. The ultra-wideband synchronization acquisition method and device provided by the invention have higher acquisition probability and smaller acquisition error.

Description

Synchronous capturing method and device for ultra-wideband
Technical Field
The present invention relates to the field of ultra-wideband technologies, and in particular, to a method and an apparatus for ultra-wideband synchronization acquisition.
Background
The pulse Ultra-Wideband (IR-UWB) is a wireless communication technology which adopts Ultra-short pulse with extremely low power spectral density as an information carrier, can share frequency spectrum resources with other communication systems, is applied to an unlicensed frequency band between 3.1 to 10.6GHz and limits the transmitting power to be below-41.3 dBm/MHz. The method has the advantages of good concealment, high transmission rate, low power consumption, high positioning accuracy, strong multipath resistance, strong penetrating power, good safety and the like. The ultra-wideband technology is originally used in the field of military radar, and is officially approved to be used in the field of civil communication by the Federal Communications Commission (FCC for short) in 2 months in 2002, so that the ultra-wideband technology is gradually applied to various fields requiring high-precision ranging and positioning.
The ultra-wideband transmission power is extremely low, signals are easily submerged in noise, the bandwidth of an ultra-wideband channel is extremely wide and far larger than the coherent bandwidth of a wireless channel, so that the frequency selective fading is serious, the multipath effect is obvious, and the originally weak signals are more difficult to detect. Therefore, how to design a synchronization algorithm, reduce the synchronization acquisition time and improve the synchronization acquisition probability is particularly important for an ultra-wideband receiver system.
The existing synchronous capture method comprises coherent and non-coherent receiving, an ultra-wideband system is more suitable for coherent receiving method, high synchronization precision can ensure demodulation performance and effectively reduce error code probability, but the existing algorithm can not meet the performance requirement of a receiver, thereby becoming the design bottleneck of the whole system.
Therefore, it is necessary to provide a synchronization acquisition method and apparatus for ultra-wideband, so as to effectively solve the above problems.
Disclosure of Invention
The invention provides a synchronous capturing method and a synchronous capturing device for ultra-wideband, which have higher capturing probability and smaller capturing error.
The embodiment of the invention provides a synchronous acquisition method for an ultra-wideband, which comprises the following steps:
performing direct spread spectrum sequence matching filtering on the lead code data to obtain despread lead code target data;
taking the lead code target data of the current symbol period as a local noise template signal, and performing correlation operation on the local noise template signal and a first delay target signal, a second delay target signal and a third delay target signal respectively to obtain a first local correlation signal, a second local correlation signal and a third local correlation signal with three groups of symbol lengths;
after the first, second and third local correlation signals are filtered and denoised, performing correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and performing correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal;
summing the first output signal and the second output signal to obtain a signal energy value of the cross-correlation sum, and comparing and searching the chip position where the peak energy is located according to the signal energy value;
and determining a noise average energy threshold, wherein when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position.
Preferably, the first delayed target signal is a delayed target signal delayed by Tdsym, the second delayed target signal is a delayed target signal delayed by 2Tdsym, and the third delayed target signal is a delayed target signal delayed by 3Tdsym.
Preferably, the preamble data is specifically calculated by the following formula:
Figure 829986DEST_PATH_IMAGE001
wherein,
Figure 446912DEST_PATH_IMAGE002
indicating the data of the leading code,
Figure 471500DEST_PATH_IMAGE003
which represents a convolution operation, is a function of,
Figure 882890DEST_PATH_IMAGE004
which is indicative of a signal to be transmitted,
Figure 258508DEST_PATH_IMAGE005
representing the impulse response function of the multipath channel,
Figure 115343DEST_PATH_IMAGE006
is additive white gaussian noise.
Preferably, the despread preamble target data is specifically calculated by the following formula:
Figure 56754DEST_PATH_IMAGE007
wherein,
Figure 842307DEST_PATH_IMAGE008
represents the despread preamble target data,
Figure 501959DEST_PATH_IMAGE009
which represents the length of the pseudo-random sequence,
Figure 663950DEST_PATH_IMAGE010
which represents the pulse repetition period, is shown,
Figure 161665DEST_PATH_IMAGE011
which represents the minimum width of a chip,
Figure 914858DEST_PATH_IMAGE012
indicating the number of chips in one symbol of the preamble data,
Figure 796226DEST_PATH_IMAGE013
indicating that user k repeats the interpolated pseudo-random sequence.
Preferably, the preamble target data of the current symbol period is used as a local noise template signal, and the local noise template signal is respectively correlated with the first, second, and third delay target signals, so as to obtain the first, second, and third local correlation signals with three groups of symbol lengths, which is specifically calculated by the following formula:
Figure 965170DEST_PATH_IMAGE014
Figure 881174DEST_PATH_IMAGE015
Figure 501205DEST_PATH_IMAGE016
wherein,
Figure 135449DEST_PATH_IMAGE017
which is representative of the first local correlation signal,
Figure 170401DEST_PATH_IMAGE018
which is representative of the second local correlation signal,
Figure 878594DEST_PATH_IMAGE019
representing a third local correlation signal.
Preferably, the filtering and denoising of the first, second, and third local correlation signals is specifically calculated by the following formula:
Figure 239168DEST_PATH_IMAGE020
Figure 829550DEST_PATH_IMAGE021
Figure 369990DEST_PATH_IMAGE022
wherein,
Figure 260586DEST_PATH_IMAGE023
is representative of the current filtered signal and,
Figure 729744DEST_PATH_IMAGE024
in order to delay the length of the feedback signal,
Figure 73001DEST_PATH_IMAGE025
three different amounts of delay are indicated and,
Figure 449756DEST_PATH_IMAGE026
is a function of the feed-forward coefficient,
Figure 398120DEST_PATH_IMAGE027
is a feedback coefficient.
Preferably, the signal energy value of the sum of cross-correlations obtained by summing said first output signal and said second output signal is calculated by the following formula:
Figure 536715DEST_PATH_IMAGE028
Figure 367268DEST_PATH_IMAGE029
wherein,
Figure 16555DEST_PATH_IMAGE030
an energy signal value representing the sum of the cross-correlations,
Figure 288268DEST_PATH_IMAGE031
is composed of
Figure 660081DEST_PATH_IMAGE032
The complex number of (c) is conjugated.
Preferably, the noise mean energy threshold is determined by the energy of the peak energy window interval and the total energy in the symbol.
Preferably, the noise average energy threshold is specifically calculated by the following formula:
Figure 915613DEST_PATH_IMAGE033
Figure 103012DEST_PATH_IMAGE034
Figure 822706DEST_PATH_IMAGE035
wherein,
Figure 601306DEST_PATH_IMAGE036
represents the energy of the peak energy window interval,
Figure 582949DEST_PATH_IMAGE037
indicating the location of the energy of the search peak,
Figure 370777DEST_PATH_IMAGE038
representing the length of the interval of the peak energy window,
Figure 882661DEST_PATH_IMAGE039
representing the total energy within the symbol,
Figure 97741DEST_PATH_IMAGE040
representing the noise mean energy threshold.
The embodiment of the invention also provides a synchronous capturing device for the ultra-wideband, which comprises:
the target data acquisition module is used for performing direct spread spectrum sequence matching filtering on the lead code data to obtain despread lead code target data;
a first correlation operation module, configured to use the preamble target data of a current symbol period as a local noise template signal, and perform correlation operations on the local noise template signal and first, second, and third delayed target signals, respectively, to obtain first, second, and third local correlation signals with three groups of symbol lengths;
a second correlation operation module, configured to perform filtering and denoising on the first, second, and third local correlation signals, perform a correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and perform a correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal;
a signal energy value obtaining module, configured to sum the first output signal and the second output signal to obtain a signal energy value of a cross-correlation sum, and compare and search a chip position where a peak energy is located according to the signal energy value;
and the coarse synchronization position acquisition module is used for determining a noise average energy threshold, and when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the method and the device for synchronously capturing the ultra-wideband provided by the embodiment of the invention take the lead code target data of the current symbol period as a local noise template signal, and perform related operation on the local noise template signal and a first delay target signal, a second delay target signal and a third delay target signal respectively to obtain a first local related signal, a second local related signal and a third local related signal with three groups of symbol lengths; after the first, second and third local correlation signals are filtered and denoised, performing correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and performing correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal; summing the first output signal and the second output signal to obtain a signal energy value of the cross-correlation sum, and comparing and searching the chip position of peak energy according to the signal energy value; and determining a noise average energy threshold, wherein when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position, so that the acquisition probability is higher, the acquisition error is smaller, and the acquisition sensitivity is improved by 3dB.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for describing the embodiments or the prior art, and it is apparent that the drawings in the following description are some embodiments of the present invention, but not all embodiments. For a person skilled in the art, other figures can also be obtained from these figures without inventive exercise.
Fig. 1 is a schematic flow chart of a synchronization acquisition method for ultra-wideband according to an embodiment of the present invention;
fig. 2 is a block diagram of a synchronization acquisition device for ultra-wideband according to an embodiment of the present invention;
fig. 3 is a schematic circuit implementation flow diagram of a synchronization acquisition apparatus for ultra-wideband according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The technical solution of the present invention will be described in detail with reference to specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Based on the problems in the prior art, embodiments of the present invention provide a method and an apparatus for ultra-wideband synchronization acquisition, which have a higher acquisition probability and a smaller acquisition error.
It should be noted that the following "correlation operation", "correlation signal" and the following "correlation" are terms used in the communication field, and the "correlation operation" is generally understood as a mathematical operation for comparing similarity between two sequences.
Fig. 1 is a schematic flow chart of a synchronization acquisition method for ultra-wideband according to an embodiment of the present invention, where the method includes:
step S101: performing direct spread spectrum sequence matching filtering on the lead code data to obtain despread lead code target data;
step S102: taking the lead code target data of the current symbol period as local noise template signals, and performing correlation operation on the local noise template signals and first, second and third delay target signals respectively to obtain first, second and third local correlation signals with three groups of symbol lengths;
step S103: after the first local correlation signal, the second local correlation signal and the third local correlation signal are filtered and denoised, performing correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and performing correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal;
step S104: summing the first output signal and the second output signal to obtain a signal energy value of the cross-correlation sum, and comparing and searching the chip position where the peak energy is located according to the signal energy value;
step S105: and determining a noise average energy threshold, wherein when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position.
In a specific implementation, the first delay target signal is a delay target signal delayed by Tdsym, tdsym represents a delay signal of 1 symbol period, the second delay target signal is a delay target signal delayed by 2Tdsym, 2Tdsym represents a delay signal of 2 symbol periods, the third delay target signal is a delay target signal delayed by 3Tdsym, and 3Tdsym represents a delay signal of 3 symbol periods.
In a specific implementation, for an ultra-wideband pulse signal, where a second-order monocycle gaussian pulse is used as a basic pulse waveform for carrying information, the formula is expressed as follows:
Figure 327866DEST_PATH_IMAGE041
wherein,
Figure 388226DEST_PATH_IMAGE042
is a pulse-forming factor, and is,
Figure 581047DEST_PATH_IMAGE043
determines the pulse width. The ultra-wideband preamble modulation mode adopts direct sequence spread spectrum modulation, each user has a unique pseudo-random sequence, and if the user is k, a transmission signal can be represented as:
Figure 904712DEST_PATH_IMAGE044
wherein,
Figure 418870DEST_PATH_IMAGE045
indicating that the amplitude of the preamble signal is being transmitted,
Figure 282921DEST_PATH_IMAGE046
for a pseudo-random sequence of user k, the pulse repetition period is
Figure 769397DEST_PATH_IMAGE047
The symbol transmission period is
Figure 60701DEST_PATH_IMAGE048
The length of the pseudo-random sequence is
Figure 763953DEST_PATH_IMAGE049
The impulse response function of the multipath channel is:
Figure 431695DEST_PATH_IMAGE050
wherein,
Figure 834994DEST_PATH_IMAGE051
is shown as
Figure 766041DEST_PATH_IMAGE051
The root of the multi-path,
Figure 192474DEST_PATH_IMAGE052
in order to be the total number of multi-paths,
Figure 428021DEST_PATH_IMAGE053
is shown as
Figure 420248DEST_PATH_IMAGE051
Amplitude attenuation coefficient of root multipath, let us assume
Figure 256617DEST_PATH_IMAGE054
For the minimum chip width, when the transmitted signal waveform reaches the receiving end through a multipath channel, the preamble data is specifically calculated by the following formula:
Figure 232663DEST_PATH_IMAGE055
wherein,
Figure 242208DEST_PATH_IMAGE002
indicating the data of the preamble code,
Figure 292203DEST_PATH_IMAGE003
which represents a convolution operation, the operation of the convolution,
Figure 143483DEST_PATH_IMAGE004
it is indicated that the signal is transmitted,
Figure 75667DEST_PATH_IMAGE005
representing the impulse response function of the multi-path channel,
Figure 92164DEST_PATH_IMAGE006
is additive white gaussian noise.
In a specific implementation, if the pseudo-random sequence of the transmitting user is known, matched filtering may be performed on the received preamble signal, and the despread preamble target data is specifically calculated by the following formula:
Figure 58983DEST_PATH_IMAGE007
wherein,
Figure 768313DEST_PATH_IMAGE008
represents the despread preamble target data,
Figure 889591DEST_PATH_IMAGE009
which represents the length of the pseudo-random sequence,
Figure 240938DEST_PATH_IMAGE010
which represents the period of repetition of the pulses,
Figure 531105DEST_PATH_IMAGE011
which represents the minimum width of a chip,
Figure 880178DEST_PATH_IMAGE012
indicating the number of chips in one symbol of the preamble data,
Figure 754330DEST_PATH_IMAGE013
indicating that user k repeats the interpolated pseudo-random sequence. The autocorrelation of the pseudo-random sequence is used to make the signal energy more concentrated at the synchronization time.
In an implementation, the target function is selected from
Figure 909368DEST_PATH_IMAGE056
Taking the signal in the current symbol period as the local noise template signal, taking the lead code target data in the current symbol period as the local noise template signal, and taking the local noise template signalThe template signal is respectively correlated with the first delay target signal, the second delay target signal and the third delay target signal, and the first local correlation signal, the second local correlation signal and the third local correlation signal with the three groups of symbol lengths are obtained by specifically calculating according to the following formulas:
Figure 850779DEST_PATH_IMAGE014
Figure 636333DEST_PATH_IMAGE015
Figure 30405DEST_PATH_IMAGE016
wherein,
Figure 989134DEST_PATH_IMAGE017
which is representative of the first local correlation signal,
Figure 486849DEST_PATH_IMAGE018
which is representative of a second local correlation signal,
Figure 240041DEST_PATH_IMAGE019
representing a third local correlation signal.
In a specific implementation, in order to further eliminate the noise influence, filtering and denoising the first, second, and third local correlation signals are specifically calculated by the following formula:
Figure 324672DEST_PATH_IMAGE020
Figure 821512DEST_PATH_IMAGE021
Figure 737516DEST_PATH_IMAGE022
wherein,
Figure 661610DEST_PATH_IMAGE023
is representative of the current filtered signal and,
Figure 472352DEST_PATH_IMAGE024
to delay
Figure 772883DEST_PATH_IMAGE057
A feedback signal of a length of the signal,
Figure 543393DEST_PATH_IMAGE025
three different delay amounts are indicated and,
Figure 841650DEST_PATH_IMAGE026
in order to be a feed-forward coefficient,
Figure 697611DEST_PATH_IMAGE027
is a feedback coefficient. After multiple filtering, the noise energy will be continuously reduced to a certain range, further increasing the sensitivity of synchronous capture.
In a specific implementation, the signal energy value of the sum of the cross-correlations obtained by summing the first output signal and the second output signal is calculated by the following formula:
Figure 536254DEST_PATH_IMAGE028
Figure 863068DEST_PATH_IMAGE029
wherein,
Figure 394543DEST_PATH_IMAGE030
an energy signal value representing the sum of the cross-correlations,
Figure 675483DEST_PATH_IMAGE031
is composed of
Figure 52238DEST_PATH_IMAGE032
Is conjugated to the complex number of (c).
In a specific implementation, the noise mean energy threshold is determined by the energy of the peak energy window interval and the total energy in the symbol.
In a specific implementation, the noise average energy threshold is specifically calculated by the following formula:
Figure 797340DEST_PATH_IMAGE033
Figure 234137DEST_PATH_IMAGE034
Figure 500908DEST_PATH_IMAGE035
wherein,
Figure 946933DEST_PATH_IMAGE036
represents the energy of the peak energy window interval,
Figure 280962DEST_PATH_IMAGE037
indicating the location of the energy of the search peak,
Figure 91924DEST_PATH_IMAGE038
representing the length of the interval of the peak energy window,
Figure 144193DEST_PATH_IMAGE039
representing the total energy within the symbol,
Figure 393909DEST_PATH_IMAGE040
representing the noise mean energy threshold.
If it is not
Figure 284242DEST_PATH_IMAGE058
If the position is the synchronous capture successful position, otherwise, the above steps are repeated to continue searching until the judgment condition or the synchronous timeout time limit is met.
Fig. 2 is a schematic block diagram of a synchronization acquisition apparatus for ultra-wideband according to an embodiment of the present invention, the apparatus including:
a target data obtaining module 21, configured to perform direct spread spectrum sequence matching filtering on the preamble data to obtain despread preamble target data;
a first correlation operation module 22, configured to use the preamble target data of the current symbol period as a local noise template signal, and perform correlation operations on the local noise template signal and first, second, and third delay target signals, respectively, to obtain first, second, and third local correlation signals with three groups of symbol lengths;
a second correlation operation module 23, configured to perform filtering and denoising on the first, second, and third local correlation signals, perform a correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and perform a correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal;
a signal energy value obtaining module 24, configured to sum the first output signal and the second output signal to obtain a signal energy value of a cross-correlation sum, and compare and search a chip position where a peak energy is located according to the signal energy value;
a coarse synchronization position obtaining module 25, configured to determine a noise average energy threshold, where the chip position is a coarse synchronization position when the peak energy is greater than or equal to the noise average energy threshold.
Fig. 3 is a schematic circuit implementation flow diagram of a synchronous acquisition device for ultra-wideband according to an embodiment of the present invention, and as can be seen from fig. 3, the circuit of the synchronous acquisition device for ultra-wideband according to the embodiment performs correlation operations with a first delayed target signal, a second delayed target signal, and a third delayed target signal through three correlators, respectively, where the first delayed target signal is delayed by Tdsym, the second delayed target signal is delayed by 2Tdsym, and the third delayed target signal is delayed by 3Tdsym. And performing correlation operation on the first local correlation signal and the second local correlation signal through a correlator to obtain a first output signal, and performing correlation operation on the second local correlation signal and the third local correlation signal through the correlator to obtain a second output signal, wherein the left shift represents the power of 2 multiplied by the left shift. And summing the first output signal and the second output signal through an adder to obtain a signal energy value of the cross-correlation sum.
In summary, the method and the apparatus for ultra-wideband synchronization acquisition provided in the embodiment of the present invention use the preamble target data of a current symbol period as a local noise template signal, and perform correlation operations on the local noise template signal and first, second, and third delayed target signals, respectively, to obtain first, second, and third local correlation signals with three groups of symbol lengths; after the first local correlation signal, the second local correlation signal and the third local correlation signal are filtered and denoised, performing correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and performing correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal; summing the first output signal and the second output signal to obtain a signal energy value of the cross-correlation sum, and comparing and searching the chip position of peak energy according to the signal energy value; and determining a noise average energy threshold, wherein when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position, so that the acquisition probability is higher, the acquisition error is smaller, and the acquisition sensitivity is improved by 3dB.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A method for ultra-wideband synchronization acquisition, comprising:
performing direct spread spectrum sequence matching filtering on the lead code data to obtain despread lead code target data;
taking the lead code target data of the current symbol period as local noise template signals, and performing correlation operation on the local noise template signals and first, second and third delay target signals respectively to obtain first, second and third local correlation signals with three groups of symbol lengths;
after the first local correlation signal, the second local correlation signal and the third local correlation signal are filtered and denoised, performing correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and performing correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal;
summing the first output signal and the second output signal to obtain a signal energy value of the cross-correlation sum, and comparing and searching the chip position of peak energy according to the signal energy value;
and determining a noise average energy threshold, wherein when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position.
2. The method of claim 1, wherein the preamble data is specifically calculated by the following formula:
Figure QLYQS_1
，
wherein,
Figure QLYQS_2
indicating the data of the leading code,
Figure QLYQS_3
which represents a convolution operation, is a function of,
Figure QLYQS_4
which is indicative of a signal to be transmitted,
Figure QLYQS_5
representing the impulse response function of the multipath channel,
Figure QLYQS_6
is additive white gaussian noise.
3. The method of claim 2, wherein the despread preamble target data is calculated by the following formula:
Figure QLYQS_7
，
wherein,
Figure QLYQS_8
represents the despread preamble target data,
Figure QLYQS_9
which represents the length of the pseudo-random sequence,
Figure QLYQS_10
which represents the pulse repetition period, is shown,
Figure QLYQS_11
which represents the minimum width of a chip,
Figure QLYQS_12
indicating the number of chips in one symbol of the preamble data,
Figure QLYQS_13
representing user k repeated interpolated artifactsA random sequence.
4. The method of claim 3, wherein the preamble target data of a current symbol period is used as a local noise template signal, and the local noise template signal is correlated with a first delay target signal, a second delay target signal, and a third delay target signal, so as to obtain a first local correlation signal, a second local correlation signal, and a third local correlation signal with three symbol lengths, which are calculated according to the following formulas:
Figure QLYQS_14
，
Figure QLYQS_15
，
Figure QLYQS_16
，
wherein,
Figure QLYQS_17
which is representative of a first local correlation signal,
Figure QLYQS_18
which is representative of the second local correlation signal,
Figure QLYQS_19
representing a third local correlation signal.
5. The method of claim 4, wherein the filtering and de-noising of the first, second, and third local correlation signals is specifically calculated by the following equation:
Figure QLYQS_20
，
Figure QLYQS_21
，
Figure QLYQS_22
，
wherein,
Figure QLYQS_23
is representative of the current filtered signal and,
Figure QLYQS_24
in order to delay the length of the feedback signal,
Figure QLYQS_25
three different delay amounts are indicated and,
Figure QLYQS_26
in order to be a feed-forward coefficient,
Figure QLYQS_27
is a feedback coefficient.
6. The method of claim 5, wherein the signal energy value of the sum of cross-correlations obtained by summing the first output signal and the second output signal is calculated by the following formula:
Figure QLYQS_28
，
Figure QLYQS_29
，
wherein,
Figure QLYQS_30
an energy signal value representing the sum of the cross-correlations,
Figure QLYQS_31
is composed of
Figure QLYQS_32
The complex number of (c) is conjugated.
7. The method of claim 6, wherein the noise mean energy threshold is determined by a peak energy window interval energy and a total energy within a symbol.
8. A synchronization acquisition device for ultra-wideband, comprising:
the target data acquisition module is used for performing direct spread spectrum sequence matching filtering on the lead code data to obtain despread lead code target data;
a first correlation operation module, configured to use the preamble target data of a current symbol period as a local noise template signal, and perform correlation operations on the local noise template signal and first, second, and third delayed target signals, respectively, to obtain first, second, and third local correlation signals with three groups of symbol lengths;
a second correlation operation module, configured to perform filtering and denoising on the first, second, and third local correlation signals, perform a correlation operation on the first local correlation signal and the second local correlation signal to obtain a first output signal, and perform a correlation operation on the second local correlation signal and the third local correlation signal to obtain a second output signal;
a signal energy value obtaining module, configured to sum the first output signal and the second output signal to obtain a signal energy value of a cross-correlation sum, and compare and search a chip position where a peak energy is located according to the signal energy value;
and the coarse synchronization position acquisition module is used for determining a noise average energy threshold, and when the peak energy is greater than or equal to the noise average energy threshold, the chip position is a coarse synchronization position.
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