CN113965237B - Method for realizing edge self-synchronization of periodic intermittent signal - Google Patents
Method for realizing edge self-synchronization of periodic intermittent signal Download PDFInfo
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- 238000003708 edge detection Methods 0.000 claims description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
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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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- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a method for realizing edge self-synchronization of periodic intermittent signals, and belongs to the technical field of radio frequency antenna self-tracking. The invention comprises the processing steps of signal detection, edge self-synchronous detection, signal existence detection, output selection and the like, and realizes the tracking demodulation of periodic intermittent signals. The invention dynamically adjusts the signal duration and the signal loss period of the local synchronous signal based on negative feedback, realizes the local edge self-synchronization of signals such as TDMA signals, helicopter rotor wing shielding signals and the like, has the advantages of no need of priori knowledge such as synchronization heads and the like, high integration degree, low working signal to noise ratio, simple algorithm and the like, and can be used as a basis for realizing self-tracking by using intermittent signals in a satellite communication antenna.
Description
Technical Field
The invention relates to the technical field of antenna self-tracking, in particular to a method for realizing edge self-synchronization by periodic intermittent signals.
Background
In the current self-tracking field of satellite communication antennas, most tracking receivers in modes of single pulse, electron beam deflection, cone scanning, stepping and the like adopt continuous signals for tracking detection, and can be various modulated communication signals or continuous signals such as beacon signals and the like; in some application scenarios, the tracking receiver needs to use periodic intermittent signals to perform tracking demodulation, such as periodic shielding tracking signals of rotor blades of a helicopter, time division characteristic signals (such as TDMA signals and OFDM signals) of which periodic time slots are distributed to multiple users, and the like, and therefore local synchronous time slot edges are generated through an edge self-synchronous detection algorithm, including edges when signals possibly exist and edges when signals disappear, signal detection such as tracking demodulation is performed in the signal duration of the possibly existing signals, meanwhile, the existence detection of the signals is performed at the end of the signal duration interval to obtain the existence of the signals, the tracking demodulation is performed when the signals exist, and no signal step is output. The synchronous signals of the signal occurrence edge and the signal ending edge provided by other equipment cannot be obtained in the stage of the initial satellite tracking of the antenna, so that a self-synchronizing method aiming at periodic intermittent signals needs to be designed; in addition, for the spectrum and signal characteristic monitoring of TDMA-like signals, it is also necessary to provide signal occurrence edges and signal ending edges for detecting the characteristics and interference of the signals. However, there is no corresponding treatment in the prior art.
Disclosure of Invention
In view of this, the present invention proposes a method for implementing edge self-synchronization of periodic intermittent signals, which can extract local time slots synchronous with intermittent signals without synchronization header information, the time slots indicate the occurrence and disappearance of edges of signals, the implementation method is simple and can work under lower signal-to-noise ratio, self-synchronization of various periodic intermittent signals can be conveniently implemented, and tracking demodulation of modes such as single pulse, electron beam deflection, cone scanning, stepping, etc. can be completed on the basis of the method or the method can be used for detecting characteristics and interference of input signals.
Based on the above purpose, the technical scheme provided by the invention is as follows:
a method for realizing edge self-synchronization of periodic intermittent signal includes such steps as low-noise amplifying, analog down-conversion, gain amplifying, A/D conversion, digital down-conversion, sampling rate extracting and conversion to become zero-intermediate-frequency digital orthogonal signal x with low sampling rate n For signal x n After calculating the autocorrelation power, performing edge detection based on double sliding windows to obtain initial rising edge pulse and falling edge pulse disappearing from input signal in signal duration, converting the set signal duration period into frequency control word, and performing phase accumulation under the drive of local clock to generate periodic sawtooth wave phase p Σ The method comprises the steps of carrying out a first treatment on the surface of the The method also comprises the following steps:
(1) The rising edge time difference detection is carried out on the rising edge detected by the double sliding window and the locally generated synchronous rising edge pulse to obtain t ri Detecting the time difference between the falling edge detected by the double sliding window and the falling edge pulse generated locally to obtain t di Respectively time difference t ri 、t di Caching;
(2) For caching after a period of timeTime difference t of rising edge ri Time difference t of falling edge di Respectively performing statistical extraction to obtain rising edge statistical time differenceFalling edge statistical time difference->
(3) Statistical time difference of rising edgeFalling edge statistical time difference->Respectively into phase differences deltap r 、Δp d Then, respectively phase differences p with the rising edges of the current setting r Phase difference p of falling edge d After addition, a new rising edge phase difference p is obtained r Phase difference p of falling edge d The new phase difference is respectively compared with the phase p output by the phase accumulator Σ Adding to obtain the real-time rising edge phase p Σ +p r With falling edge phase p Σ +p d ；
(4) Rising edge phase p Σ +p r Generating periodic local synchronous rising edge pulse after comparing with threshold, falling edge phase p Σ +p d Generating periodic local synchronous falling edge pulses after comparison with a threshold;
(5) The periodic synchronous rising edge pulse and the synchronous falling edge pulse are combined into a local synchronous time slot signal.
From the above description, the beneficial effects of the invention are as follows:
1. the invention can generate the local periodic time slot synchronous signal according to the received intermittent signal without priori knowledge, the synchronous signal can accurately indicate the possible occurrence time and disappearance time of the intermittent signal in the future period, integrates the signal power in the signal duration period, and can conveniently judge whether the signal exists in the duration period.
2. The invention can adapt to various periodic intermittent signals, such as signals generated by shielding continuous signals by helicopter rotors, one or more channels of TDMA communication signals and OFDM signals, and the like.
3. The invention has simple algorithm, can adopt high-speed FPGA (field programmable gate array), or DSP chip, or GPU and other high-speed digital chips as hardware for algorithm realization, and the equipment manufactured by the principle has the advantages of high integration degree, small volume, simple structure, high reliability, easy upgrading and the like.
Drawings
Fig. 1 is a schematic block diagram of a periodic intermittent signal for implementing edge self-synchronization in an embodiment of the present invention.
Fig. 2 is a waveform diagram illustrating edge self-synchronization to TDMA signals in an embodiment of the present invention. In fig. 2, signal power is a schematic waveform of TDMA signal after power is taken, and it can be seen that there are three signal duration slots in the graph; the edge detection waveform shows a signal waveform diagram synthesized after double sliding window detection, so that the rising edge and the falling edge of the signal duration period can be accurately detected under the condition that the signal-to-noise ratio meets the requirement; it can be seen that, before the phase adjustment, the periodic waveform of the local synchronization time slot has a delay difference with the rising edge and the falling edge of the two signal duration periods in the signal waveform diagram after the double sliding window detection, and after the phase adjustment of the embodiment of the invention, the synchronization of the TD signal duration period, the TD signal guard interval and the input signal of the locally generated synchronization time slot is completed.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
A method for realizing edge self-synchronization of periodic intermittent signal, which assumes that the signal generated by antenna is processed by low noise amplification, analog down-conversion, gain amplification, A/D conversion, digital down-conversion, sampling rate extraction conversion and the like to become zero intermediate frequency digital quadrature signal x with lower sampling rate n For signal x n Computing autocorrelationAfter power, edge detection based on double sliding windows is carried out to obtain initial rising edge pulse in signal duration period and falling edge pulse disappearing from input signal, the set signal duration period is converted into frequency control word, and then phase accumulation is carried out under the drive of local clock to generate periodic sawtooth wave phase p Σ The method comprises the steps of carrying out a first treatment on the surface of the The method comprises the following steps:
(1) The rising edge time difference detection is carried out on the rising edge detected by the double sliding window and the locally generated synchronous rising edge pulse to obtain t ri Detecting the time difference between the falling edge detected by the double sliding window and the falling edge pulse generated locally to obtain t di Respectively time difference t ri 、t di Caching;
(2) For rising edge time difference t after buffering for a period of time ri Time difference t of falling edge di Respectively performing statistical extraction to obtain rising edge statistical time differenceFalling edge statistical time difference->
(3) Statistical time difference of rising edgeFalling edge statistical time difference->Respectively into phase differences deltap r 、Δp d Then, respectively phase differences p with the rising edges of the current setting r Phase difference p of falling edge d After addition, a new rising edge phase difference p is obtained r Phase difference p of falling edge d The new phase difference is respectively compared with the phase p output by the phase accumulator Σ Adding to obtain the real-time rising edge phase p Σ +p r With falling edge phase p Σ +p d ；
(4) Rising edge phase p Σ +p r Generating periodic local identity after comparison with thresholdStep rising edge pulse, falling edge phase p Σ +p d Generating periodic local synchronous falling edge pulses after comparison with a threshold;
(5) The periodic synchronous rising edge pulse and the synchronous falling edge pulse are combined into a local synchronous time slot signal.
The following is a more specific example:
as shown in fig. 1, it is assumed that the signal generated by the antenna is converted into a zero intermediate frequency digital quadrature signal x with a lower sampling rate by low noise amplification, analog down conversion, gain amplification, a/D conversion, digital down conversion, sampling rate decimation conversion, and the like n The signal expression is:
wherein a [ n ]]For modulating amplitude of communication signal, thetan]For modulating phase of communication signal, θn]For Gaussian white noise, ω, contained in the communication signal 0 Is the center frequency of the sum signal residual which is small enough, and gamma is the initial phase of the communication signal;
for signal x n After calculating the autocorrelation power, performing edge detection based on a double sliding window to obtain an initial rising edge pulse in a signal duration period and a falling edge pulse disappearing from an input signal;
the derived signal autocorrelation power may beDelayed autocorrelation +.>When comparing the double sliding windows, there is a smooth window with no signal at the power point, and a smooth window contains all signal power points. To->For example, a smoothed intra-window power point is thus obtained:
sliding windowSmoothing of the total content signal:
smoothing of noise is all within the smooth window:
wherein p is s Average power for signal sampling point, p n The power is averaged for the noise samples.
The dual sliding window compares different edges of the signal duration: the maximum point of the rising edge isThe minimum point of the falling edge is +.>The initial rising edge pulse of the input signal and the falling edge pulse of the input signal disappearing can be obtained by respectively comparing the initial rising edge pulse with the threshold and selecting the maximum point and the minimum point;
after the set signal is continuously and periodically converted into a frequency control word, the phase accumulation is carried out under the drive of a local clock to generate a periodic sawtooth wave phase p Σ ；
For TDMA signals, helicopter rotor shielding, OFDM signals, etc., the signal duration period can be predicted in general, for example, the slot period of the TDMA signal is 1.02ms, the helicopter rotor shielding period is 20ms, and one subframe period of the OFDM is 1ms, etc.;
the signal duration period is converted into a frequency control word which is the same as the frequency control word of the NCO;
the phase accumulator works the same as NCO, under the control of each local clock, the frequency control word is accumulated once without symbol, and the output phase is abandoned;
the method aims at the processed rising edge pulse and falling edge pulse and the self-synchronous rising edge pulse and falling edge pulse generated locally, and the signal processing process is shown in figure 1 and comprises the following steps:
(1) The rising edge time difference detection is carried out on the rising edge detected by the double sliding window and the locally generated synchronous rising edge pulse to obtain t ri Detecting the time difference between the falling edge detected by the double sliding window and the falling edge pulse generated locally to obtain t di Respectively time difference t ri 、t di And caching.
The edge time difference detection method is numerous, and a high-speed clock counting mode can be adopted. For the rising edge time difference value t ri Buffer-storing in a RAM space, for the difference t of falling edge time di And the buffer memory is cached in another RAM space, so that the subsequent processing is convenient. For the case of predicting signal duration (e.g. TDMA signal), the time difference value t can be achieved by presetting the phase ri 、t di Equivalent, therefore time difference value t ri 、t di May be stored in the same space.
(2) For rising edge time difference t after buffering for a period of time ri Time difference t of falling edge di Respectively performing statistical extraction to obtain rising edge statistical time differenceFalling edge statistical time difference->
The buffering time is m detected time differences (m is usually greater than 10), and can be fixed to n local pulse periods, and the buffering time is adjusted according to the specific application.
The statistical time difference extraction may use a simple statistical histogram method, such as for m rising edge time differences t r1 ～t rm Dividing the signal duration period T into 10 fixed sections, and adding 1 to the section count when m rising edge time differences are in the section; the rising edge time difference corresponding to the maximum section of the count value is taken to be averaged, and the rising edge statistical time difference can be obtainedSo that occasional misjudgment time differences can be eliminated; similarly, the statistical time difference of the falling edge can be obtained>
(3) Statistical time difference of rising edgeFalling edge statistical time difference->Respectively into phase differences deltap r 、Δp d Then, respectively phase differences p with the rising edges of the current setting r Phase difference p of falling edge d After addition, a new rising edge phase difference p is obtained r Phase difference p of falling edge d The new phase difference is respectively compared with the phase p output by the phase accumulator Σ Adding to obtain the real-time rising edge phase p Σ +p r With falling edge phase p Σ +p d 。
Statistical time differenceConverted into phase difference Deltap r Can be calculated by the following formula:
wherein the method comprises the steps ofFor the lower rounding, T is the signal duration and q is the binary number of bits of the phase.
The new phase difference is set to the q-bit number of the discard carry: Δp r +p r →p r ，Δp d +p d →p d
Rising edge phase p Σ +p r The calculation of (2) is also a q-bit number discarding the carry.
The same procedure was used to obtain p Σ +p d 。
(4) Rising edge phase p Σ +p r Comparison with thresholdAfter which a periodic local synchronous rising edge pulse is generated, the falling edge phase p Σ +p d A periodic locally synchronous falling edge pulse is generated after comparison with a threshold.
The rising edge threshold is typically taken to be 2 q-1 If at a certain time p Σ +p r From below 2 q-1 To greater than or equal to 2 q-1 And outputting a local rising edge pulse, wherein the pulse bandwidth is greater than 1 clock period.
Likewise, the falling edge threshold is typically taken to be 2 q-1 If at a certain time p Σ +p d From below 2 q-1 To greater than or equal to 2 q-1 And outputting a local falling edge pulse, wherein the pulse bandwidth is greater than 1 clock period.
(5) The periodic synchronous rising edge pulse and the synchronous falling edge pulse are combined into a local synchronous time slot signal.
The waveform diagram for edge self-synchronization of TDMA signals shown in fig. 2 shows the time difference between the intermittent signal, the detected edge of the signal, and the edge of the local synchronization slot before and after the phase adjustment.
In a word, the invention comprises the processing steps of signal detection, edge self-synchronous detection, signal existence detection, output selection and the like, and realizes the tracking demodulation of periodic intermittent signals. The invention dynamically adjusts the signal duration and the signal loss period of the local synchronous signal based on negative feedback, realizes the local edge self-synchronization of signals such as TDMA signals, helicopter rotor wing shielding signals and the like, has the advantages of no need of priori knowledge such as synchronization heads and the like, high integration degree, low working signal to noise ratio, simple algorithm and the like, and can be used as a basis for realizing self-tracking by using intermittent signals in a satellite communication antenna.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples. Any omission, modification, equivalent replacement, improvement, etc. of the above embodiments should be included in the protection scope of the present invention, while remaining within the spirit and principle of the present invention.
Claims (1)
1. A method for realizing edge self-synchronization of periodic intermittent signal includes such steps as low-noise amplifying, analog down-conversion, gain amplifying, A/D conversion, digital down-conversion, sampling rate extracting and conversion to become zero-intermediate-frequency digital orthogonal signal x with low sampling rate n For signal x n After calculating the autocorrelation power, performing edge detection based on double sliding windows to obtain initial rising edge pulse and falling edge pulse disappearing from input signal in signal duration, converting the set signal duration period into frequency control word, and performing phase accumulation under the drive of local clock to generate periodic sawtooth wave phase p Σ The method comprises the steps of carrying out a first treatment on the surface of the The method is characterized by further comprising the following steps:
(1) The rising edge time difference detection is carried out on the rising edge detected by the double sliding window and the locally generated synchronous rising edge pulse to obtain t ri Detecting the time difference between the falling edge detected by the double sliding window and the falling edge pulse generated locally to obtain t di Respectively time difference t ri 、t di Caching;
(2) For rising edge time difference t after buffering for a period of time ri Time difference t of falling edge di Respectively performing statistical extraction to obtain rising edge statistical time differenceFalling edge statistical time difference->
(3) Statistical time difference of rising edgeFalling edge statistical time difference->Respectively into phase differences deltap r 、Δp d Then, respectively phase differences p with the rising edges of the current setting r Descending and descendingAlong phase difference p d After addition, a new rising edge phase difference p is obtained r Phase difference p of falling edge d The new phase difference is respectively compared with the phase p output by the phase accumulator Σ Adding to obtain the real-time rising edge phase p Σ +p r With falling edge phase p Σ +p d ；
(4) Rising edge phase p Σ +p r Generating periodic local synchronous rising edge pulse after comparing with threshold, falling edge phase p Σ +p d Generating periodic local synchronous falling edge pulses after comparison with a threshold;
(5) The periodic synchronous rising edge pulse and the synchronous falling edge pulse are combined into a local synchronous time slot signal.
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| WO2005121818A1 (en) * | 2004-06-14 | 2005-12-22 | Forschungszentrum Jülich GmbH | Method and device for measuring a signal |
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| JP2008199205A (en) * | 2007-02-09 | 2008-08-28 | Yamaha Corp | Transmission rate discrimination circuit and digital signal demodulator provided with the circuit |
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