CN104735007B - The unconfined direct intermediate-frequency channel method of a kind of pair of centre frequency - Google Patents
The unconfined direct intermediate-frequency channel method of a kind of pair of centre frequency Download PDFInfo
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Abstract
The disclosure of the invention a kind of pair of centre frequency unconfined direct intermediate-frequency channel method, belongs to digital signal processing technique field, and in particular to digital channelizing technology.The data transfer rate for reducing signal in such a way that multiple branches and D times extract first guarantees not losing completely for data；Multiple branches are filtered again, then carry out inverse discrete Fourier transform, finally multiple output signals are modulated, obtain the output signal of each channel.The invention only needs 1 filter just while obtaining K sub-channels signal；Channelizing directly is carried out to intermediate-freuqncy signal, the channelization block after saving the multidiameter delay DDC and DDC of Conventional wide band digital channelizing method；The position of the IF frequency of sub-channel does not have special limitation, the coefficient that only need to change complex filter when the centre frequency of subchannel is integrally moved to left or moved to right and the complex modulated signal after inverse discrete Fourier transform.
Description
Technical field
The invention belongs to digital signal processing technique fields, and in particular to digital channelizing technology.
Background technique
Electronic warfare is the important component in modern battlefield, has significant impact to the result of war.EW receiver
It is the important system in electronic warfare, there is important researching value.
On modern battlefield, no matter highdensity electromagnetic signal is all flooded in the time domain or on frequency domain, to electronic warfare
Receiver proposes new challenge.These signals have the following characteristics that frequency range is wide, the work of current most of radar systems
Working frequency range is covered on 2~18GHz；Instant bandwidth is big, and the bandwidth of operation of certain wideband radars is more than 1GHz；Signal density
Greatly, it is directed to the full frequency band receiver of 0.1~40GHz frequency range at present, signal density is up to per second 100~5,000,000 pulses.This
A little features require modern electronic warfare receivers have big instant bandwidth, be capable of handling multiple while arriving signal, strong real-time etc.
Performance.
In the developing history of EW receiver, there is the receiver of many types, such as crystal video receiver, wink
When frequency measuring receiver, superhet, compressive receiver, Prague receiver, channelized receiver.Various types of receptions
Machine is all defective, and the requirement of electronic warfare, in contrast, Digital Channelized Receiving can be ideally met without any kind of receiver
Machine because its to simultaneously arriving signal have best sorting capability, most have application value in electronic warfare, by various countries extensively and
In-depth study.
In traditional digital channelized receiver, usually first with DDC (Digital Down Converter, number
Low-converter) intermediate frequency real signal is converted into baseband complex signal, then utilize highly effective algorithm (such as discrete Fourier transform, discrete
Cosine transform etc.) realize channelizing.When the bandwidth for inputting intermediate frequency real signal is very big, due to the operation energy of digital signal processor
Power is limited, needs multiple DDC that big bandwidth channel is divided into multiple small bandwidth channels, then respectively to multiple small bandwidth channels into
One step channelizing.This process is equivalent to two-stage channelizing, and the first order carries out coarse channel using DDC, and the second level is using efficiently
Algorithm carries out thin channelizing.The operation efficiency of this method is low, at high cost, and becomes with the increase of input signal bandwidth
It becomes increasingly complex.
In order to solve the problems, such as that the low efficiency of multi-stage channel, at high cost, structure is complicated, the invention proposes a kind of direct
To the method that intermediate-freuqncy signal carries out channelizing, this method only needs level-one operation that channelizing can be realized, and this method is ingenious
Ground optimizes operation efficiency using multiphase filtering and IDFT (inverse discrete Fourier transform).Another advantage of this method is, right
The centre frequency of input intermediate-freuqncy signal does not have special requirement.Relative to traditional channelization method, the utilization of resources of this method
Rate, operation efficiency increase substantially.
Summary of the invention
The technical problem to be solved by the invention is to provide the method for a kind of pair of wideband IF signal direct channels, from
And achieve the purpose that required computing resource is few, at low cost, high-efficient.
The present invention is to solve above-mentioned technical problem the technical scheme adopted is that a kind of pair of centre frequency is unconfined directly
Intermediate-frequency channel method.
In the present invention, it is assumed that receiving intermediate frequency signal is as shown in Figure 1.In Fig. 1, the bandwidth of intermediate-freuqncy signal is B, occupies K
Subchannel, the bandwidth of subchannel and centre frequency interval are all △ B=2 π/M=B/K, wherein M be positive integer, referred to as channel because
Son.The centre frequency of k-th of subchannel is ωk=ω0+ 2 π k/M, wherein ω0For the centre frequency of the 0th sub-channels, ω0It can
With any position in (0, π) range, as long as meeting the condition of frequency spectrum not aliasing.
The structural block diagram for obtaining k-th of sub-channel signal using DDC is as shown in Figure 2.If the length of filter h [n] is N,
And N and channel factors M meet relational expression N=LM, wherein L is positive integer.Then the output signal of k-th of subchannel can be expressed as
Formula 1.
Formula 1
When channel factors M and decimation factor D meet relational expression M=FD (F is positive integer), enable in formula 1If regarding w [m] as new complex filter, and M phase decomposition is carried out to it, formula 2 can be obtained.
Formula 2
Enable xp[i]=x [iD-p], gp[i]=w [iM+p], cp[i]=gp[i/F] (i.e. cp[i] is gpIn F times of [i]
Insert), then formula 2 can be equivalent to formula 3, wherein " * " indicates convolution algorithm, MIDFTk{ x } indicates to carry out x M point IDFT fortune
K-th of the output calculated.
Formula 3
The corresponding channelization structure of formula 3 is as shown in Figure 3.In Fig. 3, each operation can only obtain the output of a sub-channels
yk[n], efficiency is lower.After complex mixer before filter in Fig. 3 is moved on to IDFT module, the equivalent structure such as Fig. 4 is obtained.
In Fig. 4, the output of IDFT is all multiplied with the same complex exponential signal, only one branch of the result of multiplication is effective.If
Each output signal of IDFT is multiplied with corresponding complex exponential signal, then can export K sub-channels signal simultaneously, thus
The efficient channel structure arrived is as shown in Figure 5.
The unconfined direct intermediate-frequency channel method of a kind of pair of centre frequency of the invention, method includes the following steps:
Step 1: the bandwidth of receiving intermediate frequency signal, the intermediate-freuqncy signal is B, occupies K sub-channels, will receive signal successively
M branch is inputted, successively one sampling period of time delay when every branch input signal；D times is carried out to M branch again to extract, it will
Data transfer rate falls below the 1/D of receiving data rate；Wherein M is integer, and value is by formula fs/ M=B/K is determining, fsTo receive signal
Sample rate；
Step 2: plural multiphase filtering is carried out to the extraction data of M branch；
Step 3: leaf inverse transformation in M point discrete Fourier being carried out to the output signal that M phase filters, obtains M intermediate output signal；
Step 4: complex-exponential-modulation being carried out to the preceding K output signal that step 3 obtains, obtains final K sub-channels letter
Number.
The step 2 is to M branch according to complex filterMultiphase filtering is carried out, wherein h [m] is
Prototype lowpass filter corresponding with subchannel bandwidth, ω0Indicate the centre frequency of the 0th sub-channels.
The step 4 uses signalComplex-exponential-modulation is carried out to the preceding K output signal that step 3 obtains, wherein n
Round numbers.
The present invention has fully considered the characteristics of IF input signals, realizes direct intermediate frequency using multiphase filtering and IDFT operation
Channelizing.The beneficial effects of the present invention are:
1, the 1st step first extracts, and the data transfer rate of subsequent processing falls below the 1/D of input data rate, and operation efficiency is high；
2, multiphase filtering and IDFT operation are utilized, it is only necessary to which 1 filter just obtains K sub-channels signal simultaneously；
3, channelizing directly is carried out to intermediate-freuqncy signal, saves the multidiameter delay DDC of Conventional wide band digital channelizing method
With the channelization block after DDC, required resource is greatly reduced；
4, the position of the IF frequency of sub-channel does not have special limitation, integrally move to left when the centre frequency of subchannel or
The coefficient w [n] that only need to change complex filter in Fig. 5 when moving to right and the complex modulated signal after IDFT?.
Detailed description of the invention
Fig. 1 is the division for inputting intermediate-freuqncy signal and subchannel；
Fig. 2 is the structural block diagram that k-th of sub-channel signal is obtained using DDC；
Fig. 3 is direct intermediate-frequency channel structure of the invention；
Fig. 4 is the equivalent structure of direct intermediate-frequency channel of the invention；
Fig. 5 is the efficient configuration of direct intermediate-frequency channel of the invention；
Fig. 6 (a) is the channel division method of simulation example and the amplitude-frequency characteristic of filter；
Fig. 6 (b) is the amplitude-frequency characteristic of the input signal of simulation example；
Fig. 7 is the amplitude-frequency characteristic of the output signal of the subchannel of simulation example；
Fig. 8 is the output signal real part waveform of the subchannel of simulation example；
Fig. 9 is the output signal imaginary part waveform of the subchannel of simulation example；
Figure 10 is the instantaneous amplitude of the output signal of the subchannel of simulation example.
Specific embodiment
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright implementation method, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.Ability
The those of ordinary skill in domain disclosed the technical disclosures can make its various for not departing from essence of the invention according to the present invention
Its various specific variations and combinations, these variations and combinations are still within the scope of the present invention.
In following simulation example, sample rate fs=160MHz, channel factors M=16, subchannel bandwidth △ B=
10MHz, number of subchannels K=4, decimation factor D=8, the output sampling rate of subchannel are 20MHz.The centre frequency of subchannel
As shown in table 1 with input signal, input signal is the summation of 3 kinds of signals in table 1.Simulation result is as shown in Fig. 6~10.
Fig. 6 (a) is the amplitude-frequency characteristic of channel division method and filter.The passband corner frequency of lowpass prototype filter is
5MHz, stopband corner frequency are 5.5MHz.Here in order to draw conveniently, the amplitude-versus-frequency curve of the filter of each channel is moved
Onto respective centre frequency, a low-pass filter actually need to be only used.
Fig. 6 (b) is the amplitude-frequency characteristic of input signal, and input signal is the summation of 3 kinds of signals in table 1.
Fig. 7 is the amplitude-frequency characteristic of the output signal of subchannel, and Fig. 8 is corresponding real part waveform, and Fig. 9 is corresponding imaginary part wave
Shape.There is no signal in channel 2, outputs corresponding input signal in channel 1,3,4, demonstrate channelization method of the invention
Correctness.Signal other than the ± 5MHz of each channel is inhibited by filter, small within Amplitude Ratio ± 5MHz.
Figure 10 is the instantaneous amplitude of the output signal of subchannel.Instantaneous amplitude in channel 1,3,4 be obviously not zero when
Between it is identical with the duration of input signal.In channel 2, there are some irregular spikes, this is because the mistake of filter
Crossing band can not be zero, stopband it is not possible that infinite attenuation, the signal of other channels can be come in aliasing.These spikes it is lasting when
Between it is very short and irregular, it can be determined that reject.
The simulated conditions of the direct intermediate-frequency channel method unconfined to centre frequency of table 1
| Channel number | Channel center frequency | Input signal |
| 1 | 33MHz | Real cosine continuous signal: f0=34MHz |
| 2 | 43MHz | Nothing |
| 3 | 53MHz | Solid linear chirp signal: f0=51MHz, B=2MHz, the μ of τ=20 s |
| 4 | 63MHz | Solid linear chirp signal: f0=64MHz, B=5MHz, the μ of τ=10 s |
Claims (3)
1. the unconfined direct intermediate-frequency channel method of a kind of pair of centre frequency, method includes the following steps:
Step 1: the bandwidth of receiving intermediate frequency signal, the intermediate-freuqncy signal is B, occupies K sub-channels, will receive signal and sequentially inputs
M branch, successively one sampling period of time delay when every branch input signal；It carries out D times to M branch again to extract, by data
Rate falls below the 1/D of receiving data rate；Wherein M is integer, and value is by formula fs/ M=B/K is determining, fsFor the sampling for receiving signal
Rate；
Step 2: plural multiphase filtering is carried out to the extraction data of M branch；
Step 3: leaf inverse transformation in M point discrete Fourier being carried out to the output signal that M phase filters, obtains M intermediate output signal；
Step 4: complex-exponential-modulation being carried out to the preceding K output signal that step 3 obtains, obtains final K sub-channels signal.
2. the unconfined direct intermediate-frequency channel method of a kind of pair of centre frequency as described in claim 1, it is characterised in that step
Rapid 2 pairs of M branches are according to complex filterMultiphase filtering is carried out, wherein h [m] is and subchannel bandwidth pair
The prototype lowpass filter answered, ω0Indicate the centre frequency of the 0th sub-channels.
3. the unconfined direct intermediate-frequency channel method of a kind of pair of centre frequency as claimed in claim 2, it is characterised in that institute
Step 4 is stated using signalComplex-exponential-modulation, wherein n round numbers are carried out to the preceding K output signal that step 3 obtains.
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| CN107749762A (en) * | 2017-09-26 | 2018-03-02 | 天津光电通信技术有限公司 | A kind of multiphase filtering digital channelizing implementation method |
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