CN105790861A - Frequency domain measuring system for digital channelized receiver - Google Patents

Frequency domain measuring system for digital channelized receiver Download PDF

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Publication number
CN105790861A
CN105790861A CN201410818071.2A CN201410818071A CN105790861A CN 105790861 A CN105790861 A CN 105790861A CN 201410818071 A CN201410818071 A CN 201410818071A CN 105790861 A CN105790861 A CN 105790861A
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China
Prior art keywords
frequency
threshold detection
detection device
data storage
frequency domain
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CN201410818071.2A
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Inventor
宋勇辉
戴吉
刘冰冰
何国辉
张志明
冷盛林
吴红生
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8511 Research Institute of CASIC
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8511 Research Institute of CASIC
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Priority to CN201410818071.2A priority Critical patent/CN105790861A/en
Publication of CN105790861A publication Critical patent/CN105790861A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a frequency domain measuring system for a digital channelized receiver. The frequency domain measuring system comprises an analog-digital conversion device, a multi-phase filtering device, an FFT (Fast Fourier Transform) calculation device, a threshold detection device, a frequency calculation device and a data storage device which are connected in sequence, wherein an output end of the threshold detection device is connected with an input end of the data storage device; and the multi-phase filtering device is arranged in front of the FFT calculation device, thereby reconstructing a channelized prototype filter, widening a main lobe of the filter, and compressing a side lobe. The frequency domain measuring system has the advantages of high frequency measuring accuracy and high frequency measuring speed, and can measure a plurality of signals which arrive at the same time.

Description

A kind of frequency domain measurement system of digital channelized receiver
Technical field
The invention belongs to electronic reconnaissance field, be specifically related to the frequency domain measurement system of a kind of digital channelized receiver.
Background technology
Along with developing and the raising of numeral conversion speed of A-D converter (ADC), the digitized of electronic warfare (EW) receiver is possibly realized, first digital receiver down-converts to intermediate-freuqncy signal (IF) input signal, then with high speed many bit A/D C, it is digitized, and adopts Digital Signal Processing to produce desired pulse descriptive word (PDW).
Digital Signal Processing is owing to being absent from the phenomenons such as temperature drift in analog circuit, change in gain or DC shift, so having better stability.Digital processing has processing gain, it is possible to realize low signal-to-noise ratio frequency measurement, additionally adopts suitable algorithm can obtain the frequency-measurement accuracy higher than analog receiver.
The unique practical method realizing wideband digital EW receiver by modern technologies is to be processed by channelization technique.EW receiver requires the real-time process to high density stream of pulses, it is desirable to the intercepting and capturing of full frequency band high probability, it is desirable to can processing the signal simultaneously arrived and frequency accurate measurement etc., digital channelized receiver disclosure satisfy that these requirements.
Recent years, digital channelized receiver has also carried out development at home, and disclose a temporal frequency domain for digital channelized receiver and measure the patent of system, but there is some defect in this system, the frequency response of channel filter is uneven in main lobe, the measurement of signal amplitude is had bigger distortion, when frequency input signal deviates channel center, the decline of processing gain makes output signal-to-noise ratio decline, frequency-measurement accuracy can decline therewith, frequency leak is there is in the middle of two wave filter of channelizing, when inputting signal and being positioned at these frequency leaks, can not be detected, additionally the secondary lobe of channel filter is too high, one radar signal can be responded by adjacent a series of wave filter, dynamic range is very low, these have the drawback that EW receiver is unacceptable.
Summary of the invention
It is an object of the invention to provide the frequency domain measurement system of a kind of digital channelized receiver, solve when frequency input signal is positioned at these frequency leaks, it is impossible to the problem being detected, and input signal amplitude is measured the problem that distortion is bigger.
The technical solution realizing the object of the invention is: the frequency domain measurement system of a kind of digital channelized receiver, including the analog to digital conversion device being sequentially connected with, multiphase filtering device, FFT calculation element, Threshold detection device, frequency calculation means device and data storage device, the outfan of Threshold detection device is connected with the input of data storage device, pulse intermediate-freuqncy signal through down coversion converts analog signals into digital signal by analog to digital conversion device, after multiphase filtering device filters, incoming FFT calculation element, instantaneous amplitude and the instantaneous phase of data signal calculated is exported by FFT calculation element, enter back into Threshold detection device, amplitude is encoded by Threshold detection device, if amplitude exceedes the thresholding of setting, interrupt request singal is sent to ppu by output port P1;The instantaneous phase data of Threshold detection device output, completed frequency measurement by frequency calculation means device and be encoded, data storage device receives the frequency coding from frequency calculation means device output, also receive from the pulse width of Threshold detection device output, the time of advent and amplitude coding simultaneously, forming the storage of pulse descriptive word, data storage device also provides for ppu and reads the data-out port P2 of pulse descriptive word.
It is universal input and output port (GPIO) that above-mentioned Threshold detection device is provided with interrupt request singal output port P1, the P1 port to ppu.
It is universal input and output port (GPIO) that above-mentioned data storage device is provided with data-out port P2, the P2 port being supplied to ppu reading pulse descriptive word.
The present invention compared with prior art, its remarkable advantage: (1) compensate for system frequency leak, solve when frequency input signal is positioned at these frequency leaks, it is impossible to the problem being detected.
(2) smoothed the amplitude-frequency characteristic of system, solved and input signal amplitude is measured the problem that distortion is bigger.
(3) be conducive to catching narrower pulse.
(4) frequency-measurement accuracy is high, and frequency measurement speed is fast, it is possible to measure the multiple signals simultaneously arrived.
Accompanying drawing explanation
Fig. 1 is the frequency domain measurement system structure schematic diagram of a kind of digital channelized receiver of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
In conjunction with Fig. 1, a kind of frequency domain measurement system of digital channelized receiver, it is characterized in that: include the analog to digital conversion device being sequentially connected with, multiphase filtering device, FFT calculation element, Threshold detection device, frequency calculation means device and data storage device, the outfan of Threshold detection device is connected with the input of data storage device, input port P3 is the pulse intermediate-freuqncy signal through down coversion, digital signal is converted analog signals into by analog to digital conversion device, after multiphase filtering device filters, incoming FFT calculation element, instantaneous amplitude and the instantaneous phase of data signal calculated is exported by FFT calculation element, enter back into Threshold detection device, amplitude is encoded by Threshold detection device, if amplitude exceedes the thresholding of setting, interrupt request singal is sent to ppu by output port P1;The instantaneous phase data of Threshold detection device output, completed frequency measurement by frequency calculation means device and be encoded, data storage device receives the frequency coding from frequency calculation means device output, also receive from the pulse width of Threshold detection device output, the time of advent and amplitude coding simultaneously, forming the storage of pulse descriptive word, data storage device also provides for ppu and reads the data-out port P2 of pulse descriptive word.
It is universal input and output port (GPIO) that above-mentioned Threshold detection device is provided with interrupt request singal output port P1, the P1 port to ppu.
It is universal input and output port (GPIO) that above-mentioned data storage device is provided with data-out port P2, the P2 port being supplied to ppu reading pulse descriptive word.
FFT can be equivalent to bank of filters, and therefore FFT calculation element as the direct way of frequency domain channel, can utilize this technology more simple than the method for designing of single filter.Input data are directly done FFT calculating is worthless, and the bank of filters directly doing FFT calculating composition exists a series of frequency domain leak, and when inputting signal and being positioned at these frequency leaks, the probability intercepted and captured by receiver is extremely low.
Therefore, before FFT calculation element, increase a multiphase filtering device, multiphase filtering device is reconstructed the original shape wave filter of channelizing, broadening original shape wave filter main lobe also compresses secondary lobe, thus compensate for system frequency leak, also smoothed the amplitude-frequency characteristic of system so that receiver has higher intercept probability in whole frequency range simultaneously.
Threshold detection device has two functions:
1, by the instantaneous amplitude of the output data signal calculated of FFT calculation element and instantaneous phase, and amplitude is encoded, if amplitude exceedes the thresholding of setting, sends interrupt request singal by output port P1 to ppu.
2, continuous print instantaneous amplitude is compared with the thresholding of setting, it is possible to measures pulse width and the time of advent and is encoded.
The instantaneous phase data of Threshold detection device output, are completed frequency measurement by frequency calculation means device and are encoded.
Data storage device receives the frequency coding from the output of FFT calculation element, also receives from the pulse width of Threshold detection device output, the time of advent and amplitude coding simultaneously, forms the storage of pulse descriptive word.Data storage device also provides for ppu and reads the data-out port P2 of pulse descriptive word.
The present invention compensate for system frequency leak, solves when frequency input signal is positioned at these frequency leaks, it is impossible to the problem being detected.Smooth the amplitude-frequency characteristic of system, solved and input signal amplitude is measured the problem that distortion is bigger.Be conducive to catching narrower pulse.Frequency-measurement accuracy is high, and frequency measurement speed is fast, it is possible to measure the multiple signals simultaneously arrived.

Claims (3)

1. the frequency domain measurement system of a digital channelized receiver, it is characterized in that: include the analog to digital conversion device being sequentially connected with, multiphase filtering device, FFT calculation element, Threshold detection device, frequency calculation means device and data storage device, the outfan of Threshold detection device is connected with the input of data storage device, pulse intermediate-freuqncy signal through down coversion converts analog signals into digital signal by analog to digital conversion device, after multiphase filtering device filters, incoming FFT calculation element, instantaneous amplitude and the instantaneous phase of data signal calculated is exported by FFT calculation element, enter back into Threshold detection device, amplitude is encoded by Threshold detection device, if amplitude exceedes the thresholding of setting, interrupt request singal is sent to ppu by output port P1;The instantaneous phase data of Threshold detection device output, completed frequency measurement by frequency calculation means device and be encoded, data storage device receives the frequency coding from frequency calculation means device output, also receive from the pulse width of Threshold detection device output, the time of advent and amplitude coding simultaneously, forming the storage of pulse descriptive word, data storage device also provides for ppu and reads the data-out port P2 of pulse descriptive word.
2. the frequency domain measurement system of digital channelized receiver according to claim 1, it is characterised in that: it is universal input and output port that above-mentioned Threshold detection device is provided with interrupt request singal output port P1, the P1 port to ppu.
3. the frequency domain measurement system of digital channelized receiver according to claim 1, it is characterised in that: it is universal input and output port that above-mentioned data storage device is provided with data-out port P2, the P2 port being supplied to ppu reading pulse descriptive word.
CN201410818071.2A 2014-12-24 2014-12-24 Frequency domain measuring system for digital channelized receiver Pending CN105790861A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109617631A (en) * 2018-12-28 2019-04-12 华航高科(北京)技术有限公司 Reconnaissance system adaptive reception method based on the measurement of digital channelizing instantaneous parameters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109617631A (en) * 2018-12-28 2019-04-12 华航高科(北京)技术有限公司 Reconnaissance system adaptive reception method based on the measurement of digital channelizing instantaneous parameters
CN109617631B (en) * 2018-12-28 2021-09-14 华航高科(北京)技术有限公司 Adaptive receiving method of reconnaissance system based on digital channelized instantaneous parameter measurement

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Application publication date: 20160720