CN104218954A - Method and device for compressed sampling of broadband array antenna - Google Patents
Method and device for compressed sampling of broadband array antenna Download PDFInfo
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- CN104218954A CN104218954A CN201410428286.3A CN201410428286A CN104218954A CN 104218954 A CN104218954 A CN 104218954A CN 201410428286 A CN201410428286 A CN 201410428286A CN 104218954 A CN104218954 A CN 104218954A
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Abstract
The invention provides a method and a device for compressed sampling of a broadband array antenna. The method includes that signals received by each array element in the array antenna are divided into two channels, wherein the signals in one channel and periodic broadband analog signals are subjected to multiplication so as to obtain broadband modulation signals, and the signals in the other channel and delayed periodic broadband analog signals are subjected to multiplication so as to obtain delayed broadband modulation signals; the broadband modulation signals and the delayed broadband modulation signals are subjected to low-pass filtering and analog-digital conversion so as to obtain digital sampling signals and delayed digital sampling signals respectively; the digital sampling signals outputted by all the array elements form a virtual array output signal, and the delayed digital sampling signals outputted by all the array elements form another virtual array output signal; as for the two output signals, a distribution condition of array antenna receiving signals in a space domain and a frequency domain is obtained by means of L-array direction finding, and signal output in each direction and each frequency band in the space is further obtained by the aid of a beam forming algorithm. The method has the advantages that the signal sampling rate is decreased, and distortion-free recovery of the signals is completed.
Description
Technical field
The invention belongs to antenna array signals processing technology field and compressed sensing technical field, be specially a kind of Wide band array antenna compressive sampling method and device.
Background technology
If need to recover analog signal undistortedly, according to Nyquist theorem, sample rate can not lower than the twice of signal bandwidth.Along with technical development, the bandwidth of analog signal sharply increases, and the Nyquist sample rate thereupon increased is analog to digital converter brings huge pressure.And compressive sensing theory limits for we break through Nyquist theorem, provide theoretical foundation to carry out sampling far below the sample rate of Nyquist frequency.This theory is pointed out, if signal has openness in some spaces, this can be converted the signal in lower dimensional space by linear change, and according to the low dimensional signal after conversion, undistortedly can recover original signal.
Compressive sensing theory is based upon on the basis of digital signal, cannot directly apply to the analog signal having unlimited dimension.For this problem, current two kinds of important solutions are researched and proposed.The first is analog information transducer, and analog signal is seen as the superposition of multiple tone signal by the method.The method uses Stochastic Modulation in simulation part, makes the spectrum component of signal at base band aliasing, then uses sub-Nyquist to lead and samples.Want the analog signal of good approaching to reality, need the simple signal that quantity is larger, this causes amount of calculation larger.The second is wide-band modulation transducer, and the method sectional-continuous function carries out modeling at frequency domain to analog signal, and the multiple simple signal of non-usage.The method uses parallel organization, by some groups of Stochastic Modulation devices, and low pass filter and low rate A/D coveters composition.
These current two kinds of methods are all the compressed sensing for single broadband analog signal.In field of array antennas, signal has the empty joint sparse characteristic frequently of its uniqueness, if above two kinds of methods directly applied, cannot make full use of the sparse characteristic of broadband array signal.
Summary of the invention
Research for the compression sampling of array broadband signal is blank, the present invention utilizes array broadband signal in the sparse characteristic in frequency domain and spatial domain, adopts compression sampling result, effectively reduces signal sampling rate, and corresponding signal recuperation algorithm is proposed, the undistorted recovery of settling signal.
Technical scheme of the present invention is:
Described a kind of Wide band array antenna compressive sampling method, is characterized in that: adopt following steps:
Step 1: the signal that array element each in array antenna receives is divided into two-way after conditioning, obtain Broad-band Modulated Signal after one road signal and periodic broadband analog signal carry out signal multiplication computing, obtain postponing Broad-band Modulated Signal after another road signal and the periodic broadband analog signal after postponing carry out signal multiplication computing; Broad-band Modulated Signal and delay Broad-band Modulated Signal are respectively through obtaining digital sampled signal after low-pass filtering and analog-to-digital conversion and postponing digital sampled signal; The digital sampled signal that all array element exports forms first virtual-antenna linear array output signal, and the delay digital sampled signal that all array element exports forms second virtual-antenna linear array output signal; The band of described periodic broadband analog signal is wider than the bandwidth of array antenna sampled signal, the retardation of periodic broadband analog signal is followed successively by t/ (N+X) along array element sequence, 2*t/ (N+X), 3*t/ (N+X),, N*t/ (N+X), t are the cycle of periodic broadband analog signal, N is the element number of array in array antenna, X be not less than 2 integer;
Step 2: to first virtual-antenna linear array output signal and second virtual-antenna linear array output signal, adopt the direction finding of L battle array to obtain the distribution situation of array antenna received signals at spatial domain and frequency domain, the signal adopting beamforming algorithm to obtain each frequency range of space all directions further exports.
Described a kind of Wide band array antenna compression sampling device, is characterized in that: comprise simulation part and digital processing part, simulation part is divided into some groups of wideband modulator, often organize wideband modulator, by broadband periodic signal generator, analog multiplier, low pass filter and analog to digital converter composition; Connect two groups of wideband modulator after each array element in array antenna, the signal that each array element receives is divided into two-way after conditioning; After one road signal enters one group of wideband modulator, analog multiplier is inputted together with the periodic broadband analog signal that this group wideband modulator middle width strip periodic signal maker generates, Broad-band Modulated Signal is exported by analog multiplier, Broad-band Modulated Signal is through low pass filter, obtain the low frequency signal that can sample, low pass filter output low frequency signal, through low speed analog to digital converter, obtains digital sampled signal; After another road signal enters another group wideband modulator, analog multiplier is inputted together with the periodic broadband analog signal that the process that this group wideband modulator middle width strip periodic signal maker generates postpones, by analog multiplier output delay Broad-band Modulated Signal, postpone Broad-band Modulated Signal through low pass filter, obtain the delay low frequency signal that can sample, low pass filter output delay low frequency signal, through low speed analog to digital converter, obtains postponing digital sampled signal; The band of described periodic broadband analog signal is wider than the bandwidth of array antenna sampled signal, the retardation of periodic broadband analog signal is followed successively by t/ (N+X) along array element sequence, 2*t/ (N+X), 3*t/ (N+X),, N*t/ (N+X), t are the cycle of periodic broadband analog signal, N is the element number of array in array antenna, X be not less than 2 integer; The digital sampled signal that all array element exports forms first virtual-antenna linear array output signal, and the delay digital sampled signal that all array element exports forms second virtual-antenna linear array output signal; First virtual-antenna linear array output signal and second virtual-antenna linear array output signal export digital processing part, adopt the direction finding of L battle array to obtain the distribution situation of array antenna received signals at spatial domain and frequency domain, the signal adopting beamforming algorithm to obtain each frequency range of space all directions further exports.
Beneficial effect
The present invention carries out wide-band modulation by the radiofrequency signal received antenna, obtains the aliasing signal of different frequency bands signal in base band, completes the compression sampling of broadband analog signal with this.By the timing_delay estimation to periodic broadband analog signal, the base band mixed frequency signal that antenna array is exported has the behavioural characteristic being similar to L array antenna output signal, and utilize this point, use conventional L battle array direction finding and beamforming algorithm to carry out data processing, complete the undistorted recovery of compression sampling signal with this.
Accompanying drawing explanation
Fig. 1 is present system structure chart (for simplicity, only depict the part of an antenna, the part of all the other antennas is identical, and the output of all antennas is input to digital signal processing module all simultaneously).
Fig. 2 is the two-dimentional direction finding result of the invention process example.
Embodiment
Describe the present invention below in conjunction with specific embodiment: this embodiment is implemented under premised on the technology of the present invention method, give detailed execution mode, but protection scope of the present invention is not limited to following embodiment.
This embodiment is the uniform linear array of 20 array elements, and array element distance is 0.15m, has needed compression sampling and the recovery of the signal of the 0-1GHz from different directions, and the sample rate of digital to analog converter is 110MHz.
The device adopted comprises simulation part and digital processing part, and simulation part is divided into some groups of wideband modulator, often organizes wideband modulator, by broadband periodic signal generator, and analog multiplier, low pass filter and analog to digital converter composition.
Two groups of wideband modulator are connect after each array element in array antenna.The signal that each array element receives is divided into two-way after basic filter amplifying processing.
After one road signal enters one group of wideband modulator, analog multiplier is inputted together with the periodic broadband analog signal that this group wideband modulator middle width strip periodic signal maker generates, Broad-band Modulated Signal is exported by analog multiplier, the Broad-band Modulated Signal that analog multiplier exports is through low pass filter, obtain the low frequency signal that can sample, low pass filter output low frequency signal, through low speed analog to digital converter, obtains digital sampled signal, and this digital sampled signal is the output of wideband modulator.
After another road signal enters another group wideband modulator, analog multiplier is inputted together with the periodic broadband analog signal that the process that this group wideband modulator middle width strip periodic signal maker generates postpones, by analog multiplier output delay Broad-band Modulated Signal, the delay Broad-band Modulated Signal that analog multiplier exports is through low pass filter, obtain the delay low frequency signal that can sample, low pass filter output delay low frequency signal, through low speed analog to digital converter, obtains postponing digital sampled signal.
The digital sampled signal that all array element exports forms first group of output, is similar to an antenna linear array and exports, and forms first virtual-antenna linear array output signal; The delay digital sampled signal that all array element exports forms second group of output, is similar to another antenna linear array and exports, and forms second virtual-antenna linear array output signal.First virtual-antenna linear array output signal and second virtual-antenna linear array output signal export digital processing part, adopt conventional L battle array direction finding to obtain the distribution situation of array antenna received signals at spatial domain and frequency domain, the signal adopting beamforming algorithm to obtain each frequency range of space all directions further exports.
In the present invention, periodic broadband analog signal is the programmable periodic broadband analog signal of waveform, its band is wider than the bandwidth of array antenna sampled signal, the retardation of periodic broadband analog signal is followed successively by t/ (N+X) along array element sequence, 2*t/ (N+X), 3*t/ (N+X) ... N*t/ (N+X), t is the cycle of periodic broadband analog signal, and N is the element number of array in array antenna, X be not less than 2 integer.In the present embodiment, the cycle of periodic broadband analog signal is 10ns, and in one-period, the symbol sebolic addressing that signal is made up of-1 and 1 is formed, and one has 22 symbols, is (-1,-1 ,-1 ,+1 ,-1 ,-1,-1 ,-1 ,-1 ,+1 ,-1,-1-1 ,+1 ,-1 ,+1,-1 ,+1 ,-1 ,-1,-1 ,-1), each symbol duration is identical, is 10/22ns.The first via wideband modulator of all bays uses identical periodic broadband analog signal, there is no time delay each other, second tunnel wideband modulator uses this periodic broadband analog signal equally, relative to the periodic broadband analog signal of the first via, its time delay is respectively 10/22ns, 2*10/22ns ..., 20*10/22ns.
The incoming signal of analogue simulation both direction in the present embodiment, the angle of incident direction and array normal direction is respectively 10 ° and 30 °, and signal frequency is respectively 510MHz and 420MHz.The digital angular frequency that first incoming signal corresponds to two virtual line arrays is respectively 0.2782rad and 1.7062rad, and the digital angular frequency that second incoming signal corresponds to two virtual line arrays is respectively 1.0108rad and 2.1532rad.If the signal to noise ratio of the signal that antenna receives is-10dB.On two virtual line arrays using conventional L linear array direction finding to obtain, the contrast of the digital angular frequency of signal and frequency true value as shown in Figure 2.
Claims (2)
1. a Wide band array antenna compressive sampling method, is characterized in that: adopt following steps:
Step 1: the signal that array element each in array antenna receives is divided into two-way after conditioning, obtain Broad-band Modulated Signal after one road signal and periodic broadband analog signal carry out signal multiplication computing, obtain postponing Broad-band Modulated Signal after another road signal and the periodic broadband analog signal after postponing carry out signal multiplication computing; Broad-band Modulated Signal and delay Broad-band Modulated Signal are respectively through obtaining digital sampled signal after low-pass filtering and analog-to-digital conversion and postponing digital sampled signal; The digital sampled signal that all array element exports forms first virtual-antenna linear array output signal, and the delay digital sampled signal that all array element exports forms second virtual-antenna linear array output signal; The band of described periodic broadband analog signal is wider than the bandwidth of array antenna sampled signal, the retardation of periodic broadband analog signal is followed successively by t/ (N+X) along array element sequence, 2*t/ (N+X), 3*t/ (N+X),, N*t/ (N+X), t are the cycle of periodic broadband analog signal, N is the element number of array in array antenna, X be not less than 2 integer;
Step 2: to first virtual-antenna linear array output signal and second virtual-antenna linear array output signal, adopt the direction finding of L battle array to obtain the distribution situation of array antenna received signals at spatial domain and frequency domain, the signal adopting beamforming algorithm to obtain each frequency range of space all directions further exports.
2. a Wide band array antenna compression sampling device, is characterized in that: comprise simulation part and digital processing part, simulation part is divided into some groups of wideband modulator, often organize wideband modulator, by broadband periodic signal generator, analog multiplier, low pass filter and analog to digital converter composition; Connect two groups of wideband modulator after each array element in array antenna, the signal that each array element receives is divided into two-way after conditioning; After one road signal enters one group of wideband modulator, analog multiplier is inputted together with the periodic broadband analog signal that this group wideband modulator middle width strip periodic signal maker generates, Broad-band Modulated Signal is exported by analog multiplier, Broad-band Modulated Signal is through low pass filter, obtain the low frequency signal that can sample, low pass filter output low frequency signal, through low speed analog to digital converter, obtains digital sampled signal; After another road signal enters another group wideband modulator, analog multiplier is inputted together with the periodic broadband analog signal that the process that this group wideband modulator middle width strip periodic signal maker generates postpones, by analog multiplier output delay Broad-band Modulated Signal, postpone Broad-band Modulated Signal through low pass filter, obtain the delay low frequency signal that can sample, low pass filter output delay low frequency signal, through low speed analog to digital converter, obtains postponing digital sampled signal; The band of described periodic broadband analog signal is wider than the bandwidth of array antenna sampled signal, the retardation of periodic broadband analog signal is followed successively by t/ (N+X) along array element sequence, 2*t/ (N+X), 3*t/ (N+X),, N*t/ (N+X), t are the cycle of periodic broadband analog signal, N is the element number of array in array antenna, X be not less than 2 integer; The digital sampled signal that all array element exports forms first virtual-antenna linear array output signal, and the delay digital sampled signal that all array element exports forms second virtual-antenna linear array output signal; First virtual-antenna linear array output signal and second virtual-antenna linear array output signal export digital processing part, adopt the direction finding of L battle array to obtain the distribution situation of array antenna received signals at spatial domain and frequency domain, the signal adopting beamforming algorithm to obtain each frequency range of space all directions further exports.
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| CN107026650A (en) * | 2016-01-29 | 2017-08-08 | 华为技术有限公司 | A kind of simulation low-pass filter, analog information converter and filtering method |
| CN107255793A (en) * | 2017-06-16 | 2017-10-17 | 中国电子科技集团公司第二十九研究所 | A kind of array df method and device for wideband OFDM signal of communication |
| CN108989255A (en) * | 2018-07-16 | 2018-12-11 | 西安电子科技大学 | Multichannel compressive sampling method based on random demodulation principle |
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| CN103684464A (en) * | 2013-11-29 | 2014-03-26 | 西安空间无线电技术研究所 | Under-sampling and processing method for intermediate-frequency signals of autocorrelation microwave radiometers |
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Cited By (4)
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| CN107026650A (en) * | 2016-01-29 | 2017-08-08 | 华为技术有限公司 | A kind of simulation low-pass filter, analog information converter and filtering method |
| CN107026650B (en) * | 2016-01-29 | 2020-10-09 | 华为技术有限公司 | Analog low-pass filter, analog information converter and filtering method |
| CN107255793A (en) * | 2017-06-16 | 2017-10-17 | 中国电子科技集团公司第二十九研究所 | A kind of array df method and device for wideband OFDM signal of communication |
| CN108989255A (en) * | 2018-07-16 | 2018-12-11 | 西安电子科技大学 | Multichannel compressive sampling method based on random demodulation principle |
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