CN105790863A - Single-channel frequency spectrum monitoring device - Google Patents

Abstract

The invention provides a single-channel frequency spectrum monitoring device. By adopting a real-time capture-analysis technology, utilizing broadband sampling, frequency trigger function and high-speed processing characteristic, and retaining signal information in real time, real-time analysis is carried out on a captured signal within a time domain and a frequency domain. By implementing the single-channel frequency spectrum monitoring device disclosed by the invention, the user cost can be effectively reduced and the reliability is improved.

Description

Single channel spectrum monitoring equipment

Technical field

The invention belongs to spectrum monitoring technical field, be specifically related to a kind of single channel spectrum monitoring equipment.

Background technology

Spectrum monitoring equipment serves important function in radio control industry, by electromagnetic environment is monitored, it is possible to provide foundation for system frequency planning and management.

Owing to aerial signal pattern is multiple, such as Frequency Hopping Signal, pulse signal, burst and normal signal etc..Frequency spectrum resource and bandwidth that different signals occupies are also not the same.In order to improve capacity of resisting disturbance, the frequency hopping bandwidth of modern radar and communication system is up to up to a hundred megahertzs, and hop rate also reaches more than thousand jumpings per second.Catching of this high speed skip signal is had great importance in communication and electronic countermeasure with analyzing.How to find that wide interval frequency hopping signal is bigger technological difficulties.Traditional capturing frequency-hopping signal adopts much channel communication to be monitored, and can meet capture rate index request, it is achieved scheme is simple.But due to front end antenna branch, reduce the signal to noise ratio of system sensitivity and signal；And implementation high cost, the burden of several times is added to user.

Summary of the invention

For overcoming above-mentioned the deficiencies in the prior art, the invention provides a kind of single channel spectrum monitoring equipment, including: omnidirectional antenna, radio-frequency transmitter, digital processing element, human-computer interaction module, remote communication module and power supply；

Described omnidirectional antenna, is used for receiving radio-frequency signal.

Described radio-frequency transmitter, for the radio-frequency signal that omnidirectional antenna receives is converted into intermediate-freuqncy signal, and sends digital processing element to；

Described digital processing element, for being monitored frequency spectrum；

Described human-computer interaction module, is used for providing human-computer interaction function；

Described remote communication module, for communicating with between control centre station or other stations；

Described power supply, is used for powering.

Preferably, described digital processing element farther includes Clock management module, A/D modular converter and digital signal processing module；

Described Clock management module, for receiving reference clock signal from radio-frequency transmitter, and is supplied to A/D modular converter by reference clock signal；

Described A/D modular converter, for the reference clock signal using Clock management module to provide, is converted to digital signal by the intermediate-freuqncy signal that described radio-frequency transmitter provides.

Preferably, described digital signal processing module farther includes Digital Down Convert (DDC) module, digital filtering module, FFT module, frequency detection trigger module and Frequency Hopping Signal measurement module；

Described DDC module, for the intermediate-freuqncy signal of input after A/D changes is multiplied by local carrier, then passes through a low pass filter, obtains orthogonal I, Q two paths of signals after down coversion；

Wherein, described input IF signal frequency f0 and sampling rate fs meets f0/fs=(2m+1)/4；Every 2, input traffic being asked its negative, namely takes the complement code of 2, form a new data stream, then new data stream set to 0 every one, the output stream of gained is exactly the signal after down coversion；

After orthogonal digital down coversion, obtain the baseband signal of zero intermediate frequency, the I after down coversion, Q signal are carried out odd even extraction, filters again after the sampling point for 0 is given up；Adopt all-pass filter to correct I/Q road signal in time domain, differ 1/4 sampled point；I/Q road signal after orthogonal digital down coversion is filtered；

Described FFT module, for carrying out FFT to filtered I/Q road signal；

Described frequency detection trigger module, is used for detecting Frequency Hopping Signal；

Described Frequency Hopping Signal measurement module, is used for, when after the triggering signal occurring meeting trigger condition, Frequency Hopping Signal parameter being measured in real time；Described Frequency Hopping Signal parameter includes but not limited to: frequency hopping rate, frequency hopping residence time.

Preferably, described radio-frequency transmitter, by double conversion, radiofrequency signal is processed as intermediate-freuqncy signal, antenna is captured signal be filtered, down coversion, amplification.Wherein radiofrequency signal is after preliminary election filtering and low noise amplification, the the first local oscillator signal multiplication produced with the first local oscillator module obtains the first intermediate-freuqncy signal, after described first intermediate-freuqncy signal is amplified via the first intermediate frequency filtering and the first intermediate frequency, the second local oscillation signal produced with the second local oscillator module is multiplied and obtains the second intermediate-freuqncy signal；Described second intermediate-freuqncy signal is sent to digital processing element；

Radio-frequency transmitter also can generate sampling clock, carries out A/D sampling for A/D modular converter and this clock signal of digital processing element.

Preferably, described digital processing element farther includes quick tuner module, for rf receiver unit interval on schedule is tuned to different frequency range successively to receive the radio-frequency signal of different frequency range.

Preferably, quick tuner module is used for providing reserved interior local oscillator and External Reference signal, and described reserved interior local oscillator is respectively connected to the first frequency mixer and the second frequency mixer by the first phase-locked loop module PLL1 and the second phase-locked loop pll 2；

Described quick tuner module regulates reserved interior local oscillator and External Reference signal successively by inside and outside selector interval on schedule, provides a local oscillation signal and two local oscillation signals to realize different frequency tuning respectively for the first frequency mixer and the second frequency mixer.

Preferably, described Frequency Hopping Signal measurement module uses peak searching algorithm to calculate frequency hopping rate and residence time, search peak signal in the every frame of continuous print, after searching effective peak, the time point that record peak value occurs, when peak value shifts or do not capture effective peak, again record time point, calculate frequency hopping residence time and frequency hopping rate.

Preferably, described single channel spectrum monitoring equipment farther includes scheduler module, for order and result travel direction are differentiated；

Monitoring result if it is determined that order originates from long-range order, is then sent to remote communication module by described scheduler module, if order originates from the order of local Man Machine Interface, then sends the result to native and connects interactive interface.

Preferably, described single channel spectrum monitoring equipment farther includes system recovery module, is used for providing data recovery function；

Described system recovery module is recovered in two ways:

A) total system recovers: after starting system recovery, system recovery is to factory state, and all of Operation Log is also eliminated；Or

B) part system recovers: start after system recovery, and system recovery is to factory state；All of Operation Log is retained.

Preferably, it is impossible to running simultaneously and remotely control to control with local, long-range control hierarchy is better than local control, and remotely control can control forced termination this locality, and local control can not terminate long-range control.

Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention, and can be practiced according to the content of description, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.

Accompanying drawing explanation

Fig. 1 illustrates frequency spectrum monitoring system schematic diagram according to an embodiment of the invention；

Fig. 2 illustrates spectrum monitoring equipment composition frame chart according to an embodiment of the invention；

Fig. 3 illustrates radio-frequency transmitter block diagram according to an embodiment of the invention；

Fig. 4 illustrates digital processing element block diagram according to an embodiment of the invention；

Fig. 5 illustrates digital filtering schematic diagram according to an embodiment of the invention；

Fig. 6 illustrates the theory diagram of 16384 FFT Frequency Hopping Signals detection according to an embodiment of the invention；

Fig. 7 illustrates the theory diagram of 32768 FFT Frequency Hopping Signals detection according to an embodiment of the invention；

Fig. 8 illustrates quick tuned radio frequency receiver block diagram according to an embodiment of the invention.

Detailed description of the invention

For further setting forth that the present invention reaches technological means and effect that predetermined goal of the invention is taked, below in conjunction with accompanying drawing and preferred embodiment, to single channel its detailed description of the invention of spectrum monitoring equipment proposed according to the present invention, feature and effect thereof, describe in detail as after.In the following description, what different " embodiments " or " embodiment " referred to is not necessarily same embodiment.Additionally, special characteristic in one or more embodiment, structure or feature can be combined by any suitable form.

As it is shown in figure 1, single channel spectrum monitoring equipment is the important component part of frequency spectrum monitoring system, frequency spectrum monitoring system includes n control centre station, m station；Single channel spectrum monitoring equipment is arranged in station as a unit；Whole group network system uses ICP/IP protocol, stands and control centre station utilizes ICP/IP protocol to network.Single channel spectrum monitoring equipment receives the service request from control centre station, and namely single channel spectrum monitoring equipment can as TCP/IP service end, and control centre's station execution can as TCP/IP client.Both application layer communication protocols use RMTP agreement.For the safety of described frequency spectrum monitoring system, can adopting Intranet IP, namely whole frequency spectrum monitoring system is not connected with outer net.

As in figure 2 it is shown, single channel spectrum monitoring equipment includes omnidirectional antenna, radio-frequency transmitter, digital processing element, human-computer interaction module, scheduler module, remote communication module, system recovery module and power supply.

Described omnidirectional antenna, is used for receiving radio-frequency signal.

Described radio-frequency transmitter, for the radio-frequency signal that omnidirectional antenna receives is converted into intermediate-freuqncy signal, and sends digital processing element to.As it is shown on figure 3, a detailed description of the invention according to invention, described radio-frequency transmitter, by double conversion, radiofrequency signal is processed as intermediate-freuqncy signal, antenna is captured signal be filtered, down coversion, amplification.Wherein radiofrequency signal is after preliminary election filtering and low noise amplification, the the first local oscillator signal multiplication produced with the first local oscillator module obtains the first intermediate-freuqncy signal, after described first intermediate-freuqncy signal is amplified via the first intermediate frequency filtering and the first intermediate frequency, the second local oscillation signal produced with the second local oscillator module is multiplied and obtains the second intermediate-freuqncy signal；Described second intermediate-freuqncy signal is sent to digital processing element.

A detailed description of the invention according to invention, by the frequency of the second local oscillation signal that the frequency and the second local oscillator module that arrange the first local oscillation signal that the first local oscillator module produces produce, it is possible to the signal of 30MHz～3GHz frequency range to be converted to the intermediate-freuqncy signal of 76.8MHz (being 70MHz when bandwidth is less than or equal to 500kHz).Meanwhile, radio-frequency transmitter also can generate 102.4MHz sampling clock, carries out A/D sampling for A/D modular converter and this clock signal of digital processing element.

Described human-computer interaction module, is used for providing human-computer interaction function.

Described remote communication module, for communicating with between control centre station or other stations.

Described scheduler module, for differentiating order and result travel direction.According to a specific embodiment of the present invention, described scheduler module is if it is determined that order originates from long-range order, then monitoring result is sent to remote communication module, if order originates from the order of local Man Machine Interface, then send the result to native and connect interactive interface, for instance graphic user interface (GUI).

Described power supply, is used for powering.

Described system recovery module, is used for providing data recovery function.

Described digital processing element, for being monitored frequency spectrum.

A detailed description of the invention according to invention, described digital processing element farther includes Clock management module, A/D modular converter and digital signal processing module.

A detailed description of the invention according to invention, described Clock management module, for receiving reference clock signal from radio-frequency transmitter, and reference clock signal is supplied to A/D modular converter.

A detailed description of the invention according to invention, described A/D modular converter, for the reference clock signal using Clock management module to provide, the intermediate-freuqncy signal that described radio-frequency transmitter provides is converted to digital signal.

A detailed description of the invention according to invention, described digital signal processing module includes Digital Down Convert (DDC) module, digital filtering module, FFT module, frequency detection trigger module, Frequency Hopping Signal measurement module.

Described DDC module, for the intermediate-freuqncy signal of input after A/D changes is multiplied by local carrier, then passes through a low pass filter, namely can obtain orthogonal I, Q two paths of signals after down coversion.Thus can by signal from higher band converted to relatively low frequency band, to reduce digital processing difficulty below.

A detailed description of the invention according to invention, when inputting IF signal frequency f0 and sampling rate fs and meeting f0/fs=(2m+1)/4, the I road of numerically-controlled oscillator (NCO) is output as 1,0,-1,0 these four particular values, Q road is output as 0,1,0 ,-1 these four particular values.As sample rate f s=40MHz, when choosing intermediate frequency f0=30MHz, first every 2, input traffic being asked its negative, namely take the complement code of 2, form a new data stream, then new data stream set to 0 every one, the output stream of gained is exactly the signal after down coversion.

A detailed description of the invention according to invention, after orthogonal digital down coversion, obtains the baseband signal of zero intermediate frequency, and now the sample rate of baseband signal remains A/D sample rate.Owing to the even item on I road after mixing and the odd term on Q road are 0, therefore before filtering, the I after down coversion, Q signal can be carried out odd even extraction: filter again after namely the sampling point for 0 being given up.Be equivalent to sampling rate after extraction and reduce to original half.But I/Q road signal now differs 1/4 sampled point in time domain, this delay inequality is apparently due to have employed caused by odd even extraction, and this temporal " not lining up " adopts two all-pass filters to be corrected for.

Described DDC module, for being filtered the I/Q road signal after orthogonal digital down coversion.According to a specific embodiment of the present invention, after down coversion, although sampling rate fs reduces to original half, but divide into the complex signal that two-way is orthogonal, bandwidth remains as 20MHz, will realize the frequency resolution of finer acquisition bandwidth and Geng Gao, it is necessary to adopt extraction mode to realize.Half-band filter (Half-BandFilter) is adapted for carrying out the extraction of the power side times of N, and computational efficiency is high, real-time.Signal is after every one-level half-band filter extracts, and speed and bandwidth all become original half.When extracting number of times and increasing, analysis bandwidth reduces, but finally carry out counting of FFT to remain unchanged, it is achieved thereby that higher frequency resolution, in addition, owing to symmetry and the nearly half coefficient of half-band filter coefficient are the characteristic of 0 so that the multiplication number of times of filtering operation decreases 3/4 than conventional FIR filter, it is simple to realize.

Described FFT module, for carrying out FFT to filtered I/Q road signal.According to a specific embodiment of the present invention, it is necessary to I/Q road signal to be carried out windowing and frame overlap processing, then carry out FFT time-frequency conversion and complete to trigger.For a M (M is the power of the 2) time-frequency conversion put, if directly calculating DFT (discrete Fourier transform) to need M2 complex multiplication and M* (M-1) secondary complex addition.And FFT (fast Fourier transform) can make operand be substantially reduced, CM that it is required and plural number add and are approximately (M-1) * log₂M time.

According to a specific embodiment of the present invention, it is necessary to the I/Q two paths of signals data rate carrying out FFT is up to 20MHz, adopts the butterfly computation method of base-2.Each butterfly computation is made up of multiplication operation and twice plus and minus calculation.The FFT of M point needs to use log₂M level butterfly computation realizes.Every grade needs M/2 butterfly computation.The butterfly computation of every grade adopts decimation in frequency algorithm.When carrying out the M point data of present frame, the M point data of next frame can be loaded, export the M point data of former frame simultaneously.The butterfly processing element of each base-2 has the memory element of oneself, is used for storing the data of input and intermediate treatment.

Described frequency detection trigger module, is used for detecting Frequency Hopping Signal.According to a specific embodiment of the present invention, extract Time-Frequency Information according to formula (1):

STF (t, f)=∫ R (τ) W (t-τ) exp (-j2 π f τ) d τ (1)

Wherein R (τ) is time-domain received signal, and W (t) is window function.

Wherein, window width is more wide, and corresponding frequency resolution is more high, and corresponding temporal resolution is more low；Otherwise when window width is more narrow, corresponding frequency resolution is more low, and corresponding temporal resolution is more high.Meanwhile, if window selection is wide, although then frequency resolution is more high, but the complexity of computing is also more high.The cycle-skipping of certain echo signal is 62.5 microseconds, and channel spacing bandwidth is about 114Hz, if with this interval bandwidth for FFT frequency interval, then needing the FFT of about 4,000 ten thousand, length is long, the number of samples jumped even more than, does not possess realizability.

For choosing suitable frequency resolution, first need the limiting performance of assessment signal detection.Modulating with MFSK, information rate is the signal of 16kBd is example, intermediate frequency input 720MHz, sample rate 2.88GSps, 180000 sampled points of each cycle-skipping, and the single-tone Frequency Hopping Signal of incoming frequency detection trigger module is:

Wherein A represents signal amplitude,For angular frequency, σ n (t) represents real number noise, obeys N (0, σ²) distribution.SampleLen represents the sampling number of a jumping burst.Owing to being single-tone FSK Frequency Hopping Signal, the burst of each frequency hopping contains only 1 modulation symbol, and SampleLen is the over-sampling rate of this modulation symbol, and signal Eb/N0 is:

$\frac{Eb}{N0}=\frac{A^{2}SampleLen}{4{\mathrm{\σ}}^2{\log }_{2}M}---\left(3\right)$

M represents modulation symbol number of constellation points, for 2FSK, M=2.

If FFT counts as N_fft, with an output energy jumping interior K FFT result with for judgement amount, KN_fft< 180000, the detection limit of each frequency is:

$T\left(f\right)=\{\begin{array}{cc}\underset{k=1}{\overset{K}{\&Sigma;}}|S(f,k)+N(f,k){|}^2& f={\mathrm{\&omega;N}}_{fft},-{\mathrm{\&omega;N}}_{fft}\\ \underset{k=1}{\overset{K}{\&Sigma;}}|N(f,k){|}^2& otherwise\end{array}---\left(4\right)$

According to a specific embodiment of the present invention, frequency detection trigger module farther includes resolution and arranges submodule, for determining frequency and temporal resolution according to a jumping signal modulation rate and persistent period；Detection threshold chooses submodule, for determining detection threshold according to frequency and temporal resolution and target false-alarm probability；Spectra calculation submodule, for calculating the power spectrum of a jumping signal；Frequency hopping detection sub-module, for the relation according to spectrum peak (or the average in one section of bandwidth) Yu detection threshold, it may be judged whether there is Frequency Hopping Signal.

According to a specific embodiment of the present invention, when meeting the following conditions simultaneously, testing result is equivalent to the result of Maximum Likelihood Detection:

A) signal is rectangle shaped signal；

B) FFT counts and counts equal to modulation symbol over-sampling；

C) each FFT is all to homogeneous modulation symbol；

D) signal carrier frequency is directed at certain FFT frequency；

E) FFT stacking fold equal symbol number.

Now whole energy of signal all concentrate on the spectral line of carrier frequency place, leak without other energy, and reach coherent accumulation in modulation symbol level, and detection performance is best.

The frequency number detected when signal demand to be detected is K (K≤N_fft), target false-alarm probability isThen the false-alarm probability of each frequency to be detected is:

$P_{fa}^{po\mathrm{int}}=1-{(1-P_{fa}^{t\arg et})}^{\frac{1}{K}}---\left(5\right)$

The energy supposition making power spectrum be M FFT, it is assumed that the noise on each frequency f is AWGN noise, obeys multiple Gauss distributionThen detection threshold is:

$Thr=\frac{{\mathrm{\&sigma;}}_f^2}{2}chi2inv(1-P_{fa}^{po\mathrm{int}},2M)---\left(6\right)$

To awgn channel, noise in time domain Gaussian distributed N (0, σ²), with the noise variance relation of each frequency after FFT (non-zero frequency) it is:

${\mathrm{\&sigma;}}_f^2=N_{fft}{\mathrm{\&sigma;}}^2---\left(7\right)$

Being analyzed as follows false dismissal probability: the psk signal to rectangle molding, Es/N in time domain₀With signal power (variance) P_sWith noise power (variance) σ²Relation be:

$\frac{E_s}{N_0}=\frac{R_{sample}{P}_s}{2R_{Bd}{\mathrm{\&sigma;}}^2}---\left(8\right)$

Wherein R_sampleRepresent sample rate, R_BdRepresent modulation symbol baud rate.

Assume that signal does not occur symbol to overturn in a FFT, and carrier frequency is just certain FFT standard frequency point frequency, then in this frequency, signal power is:

$P_{s,po\mathrm{int}}=\frac{P_s{N}_{fft}^2}{2}---\left(9\right)$

When each FFT is narrowly focused towards a modulation symbol, when a jumping has M symbol, M FFT energy supposition can be carried out at most.If signal carrier frequency is only present on K standard frequency point, then false dismissal probability is:

$P_m=ncx2cdf(\frac{Thr}{{\mathrm{\&sigma;}}_f^2/2},2M,\frac{{\mathrm{MP}}_{s,po\mathrm{int}}}{{\mathrm{\&sigma;}}_f^2/2})---\left(10\right)$

The Hopping frequencies interval of actual signal is very little, it is believed that carrier frequency is equally distributed between adjacent two FFT frequencies, namely thinks signal detected as long as adjacent two frequency bins has one to exceed thresholding, then false dismissal probability is:

$P_m=\underset{-0.5}{\overset{0.5}{\&Integral;}}ncx2cdf(\frac{Thr}{{\mathrm{\&sigma;}}_f^2/2},2M,\frac{{\mathrm{sinc}}^2\left(f\right){\mathrm{MP}}_{s,po\mathrm{int}}}{{\mathrm{\&sigma;}}_f^2/2})\&CenterDot;ncx2cdf(\frac{Thr}{{\mathrm{\&sigma;}}_f^2/2},2M,\frac{{\mathrm{sinc}}^2(1-|f\left|\right){\mathrm{MP}}_{s,po\mathrm{int}}}{{\mathrm{\&sigma;}}_f^2/2})df---\left(11\right)$

Fig. 6 illustrates the theory diagram of 16384 FFT Frequency Hopping Signal detections, wherein has 64 sub-channels, effective sub-channel 44,256 FFT of every sub-channels.Fig. 7 illustrates the theory diagram of 32768 FFT Frequency Hopping Signal detections, wherein has 64 sub-channels, effective sub-channel 44,512 FFT of every sub-channels.When false alarm rate is set to identical, 32768 FFT4 cumulative thresholdings are higher than 16384: 9 cumulative thresholdings.

Table 1 having illustrated, the deviation 99.9% that each speed loss under two kinds of FFT yardsticks and carrier frequency are estimated is worth (Eb/N0=11dB).From table, the carrier frequency estimated bias of visible 32768 FFT of data is bigger, and loss during low speed worsens more apparent.

Table 1

Table 1 has illustrated the value of each rate bandwidth estimated value 99.8% scope (unit: frequency) Eb/N0=11dB under two kinds of FFT yardsticks.Numerical value from table is it can be seen that to sentence fuzziness at the beginning of the bandwidth of 32768 slightly higher.

Table 2

Described Frequency Hopping Signal measurement module, is used for, when after the triggering signal occurring meeting trigger condition, Frequency Hopping Signal parameter being measured in real time.Described Frequency Hopping Signal parameter includes but not limited to: frequency hopping rate, frequency hopping residence time.According to a specific embodiment of the present invention, peak searching algorithm is used to calculate frequency hopping rate and residence time, search peak signal in the every frame of continuous print, after searching effective peak, point between record peak value appearance, when peak value shifts or do not capture effective peak, records time point again, just can calculate frequency hopping residence time, in like manner can calculate frequency hopping rate.

By the way, it is possible to achieve bandwidth is 20M capturing frequency-hopping signal.When needing the Frequency Hopping Signal catching 1000 jumpings/s (175MHz bandwidth), also need to be further processed.

Jumping/s (175MHz) for Frequency Hopping Signal 1000, namely 1ms frequency hopping is once, if signal duration 900 μ s, need to ensure that acquisition probability is more than 90%, 20MHz bandwidth tuning 9 times can be adopted to cover.

For 20MHz bandwidth, I/Q extracts post-sampling rate by 2.5 times of calculating:

FsIQ=20MHz*2.5=50MHz

Resolution 25kHz, fsIQ/25kHz=2048 point of sampling, sample duration Tsmp about 41 μ s.

Observe some Frequency Hopping Signal in a certain bandwidth, its duration T sg=900 μ s (phase place is any), cycle 1ms.

9 switchings of trapping module, a cycle is T, then fall the sampling period Ts=9*T in a 20MHz bandwidth, then, as long as Ts is less than Tsg, always capture signal.Consider sample duration Tsmp, it is possible at least catch once complete Tsmp, take

Ts=Tsg-Tsmp=818 μ s

Then T=Ts/9=90 μ s, then receiver tuning period

TurnTime=T-Tsmp=50 μ s

Visible, based on can realize tuning period is better than the technology of 50 μ s at present, under the premise that the Analysis of Existence only carrying out Frequency Hopping Signal requires, a passage (receiver tuning is better than 50 μ s) can be used to carry out frequency hopping and to catch, thus reducing equipment cost.

A detailed description of the invention according to invention, described digital processing element farther includes quick tuner module, for rf receiver unit interval on schedule is tuned to different frequency range successively to receive the radio-frequency signal of different frequency range.

The process logical sequence of described digital processing element is as shown in table 1:

The process logical sequence of table 3 digital processing element

Wherein operation time with " order ", " tuning ", " A/D " time parallel, can realize this point in timing Design, such that it is able to be not counted in during sequential takies.

In 175MHz bandwidth, tuning controls module by parallel bus, adopts synchronous control mode to realize 9 tunings of radio-frequency transmitter.Radio-frequency transmitter tunes plus the digital sample retention time every time, less than 70 microseconds.This ensures that there the acquisition probability of 100%.

According to a specific embodiment of the present invention, as shown in Figure 7, quick tuned radio frequency receiver is composed as follows: outside and two local oscillators external in a local oscillator are external, farther including reserved interior local oscillator and External Reference signal, described reserved interior local oscillator is respectively connected to the first frequency mixer and the second frequency mixer by the first phase-locked loop module PLL1 and the second phase-locked loop pll 2；A described local oscillator external reserved interior local oscillator is selected by inside and outside selector when accessing the first frequency mixer；Described two local oscillators external reserved interior local oscillator is selected by inside and outside selector when accessing the second frequency mixer；Thus realizing different frequency tuning.

According to a specific embodiment of the present invention, in reserved, local oscillator is consistent with one, two local oscillator numerical value, and External Reference signal is 50MHz.First intermediate frequency selects 4.3GHz, and the second intermediate frequency selects 76.8MHz.Frequency of heart 2GHz in the signal, during bandwidth 175M, when adopting segmented tuning to be received, every section of bandwidth is 20MHz.Being received as example with centre one segment signal of mid frequency 2GHz, bandwidth 20M, corresponding first local oscillator is 6.3G, and the second local oscillator is 6.3768GHz.The signal center frequency next time tuned is 2.02GHz, and bandwidth is 20MHz, then the first local oscillator is 6.32G, and the second local oscillator is 6.3968GHz.The like, the mid frequency tuned each time increases 20M, and corresponding first local oscillator and the second local oscillator also increase 20M, to realize the tuning of every 20M segmentation.

According to a specific embodiment of the present invention, quick tuner module is used for providing reserved interior local oscillator and External Reference signal, and described reserved interior local oscillator is respectively connected to the first frequency mixer and the second frequency mixer by the first phase-locked loop module PLL1 and the second phase-locked loop pll 2；Described quick tuner module regulates reserved interior local oscillator and External Reference signal successively by inside and outside selector interval on schedule, provides a local oscillation signal and two local oscillation signals to realize different frequency tuning respectively for the first frequency mixer and the second frequency mixer.

According to a specific embodiment of the present invention, the difference according to control mode, process monitoring result respectively；If currently belonging to local control model, pass through Man Machine Interface, for instance graphic user interface GUI shows monitoring result in real time；If current terminology remote controlled manner, then by described remote communication module, monitoring result is mail to control centre station or other stations.

Described Monitoring Data includes, but are not limited to: FFT amplitude spectrum data, I/Q data, the frequency hopping residence time monitored, frequency hopping rate.

According to a specific embodiment of the present invention, it is impossible to running and remotely control to control with local, long-range control hierarchy is better than local control, and remotely control can control forced termination this locality, and local control can not terminate long-range control simultaneously.

According to a specific embodiment of the present invention, only allow a Terminal Server Client accessed by described remote communication module and send control instruction, if there being other Terminal Server Clients to want to access, it is necessary to wait that the Terminal Server Client being currently accessed exits control simultaneously.

According to a specific embodiment of the present invention, after described system recovery module receives system recovery command, lighting system recovers display lamp, start solid-state disk image recovery program, by GHOST mechanism automatically into image recovery, recover rear computer and rebooted into duty, close system recovery display lamp.

According to a specific embodiment of the present invention, system recovery module can carry out the recovery of two ways:

A) total system recovers: start after system recovery, and system recovery is to factory state.All of Operation Log is also eliminated.

B) part system recovers: start after system recovery, and the software rejuvenation of system is to factory state.All of Operation Log is retained.

Being defaulted as and recover with part system reset mode, user can carry out the adjustment of acquiescence reforestation practices according to the actual requirements.

Can effectively reduce user cost by implementing the present invention, improve reliability.For 30M～3G radio-frequency transmitter, single channel cost is about 30,000 yuan, single channel capture card cost is about 0.3 ten thousand, if adopting multichannel frequency spectrum detection scheme, when to catch the Frequency Hopping Signal of 1000 jumpings/s (175MHz bandwidth), the channel parallel work using 9 20MHz bandwidth covers the bandwidth of 175MHz, at least needs 3*9+0.3*9=29.7 ten thousand yuan；And if single channel spectrum monitoring equipment provided by the present invention, then only need 3.3 ten thousand yuan of frequency hoppings that can realize catching 1000 jumpings/s (175MHz bandwidth), save cost and 3*8+0.3*8=26.4 ten thousand yuan altogether.

The above, it it is only presently preferred embodiments of the present invention, not the present invention is done any pro forma restriction, although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention, any those skilled in the art, without departing within the scope of technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or is modified to the Equivalent embodiments of equivalent variations, in every case it is the content without departing from technical solution of the present invention, according to any simple modification that above example is made by the technical spirit of the present invention, equivalent variations and modification, all still fall within the scope of technical solution of the present invention.

Claims (10)

1. a single channel spectrum monitoring equipment, it is characterised in that including: omnidirectional antenna, radio-frequency transmitter, digital processing element, human-computer interaction module, remote communication module and power supply；

Described omnidirectional antenna, is used for receiving radio-frequency signal.

Described radio-frequency transmitter, for the radio-frequency signal that omnidirectional antenna receives is converted into intermediate-freuqncy signal, and sends digital processing element to；

Described digital processing element, for being monitored frequency spectrum；

Described human-computer interaction module, is used for providing human-computer interaction function；

Described remote communication module, for communicating with between control centre station or other stations；

Described power supply, is used for powering.

2. single channel spectrum monitoring equipment according to claim 1, it is characterised in that:

Described digital processing element farther includes Clock management module, A/D modular converter and digital signal processing module；

Described Clock management module, for receiving reference clock signal from radio-frequency transmitter, and is supplied to A/D modular converter by reference clock signal；

Described A/D modular converter, for the reference clock signal using Clock management module to provide, is converted to digital signal by the intermediate-freuqncy signal that described radio-frequency transmitter provides.

3. single channel spectrum monitoring equipment according to claim 1 and 2, it is characterised in that:

Described digital signal processing module farther includes Digital Down Convert (DDC) module, digital filtering module, FFT module, frequency detection trigger module and Frequency Hopping Signal measurement module；

Described DDC module, for the intermediate-freuqncy signal of input after A/D changes is multiplied by local carrier, then passes through a low pass filter, obtains orthogonal I, Q two paths of signals after down coversion；

Wherein, described input IF signal frequency f0 and sampling rate fs meets f0/fs=(2m+1)/4；Every 2, input traffic being asked its negative, namely takes the complement code of 2, form a new data stream, then new data stream set to 0 every one, the output stream of gained is exactly the signal after down coversion；

After orthogonal digital down coversion, obtain the baseband signal of zero intermediate frequency, the I after down coversion, Q signal are carried out odd even extraction, filters again after the sampling point for 0 is given up；Adopt all-pass filter to correct I/Q road signal in time domain, differ 1/4 sampled point；I/Q road signal after orthogonal digital down coversion is filtered；

Described FFT module, for carrying out FFT to filtered I/Q road signal；

Described frequency detection trigger module, is used for detecting Frequency Hopping Signal；

Described Frequency Hopping Signal measurement module, is used for, when after the triggering signal occurring meeting trigger condition, Frequency Hopping Signal parameter being measured in real time；Described Frequency Hopping Signal parameter includes but not limited to: frequency hopping rate, frequency hopping residence time.

4. according to the arbitrary described single channel spectrum monitoring equipment of claim 1-3, it is characterised in that:

Described radio-frequency transmitter, is processed radiofrequency signal as intermediate-freuqncy signal by double conversion, antenna is captured signal be filtered, down coversion, amplification.Wherein radiofrequency signal is after preliminary election filtering and low noise amplification, the the first local oscillator signal multiplication produced with the first local oscillator module obtains the first intermediate-freuqncy signal, after described first intermediate-freuqncy signal is amplified via the first intermediate frequency filtering and the first intermediate frequency, the second local oscillation signal produced with the second local oscillator module is multiplied and obtains the second intermediate-freuqncy signal；Described second intermediate-freuqncy signal is sent to digital processing element；

Radio-frequency transmitter is used for generating sampling clock, carries out A/D sampling for A/D modular converter and this clock signal of digital processing element.

5. according to the arbitrary described single channel spectrum monitoring equipment of claim 1-4, it is characterised in that:

Described digital processing element farther includes quick tuner module, for rf receiver unit interval on schedule is tuned to different frequency range successively to receive the radio-frequency signal of different frequency range.

6. according to the arbitrary described single channel spectrum monitoring equipment of claim 1-5, it is characterised in that:

Quick tuner module is used for providing reserved interior local oscillator and External Reference signal, and described reserved interior local oscillator is respectively connected to the first frequency mixer and the second frequency mixer by the first phase-locked loop module PLL1 and the second phase-locked loop pll 2；

Described quick tuner module regulates reserved interior local oscillator and External Reference signal successively by inside and outside selector interval on schedule, provides a local oscillation signal and two local oscillation signals to realize different frequency tuning respectively for the first frequency mixer and the second frequency mixer.

7. according to the arbitrary described single channel spectrum monitoring equipment of claim 1-6, it is characterised in that:

Described Frequency Hopping Signal measurement module uses peak searching algorithm to calculate frequency hopping rate and residence time, search peak signal in the every frame of continuous print, after searching effective peak, the time point that record peak value occurs, when peak value shifts or does not capture effective peak, again record time point, calculate frequency hopping residence time and frequency hopping rate.

8. according to the arbitrary described single channel spectrum monitoring equipment of claim 1-7, it is characterised in that:

Described single channel spectrum monitoring equipment farther includes scheduler module, for order and result travel direction are differentiated；

Monitoring result if it is determined that order originates from long-range order, is then sent to remote communication module by described scheduler module, if order originates from the order of local Man Machine Interface, then sends the result to native and connects interactive interface.

9. according to the arbitrary described single channel spectrum monitoring equipment of claim 1-8, it is characterised in that:

Described single channel spectrum monitoring equipment farther includes system recovery module, is used for providing data recovery function；

Described system recovery module is recovered in two ways:

A) total system recovers: after starting system recovery, system recovery is to factory state, and all of Operation Log is also eliminated；Or

B) part system recovers: start after system recovery, and system recovery is to factory state；All of Operation Log is retained.

10. the single channel spectrum monitoring equipment according to claim 1-9, it is characterised in that:

Can not running simultaneously remotely control and local control, long-range control hierarchy is better than local control, remotely controls to control forced termination this locality, and this locality controls to terminate long-range control.