CN106788475B - Short wavelength regions emergency mobile communicates half-blindness frequency-selective system and its method - Google Patents
Short wavelength regions emergency mobile communicates half-blindness frequency-selective system and its method Download PDFInfo
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The present invention provides a kind of short wavelength regions emergency mobile communication half-blindness frequency-selective system and its methods, the angle blended from detection communication, comprehensively utilize broadband passive monitoring and low signal-to-noise ratio Detection Techniques, the priori scan frequency being primarily based in the passive monitoring acquisition best effort frequency range of full frequency band, the electromagnetic pollution for avoiding full band scan from introducing provides basis to carry out bi-directional probing using existing narrowband short-wave radio set；And then it is based on Portable Short radio station actively perceive priori frequency, it realizes that frequency is preferred, solves the problems, such as that the existing communication efficiency of high-power standalone probe is low, concealment is poor, short wavelength regions emergency mobile communication under complex environment is significant to being promoted.
Description
Technical field
The present invention relates to short wave communication frequency predication technical fields, and in particular to a kind of short wavelength regions emergency mobile communication half
Blind frequency-selective system and its method.
Background technique
China be a natural disaster take place frequently, multiple country, the disasters such as earthquake, big flood happen occasionally, and give national economy
Very big loss is caused with people's lives and properties.Emergency communication is to support prevention preparation, monitoring and warning, disposition rescue, restoration and reconstruction
The important leverage that the links of equal contingency managements are fast, efficient, safe, reliably operate.As a kind of important region emergency
Mobile communication means, the nearly vertical incidence sky wave of shortwave (Near Vertical Incidence Skywave, NVIS) communication can be with
It is not limited by orographic condition, realizes the non-blind area all standing of complex topographic territory 300km range.In high mountain gorge, jungle gully
Area, since the means such as satellite communication, ultra short wave communication are limited by factors such as electric wave line-of-sight propagation, poor weather environment,
Shortwave NVIS communicates specific over-the-horizon propagation characteristic and motor-driven portable capability, becomes and unique a kind of meets complicated landform
The emergency mobile means of communication that the non-blind area all standing of senior middle school low latitude needs in 300km regional scope.
Short wave communication frequency range is located at 3-30MHz, and shortwave NVIS sky wave is a kind of propagation using the high elevation angle (nearly 90 °) antenna
Mode (as shown in Figure 1), needs in Ionospheric F2Layer critical frequency (f0F2) work below, it otherwise will penetrate ionosphere, Bu Nengda
At communication.Ionospheric critical frequency f0F2It is directly related with magnetic storm, absorption, solar activity, latitude, sky climatic environment etc., with season
Dynamic change when section, month, day.Therefore, in order to adapt to NVIS channel time-varying dispersion characteristics, shortwave NVIS communication must solve to lead to
Believe that the choice of dynamical problem of frequency, reliability, timeliness and the mobility of frequency-selecting are always to restrict shortwave NVIS mobile communication hair
One of bottleneck problem of exhibition.
Currently, the frequency planning of shortwave NVIS communication mainly uses ionospheric vertical sounding instrument to obtain critical frequency,
The forecast of short wave communication frequency is realized on the basis of this.Ionospheric vertical sounding instrument vertically upward tranmitting frequency change over time it is wireless
Electric pulse receives the ionospheric echo of these pulses in same place, the round-trip delivery lag of electric wave is measured, to obtain
Obtain relation curve, that is, Ionogram of reflection height and frequency.Thus E, F1, F2 and Es layers of critical frequency and most is obtained
The ionospheres characteristic parameters such as small frequency, each layer virtual height, by it is appropriate conversion can also be obtained from ionogram inverting electron density with
The distribution situation of height.
The 22nd Reserch Institute Of China Electronics Technology Group Corporation is the main research institute of ionospheric vertical sounding instrument, and within the scope of territory in succession
19 fixed detection sites are deployed, 24 hours continuous probes are carried out on entire short-wave band (3-30MHz).Detection site hair
It penetrates power and is typically larger than 400 watts, some is even as high as 1000 watts, to obtain reliable ionospheric critical frequency and other parameters.
After obtaining current ionospheric critical frequency, available frequency is usually provided at equal intervals within the scope of 2MHz under the critical frequency
Forecast.Since detection system is mutually indepedent with communication system, so there is no pass through for this forecast frequency for dividing acquisition at equal intervals
Actual ionospheric channel test is crossed, forecasts that the availability of frequency is insufficient.
On the other hand, since existing detection site is built upon greatly the more flourishing large- and-medium size cities of traffic, outlying district
Ionospheric probing prediction ability is insufficient.For the needs for meeting outlying mountain area's emergency short wave communication construction, radio wave propagation is ground in recent years
Study carefully etc. more units have developed vehicle-carrying motor type shortwave ionospheric vertical sounding equipment in succession.But the transmission power of equipment is big
All at 400 watts or more, in the case where the complicated landforms environmental energy such as outlying mountain area feeds limited situation, this kind of active probe equipment
Using strictly limited.
For this purpose, radio wave propagation research institute has further developed the passive detection born suitable for individual soldier recently
Equipment is forecast with being suitable for the ionosphere frequency sonding of complex topographic territory.The main thought of passive detection is by radio wave propagation
As the beacon station, portable ionospheric detection equipment only needs tens detection sites that research institute constructs in China
The detectable signal that each beacon station is sent is received, the ionospheric propagation characteristic far from beacon station region is obtained by interpolation fitting
Parameter.It is mobility, hidden as it can be seen that this passive detection method, casts aside emitting portion and be greatly reduced equipment volume power consumption etc.
Property greatly enhances.But this NVIS frequencies of propagation estimated by numerical fitting, is limited to the precision of algorithm itself, believes in beacon
Breath is difficult to region (land border, off-lying sea islands and reefs) the performance degradation covered.
Short frequency detection system is mutually isolated with communication system for a long time, either active probe method or passive
Detection method, using signal waveform, transceiver and the antenna equipment for being different from communication system.This results in detection system pre-
The communication frequency of report is poor for applicability in existing communication system, can passband it is low.In addition, active probe method that there is also power is big,
The serious problems such as the poor, electromagnetic environmental pollution of mobility；There is also reliabilities that low, link is covered with blind area for passive detection method
Problem.
Summary of the invention
The application communicates half-blindness frequency-selective system and its method by providing a kind of short wavelength regions emergency mobile, realizes that detection is logical
The integration of letter combines active probe with passive detection, because of short frequency detection system and is led in the prior art with solution
Caused by letter system is mutually isolated detection system forecast communication frequency it is poor for applicability in a communications system, can the low skill of passband
The problem of art problem and active probe method power are big, mobility is poor, electromagnetic environmental pollution, passive detection method reliability
The problem of low, link is covered with blind area.
In order to solve the above technical problems, the application is achieved using following technical scheme：
A kind of short wavelength regions emergency mobile communicate half-blindness frequency-selective system, including short-wave radio set, broadband short-wave reception module with
And message processing module, wherein the message processing module includes that passive monitoring obtains priori scan frequency unit, active probe
Frequency preferred cell, spectrum management unit, database management unit, ITS propagation model and channel access module, wherein institute
Stating broadband short-wave reception module, by USB interface to connect progress shortwave with the passive monitoring acquisition priori scan frequency unit complete
Band scan, the passive monitoring obtain the highest available frequency that priori scan frequency unit is provided according to the ITS propagation model
Threshold value is arranged in rate MUF and lowest usable frequency LUF, described to reject bursty interference and close on the strong signal interference of the station
Passive monitoring obtains priori scan frequency unit and is based on broader frequency spectrum monitoring acquisition priori scan frequency, the channel access module
It is connect with the short-wave radio set, the active probe frequency preferred cell actively perceive priori scan frequency, completes the double of channel
To detection, the priori scan frequency that the active probe frequency preferred cell perceives is ranked up simultaneously by the spectrum management unit
It stores to the database management unit, the short-wave radio set and the broadband short-wave reception module and is shared by notch diplexer
Antenna.
Further, the message processing module is terminal.
It further, further include human-computer interaction interface.
A kind of frequency-selecting method of short wavelength regions emergency mobile communication half-blindness frequency-selective system, includes the following steps：
S1：It is monitored based on broader frequency spectrum and obtains priori scan frequency, specifically comprised the following steps：
S11：Short-wave all-frequency band is scanned using broadband short-wave receiver, records the interference energy on each scanning frequency point
Magnitude；
S12：According to the graph of relation of the man-made noise median coefficient provided and frequency in CCIR258-2 report, to dry
It disturbs energy value to be modified, to filter out man-made noise influence；
S13：It is with the maximum usable frequency MUF and lowest usable frequency LUF that Institute for Telecommunication Science's ITS propagation model provides
Threshold value is arranged in foundation, to reject bursty interference and close on the strong signal interference of the station；
S14：Reflection kernel frequency values are calculated,In formula, FiFor i-th of frequency, D (Fi) be
FiSpectral energy values, i=1,2 ..., N；
S15：Taking (RCF-1.5, RCF+1.5) is NVIS best effort window；
S16：Frequency monitoring module exports the unoccupied frequency point in (RCF-1.5, RCF+1.5), as priori scan frequency
Collection；
S2：Short-wave radio set is based on the low-power bi-directional probing actively perceive characteristic of channel, chooses current optimal frequency.
Further, in step S2 using adaptive multi-carrier DFSK differential frequency shift keying ADMFSK as detection waveform, into
Row ADMFSK is provided with synchronous carrier wave when modulating, and carries out forward error correction by RS code.
Further, detection waveform only has that single-frequency and signal phase be continuous, constant amplitude at any time.
Further, carrier wave repeats to send default PN code by keying mode, realizes that information adds by the default PN code of difference
It is close.
Compared with prior art, technical solution provided by the present application, the technical effect or advantage having are：The invention provides
Short wavelength regions emergency mobile communication half-blindness frequency-selective system by detection communication depth integration, would be more suitable for complicated landform
The maneuver detecting in ionosphere under environment solves the technology that communication efficiency existing for high-power standalone probe is low, concealment is poor and asks
Topic has important meaning to short wavelength regions emergency mobile communication under complex environment is promoted.
Detailed description of the invention
Fig. 1 is that shortwave NVIS propagates schematic diagram；
Fig. 2 is that short wavelength regions emergency mobile communicates half-blindness frequency-selective system structural block diagram；
Fig. 3 is the ICF measured drawing monitored based on broader frequency spectrum；
Fig. 4 is short-wave all-frequency band real time spectrum figure；
Fig. 5 is frequency sonding waveform configuration schematic diagram；
Fig. 6 is ADMFSK modulation scheme schematic diagram；
Fig. 7 is half-blindness frequency-selective system working timing figure.
Specific embodiment
The embodiment of the present application communicates half-blindness frequency-selective system and its method by providing a kind of short wavelength regions emergency mobile, realizes
The integration for detecting communication, active probe is combined with passive detection, to solve to be because short frequency detects in the prior art
System with communication system mutually isolate caused by detection system forecast communication frequency it is poor for applicability in a communications system, can passband
The problem of low technical problem and active probe method power is big, mobility is poor, electromagnetic environmental pollution, passive detection method
The problem of reliability is low, link is covered with blind area.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments, it is right
Above-mentioned technical proposal is described in detail.
Embodiment
A kind of short wavelength regions emergency mobile communication half-blindness frequency-selective system, as shown in Fig. 2, including short-wave radio set, broadband shortwave
Receiving module and message processing module, wherein the message processing module includes that passive monitoring obtains priori scan frequency list
Member, active probe frequency preferred cell, spectrum management unit, database management unit, ITS propagation model and channel access mould
Block, wherein the broadband short-wave reception module obtains priori scan frequency unit with the passive monitoring by USB interface and connect
Short-wave all-frequency band scanning is carried out, the passive monitoring obtains what priori scan frequency unit was provided according to the ITS propagation model
Threshold value is arranged in maximum usable frequency MUF and lowest usable frequency LUF, with the strong signal rejected bursty interference He close on the station
Interference, the passive monitoring obtain priori scan frequency unit and are based on broader frequency spectrum monitoring acquisition priori scan frequency, the letter
Road AM access module is connect with the short-wave radio set, the active probe frequency preferred cell actively perceive priori scan frequency, complete
At the bi-directional probing of channel, priori scan frequency that the spectrum management unit perceives the active probe frequency preferred cell
It is ranked up and stores to the database management unit, the short-wave radio set and the broadband short-wave reception module pass through antenna
Duplexer common antenna.
The message processing module is terminal
Wherein, active probe frequency preferred cell relies on existing short-wave radio set transceiver and antenna completely, and base band
The modulation /demodulation of signal is realized in a software form completely.In addition, there is no broadband reception function in view of existing short-wave radio set, therefore match
Broadband short-wave receiver is set, terminal is accessed by USB port, realizes the calculating of priori scan frequency.
Since frequency detection systems have bigger sweep bandwidth and peak power compared with Shortwave Communication System, communication is relied on
System, which carries out frequency sonding forecast, must just solve the problems, such as narrowband, low-power consumption frequency sonding, for this purpose, the invention also provides one kind
Short wavelength regions emergency mobile communicates the frequency-selecting method of half-blindness frequency-selective system, realizes that shortwave NVIS is logical with relatively narrow frequency band and low-power
Believe frequency-selecting, includes the following steps：
S1：It is monitored based on broader frequency spectrum and obtains priori scan frequency；
S2：Short-wave radio set is based on the low-power bi-directional probing actively perceive characteristic of channel, chooses current optimal frequency.
Step S1 and S2 are described in detail below：
S1：It is monitored based on broader frequency spectrum and obtains priori scan frequency
Since the national shortwave that radio wave propagation research institute is responsible for construction detects the station, emit signal waveform not to granddad
It opens, other units can not develop ionosphere passive detection system.For this purpose, the present invention goes out from short wave bandwidth spectrum monitoring
Hair, using the received local short-wave signal of full frequency band, in real time where calculating local zone ionospheric echo center of energy
Frequency point, referred to as reflection kernel frequency (Reflection center frequency, RCF).Reflection kernel frequency is directly anti-
The optimum frequency point that current ionosphere NVIS is propagated has been reflected, has been the optimum frequency band that can determine that work at present as center.So
And short wave communication is also closely related with channel disturbance noise, ionosphere has dynamic time-varying characteristics in a short time in addition, and to reach can
The communication leaned on, it is necessary to which in best effort frequency range, analysis captures frequency spectrum cavity-pocket, is screened by tranquillization channel, to obtain priori
Scan frequency realizes that frequency is preferred.
With the progress of software and radio technique, short wave communication field has had developed practical full frequency band software and has connect at present
Receipts machine can record entire shortwave 30MHz frequency range in real time, this is just provided for calculating shortwave NVIS reflection kernel frequency in real time can
Energy.For the broadband the G31DDC short-wave receiver having been widely used at present, A/D sampler is direct with the sample frequency of 100M
Digitized processing is carried out to signal in radio-frequency head, according to Nyquist sampling theorem, it can be achieved that (can expand short-wave all-frequency band frequency spectrum
It opens up to the real-time monitoring of 50MHz) occupancy situation, this is also feasible in realization.In order to obtain more detailed a certain frequency
The spectrum occupancy of section, can carry out again Digital Down Convert processing for sampled signal, at the digital intermediate frequency signal filtering of output
After reason, adding window and FFT calculation process are carried out again, can obtain the detailed spectrogram within the scope of 20K~2M different bandwidth.Work as observation
When window bandwidth is 20KHz, highest resolution can reach 1Hz.
The present invention is proved by a large number of experiments, and the ionospheric reflection centre frequency RCF obtained is monitored based on short-wave all-frequency band
(document having be referred to as interfere gravity frequency), can Efficient Characterization shortwave NVIS propagation characteristic, that thus estimates present period can
There is good operability and higher precision of prediction with frequency.
Its concrete operation step is：
S11：Short-wave all-frequency band is scanned using broadband short-wave receiver, records the interference energy on each scanning frequency point
Magnitude；
S12：According to the graph of relation of the man-made noise median coefficient provided and frequency in CCIR258-2 report, to dry
It disturbs energy value to be modified, to filter out man-made noise influence；
S13：It is with the maximum usable frequency MUF and lowest usable frequency LUF that Institute for Telecommunication Science's ITS propagation model provides
Threshold value is arranged in foundation, to reject bursty interference and close on the strong signal interference of the station；
S14：Reflection kernel frequency values are calculated,In formula, FiFor i-th of frequency, D (Fi) be
FiSpectral energy values, i=1,2 ..., N；
S15：Taking (RCF-1.5, RCF+1.5) is NVIS best effort window；
S16：Frequency monitoring module exports the unoccupied frequency point in (RCF-1.5, RCF+1.5), as priori scan frequency
Collection；
Fig. 3 is the Chongqing region ICF measured data figure obtained by this method, the reality of the data and Chongqing region acquisition station
Survey the communication frequency goodness of fit with higher.Shown by the road test on the ground such as Chongqing-Beijing, Chongqing-Wuhan：This method obtains
The optimized frequency taken can make when being applied to specially to route communication efficiency be improved significantly.Fig. 4 is captured using the invention
Full frequency band spectrogram can easily obtain current frequency spectrum cavity-pocket position using the daemon software that visual c++ is developed, and
Communication frequency is adjusted in real time.
S2：Short-wave radio set is based on the low-power bi-directional probing actively perceive characteristic of channel, chooses current optimal frequency.
In order to carry out frequency spectrum perception using existing Portable Short signal equipment, to obtain the reality of above-mentioned priori NVIS channel
Border propagation characteristic (including two-way signal-to-noise ratio, frequency deviation, delay spread etc.), just must be with narrow band channel, low power mode working copy
Invention as detection waveform, carries out forward error correction by RS code using adaptive multi-carrier DFSK differential frequency shift keying (ADMFSK), with
Lower character rate exchanges the harsh work that low-power NVIS communicates the low signal-to-noise ratio (- 20dB), high multipath-interference (8ms) that face for
Make condition.This multicarrier serial differential technology is especially suitable for highly maneuvering targets such as helicopter, unmanned planes, and specific implementation is as schemed
Shown in 5.
Due to the rapid fading of the low signal-to-noise ratio and motor-driven NVIS channel of application environment, when carrying out ADMFSK modulation,
The synchronous carrier wave of special setting (f in such as Fig. 60It is shown).On the one hand, which repeats to send preset PN by way of keying
Then code is carried out the detection of self correlated peak by receiving end, realizes the group synchronization of data, on the other hand, the carrier wave that will be received
Reference frequency of the frequency as other carrier waves, to reduce whole frequency deviation bring error in transmission process.Black in Fig. 6 adds
Thick line segment expression has tone signal transmission in the corresponding frequency band of the period, it is assumed that has N number of frequency point to be used for the biography of signal
It is defeated, then wherein the smallest frequency point f0It is used to transmission carrier wave and synchronization signal, f1~fN-1It is noticeable for transmitting data
It is, when only data are 0 on carrier wave again, f1~fN-1Upper just to carry out data transmission, although this design sacrifices transmission speed
Rate, but also avoid inter-carrier interference simultaneously, while the transmission of fundamental wave and synchronic PN code is carried out using individual frequency point, then most
The synchronous access of signal is preferentially ensured to limits, further, it is also possible to realize by different default PN codes a degree of
Information encryption, while using the autocorrelation performance of PN code, it can be quickly accessed with the realization of simple self correlated peak, using of short duration
Good sub-channel environment or interference gap carry out the transmission of payload.
Detection waveform only has that single-frequency and signal phase be continuous, amplitude is kept constant at any time, that is to say, that
Entire transmission process peak-to-average force ratio remains lower steady state, can guarantee waveform do not distort (extension) in the case where,
The efficiency of the long hair number of delivering letters is proposed as far as possible, this individual soldier, bicycle for being limited for power under adverse circumstances with antenna efficiency etc. is motor-driven
User has great Practical significance.
Since Portable Short radio station is compared with the ionospheric vertical sounding small 20dB or more of instrument transmission power, this requires the present invention
The detection waveform that the half-blindness frequency-selecting method of proposition uses can under -20dB noise background reliably working.In addition NVIS propagation is deposited
Strong multidiameter delay, the present invention exchanges low signal-to-noise ratio ability to work for longer symbol width both low rate.It considers simultaneously
Radio station channel switching time, antenna tuning time and radio station continue the factors such as emissivities, and Reference ionosphere sounder is logical
The scan period of normal half an hour, half-blindness frequency-selecting method proposed by the present invention is in 1 hour to 30 in 3MHz best effort frequency range
A priori frequency carries out actively perceive, i.e., completes within every 2 minutes the bi-directional probing of a channel.The continuous probe when completion 24 is small
When, it can get 30 channels on each period, amount to the ordering scenario of 720 channel actual propagation characteristics.
Although channel-aware and passive two modules of monitoring share common antenna, the hardware channel equipment used is mutually only
Vertical, this is just that two aspects of channel-aware and passive frequency selective work at the same time and provide possibility.For this purpose, central station can utilize electricity
While platform carries out priori frequency active probe, the real-time calculating of priori frequency set can also be realized by Improving Working Timing design,
As long as by priori scan frequency by other means (such as Beidou short message), inform in real time motor-driven user can be realized it is long-term not between
Disconnected detection, system working sequence are as shown in Figure 7.
In above-described embodiment of the application, by provide a kind of short wavelength regions emergency mobile communicate half-blindness frequency-selective system and its
Method, the angle blended from detection communication, the monitoring of comprehensive utilization broadband passive and low signal-to-noise ratio Detection Techniques, are primarily based on complete
The passive monitoring of frequency range obtains the priori scan frequency in best effort frequency range, and the electromagnetic pollution for avoiding full band scan from introducing is
Bi-directional probing is carried out using existing narrowband short-wave radio set, and basis is provided；And then based on Portable Short radio station actively perceive priori frequency
Rate realizes that frequency is preferred, solves the problems, such as that the existing communication efficiency of high-power standalone probe is low, concealment is poor, complicated to being promoted
The communication of short wavelength regions emergency mobile is significant under environment.
It should be pointed out that the above description is not a limitation of the present invention, the present invention is also not limited to the example above,
Variation, modification, addition or the replacement that those skilled in the art are made within the essential scope of the present invention, are also answered
It belongs to the scope of protection of the present invention.
Claims (7)
1. a kind of short wavelength regions emergency mobile communicates half-blindness frequency-selective system, which is characterized in that connect including short-wave radio set, broadband shortwave
Receive module and message processing module, wherein the message processing module include passive monitoring acquisition priori scan frequency unit,
Active probe frequency preferred cell, spectrum management unit, database management unit, ITS propagation model and channel access module,
Wherein, the broadband short-wave reception module by USB interface and the passive monitoring obtain priori scan frequency unit connect into
The scanning of row short-wave all-frequency band, the passive monitoring obtain priori scan frequency unit and are provided most according to the ITS propagation model
Threshold value is arranged in High Availabitity frequency MUF and lowest usable frequency LUF, is done with rejecting bursty interference and closing on the strong signal of the station
It disturbs, the passive monitoring obtains priori scan frequency unit and is based on broader frequency spectrum monitoring acquisition priori scan frequency, the channel
AM access module is connect with the short-wave radio set, the active probe frequency preferred cell actively perceive priori scan frequency, is completed
The bi-directional probing of channel, the priori scan frequency that the spectrum management unit perceives the active probe frequency preferred cell into
Row sorts and stores to the database management unit, the short-wave radio set and the broadband short-wave reception module total by antenna
With device common antenna.
2. short wavelength regions emergency mobile according to claim 1 communicates half-blindness frequency-selective system, which is characterized in that the information
Processing module is terminal.
3. short wavelength regions emergency mobile according to claim 2 communicates half-blindness frequency-selective system, which is characterized in that further include people
Machine interactive interface.
4. the frequency-selecting method of short wavelength regions emergency mobile communication half-blindness frequency-selective system as described in claim 1, which is characterized in that
Include the following steps：
S1：It is monitored based on broader frequency spectrum and obtains priori scan frequency, specifically comprised the following steps：
S11：Short-wave all-frequency band is scanned using broadband short-wave receiver, records the interfering energy on each scanning frequency point
Value；
S12：According to the graph of relation of man-made noise median coefficient and frequency, interference energy value is modified, to filter out people
For influence of noise；
S13：With Institute for Telecommunication Science's ITS propagation model provide maximum usable frequency MUF and lowest usable frequency LUF be according to
According to setting threshold value, to reject bursty interference and close on the strong signal interference of the station；
S14：Reflection kernel frequency values are calculated,In formula, FiFor i-th of frequency, D (Fi) it is Fi's
Spectral energy values, i=1,2 ..., N, N are positive integer；
S15：Taking (RCF-1.5, RCF+1.5) is NVIS best effort window；
S16：Frequency monitoring module exports the unoccupied frequency point in (RCF-1.5, RCF+1.5), as priori scan frequency collection；
S2：Short-wave radio set is based on the low-power bi-directional probing actively perceive characteristic of channel, chooses current optimal frequency.
5. the frequency-selecting method of short wavelength regions emergency mobile communication half-blindness frequency-selective system according to claim 4, feature exist
In using adaptive multi-carrier DFSK differential frequency shift keying ADMFSK as detection waveform in step S2, when carrying out ADMFSK modulation
It is provided with synchronous carrier wave, forward error correction is carried out by RS code.
6. the frequency-selecting method of short wavelength regions emergency mobile communication half-blindness frequency-selective system according to claim 5, feature exist
There was only that single-frequency and signal phase be continuous, constant amplitude at any time in, detection waveform.
7. the frequency-selecting method of short wavelength regions emergency mobile communication half-blindness frequency-selective system according to claim 4, feature exist
In carrier wave repeats to send default PN code by keying mode, realizes information encryption by the default PN code of difference.
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| CN110913484B (en) * | 2019-10-19 | 2022-03-18 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | Short wave interference resource application planning method based on environment assistance |
| CN111650956B (en) * | 2020-08-04 | 2020-12-08 | 北京机电工程研究所 | Unmanned aerial vehicle control method for target continuous observation |
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| CN103698743A (en) * | 2013-12-13 | 2014-04-02 | 国家无线电监测中心 | Ionospheric-reflection-based time difference of arrival positioning method for shortwave radiation source |
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