CN102158251A - Capturing method and device for frequency hopping spread spectrum communication system based on folding sampling - Google Patents
Capturing method and device for frequency hopping spread spectrum communication system based on folding sampling Download PDFInfo
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- CN102158251A CN102158251A CN201110054099XA CN201110054099A CN102158251A CN 102158251 A CN102158251 A CN 102158251A CN 201110054099X A CN201110054099X A CN 201110054099XA CN 201110054099 A CN201110054099 A CN 201110054099A CN 102158251 A CN102158251 A CN 102158251A
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Abstract
The invention relates to a frequency hopping spread spectrum fast capturing method based on folding sampling, which belongs to the technical field of communication. The method comprises the following steps: setting a frequency generator, and enabling signals after frequency mixing to pass through a medium frequency broad band filter and an A/D (analog/digital) converter to perform the folding sampling so as to get digital wide frequency signals; performing rough capturing on the digital wide frequency signals, and generating a start signal for fine capturing according to the result of the rough capturing; setting a frequency generator, enabling the signals after the frequency mixing to pass through a medium frequency narrow band filter and the A/D converter to sample so as to get digital fixed medium frequency signals; performing the fine capturing on the digital fixed medium frequency signals, and generating the start signal for the rough capturing if the fine capturing is unsuccessful; and enabling the frequency generator to output a carrier at a normal hop rate after the fine capturing is successful. The invention further relates to a frequency hopping spread spectrum fast capturing device based on the folding sampling. By adopting the method and the system, the capturing speed is improved by reducing frequency points to be searched, thereby verifying and reducing false alarm probability, and realizing the fast and reliable capturing of the frequency hopping spread spectrum system.
Description
Technical field
The present invention relates to a kind of frequency hopping spread spectrum (FHSS) communication system catching method and device, belong to communication technical field.
Background technology
The frequency hopping spread spectrum (FHSS) communication technological incorporation straight expansion and two kinds of spread spectrum technics of frequency hopping, have low probability of intercept and low probability of interference, simultaneously effectively advantages such as opposing multipath effect and near-far interference have obtained extensive use in military and civilian communication.The prerequisite of jumping the spread spectrum system communication work is the synchronous of receiving-transmitting sides, comprises the synchronous and frequency hopping Frequency Synchronization of straight expansion pseudo-code.Contain synchronously and catch and follow the tracks of two processes, the former is synchronously thick, promptly receives and dispatches pseudo-code error in a chip, and both frequency hopping patterns and jumping moment are synchronous; It then is synchronously thin following the tracks of, and makes both sides' pseudo-code clock and frequency hopping frequency generator synchronous fully.Synchronous speed, the speed of especially catching directly influences systematic function.
Existing jumping spread spectrum system capture technique is combined by frequency scanning harvesting policy and acquiring pseudo code strategy usually, wherein frequency scanning has two kinds of linear scan and parallel captures, former structure is simple, but capture time is longer, latter's acquisition speed is fast, but the physical resource that consumes is huger, especially when frequency more for a long time resource correspondingly be multiplied.
Summary of the invention
The objective of the invention is to:, provide a kind of catching method and device based on folding sampling in order to solve the problem that frequency hopping spread spectrum (FHSS) communication system exists synchronously.Adopt method of the present invention, under the condition that does not significantly increase hardware resource, can effectively shorten capture time.
According to an aspect of the present invention, provide a kind of frequency hopping spread spectrum (FHSS) communication system catching method, can comprise based on folding sampling:
Frequency generator is set, and the signal after the mixing is by the intermediate frequency broadband filter, and A/D converter folds sampling and obtains digital broadband signal;
Described digital broadband signal is slightly caught, produce the enabling signal of carefully catching according to the result;
Frequency generator is set, and signal is through the intermediate frequency narrow band filter after the mixing, and the A/D converter sampling obtains digital fixed intermediate frequency signal; And
Described digital fixed intermediate frequency signal is carefully caught, produce the enabling signal of slightly catching.carefully catch finish after, frequency generator is exported the carrier wave of normal hop rate.
According to another aspect of the present invention, the present invention also provides a kind of acquisition equipment that is used for frequency hopping spread spectrum (FHSS) communication system, can comprise:
Radio-frequency filter, frequency mixer, frequency generator, Synchronization Control, the intermediate frequency broadband filter, the intermediate frequency narrow band filter, A/D converter, Digital Down Convert, digital controlled oscillator, correlation detects, and slightly catches and carefully catches;
Described radio-frequency filter carries out filtering to the jumping spread spectrum radio frequency signal that receives, and bandwidth is the whole frequency hopping radio frequency bandwidth of work;
Described frequency mixer, the local carrier that input signal and described frequency synthesizer are produced carries out mixing;
Described frequency generator generates local carrier on request;
The frequency control signal of described synchronization control module generated frequency generator and frequency mixer output switch control signal;
Described intermediate frequency broadband filter carries out wideband filtered to input signal;
Described intermediate frequency narrow band filter carries out narrow-band filtering to input signal;
Described A/D converter gets digital signal to the input analog signal sampling;
Described Digital Down Convert is carried out down-converted to the digital signal and the local digital controlled oscillator outgoing carrier of described A/D converter output;
Described digital controlled oscillator is by the local orthogonal digital carrier wave of control output two-way;
Described correlation detects signal after the described Digital Down Convert is carried out the detection of pseudo-code correlation;
Described thick trapping module receives the result that described correlation detects, and judges slightly to catch according to the result and finishes and produce the signal that startup is carefully caught;
Described thin trapping module carries out correlation to digital fixed intermediate frequency signal and detects, and generation changes the enabling signal of slightly catching over to and catches and finish signal according to testing result.
Frequency hopping spread spectrum (FHSS) communication system catching method based on folding sampling provided by the invention is caught by the fast and reliable that can realize frequency hopping spread spectrum (FHSS) communication system that is used of each module in the device.
Advantage of the present invention is: the method that provides a kind of frequency hopping spread spectrum (FHSS) communication system to catch fast, the signal in the whole frequency hopping bandwidth is adopted folding sampling, and reduce frequency hopping frequency to be searched at double, thereby reduce capture time.
Description of drawings
Fig. 1 is the frequency hopping spread spectrum (FHSS) communication system acquisition equipment based on folding sampling provided by the invention.
Fig. 2 is that the frequency hopping spread spectrum (FHSS) communication system based on folding sampling provided by the invention is caught flow chart.
Fig. 3 slightly catches flow chart.
Fig. 4 carefully catches flow chart.
Embodiment
For making technical scheme of the present invention and advantage clearer, embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
As shown in Figure 2, the invention provides a kind of catching method that is used for frequency hopping spread spectrum (FHSS) communication system, this method can be applicable to the receiving terminal of frequency hopping spread spectrum (FHSS) communication system, can realize that this device comprises radio-frequency filter, frequency mixer by acquisition equipment shown in Figure 1, frequency generator, Synchronization Control, intermediate frequency broadband filter, the intermediate frequency narrow band filter, A/D converter, Digital Down Convert, digital controlled oscillator, correlation detects, and slightly catches and carefully catches.
Below in conjunction with each part of acquisition equipment, catching method is described, mainly comprise:
The jumping spread spectrum radio frequency signal x (t) of step S1, reception is through after carrying out radio frequency down-conversion with the local analog carrier signal of frequency generator generation by frequency mixer behind the radio-frequency filter, obtain r (t) to pass through the intermediate frequency broadband filter, with f
s=2W/M is the A/D sample frequency, obtains digital broadband signal r (n).Wherein W is total frequency hopping bandwidth, and note frequency hopping crack bandwidth frequently is B, and total frequency hopping frequency number is N, then W=NB; M gets positive integer, is folding multiple.
Step S2, the frequency of digital controlled oscillator is set, r (n) is carried out Digital Down Convert obtain y (n).Y (n) is slightly caught,, produce the enabling signal of carefully catching if judging slightly to catch finishes.
Step S3, frequency generator is set, the signal after the radio frequency mixing is through the intermediate frequency narrow band filter, and the conversion of A/D sampler obtains digital fixed intermediate frequency signal.
Step S4, the described digital fixed intermediate frequency signal of step S3 is carried out correlation detect, if thin acquisition success then changes step S5 over to; Otherwise produce the enabling signal of slightly catching.
Step S5, catch and finish, frequency generator output and the synchronous normal hop rate local carrier of emission Frequency Hopping Signal.
Fig. 3 has provided the flow process of slightly catching.The result who slightly catches according to correlation detection output compares with setting thresholding, when surpassing thresholding, slightly catches and finishes, and startup is carefully caught, otherwise adjusts the frequency of digital controlled oscillator, searches for next frequency.
Fig. 4 has provided the flow process of carefully catching.Slightly catch finish after, gained frequency f
lExpression, corresponding frequency hopping emission frequency has M, i (individual being designated as of 1≤i≤M):
Carefully catch and from this M frequency, to determine the emission frequency.
Carefully catch according to the result who slightly catches, need to determine the frequency sets { f of detection
1, f
2..., f
i..., f
M(1≤i≤M), detect the output result according to correlation and determine carefully to catch the enabling signal of finishing and slightly catching comprises:
S41, reception correlation testing result.
If S42, comparison correlation and predetermined threshold greater than thresholding then enter proof procedure, are carried out S44; Otherwise carry out S43.
S43, judge whether to have detected all frequencies, if then carry out S46; Otherwise carry out S45.
S44, place frequency hopping frequency and pseudo-code phase are verified, by then carrying out S47, otherwise carried out S46.
S45, from frequency set to be determined, select next frequency, frequency generator is set.
S46, start and slightly to catch, finish, verify that obstructed out-of-date then restarting slightly catch when frequency detects.
S47, carefully catch and finish.
Claims (5)
1. frequency hopping spread spectrum (FHSS) communication system catching method based on folding sampling, it is characterized in that: described method comprises:
Step 1: frequency generator is set, and the signal after the mixing is by the intermediate frequency broadband filter, and A/D converter folds sampling and obtains digital broadband signal;
Step 2: described digital broadband signal is slightly caught, produce the enabling signal of carefully catching according to the result;
Step 3: frequency generator is set, and signal is through the intermediate frequency narrow band filter after the mixing, and the A/D converter sampling obtains digital fixed intermediate frequency signal;
Step 4: described digital fixed intermediate frequency signal is carefully caught, produces the enabling signal slightly catch, carefully catch finish after, frequency generator is exported the carrier wave of normal hop rate.
2. method according to claim 1 is characterized in that, the sample rate that A/D converter folds sampling is
f
s=2W/M, wherein W is total frequency hopping bandwidth, and note frequency hopping crack bandwidth frequently is B, and total frequency hopping frequency number is N, and W=NB is arranged; M gets positive integer, is folding multiple.
3. method according to claim 1 is characterized in that, described step 2 specifically comprises:
Detect the result who exports according to correlation and compare, when surpassing thresholding, slightly catch and finish, start and carefully catch, otherwise the frequency of adjustment digital controlled oscillator is searched for next frequency with setting thresholding.
4. method according to claim 1 is characterized in that, described step 4 specifically comprises:
S41, reception correlation testing result;
If S42, comparison correlation and predetermined threshold greater than thresholding then enter proof procedure, are carried out S44; Otherwise carry out S43;
S43, judge whether to have detected all frequencies,, otherwise carry out S45 if then carry out S46;
S44, place frequency hopping frequency and pseudo-code phase are verified, by then carrying out S47, otherwise carried out S46;
S45, from frequency set to be determined, select next frequency, frequency generator is set;
S46, start and slightly to catch, finish, verify that obstructed out-of-date then restarting slightly catch when frequency detects;
S47, carefully catch and finish.
5. the frequency hopping spread spectrum (FHSS) communication system acquisition equipment based on folding sampling is characterized in that, comprising: radio-frequency filter, frequency mixer, frequency generator, Synchronization Control, intermediate frequency broadband filter, the intermediate frequency narrow band filter, A/D converter, Digital Down Convert, digital controlled oscillator, correlation detects, and slightly catches and carefully catches;
Described radio-frequency filter carries out filtering to the jumping spread spectrum radio frequency signal that receives, and bandwidth is the whole frequency hopping radio frequency bandwidth of work;
Described frequency mixer, the local carrier that input signal and described frequency synthesizer are produced carries out mixing;
Described frequency generator generates local carrier on request;
The frequency control signal of described synchronization control module generated frequency generator and frequency mixer output switch control signal;
Described intermediate frequency broadband filter carries out wideband filtered to input signal;
Described intermediate frequency narrow band filter carries out narrow-band filtering to input signal;
Described A/D converter gets digital signal to the input analog signal sampling;
Described Digital Down Convert is carried out down-converted to the digital signal and the local digital controlled oscillator outgoing carrier of described A/D converter output;
Described digital controlled oscillator is by the local orthogonal digital carrier wave of control output two-way;
Described correlation detects signal after the described Digital Down Convert is carried out the detection of pseudo-code correlation;
Described thick trapping module receives the result that described correlation detects, and judges slightly to catch according to the result and finishes and produce the enabling signal of carefully catching;
Described thin trapping module carries out correlation to digital fixed intermediate frequency signal and detects, and generation changes the enabling signal of slightly catching over to and catches and finish signal according to testing result.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546173A (en) * | 2012-07-11 | 2014-01-29 | 中兴通讯股份有限公司 | Broadband receiver, anti-interference filter circuit of broadband receiver and implementation method of anti-interference filter circuit |
| CN104218972A (en) * | 2014-08-27 | 2014-12-17 | 西安空间无线电技术研究所 | Three-dimensional quick capturing method for hopping spreading code phase and carrier wave Doppler |
| CN105897303A (en) * | 2016-03-23 | 2016-08-24 | 中国电子科技集团公司第十研究所 | Method for reducing synchronization time of frequency-hopping communication |
| CN108776261A (en) * | 2018-05-16 | 2018-11-09 | 电子科技大学 | A kind of big bandwidth frequency hopping narrow band signal multichannel lack sampling frequency measuring method |
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| EP0061351A2 (en) * | 1981-03-24 | 1982-09-29 | Nec Corporation | Receiver in a frequency hopping communication system |
| CN101635578A (en) * | 2009-08-18 | 2010-01-27 | 中国科学院微电子研究所 | Two-stage capture method and two-stage capture device for frequency hopping spread spectrum (FHSS) communication system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546173A (en) * | 2012-07-11 | 2014-01-29 | 中兴通讯股份有限公司 | Broadband receiver, anti-interference filter circuit of broadband receiver and implementation method of anti-interference filter circuit |
| CN103546173B (en) * | 2012-07-11 | 2016-08-24 | 南京中兴软件有限责任公司 | Broadband receiver anti-interference filtration circuit and implementation method and broadband receiver |
| CN104218972A (en) * | 2014-08-27 | 2014-12-17 | 西安空间无线电技术研究所 | Three-dimensional quick capturing method for hopping spreading code phase and carrier wave Doppler |
| CN104218972B (en) * | 2014-08-27 | 2016-05-04 | 西安空间无线电技术研究所 | A kind of spreading code phase place and three-dimensional quick capturing method of carrier doppler of jumping |
| CN105897303A (en) * | 2016-03-23 | 2016-08-24 | 中国电子科技集团公司第十研究所 | Method for reducing synchronization time of frequency-hopping communication |
| CN108776261A (en) * | 2018-05-16 | 2018-11-09 | 电子科技大学 | A kind of big bandwidth frequency hopping narrow band signal multichannel lack sampling frequency measuring method |
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