CN103986496A - Modulating system and method of DS/FH signal - Google Patents
Modulating system and method of DS/FH signal Download PDFInfo
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- CN103986496A CN103986496A CN201410225130.5A CN201410225130A CN103986496A CN 103986496 A CN103986496 A CN 103986496A CN 201410225130 A CN201410225130 A CN 201410225130A CN 103986496 A CN103986496 A CN 103986496A
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Abstract
The invention provides a modulating system and method of a DS/FH signal. The method includes the steps that after pseudorandom phase shift is conducted on a PN sequence, the PN sequence is multiplied by information source data, an obtained product signal is further multiplied by a frequency hopping signal, and therefore the DS/FH signal which is subjected to frequency hopping modulation after direct spectrum spreading is conducted on the information source data through the PN sequence with pseudorandom phase shift is obtained. Compared with the prior art, according to the technical scheme, higher detection resistance and larger breaking difficulty are achieved, and hence higher safety and security are achieved.
Description
[technical field]
The present invention relates to the Direct-Spread/Frequency Hopping Signal modulation technique in a kind of radio communication, the modulation technique of Direct-Spread/Frequency Hopping Signal that especially a kind of fail safe is higher.
[background technology]
In modern communications, especially in Modern Military Communications, anti-detecting, anti-interference, anti-intercepting and capturing, high efficiency becomes the indispensable technical characterstic of Modern Military Communications, such as, the LINK16 military communication Data-Link that modern American, NATO are used, three dimensionality modulation technique while just having adopted frequency hopping, spread spectrum, jumping, to reach the object that improves communication security, anti-detecting, anti-interference, become the important information sharing common platform of the land, sea, air army, greatly improved the whole fighting capacity of triphibian operation ability and local campaign.
But in existing technology, normally adopt same pseudo random sequence (PN sequence) to carry out Direct-Spread to information, therefore when under attack, if enemy has known the frequency hopping pattern that system adopts, can utilize the PN sequence of knowing to carry out successfully despreading to the information of each frequency hopping point.Therefore the hidden danger that, still exists system to be attacked and crack in prior art.
[summary of the invention]
In order to solve the above problems, so the present invention proposes a kind of DS/FH signal modulating system and method.A kind of DS/FH signal modulating system that the present invention proposes, comprising: PN sequence generator, and PN sequence phase shifter, information source data producer, information source data processor, the first multiplier, Frequency Hopping Signal maker, the second multiplier, wherein
PN sequence generator generates PN sequence and exports to PN sequence phase shifter,
PN sequence phase shifter carries out as first of the first multiplier, inputting after phase shift to PN sequence,
Information source data producer produces needs the information source data of transmission to export to information source data processor,
Information source data after the output of information source data processor is processed are inputted as second of the first multiplier,
The first multiplier multiplies each other two input signal, and output is inputted as first of the second multiplier through the signal of Direct-Spread,
Frequency Hopping Signal maker output Frequency Hopping Signal is inputted as second of the second multiplier,
The second multiplier multiplies each other two input signal, output DS/FH signal.
System as above, wherein PN sequence phase shifter comprises PN sequence shift memory and PN sequence shift controller, PN sequence shift memory is stored the PN sequence after being shifted, PN sequence shift controller is for controlling the PN sequence after the displacement that output PN sequence shift memory stores, as the PN sequence output after phase shift.
System as above, wherein PN sequence shift controller is according to the indication of pseudo-random signal of input, and the PN sequence of corresponding figure place displacement of having selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
System as above, wherein PN sequence shift controller comprises pseudorandom displacement decoding module and multiselect one module, pseudorandom displacement decoding module carries out the figure place of decoding to determine that PN sequence need to be shifted to a plurality of data bit in the pseudo-random signal of input, the PN sequence of corresponding figure place displacement that figure place that multiselect one module is shifted has as required been selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
System as above, wherein information source data processor comprises information encryption processor and MSK modulator, information encryption processor is encrypted the information source data of information source data producer output to export to MSK modulator, and the information source data of MSK modulator after encrypting are carried out the information source data output of MSK modulation after processing.
System as above, wherein Frequency Hopping Signal maker comprises:
Frequency hopping pattern output selection control, frequency hopping pattern maker, frequency hopping frequency samples generator, frequency hopping frequency is selected o controller,
Frequency hopping pattern output selection control produces collection of functions from frequency hopping pattern and selects corresponding frequency hopping pattern to produce function, and then produces different frequency hopping control data,
Frequency hopping pattern maker, according to frequency hopping control data output frequency hopping pattern,
Frequency hopping frequency samples generator, produces the carrier wave of different discrete frequencies, to need to export different carrier waves according to frequency hopping,
Frequency hopping frequency is selected o controller, according to frequency hopping pattern, selects the carrier signal output of different frequency as Frequency Hopping Signal.
The invention allows for a kind of DS/FH signal modulating method, comprise the following steps:
Steps A 1:PN sequence generator generates PN sequence and exports to PN sequence phase shifter;
Steps A 2:PN sequence phase shifter carries out as first of the first multiplier, inputting after phase shift to PN sequence;
Step B1: information source data producer produces needs the information source data of transmission to export to information source data processor;
Step B2: the information source data after the output of information source data processor is processed are as the second input of the first multiplier;
Step C1: the first multiplier multiplies each other two input signal, output is inputted as first of the second multiplier through the signal of Direct-Spread;
Step D1: Frequency Hopping Signal maker output Frequency Hopping Signal is as the second input of the second multiplier;
1: the second multiplier of step e multiplies each other two input signal, output DS/FH signal.
Method as above, wherein said PN sequence phase shifter comprises PN sequence shift memory and PN sequence shift controller,
Described steps A 2 comprises:
Steps A 21:PN sequence shift memory is stored the PN sequence after being shifted;
Steps A 22:PN sequence shift controller is for controlling the PN sequence after the displacement that output PN sequence shift memory stores, as the PN sequence output after phase shift.
Method as above, wherein steps A 22 comprises:
PN sequence shift controller is according to the indication of pseudo-random signal of input, and the PN sequence of corresponding figure place displacement of having selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
Method as above, wherein said PN sequence shift controller comprises pseudorandom displacement decoding module and multiselect one module, wherein said steps A 22 comprises:
Steps A 221: pseudorandom displacement decoding module carries out the figure place of decoding to determine that PN sequence need to be shifted to a plurality of data bit in the pseudo-random signal of input,
Steps A 222: the PN sequence of corresponding figure place displacement that figure place that multiselect one module is shifted has as required been selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
Method as above, wherein said information source data processor comprises information encryption processor and MSK modulator, described step B2 comprises:
Step B21: information encryption processor is encrypted the information source data of information source data producer output to export to MSK modulator,
The information source data of step B22:MSK modulator after encrypting are carried out the information source data output of MSK modulation after processing.
Method as above, wherein said Frequency Hopping Signal maker comprises:
Frequency hopping pattern output selection control, frequency hopping pattern maker, frequency hopping frequency samples generator, frequency hopping frequency is selected o controller,
Described step D1 comprises:
Step D11: frequency hopping pattern output selection control produces collection of functions from frequency hopping pattern and selects corresponding frequency hopping pattern to produce function, and then produces different frequency hopping control data,
Step D12: frequency hopping pattern maker is exported frequency hopping pattern according to frequency hopping control data,
Step D12: frequency hopping frequency samples generator produces the carrier wave of different discrete frequencies, to need to export different carrier waves according to frequency hopping,
Step D14: frequency hopping frequency selects o controller to select the carrier signal output of different frequency as Frequency Hopping Signal according to frequency hopping pattern.
According to technical scheme of the present invention, the signal of each frequency hopping modulation on different frequencies, to the PN sequence (PN sequence is on time phase in other words) in code element order of implementation spread spectrum, differ several chips.The result of doing is like this: according to existing despreading method, despreading due to each Frequency Hopping Signal, all by same PN sequence, but, same sequence is the despreading that can not complete with oneself differing the PN sequence of above chip, so just reach following effect, if adverse party has known frequency hopping pattern of the present invention, also known in the technology of the present invention, frequency expansion sequence produces function, still, and due to the feature of PN sequence, the DS/FH signal of adverse party to each frequency hopping point, the continuous despreading of having no idea.That is to say, even the entirely true despreading that adverse party is accidental signal on a frequency hopping point, the signal of next frequency hopping point, as long as the PN sequence of this frequency hopping point and the spread symbols phase difference of a upper frequency are greater than a spread-spectrum code chip, your just correctly despreading of the spread-spectrum signal on second frequency.This has just strengthened the anti-detecting of this DS/FH more, has further improved the encryption strength of signal.
Of the present inventionly making a superiority be: selected PN sequence differs to be how many with last time selected sequence at every turn, is not artificially to select in order, and it is also the control that is subject to pseudo-random signal sequence, so is more difficult to decode its regularity.
[accompanying drawing explanation]
Fig. 1 is system configuration schematic diagram of the present invention
Fig. 2 is a kind of execution mode schematic diagram of modulating system of the present invention
Fig. 3 is a kind of execution mode schematic diagram of PN sequence phase shifter of the present invention
Fig. 4 is method step schematic diagram of the present invention
[embodiment]
System configuration schematic diagram of the present invention as shown in Figure 1.A kind of DS/FH signal modulating system that the present invention proposes comprises: PN sequence generator, PN sequence phase shifter, information source data producer, information source data processor, the first multiplier, Frequency Hopping Signal maker, the second multiplier.
PN sequence generator generates PN sequence and exports to PN sequence phase shifter.In PN sequence generator, store several orthogonal functions that system needs, can change as required different frequency expansion sequences.
PN sequence phase shifter carries out as first of the first multiplier, inputting after phase shift to PN sequence.This module is for generation of having the pseudo random sequence differing.The realization of this module can be referring to Fig. 2.Here said " differing ", refer to two pseudo random sequences that the same generating function of synchronization generates, one of them sequence is the shift sequence of another sequence, displacement described here, refer to these two one of them sequence A of sequence can by sequence B in shift register to the left or to the right several chips of time shift form.If sequence A can be formed to some chips that shift left by sequence B, we are called sequence A and in phase place, lag behind sequence B, and sequence B is ahead of sequence A in phase place in other words; Otherwise, if sequence A is by the some chips of sequence B displacement to the right, we say that sequence A is ahead of several chips of sequence B in phase place, are here in fact to have used the concept of phase place in sine wave, so that people are for generate differentiation successively between sequence in sequential.Chip here refers to a bit in PN sequence, and having Cycle Length is the PN sequence of L, and its waveform consists of L chip.
Wherein the preferred implementation of PN sequence phase shifter comprises PN sequence shift memory and PN sequence shift controller, wherein a kind of preferred embodiment referring to Fig. 3.PN sequence shift memory is stored the PN sequence after being shifted, and its memory capacity should be enough large, so that store the PN sequence after various possible figure places displacements.A kind of preferred PN sequence shift memory can be realized in the following way.For example PN sequence generator has m shift register cell to form the PN sequence generator polynomial structure that length is L, the PN sequence that is m for generation of progression.Output at PN sequence generator connects PN sequence shift memory, PN sequence shift memory includes L-m shift register cell in order to the shift LD to PN sequence bit, also comprises L the output tap of drawing respectively from L shift register cell output.By different taps, can directly export the PN sequence with different displacements simultaneously, therefore multiselect one module can directly select one of these taps with convenient acquisition, to have the output of the PN sequence of different displacements, reduce the demand to spatial cache, reduced time delay.
PN sequence shift controller is for controlling the PN sequence after the displacement that output PN sequence shift memory stores, as the PN sequence output after phase shift.The preferred following execution mode of PN sequence shift controller, according to the indication of the pseudo-random signal of input, this pseudo-random signal can for but must not be a kind of pseudo random sequence, the PN sequence of corresponding figure place displacement of having selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.Wherein the execution mode of PN sequence shift controller preferably includes pseudorandom displacement decoding module and multiselect one module, and pseudorandom displacement decoding module for example, carries out the figure place of decoding to determine that PN sequence need to be shifted to a plurality of data bit in the pseudo-random signal (a kind of pseudo random sequence PNX) of input.Common needed decoding figure place is relevant to PN sequence length, and while being L such as PN sequence length, if PN sequence is M sequence, the decoding figure place got can be for being not more than log
2(L+1) positive integer, if when PN sequence is GOLD sequence, the decoding figure place got can be log
2l.For example, PN sequence length is 16 o'clock, 4 bit sequences of desirable PNX; PN sequence length is 32 o'clock, 5 bit sequences of desirable PNX; The rest may be inferred by analogy.The PN sequence of corresponding figure place displacement that figure place that multiselect one module is shifted has as required been selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.For example, PN sequence length is 16, and 4 bit data positions of pseudo-random signal are 0101, and decode results value is 5, select the displacement of storing in PN sequence shift memory the PN sequence of 5 export.Because the input position of pseudorandom displacement decoding module is 4 bit sequences of taking from the sequence PNX that another pseudo random sequence produces, the state of these 4 appearance has pseudo-randomness equally so, this pseudo-randomness still has pseudo-randomness through its numerical value of decoding, so the figure place being shifted in the PN sequence of the result of multiselect one module output after being shifted also has pseudo-randomness.This PN sequence with pseudo-random phase shifts is used to the information source data Direct-Spread after processing, and makes enemy when attacking, more be difficult to determine phase shift rule, has improved fail safe.
Information source data producer produces needs the information source data of transmission to export to information source data processor.Information source data refer to the information of various needs transmission, comprise control text message, image information, control command, the relevant information that various kinds of sensors gathers.
Information source data processor is processed the information source data of information source data producer output.This module preferably includes information encryption processor and MSK modulator, and information encryption processor is encrypted the information source data of information source data producer output, so that data confidentiality; Then output it to MSK modulator, carry out minimum shift keying modulation.MSK modulator carries out minimum shift keying modulation for input through the information source data of encryption, then exports to the first multiplier; For next step spread spectrum of the first multiplier.
First of the first multiplier is input as the PN sequence through displacement, and second is input as treated information source data, and two input is multiplied each other and exported.The sequence that might as well suppose the generation of PN sequence generating function is as follows:
Γ is the Cycle Length of PN sequence, and each sequence consists of Γ chip.
X=0 represents to sequence phase from chip N0.
PN sequence after displacement can be expressed as:
X=J representative, is compared with 1-1 sequence at J moment PN sequence phase from chip NJ, and generating function is identical, but J chip of phase phasic difference.
If the threshold range of the information code element of information source data be 1 ,+1} bi-values.
The output of the first multiplier can be expressed as:
Information code element
{-1，+1}×{N
J，N
J+1……N
J+Γ-1} (1-3)
1-3 formula only represents that whole sequence is to consist of binary sequence, does not carry out any computing.
The above-mentioned signal being output as after Direct-Spread is inputted as first of the second multiplier.
The Frequency Hopping Signal of Frequency Hopping Signal maker output is as the second input of the second multiplier.
A kind of preferred embodiment of Frequency Hopping Signal maker, referring to Fig. 2, comprising:
Frequency hopping pattern output selection control, frequency hopping pattern maker, frequency hopping frequency samples generator, frequency hopping frequency is selected o controller,
Frequency hopping pattern output selection control produces collection of functions from frequency hopping pattern and selects corresponding frequency hopping pattern to produce function, and then produces different frequency hopping control data,
Frequency hopping pattern maker, according to frequency hopping control data output frequency hopping pattern,
Frequency hopping frequency samples generator, produces the carrier wave of different discrete frequencies, is generally sinusoidal wave, to need to export different carrier waves according to frequency hopping, this role is generally frequency synthesizer and takes on.
Frequency hopping frequency is selected o controller, according to frequency hopping pattern, selects the carrier signal output of different frequency as Frequency Hopping Signal.
First of the second multiplier is input as signal after Direct-Spread, and second is input as Frequency Hopping Signal, and two input is multiplied each other, and obtains it and is output as DS/FH signal, with formula, can be expressed as:
Information code element
{-1，+1}}×{N
J，N
J+1…N
J+Γ-1}×cos(ω
Jt) (1-4)
Cos (ω wherein
jt) be J Frequency Hopping Signal function constantly.
The invention allows for a kind of DS/FH signal modulating method referring to Fig. 4, comprise the following steps:
Steps A 1:PN sequence generator generates PN sequence and exports to PN sequence phase shifter;
Steps A 2:PN sequence phase shifter carries out as first of the first multiplier, inputting after phase shift to PN sequence;
Step B1: information source data producer produces needs the information source data of transmission to export to information source data processor;
Step B2: the information source data after the output of information source data processor is processed are as the second input of the first multiplier;
Step C1: the first multiplier multiplies each other two input signal, output is inputted as first of the second multiplier through the signal of Direct-Spread;
Step D1: Frequency Hopping Signal maker output Frequency Hopping Signal is as the second input of the second multiplier;
1: the second multiplier of step e multiplies each other two input signal, output DS/FH signal.
One of preferred implementation of system according to the invention, wherein said PN sequence phase shifter comprises PN sequence shift memory and PN sequence shift controller,
Therefore described steps A 2 can preferably include:
Steps A 21:PN sequence shift memory is stored the PN sequence after being shifted;
Steps A 22:PN sequence shift controller is for controlling the PN sequence after the displacement that output PN sequence shift memory stores, as the PN sequence output after phase shift.
Consider that pseudorandom displacement can bring larger beneficial effect, so can be preferably in the embodiment of steps A 22:
PN sequence shift controller is according to the indication of pseudo-random signal of input, and the PN sequence of corresponding figure place displacement of having selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
One of preferred implementation of system according to the invention, wherein said PN sequence shift controller comprises pseudorandom displacement decoding module and multiselect one module, therefore when concrete implementation step A22, can preferably include:
Steps A 221: pseudorandom displacement decoding module carries out the figure place of decoding to determine that PN sequence need to be shifted to a plurality of data bit in the pseudo-random signal of input,
Steps A 222: the PN sequence of corresponding figure place displacement that figure place that multiselect one module is shifted has as required been selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
One of preferred implementation of system according to the invention, wherein said information source data processor comprises information encryption processor and MSK modulator, therefore when concrete implementation step B2, can preferably include:
Step B21: information encryption processor is encrypted the information source data of information source data producer output to export to MSK modulator,
The information source data of step B22:MSK modulator after encrypting are carried out the information source data output of MSK modulation after processing.
One of preferred implementation of system according to the invention, wherein said Frequency Hopping Signal maker comprises:
Frequency hopping pattern output selection control, frequency hopping pattern maker, frequency hopping frequency samples generator, frequency hopping frequency is selected o controller,
Therefore, can preferably include during concrete implementation step D1:
Step D11: frequency hopping pattern output selection control produces collection of functions from frequency hopping pattern and selects corresponding frequency hopping pattern to produce function, and then produces different frequency hopping control data,
Step D12: frequency hopping pattern maker is exported frequency hopping pattern according to frequency hopping control data,
Step D12: frequency hopping frequency samples generator produces the carrier wave of different discrete frequencies, to need to export different carrier waves according to frequency hopping,
Step D14: frequency hopping frequency selects o controller to select the carrier signal output of different frequency as Frequency Hopping Signal according to frequency hopping pattern.
The DS/FH signal of realizing by technical solution of the present invention, possesses stronger anti-detecting and confidentiality, can be widely used in, in the communications field, obtaining technique effect better.
The foregoing is only the preferably example of execution mode of the present invention, not in order to limit interest field of the present invention; Simultaneously above description, for correlative technology field, special personage should understand and implement, so other do not depart from the equivalence completing under disclosed spirit and change or modification, all should comprise in the claims.
Claims (12)
1. a DS/FH signal modulating system, comprising: PN sequence generator, and PN sequence phase shifter, information source data producer, information source data processor, the first multiplier, Frequency Hopping Signal maker, the second multiplier,
Wherein PN sequence generator generates PN sequence and exports to PN sequence phase shifter, PN sequence phase shifter carries out as first of the first multiplier, inputting after phase shift to PN sequence, information source data producer produces needs the information source data of transmission to export to information source data processor, information source data after the output of information source data processor is processed are as the second input of the first multiplier, the first multiplier multiplies each other two input signal, output is inputted as first of the second multiplier through the signal of Direct-Spread, Frequency Hopping Signal maker output Frequency Hopping Signal is as the second input of the second multiplier, the second multiplier multiplies each other two input signal, output DS/FH signal.
2. the system as claimed in claim 1, wherein PN sequence phase shifter comprises PN sequence shift memory and PN sequence shift controller, PN sequence shift memory is stored the PN sequence after being shifted, PN sequence shift controller is for controlling the PN sequence after the displacement that output PN sequence shift memory stores, as the PN sequence output after phase shift.
3. system as claimed in claim 2, wherein PN sequence shift controller is according to the indication of the pseudo-random signal of input, the PN sequence of corresponding figure place displacement of having selected the carrying out of storing in PN sequence shift memory,
As the PN sequence output after phase shift.
4. system as claimed in claim 3, wherein PN sequence shift controller comprises pseudorandom displacement decoding module and multiselect one module, pseudorandom displacement decoding module carries out the figure place of decoding to determine that PN sequence need to be shifted to a plurality of data bit in the pseudo-random signal of input, the PN sequence of corresponding figure place displacement that figure place that multiselect one module is shifted has as required been selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
5. the system as described in one of claim 1-4, wherein information source data processor comprises information encryption processor and MSK modulator, information encryption processor is encrypted the information source data of information source data producer output to export to MSK modulator, and the information source data of MSK modulator after encrypting are carried out the information source data output of MSK modulation after processing.
6. the system as described in one of claim 1-5, wherein Frequency Hopping Signal maker comprises: frequency hopping pattern output selection control, frequency hopping pattern maker, frequency hopping frequency samples generator, frequency hopping frequency is selected o controller, frequency hopping pattern output selection control produces collection of functions from frequency hopping pattern and selects corresponding frequency hopping pattern to produce function, and then produce different frequency hopping control data, frequency hopping pattern maker, according to frequency hopping control data output frequency hopping pattern, frequency hopping frequency samples generator, produce the carrier wave of different discrete frequencies, to need to export different carrier waves according to frequency hopping, frequency hopping frequency is selected o controller, according to frequency hopping pattern, select the carrier signal output of different frequency as Frequency Hopping Signal.
7. a DS/FH signal modulating method, comprises the following steps:
Steps A 1:PN sequence generator generates PN sequence and exports to PN sequence phase shifter;
Steps A 2:PN sequence phase shifter carries out as first of the first multiplier, inputting after phase shift to PN sequence;
Step B1: information source data producer produces needs the information source data of transmission to export to information source data processor;
Step B2: the information source data after the output of information source data processor is processed are as the second input of the first multiplier;
Step C1: the first multiplier multiplies each other two input signal, output is inputted as first of the second multiplier through the signal of Direct-Spread;
Step D1: Frequency Hopping Signal maker output Frequency Hopping Signal is as the second input of the second multiplier;
1: the second multiplier of step e multiplies each other two input signal, output DS/FH signal.
8. method as claimed in claim 7, wherein said PN sequence phase shifter comprises PN sequence shift memory and PN sequence shift controller, described steps A 2 comprises:
Steps A 21:PN sequence shift memory is stored the PN sequence after being shifted;
Steps A 22:PN sequence shift controller is for controlling the PN sequence after the displacement that output PN sequence shift memory stores, as the PN sequence output after phase shift.
9. method as claimed in claim 8, wherein steps A 22 comprises: PN sequence shift controller is according to the indication of the pseudo-random signal of input, the PN sequence of corresponding figure place displacement of having selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
10. method as claimed in claim 9, wherein said PN sequence shift controller comprises pseudorandom displacement decoding module and multiselect one module, wherein said steps A 22 comprises:
Steps A 221: pseudorandom displacement decoding module carries out the figure place of decoding to determine that PN sequence need to be shifted to a plurality of data bit in the pseudo-random signal of input;
Steps A 222: the PN sequence of corresponding figure place displacement that figure place that multiselect one module is shifted has as required been selected the carrying out of storing in PN sequence shift memory, as the PN sequence output after phase shift.
11. methods as described in one of claim 7-10, wherein said information source data processor comprises information encryption processor and MSK modulator, described step B2 comprises:
Step B21: information encryption processor is encrypted the information source data of information source data producer output to export to MSK modulator;
The information source data of step B22:MSK modulator after encrypting are carried out the information source data output of MSK modulation after processing.
12. methods as described in one of claim 7-11, wherein said Frequency Hopping Signal maker comprises:
Frequency hopping pattern output selection control, frequency hopping pattern maker, frequency hopping frequency samples generator, frequency hopping frequency is selected o controller, and described step D1 comprises:
Step D11: frequency hopping pattern output selection control produces collection of functions from frequency hopping pattern and selects corresponding frequency hopping pattern to produce function, and then produces different frequency hopping control data;
Step D12: frequency hopping pattern maker is according to frequency hopping control data output frequency hopping pattern;
Step D12: frequency hopping frequency samples generator produces the carrier wave of different discrete frequencies, to need to export different carrier waves according to frequency hopping;
Step D14: frequency hopping frequency selects o controller to select the carrier signal output of different frequency as Frequency Hopping Signal according to frequency hopping pattern.
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| CN110266345A (en) * | 2019-05-29 | 2019-09-20 | 南京邮电大学 | Telemetering frequency-hopping communication method based on two-dimentional hopping pattern |
| WO2020073454A1 (en) * | 2018-10-10 | 2020-04-16 | 华中科技大学 | Signal modulation and demodulation methods and phase hopping modulation and demodulation units |
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| CN110266345A (en) * | 2019-05-29 | 2019-09-20 | 南京邮电大学 | Telemetering frequency-hopping communication method based on two-dimentional hopping pattern |
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