CN102238120A - FM/Chirp composite frequency modulation mode and implementation method thereof - Google Patents

FM/Chirp composite frequency modulation mode and implementation method thereof Download PDF

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CN102238120A
CN102238120A CN2011100410591A CN201110041059A CN102238120A CN 102238120 A CN102238120 A CN 102238120A CN 2011100410591 A CN2011100410591 A CN 2011100410591A CN 201110041059 A CN201110041059 A CN 201110041059A CN 102238120 A CN102238120 A CN 102238120A
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frequency
carrier
chirp
modulation
frequency modulation
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CN102238120B (en
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周运伟
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • 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
    • H04B1/69—Spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B2001/6912—Spread spectrum techniques using chirp

Abstract

The invention relates to an FM/Chirp composite frequency modulation mode and an implementation method thereof, belonging to the field of communication. The FM/Chirp composite frequency modulation mode provided by the invention is as follows: a sending end modulation process refers to taking a composite frequency modulation carrier, which is formed by performing secondary frequency modulation on a Chirp pulse carrier by a base band signal to be modulated, as a communication signal; and a receiving end modulation process refers to recovering a restoring sample of the base band signal to be modulated according to a frequency change rule which is added to the Chirp pulse carrier in the secondary frequency modulation process and contained in the composite frequency modulation carrier. The invention further provides two modulation methods for implementing the FM/Chirp composite frequency modulation mode, a related despreading method and a local Chirp pulse carrier frequency sweeping period synchronization method used with the related despreading method. The provided method for implementing information transmission through frequency modulation on the Chirp pulse carrier makes up the defects of Chirp modulation used in communication, and is further convenient for compatibly implementing the frequency modulation mode of the type corresponding to the secondary frequency modulation.

Description

A kind of FM/Chirp combination frequency modulation system and its implementation
Technical field
The present invention relates to a kind of FM/Chirp combination frequency modulation system and its implementation, belong to the communications field.
Background technology
Frequency modulation(FM) (FM) is that a class utilizes the frequency change of sinusoidal carrier to transmit the modulation system of information, and typical FM modulation system has polytypes such as analog linearity FM, FFSK, 4FSK, C4FM, GMSK, TFM.The FM modulated carrier has permanent envelope; Transmitting terminal can use high efficiency C class resonant radio frequency power amplifier, is convenient to realize high-power emission; Additional amplitude modulation and strong jamming adverse effect that receiving terminal can adopt amplitude limiter to suppress to introduce in the transmission course have stronger anti-fading and antijamming capability than amplitude modulation(PAM) and phase modulation method when using in mobile communication environment.
Chirp modulation claims the frequency sweep modulation again, is that the frequency by the control sinusoidal carrier is made a kind of band spectrum modulation mode that monotone variation on a large scale forms by specific rule in time, still belongs to the frequency modulation(FM) type.For the time span unit repeats, the modulated carrier after the Chirp modulation also is known as the Chirp pulse carrier with the frequency sweep cycle in the Chirp modulation.
The Chirp pulse carrier both can produce with active technique, also can produce with passive method; Wherein, active technique is with the frequency that baseband waveform removes to control the sinusoidal carrier of voltage controlled oscillator (VCO) output large-scale monotone variation to take place, because of the linearity to voltage controlled oscillator (VCO) requires the very high realization that is difficult to; Passive method is to adopt surface acoustic wave (SAW) broadening line to produce the Chirp pulse carrier, is subject to the physical structure of surface acoustic wave (SAW) broadening line and is not easy to produce multiple Chirp pulse carrier with different frequency sweep rules, different frequency sweep bandwidth and different sweep rates.The demodulation of Chirp pulse carrier, the main employing can be realized synchronous surface acoustic wave (SAW) compressed lines or dispersive delay line fast.Be subjected to the restriction of surface acoustic wave (SAW) device physics structure, can not utilize a kind of surface acoustic wave (SAW) compressed lines or dispersive delay line to come the multiple Chirp pulse carrier of demodulation with different frequency sweep bandwidth, different frequency sweep cycle, different frequency sweep rules.Be subject to that the Chirp pulse carrier produces and the demodulation Devices Characteristics, mainly at present come transmission information by modulation to amplitude, frequency sweep rule type or the initial phase parameter of Chirp pulse carrier.
The frequency change rule of Chirp pulse carrier in a frequency sweep cycle is known as the frequency sweep rule.The frequency sweep rule of Chirp pulse carrier has dull rising, the dull two kinds of citation forms that descend, also have earlier dull rise again dullly descend, the dull dull simple combination form that rises and so on that descends again earlier, also have dullness with some to rise and dull decline rule by certain complex combination form that is spliced to form in proper order; Its dull rising and the dull Changing Pattern that descends also have linearity and non-linear branch.
The frequency sweep rule of Chirp pulse carrier has the branch of positive and negative frequency sweep rule and former, complementary frequency sweep rule.For certain frequency sweep rule,, then be referred to as positive frequency sweep rule or former frequency sweep rule if use by the order normal time in its frequency sweep cycle (promptly from the frequency of frequency sweep cycle starting position frequency change) to the frequency sweep cycle end position; If use by this frequency sweep rule opposite time sequencing (promptly from the frequency of the frequency sweep cycle end position frequency change to the frequency sweep cycle starting position) in frequency sweep cycle, the new frequency sweep rule that then will form thus is referred to as the anti-frequency sweep rule of former frequency sweep rule; If use in order by the normal time in certain frequency sweep rule frequency sweep cycle, but the frequency change rule of its frequency change rule and former frequency sweep rule is the centre frequency with the Chirp pulse carrier is that center line is symmetrically distributed, and the new frequency sweep rule that then will form thus is referred to as the complementary frequency sweep rule of former frequency sweep rule.
In recent years, along with the maturation of digital frequency synthesis technology, can produce the Chirp pulse carrier that carrier frequency stepping (Stepping) changes easily.For the ease of distinguishing, the Chirp pulse carrier that carrier frequency continuous (Continuous) is changed is called the C-Chirp pulse carrier; Correspondingly, the Chirp pulse carrier that carrier frequency stepping (Stepping) is changed is called the S-Chirp pulse carrier.
The combination frequency modulation is by carrying out the senior frequency modulation(FM) mode that the secondary frequency modulation(FM) forms to carrying out once warbled carrier wave (a frequency modulation(FM) carrier wave is called for short in the back).Combination by the different frequency modulation system can obtain different special-effects, is used to satisfy some special application requirements, as secure radio communication, arrowband high-quality analog video transmission etc.The realization of combination frequency modulation have separate modulation device separately the multicarrier combination, have only the various ways such as multicarrier combination of a modulator.
Summary of the invention
First problem that the present invention will solve provides a kind of FM/Chirp combination frequency modulation system, handles and realizes message transmission by the Chirp pulse carrier being carried out frequency modulation(FM) and frequency demodulation.
Second problem that the present invention will solve provides the implementation method of this FM/Chirp combination frequency modulation system, so that this FM/Chirp combination frequency modulation system is carried out theory analysis and Project Realization.
In order to address the above problem, the present invention provides the overall technological scheme of this FM/Chirp combination frequency modulation system earlier, two kinds of modulator approaches of the modulated process of realizing making a start in this FM/Chirp combination frequency modulation system are provided then, relevant despreading is handled in a kind of receiving end demodulating process of realizing this FM/Chirp combination frequency modulation system the method and the frequency sweep cycle method for synchronous of the matching used local Chirp pulse carrier of a kind of relevant despreading method with this are provided again.
(1) FM/Chirp combination frequency modulation system
A kind of combination frequency modulation system, modulation and receiving end demodulation two are partly formed by making a start, its overall technological scheme is: the modulation of making a start is to adopt the Chirp pulse carrier as a frequency modulation(FM) carrier wave, with treating that modulating baseband signal carries out the formed combination frequency modulated carrier of secondary frequency modulation(FM) as signal of communication to the Chirp pulse carrier; The receiving end demodulation is according to the modulating baseband signal for the treatment of that comprises in the combination frequency modulated carrier that receives the frequency change rule that the Chirp pulse carrier carries out adding to the Chirp pulse carrier in the secondary frequency modulation procedure to be recovered the reduction sample for the treatment of modulating baseband signal.Because this combination frequency modulation system is that the Chirp pulse carrier is carried out frequency modulation(FM) (FM), therefore it is called FM/Chirp combination frequency modulation system, or is called for short and does the FM/Chirp modulation; Correspondingly, the modulated carrier that produces by FM/Chirp combination frequency modulation system can be called for short and makes the FM/Chirp modulated carrier.
In the modulated process of making a start of this FM/Chirp modulation, treat that modulating baseband signal carries out the formed FM/Chirp modulated carrier of secondary frequency modulation(FM) to the Chirp pulse carrier and can be expressed as
S(t)＝cos{2π[f 0+μ(t)+Ω(t)]t} (1)
Wherein, f 0It is the centre frequency of FM/Chirp modulated carrier, μ (t) is the employed frequency sweep rule of Chirp pulse carrier, and Ω (t) treats that modulating baseband signal carries out additional frequency change rule to the Chirp pulse carrier in the secondary frequency modulation procedure to the Chirp pulse carrier.For the ease of realizing and the compatibility of FM modulation, require to treat that modulating baseband signal is undertaken in modulated process additional to the frequency change rule of sinusoidal carrier identical with adopting the identical modulating baseband signal for the treatment of by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types to the frequency change rule Ω (t) that the Chirp pulse carrier carries out adding in the secondary frequency modulation procedure to the Chirp pulse carrier.
In FM/Chirp modulated carrier as the formula (1), though μ (t) and Ω (t) are the frequency change rule of carrier wave, but μ (t) is the frequency sweep rule that is used to realize spread spectrum that forms in frequency modulation procedure, has only Ω (t) to be only according to the frequency change rule that really is used to the information of transmitting for the treatment of that modulating baseband signal produces.Since primary modulation in the above-mentioned FM/Chirp modulation system and secondary modulation all at be the frequency of carrier wave, so the FM/Chirp modulated carrier is permanent envelope, still can continue to use the C class tuned power amplifier that the FM modulation is used.
Especially, if the amplitude of the frequency sweep rule μ (t) of employed Chirp pulse carrier equals 0, then the FM/Chirp modulated carrier has just become and has treated that modulating baseband signal carries out the formed FM modulated carrier of frequency modulation(FM) by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types, that is:
S′(t)＝cos{2π[f 0+Ω(t)]t} (2)
In the receiving end demodulating process of above-mentioned FM/Chirp modulation, in order to recover the reduction sample for the treatment of modulating baseband signal according to the frequency change rule Ω (t) that really is used to the information of transmitting in the FM/Chirp modulated carrier as the formula (1), its processing procedure is: handle by relevant despreading and remove the frequency sweep rule μ (t) that is used to realize spread spectrum that comprises in the FM/Chirp modulated carrier that receives, obtain the relevant despreading result who only comprises Ω (t) composition shown in the similar formula (2), adopt the frequency demodulation processing of the frequency modulation(FM) mode of secondary frequency modulation(FM) institute corresponding types from relevant despreading result, to recover the reduction sample for the treatment of modulating baseband signal.
In above-mentioned FM/Chirp modulation, the caused interference of synchronous error when in the receiving end demodulating process relevant despreading being handled suppresses, and the frequency sweep cycle as the Chirp pulse carrier of a frequency modulation(FM) carrier wave in the modulated process of making a start is done following restriction:
(1) when treating that modulating baseband signal is analog signal, as the frequency sweep cycle length of the Chirp pulse carrier of a frequency modulation(FM) carrier wave less than the single Cycle Length for the treatment of the highest effective frequency component in the modulating baseband analog signal;
(2) when treating that modulating baseband signal is digital signal, as the frequency sweep cycle length of the Chirp pulse carrier of a frequency modulation(FM) carrier wave less than the single duration length for the treatment of the modulating baseband numeric code.
In above-mentioned FM/Chirp modulation, the frequency sweep rule of using as the Chirp pulse carrier of a frequency modulation(FM) carrier wave have dullly rise, the dull two kinds of citation forms and of descending by the combining forms of these two kinds of citation forms through being spliced to form; Dullness in its frequency sweep rule rises and dull decline changes, can change by linearity or nonlinear rules, can change by continuous or step-type mode (that is C-Chirp pulse carrier and S-Chirp pulse carrier all can be used as a frequency modulation(FM) carrier wave use).
Because the FM modulation has polytype, frequency sweep rule as the Chirp pulse carrier of a frequency modulation(FM) carrier wave also has various ways, the Chirp pulse carrier also has the branch of C-Chirp pulse carrier and S-Chirp pulse carrier, therefore the FM/Chirp modulation need be divided into different subclasses, so that distinguish.As:
(1) classifies according to the carrier frequency variation mode of use Chirp pulse carrier
If the C-Chirp pulse carrier is carried out frequency modulation(FM) (FM), then this combination frequency modulation system is called FM/C-Chirp combination frequency modulation system, or is called for short and does the FM/C-Chirp modulation; Correspondingly, the modulated carrier that produces by FM/C-Chirp combination frequency modulation system can be called for short and makes the FM/C-Chirp modulated carrier.
If the S-Chirp pulse carrier is carried out frequency modulation(FM) (FM), then this combination frequency modulation system is called the modulation of FM/S-Chirp combination frequency, or is called for short and does the FM/S-Chirp modulation; Correspondingly, the modulated carrier that produces by FM/S-Chirp combination frequency modulation system can be called for short and makes the FM/S-Chirp modulated carrier.
(2) classify according to the employed frequency modulation(FM) mode of secondary frequency modulation(FM) type
If the frequency modulation(FM) mode of using when the C-Chirp pulse carrier is carried out the secondary frequency modulation(FM) is analog linearity FM modulation, then this combination frequency modulation system is called analog linearity FM/C-Chirp modulation.
If the frequency modulation(FM) mode of using when the S-Chirp pulse carrier is carried out the secondary frequency modulation(FM) is modulated as FFSK, then this combination frequency modulation system is called the FFSK/S-Chirp modulation.
So analogize, also have 4FSK/C-Chirp, 4FSK/S-Chirp, GMSK/C-Chirp, GMSK/S-Chirp, etc. a plurality of subclasses.
In addition, also can classify according to parameters such as the frequency sweep rule type of Chirp pulse carrier, sweep rates.
Confusion of concepts in the subsequent descriptions, as follows to the implication regulation of relevant noun:
When (1) using FM one speech separately, representative be all analog-and digital-frequency modulation(FM) modes;
When (2) using Chirp one speech separately, representative be C-Chirp and S-Chirp;
When (3) using FM/Chirp one speech separately, what FM represented is all analog-and digital-frequency modulation(FM) modes, and that Chirp represents is C-Chirp and S-Chirp.
(2) modulator approach one
A kind of modulator approach of the modulated process of realizing making a start in the above-mentioned FM/Chirp combination frequency modulation system: obtain the FM modulated carrier with treating that modulating baseband signal is modulated by the FM modulation system offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types, this FM modulated carrier and Chirp pulse carrier are carried out mixing, extract in the mixing output with frequently or difference frequency component as FM/Chirp modulated carrier as signal of communication.The implementation procedure of this modulator approach is as follows:
(1) centre frequency is f 0, the frequency sweep rule is that the Chirp pulse carrier of μ (t) can be expressed as
S 2(t)＝cos{2π[f 0+μ(t)]t} (3)
(2) with treating that modulating baseband signal is that the sinusoidal carrier of f1 carries out the FM modulated carrier that the FM modulation obtained and is by the frequency modulation(FM) mode of secondary frequency modulation(FM) institute corresponding types to centre frequency
S 3(t)＝cos{2π[f 1+Ω(t)]t} (4)
Wherein, Ω (t) is according to treating modulating baseband signal frequency change rule that form, that be used to the information of transmitting;
(3) with Chirp pulse carrier S 2(t) with FM modulated carrier S 3(t) carry out mixing, mixing is output as
S 4 ( t ) = S 2 ( t ) S 3 ( t ) = cos { 2 π [ f 0 + μ ( t ) ] t } cos { 2 π [ f 1 + Ω ( t ) ] t }
= 1 2 cos { 2 π [ f 0 + f 1 + μ ( t ) + Ω ( t ) ] t } + 1 2 cos { 2 π [ ( f 0 - f 1 ) + μ ( t ) - Ω ( t ) ] t } - - - ( 5 )
Wherein, the output S of mixing 4(t) in frequency component be cos{2 π [f 0+ f 1+ μ (t)+Ω (t)] t}, difference frequency component is cos{2 π [(f 0-f 1)+μ (t)-Ω (t)] t};
(4) extraction and frequency component are as the FM/Chirp modulated carrier as signal of communication, promptly
S 5(t)＝cos{2π[f 0+f 1+μ(t)+Ω(t)]t}＝cos{2π[f T+μ(t)+Ω(t)]t} (6)
In the formula, f TEqual f 0With f 1Sum;
(5) S in the comparison expression (6) 5(t) and the S (t) in the formula (1) as can be known, the two is the centre frequency difference, the frequency sweep rule is all identical with the frequency change rule that is used to the information of transmitting, therefore can with as the formula (6) with frequency component S 5(t) as FM/Chirp modulated carrier as signal of communication.
Also can learn according to formula (5): when the conduct of the difference frequency component in the output of extracting mixing is used as the FM/Chirp modulated carrier of signal of communication, if the centre frequency of FM modulated carrier is lower than the centre frequency of Chirp pulse carrier, what then the FM/Chirp modulated carrier adopted is and the identical frequency sweep rule of the employed frequency sweep rule of Chirp pulse carrier, actual transmissions be the anti-phase waveform for the treatment of modulating baseband signal; If the centre frequency of FM modulated carrier is higher than the centre frequency of Chirp pulse carrier, then actual what use is frequency sweep rule with the complementation of the employed frequency sweep rule of Chirp pulse carrier to the FM/Chirp modulated carrier, actual transmissions be the phase wiggles for the treatment of modulating baseband signal.
In this modulator approach, the S-Chirp pulse carrier of carrier frequency continually varying C-Chirp pulse carrier and carrier frequency stepwise change all can use.Especially, if the amplitude of the frequency sweep rule μ (t) of Chirp pulse carrier equals 0, then the FM/Chirp modulated carrier that produces by this method has just become and has treated that modulating baseband signal carries out the FM modulated carrier that frequency modulation(FM) obtained by the FM modulation system offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types.
(3) modulator approach two
Make a start in a kind of subclass FM/S-Chirp combination frequency modulation system that the realizes aforementioned FM/Chirp combination frequency modulation system modulator approach of modulated process, its content is: adopt numerical frequency synthetic (DDS) to produce the FM/S-Chirp modulated carrier; Wherein, the frequency tuning word in the numerical frequency building-up process (Frequency Tuning Word is called for short FTW) is according to the centre frequency (f of S-Chirp pulse carrier 0) and stepping frequency change rule (μ (t)) and treat that the frequency change rule (Ω (t)) that modulating baseband signal forms when carrying out frequency modulation(FM) by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types determines jointly, that is:
(1) according to the centre frequency (f of S-Chirp pulse carrier 0) obtain the median (FTW of frequency tuning word 0), obtain frequency sweep modulating frequency changing value (FTW with plus or minus value according to the stepping frequency change rule (μ (t)) of S-Chirp pulse carrier μ(t)), according to treating that frequency change rule (Ω (t)) that the frequency modulation(FM) mode offset of sinusoidal carrier wave of modulating baseband signal by secondary frequency modulation(FM) institute corresponding types forms when carrying out frequency modulation(FM) obtains the frequency modulation(FM) frequency change value (FTW with plus or minus value Ω(t));
(2) the frequency tuning word (FTW) that is used to produce the FM/S-Chirp modulated carrier is the median (FTW of frequency tuning word 0), frequency sweep modulating frequency changing value (FTW μAnd frequency modulation(FM) frequency change value (FTW (t)) Ω(t)) sum, that is:
FTW＝FTW 0+FTW μ(t)+FTW Ω(t) (7)
(3) according to the value of frequency tuning word (FTW), synthetic (DDS) circuit of numerical frequency produces the amplitude value sequence of the sinusoidal carrier waveform on each stepping frequency of FM/S-Chirp modulated carrier, converts the waveform of FM/S-Chirp modulated carrier again to by digital-to-analog.
Obviously, this modulator approach can only be used the S-Chirp pulse carrier of carrier frequency stepwise change, realization be FM/S-Chirp modulation.Especially, if frequency sweep modulating frequency changing value (FTW μ(t)) be 0, then the FM/S-Chirp modulated carrier that produces by this modulator approach has just become and has treated that modulating baseband signal carries out the FM modulated carrier that the FM modulation is obtained by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types.
(4) relevant despreading method
The method that relevant despreading is handled in a kind of receiving end demodulation that realizes aforementioned FM/Chirp combination frequency modulation system partly, its content is: the FM/Chirp modulated carrier and the local Chirp carrier wave that receive are carried out mixing, extract in the output of mixing with frequently or difference frequency component as relevant despreading result; The employed frequency sweep rule of local Chirp pulse carrier meets the following conditions: when the difference frequency component in the output of extracting mixing as relevant despreading as a result the time, the frequency sweep rule that comprises in the frequency sweep rule of local Chirp pulse carrier and the FM/Chirp modulated carrier that receives is identical and frequency sweep cycle is synchronous; When in the output of extracting mixing with frequency component as relevant despreading as a result the time, the complementation of frequency sweep rule and the frequency sweep cycle that comprise in the frequency sweep rule of local Chirp pulse carrier and the FM/Chirp modulated carrier that receives are synchronous.
Is example with the difference frequency component in the output of extracting mixing as relevant despreading result, and the realization principle of this relevant despreading method is described:
(1) identical, the centre frequency of the frequency sweep rule that comprises in frequency sweep rule and the FM/Chirp modulated carrier that receives is f LLocal Chirp pulse carrier can be expressed as
S L(t)＝cos{2π[f L+μ(t-τ)]t} (8)
Wherein, τ is the frequency sweep cycle synchronous error of local Chirp pulse carrier;
(2) with local Chirp pulse carrier S L(t) carry out mixing with the FM/Chirp modulated carrier S (t) that receives, mixing is output as
S 6 ( t ) = S ( t ) S L ( t ) = cos { 2 π [ f 0 + μ ( t ) + Ω ( t ) ] t } cos { 2 π [ f L + μ ( t - τ ) ] t }
= 1 2 cos { 2 π [ f 0 + f L + μ ( t ) + μ ( t - τ ) + Ω ( t ) ] t } - - - ( 9 )
+ 1 2 cos { 2 π [ ( f 0 - f L ) + ( μ ( t ) - μ ( t - τ ) ) + Ω ( t ) ] t }
Wherein, the output S of mixing 6(t) in frequency component be cos{2 π [f 0+ f L+ μ (t)+μ (t-τ)+Ω (t)] t}, difference frequency component is cos{2 π [(f 0-f L)+(μ (t)-μ (t-τ))+and Ω (t)] t};
(3) when the frequency sweep cycle of local Chirp pulse carrier was synchronous, τ equaled 0, the output S of mixing 6(t) difference frequency component in is
S 7(t)＝cos{2π[(f 0-f L)+(μ(t)-μ(t))+Ω(t)]t}
＝cos{2π[f IF+Ω(t)]t} (10)
In the formula, f IFEqual f 0With f LPoor.
S in the comparison expression (10) 7(t) and the S (t) in the formula (2) as can be known, the two is the centre frequency difference, but it is identical to be used to the frequency change rule of the information of transmitting, therefore can be with the difference frequency component shown in the formula (10) as relevant despreading result.In actual applications, the carrier frequency of the difference frequency component of mixing output can not be for negative, if the centre frequency height of the FM/Chirp modulated carrier that the center frequency ratio of local Chirp pulse carrier receives, then follow-up what obtain when relevant despreading result is carried out frequency demodulation is the reduction sample for the treatment of the anti-phase waveform of modulating baseband signal.
Also can learn according to formula (9): if extract in the mixing output with frequency component as relevant despreading result, the complementation of frequency sweep rule and the frequency sweep cycle that are comprised in the FM/Chirp modulated carrier that then requires the frequency sweep rule of local Chirp pulse carrier employing and receive are synchronous, in the output of mixing this moment also is to be similar to the FM modulated carrier form shown in the formula (2) with frequency component, and follow-up what obtain when relevant despreading result is carried out frequency demodulation is the reduction sample for the treatment of modulating baseband signal.
In this relevant despreading method, if the amplitude of the frequency sweep rule μ (t) of local Chirp pulse carrier reduces to 0, the local Chirp pulse carrier signal S in the formula (8) then L(t) just be degenerated to the sinusoidal carrier that does not add modulation; At this moment, the process of mixing and extraction difference frequency component just is equivalent to carry out down-conversion one time; If the modulated carrier that receives is the FM modulated carrier, then just in time adopts follow-up frequency demodulation to handle from the difference frequency component of mixing output and recover the reduction sample for the treatment of modulating baseband signal that is modulated in this FM modulated carrier.
(5) local Chirp pulse carrier frequency sweep cycle method for synchronous
The matching used local Chirp pulse carrier frequency sweep cycle method for synchronous of a kind of and above-mentioned relevant despreading method, its content is: adopt narrowband intermediate frequency filtering extract in the mixing output with frequency component or difference frequency component, the bandwidth of narrowband intermediate frequency filtering equals to make a start and treats the shared bandwidth of FM modulated carrier that obtains when modulating baseband signal is modulated by the FM modulation system offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types in the modulated process; Frequency sweep cycle phase place traversal formula in necessarily between phase region of local Chirp pulse carrier is adjusted; On each phase position, keep several frequency sweep cycles, detect the intensity of the output signal of narrowband intermediate frequency filtering during this period; Relatively the intensity of the output signal of narrowband intermediate frequency filtering on different phase positions will the position of the phase position of intensity maximum as the frequency sweep cycle synchronous error minimum of local Chirp pulse carrier occur.
To adopt the difference frequency component in the narrowband intermediate frequency filtering extraction mixing output is example, and the realization principle of this this locality Chirp pulse carrier frequency sweep cycle method for synchronous is described:
(1) the identical and frequency sweep cycle fully synchronously time the when the frequency sweep rule that comprises in the frequency sweep rule of local Chirp pulse carrier and the FM/Chirp modulated carrier that receives, the output S of the mixing shown in the formula (9) 6(t) difference frequency component in just falls within the bandwidth of narrowband intermediate frequency filtering, and the amplitude that narrowband intermediate frequency filtering produces this difference frequency component suppresses minimum, the intensity maximum of the output signal of narrowband intermediate frequency filtering;
(2) there is synchronous error τ between the frequency sweep cycle if the frequency sweep rule that comprises in the frequency sweep rule of local Chirp pulse carrier and the FM/Chirp modulated carrier that receives is identical, then the output S of the mixing shown in the formula (9) 6(t) difference frequency component in is
S 8(t)＝cos{2π[(f 0-f L)+(μ(t)-μ(t-τ))+Ω(t)]t}
＝cos{2π[f IF+(μ(t)-μ(t-τ))+Ω(t)]t} (11)
Because μ (t) in the formula (11)-μ (t-τ) value is not equal to 0, the difference frequency component S in the formula (11) 8(t) centre frequency can be at f IFNear the variation, its bandwidth will be above the passband of narrowband intermediate frequency filtering, narrowband intermediate frequency filtering this moment is big fully synchronously the time to the frequency sweep cycle of the local Chirp pulse carrier of amplitude-suppression ratio that this difference frequency component produced, so the local Chirp pulse carrier of the strength ratio of the output signal of narrowband intermediate frequency filtering frequency sweep cycle is little fully synchronously the time.
Hence one can see that, and the difference frequency component in the output of above-mentioned mixing can be used as the synchronous error situation of the frequency sweep cycle of judging local Chirp pulse carrier and the foundation of change direction through the corresponding relation between the frequency sweep cycle synchronous error of filtered signal strength signal intensity of narrowband intermediate frequency and local Chirp pulse carrier.
This this locality Chirp pulse carrier frequency sweep cycle method for synchronous, the initial synchronisation of establishment stage if be used to communicate by letter, the phase place adjustment interval of the frequency sweep cycle of then local Chirp pulse carrier is generally one or more frequency sweep cycles, and the stepping amount of its phase place adjustment is chosen as N/one (N is the positive integer greater than 1) of frequency sweep cycle; If be used for the synchronous maintenance of tracking phase, the phase place of the frequency sweep cycle of then local Chirp pulse carrier is adjusted interval near desirable frequency sweep cycle sync bit, and the phase place that the stepping amount that its phase place is adjusted also correspondingly adopts when synchronous less than initial ranging is adjusted the stepping amount.Adopt the frequency sweep cycle method for synchronous of this this locality Chirp pulse carrier, can make up the parallel synchronous scheme that local Chirp pulse carrier that multichannel has different frequency sweep cycle phase positions detects simultaneously, also can make up one tunnel local Chirp pulse carrier and adjust to the serial synchronization scenario that detects on the different frequency sweep cycle phase places respectively.
(6) beneficial effect
FM/Chirp modulation system provided by the present invention is a kind of by the Chirp pulse carrier being carried out the new method that frequency modulation(FM) and frequency demodulation realize message transmission.With traditional Chirp chopping phase ratio, its beneficial effect has: the FM/Chirp modulated carrier is the frequency-modulated wave of permanent envelope, and its information transmitted is carried in the frequency of carrier wave, and antijamming capability comparison Chirp is stronger when pulse carrier carries out amplitude or phase modulated; Both the C-Chirp pulse carrier can be used, also the S-Chirp pulse carrier can be used; When using the S-Chirp pulse carrier, be convenient to adopt digital frequency synthesis technology to produce and adjust parameters such as frequency sweep rule, frequency sweep bandwidth, sweep rate, frequency sweep cycle phase place neatly, multiple S-Chirp pulse carrier easy to use communicates transmission; Adopt relevant despreading and traditional frequency demodulation to recover the reduction sample for the treatment of modulating baseband signal, saved and traditional the C-Chirp pulse carrier has been separated surface acoustic wave (SAW) compressed lines or the dispersive delay line that timing uses; The compatible FM modulation system that realizes secondary frequency modulation(FM) institute corresponding types is convenient in the FM/Chirp modulation, and can continue to use the C class tuned power amplifier that the FM modulation is used, and is convenient to realize high-power emission.
Description of drawings
Fig. 1 is the implementation model of the FM/Chirp combination frequency modulation system of use among the embodiment 1.Wherein, the implementation model of the modulated process of making a start shown in Fig. 1 (a), the 11st, the Chirp pulse carrier produces circuit, the 12nd, the warbled frequency modulator of secondary; Fig. 1 (b) is the implementation model of receiving end demodulating process, the 13rd, and relevant despreader, the 14th, the FM demodulator of the frequency modulation(FM) mode of secondary frequency modulation(FM) institute corresponding types.
Figure 2 shows that the FM/Chirp modulator model of using among the embodiment 2 according to modulator approach one structure.Wherein, the 21st, the FM modulator, the 22nd, the Chirp pulse carrier produces circuit, the 23rd, frequency mixer, the 24th, band pass filter.
Figure 3 shows that the FM/S-Chirp modulator model of using among the embodiment 3 according to modulator approach two structures.Wherein, the 31st, adder, the 32nd, numerical frequency combiner circuit, the 33rd, digital/analog converter.
Figure 4 shows that the relevant despreader model that the relevant despreading method of the basis of using among the embodiment 4 makes up.Wherein, the 41st, local Chirp pulse carrier produces circuit, the 42nd, frequency mixer, the 43rd, narrowband intermediate frequency filter.
Figure 5 shows that the implementation procedure schematic diagram of the local Chirp pulse carrier frequency sweep cycle method for synchronous that uses among the embodiment 5.Wherein, Fig. 5 (a) is depicted as the frequency change rule of the analog linearity FM/S-Chirp modulated carrier that receives, and Fig. 5 (b) is depicted as the frequency change rule of local S-Chirp pulse carrier, and Fig. 5 (c) is depicted as the intensity of the output signal of narrowband intermediate frequency filtering.
Embodiment
Embodiment 1
Present embodiment is used to describe the implementation procedure of FM/Chirp combination frequency modulation system provided by the invention.Adopt the implementation model of FM/Chirp combination frequency modulation system as shown in Figure 1, its course of work is as follows:
In the modulated process of making a start, the Chirp pulse carrier produces circuit (11) and produces the Chirp pulse carrier; The warbled frequency modulator of secondary (12) will treat that modulating baseband signal carries out the secondary frequency modulation(FM) to the Chirp pulse carrier and obtains the FM/Chirp modulated carrier.In the receiving end demodulating process, relevant despreader (13) is to the FM/Chirp modulated carrier that the receives despreading of being correlated with, the frequency sweep rule that comprises in the FM/Chirp modulated carrier that removal receives, acquisition only comprises the relevant despreading result of the frequency change rule that is used to the information of transmitting; Then, adopt FM demodulator (14) demodulation from the relevant despreading result of relevant despreader (13) output of the frequency modulation(FM) mode of secondary frequency modulation(FM) institute corresponding types to recover the reduction sample for the treatment of modulating baseband signal.
The modulator approach one that provides simultaneously among the present invention can be used for realizing the modulated process of making a start shown in Fig. 1 (a); When the FM/Chirp of reality combination frequency modulation system was the FM/S-Chirp modulation, the modulator approach two that provides simultaneously among the present invention also can be used for equivalence and realizes the modulated process of making a start shown in Fig. 1 (a); The relevant despreading method that provides simultaneously among the present invention can be used for realizing the performed relevant despreading processing of relevant despreader (13) of Fig. 1 (b); The local Chirp pulse carrier frequency sweep cycle method for synchronous that provides simultaneously among the present invention, can with the supporting use of relevant despreading method that provides simultaneously among the present invention, be used for realizing the initial synchronisation of relevant despreading process and follow the tracks of synchronously.
Embodiment 2
Present embodiment is used for describing the implementation procedure of the modulator approach one that the present invention provides simultaneously.Adopt the modulator model according to modulator approach one structure as shown in Figure 2, its course of work is as follows:
FM modulator (21) by the frequency modulation(FM) mode of secondary frequency modulation(FM) institute corresponding types with treating that modulating baseband signal offset of sinusoidal carrier wave carries out frequency modulation(FM) and obtains the FM modulated carrier; The Chirp pulse carrier produces circuit (22) and produces the Chirp pulse carrier; By frequency mixer (23) FM modulated carrier and Chirp pulse carrier are carried out mixing, and adopt band pass filter (24) extract frequency mixer (23) output with frequently or difference frequency component as relevant despreading result.
The operation principle of this modulator model can referring in the specification to the relevant description of this modulator approach, do not repeat them here.The modulation pattern of making a start among modulator model among Fig. 2 and Fig. 1 (a) is compared as can be known, and the acting in conjunction of the FM modulator (21) among Fig. 2, frequency mixer (23) and band pass filter (24) is equivalent to the warbled modulator of secondary (12) shown in Fig. 1 (a).
Embodiment 3
Present embodiment is used for describing the implementation procedure of the modulator approach two that the present invention provides simultaneously.Adopt the modulator model according to modulator approach two structures as shown in Figure 3, its course of work is as follows:
Adder (31) is with the median (FTW of frequency tuning word 0), frequency sweep modulating frequency changing value (FTW μAnd frequency modulation(FM) frequency change value (FTW (t)) Ω(t)) carry out addition, obtain to be used to produce the frequency tuning word (FTW) of FM/S-Chirp modulated carrier; According to frequency tuning word (FTW), numerical frequency combiner circuit (32) produces the amplitude value sequence of the sinusoidal carrier waveform on each stepping frequency of FM/S-Chirp modulated carrier, converts the waveform of FM/S-Chirp modulated carrier again to by digital/analog converter (33).
In the present embodiment, require frequency modulation(FM) frequency change value FTW Ω(t) be digital form.When the warbled type of secondary is the analog linearity frequency modulation(FM), need to treat that the analog baseband signal waveform that modulating baseband signal obtains carries out the A/D conversion after through preliminary treatment such as low-pass filtering, preemphasis, amplitude amplification, amplitude limits, and produce frequency modulation(FM) frequency change value FTW according to the corresponding relation between A/D result and the modulated carrier frequency change amplitude Ω(t); Similarly, when the warbled type of secondary is when need be between the different digital code element realizing the digital frequency modulation (as GMSK) of modulated carrier frequency smooth change during transition, also can will treat that the analog baseband signal that the modulated digital baseband signal obtains afterwards in process pre-distortion (as gaussian filtering) carries out the A/D conversion, and produce frequency modulation(FM) frequency change value FTW according to the corresponding relation between A/D result and the modulated carrier frequency change amplitude Ω(t).Certainly, if the warbled type of secondary is digital frequency modulation and the smooth change problem that does not need to consider the modulated carrier frequency between the different digital code element during transition, then can be directly according to treating that the pairing frequency offset of modulation digital base band symbol produces frequency modulation(FM) frequency change value FTW Ω(t).
Embodiment 4
Present embodiment is used for describing the implementation procedure of the relevant despreading method that the present invention provides simultaneously.The relevant despreader model that adopts the relevant despreading method of basis as shown in Figure 4 to make up adopts narrowband intermediate frequency filter (43) to extract relevant despreading result in this relevant despreader model.Its course of work is as follows:
Local Chirp pulse carrier produces circuit (41) and produces the local Chirp pulse carrier that frequency sweep rule type meets the requirements and frequency sweep cycle is synchronous; By frequency mixer (42) the local Chirp pulse carrier that the FM/S-Chirp modulated carrier that receives and local Chirp pulse carrier produce circuit (41) output is carried out mixing, adopt narrowband intermediate frequency filter (43) extract in the mixing output with frequently or difference frequency component as relevant despreading result.
Operation principle that should relevant despreader model can referring in the specification to the relevant description of this relevant despreading method, do not repeat them here.
Embodiment 5
Present embodiment is used for describing the implementation procedure of the local Chirp pulse carrier frequency sweep cycle method for synchronous that the present invention provides simultaneously.Adopt relevant despreader model as shown in Figure 4; Narrowband intermediate frequency filtering (43) is used to extract relevant despreading result, and its filtering bandwidth equals to make a start and treats the shared bandwidth of FM modulated carrier that modulating baseband signal is obtained when carrying out the FM modulation by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types in the modulated process.
Suppose that the FM/Chirp modulated carrier that receives keeps amplitude stabilization during the realization synchronous searching.One tunnel local Chirp pulse carrier adjusted to respectively on the different frequency sweep cycle phase places detects (being the serial synchronization scenario), its process that realizes initial synchronisation as shown in Figure 5, implementation step is as follows:
(1) be that the stepping amount of phase place adjustment is adjusted (in situation as shown in Figure 5, N=7) the frequency sweep cycle phase place of local Chirp pulse carrier with N/one of the frequency sweep cycle of local Chirp pulse carrier (N for greater than 2 positive integer);
(2) after each frequency sweep cycle phase place adjustment, keep several frequency sweep cycles, detect the intensity of the output signal of narrowband intermediate frequency filter (43) during this period;
(3) the frequency sweep cycle phase place that local Chirp pulse carrier is produced the local Chirp pulse carrier of circuit (41) output is adjusted N time to direction leading or that lag behind;
(4) by the intensity detection result of the output signal of narrowband intermediate frequency filter (41) in this N time phase place adjustment process of comparison, the position of the phase place (when the 5th phase place is as shown in Figure 5 adjusted) of maximum of intensity as the frequency sweep cycle synchronous error minimum of local Chirp pulse carrier will appear;
(5) the frequency sweep cycle phase place that local scanning frequency pulse is produced the local Chirp pulse carrier of circuit (41) output is adjusted on the phase position of frequency sweep cycle synchronous error minimum, realizes that the frequency sweep cycle of local Chirp pulse carrier is synchronous.
In actual applications, in order to improve the reliability of initial synchronisation, above-mentioned initial synchronization can be repeated several times and judge the position of real local Chirp pulse carrier frequency sweep cycle synchronous error minimum according to the synchronous detecting result of statistics.
Tracking phase after initial synchronisation is set up also can copy above-mentioned method for synchronous to realize that the frequency sweep cycle of local Chrp pulse carrier keeps synchronously.At tracking phase, can adopt the frequency sweep cycle phase place littler to adjust the stepping amount than the initial synchronisation stage, near frequency sweep cycle phase place traversal formula desirable sync bit of local Chirp pulse carrier is adjusted, the position of the phase position of maximum of intensity as the frequency sweep cycle synchronous error minimum of local Chirp pulse carrier appears in the output signal with narrowband intermediate frequency filter (41) equally, the frequency sweep cycle phase place that local scanning frequency pulse is produced the local Chirp pulse carrier of circuit (41) output is adjusted on the position of frequency sweep cycle synchronous error minimum then, thereby the frequency sweep cycle of realizing the local Chirp pulse carrier of tracking phase keeps synchronously.

Claims (8)

1. FM/Chirp combination frequency modulation system, partly be made up of make a start modulation and receiving end demodulation two, the modulation of making a start is to treat that modulating baseband signal carries out the formed combination frequency modulated carrier of secondary frequency modulation(FM) as signal of communication to a frequency modulation(FM) carrier wave; The receiving end demodulation is a frequency modulation(FM) carrier wave to be carried out according to the modulating baseband signal for the treatment of that comprises in the combination frequency modulated carrier that receives the additional frequency change rule of a frequency modulation(FM) carrier wave of giving recovers the reduction sample for the treatment of modulating baseband signal in the secondary frequency modulation procedure; It is characterized in that:
A described frequency modulation(FM) carrier wave is the Chirp pulse carrier;
The described modulating baseband signal of will treating carries out the secondary frequency modulation(FM) to a frequency modulation(FM) carrier wave, adds when the frequency change rule of giving a frequency modulation(FM) carrier wave is identical with employing treats that modulating baseband signal is modulated by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types additional identical to the frequency change rule of sinusoidal carrier in this process;
The modulating baseband signal for the treatment of that comprises in the combination frequency modulated carrier that described basis receives carries out to frequency modulation(FM) carrier wave that the additional frequency change rule of a frequency modulation(FM) carrier wave of giving recovers the reduction sample for the treatment of modulating baseband signal in the secondary frequency modulation procedure, its implementation procedure is: handle by relevant despreading and remove the frequency sweep rule that comprises in the combination frequency modulated carrier that receives, adopt the frequency demodulation processing of the frequency modulation(FM) mode of secondary frequency modulation(FM) institute corresponding types to recover the reduction sample for the treatment of modulating baseband signal from relevant despreading result.
2. FM/Chirp combination frequency modulation system according to claim 1, it is characterized in that: described Chirp pulse carrier as a frequency modulation(FM) carrier wave, the frequency sweep cycle length that it uses meets the following conditions: when treating modulating baseband signal as analog signal, frequency sweep cycle length is less than the single Cycle Length for the treatment of the highest effective frequency component in the modulating baseband analog signal; When treating that modulating baseband signal is digital signal, frequency sweep cycle length is less than the single duration length for the treatment of the modulating baseband numeric code.
3. FM/Chirp combination frequency modulation system according to claim 1, it is characterized in that: described Chirp pulse carrier, the frequency sweep rule of its use as a frequency modulation(FM) carrier wave have dull rise, the dull two kinds of citation forms and of descending by the combining forms of these two kinds of citation forms through being spliced to form.
4. FM/Chirp combination frequency modulation system according to claim 3, it is characterized in that: described Chirp pulse carrier as a frequency modulation(FM) carrier wave, dullness in its frequency sweep rule rises and dull decline changes, can change by linearity or nonlinear rules, can change by continuous or step-type mode.
5. the modulator approach of the modulated process of realizing making a start in the described FM/Chirp combination frequency of claim 1 modulation system, obtain the FM modulated carrier with treating that modulating baseband signal is modulated by the FM modulation system offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types, this FM modulated carrier and another road carrier wave are carried out mixing, extract in the mixing output with frequently or difference frequency component as FM/Chirp modulated carrier as signal of communication; It is characterized in that:
Described another road carrier wave is the Chirp pulse carrier; Described FM/Chirp modulated carrier as signal of communication, the frequency sweep rule of its actual use is: in extracting mixing output with frequency component as the FM/Chirp modulated carrier of signal of communication the time, use be and the identical frequency sweep rule of the employed frequency sweep rule of Chirp pulse carrier; When the difference frequency component conduct in extracting mixing output is used as the FM/Chirp modulated carrier of signal of communication, if the centre frequency of FM modulated carrier is lower than the centre frequency of Chirp pulse carrier, what then use is and the identical frequency sweep rule of the employed frequency sweep rule of Chirp pulse carrier; If the centre frequency of FM modulated carrier is higher than the centre frequency of Chirp pulse carrier, what then use is frequency sweep rule with the complementation of the employed frequency sweep rule of Chirp pulse carrier.
6. make a start in the subclass FM/S-Chirp combination frequency modulation system that a kind is realized the described FM/Chirp combination frequency of the claim 1 modulation system modulator approach of modulated process adopts numerical frequency synthetic (DDS) to produce the FM/S-Chirp modulated carrier; It is characterized in that: the frequency tuning word (FTW) in the numerical frequency building-up process is according to the centre frequency (f of S-Chirp pulse carrier 0), the stepping frequency change rule (μ (t)) of S-Chirp pulse carrier and treat that the frequency change rule (Ω (t)) that modulating baseband signal forms when carrying out frequency modulation(FM) by the frequency modulation(FM) mode offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types determines jointly, that is:
(1) according to the centre frequency (f of S-Chirp pulse carrier 0) obtain the median (FTW of frequency tuning word 0), obtain frequency sweep modulating frequency changing value (FTW with plus or minus value according to the stepping frequency change rule (μ (t)) of S-Chirp pulse carrier μ(t)), according to treating that frequency change rule Ω (t) that the frequency modulation(FM) mode offset of sinusoidal carrier wave of modulating baseband signal by secondary frequency modulation(FM) institute corresponding types forms when carrying out frequency modulation(FM) obtains the frequency modulation(FM) frequency change value (FTW with plus or minus value Ω(t));
(2) the frequency tuning word (FTW) that is used to produce the FM/S-Chirp modulated carrier is the median (FTW of frequency tuning word 0), frequency sweep modulating frequency changing value (FTW μAnd frequency modulation(FM) frequency change value (FTW (t)) Ω(t)) sum, i.e. FTW=FTW 0+ FTW μ(t)+FTW Ω(t);
(3), produce the amplitude value sequence of the sinusoidal carrier waveform of FM/S-Chirp modulated carrier on each step frequency by numerical frequency synthetic (DDS) according to the value of frequency tuning word (FTW).
7. the method that relevant despreading is handled in the receiving end demodulating process of realizing the described FM/Chirp combination frequency of claim 1 modulation system, the FM/Chirp modulated carrier and the local carrier that receive are carried out mixing, extract in the output of mixing with frequently or difference frequency component as relevant despreading result, it is characterized in that:
Described local carrier is local Chirp pulse carrier, Chirp pulse carrier employed frequency sweep rule in this this locality meets the following conditions: when the difference frequency component in the output of extracting mixing as relevant despreading as a result the time, the frequency sweep rule that comprises in the frequency sweep rule of local Chirp pulse carrier and the FM/Chirp modulated carrier that receives is identical and frequency sweep cycle is synchronous; When in the output of extracting mixing with frequency component as relevant despreading as a result the time, the complementation of frequency sweep rule and the frequency sweep cycle that comprise in the frequency sweep rule of local Chirp pulse carrier and the FM/Chirp modulated carrier that receives are synchronous.
One kind with the receiving end demodulation of the described FM/Chirp combination frequency of the described realization of claim 7 claim 1 modulation system partly in the matching used local Chirp pulse carrier frequency sweep cycle method for synchronous of method of relevant despreading processing, its content is: adopt narrowband intermediate frequency filtering extract in the mixing output with frequency component or difference frequency component, the bandwidth of narrowband intermediate frequency filtering equals to make a start and treats the shared bandwidth of FM modulated carrier that modulating baseband signal is obtained when carrying out frequency modulation(FM) by the FM modulation system offset of sinusoidal carrier wave of secondary frequency modulation(FM) institute corresponding types in the modulated process; Frequency sweep cycle phase place traversal formula in necessarily between phase region of local Chirp pulse carrier is adjusted; On each phase position, keep several frequency sweep cycles, detect the intensity of the output signal of narrowband intermediate frequency filtering during this period; Relatively the intensity of the output signal of narrowband intermediate frequency filtering on different phase positions will the position of the frequency sweep cycle phase position of intensity maximum as the frequency sweep cycle synchronous error minimum of local Chirp pulse carrier occur.
CN201110041059.1A 2010-05-07 2011-02-21 FM/Chirp composite frequency modulation mode and implementation method thereof Expired - Fee Related CN102238120B (en)

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