CN105553914A - Method and device for dual-frequency constant envelope modulation of navigation signal - Google Patents

Abstract

The invention discloses a method and a device for dual-frequency constant envelope modulation of a navigation signal. Through the modulation method, service signals at any way and any power ratio on two sidebands are combined to one constant envelope signal to be transmitted. The modulation device comprises a single-frequency constant envelope modulator, a dual-frequency constant envelope modulator and a quadrature modulator. The single-frequency constant envelope modulator respectively modulates the service signals on the upper and lower sidebands to one constant envelope baseband signal and outputs real-part signals and imaginary-part signals of the constant envelope baseband signals of the upper and lower sidebands to the dual-frequency constant envelope modulator; the dual-frequency constant envelope modulator combines the constant envelope baseband signals of the upper and lower sidebands into one constant envelope baseband signal and outputs the real-part signal and the imaginary-part signal of the constant envelope baseband signal to the quadrature modulator, and the quadrature modulator outputs the input signal after quadrature modulation. According to the scheme, a dual-frequency signal can be transmitted through a set of transmission chains, a set of additional independent modulators and transmission chains are not needed, and any power ratio and any signal way can be achieved.

Description

A kind of dual-frequency navigation signal constant-envelope modulator approach and modulating device

Technical field

The present invention relates to technical field of satellite navigation, particularly the signal modulating method of satellite navigation system and modulating device.

Background technology

GNSS (GlobalNavigationSatelliteSystem, GPS (Global Position System)) is generally made up of satellite segments, control section and ground segment.The wherein GNSS satellite Launch Services for Foreign signal of satellite segments; The GNSS receiver process of ground segment, from the service signal of different GNSS satellite, calculates with the distance of every GNSS satellite and completes location compute, thus obtaining navigator fix service.The modulation system of the service signal that GNSS satellite is launched is the principal element affecting the obtainable service quality of ground segment GNSS receiver.

The GNSS satellite of satellite segments is strict power limited system, for improving efficiency power amplifier, general power amplifier is operated in non-linear saturation area, this must meet constant envelope condition after just requiring all service signal modulation of launching at a frequency, otherwise the distortion of envelope will cause power amplifier to produce amplitude/amplitude modulation distortion and amplitude/phase modulation distortion, the serving signal quality that serious reduction GNSS satellite is launched, therefore the permanent envelope multiplex how realizing multiple different service signal at same frequency is the key restrain condition of design service signal modulation.

Permanent envelope multiplex technology obtains extensive investigation and application, wherein launching (POCET) technology with Interplex, CASM (verified modulate equivalence with Interplex), majority vote method and the optimum angle permanent envelope based on numerical search is the permanent envelope multiplex problem that the navigation signal multiplex technique of representative can well solve multiple signal on a frequency, and the Interplex modulation as the E1 frequency of Galileo system have employed correction solves permanent envelope transmitting problem.But for the constant enveloped modulation problem of dual-frequency navigation signal, only carry out preliminary discussion.Two kinds of two-frequency signal modulation that Galileo and BeiDou system proposes respectively: AltBOC modulation and ACE-BOC modulation, the problem of solution is all how permanent envelope launches two the QPSK signals laid respectively on upper and lower two sidebands.The permanent envelope of optimum that AltBOC modulation achieves two the constant power QPSK being positioned at two sidebands is launched.ACE-BOC modulation solves the permanent envelope of any power ratio of two sidebands, two QPSK signals, four signal components and launches problem.But more broadly problem is, how to realize the constant enveloped modulation of two any power ratios of sideband arbitrary signal way, AltBOC and ACE-BOC modulation all cannot provide solution.

Double frequency constant enveloped modulation technology has a wide range of applications scene, as the B1 frequency range of dipper system, there is the smooth transition of first phase district system and the second stage of global system, cause load on star must consider backward compatibility within a period of time, namely need to broadcast first phase signal and the second stage of signal simultaneously.The B1I signal of first phase district system and B1C and the B1A signal of global system just lay respectively on two frequency bins.For another example, in gps system course of modernization, the number simultaneously broadcasting two frequency bins signal to reduce power amplifier on star was once considered.In addition, GLONASS system also once attempted the CDMA signal constant-envelope of its FDMA signal and different frequent points to launch.

Summary of the invention

For the technical problem that prior art exists, the object of this invention is to provide a kind of dual-frequency navigation signal constant-envelope modulator approach and modulating device, any way service signal on two sidebands is modulated on same carrier wave by it, realize constant signal envelope and high multiplexing efficiency, improve launch mass and the power efficiency of signal.

Technical scheme of the present invention is,

A kind of dual-frequency navigation signal constant-envelope modulator approach, comprises the following steps:

Known upper sideband needs multiplexing signal to be s _k(t), wherein k=1,2,3 ... N; Lower sideband needs multiplexing signal to be wherein j=1,2,3 ... M.

Step S1: increase intermodulation component, realize single-side belt constant enveloped modulation.

Multiplexing signal component is needed to carry out constant enveloped modulation to upper and lower sideband:

Wherein, signal s _kt the power of () is phase angle is θ _k; Signal s _kt the power of () is phase angle is iM (t) and be respectively the intermodulation component that lower sideband adds.

The method of constant enveloped modulation can adopt any permanent envelope lift-off technology of center frequency point multi signal component constant enveloped modulations such as being applicable to, particularly Interplex (multiplexing mutually), CASM (verified modulate equivalence with Interplex), majority vote method and the optimum angle permanent envelope based on numerical search to launch the navigation signal multiplex technique that (POCET) technology etc. is representative.As adopted Interplex multiplexing method, then the upper sideband constant envelope signal obtained after constant enveloped modulation is expressed as follows:

$\left\{\begin{array}{c}{s}_I\left(t\right)=\sqrt{P_I}{s}_1\left(t\right)cos\left({\mathrm{\φ}}_s\right(t\left)\right)-\sqrt{P_Q}{s}_2\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\\ s_Q\left(t\right)=\sqrt{P_Q}{s}_2\left(t\right)\cos \left({\mathrm{\φ}}_s\right(t\left)\right)+\sqrt{P_I}{s}_1\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\end{array}\right.$

Phase place wherein and power parameter are:

$\left\{\begin{array}{c}{\mathrm{\φ}}_s\left(t\right)=\underset{k=3}{\overset{N}{\Σ}}{m}_k{s}_k\left(t\right)s_{(k,j)}\left(t\right)\\ m_k={\tan }^{-1}\sqrt{\frac{P_{s_k}}{P_{s_{(k,j)}}}}\end{array}\right.$

Wherein, s _{(k, j)}t () is s ₁(t) or s ₂(t); P _ifor positive cross-channel signal power, P _qfor homophase road signal power, m _kfor determining the index of modulation that each signal power is distributed, signal s _kt the power of () is s _{(k, j)}t the power of () signal is wherein k=3,4 ... N, j=1,2.

In like manner, the lower sideband constant envelope signal obtained after constant enveloped modulation is expressed as follows:

$\left\{\begin{array}{c}{\tilde{s}}_I\left(t\right)=\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)-\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\\ {\tilde{s}}_Q\left(t\right)=\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)+\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\end{array}\right.$

In formula, phase place and power parameter are:

$\left\{\begin{array}{c}{\widetilde{\mathrm{\φ}}}_s\left(t\right)=\underset{k=3}{\overset{N}{\Σ}}{\tilde{m}}_k{\tilde{s}}_k\left(t\right){\tilde{s}}_{(k,j)}\left(t\right)\\ {\tilde{m}}_k={\tan }^{-1}\sqrt{\frac{P_{{\tilde{s}}_k}}{P_{{\tilde{s}}_{(k,j)}}}}\end{array}\right.$

Wherein, for or for positive cross-channel signal power, for homophase road signal power, for determining the index of modulation that each signal power is distributed, signal power be the power of signal is wherein k=3,4 ... M, j=1,2.

Step S2: double-side band constant enveloped modulation.

Carry out double frequency modulation respectively to upper and lower sideband constant enveloped modulation signal, the double frequency baseband signal obtained is:

$s\left(t\right)=A\left(t\right)\mathrm{sgn}\[\sin (2{\mathrm{\πf}}_{sc}t+\mathrm{\θ}(t\left)\right)\]+j\tilde{A}\left(t\right)\mathrm{sgn}\[\sin (2{\mathrm{\πf}}_{sc}t+\widetilde{\mathrm{\θ}}(t\left)\right)\]$

Wherein, sgn [] is the citation form of BOC modulation (BOC modulation and binary offset carrier modulation), f _scfor subcarrier offset frequency, the amplitude-phase parameter value in baseband signal expression formula is:

Wherein, Re [] represents real part; Im [] represents imaginary part.

Step S3: by permanent envelope baseband signal quadrature modulation to carrier wave.

The solid part signal of the permanent envelope baseband signal obtained in previous step and imaginary signals are modulated to respectively frequency identical but on two carrier waves of phase pi/2, form two modulation signals, carry a wave frequency and choose according to practical application request.Above-mentioned two modulation signals are added or subtract each other, forms the service signal of quadrature modulation to carrier wave.

The invention provides a kind of dual-frequency navigation signal constant-envelope modulating device, comprise single-frequency constant enveloped modulation device, double frequency constant enveloped modulation device, quadrature modulator.Wherein, the service signal of upper and lower two sidebands is modulated into the permanent envelope baseband signal in a road by single-frequency constant enveloped modulation device respectively, and the solid part signal of the permanent envelope baseband signal of output lower sideband and imaginary signals are to double frequency constant enveloped modulation device; The permanent envelope baseband signal of lower sideband is synthesized a permanent envelope baseband signal in road by double frequency constant enveloped modulation device, and export the solid part signal of permanent envelope baseband signal and imaginary signals to quadrature modulator, quadrature modulator exports after the signal of input is carried out quadrature modulation.Single-frequency constant enveloped modulation device and double frequency constant enveloped modulation device utilize the digital logic device with storage and computing function, the such as making such as field programmable logic array, digital signal processor.

Lower sideband single-frequency constant enveloped modulation device time of reception variable t, upper sideband needs multiplexing signal to be s _k(t) and signal power p _k, wherein k=1,2,3 ... N; Lower sideband needs multiplexing signal to be and signal power wherein j=1,2,3 ... M.S _k(t) and between uncorrelated mutually.

With Interplex constant enveloped modulation device (i.e. mutual multiplexing constant enveloped modulation device) for embodiment, upper sideband single-frequency constant enveloped modulation device and lower sideband single-frequency constant enveloped modulation device all adopt Interplex constant enveloped modulation device.

The input of known upper sideband single-frequency constant enveloped modulation device comprises signal s _k(t), signal s _kthe power of (t) phase angle θ _k, wherein k=1,2,3 ... N; Also have in addition and drive clock and time variable t; Under the driving driving clock, Interplex constant enveloped modulation device (i.e. mutual multiplexing constant enveloped modulation device), according to the power of input signal, phase place and level value, generates solid part signal and the imaginary signals of permanent envelope baseband signal according to following expression formula:

$\left\{\begin{array}{c}{s}_I\left(t\right)=\sqrt{P_I}{s}_1\left(t\right)cos\left({\mathrm{\φ}}_s\right(t\left)\right)-\sqrt{P_Q}{s}_2\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\\ s_Q\left(t\right)=\sqrt{P_Q}{s}_2\left(t\right)cos\left({\mathrm{\φ}}_s\right(t\left)\right)+\sqrt{P_I}{s}_1\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\end{array}\right.$

Phase place wherein and power parameter are:

$\left\{\begin{array}{c}{\mathrm{\φ}}_s\left(t\right)=\underset{k=3}{\overset{N}{\Σ}}{m}_k{s}_k\left(t\right)s_{(k,j)}\left(t\right)\\ m_k={\tan }^{-1}\sqrt{\frac{P_{s_k}}{P_{s_{(k,j)}}}}\end{array}\right.$

Wherein, s _{(k, j)}t () is s ₁(t) or s ₂(t); P _ifor positive cross-channel signal power, P _qfor homophase road signal power, m _kfor determining the index of modulation that each signal power is distributed, signal s _kt the power of () is s _{(k, j)}t the power of () signal is wherein k=3,4 ... N, j=1,2;

In like manner, lower sideband single-frequency constant enveloped modulation device also adopts Interplex constant enveloped modulation device; The lower sideband constant envelope signal obtained after its constant enveloped modulation is expressed as follows:

$\left\{\begin{array}{c}{\tilde{s}}_I\left(t\right)=\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)-\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\\ {\tilde{s}}_Q\left(t\right)=\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)+\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\end{array}\right.$

In formula, phase place and power parameter are:

$\left\{\begin{array}{c}{\widetilde{\mathrm{\φ}}}_s\left(t\right)=\underset{k=3}{\overset{N}{\Σ}}{\tilde{m}}_k{\tilde{s}}_k\left(t\right){\tilde{s}}_{(k,j)}\left(t\right)\\ {\tilde{m}}_k={\tan }^{-1}\sqrt{\frac{P_{{\tilde{s}}_k}}{P_{{\tilde{s}}_{(k,j)}}}}\end{array}\right.$

Wherein, for or for positive cross-channel signal power, for homophase road signal power, for determining the index of modulation that each signal power is distributed, signal power be the power of signal is wherein k=3,4 ... M, j=1,2.

Double frequency constant enveloped modulation device adopts the modulation of the binary offset carrier of plural form to carry out permanent envelope multiplex to lower sideband constant envelope signal, forms final double frequency constant enveloped modulation baseband signal.

The input of quadrature modulator is solid part signal I (t) and the imaginary signals Q (t) of double frequency constant enveloped modulation baseband signal, solid part signal I (t) and imaginary signals Q (t) carrier frequency are as required carried out quadrature modulation by quadrature modulator, export the service signal with constant envelope.

Advantageous Effects of the present invention:

The service signal of any power ratio of any way on two sidebands is synthesized a road constant envelope signal and launches by the present invention, the program makes two-frequency signal can be launched by a set of transmitting chain, do not need additionally to increase a set of independently modulator and transmitting chain, in addition, any power ratio and arbitrary signal way can also be accomplished.

A kind of dual-frequency navigation signal constant-envelope modulator approach provided by the invention, step is simple, and the permanent envelope that can realize the service signal of any power ratio of any way on two sidebands is launched.

A kind of dual-frequency navigation signal constant-envelope modulating device provided by the invention, two-frequency signal can be launched by a set of transmitting chain, do not need additionally to increase a set of independently modulator and transmitting chain, in addition, any power ratio and arbitrary signal way can also be accomplished.Simple and reliable for structure, flexibility is high, is easy to realize.

Accompanying drawing explanation

Fig. 1 is the principle process schematic diagram of a kind of dual-frequency navigation signal constant-envelope modulator approach provided by the invention;

Fig. 2 is the theory structure schematic diagram of a kind of dual-frequency navigation signal constant-envelope modulating device provided by the invention;

Permanent envelope composite signal when Fig. 3 is upper sideband 2 road signal, lower sideband 4 road signal and power ratio are planisphere.

Embodiment

Below by adopt the urban satellite navigation service signal of direct sequence spread spectrum skill for embodiment, be described in detail with reference to the attached drawings modulator approach or the modulating device of a kind of two non-equilibrium Quadrature Phase Shift Keying signal of the present invention.

Known upper sideband needs multiplexing signal to be s _k(t), wherein k=1,2,3 ... N; Lower sideband needs multiplexing signal to be wherein j=1,2,3 ... M.

Fig. 1 is the principle process schematic diagram of a kind of dual-frequency navigation signal constant-envelope modulator approach provided by the invention, and the method includes the steps of:

Step S1: need multiplexing signal component to carry out constant enveloped modulation to lower sideband, the method of constant enveloped modulation can adopt any permanent envelope lift-off technology of center frequency point multi signal component constant enveloped modulations such as being applicable to, particularly Interplex, CASM (verified modulate equivalence with Interplex), majority vote method and the optimum angle permanent envelope based on numerical search to launch the navigation signal multiplex technique that (POCET) technology etc. is representative.

Step S2: generate the permanent envelope baseband signal of double frequency.Adopt given double frequency constant enveloped modulation method, double frequency modulation is carried out to the lower sideband constant envelope signal obtained, obtain the analytical expression of the permanent envelope binary offset carrier modulation of double frequency.

Step S3: by permanent envelope baseband signal quadrature modulation to carrier wave.

Concrete method step describes in detail in summary of the invention part, is not repeating at this.

Fig. 2 is the theory structure schematic diagram of a kind of dual-frequency navigation signal constant-envelope modulating device provided by the invention, comprises single-frequency constant enveloped modulation device, double frequency constant enveloped modulation device, quadrature modulator.Lower sideband single-frequency constant enveloped modulation device time of reception variable t, upper sideband needs multiplexing signal to be s _k(t) and signal power p _k, wherein k=1,2,3 ... N; Lower sideband needs multiplexing signal to be and signal power wherein j=1,2,3 ... M.S _k(t) and between uncorrelated mutually.Adopt the permanent envelope multiplex technology of any one multi signal component in prior art, lower sideband signal is multiplexed with permanent envelope baseband signal respectively, and have the permanent envelope multiplex technology of multiple multi signal component in prior art, method is very ripe, repeats no more here.Double frequency constant enveloped modulation device adopts the modulation of the binary offset carrier of plural form to carry out permanent envelope multiplex to lower sideband constant envelope signal, forms final double frequency constant enveloped modulation baseband signal.The input of quadrature modulator is solid part signal I (t) and imaginary signals Q (t), solid part signal I (t) and imaginary signals Q (t) carrier frequency are as required carried out quadrature modulation by quadrature modulator, export the service signal with constant envelope.

Permanent envelope composite signal when Fig. 3 gives upper sideband 2 road signal, lower sideband 4 road signal and power ratio are planisphere, composite signal is now the 16PSK signal of a standard as seen.Along with the difference of power when signal number, the number of constellation point and constellation point distribution also may be different from the present embodiment.

Permanent envelope baseband signal of the present invention is multiplied by arbitrary constant, or phase look-up table is increased or reduce fixing phase angle, the modulator approach obtained and modulating device still belong to protection content of the present invention.

More than contain the explanation of the preferred embodiment of the present invention; this is to describe technical characteristic of the present invention in detail; be not want summary of the invention to be limited in the concrete form described by embodiment, other amendments carried out according to content purport of the present invention and modification are also protected by this patent.The purport of content of the present invention defined by claims, but not defined by the specific descriptions of embodiment.

Claims (5)

1. a dual-frequency navigation signal constant-envelope modulator approach, is characterized in that: comprise the following steps:

Known upper sideband needs multiplexing signal to be s _k(t), wherein k=1,2,3 ... N; Lower sideband needs multiplexing signal to be wherein j=1,2,3 ... M;

Step S1: increase intermodulation component, realize single-side belt constant enveloped modulation;

Multiplexing signal component is needed to carry out constant enveloped modulation to upper and lower sideband:

Wherein, signal s _kt the power of () is phase angle is θ _k; Signal s _kt the power of () is phase angle is iM (t) and be respectively the intermodulation component that lower sideband adds;

Adopt Interplex multiplexing method, then the upper sideband constant envelope signal obtained after constant enveloped modulation is expressed as follows:

$\left\{\begin{array}{c}{s}_I\left(t\right)=\sqrt{P_I}{s}_1\left(t\right)cos\left({\mathrm{\φ}}_s\right(t\left)\right)-\sqrt{P_Q}{s}_2\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\\ s_Q\left(t\right)=\sqrt{P_Q}{s}_2\left(t\right)\cos \left({\mathrm{\φ}}_s\right(t\left)\right)+\sqrt{P_I}{s}_1\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\end{array}\right.$

Phase place wherein and power parameter are:

$\left\{\begin{array}{c}{\mathrm{\φ}}_s\left(t\right)=\underset{k=3}{\overset{N}{\Σ}}{m}_k{s}_k\left(t\right)s_{(k,j)}\left(t\right)\\ m_k={\tan }^{-1}\sqrt{\frac{P_{s_k}}{P_{s_{(k,j)}}}}\end{array}\right.$

Wherein, s _{(k, j)}t () is s ₁(t) or s ₂(t); P _ifor positive cross-channel signal power, P _qfor homophase road signal power, m _kfor determining the index of modulation that each signal power is distributed, signal s _kt the power of () is s _{(k, j)}t the power of () signal is wherein k=3,4 ... N, j=1,2;

In like manner, the lower sideband constant envelope signal obtained after constant enveloped modulation is expressed as follows:

$\left\{\begin{array}{c}{\tilde{s}}_I\left(t\right)=\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)-\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\\ {\tilde{s}}_Q\left(t\right)=\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)+\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\end{array}\right.$

In formula, phase place and power parameter are:

$\left\{\begin{array}{c}{\widetilde{\mathrm{\φ}}}_s\left(t\right)=\underset{k=3}{\overset{M}{\Σ}}{\tilde{m}}_k{\tilde{s}}_k\left(t\right){\tilde{s}}_{(k,j)}\left(t\right)\\ {\tilde{m}}_k={\tan }^{-1}\sqrt{\frac{P_{{\tilde{s}}_k}}{P_{{\tilde{s}}_{(k,j)}}}}\end{array}\right.$

Wherein, for or for positive cross-channel signal power, for homophase road signal power, for determining the index of modulation that each signal power is distributed, signal power be the power of signal is wherein k=3,4 ... M, j=1,2;

Step S2: double-side band constant enveloped modulation

Carry out double frequency modulation respectively to upper and lower sideband constant enveloped modulation signal, the double frequency baseband signal obtained is:

$s\left(t\right)=A\left(t\right)\mathrm{sgn}\[\sin (2{\mathrm{\πf}}_{sc}t+\mathrm{\θ}(t))\]+j\tilde{A}\left(t\right)\mathrm{sgn}\[\sin (2{\mathrm{\πf}}_{sc}t+\widetilde{\mathrm{\θ}}(t))\]$

Wherein, the citation form that sgn [] modulates for binary offset carrier, f _scfor subcarrier offset frequency, the amplitude-phase parameter value in baseband signal expression formula is:

Wherein, Re [] represents real part; Im [] represents imaginary part;

Step S3: by permanent envelope baseband signal quadrature modulation to carrier wave

The solid part signal of the permanent envelope baseband signal obtained in previous step and imaginary signals are modulated to respectively frequency identical but on two carrier waves of phase pi/2, form two modulation signals; Above-mentioned two modulation signals are added or subtract each other, forms the service signal of quadrature modulation to carrier wave.

2. a dual-frequency navigation signal constant-envelope modulating device, it is characterized in that: comprise single-frequency constant enveloped modulation device, double frequency constant enveloped modulation device and quadrature modulator, single-frequency constant enveloped modulation device comprises upper sideband single-frequency constant enveloped modulation device and lower sideband single-frequency constant enveloped modulation device; The service signal of upper and lower two sidebands is modulated into a permanent envelope baseband signal in road by upper sideband single-frequency constant enveloped modulation device and lower sideband single-frequency constant enveloped modulation device respectively respectively, exports the solid part signal of the permanent envelope baseband signal of upper and lower sideband and imaginary signals respectively to double frequency constant enveloped modulation device; The permanent envelope baseband signal of upper and lower sideband is synthesized the permanent envelope baseband signal in a road by double frequency constant enveloped modulation device, export the solid part signal of permanent envelope baseband signal and imaginary signals to quadrature modulator, quadrature modulator exports after the signal of input is carried out quadrature modulation.

3. dual-frequency navigation signal constant-envelope modulating device according to claim 2, is characterized in that: upper sideband single-frequency constant enveloped modulation device time of reception variable t, upper sideband needs multiplexing signal to be s _k(t) and signal power p _k, wherein k=1,2,3 ... N; Lower sideband single-frequency constant enveloped modulation device receives lower sideband needs multiplexing signal to be and signal power wherein j=1,2,3 ... M; s _k(t) and between uncorrelated mutually;

Upper sideband single-frequency constant enveloped modulation device and lower sideband single-frequency constant enveloped modulation device all adopt mutual multiplexing constant enveloped modulation device; The input of known upper sideband single-frequency constant enveloped modulation device comprises signal s _k(t), signal s _kthe power of (t) phase angle θ _k, wherein k=1,2,3 ... N; Also have in addition and drive clock and time variable t; Under the driving driving clock, Interplex constant enveloped modulation device, according to the power of input signal, phase place and level value, generates solid part signal and the imaginary signals of permanent envelope baseband signal according to following expression formula:

$\left\{\begin{array}{c}{s}_I\left(t\right)=\sqrt{P_I}{s}_1\left(t\right)cos\left({\mathrm{\φ}}_s\right(t\left)\right)-\sqrt{P_Q}{s}_2\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\\ s_Q\left(t\right)=\sqrt{P_Q}{s}_2\left(t\right)\cos \left({\mathrm{\φ}}_s\right(t\left)\right)+\sqrt{P_I}{s}_1\left(t\right)sin\left({\mathrm{\φ}}_s\right(t\left)\right)\end{array}\right.$

Phase place wherein and power parameter are:

$\left\{\begin{array}{c}{\mathrm{\φ}}_s\left(t\right)=\underset{k=3}{\overset{N}{\Σ}}{m}_k{s}_k\left(t\right)s_{(k,j)}\left(t\right)\\ m_k={\tan }^{-1}\sqrt{\frac{P_{s_k}}{P_{s_{(k,j)}}}}\end{array}\right.$

Wherein, s _{(k, j)}t () is s ₁(t) or s ₂(t); P _ifor positive cross-channel signal power, P _qfor homophase road signal power, m _kfor determining the index of modulation that each signal power is distributed, signal s _kt the power of () is s _{(k, j)}t the power of () signal is wherein k=3,4 ... N, j=1,2;

In like manner, lower sideband single-frequency constant enveloped modulation device also adopts Interplex constant enveloped modulation device; The lower sideband constant envelope signal obtained after its constant enveloped modulation is expressed as follows:

$\left\{\begin{array}{c}{\tilde{s}}_I\left(t\right)=\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)-\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\\ {\tilde{s}}_Q\left(t\right)=\sqrt{{\tilde{P}}_Q}{\tilde{s}}_2\left(t\right)cos\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)+\sqrt{{\tilde{P}}_I}{\tilde{s}}_1\left(t\right)sin\left({\widetilde{\mathrm{\φ}}}_s\right(t\left)\right)\end{array}\right.$

In formula, phase place and power parameter are:

$\left\{\begin{array}{c}{\widetilde{\mathrm{\φ}}}_s\left(t\right)=\underset{k=3}{\overset{M}{\Σ}}{\tilde{m}}_k{\tilde{s}}_k\left(t\right){\tilde{s}}_{(k,j)}\left(t\right)\\ {\tilde{m}}_k={\tan }^{-1}\sqrt{\frac{P_{{\tilde{s}}_k}}{P_{{\tilde{s}}_{(k,j)}}}}\end{array}\right.$

Wherein, for or for positive cross-channel signal power, for homophase road signal power, for determining the index of modulation that each signal power is distributed, signal power be the power of signal is wherein k=3,4 ... M, j=1,2.

4. dual-frequency navigation signal constant-envelope modulating device according to claim 3, it is characterized in that: double frequency constant enveloped modulation device adopts the modulation of the binary offset carrier of plural form to carry out permanent envelope multiplex to lower sideband constant envelope signal, forms final double frequency constant enveloped modulation baseband signal.

5. dual-frequency navigation signal constant-envelope modulating device according to claim 4, it is characterized in that: the input of quadrature modulator is solid part signal I (t) and the imaginary signals Q (t) of double frequency constant enveloped modulation baseband signal, solid part signal I (t) and imaginary signals Q (t) carrier frequency are as required carried out quadrature modulation by quadrature modulator, export the service signal with constant envelope.