CN116015322A - Multi-system airborne telemetry transmitting system and method - Google Patents
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Abstract
The invention provides a multi-system airborne telemetry transmitting system and a method, wherein the transmitting system comprises an interface unit, an FPGA module and a quadrature modulation unit; the interface unit receives the PCM signal with self-adaptive code rate; the baseband modulation unit is used for carrying out continuous phase modulation on the PCM signal and comprises a PCM/FM modulation unit and a shaping offset quadrature phase shift keying modulation unit, the PCM/FM modulation unit is used for carrying out PCM/FM modulation on the PCM signal, the shaping offset quadrature phase shift keying modulation unit is used for carrying out shaping offset quadrature phase shift keying modulation on the PCM signal, and the baseband modulation unit uses time division multiplexing of the signals; the quadrature modulation unit is used for converting modulated data into analog signals through a digital domain, and performing zero intermediate frequency orthogonal up-conversion modulation on the analog signals to obtain radio frequency signals with preset wave bands, so that the real-time data transmission rate requirement and the compatibility requirement of various modulation systems can be met.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a multi-system airborne telemetry transmitting system and method.
Background
In the field of aviation flight test, in order to ensure the safety of the flight test, a real-time monitoring system for remotely measuring parameters affecting the flight safety to the ground is required, and due to the characteristics of the aviation flight test, the remote measurement real-time monitoring is required to meet the higher real-time data transmission rate and also required to meet various requirements of a receiving and transmitting end on data processing.
Along with the increasing requirement of telemetry real-time monitoring on the transmission rate of real-time data, the traditional code modulation system has become a bottleneck for restricting the improvement of the data transmission rate, a telemetry transmission system needs to be designed, the increasing requirement of the real-time data transmission rate can be met, the traditional telemetry signal is compatible to be processed, and no corresponding technical scheme exists in the prior art.
Disclosure of Invention
The invention solves the problem of how to enable an airborne telemetry transmission system to be compatible with different signal coding modulation systems.
In order to solve the above problems, in a first aspect, the present invention provides a multi-body airborne telemetry transmission system, which includes an interface unit, an FPGA module, and a quadrature modulation unit;
the interface unit is used for completing the self-adaptive PCM signal of the receiving code rate;
the FPGA module comprises a baseband modulation unit, wherein the baseband modulation unit is used for continuously modulating the phase of the PCM signal, the baseband modulation unit comprises a PCM/FM modulation unit and a shaping offset quadrature phase shift keying modulation unit, the PCM/FM modulation unit is used for carrying out PCM/FM modulation on the PCM signal, the shaping offset quadrature phase shift keying modulation unit is used for carrying out shaping offset quadrature phase shift keying modulation on the PCM signal so as to obtain modulated data, and the baseband modulation unit is used for realizing time division multiplexing of signals generated by the PCM/FM modulation unit and signals generated by the shaping offset quadrature phase shift keying modulation unit through a software radio architecture;
the quadrature modulation unit is used for converting the modulated data into an analog signal through a digital domain, and performing zero intermediate frequency orthogonal up-conversion modulation on the analog signal to obtain a preset band radio frequency signal.
Compared with the prior art, in terms of hardware, the invention uses a software radio architecture in an FPGA module, so that the FPGA module uses software as a center, and an input digital PCM signal is represented by a continuous phase modulation system through the FPGA module, so that the modulation of a PCM/FM signal and a shaping offset quadrature phase shift keying signal and the time division multiplexing of the two signals can be realized on the same platform, the traditional modulation system can be met, and the shaping offset quadrature phase shift keying modulation can be realized, so that the compatibility is solved, and the requirements of real-time data transmission rate, high power efficiency and high frequency efficiency modulation are met; in the aspect of signal modulation, a digital domain signal is converted into an analog signal through a quadrature modulation unit, zero intermediate frequency quadrature up-conversion modulation is carried out on the analog signal, a continuous phase modulation signal is output, the constant envelope characteristic of the modulated signal is ensured to be very little influenced by the nonlinearity of the system, and frequency spectrum broadening is not generated, so that the system can be ensured to have high power efficiency and frequency band efficiency. The telemetry system formed by the software radio architecture and the continuous phase modulation system can flexibly load and select the telemetry signal modulation system according to telemetry task requirements, hardware equipment is not required to be replaced, and the requirements of real-time data transmission rate and compatibility of various modulation systems can be met without replacing system connection.
Optionally, the interface unit includes an interface chip with an isolated power supply, where a receiving end and a transmitting end of the interface chip are wired in a differential pair mode, and an equal-length design and an impedance matching design are performed, and positive and negative ends of the receiving end are electrically connected with a pull-up resistor and a pull-down resistor respectively.
Optionally, said PCM/FM modulating said PCM signal comprises:
carrying out pre-shaping filtering on the PCM signal to obtain a first modulation signal;
and integrating the first modulation signal, and taking sine and cosine of the integrated signal to obtain a first orthogonal component and a first in-phase component, wherein the modulated data comprises the first orthogonal component and the first in-phase component.
Optionally, the performing the shape-shift quadrature phase shift keying modulation on the PCM signal includes:
pre-coding the PCM signal, and converting a binary sequence of the PCM signal into a ternary transmission sequence;
performing shaping filtering on the ternary transmission sequence to obtain a first result;
and respectively performing frequency modulation and phase modulation on the first result based on preset parameters to obtain a second quadrature component and a second in-phase component, wherein the modulated data comprises the second quadrature component and the second in-phase component.
Optionally, said PCM/FM modulating said PCM signal comprises:
pre-filtering the PCM signal through a digital FIR filter, eliminating a high-frequency component of the PCM signal, and obtaining a second modulation signal;
and carrying out orthogonal decomposition on the second modulation signal through a digital waveform synthesis technology to respectively obtain the first orthogonal component and the first in-phase component, wherein the modulated data comprises the first orthogonal component and the first in-phase component.
Optionally, the first orthogonal component and the first in-phase component are expressed as:
wherein ,
representing said first in-phase component, +.>
Representing the first quadrature component, +.>
Representing the amplitude of the carrier wave,
representing carrier angular frequency, +.>
Representing modulation index>
Representing the first modulated signal.
Optionally, the shaping offset quadrature phase shift keying modulation of the PCM signal further comprises:
determining a phase function required for shaping the offset quadrature phase shift keying modulation according to the pulse phase function;
determining a time domain expression of a shaping offset quadrature phase shift keying modulation signal through a continuous phase modulation waveform according to a preset shaping offset quadrature phase shift keying modulation index and the phase function, and determining the second quadrature component and the second in-phase component according to the time domain expression;
wherein the pulse phase function is expressed as:
wherein ,
representing the pulse phase function,/->
Representing the frequency pulse shaping function, L representing the phase constraint length, T representing the bit period, and T representing time.
Alternatively, the time domain expression of continuous phase modulation is expressed as:
wherein S (t) representsThe time domain representation of the modulated data, E representing the unit bit energy, T representing the unit bit period, T representing the time,
representing carrier signal frequency, < >>
Representing the initial phase of the signal->
Representing a phase function for representing the phase parameter of the time-varying carrier signal which has carried the information, h representing the modulation index,/->
Representing M-ary sequence, ">
Representing the frequency pulse shaping function.
Optionally, the multi-body airborne telemetry transmission system further comprises a power amplification unit, wherein the power amplification unit comprises a directional coupler;
the power amplifying unit is used for amplifying the radio frequency signal to power required by transmission;
the directional coupler is used for detecting the signal power amplified by the power amplifying unit and judging the transmitting working state.
On the other hand, the invention also provides a multi-system airborne telemetry transmitting method which is applied to the multi-system airborne telemetry transmitting system, and the multi-system airborne telemetry transmitting method comprises the following steps:
obtaining an input signal;
determining a modulation system of a radio frequency signal, wherein the modulation system comprises a PCM/FM system and a shaping offset quadrature phase shift keying system;
determining a modulation flow of a baseband modulation unit according to the modulation system;
when the modulation system is the PCM/FM system, pre-filtering and in-phase quadrature modulation are sequentially carried out on the input signal, zero intermediate frequency orthogonal up-conversion modulation is carried out on the input signal, first modulated data are obtained, zero intermediate frequency orthogonal up-conversion modulation is carried out on the first modulated data, and radio frequency signals of preset wave bands are obtained;
when the modulation system is the shaping offset quadrature phase shift keying system, pre-coding, shaping filtering and in-phase quadrature modulation are sequentially carried out on the input signal, zero intermediate frequency quadrature up-conversion modulation is carried out on the input signal, second modulated data is obtained, zero intermediate frequency quadrature up-conversion modulation is carried out on the second modulated data, and the radio frequency signal of the preset wave band is obtained.
Compared with the prior art, the multi-system airborne telemetry transmission method has the same beneficial effects as the multi-system airborne telemetry transmission system, and is not described in detail herein.
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FIG. 1 is a system block diagram of a multi-body airborne telemetry transmitter system in accordance with an embodiment of the present invention;
FIG. 2 is another system block diagram of a multi-body onboard telemetry transmission system in accordance with an embodiment of the present invention;
FIG. 3 is a block flow diagram of a PCM/FM modulation unit of a multi-body airborne telemetry transmission system according to an embodiment of the present invention;
fig. 4 is a block flow diagram of a shaped-offset quadrature phase shift keying modulation unit of a multi-body airborne telemetry transmission system in accordance with an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. While the invention is susceptible of embodiment in the drawings, it is to be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided to provide a more thorough and complete understanding of the invention. It should be understood that the drawings and embodiments of the invention are for illustration purposes only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "alternative embodiments". Related definitions of other terms will be given in the description below. It should be noted that the terms "first," "second," and the like herein are merely used for distinguishing between different devices, modules, or units and not for limiting the order or interdependence of the functions performed by such devices, modules, or units.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.
As shown in FIG. 1, the multi-system airborne telemetry transmission system provided by an embodiment of the invention comprises an interface unit, an FPGA module, a quadrature modulation unit and a power amplification unit, wherein the interface unit
The interface unit is used for completing the self-adaptive PCM signal of the receiving code rate;
the FPGA module comprises a baseband modulation unit, wherein the baseband modulation unit is used for continuously modulating the phase of the PCM signal, the baseband modulation unit comprises a PCM/FM modulation unit and a shaping offset quadrature phase shift keying modulation unit, the PCM/FM modulation unit is used for carrying out PCM/FM modulation on the PCM signal, the shaping offset quadrature phase shift keying modulation unit is used for carrying out shaping offset quadrature phase shift keying modulation on the PCM signal so as to obtain modulated data, and the baseband modulation unit is used for realizing time division multiplexing of signals generated by the PCM/FM modulation unit and signals generated by the shaping offset quadrature phase shift keying modulation unit through a software radio architecture;
the quadrature modulation unit is used for converting the modulated data into an analog signal through a digital domain, and performing zero intermediate frequency orthogonal up-conversion modulation on the analog signal to obtain a preset band radio frequency signal;
the power amplifying unit is used for amplifying the radio frequency signal to power required by transmission.
In one embodiment, as shown in fig. 1, modulation of input baseband PCM data and zero intermediate frequency quadrature up-conversion are completed by an on-board digital transmitter in a multi-body on-board telemetry transmission system, and a CPM radio frequency signal is output, wherein the baseband PCM data is obtained through an interface unit, and is transmitted to an FPGA module for signal modulation, wherein the baseband PCM data includes a PCM signal and a PCM clock. After receiving the baseband PCM data, the FPGA module processes the baseband PCM data, including scrambling, pattern conversion or modulation, and outputs quadrature component (Q) and in-phase component (I) to the quadrature modulation unit, and then the quadrature modulation unit completes digital-to-analog conversion (DAC) of the quadrature component and in-phase component, and the PLL (phase locked loop phase locked loop) unifies the frequencies of the quadrature component and in-phase component after digital-to-analog conversion, performs zero intermediate frequency quadrature up-conversion modulation on the quadrature component and in-phase component, outputs a modulated telemetry signal of a preset band, and performs power amplification by the power amplification unit, and then performs signal transmission.
The service component architecture (SCA, service Component Architecture) is a brand new software architecture concept.
Optionally, the preset band includes a C band having a frequency band of 4.0-8.0 GHz.
Compared with the prior art, in terms of hardware, the invention uses a software radio architecture in an FPGA module, so that the FPGA module uses software as a center, and an input digital PCM signal is represented by a continuous phase modulation system through the FPGA module, so that the modulation of a PCM/FM signal and a shaping offset quadrature phase shift keying signal and the time division multiplexing of the two signals can be realized on the same platform, the traditional modulation system can be met, the shaping offset quadrature phase shift keying modulation can be realized, the compatibility is solved, and the requirements of real-time data transmission rate, high power efficiency and high frequency efficiency modulation are met; in the aspect of signal modulation, a digital domain signal is converted into an analog signal through a quadrature modulation unit, zero intermediate frequency quadrature up-conversion modulation is carried out on the analog signal, a continuous phase modulation signal is output, the constant envelope characteristic of the modulated signal is ensured to be very little influenced by the nonlinearity of the system, and frequency spectrum broadening is not generated, so that the system can be ensured to have high power efficiency and frequency band efficiency. The telemetry system formed by the software radio architecture and the continuous phase modulation system can flexibly load and select the telemetry signal modulation system according to telemetry task requirements, hardware equipment is not required to be replaced, and the requirements of real-time data transmission rate and compatibility of various modulation systems can be met without replacing system connection.
Optionally, the quadrature modulation unit converts the baseband quadrature signal and the in-phase signal into an analog quadrature signal and an analog in-phase signal through digital-analog conversion, and completes the synthesis of the I/Q signal and zero intermediate frequency quadrature up-conversion, and then outputs a radio frequency signal after processing by gain control, filtering and the like. The quadrature modulation unit realizes direct synthesis of baseband digital signals, finally outputs radio frequency signals, and converts analog up-conversion operation of a traditional architecture into a digital domain.
Optionally, the interface unit includes an interface chip with an isolated power supply, where a receiving end and a transmitting end of the interface chip are wired in a differential pair mode, and an equal-length design and an impedance matching design are performed, and positive and negative ends of the receiving end are electrically connected with a pull-up resistor and a pull-down resistor respectively.
In one embodiment, the interface unit is converted to an RS422 interface circuit by an RS422 interface chip. The wiring form of the RS422 interface, which is transmitted and received on the PCB, is a differential pair form, and the equal-length design and the impedance matching design are carried out on the transmission and the reception during wiring, so that the transmission quality of signals is ensured; the positive end and the negative end of the receiving end of the RS422 are connected with a 100 ohm load resistor in a bridging mode, and the resistance value of the positive end and the negative end of the receiving end is 1k ohm, so that a certain high-level signal is ensured when the input of the receiving system is suspended.
Preferably, the model of the RS422 interface chip is ADM2582EBRWZ, and the RS422 interface chip is an interface chip with an isolated power supply.
Optionally, as shown in fig. 3, the PCM signal is PCM/FM modulated, including:
carrying out pre-shaping filtering on the PCM signal to obtain a first modulation signal;
and integrating the first modulation signal, and taking sine and cosine of the integrated signal to obtain a first orthogonal component and a first in-phase component, wherein the modulated data comprises the first orthogonal component and the first in-phase component.
Continuous phase modulation (CPM, continue Phase Modulation) is a phase modulation technique, which has the characteristic of continuous phase, has excellent spectral characteristics, and has a higher frequency band utilization rate than PSK modulation.
In an embodiment, the PCM signal is modulated by a PCM/FM modulation unit, wherein the time domain expression of the FM modulation signal is:
wherein ,
representing carrier amplitude +.>
Representing carrier angular frequency, +.>
Representing modulation index>
Representing the modulated signal because the signal frequency is a time-domain derivative of the signal phase, the phase of the modulated signal is proportional to the modulated signal +>
The frequency of the modulated signal is also proportional to +.>
Is a function of the integral of (a).
The trigonometric function after expansion is expressed as:
as can be seen from the above, when FM is implemented, the modulated signal is integrated, and then the integrated signal is respectively sine and cosine, to obtain a first quadrature component and a first in-phase component required by quadrature modulation, which are expressed as:
wherein ,
representing said first in-phase component, +.>
Representing the first quadrature component, +.>
Representing the amplitude of the carrier wave,
representing carrier angular frequency, +.>
Representing modulation index>
Representing the first modulated signal.
Optionally, said PCM/FM modulating said PCM signal comprises:
pre-filtering the PCM signal through a digital FIR filter, eliminating a high-frequency component of the PCM signal, and obtaining a second modulation signal;
and carrying out orthogonal decomposition on the second modulation signal through a digital waveform synthesis technology to respectively obtain the first orthogonal component and the first in-phase component, wherein the modulated data comprises the first orthogonal component and the first in-phase component.
In an embodiment, in the process of realizing the digitization of the PCM/FM modulation, the PCM signal first filters out the high-frequency component through a pre-tuning filter, and in this embodiment, in order to realize the full-digital design of the system and further meet the requirements of the software radio architecture, the pre-tuning filter is realized by adopting a digital FIR filter, and the baseband modulation signal m (t) is subjected to quadrature decomposition by utilizing a digital waveform synthesis technology, so as to obtain an in-phase component and a quadrature component.
Optionally, as shown in fig. 4, the performing the shapen offset quadrature phase shift keying modulation on the PCM signal includes:
pre-coding the PCM signal, and converting a binary sequence of the PCM signal into a ternary transmission sequence;
performing shaping filtering on the ternary transmission sequence to obtain a first result;
and respectively performing frequency modulation and phase modulation on the first result based on preset parameters to obtain a second quadrature component and a second in-phase component, wherein the modulated data comprises the second quadrature component and the second in-phase component.
In an embodiment, the shaping offset quadrature phase shift keying modulation unit is used for shaping offset quadrature phase shift keying modulation, so that the processes of PCM (pulse code modulation) reception, data precoding, shaping filtering, I/Q (input/output) modulation and the like are mainly realized, and a second quadrature component and a second in-phase component are obtained.
Where h denotes the modulation index, h=1/2,
and (3) representing the ternary information sequence, and forming the binary sequence converted into a ternary transmission sequence after the offset quadrature phase shift keying modulation precoding is completed.
The main parameters of PCM-FM (ARTM Tier 0) and SOQPSK-TG (ARTM Tier I) modulation are set as follows:
| Tier | M | symbol mapping | Modulation index | Pulse shaping | 99.9%BW |
| 0 | 2 | {-1,+1} | 0.7 | 3 dB bandwidth=0.7 rate | Rate of code 2.03 |
| I | 3 | {-1,0,+1} | 0.5 | Raised cosine filtering | Code rate of 0.98% |
Alternatively, the shaped-offset quadrature phase shift keying modulation referred to by the present invention is SOQPSK-TG modulation.
Optionally, the main parameter settings of the SOQPSK-TG modulated signal include:
h=0.5。
optionally, the shaping offset quadrature phase shift keying modulation of the PCM signal further comprises:
determining a phase function required for shaping the offset quadrature phase shift keying modulation according to the pulse phase function;
determining a time domain expression of a shaping offset quadrature phase shift keying modulation signal through a continuous phase modulation waveform according to a preset shaping offset quadrature phase shift keying modulation index and the phase function, and determining the second quadrature component and the second in-phase component according to the time domain expression;
wherein the pulse phase function is expressed as:
wherein ,
representing the pulse phase function,/->
Representing the frequency pulse shaping function, L representing the phase constraint length, T representing the bit period, and T representing time.
Alternatively, the time domain expression of continuous phase modulation is expressed as:
wherein S (T) represents a time domain expression of the modulated data, E represents a unit bit energy, T represents a unit bit period, T represents time,
representing carrier signal frequency, < >>
Representing the initial phase of the signal->
Representing a phase function for representing the phase parameter of the time-varying carrier signal which has carried the information, h representing the modulation index,/->
Representing M-ary sequence, ">
Representing the frequency pulse shaping function.
Optionally, as shown in fig. 2, the multi-body airborne telemetry transmission system further includes a power amplification unit, where the power amplification unit includes a directional coupler;
the input end of the power amplification unit is in communication connection with the quadrature modulation unit, and the power amplification unit is used for amplifying the radio frequency signal to the power required by transmission;
the directional coupler is used for detecting the signal power amplified by the power amplifying unit and judging the transmitting working state of the transmitting system.
The power amplifying unit is mainly used for amplifying the radio frequency signals after digital synthesis to a level signal which is large enough to push the final power output of the power amplifier, and mainly comprises a power amplifying unit, a power supply and monitoring unit, a structure, a heat dissipation system and the like.
Alternatively, the two-channel multi-system telemetry signal modulation output is implemented by two sets of ASICs (application specific integrated circuits).
Another embodiment of the present invention provides a multi-body airborne telemetry transmission method, including:
obtaining an input signal;
determining a modulation system of a radio frequency signal, wherein the modulation system comprises a PCM/FM system and a shaping offset quadrature phase shift keying system;
determining a modulation flow of a baseband modulation unit according to the modulation system;
when the modulation system is the PCM/FM system, pre-filtering and in-phase quadrature modulation are sequentially carried out on the input signal, zero intermediate frequency orthogonal up-conversion modulation is carried out on the input signal, first modulated data are obtained, zero intermediate frequency orthogonal up-conversion modulation is carried out on the first modulated data, and radio frequency signals of preset wave bands are obtained;
when the modulation system is the shaping offset quadrature phase shift keying system, pre-coding, shaping filtering and in-phase quadrature modulation are sequentially carried out on the input signal, zero intermediate frequency quadrature up-conversion modulation is carried out on the input signal, second modulated data is obtained, zero intermediate frequency quadrature up-conversion modulation is carried out on the second modulated data, and the radio frequency signal of the preset wave band is obtained.
A further embodiment of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a signal modulation method for a multi-body on-board telemetry transmission system as described above.
An electronic device that can be a server or a client of the present invention will now be described, which is an example of a hardware device that can be applied to aspects of the present invention. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
The electronic device includes a computing unit that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) or a computer program loaded from a storage unit into a Random Access Memory (RAM). In the RAM, various programs and data required for the operation of the device may also be stored. The computing unit, ROM and RAM are connected to each other by a bus. An input/output (I/O) interface is also connected to the bus.
The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like. In this application, the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present invention. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. The multi-system airborne telemetry transmitting system is characterized by comprising an interface unit, an FPGA module and a quadrature modulation unit;
the interface unit is used for completing the self-adaptive PCM signal of the receiving code rate;
the FPGA module comprises a baseband modulation unit, wherein the baseband modulation unit is used for continuously modulating the phase of the PCM signal, the baseband modulation unit comprises a PCM/FM modulation unit and a shaping offset quadrature phase shift keying modulation unit, the PCM/FM modulation unit is used for carrying out PCM/FM modulation on the PCM signal, the shaping offset quadrature phase shift keying modulation unit is used for carrying out shaping offset quadrature phase shift keying modulation on the PCM signal so as to obtain modulated data, and the baseband modulation unit is used for realizing time division multiplexing of signals generated by the PCM/FM modulation unit and signals generated by the shaping offset quadrature phase shift keying modulation unit through a software radio architecture;
the quadrature modulation unit is used for converting the modulated data into an analog signal through a digital domain, and performing zero intermediate frequency orthogonal up-conversion modulation on the analog signal to obtain a preset band radio frequency signal.
2. The multi-body airborne telemetry transmitter system of claim 1, wherein the interface unit comprises an interface chip with an isolated power supply, wherein the receiving end and the transmitting end of the interface chip are respectively wired in a differential pair mode, and are designed to have equal length and impedance matching, and the positive and negative ends of the receiving end are respectively electrically connected with a pull-up resistor and a pull-down resistor.
3. The multi-body on-board telemetry transmitter system of claim 1 or 2, wherein PCM/FM modulating the PCM signal comprises:
carrying out pre-shaping filtering on the PCM signal to obtain a first modulation signal;
and integrating the first modulation signal, and taking sine and cosine of the integrated signal to obtain a first orthogonal component and a first in-phase component, wherein the modulated data comprises the first orthogonal component and the first in-phase component.
4. A multi-body on-board telemetry transmitter system according to claim 3 wherein said shaping offset quadrature phase shift keying modulation of said PCM signal comprises:
pre-coding the PCM signal, and converting a binary sequence of the PCM signal into a ternary transmission sequence;
performing shaping filtering on the ternary transmission sequence to obtain a first result;
and respectively performing frequency modulation and phase modulation on the first result based on preset parameters to obtain a second quadrature component and a second in-phase component, wherein the modulated data comprises the second quadrature component and the second in-phase component.
5. The multi-body on-board telemetry transmitter system of claim 1 or 2, wherein PCM/FM modulating the PCM signal comprises:
pre-filtering the PCM signal through a digital FIR filter, eliminating a high-frequency component of the PCM signal, and obtaining a second modulation signal;
and carrying out orthogonal decomposition on the second modulation signal through a digital waveform synthesis technology to respectively obtain a first orthogonal component and a first in-phase component, wherein the modulated data comprises the first orthogonal component and the first in-phase component.
6. A multi-body on-board telemetry transmission system in accordance with claim 3 wherein said first quadrature component and said first in-phase component are represented as:
wherein ,
representing said first in-phase component, +.>
Representing the first quadrature component, +.>
Representing carrier amplitude +.>
Representing carrier angular frequency, +.>
Representing modulation index>
Representing the first modulated signal.
7. The multi-body on-board telemetry transmitter system of claim 4 wherein the shaping offset quadrature phase shift keying modulation of the PCM signal further comprises:
determining a phase function required for shaping the offset quadrature phase shift keying modulation according to the pulse phase function;
determining a time domain expression of a shaping offset quadrature phase shift keying modulation signal through a continuous phase modulation waveform according to a preset shaping offset quadrature phase shift keying modulation index and the phase function, and determining the second quadrature component and the second in-phase component according to the time domain expression;
wherein the pulse phase function is expressed as:
wherein ,
representing the pulse phase function,/->
Representing the frequency pulse shaping function, L representing the phase constraint length, T representing the bit period, and T representing time.
8. The multi-body on-board telemetry transmitter system of claim 1, wherein the continuous phase modulated time domain expression is expressed as:
wherein S (T) represents a time domain expression of the modulated data, E represents a unit bit energy, T represents a unit bit period, T represents time,
representing carrier signal frequency, < >>
Representing the initial phase of the signal->
Representing a phase functionFor representing the phase parameter of the time-varying carrier signal which has carried the information, h represents the modulation index, +.>
Representing M-ary sequence, ">
Representing the frequency pulse shaping function.
9. The multi-body airborne telemetry transmission system of claim 1 further comprising a power amplification unit, said power amplification unit comprising a directional coupler;
the power amplifying unit is used for amplifying the radio frequency signal to power required by transmission;
the directional coupler is used for detecting the signal power amplified by the power amplifying unit and judging the transmitting working state.
10. A multi-system on-board telemetry transmission method applied to the multi-system on-board telemetry transmission system according to any one of claims 1 to 9, comprising:
obtaining an input signal;
determining a modulation system of a radio frequency signal, wherein the modulation system comprises a PCM/FM system and a shaping offset quadrature phase shift keying system;
determining a modulation flow of a baseband modulation unit according to the modulation system;
when the modulation system is the PCM/FM system, pre-filtering and in-phase quadrature modulation are sequentially carried out on the input signal, zero intermediate frequency orthogonal up-conversion modulation is carried out on the input signal, first modulated data are obtained, zero intermediate frequency orthogonal up-conversion modulation is carried out on the first modulated data, and radio frequency signals of preset wave bands are obtained;
when the modulation system is the shaping offset quadrature phase shift keying system, pre-coding, shaping filtering and in-phase quadrature modulation are sequentially carried out on the input signal, zero intermediate frequency quadrature up-conversion modulation is carried out on the input signal, second modulated data is obtained, zero intermediate frequency quadrature up-conversion modulation is carried out on the second modulated data, and the radio frequency signal of the preset wave band is obtained.
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