CN110138470B - Digital normalization system and method for sound measurement power of USB measurement and control responder - Google Patents

Digital normalization system and method for sound measurement power of USB measurement and control responder Download PDF

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CN110138470B
CN110138470B CN201910309248.9A CN201910309248A CN110138470B CN 110138470 B CN110138470 B CN 110138470B CN 201910309248 A CN201910309248 A CN 201910309248A CN 110138470 B CN110138470 B CN 110138470B
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CN110138470A (en
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赵赛果
徐秋锋
袁鑫
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Beijing Institute of Remote Sensing Equipment
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset

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Abstract

The invention discloses a digital normalization system and a digital normalization method for sound measurement power of a USB measurement and control transponder, wherein the method comprises the steps of carrying out low-noise amplification, down-conversion, filtering, AGC (automatic gain control) amplification or logarithmic amplification on a received signal, and outputting the signal after analog-to-digital conversion; receiving an output signal after analog-to-digital conversion to realize main carrier tracking; carrying out digital down-conversion processing on the data subjected to analog-to-digital conversion and the main carrier tracking data, and outputting; processing the output data of the digital down-conversion processing to extract a main ranging tone and a secondary ranging tone; performing real-time power estimation on the main ranging tone and the secondary ranging tone by using the integral elimination result of the main carrier frequency locking loop; and carrying out power normalization processing on the primary distance measurement sound and the secondary distance measurement sound. The method is simple to realize, solves the problem of stability of the downlink modulation degree of the USB measurement and control responder under large and small signals, and simultaneously avoids the problem of distance measurement ambiguity resolution caused by inconsistent group delay of analog sound measurement filters.

Description

Digital normalization system and method for sound measurement power of USB measurement and control responder
Technical Field
The invention relates to a sound measurement power digital normalization system and method for a USB measurement and control transponder.
Background
The S-band unified carrier system (USB) is applied to most international satellite measurement and control tasks, can provide a communication channel for a satellite and a ground and can complete satellite orbit measurement. The USB measurement and control system adopts multiple sound measurement to realize distance ambiguity resolution, and calculates the radial distance between the measurement and control station and the satellite through receiving and transmitting sound measurement phase delay measurement. The USB measurement and control transponder is signal forwarding equipment installed on a satellite, and completes distance measurement through matching of sound measurement receiving and forwarding with a measurement and control station. After the USB measurement and control responder needs to complete sound measurement demodulation and power normalization, the phase modulation is carried out on the downlink carrier according to the agreed sound measurement modulation degree requirement.
The traditional USB measurement and control responder generally uses two methods to realize sound measurement demodulation and power normalization, wherein the method comprises the steps of adopting an analog circuit to realize carrier tracking and sound measurement demodulation, utilizing an analog Automatic Gain Control (AGC) circuit to realize power normalization, and directly modulating distance measurement sound to a downlink carrier signal to form a downlink signal without filtering. In the first method, the remote control subcarrier is not filtered, so that the power distribution of a downlink channel is influenced, and the power waste is caused. And the second method is to add two paths of analog filters on the basis of the first method to respectively filter the primary and secondary sound measuring, so that the independent configuration of the up-down modulation degree can be realized, and meanwhile, the waste of the remote sound measuring on the downlink power is avoided. However, due to the difference in group delay characteristics of the two analog filters, the phase linearity of primary and secondary sound measurement is affected, and further the distance solution of the ground measurement and control station is affected, and even fuzzy errors of the distance solution are caused. In addition, the two methods only adopt an analog Automatic Gain Control (AGC) circuit to realize the power normalization of the uplink signal, the dynamic range of the AGC circuit is limited due to the double limitation of the bandwidth of an analog filter and the gain of an amplifier, and when the uplink received signal is small, the noise power in the output power of the AGC circuit occupies a large ratio, so that the modulation degree of the downlink distance measurement and sound measurement is reduced, and the action distance of a measurement and control system is influenced.
Disclosure of Invention
Aiming at the technical problems, the invention provides a digital normalization method for sound measurement power of a USB measurement and control transponder, which solves the problems of modulation power loss and modulation error during small signal input existing in the traditional analog power normalization method, avoids the deterioration of sound measurement phase linearity and is beneficial to the distance ambiguity resolution of a ground measurement and control station.
In view of this, the technical solution provided by the present invention is: a digital normalization system for sound measurement power of a USB measurement and control transponder is characterized by comprising:
the USB measurement and control responder receiver subsystem is used for realizing low-noise amplification, down-conversion, filtering, AGC (automatic gain control) amplification or logarithmic amplification of a received signal, and outputting the signal after analog-to-digital conversion;
the digital frequency-locked phase-locked loop is used for receiving the output signal after analog-to-digital conversion and realizing main carrier tracking;
the digital down-conversion unit is used for performing digital down-conversion processing on the data subjected to analog-to-digital conversion and the main carrier tracking data and outputting the data;
the extraction unit is used for processing the output of the digital down-conversion unit so as to extract a main ranging tone and a secondary ranging tone;
the estimation unit is used for carrying out real-time power estimation on the main ranging tone and the secondary ranging tone by utilizing the integral elimination result of the frequency locking loop of the main carrier;
and the output unit is used for carrying out power normalization processing on the main ranging tone and the secondary ranging tone.
Further, the USB measurement and control transponder receiver subsystem includes: the device comprises a radio frequency filter, a low noise amplifier, a frequency mixer, a local oscillator frequency source, an intermediate frequency filter, an AGC amplifier or a logarithmic amplifier, an analog-to-digital converter and a complex programmable logic device; the radio frequency filter is connected with the low noise amplifier, the mixer is connected with the low noise amplifier, the local oscillator frequency source and the intermediate frequency filter, the intermediate frequency filter is connected with the AGC amplifier or the logarithmic amplifier, one end of the analog-to-digital converter is connected with the amplifier, and the other end of the analog-to-digital converter is connected with the complex programmable logic device.
Furthermore, the digital frequency-locked phase-locked loop is composed of a frequency-locked loop digital control oscillator, two multipliers, two integral clearing units, a frequency discriminator, a frequency-locked loop filter, a phase discriminator, a phase-locked loop digital control vibrator, a phase-locked loop filter, a frequency word adder, a carrier tracking digital control oscillator and a sound measuring demodulation module which are connected with each other.
Furthermore, the extraction unit adopts two FIR filters with different center frequencies and the same order number to extract the main ranging tone and the sub ranging tone respectively.
Further, the digital down-conversion unit is also connected with a low-pass filter.
Another objective of the present invention is to provide a digital normalization method for sound measurement power of a USB measurement and control transponder, which is characterized by comprising:
carrying out low-noise amplification, down-conversion, filtering, AGC (automatic gain control) amplification or logarithmic amplification on a received signal, and outputting the signal after analog-to-digital conversion;
receiving an output signal after analog-to-digital conversion to realize main carrier tracking;
carrying out digital down-conversion processing on the data subjected to analog-to-digital conversion and the main carrier tracking data, and outputting;
processing the output data of the digital down-conversion processing to extract a main ranging tone and a secondary ranging tone;
performing real-time power estimation on the main ranging tone and the secondary ranging tone by using the integral elimination result of the main carrier frequency locking loop;
and carrying out power normalization processing on the primary distance measurement sound and the secondary distance measurement sound.
The invention achieves the following significant beneficial effects:
the realization is simple, include: the system comprises a USB measurement and control responder receiver subsystem, a digital frequency-locked phase-locked loop, a digital down-conversion unit, an extraction unit, an estimation unit and an output unit, wherein the digital frequency-locked phase-locked loop is adopted to complete carrier frequency tracking, carrier power estimation is completed by using frequency-locked loop integral to clear data, sound measurement power normalization processing is completed, meanwhile, FIR filters with the same order number are used for respectively performing digital filtering on main distance measurement sound and secondary distance measurement sound, the influence of uplink remote control sound measurement and noise on the sound measurement modulation degree is reduced to the maximum extent, and the group delay consistency of the main sound measurement and the secondary sound measurement is ensured. The problem of stability of the downlink modulation degree of the USB measurement and control responder under large and small signals is solved, and meanwhile the problem of distance measurement ambiguity resolution caused by inconsistent group delay of analog sound measurement filters is avoided.
Drawings
FIG. 1 is a schematic diagram of the hardware system structure of the USB measurement and control responder receiver according to the present invention;
FIG. 2 is a schematic diagram of a digital frequency-locked phase-locked loop according to the present invention;
FIG. 3 is a flow chart of the digital normalization method for sound measuring power of the USB measurement and control transponder.
Detailed Description
The advantages and features of the present invention will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings and detailed description of specific embodiments of the invention. It is to be noted that the drawings are in a very simplified form and are not to scale, which is intended merely for convenience and clarity in describing embodiments of the invention.
It should be noted that, for clarity of description of the present invention, various embodiments are specifically described to further illustrate different implementations of the present invention, wherein the embodiments are illustrative and not exhaustive. In addition, for simplicity of description, the contents mentioned in the previous embodiments are often omitted in the following embodiments, and therefore, the contents not mentioned in the following embodiments may be referred to the previous embodiments accordingly.
While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood that the inventors do not intend to limit the invention to the particular embodiments described, but intend to protect all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims. The same component numbers may be used throughout the drawings to refer to the same or like parts.
Referring to fig. 1 and fig. 2, the present invention provides a digital normalization system for sound measurement power of a USB measurement and control transponder, comprising: the USB measurement and control responder receiver subsystem is used for realizing low-noise amplification, down-conversion, filtering, AGC (automatic gain control) amplification or logarithmic amplification of a received signal, and outputting the signal after analog-to-digital conversion; the digital frequency-locked phase-locked loop is used for receiving the output signal after analog-to-digital conversion and realizing main carrier tracking; the digital down-conversion unit is used for performing digital down-conversion processing on the data subjected to analog-to-digital conversion and the main carrier tracking data and outputting the data; the extraction unit is used for processing the output of the digital down-conversion unit so as to extract a main ranging tone and a secondary ranging tone; the estimation unit is used for carrying out real-time power estimation on the main ranging tone and the secondary ranging tone by utilizing the integral elimination result of the frequency locking loop of the main carrier; and the output unit is used for carrying out power normalization processing on the main ranging tone and the secondary ranging tone.
Preferably, the USB measurement and control transponder receiver subsystem includes: the device comprises a radio frequency filter, a low noise amplifier, a frequency mixer, a local oscillator frequency source, an intermediate frequency filter, an AGC amplifier or a logarithmic amplifier, an analog-to-digital converter and a complex programmable logic device; the radio frequency filter is connected with the low noise amplifier, the mixer is connected with the low noise amplifier, the local oscillator frequency source and the intermediate frequency filter, the intermediate frequency filter is connected with the AGC amplifier or the logarithmic amplifier, one end of the analog-to-digital converter is connected with the amplifier, and the other end of the analog-to-digital converter is connected with the complex programmable logic device.
Preferably, the digital frequency-locked phase-locked loop comprises a frequency-locked loop digital control oscillator, two multipliers, two integral clearing units, a frequency discriminator, a frequency-locked loop filter, a phase discriminator, a phase-locked loop digital control vibrator, a phase-locked loop filter, a frequency word adder, a carrier tracking digital control oscillator and a sound measuring demodulation module which are connected with each other.
Preferably, the extraction unit extracts the primary ranging tone and the secondary ranging tone by using two FIR filters with different center frequencies and the same order.
Preferably, the digital down-conversion unit is further connected with a low-pass filter.
Referring to fig. 3, another objective of the present invention is to provide a digital normalization method for sound measurement power of a USB measurement and control transponder, which includes:
step S1, carrying out low noise amplification, down conversion, filtering, AGC amplification or logarithmic amplification on the received signal, and outputting after analog-to-digital conversion;
step S2, receiving the output signal after analog-to-digital conversion to realize the tracking of the main carrier;
step S3, carrying out digital down-conversion processing on the data after the analog-to-digital conversion and the main carrier tracking data, and outputting;
step S4, processing the output data of the digital down-conversion processing to extract a main distance measuring tone and a secondary distance measuring tone;
step S5, real-time power estimation is carried out on the main distance measurement tone and the secondary distance measurement tone by using the integral elimination result of the frequency locking loop of the main carrier;
step S6, perform power normalization processing on the primary and secondary distance-measuring tones.
The invention relates to a sound measurement power digital normalization method of a USB measurement and control responder, which comprises the following specific steps:
first step, building a USB measurement and control responder receiver system
A USB measurement and control transponder receiver system comprising: the device comprises a radio frequency filter 1, a low noise amplifier 2, a mixer 3, a local oscillation frequency source 8, an intermediate frequency filter 4, an AGC amplifier or logarithmic amplifier 5, an analog-to-digital converter 6 and a complex programmable logic device 7; the radio frequency filter 1 is connected with the low noise amplifier 2, the mixer 3 is connected with the low noise amplifier 2, the local oscillator frequency source 8 and the intermediate frequency filter 4, the intermediate frequency filter 4 is connected with the AGC amplifier or the logarithmic amplifier 5, one end of the analog-to-digital converter 6 is connected with the AGC amplifier or the logarithmic amplifier 5, and the other end of the analog-to-digital converter is connected with the complex programmable logic device 7.
After down-conversion, filtering and amplification are completed on the uplink input signal, conversion from an analog signal to a digital signal is completed, and the intermediate-frequency digital signal is handed over to the complex programmable logic device 7 for digital signal processing.
Second step digital frequency-locked phase-locked loop for realizing carrier tracking
The carrier tracking is realized by using a frequency-locked phase-locked loop, and the frequency-locked phase-locked loop consists of a frequency-locked loop digital control oscillator 7, a multiplier 1, a multiplier 2, an integral clearing unit 3, an integral clearing unit 4, a frequency discriminator 5, a frequency-locked loop filter 6, a phase discriminator 8, a phase-locked loop digital control vibrator 9, a phase-locked loop filter 10, a frequency digital adder 11, a carrier tracking digital control oscillator 12 and a sound measuring demodulation module 13.
Third step DDC realizes sound measurement demodulation
The data collected by the A/D converter and the output data of the carrier tracking digital control oscillator are processed by digital down-conversion (DDC), the processed result is filtered by a low-pass filter to extract low-frequency component, and the signal r after sound detection and demodulation is obtainedQThe mathematical expression of (n) is as follows:
Figure GDA0003000532120000071
wherein:
Prfor received signal power, n is the data stream bit number;
mR1for the uplink main ranging tone system, wR1Is the frequency of the upstream main ranging tone,
Figure GDA0003000532120000072
is the initial phase of the ascending main ranging tone;
mR2for the uplink sub-ranging tone regime, wR2For the frequency of the uplink sub ranging tone,
Figure GDA0003000532120000073
is the initial phase of the ascending secondary distance measurement sound;
mTfor remote control of tone system, dT(n) is remote control data, wTIn order to remotely control the audio frequency,
Figure GDA0003000532120000074
is the initial phase of the remote control sound;
J0is a zero order Bessel function, J1Is a first order bessel function.
Fourthly, the FIR filter finishes the extraction of the distance measurement sound
And filtering the main ranging tone and the secondary ranging tone by using two FIR band-pass filters with different center frequencies and the same order.
Filtered primary ranging tone signal r1The mathematical expression of (n) is:
Figure GDA0003000532120000081
filtered sub ranging tone signal r2The mathematical expression of (n) is:
Figure GDA0003000532120000082
fifthly, the integral elimination result of the frequency locking loop of the main carrier is utilized to complete the real-time power estimation
According to the same-phase branch signal r after the integral clearing of the main carrierImain(n) and quadrature branch signal rQmainThe mathematical expression of (n) is:
Figure GDA0003000532120000083
Figure GDA0003000532120000084
calculating the Power _ main of the main carrier receiving signal, wherein the calculation formula is as follows:
Figure GDA0003000532120000085
sixth step, the normalization process of distance measurement sound power is completed
Calculating normalized main ranging sound signal rt1(n) and a sub ranging tone signal rt2(n) the calculation formula is as follows:
Figure GDA0003000532120000086
Figure GDA0003000532120000087
step S1 is to use an analog circuit to implement low noise amplification, down conversion, filtering, AGC amplification or logarithmic amplification of the received signal, and output the signal to the complex programmable device after passing through the analog-to-digital converter. The analog circuit converts the input signal into a digital signal that can be processed by the complex programmable device while eliminating most of the dynamics of the input signal amplitude.
In step S2, a digital frequency-locked phase-locked loop is used to realize main carrier tracking, and the frequency-locked loop reduces the data processing rate through integral removal, so that the phase-locked loop improves the main carrier tracking accuracy.
In the step S4, the primary distance measuring sound filter and the secondary distance measuring sound filter adopt FIR filters with the same order, and the time delay of the primary distance measuring sound and the secondary distance measuring sound through the filters is the same, so that the phase relationship between the primary distance measuring sound and the secondary distance measuring sound is not changed, and the distance fuzzy solution of the ground measurement and control station is facilitated.
Step S5 is to perform real-time power estimation by using the frequency-locked loop integral removal result, which retains the power characteristics of the output signal and has a low data rate, thereby being beneficial to saving resources.
The invention achieves the following significant beneficial effects:
the realization is simple, include: the system comprises a USB measurement and control responder receiver subsystem, a digital frequency-locked phase-locked loop, a digital down-conversion unit, an extraction unit, an estimation unit and an output unit, wherein the digital frequency-locked phase-locked loop is adopted to complete carrier frequency tracking, carrier power estimation is completed by using frequency-locked loop integral to clear data, sound measurement power normalization processing is completed, meanwhile, FIR filters with the same order number are used for respectively performing digital filtering on main distance measurement sound and secondary distance measurement sound, the influence of uplink remote control sound measurement and noise on the sound measurement modulation degree is reduced to the maximum extent, and the group delay consistency of the main sound measurement and the secondary sound measurement is ensured. The problem of stability of the downlink modulation degree of the USB measurement and control responder under large and small signals is solved, and meanwhile the problem of distance measurement ambiguity resolution caused by inconsistent group delay of analog sound measurement filters is avoided.
Any other suitable modifications can be made according to the technical scheme and the conception of the invention. All such alternatives, modifications and improvements as would be obvious to one skilled in the art are intended to be included within the scope of the invention as defined by the appended claims.

Claims (10)

1. A digital normalization system for sound measurement power of a USB measurement and control transponder is characterized by comprising:
the USB measurement and control responder receiver subsystem is used for realizing low-noise amplification, down-conversion, filtering, AGC (automatic gain control) amplification or logarithmic amplification of a received signal, and outputting the signal after analog-to-digital conversion;
the digital frequency-locked phase-locked loop is used for receiving the output signal after analog-to-digital conversion and realizing main carrier tracking;
the digital down-conversion unit is used for performing digital down-conversion processing on the data subjected to the analog-to-digital conversion and the main carrier tracking data and outputting the data;
the extraction unit is used for processing the output of the digital down-conversion unit so as to extract a main ranging tone and a secondary ranging tone; the filtering of the main distance measuring sound and the secondary distance measuring sound is respectively finished by two FIR band-pass filters with different center frequencies and the same order number,
filtered primary ranging tone signal r1The mathematical expression of (n) is:
Figure FDA0003028547540000011
filtered sub ranging tone signal r2The mathematical expression of (n) is:
Figure FDA0003028547540000012
wherein:
Prfor received signal power, n is the data stream bit number;
mR1for the uplink main ranging tone system, wR1Is the frequency of the upstream main ranging tone,
Figure FDA0003028547540000013
is the initial phase of the ascending main ranging tone;
mR2for the uplink sub-ranging tone regime, wR2For the frequency of the uplink sub ranging tone,
Figure FDA0003028547540000014
is the initial phase of the ascending secondary distance measurement sound;
mTin order to remotely control the tone system,
Figure FDA0003028547540000015
is the initial phase of the remote control sound;
J0is a zero order Bessel function, J1Is a first order Bessel function;
the estimation unit is used for carrying out real-time power estimation on the main ranging tone and the secondary ranging tone by utilizing the integral elimination result of the frequency locking loop of the main carrier;
and the output unit is used for carrying out power normalization processing on the main ranging tone and the secondary ranging tone.
2. The USB observed and controlled transponder tone measurement power digital normalization system of claim 1, wherein said USB observed and controlled transponder receiver subsystem comprises: the device comprises a radio frequency filter, a low noise amplifier, a frequency mixer, a local oscillator frequency source, an intermediate frequency filter, an AGC amplifier or a logarithmic amplifier, an analog-to-digital converter and a complex programmable logic device; the radio frequency filter is connected with the low noise amplifier, the mixer is connected with the low noise amplifier, the local oscillator frequency source and the intermediate frequency filter, the intermediate frequency filter is connected with the AGC amplifier or the logarithmic amplifier, one end of the analog-to-digital converter is connected with the amplifier, and the other end of the analog-to-digital converter is connected with the complex programmable logic device.
3. The digital normalization system for sound measurement power of the USB measurement and control transponder according to claim 2, wherein the digital frequency-locked phase-locked loop is composed of a frequency-locked loop digital control oscillator, two multipliers, two integral elimination units, a frequency discriminator, a frequency-locked loop filter, a phase discriminator, a phase-locked loop digital control vibrator, a phase-locked loop filter, a frequency word adder, a carrier tracking digital control oscillator and a sound measurement demodulation module which are connected with each other.
4. The system of claim 3, wherein the extraction unit uses two FIR filters with different center frequencies and same order to extract the primary and secondary distance measuring tones respectively.
5. The USB observe and control transponder sounding power digital normalization system of claim 1, wherein the digital down-conversion unit is further connected with a low-pass filter.
6. A digital normalization method for sound measurement power of a USB measurement and control transponder is characterized by comprising the following steps:
carrying out low-noise amplification, down-conversion, filtering, AGC (automatic gain control) amplification or logarithmic amplification on a received signal, and outputting the signal after analog-to-digital conversion;
receiving an output signal after analog-to-digital conversion to realize main carrier tracking;
carrying out digital down-conversion processing on the data subjected to analog-to-digital conversion and the main carrier tracking data, and outputting;
processing the output data of the digital down-conversion processing to extract a main ranging tone and a sub ranging tone, respectively completing the filtering of the main ranging tone and the sub ranging tone by using two FIR band-pass filters with different center frequencies and the same order number,
filtered primary ranging tone signal r1The mathematical expression of (n) is:
Figure FDA0003028547540000031
filtered sub ranging tone signal r2The mathematical expression of (n) is:
Figure FDA0003028547540000032
wherein:
Prfor received signal power, n is the data stream bit number;
mR1for the uplink main ranging tone system, wR1Is the frequency of the upstream main ranging tone,
Figure FDA0003028547540000033
is the initial phase of the ascending main ranging tone;
mR2for the uplink sub-ranging tone regime, wR2For the frequency of the uplink sub ranging tone,
Figure FDA0003028547540000034
is the initial phase of the ascending secondary distance measurement sound;
mTin order to remotely control the tone system,
Figure FDA0003028547540000041
is the initial phase of the remote control sound;
J0is a zero order Bessel function, J1Is a first order Bessel function;
performing real-time power estimation on the main ranging tone and the secondary ranging tone by using the integral elimination result of the main carrier frequency locking loop;
and carrying out power normalization processing on the primary distance measurement sound and the secondary distance measurement sound.
7. The USB measurement and control responder tone measurement power digital normalization method according to claim 6, characterized in that the signal r after digital down-conversion processingQ(n) using an algorithm:
Figure FDA0003028547540000042
wherein:
Prfor received signal power, n is the data stream bit number;
mR1for the uplink main ranging tone system, wR1Is the frequency of the upstream main ranging tone,
Figure FDA0003028547540000043
is the initial phase of the ascending main ranging tone;
mR2for the uplink sub-ranging tone regime, wR2For the frequency of the uplink sub ranging tone,
Figure FDA0003028547540000044
is the initial phase of the ascending secondary distance measurement sound;
mTfor remote control of tone system, dT(n) is remote control data, wTIn order to remotely control the audio frequency,
Figure FDA0003028547540000045
is the initial phase of the remote control sound;
J0is a zero order Bessel function, J1Is a first order bessel function.
8. The USB measurement and control transponder sound measurement power digital normalization method according to claim 6, wherein the main distance measurement sound signal r ist1(n) and a sub ranging tone signal rt2(n) the power normalization calculation adopts an algorithm:
Figure FDA0003028547540000051
Figure FDA0003028547540000052
wherein Power _ main is a Power estimation value;
mR1for the uplink main ranging tone system, mR2A tone system for uplink sub-ranging;
r1(n) is the primary ranging tone signal extracted from the input signal, r2(n) a secondary ranging tone signal extracted from the input signal;
J0is a zero order Bessel function, J1Is a first order bessel function.
9. The digital normalization method for sound measurement power of the USB measurement and control transponder according to claim 6, wherein two FIR filters with different center frequencies and the same order are used to extract the primary distance measurement sound and the secondary distance measurement sound respectively.
10. The digital normalization method for sound measurement power of the USB measurement and control transponder according to claim 6, wherein the power estimation is based on the in-phase branch signal r after the integral removal of the main carrierImain(n) and quadrature branch signal rQmainThe mathematical expression of (n) is:
Figure FDA0003028547540000053
Figure FDA0003028547540000054
calculating the Power _ main of the main carrier receiving signal, wherein the calculation formula is as follows:
Figure FDA0003028547540000061
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