CN113472364B - Multi-band self-adaptive telemetry signal demodulation method - Google Patents
Multi-band self-adaptive telemetry signal demodulation method Download PDFInfo
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Abstract
A method of multi-band adaptive telemetry signal demodulation, comprising: a direct up-conversion transmitting circuit is adopted to modulate a signal to be transmitted to an intermediate frequency, a baseband signal and a local oscillator signal are subjected to frequency mixing and transmitted by a transmitting antenna in a carrier wave form, a receiving circuit receives an echo signal through a receiving antenna, demodulates the echo signal and extracts signal coding information; different frequency modulation is carried out on different sent signals or echo signals, and the degree of relationship coefficient C between the kth frame image and the (k-1) th frame image is calculated from the second video frame imagekThe transmitting antenna and the receiving antenna are telescopic adjusting antennas. The method solves the problems that the transmission efficiency of the existing telemetering signal is low, more redundant information transmission occupies bandwidth resources greatly, and the flexibility and the equipment space utilization rate are very low because a plurality of antennas are set for carrying out distinctive frequency transmission according to the characteristic information of the transmission data in the prior art.
Description
Technical Field
The invention relates to the technical field of telemetering signal communication, in particular to a multi-band self-adaptive telemetering signal demodulation method.
Background
The input and output intermediate frequency bands designed by the traditional baseband equipment are mostly single carrier frequency, in the equipment, if the telemetering signals with higher code rate need to be received and demodulated, the bandwidth is larger, if the carrier frequency is single, the design is limited by hardware such as a filter, the manufacturing difficulty and the manufacturing cost are high, the problem that the single carrier frequency designed by the baseband equipment cannot bear the function of receiving and demodulating the telemetering signals with higher code rate can occur, and the intermediate frequency band of the single carrier frequency designed in the original baseband equipment becomes low carrier frequency under the requirement of telemetering the high code rate. For example, the carrier frequency of the baseband device is 70MHz, the bandwidth requirement is 140MHz, the bandwidth of the filter must cover the spectrum of 0-140MHz, and it is difficult to design and manufacture a wideband filter with such a low carrier frequency. At this time, the baseband device cannot adapt to the new telemetry signal requirement, and the application range of the device is limited.
The existing telemetry signal transmission efficiency is low, more redundant information transmission occupies bandwidth resources greatly, differential frequency transmission is not carried out according to transmission data characteristic information in the prior art, and a redundant information transmission mode is removed, the transmission efficiency needs to be improved, certain technical difficulties exist in signal receiving of different frequencies during signal receiving, a plurality of antennas are set at present, so that the flexibility and the equipment space utilization rate are very low, and the existing encoding and demodulation modes of transmission signals need to be strengthened urgently.
Disclosure of Invention
In order to solve the technical problem, the invention provides a multi-band adaptive telemetry signal demodulation method, which greatly improves the transmission demodulation efficiency of telemetry signals by carrying out different frequency modulation on different sent signals or echo signals and reducing the transmission of redundant information. The invention solves the problems that the transmission efficiency of the existing telemetering signal is lower, more redundant information transmission occupies bandwidth resources greatly, and the prior art does not set a plurality of antennas for distinctive frequency transmission according to the characteristic information of transmission data, so that the flexibility and the space utilization rate of equipment are very low, the method greatly enhances the controllability, the transmission timeliness and the data redundancy reduction, enhances the user experience, and is realized by the following scheme:
a method of multi-band adaptive telemetry signal demodulation, comprising: a direct up-conversion transmitting circuit is adopted to modulate a signal to be transmitted to an intermediate frequency, a baseband signal and a local oscillator signal are subjected to frequency mixing and transmitted by a transmitting antenna in a carrier wave form, a receiving circuit receives an echo signal through a receiving antenna, demodulates the echo signal and extracts signal coding information; the transmitted signals or echo signals comprise control parameter signals of a camera, a monitor and a computer, image video signals shot by the camera, monitoring parameter signals generated by the monitor and computer processing parameter signals, different frequency modulations are carried out on different transmitted signals or echo signals, and high-frequency sampling coding is adopted on the control parameter signals, the monitoring parameter signals and the computer processing parameter signals; preprocessing image video signals shot by a camera, and then sampling and coding the preprocessed image video signals by adopting a frequency different from a control parameter signal; the pretreatment process is as follows: acquiring telemetering video frame images in real time and calculating each imageThe level value, the image variance value and the image separation value of the first frame image, and a relation coefficient C of the k frame image and the k-1 frame image is calculated from the second video frame imagekIf the relation coefficient is smaller than the threshold value, the frame image and the previous frame image are unchanged and are not subjected to coding transmission, and the signal receiving end keeps consistent with the previous frame image; if the relation degree coefficient is larger than the threshold value C, encoding and transmitting position data of which the difference between the gray values of each pixel position (x, y) of the current image and the previous frame image is larger than Z;
the telemetering image proportion value is as follows:
m is the total number of pixels, n (L) is the number of pixels with a gray level of L, L is 1, 2, … L-1 is the gray level of the image;
level value of telemetry image:
telemetering an image variance value:
telemetry image separation value:
the transmitting antenna and the receiving antenna are telescopic adjusting antennas, the shape and the latitude of the radiation assembly can be automatically adjusted, and the signal frequency band can be adaptively received.
Preferably, the preprocessing further comprises denoising with an adaptive wiener filter.
Preferably, the coding transmission adopts convolutional coding and RS coding cascade, including RS coding, interleaving, convolutional coding of the input information, and finally sending to the transmission channel.
Preferably, the modulation to the intermediate frequency includes using two-stage digital attenuators in a cascade manner; a matched amplifier is used.
Preferably, the local oscillator signal first takes out a phase difference between the output signal and the input signal through the phase discriminator, converts the phase difference into an error voltage, and then filters out a high-frequency interference signal through the loop filter, so that a frequency difference between the output signal and the input signal of the phase-locked loop is zero.
Preferably, the retractable antenna receives a signal with the same frequency as the corresponding antenna state through automatically adjusting the shape and latitude of the radiation component, and then sends the signal to the down-conversion unit for processing, so as to realize multi-band synchronous acquisition of received data, and input the acquired signal to the information processing module.
Preferably, the modulating the signal to be transmitted to the intermediate frequency includes processing the signal to be transmitted in a form of a zero-order elliptic spherical wave signal PSWFs, selecting a bandwidth by using improved multi-symbol detection MSD and Turbo product code TPC, searching a path corresponding to a minimum manhattan distance through a phase trellis diagram, performing joint calculation on paths of received signals in a plurality of cycles to realize detection, outputting a symbol sequence corresponding to the path as a demodulation result, and encoding telemetry data having a specific frame format by TPC.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. by a degree of relation coefficient C to the telemetered imagekThe calculation and judgment of the method reduces the transmission of redundant information, greatly improves the transmission efficiency and reduces the use of bandwidth resources.
2. According to the invention, different frequency modulation is carried out on different sent signals or echo signals, distortion of data signals with higher accuracy requirements is reduced as much as possible, more unchanged pixels are designed for video image information, and transmission of sampling signals is carried out through proper frequency, so that the bandwidth utilization rate is greatly improved; high-frequency sampling coding is adopted for control parameter signals, monitoring parameter signals and computer processing process parameter signals; the image video signal shot by the camera adopts more appropriate frequency coding, so that the transmission efficiency is greatly improved, and the user experience is enhanced.
3. The telescopic adjusting antenna is used for setting multi-band self-adaptive demodulation, the signal frequency band is received in a self-adaptive mode through the shape and the latitude of the radiation assembly which can be automatically adjusted, the system structure has high logic flexibility and high ductility, and a plurality of frequency signals can be identified and received through the automatic adjusting antenna.
4. The invention combines the zero order elliptic spherical wave signal PSWFs with the improved multi-symbol detection MSD and the Turbo product code TPC to demodulate and modulate the signal, can fully utilize the excellent basic characteristics of the optimal time frequency energy aggregation and flexible and controllable time bandwidth product of the zero order elliptic spherical wave signal, reasonably selects the medium frequency bandwidth parameter of the telemetering system, and greatly improves the accuracy of the multi-symbol detection MSD by sampling the Manhattan distance.
Drawings
FIG. 1 is an overall flow diagram of the method of the present invention;
Detailed Description
As will be appreciated by those skilled in the art, as the background art shows, the conventional telemetry signal transmission efficiency is low, the transmission of more redundant information greatly occupies bandwidth resources, the prior art does not perform distinctive frequency transmission according to the characteristic information of the transmission data, and removes the redundant transmission information, the transmission efficiency needs to be improved, and there is a certain technical difficulty in receiving signals with different frequencies during signal reception. Therefore, the embodiment of the invention provides a multi-band adaptive telemetry signal demodulation method, which greatly improves the transmission demodulation efficiency of telemetry signals by carrying out different frequency modulation on different sent signals or echo signals and reducing the transmission of redundant information. The method solves the problems that the transmission efficiency of the existing telemetering signal is low, more redundant information transmission occupies bandwidth resources greatly, and the flexibility and the equipment space utilization rate are very low because a plurality of antennas are set for carrying out distinctive frequency transmission according to the characteristic information of the transmission data in the prior art. In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without inventive work are within the scope of the present invention.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a multiband adaptive telemetry signal demodulation method, including: a direct up-conversion transmitting circuit is adopted to modulate a signal to be transmitted to an intermediate frequency, a baseband signal and a local oscillator signal are subjected to frequency mixing and transmitted by a transmitting antenna in a carrier wave form, a receiving circuit receives an echo signal through a receiving antenna, demodulates the echo signal and extracts signal coding information; the transmitted signals or echo signals comprise control parameter signals of a camera, a monitor and a computer, image video signals shot by the camera, monitoring parameter signals generated by the monitor and computer processing parameter signals, different frequency modulations are carried out on different transmitted signals or echo signals, and high-frequency sampling coding is adopted on the control parameter signals, the monitoring parameter signals and the computer processing parameter signals; preprocessing image video signals shot by a camera, and then sampling and coding the preprocessed image video signals by adopting a frequency different from a control parameter signal; the pretreatment process is as follows: real timeObtaining telemetering video frame images, calculating a horizontal value, an image variance value and an image separation value of each image, and calculating a relation degree coefficient C of a k frame image and a k-1 frame image from a second video frame imagekIf the relation coefficient is smaller than the threshold value, the frame image and the previous frame image are unchanged and are not subjected to coding transmission, and the signal receiving end keeps consistent with the previous frame image; if the relation degree coefficient is larger than the threshold value C, encoding and transmitting position data of which the difference between the gray values of each pixel position (x, y) of the current image and the previous frame image is larger than Z;
the telemetering image proportion value is as follows:
m is the total number of pixels, n (L) is the number of pixels with a gray level of L, L is 1, 2, … L-1 is the gray level of the image;
level value of telemetry image:
telemetering an image variance value:
telemetry image separation value:
the transmitting antenna and the receiving antenna are telescopic adjusting antennas, the shape and the latitude of the radiation assembly can be automatically adjusted, and the signal frequency band can be adaptively received.
In some embodiments, the preprocessing further comprises denoising with an adaptive wiener filter.
In some embodiments, the encoded transmission uses a concatenation of convolutional coding and RS coding, including RS coding, interleaving, convolutional coding of the input information, and finally sending to the transmission channel.
In some embodiments, said modulating to an intermediate frequency comprises using two stages of digital attenuators in a cascaded manner; a matched amplifier is used.
Example 2
In some embodiments: a secondary frequency conversion transmitting circuit is adopted to modulate a signal to be transmitted to an intermediate frequency, a baseband signal and a local oscillator signal are subjected to frequency mixing and transmitted by a transmitting antenna in a carrier wave form, a receiving circuit receives an echo signal through a receiving antenna, demodulates the echo signal and extracts signal coding information; the transmitted signals or echo signals comprise control parameter signals of a camera, a monitor and a computer, image video signals shot by the camera, monitoring parameter signals generated by the monitor and computer processing parameter signals, different frequency modulations are carried out on different transmitted signals or echo signals, and high-frequency sampling coding is adopted on the control parameter signals, the monitoring parameter signals and the computer processing parameter signals; preprocessing image video signals shot by a camera, and then sampling and coding the preprocessed image video signals by adopting a frequency different from a control parameter signal; the pretreatment process is as follows: acquiring telemetering video frame images in real time, calculating a horizontal value, an image variance value and an image separation value of each image, and calculating a relation coefficient C of a k frame image and a k-1 frame image from a second video frame imagekIf the relation coefficient is smaller than the threshold value, the frame image and the previous frame image are unchanged and are not subjected to coding transmission, and the signal receiving end keeps consistent with the previous frame image; if the relation degree coefficient is larger than the threshold value C, encoding and transmitting position data of which the difference between the gray values of each pixel position (x, y) of the current image and the previous frame image is larger than Z; rest position protectionConsistent with the original data.
The telemetering image proportion value is as follows:
m is the total number of pixels, n (L) is the number of pixels with a gray level of L, L is 1, 2, … L-1 is the gray level of the image;
level value of telemetry image:
telemetering an image variance value:
telemetry image separation value:
the transmitting antenna and the receiving antenna are telescopic adjusting antennas, the shape and the latitude of the radiation assembly can be automatically adjusted, and the signal frequency band can be adaptively received.
In some embodiments, the local oscillator signal first extracts a phase difference between the output signal and the input signal through a phase detector, converts the phase difference into an error voltage, and then filters out a high-frequency interference signal through a loop filter, so that a frequency difference between the output signal and the input signal of the phase-locked loop is zero.
In some embodiments, the retractable antenna receives a signal with the same frequency as a corresponding antenna state through automatically adjusting the shape and the latitude of the radiation component, and then sends the signal to the down-conversion unit for processing, so as to realize multi-band synchronous acquisition of received data, and input the acquired signal to the information processing module.
In some embodiments, the modulating the signal to be transmitted to the intermediate frequency includes processing the signal to be transmitted in a form of a zero-order ellipsoidal wave signal PSWFs, performing bandwidth selection using improved multi-symbol detection MSD and Turbo product code TPC, searching a path corresponding to a minimum manhattan distance through a phase trellis diagram, performing detection by performing joint calculation on paths of received signals in a plurality of cycles, outputting a symbol sequence corresponding to the path as a demodulation result, and encoding telemetry data having a specific frame format by TPC.
The invention relates to a multi-band self-adaptive telemetering signal demodulation method, which is implemented by a relation coefficient C of a telemetering imagekThe calculation and judgment of the method reduces the transmission of redundant information, greatly improves the transmission efficiency and reduces the use of bandwidth resources. According to the invention, different frequency modulation is carried out on different sent signals or echo signals, distortion of data signals with higher accuracy requirements is reduced as much as possible, more unchanged pixels are designed for video image information, and transmission of sampling signals is carried out through proper frequency, so that the bandwidth utilization rate is greatly improved; high-frequency sampling coding is adopted for control parameter signals, monitoring parameter signals and computer processing process parameter signals; the image video signal shot by the camera adopts more appropriate frequency coding, so that the transmission efficiency is greatly improved, and the user experience is enhanced. The invention combines the zero order elliptic spherical wave signal PSWFs with the improved multi-symbol detection MSD and the Turbo product code TPC to demodulate and modulate the signal, can fully utilize the excellent basic characteristics of the optimal time frequency energy aggregation and flexible and controllable time bandwidth product of the zero order elliptic spherical wave signal, reasonably selects the medium frequency bandwidth parameter of the telemetering system, and greatly improves the accuracy of the multi-symbol detection MSD by sampling the Manhattan distance. The arrangement of the telescopic adjusting antenna can be used for self-adaptively receiving signals by automatically adjusting the shape and the latitude of the radiation componentThe frequency band, system structure logic flexibility is stronger, has great ductility, and the discernment of accessible automatically regulated antenna mode realization a plurality of frequency signals is received.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A method for multi-band adaptive telemetry signal demodulation, comprising: the method comprises the steps that a direct up-conversion transmitting circuit is adopted to modulate signals to be transmitted to intermediate frequency, baseband signals and local oscillation signals are subjected to frequency mixing and transmitted by a transmitting antenna in a carrier mode, and a receiving circuit receives echo signals through a receiving antenna, demodulates the echo signals and extracts signal coding information; the transmitted signals or echo signals comprise control parameter signals of a camera, a monitor and a computer, image video signals shot by the camera, monitoring parameter signals generated by the monitor and computer processing parameter signals, different frequency modulations are carried out on different transmitted signals or echo signals, and high-frequency sampling coding is adopted on the control parameter signals, the monitoring parameter signals and the computer processing parameter signals; preprocessing image video signals shot by a camera, and then sampling and coding the preprocessed image video signals by adopting a frequency different from a control parameter signal; the pretreatment process is as follows: acquiring telemetering video frame images in real time, calculating a horizontal value, an image variance value and an image separation value of each image, and calculating a relation coefficient C of a k frame image and a k-1 frame image from a second video frame imagekIf the relation coefficient is smaller than the threshold value, the frame image and the previous frame image are unchanged and are not subjected to coding transmission, and the signal receiving end keeps consistent with the previous frame image; if the relation degree coefficient is larger than the threshold value C, encoding and transmitting position data of which the difference between the gray values of each pixel position (x, y) of the current image and the previous frame image is larger than Z;
the telemetering image proportion value is as follows:
m is the total number of pixels, n (L) is the number of pixels with a gray level of L, L is 1, 2, … L-1 is the gray level of the image;
level value of telemetry image:
telemetering an image variance value:
telemetry image separation value:
the transmitting antenna and the receiving antenna are telescopic adjusting antennas, the shape and the latitude of the radiation assembly can be automatically adjusted, and the signal frequency band can be adaptively received.
2. The method of claim 1, wherein said preprocessing further comprises denoising with an adaptive wiener filter.
3. The method of claim 1, wherein the encoded transmission is concatenated with a convolutional code, including RS coding, interleaving, convolutional coding of the input information, and finally sending to the transmission channel.
4. The method of claim 1, wherein said modulating to an intermediate frequency comprises using two digital attenuators in a cascaded manner; a matched amplifier is used.
5. The method of claim 1, wherein the local oscillator signal is first processed by a phase detector to extract a phase difference between the output signal and the input signal, and the phase difference is converted into an error voltage, and then a loop filter is used to filter out high frequency interference signals, so that the frequency difference between the output signal and the input signal of the phase locked loop is zero.
6. The method as claimed in claim 1, wherein the scalable tunable antenna receives the signal with the same frequency as the corresponding antenna by automatically tuning the shape and latitude of the radiating element, and sends the signal to the down-conversion unit for processing, thereby achieving multi-band synchronous acquisition of the received data, and inputting the acquired signal to the information processing module.
7. The method of claim 1, wherein the modulating the signal to be transmitted to an intermediate frequency comprises processing the signal to be transmitted in the form of a zero-order elliptic spherical wave signal PSWFs, performing bandwidth selection by using improved multi-symbol detection MSD and Turbo product code TPC, searching a path corresponding to a minimum manhattan distance through a phase trellis diagram, performing joint calculation on paths of the received signal in a plurality of cycles to perform detection, outputting a symbol sequence corresponding to the path as a demodulation result, and encoding telemetry data having a specific frame format by using TPC.
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