CN117675056A

CN117675056A - Short-time burst signal ultra-wideband capturing receiver

Info

Publication number: CN117675056A
Application number: CN202211008192.1A
Authority: CN
Inventors: 杨丰茂; 王森; 王斌
Original assignee: Beijing Zhenxing Metrology and Test Institute
Current assignee: Beijing Zhenxing Metrology and Test Institute
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2024-03-08

Abstract

The invention relates to an ultra-wideband capture receiver for short-time burst signals, belongs to the technical field of short-time burst signal capture, and solves the problem that short-time burst signals are easy to miss in the existing capture mode. The receiver includes: the antenna group module is used for capturing N radio frequency signals with different frequency bands, and the frequencies of the N radio frequency signals with different frequency bands are sequentially increased and are continuous; dividing the N different frequency bands into a low frequency band, a medium frequency band and a high frequency band; n signal processing channels, each signal processing channel processes radio frequency signals of a frequency band; the signal processing channel corresponding to the low frequency band comprises a data processing module; the signal processing channel corresponding to the medium frequency band comprises a frequency tracking module and a data processing module which are sequentially connected; the signal processing channel corresponding to the high frequency band comprises a superheterodyne frequency-reducing module, a frequency tracking module and a data processing module which are connected in sequence.

Description

Short-time burst signal ultra-wideband capturing receiver

Technical Field

The invention relates to the technical field of short-time burst signal capturing, in particular to an ultra-wideband capturing receiver for short-time burst signals.

Background

The short-time burst signal is a burst communication signal, and is mainly characterized by random occurrence time, short signal pulse width and usually less than 1s, so that the burst communication signal has strong anti-reconnaissance capability and is commonly used in the field of hidden communication, such as submarine external communication and the like. Based on the above-described characteristics of the burst signal, it is extremely difficult for non-partners to capture the burst signal without any a priori information. The short-time burst signal is captured under the non-cooperative condition, and the frequency band of the burst signal is unknown, so that detection in an ultra-wideband range is needed to avoid missed detection.

At present, the conventional mainstream ultra-wideband spectrum measurement technology is mainly developed based on a sweep-frequency structure of local oscillation scanning and intermediate frequency filtering, but the sweep-frequency structure has an unavoidable problem that local oscillation signals are periodically scanned according to certain steps, and signals outside the sweep-frequency band cannot be detected. The detection mode is suitable for steady-state signals, and is not suitable for detecting unsteady-state signals such as short-time burst signals, frequency hopping signals and the like.

In addition, researchers also put forward a technical scheme of 'through real-time spectrum analysis to the full-band signal', so as to overcome the signal missing detection problem caused by the sweep frequency mode. But this approach has the following problems: due to the sampling capability of the ADC and the processing capability of the FPGA, the scheme can only capture burst signals of a specific frequency band, and can not capture burst signals under the ultra-wideband (1 GHz-50 GHz) condition, so that detection of out-of-band signals can be missed under the condition that the frequency band of non-cooperative short-time burst signals is unknown.

Disclosure of Invention

In view of the above analysis, the embodiment of the invention aims to provide an ultra-wideband capturing receiver for short-time burst signals, which is used for solving the problem that the short-time burst signals are easy to miss in the existing capturing mode.

The invention discloses a short-time burst signal ultra-wideband capture receiver, which comprises:

the antenna group module is used for capturing N radio frequency signals with different frequency bands, and the frequencies of the N radio frequency signals with different frequency bands are sequentially increased and are continuous; dividing the N different frequency bands into a low frequency band, a medium frequency band and a high frequency band;

n signal processing channels, each signal processing channel processes radio frequency signals of a frequency band; the signal processing channel corresponding to the low frequency band comprises a data processing module; the signal processing channel corresponding to the medium frequency band comprises a frequency tracking module and a data processing module which are sequentially connected; the signal processing channel corresponding to the high frequency band comprises a superheterodyne frequency-reducing module, a frequency tracking module and a data processing module which are connected in sequence; the superheterodyne frequency reduction module is used for moving the radio frequency signals of the high frequency band captured by the antenna to the intermediate frequency band; the frequency tracking module is used for moving the radio frequency signals moved to the intermediate frequency band or the radio frequency signals of the intermediate frequency band captured by the antenna to the data processing frequency band; the data processing module is used for judging the radio frequency signals moved to the data processing frequency band or the radio frequency signals of the low frequency band captured by the antenna and capturing short-time burst signals.

Based on the scheme, the invention also makes the following improvements:

further, the antenna group module comprises N antenna group sub-modules with different frequency bands, and the antenna group sub-module of each frequency band comprises an antenna, a low noise amplifier and a primary filter which are connected in sequence; wherein,

the input end of the low-noise amplifier is used for receiving the original signal of the current frequency band captured by the antenna, the output end of the low-noise amplifier is connected with the input end of the primary filter, and the output end of the primary filter outputs the radio frequency signal of the current frequency band captured by the antenna.

Further, the superheterodyne down-conversion module comprises a secondary mixer, a secondary filter and a local vibration source; wherein,

the first input end of the secondary mixer is used for receiving radio frequency signals of corresponding frequency bands; the second input end of the secondary mixer is connected with the local vibration source of the corresponding frequency band, the output end of the secondary mixer is connected with the input end of the secondary filter, and the output end of the secondary filter is used for outputting radio frequency signals moved to the intermediate frequency band.

Further, the frequency tracking module comprises a power divider, an instantaneous frequency detector, a digital tracking frequency source, a three-stage mixer and a three-stage filter; wherein,

the input end of the power divider is used for receiving the radio frequency signal moved to the intermediate frequency band or the radio frequency signal of the intermediate frequency band captured by the antenna;

the first output end of the power divider is connected with the first input end of the three-stage mixer, the second output end of the power divider is connected with the input end of the instantaneous frequency detector, the output end of the instantaneous frequency detector is connected with the input end of the digital tracking frequency source, and the output end of the digital tracking frequency source is connected with the second input end of the three-stage mixer;

the output end of the three-stage mixer is connected with the input end of the three-stage filter, and the output end of the three-stage filter is used for outputting radio frequency signals moved to a data processing frequency band.

Further, the data processing module comprises an AD conversion component, a channelizing and spectrum analysis component and a frequency template triggering component which are connected in sequence; wherein,

the AD conversion component is used for carrying out analog-to-digital conversion on the radio frequency signals moved to the data processing frequency band or the radio frequency signals of the low frequency band captured by the antenna;

the channelizing and spectrum analysis component is used for dividing the digital signal after analog-to-digital conversion into a plurality of narrow bands and carrying out spectrum analysis on the signals of each narrow band to obtain a corresponding spectrum analysis result;

and the frequency template triggering component is used for triggering the frequency template of the spectrum analysis result and judging whether a short-time burst signal exists or not.

Further, the sampling frequency of the AD conversion component is adapted to the range of the frequency band interval of the data processing frequency band.

Further, the band-pass filtering frequency band parameter of the primary filter is the same as the frequency band interval range of the frequency band where the captured radio frequency signal is located;

the band-pass filtering frequency band parameters of the secondary filter are the same as the frequency band interval range shifted to the intermediate frequency band;

the band-pass filtering frequency band parameters of the three-stage filter are the same as the frequency band range moved to the data processing frequency band.

Further, the receiver also comprises a data storage module, which is used for storing the spectrum analysis result corresponding to the short-time burst signal when the short-time burst signal is judged.

Further, the low frequency band comprises a frequency band, and the frequency range of the frequency band is 1 GHz-2 GHz;

the intermediate frequency band comprises a frequency band, and the range of the frequency band is 2 GHz-18 GHz;

the high frequency band comprises two frequency bands, and the frequency ranges of the two frequency bands are 18 GHz-34 GHz and 34 GHz-50 GHz respectively.

Further, the frequency band parameter of the data processing frequency band is 0.3 GHz-2.3 GHz.

Compared with the prior art, the invention has at least one of the following beneficial effects:

1) The short-time burst signal ultra-wideband capturing receiver provided by the invention has the advantages that a plurality of frequency bands are divided, the higher frequency band is moved to the lower frequency band for processing by the superheterodyne technology, useless signals in the wider frequency band to be detected are also removed by the instantaneous frequency measurement technology, the processing capacity is concentrated in a narrower range, and the problem of capturing non-cooperative short-time burst signals in the frequency band range of 1 GHz-50 GHz is effectively solved;

2) The short-time burst signal ultra-wideband capture receiver provided by the invention effectively solves the problem of missing detection of short-time burst signals in a sweep frequency mode of local oscillator scanning and intermediate frequency filtering, and improves the detection precision of the short-time burst signals.

3) The receiver can realize ultra-wideband capturing of short-time burst signals under the non-cooperative condition, and has important significance in aspects of anti-diving operations and the like.

In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.

Fig. 1 is a schematic structural diagram of an ultra wideband capturing receiver for short-time burst signals according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a short-time burst ultra-wideband capturing receiver when divided into four frequency bands according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an antenna group module 1 according to an embodiment of the present invention.

Reference numerals:

1-antenna group module; a 2-superheterodyne down-conversion module; 3-a frequency tracking module; 4-a data processing module; 5-a data storage module.

Detailed Description

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.

The embodiment of the invention provides a short-time burst signal ultra-wideband capturing receiver, the structure of which is shown in figure 1, comprising:

the antenna group module 1 is used for capturing N radio frequency signals with different frequency bands, and the frequencies of the N radio frequency signals with different frequency bands are sequentially increased and are continuous; dividing the N different frequency bands into a low frequency band, a medium frequency band and a high frequency band;

n signal processing channels, each signal processing channel processes radio frequency signals of a frequency band; the signal processing channel corresponding to the low frequency band comprises a data processing module 4; the signal processing channel corresponding to the middle frequency band comprises a frequency tracking module 3 and a data processing module 4 which are connected in sequence; the signal processing channel corresponding to the high frequency band comprises a superheterodyne frequency-reducing module 2, a frequency tracking module 3 and a data processing module 4 which are connected in sequence; in the example of fig. 1, the low frequency band, the medium frequency band, and the high frequency band each include one frequency band. The superheterodyne down-conversion module 2 is configured to shift a radio frequency signal in a high frequency band captured by the antenna to a medium frequency band; the frequency tracking module 3 is used for moving the radio frequency signal moved to the intermediate frequency band or the radio frequency signal of the intermediate frequency band captured by the antenna to the data processing frequency band; and the data processing module 4 is used for judging the radio frequency signals moved to the data processing frequency band or the radio frequency signals of the low frequency band captured by the antenna and capturing short-time burst signals.

Next, the following details are given to each module involved in the scheme of this embodiment:

(1) Antenna group module 1

The purpose is as follows: ultra wideband radio frequency signals, which may contain short time bursts, are received in space.

The antenna group module 1 comprises N antenna group sub-modules with different frequency bands, and the antenna group sub-module of each frequency band comprises an antenna, a low noise amplifier and a primary filter which are connected in sequence; the input end of the low-noise amplifier is used for receiving an original signal of the current frequency band captured by the antenna, the output end of the low-noise amplifier is connected with the input end of the primary filter, and the output end of the primary filter outputs a radio frequency signal of the current frequency band captured by the antenna. In this embodiment, the primary filter is a bandpass filter, and the bandpass filter frequency band parameter of the primary filter is the same as the frequency band interval range of the frequency band where the captured radio frequency signal is located. Specifically, the band-pass filter frequency band parameter of the primary filter is a band-pass filter interval formed by the upper frequency limit and the lower frequency limit of band-pass filter.

Illustratively, in the present embodiment, in consideration of the fact that the short-time burst signal may occur in a wide frequency band, the ultra-wideband range designed in the present embodiment is a frequency band of 1GHz to 50GHz in order to effectively capture the short-time burst signal. Preferably, in the present embodiment, the frequency ranges of the first to fourth frequency bands are divided in the following manner: the frequency range of the first frequency band is 1 GHz-2 GHz, the frequency range of the second frequency band is 2 GHz-18 GHz, the frequency range of the third frequency band is 18 GHz-34 GHz, and the frequency range of the fourth frequency band is 34 GHz-50 GHz. The first frequency band is a low frequency band, the second frequency band is a medium frequency band, and the third and fourth frequency bands are high frequency bands. At this time, a schematic diagram of the structure of the short-time burst ultra-wideband acquisition receiver is shown in fig. 2. It should be emphasized that the preferred frequency band division manner in this embodiment has the following advantages:

1) The frequency of the frequency band of 1 GHz-2 GHz is relatively low, harmonic interference is easy to cause, and therefore the frequency band is independently extracted to be used as one path;

2) In the remaining 3 frequency bands, each frequency band is about 16GHz, and the devices involved in the scheme are practically verified and can be realized;

3) The design of the rear three paths is basically the same, and the components of the power divider and the rear are completely the same in actual production, so that the same hardware is used for producing three sets, and the production difficulty is effectively reduced.

At this time, the schematic structure of the antenna group module 1 is shown in fig. 3, and in the implementation process, the antenna group module 1 receives radio frequency signals in the frequency range of 1GHz to 50GHz in the space, and outputs four paths of analog signals of 1GHz to 2GHz, 2GHz to 18GHz, 18GHz to 34GHz and 34GHz to 50GHz after passing through four antennas with different frequency bands, low noise amplifiers and a primary filter in the antenna group module 1.

In order to detect whether a short-time trigger burst signal exists in each frequency band, a signal processing channel matched with each frequency band is arranged in the receiver, and each signal processing channel processes a radio frequency signal of one frequency band. As shown in fig. 1, the signal processing channel of the first frequency band (in the low frequency band) includes only the data processing module 4; the signal processing channel of the second frequency band (in the middle frequency band) comprises a frequency tracking module 3 and a data processing module 4 which are connected in sequence; the signal processing channels of the third frequency band and the fourth frequency band (in the high frequency band) comprise a superheterodyne frequency-reducing module 2, a frequency tracking module 3 and a data processing module 4 which are connected in sequence.

(2) Superheterodyne down conversion module 2

The purpose is as follows: the received signals in the two high frequency bands of 18 GHz-34 GHz and 34 GHz-50 GHz are not beneficial to the later digital acquisition and analysis processing due to the higher frequency, so that the signals in the two frequency bands need to be moved to the low frequency band.

The superheterodyne frequency-reducing module comprises a secondary mixer, a secondary filter and a local vibration source; the first input end of the two-stage mixer is used for receiving radio frequency signals of corresponding frequency bands; the second input end of the secondary mixer is connected with the local vibration source of the corresponding frequency band, the output end of the secondary mixer is connected with the input end of the secondary filter, and the output end of the secondary filter is used for outputting radio frequency signals moved to the intermediate frequency band.

In this embodiment, the local oscillation source of each frequency band needs to be adapted to the frequency band in which the received radio frequency signal is located. Taking four frequency bands divided in the embodiment as an example, the local oscillation frequency of the local oscillation source of the third frequency band is 16GHz, and the local oscillation frequency of the local oscillation source of the fourth frequency band is 32GHz; the two-stage filter also selects a band-pass filter, and the band-pass filter frequency range parameters are the same as the frequency range shifted to the intermediate frequency range. In the specific implementation process, the superheterodyne receiving principle is adopted, signals in two frequency bands of 18 GHz-34 GHz and 34 GHz-50 GHz are mixed with local oscillation sources with local oscillation frequencies of 16GHz and 32GHz respectively, and two paths of signals in the frequency bands of 2 GHz-18 GHz are selected through a secondary filter in the corresponding frequency band.

(3) Frequency tracking module 3

The purpose is as follows: and (3) the obtained frequency band signals of 2 GHz-18 GHz possibly have short-time burst signals, and the module shifts the frequency band possibly having the short-time burst signals to a data processing frequency band.

The frequency tracking module 3 comprises a power divider, an instantaneous frequency detector, a digital tracking frequency source, a three-stage mixer and a three-stage filter; the input end of the power divider is used for receiving the radio frequency signal moved to the intermediate frequency band or the radio frequency signal of the intermediate frequency band captured by the antenna; the first output end of the power divider is connected with the first input end of the three-stage mixer, the second output end of the power divider is connected with the input end of the instantaneous frequency detector, the output end of the instantaneous frequency detector is connected with the input end of the digital tracking frequency source, and the output end of the digital tracking frequency source is connected with the second input end of the three-stage mixer; the output end of the three-stage mixer is connected with the input end of the three-stage filter, and the output end of the three-stage filter is used for outputting radio frequency signals moved to a data processing frequency band. The three-stage filter also selects a band-pass filter, and the band-pass filter frequency range parameters are the same as the frequency range moved to the data processing frequency range.

Illustratively, the frequency band interval of the data processing frequency band ranges from 0.3GHz to 2.3GHz, and the reason for moving to the data processing frequency band is as follows: the maximum sampling frequency of the current mature ADC chip is 5Gsps, and the chips with larger sampling rate are also, but the current application is not particularly mature and stable, so according to the Nyquist sampling theorem, 2.5GHz signals can be maximally adopted, and the signal noise of a too low frequency band is relatively large, so that a bit of redundancy design is made in the low frequency band and the place close to 2.5GHz in the design, and the frequency band is selected to be 0.3 GHz-2.3 GHz. Thus, if ADC chips with other sampling rates are used, the parameter can be changed from 0.3GHz to 2.3GHz.

In the implementation process, firstly, an input 2 GHz-18 GHz frequency band signal is divided into A, B paths by a power divider; the A path of signal is subjected to frequency measurement through an instantaneous frequency measuring device, so that frequency information with stronger signal amplitude is obtained; transmitting the information to a digital tracking frequency source, and generating a local oscillation signal of the frequency by the frequency source; the generated local oscillation signal and the B path signal are mixed and filtered, so that the frequency band of the burst signal possibly existing in the original signal is shifted to the frequency band of 0.3 GHz-2.3 GHz.

(4) Data processing module 4

The data processing module comprises an AD conversion component, a channelizing and spectrum analysis component and a frequency template triggering component which are connected in sequence; wherein,

the AD conversion component is used for carrying out analog-to-digital conversion on the radio frequency signals moved to the data processing frequency band or the radio frequency signals of the low frequency band captured by the antenna; in order to adapt to the analog-to-digital conversion process of the signal, the sampling frequency of the AD conversion component is adapted to the range of the frequency band interval of the data processing frequency band;

Illustratively, the AD conversion component may be implemented by an ADC chip, the function of the channelisation and spectrum analysis component may be implemented based on an FPGA chip, and the function of the frequency template triggering component may be implemented based on a DSP chip. In the specific implementation process, the method comprises the following steps of,

the AD conversion component (the sampling rate index is not less than 5 GSPS) is utilized to respectively collect the received analog signals, and the obtained digital signals are sent to the channelizing and spectrum analysis component (FPGA chip);

the channelizing and spectrum analysis component firstly carries out channelizing processing to divide the signal with the bandwidth of 2GHz into 2 on average ⁿ And carrying out spectrum analysis on each narrow band to finally obtain a corresponding spectrum analysis result. The selection mode of n has no special requirement, is mainly defined according to FGPA performance and the frequency band width which a user wants to divide, and the performance of the FPGA is basically enough at present, so that the user can design according to the actual requirement of the user without specific constraint. The spectrum analysis is mainly to perform FFT calculation, restore is not needed after the spectrum is obtained, and frequency template triggering is directly performed to judge whether short-time burst signals exist.

And in the frequency template triggering component, judging whether a short-time burst signal exists or not by utilizing a frequency template triggering technology. Illustratively, from the occurrence of the signal to the end of the signal, the frequency template triggering is performed on the spectrum analysis result of each frame, and the following judgment is performed:

from the occurrence of the signal to the end of the signal, respectively carrying out frequency template triggering judgment on the spectrum analysis result of each frame, judging whether a short-time burst signal exists or not, and if not, directly stopping the subsequent processing and storage of the signal; if so, the start and end of the burst signal are determined by combining the determination result Y of the present frame and the determination result X of the previous frame, and the determination table is as follows:

calculating the duration time of the continuous frame number with the judgment result of 1, and if the duration time is smaller than the preset duration time, a short-time burst signal exists; otherwise, there is no short burst signal.

Illustratively, based on the characteristic that the short-time burst signal has a short duration, generally not more than 1s, it is necessary to perform duration calculation on the number of frames for which the continuous determination result is 1, and when the duration is more than 1s (this value may be modified according to the actual application scenario), it is determined as a non-short-time burst signal.

The receiver may further comprise a data storage module 5 (e.g. "high performance memory") for storing a spectral analysis result corresponding to the short-time burst signal when the short-time burst signal is discriminated.

Therefore, in the four groups of data processing sub-modules in the data processing module 4, the input signals can be 1 GHz-2 GHz analog signals or 0.3 GHz-2.3 GHz analog signals, after digital acquisition, digital channelizing and spectrum analysis are performed in the FPGA, then frequency template trigger detection and frame length discrimination are performed, so that whether short-time burst signals exist or not is judged, and the time length detection is realized, and finally the captured short-time burst signals are stored in a high-performance memory.

In order to facilitate the better understanding of the scheme of the present embodiment in the field, taking the above frequency band division manner as an example, the working flow of the short-time burst signal ultra-wideband capturing receiver provided by the present embodiment is now carded as follows:

1) The antenna group formed by the four antennas receives signals in the frequency range of 1 GHz-50 GHz, and processes four paths of signals according to the steps 2-5;

2) The signal quality of signals of 1 GHz-2 GHz is improved through a low noise amplifier and a filter, and a first path of analog signals are formed;

3) The signal quality of the signals of 2 GHz-18 GHz is improved through a low noise amplifier and a filter, and a second path of analog signals which possibly contain burst signals and have the bandwidth of 2GHz is formed through a frequency tracking module;

4) The signal quality of the signals of 18 GHz-34 GHz is improved through a low noise amplifier and a filter, the frequency of the signals is reduced to the frequency range of 2 GHz-18 GHz through a superheterodyne frequency-reducing module with the local oscillation frequency of 16GHz, and a third path of analog signals which possibly contain burst signals and have the bandwidth of 2GHz is formed through a frequency tracking module;

5) The signal quality of the signals of 34 GHz-50 GHz is improved through a low noise amplifier and a filter, the frequency of the signals is reduced to the frequency range of 2 GHz-18 GHz through a superheterodyne frequency-reducing module with the local oscillation frequency of 32GHz, and a fourth path of analog signals which possibly contain burst signals and have the bandwidth of 2GHz is formed through a frequency tracking module;

6) Respectively carrying out digital acquisition on the four paths of signals by using an ADC sampling chip, carrying out digital channelizing and spectrum analysis by using an FPGA, and carrying out processing such as frequency template triggering and frame length discrimination by using a DSP chip to realize the identification and capture of short-time burst signals;

7) Data frames containing short bursts of signals are stored on a high performance memory.

Finally, it should be noted that the dividing manner of the N different frequency bands may be selected according to the need, and is not limited to the above manner given in the present embodiment. Still taking the division of four frequency bands as an example, the frequency ranges of the first to fourth frequency bands are divided as follows: the frequency range of the first frequency band is 1 GHz-1.4 GHz, the frequency range of the second frequency band is 1.4 GHz-17.6 GHz, the frequency range of the third frequency band is 17.6 GHz-33.8 GHz, and the frequency range of the fourth frequency band is 33.8 GHz-50 GHz. The first frequency band is a low frequency band, the second frequency band is a medium frequency band, and the third and fourth frequency bands are high frequency bands. After being processed by the superheterodyne frequency-reducing module 2, signals in the third frequency band and the fourth frequency band are moved to 1.4 GHz-17.6 GHz, in the process, the local oscillation frequency of the local oscillation source in the third frequency band can be 16.2GHz, and the local oscillation frequency of the local oscillation source in the fourth frequency band can be 32.2GHz. After being processed by the frequency tracking module 3, the range of the moved data processing frequency band can be designed to be 0.2 GHz-2.23 GHz, and at the moment, the sampling frequency requirement of the AD conversion assembly can be still met. By way of example, it is also possible to take the division of three frequency bands as an example, the frequency ranges of the first to third frequency bands being divided in the following manner: the frequency range of the first frequency band is 1 GHz-2 GHz, the frequency range of the second frequency band is 2 GHz-26 GHz, and the frequency range of the third frequency band is 26 GHz-50 GHz. The first frequency band is a low frequency band, the second frequency band is a medium frequency band, and the third frequency band is a high frequency band. After being processed by the superheterodyne frequency-reducing module 2, the signal in the third frequency band is moved to 2 GHz-26 GHz, and in the process, the local oscillation frequency of the local oscillation source in the third frequency band can be 24GHz. After being processed by the frequency tracking module 3, the range of the moved data processing frequency band can still be designed to be 0.3 GHz-2.3 GHz. Therefore, the frequency band division manner in the embodiment is not limited, and the person skilled in the art can adaptively select according to the actual situation.

In summary, as shown in the above two points, the detection of burst signals in a non-cooperative state needs to face two main problems of unknown frequency band and unknown occurrence time, so that a detection system needs to cover a larger frequency range, and meanwhile, suspicious signals in the frequency range need to be tracked and analyzed in real time; the digital acquisition and processing difficulty of the high-frequency band signals is extremely high, so that the invention can segment and move the signals above 18GHz to the low frequency band for processing; the instantaneous frequency measurement technology is combined with a digital frequency source to serve as a basic structure of a local oscillator, so that the frequency band of a burst communication signal possibly existing is tracked and intercepted; finally, the judgment of the sudden signal is completed by utilizing the digital channelizing and frequency template triggering technology.

Because the real-time tracking and capturing of the short-time burst signal in the bandwidth range of 1 GHz-50 Ghz are difficult to realize in a single channel, the key point of the invention for solving the problem is as follows:

1) Decomposing a wider frequency band into a plurality of smaller frequency bands for processing;

2) The higher frequency band is moved to the lower frequency band for processing by the superheterodyne technology;

3) The instantaneous frequency measurement technology is adopted to eliminate useless signals in a wider frequency band to be measured, and the processing capacity is concentrated in a narrower range.

Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims

1. A short burst ultra wideband acquisition receiver, comprising:

2. The short-time burst signal ultra-wideband capture receiver of claim 1, wherein the antenna group module comprises N antenna group sub-modules of different frequency bands, the antenna group sub-modules of each frequency band comprising an antenna, a low noise amplifier and a primary filter connected in sequence; wherein,

3. The short-time burst signal ultra-wideband capture receiver of claim 2, wherein the superheterodyne down-conversion module comprises a secondary mixer, a secondary filter, and a local oscillation source; wherein,

4. The short-time burst signal ultra-wideband capture receiver of claim 3, wherein the frequency tracking module comprises a power divider, an instantaneous frequency detector, a digital tracking frequency source, a three-stage mixer, and a three-stage filter; wherein,

5. The short-time burst signal ultra-wideband capture receiver of claim 4, wherein the data processing module comprises an AD conversion component, a channelization and spectrum analysis component, and a frequency template triggering component, connected in sequence; wherein,

6. The short-time burst ultra-wideband acquisition receiver of claim 5, wherein the sampling frequency of the AD conversion component is adapted to a range of frequency bins of the data processing frequency band.

7. The short-time burst signal ultra-wideband acquisition receiver of claim 5, wherein the band-pass filtering frequency band parameters of the primary filter are the same as the frequency band interval range of the frequency band in which the captured radio frequency signal is located;

8. The short-time burst signal ultra-wideband capture receiver of any one of claims 1-7, further comprising a data storage module for storing spectral analysis results corresponding to short-time burst signals when the short-time burst signals are discriminated.

9. The short-time burst signal ultra-wideband acquisition receiver of claim 1, wherein the low frequency band comprises a frequency band having a frequency range of 1GHz to 2GHz;

10. The short-time burst signal ultra-wideband acquisition receiver of claim 9, wherein the data processing frequency band has a frequency band parameter of 0.3GHz to 2.3GHz.