A short-burst signal ultra-wideband capture receiver

Abstract

The present application relates to a kind of short time burst signal ultra-wideband capture receiver, belong to short time burst signal capture technical field, solve the problem that existing capture mode is easy to miss short time burst signal.The receiver includes: antenna group module, for capturing N different frequency band radio frequency signals, the frequency of the N different frequency band radio frequency signals is sequentially increasing and continuous;The N different frequency bands are divided into low frequency band, mid frequency band and high frequency band;N signal processing channels, each signal processing channel processes the radio frequency signal of a frequency band;The signal processing channel corresponding to low frequency band includes data processing module;The signal processing channel corresponding to mid frequency band includes sequentially connected frequency tracking module and data processing module;The signal processing channel corresponding to high frequency band includes sequentially connected superheterodyne frequency reduction module, frequency tracking module and data processing module.

Description

Technical Field

[0001] This invention relates to the field of short burst signal acquisition technology, and more particularly to a short burst signal ultrawideband acquisition receiver. Background Technology

[0002] Short burst signals are a type of sudden communication signal, characterized by their random occurrence and short pulse width, typically less than 1 second. This gives them strong anti-reconnaissance capabilities, making them commonly used in covert communications, such as submarine communications. Due to these characteristics, capturing short burst signals without any prior information is extremely difficult for non-cooperative parties. To capture short burst signals under non-cooperative conditions, detection over an ultra-wideband range is necessary to avoid missed detections because the frequency band of the burst signal is unknown.

[0003] Currently, mainstream ultra-wideband spectrum measurement techniques are mainly based on a frequency-sweeping structure of "local oscillator scanning + intermediate frequency filtering". However, this frequency-sweeping structure has an unavoidable problem: the local oscillator signal is periodically scanned in a certain step, and signals outside the scan band cannot be detected. This detection mode is suitable for steady-state signals, but not for the detection of non-steady-state signals such as short-time burst signals and frequency-hopping signals.

[0004] In addition, researchers have proposed a technical solution of "real-time spectrum analysis of full-band signals" to overcome the signal detection omission problem caused by frequency sweep mode. However, this approach has the following problems: limited by the sampling capability of the ADC and the processing capability of the FPGA, this solution can only capture burst signals in a specific frequency band and cannot capture burst signals under ultra-wideband (1GHz to 50GHz) conditions. Therefore, when the frequency band of non-cooperative short-time burst signals is unknown, it may lead to the omission of out-of-band signals. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide an ultra-wideband acquisition receiver for short burst signals to solve the problem that existing acquisition methods are prone to missing short burst signals.

[0006] This invention discloses an ultra-wideband acquisition receiver for short burst signals, comprising:

[0007] An antenna module is used to capture radio frequency signals in N different frequency bands, wherein the frequencies of the N different frequency bands are sequentially increasing and continuous; the N different frequency bands are divided into low frequency band, mid frequency band and high frequency band;

[0008] There are N signal processing channels, each processing a frequency band of radio frequency (RF) signals. The signal processing channel corresponding to the low-frequency band includes a data processing module; the signal processing channel corresponding to the mid-frequency band includes a frequency tracking module and a data processing module connected in sequence; the signal processing channel corresponding to the high-frequency band includes a superheterodyne downsampling module, a frequency tracking module, and a data processing module connected in sequence. The superheterodyne downsampling module is used to shift the high-frequency RF signal captured by the antenna to the mid-frequency band. The frequency tracking module is used to shift the RF signal shifted to the mid-frequency band, or the RF signal captured by the antenna in the mid-frequency band, to the data processing frequency band. The data processing module is used to identify and capture short-duration burst signals from the RF signal shifted to the data processing frequency band, or the RF signal captured by the antenna in the low-frequency band.

[0009] Based on the above solution, the present invention also makes the following improvements:

[0010] Furthermore, the antenna module includes N antenna sub-modules for different frequency bands, and each frequency band antenna sub-module includes an antenna, a low-noise amplifier, and a first-stage filter connected in sequence; wherein,

[0011] The input of the low-noise amplifier is used to receive the raw signal of the current frequency band captured by the antenna. The output of the low-noise amplifier is connected to the input of the first-stage filter. The output of the first-stage filter outputs the radio frequency signal of the current frequency band captured by the antenna.

[0012] Furthermore, the superheterodyne down-conversion module includes a two-stage mixer, a two-stage filter, and a local oscillator; wherein,

[0013] The first input of the two-stage mixer is used to receive the radio frequency signal of the corresponding frequency band; the second input of the two-stage mixer is connected to the local oscillator of the corresponding frequency band; the output of the two-stage mixer is connected to the input of the two-stage filter; and the output of the two-stage filter is used to output the radio frequency signal shifted to the intermediate frequency band.

[0014] Furthermore, the frequency tracking module includes a power divider, an instantaneous frequency meter, a digital tracking frequency source, a three-stage mixer, and a three-stage filter; wherein,

[0015] The input of the power divider is used to receive radio frequency signals shifted to the intermediate frequency band, or radio frequency signals in the intermediate frequency band captured by the antenna;

[0016] The first output of the power divider is connected to the first input of the three-stage mixer, the second output of the power divider is connected to the input of the instantaneous frequency meter, the output of the instantaneous frequency meter is connected to the input of the digital tracking frequency source, and the output of the digital tracking frequency source is connected to the second input of the three-stage mixer.

[0017] The output of the three-stage mixer is connected to the input of the three-stage filter, and the output of the three-stage filter is used to output the radio frequency signal shifted to the data processing frequency band.

[0018] Furthermore, the data processing module includes an AD conversion component, a channelization and spectrum analysis component, and a frequency template triggering component connected in sequence; wherein,

[0019] AD conversion components are used to perform analog-to-digital conversion on radio frequency signals shifted to the data processing frequency band or on low-frequency radio frequency signals captured by the antenna;

[0020] The channelization and spectrum analysis component is used to divide the digital signal after analog-to-digital conversion into multiple narrowbands, and perform spectrum analysis on the signal in each narrowband to obtain the corresponding spectrum analysis results.

[0021] The frequency template triggering component is used to trigger the frequency template based on the spectrum analysis results to determine whether there is a short burst signal.

[0022] Furthermore, the sampling frequency of the AD conversion component is adapted to the frequency band range of the data processing frequency band.

[0023] Furthermore, the bandpass filtering frequency band parameters of the first-stage filter are the same as the frequency band range of the captured radio frequency signal.

[0024] The bandpass filtering frequency band parameters of the secondary filter are the same as the frequency band range shifted to the mid-frequency band;

[0025] The bandpass filtering frequency band parameters of the three-stage filter are the same as the frequency band range moved to the data processing frequency band.

[0026] Furthermore, the receiver also includes a data storage module, used to store the spectrum analysis results corresponding to the short burst signal when the short burst signal is identified.

[0027] Furthermore, the low-frequency band includes a frequency band with a frequency range of 1 GHz to 2 GHz;

[0028] The mid-frequency band includes a frequency band ranging from 2 GHz to 18 GHz;

[0029] The high-frequency band includes two frequency bands, with frequency ranges of 18GHz to 34GHz and 34GHz to 50GHz, respectively.

[0030] Furthermore, the frequency band parameters of the data processing frequency band are 0.3GHz to 2.3GHz.

[0031] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0032] 1) The ultra-wideband acquisition receiver for short burst signals provided by the present invention divides the frequency band into multiple frequency bands and moves the higher frequency band to the lower frequency band for processing through superheterodyne technology. It also uses instantaneous frequency measurement technology to eliminate useless signals in a wider range of test frequency bands, thus concentrating the processing capability in a narrower range and effectively solving the problem of acquisition of non-cooperative short burst signals in the 1GHz to 50GHz frequency band.

[0033] 2) The ultra-wideband acquisition receiver for short burst signals provided by the present invention effectively overcomes the problem of missed detection of short burst signals in the frequency sweep mode of "local oscillator scanning + intermediate frequency filtering", and improves the detection accuracy of short burst signals.

[0034] 3) The receiver in this invention can achieve ultra-wideband acquisition of short burst signals under non-cooperative conditions, which is of great significance for anti-submarine warfare and other aspects.

[0035] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0036] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0037] Figure 1 This is a schematic diagram of the structure of a short burst signal ultrawideband acquisition receiver provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of a short burst signal ultrawideband acquisition receiver divided into four frequency bands according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of the antenna module 1 provided in an embodiment of the present invention.

[0040] Figure label:

[0041] 1-Antenna group module; 2-Superheterodyne down-frequency module; 3-Frequency tracking module; 4-Data processing module; 5-Data storage module. Detailed Implementation

[0042] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0043] This invention provides an ultra-wideband acquisition receiver for short burst signals, as shown in the schematic diagram below. Figure 1 As shown, it includes:

[0044] Antenna module 1 is used to capture radio frequency signals in N different frequency bands, wherein the frequencies of the N different frequency bands are sequentially increasing and continuous; the N different frequency bands are divided into low frequency band, mid frequency band and high frequency band;

[0045] There are N signal processing channels, each processing a frequency band of radio frequency signals; the low-frequency band signal processing channel includes a data processing module 4; the mid-frequency band signal processing channel includes a frequency tracking module 3 and a data processing module 4 connected in sequence; the high-frequency band signal processing channel includes a superheterodyne down-conversion module 2, a frequency tracking module 3, and a data processing module 4 connected in sequence. Figure 1 In the example, each of the low-frequency band, mid-frequency band, and high-frequency band includes one frequency band. Specifically, the superheterodyne downsampling module 2 is used to shift the high-frequency RF signal captured by the antenna to the mid-frequency band; the frequency tracking module 3 is used to shift the RF signal shifted to the mid-frequency band, or the RF signal captured by the antenna in the mid-frequency band, to the data processing frequency band; and the data processing module 4 is used to identify and capture short-duration burst signals from the RF signal shifted to the data processing frequency band, or the RF signal captured by the antenna in the low-frequency band.

[0046] The following is a detailed description of each module involved in this embodiment:

[0047] (1) Antenna module 1

[0048] Objective: To receive ultra-wideband radio frequency signals that may contain short bursts of signal within space.

[0049] Antenna module 1 includes N antenna sub-modules for different frequency bands. Each frequency band antenna sub-module includes an antenna, a low-noise amplifier, and a first-stage filter connected in sequence. The input of the low-noise amplifier receives the raw signal of the current frequency band captured by the antenna. The output of the low-noise amplifier is connected to the input of the first-stage filter, and the output of the first-stage filter outputs the radio frequency signal of the current frequency band captured by the antenna. In this embodiment, a bandpass filter is used as the first-stage filter. The bandpass filter frequency band parameters of the first-stage filter are the same as the frequency band range of the captured radio frequency signal. Specifically, the bandpass filter frequency band parameters of the first-stage filter are the bandpass filter range formed by the upper and lower frequency limits of the bandpass filter.

[0050] For example, in this embodiment, considering that short-duration burst signals may occur over a wide frequency range, the ultra-wideband range designed in this embodiment is 1GHz to 50GHz to effectively capture short-duration burst signals. Preferably, in this embodiment, the frequency ranges of the first to fourth frequency bands are divided as follows: the frequency range of the first frequency band is 1GHz to 2GHz, the frequency range of the second frequency band is 2GHz to 18GHz, the frequency range of the third frequency band is 18GHz to 34GHz, and the frequency range of the fourth frequency band is 34GHz to 50GHz. Wherein, the first frequency band is a low-frequency band, the second frequency band is a mid-frequency band, and the third and fourth frequency bands are high-frequency bands. The structural schematic diagram of the ultra-wideband short-duration burst signal acquisition receiver is as follows: Figure 2 As shown. It should be emphasized that the preferred frequency band allocation method in this embodiment has the following advantages:

[0051] 1) The 1GHz to 2GHz frequency band is relatively low and is more prone to harmonic interference, so this frequency band is extracted as a separate channel;

[0052] 2) In the remaining 3 frequency bands, each approximately 16GHz, the devices involved in this solution have all been practically verified and are feasible;

[0053] 3) The design of the last three channels is basically the same. In actual production, the power divider and the subsequent components are exactly the same. Only three sets of the same hardware need to be produced, which effectively reduces the production difficulty.

[0054] At this time, the structural diagram of antenna module 1 is as follows: Figure 3 As shown, during implementation, antenna module 1 receives radio frequency signals in the 1GHz to 50GHz frequency band in space. After passing through four antennas of different frequency bands, low noise amplifiers, and first-stage filters in antenna module 1, four analog signals are output: 1GHz to 2GHz, 2GHz to 18GHz, 18GHz to 34GHz, and 34GHz to 50GHz.

[0055] To detect the presence of short-duration trigger burst signals in each frequency band, the receiver is equipped with a signal processing channel matched to each frequency band. Each signal processing channel processes the radio frequency signals of one frequency band. For example... Figure 1 As shown, the signal processing channel of the first frequency band (located in the low frequency band) only includes the data processing module 4; the signal processing channel of the second frequency band (located in the mid frequency band) includes the frequency tracking module 3 and the data processing module 4 connected in sequence; the signal processing channels of the third and fourth frequency bands (located in the high frequency band) include the superheterodyne down-conversion module 2, the frequency tracking module 3 and the data processing module 4 connected in sequence.

[0056] (2) Superheterodyne down-conversion module 2

[0057] Objective: The received signals in the 18GHz-34GHz and 34GHz-50GHz high-frequency bands are not conducive to subsequent digital acquisition and analysis due to their relatively high frequencies. Therefore, it is necessary to move the signals in these two frequency bands to a lower frequency band.

[0058] The superheterodyne down-conversion module includes a two-stage mixer, a two-stage filter, and a local oscillator. The first input of the two-stage mixer is used to receive the radio frequency signal of the corresponding frequency band. The second input of the two-stage mixer is connected to the local oscillator of the corresponding frequency band. The output of the two-stage mixer is connected to the input of the two-stage filter. The output of the two-stage filter is used to output the radio frequency signal shifted to the intermediate frequency band.

[0059] In this embodiment, the local oscillator source for each frequency band needs to be adapted to the frequency band of the received radio frequency signal. Taking the four frequency bands divided in this embodiment as an example, the local oscillator frequency of the local oscillator source in the third frequency band is 16GHz, and the local oscillator frequency of the local oscillator source in the fourth frequency band is 32GHz; the secondary filter is also a bandpass filter, and its bandpass filter frequency band parameters are the same as the frequency band range shifted to the mid-frequency band. In the specific implementation process, the superheterodyne reception principle is adopted to mix the signals of the 18GHz~34GHz and 34GHz~50GHz frequency bands with the local oscillator sources with local oscillator frequencies of 16GHz and 32GHz, respectively, and select two signals of the 2GHz~18GHz frequency band through the secondary filters of the corresponding frequency bands.

[0060] (3) Frequency tracking module 3

[0061] Objective: Since there may be short-term bursts of signals in the obtained 2GHz to 18GHz frequency band, this module will move the frequency band where short-term bursts of signals may exist to the data processing frequency band.

[0062] Frequency tracking module 3 includes a power divider, an instantaneous frequency meter, a digital tracking frequency source, a three-stage mixer, and a three-stage filter. The power divider's input receives RF signals shifted to the intermediate frequency (IF) band or RF signals captured by an antenna in the IF band. The power divider's first output is connected to the first input of the three-stage mixer, its second output is connected to the input of the instantaneous frequency meter, the output of the instantaneous frequency meter is connected to the input of the digital tracking frequency source, and the output of the digital tracking frequency source is connected to the second input of the three-stage mixer. The output of the three-stage mixer is connected to the input of the three-stage filter, and the output of the three-stage filter outputs the RF signal shifted to the data processing frequency band. The three-stage filter is also a bandpass filter, and its bandpass filter frequency band parameters are the same as the frequency range shifted to the data processing frequency band.

[0063] For example, the data processing frequency band ranges from 0.3GHz to 2.3GHz. The reason for moving to this data processing frequency band is as follows: Currently, the maximum sampling frequency of relatively mature ADC chips is 5Gsps. Chips with higher sampling rates also exist, but their applications are not yet particularly mature and stable. Therefore, according to the Nyquist sampling theorem, the maximum signal that can be sampled here is 2.5GHz. However, signals in lower frequency bands have relatively high noise. Therefore, in this design, some redundancy has been designed in the low-frequency range and near 2.5GHz, hence the choice of the 0.3GHz to 2.3GHz frequency band. Therefore, if an ADC chip with other sampling rates is used, this parameter of 0.3GHz to 2.3GHz can also be changed.

[0064] In the specific implementation process, the input 2GHz to 18GHz frequency band signal is first divided into two paths, A and B, using a power divider. The A path signal is measured by an instantaneous frequency meter to obtain frequency information with a strong signal amplitude. This information is then sent to a digital tracking frequency source, which generates a local oscillator signal for that frequency. The generated local oscillator signal is mixed and filtered with the B path signal to shift the frequency band that may contain burst signals in the original signal to the 0.3GHz to 2.3GHz frequency band.

[0065] (4) Data Processing Module 4

[0066] The data processing module includes, in sequence, an AD conversion component, a channelization and spectrum analysis component, and a frequency template triggering component; among which,

[0067] The AD conversion component is used to perform analog-to-digital conversion on radio frequency signals shifted to the data processing frequency band or on low-frequency radio frequency signals captured by the antenna; to adapt to the analog-to-digital conversion process of the signal, the sampling frequency of the AD conversion component is adapted to the frequency band range of the data processing frequency band;

[0068] The channelization and spectrum analysis component is used to divide the digital signal after analog-to-digital conversion into multiple narrowbands, and perform spectrum analysis on the signal in each narrowband to obtain the corresponding spectrum analysis results.

[0069] The frequency template triggering component is used to trigger the frequency template based on the spectrum analysis results to determine whether there is a short burst signal.

[0070] For example, the AD conversion component can be implemented using an ADC chip, the channelization and spectrum analysis components can be implemented using an FPGA chip, and the frequency template triggering component can be implemented using a DSP chip. In specific implementation...

[0071] The received analog signals are collected using an AD conversion component (sampling rate not less than 5GSPS), and the resulting digital signals are sent to the channelization and spectrum analysis component (FPGA chip).

[0072] The channelization and spectrum analysis components first perform channelization processing, dividing the 2GHz bandwidth signal evenly into 2... n The algorithm divides the spectrum into narrow bands and performs spectral analysis within each band to obtain the final spectral analysis results. The selection of 'n' is not strictly required; it is mainly defined based on FPGA performance and the desired frequency band width. Currently, FPGA performance is generally sufficient, so users can design according to their actual needs without specific constraints. Spectral analysis primarily involves FFT calculations. After obtaining the spectrum, no reconstruction is needed; instead, frequency template triggering is used to determine the presence of short-duration burst signals.

[0073] In the frequency template triggering component, frequency template triggering technology is used to determine whether a short-duration burst signal exists. For example, from the appearance to the end of the signal, frequency template triggering is performed on the spectral analysis results of each frame, and the following judgment is executed:

[0074] From the appearance to the end of the signal, frequency template trigger judgment is performed on the spectrum analysis results of each frame to determine whether a short burst signal exists. If not, the subsequent processing and storage of that segment of the signal are stopped directly. If it exists, the start and end of the burst signal are determined by combining the judgment result Y of the current frame and the judgment result X of the previous frame. The judgment table is as follows:

[0075]

[0076] The duration of consecutive frames with a determination result of 1 is calculated. If the duration is less than the preset duration, a short burst signal exists; otherwise, no short burst signal exists.

[0077] For example, based on the characteristic that short burst signals have a short duration, usually no more than 1 second, it is necessary to calculate the duration of the number of frames with a continuous judgment result of 1. When the duration is greater than 1 second (this value can be modified according to the actual application scenario), it is judged as a non-short burst signal.

[0078] In addition, the receiver may also include a data storage module 5 (e.g., a "high-performance memory") for storing the spectrum analysis results corresponding to the short burst signal when the short burst signal is identified.

[0079] Therefore, in the four data processing sub-modules in data processing module 4, the input signal can be a 1GHz to 2GHz analog signal or a 0.3GHz to 2.3GHz analog signal. After digital acquisition, digital channelization and spectrum analysis are performed in the FPGA, followed by frequency template trigger detection and frame length discrimination to determine the presence and duration of short burst signals. Finally, the captured short burst signals are stored in a high-performance memory.

[0080] To facilitate a better understanding of the solution in this embodiment, taking the frequency band allocation method described above as an example, the workflow of the ultra-wideband acquisition receiver for short burst signals provided in this embodiment is summarized as follows:

[0081] 1) The antenna group consisting of four antennas receives signals in the 1GHz to 50GHz frequency band and processes the four signals in steps 2 to 5 respectively;

[0082] 2) The signal quality of the 1GHz to 2GHz signal is improved by using a low-noise amplifier and filter to form the first analog signal;

[0083] 3) The signal quality of the 2GHz to 18GHz signal is improved by using a low-noise amplifier and filter, and a second analog signal with a bandwidth of 2GHz is formed by using a frequency tracking module, which may include burst signals;

[0084] 4) The signal quality of the 18GHz to 34GHz signal is improved by using a low-noise amplifier and filter. The signal frequency is reduced to the 2GHz to 18GHz band by using a superheterodyne down-frequency module with a local oscillator frequency of 16GHz. Then, a frequency tracking module is used to form a third analog signal with a bandwidth of 2GHz that may include burst signals.

[0085] 5) The signal quality of the 34GHz to 50GHz signal is improved by using a low-noise amplifier and filter. The signal frequency is reduced to the 2GHz to 18GHz band by using a superheterodyne down-frequency module with a local oscillator frequency of 32GHz. Then, the signal is processed by a frequency tracking module to form a fourth analog signal with a bandwidth of 2GHz that may include burst signals.

[0086] 6) The above four signals are digitally acquired by ADC sampling chips, digital channelization and spectrum analysis are performed by FPGA, and frequency template triggering and frame length discrimination are performed by DSP chips to realize the identification and capture of short burst signals.

[0087] 7) Store data frames containing short burst signals on high-performance memory.

[0088] Finally, it should be noted that the division of N different frequency bands can be selected as needed and is not limited to the method given in this embodiment. 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 1GHz to 1.4GHz, the frequency range of the second frequency band is 1.4GHz to 17.6GHz, the frequency range of the third frequency band is 17.6GHz to 33.8GHz, and the frequency range of the fourth frequency band is 33.8GHz to 50GHz. Among them, the first frequency band is the low frequency band, the second frequency band is the mid frequency band, and the third and fourth frequency bands are the high frequency bands. After processing by the superheterodyne down-conversion module 2, the signals of the third and fourth frequency bands are shifted to 1.4GHz to 17.6GHz. In this process, the local oscillator frequency of the local oscillator source of the third frequency band can be 16.2GHz, and the local oscillator frequency of the local oscillator source of the fourth frequency band can be 32.2GHz. After processing by frequency tracking module 3, the data processing frequency band to which the signal is moved can be designed to be 0.2GHz to 2.23GHz. This still meets the sampling frequency requirements of the AD conversion component. For example, three frequency bands can be divided as follows: the first band ranges from 1GHz to 2GHz, the second band from 2GHz to 26GHz, and the third band from 26GHz to 50GHz. The first band is a low-frequency band, the second band is a mid-frequency band, and the third band is a high-frequency band. After processing by superheterodyne downsampling module 2, the signal in the third band is moved to 2GHz to 26GHz. During this process, the local oscillator frequency of the third band's local oscillator source can be 24GHz. After processing by frequency tracking module 3, the data processing frequency band to which the signal is moved can still be designed to be 0.3GHz to 2.3GHz. Therefore, the frequency band division method in this embodiment is not limited, and those skilled in the art can make adaptive choices based on actual conditions.

[0089] In summary, detecting burst signals in a non-cooperative state faces two main challenges: unknown frequency bands and unknown occurrence times. Therefore, the detection system needs to cover a wide frequency range and perform real-time tracking and analysis of suspicious signals within that range. Based on these two considerations, this invention employs an antenna array ranging from 1 GHz to 50 GHz to receive signals over a wide frequency range. Digital acquisition and processing of high-frequency signals is extremely difficult; therefore, this invention segments signals above 18 GHz and moves them to lower frequency bands for processing. Instantaneous frequency measurement technology combined with a digital frequency source is used as the basic structure of the local oscillator to track and intercept frequency bands where burst communication signals may exist. Finally, digital channelization and frequency template triggering technology are used to determine the burst signal.

[0090] Since it is difficult to achieve real-time tracking and capture of short burst signals within a bandwidth range of 1GHz to 50GHz using a single channel, the key point of this invention to solve this problem is:

[0091] 1) Decompose a wide frequency band into multiple smaller frequency bands for processing;

[0092] 2) The higher frequency band is shifted to the lower frequency band for processing using superheterodyne technology;

[0093] 3) Use instantaneous frequency measurement technology to eliminate useless signals in a wider range of test frequencies, and concentrate processing capabilities on a narrower range.

[0094] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0095] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A short burst signal ultrawideband acquisition receiver, characterized in that, include: An antenna module is used to capture radio frequency signals in N different frequency bands, wherein the frequencies of the N different frequency bands are sequentially increasing and continuous; the N different frequency bands are divided into low frequency band, mid frequency band and high frequency band; There are N signal processing channels, each processing a frequency band of radio frequency (RF) signals. The low-frequency band signal processing channel includes a data processing module; the mid-frequency band signal processing channel includes a frequency tracking module and a data processing module connected in sequence; the high-frequency band signal processing channel includes a superheterodyne downsampling module, a frequency tracking module, and a data processing module connected in sequence. The superheterodyne downsampling module is used to shift the high-frequency RF signal captured by the antenna to the mid-frequency band. The frequency tracking module is used to shift the shifted RF signal to the mid-frequency band, or the mid-frequency RF signal captured by the antenna, to the data processing frequency band. The data processing module is used to identify and capture short-duration burst signals from the shifted RF signal to the data processing frequency band, or the low-frequency RF signal captured by the antenna. The data processing module includes, in sequence, an AD conversion component, a channelization and spectrum analysis component, and a frequency template triggering component; wherein, AD conversion components are used to perform analog-to-digital conversion on radio frequency signals shifted to the data processing frequency band or on low-frequency radio frequency signals captured by the antenna; The channelization and spectrum analysis component is used to divide the digital signal after analog-to-digital conversion into multiple narrowbands, and perform spectrum analysis on the signal in each narrowband to obtain the corresponding spectrum analysis results. The frequency template triggering component is used to trigger the frequency template based on the spectrum analysis results to determine whether there is a short burst signal. In the frequency template triggering component, from the appearance of the signal to the end of the signal, the frequency template triggering judgment is performed on the spectrum analysis results of each frame to determine whether there is a short burst signal. If there is no short burst signal, the subsequent processing and storage of the signal segment are stopped directly. If there is a short burst signal, the start and end of the burst signal are determined by combining the judgment result Y of the current frame and the judgment result X of the previous frame. The duration of consecutive frames with a determination result of 1 is calculated. If the duration is less than the preset duration, a short burst signal exists; otherwise, no short burst signal exists. Where both X and Y are equal to 0, the judgment result is no signal; X equals 0 and Y equals 1, indicating that a signal has been detected; When X equals 1 and Y equals 0, it indicates the signal has ended; X equals 1 and Y equals 1, indicating that the signal is held; 0 indicates that it does not exist, and 1 indicates that it exists.

2. The ultra-wideband acquisition receiver for short burst signals according to claim 1, characterized in that, The antenna module includes N antenna sub-modules for different frequency bands. Each frequency band antenna sub-module includes an antenna, a low-noise amplifier, and a first-stage filter connected in sequence. The input of the low-noise amplifier is used to receive the raw signal of the current frequency band captured by the antenna. The output of the low-noise amplifier is connected to the input of the first-stage filter. The output of the first-stage filter outputs the radio frequency signal of the current frequency band captured by the antenna.

3. The ultra-wideband acquisition receiver for short burst signals according to claim 2, characterized in that, The superheterodyne down-conversion module includes a two-stage mixer, a two-stage filter, and a local oscillator; wherein... The first input of the two-stage mixer is used to receive the radio frequency signal of the corresponding frequency band; the second input of the two-stage mixer is connected to the local oscillator of the corresponding frequency band; the output of the two-stage mixer is connected to the input of the two-stage filter; and the output of the two-stage filter is used to output the radio frequency signal shifted to the intermediate frequency band.

4. The ultra-wideband acquisition receiver for short burst signals according to claim 3, characterized in that, The frequency tracking module includes a power divider, an instantaneous frequency meter, a digital tracking frequency source, a three-stage mixer, and a three-stage filter; wherein... The input of the power divider is used to receive radio frequency signals shifted to the intermediate frequency band, or radio frequency signals in the intermediate frequency band captured by the antenna; The first output of the power divider is connected to the first input of the three-stage mixer, the second output of the power divider is connected to the input of the instantaneous frequency meter, the output of the instantaneous frequency meter is connected to the input of the digital tracking frequency source, and the output of the digital tracking frequency source is connected to the second input of the three-stage mixer. The output of the three-stage mixer is connected to the input of the three-stage filter, and the output of the three-stage filter is used to output the radio frequency signal shifted to the data processing frequency band.

5. The ultra-wideband acquisition receiver for short burst signals according to claim 4, characterized in that, The sampling frequency of the AD conversion component is adapted to the frequency band range of the data processing frequency band.

6. The ultra-wideband acquisition receiver for short burst signals according to claim 5, characterized in that, The bandpass filtering frequency band parameters of the first-stage filter are the same as the frequency band range of the captured radio frequency signal. The bandpass filtering frequency band parameters of the secondary filter are the same as the frequency band range shifted to the mid-frequency band; The bandpass filtering frequency band parameters of the three-stage filter are the same as the frequency band range moved to the data processing frequency band.

7. The ultra-wideband acquisition receiver for short burst signals according to any one of claims 1-6, characterized in that, The receiver also includes a data storage module, which stores the spectrum analysis results corresponding to the short burst signal when the short burst signal is identified.

8. The ultra-wideband acquisition receiver for short burst signals according to claim 1, characterized in that, The low-frequency band includes a frequency band with a frequency range of 1 GHz to 2 GHz; The mid-frequency band includes a frequency band ranging from 2 GHz to 18 GHz; The high-frequency band includes two frequency bands, with frequency ranges of 18GHz~34GHz and 34GHz~50GHz, respectively.

9. The ultra-wideband acquisition receiver for short burst signals according to claim 8, characterized in that, The frequency band parameters for the data processing frequency band are 0.3GHz to 2.3GHz.

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