CN112187294B - Configurable multi-frequency-point short burst spread spectrum signal receiving device - Google Patents
Configurable multi-frequency-point short burst spread spectrum signal receiving device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
The invention discloses a configurable multi-frequency-point short burst spread spectrum signal receiving device, and belongs to the technical field of short burst spread spectrum signal receiving. The single-channel short burst spread spectrum receiver comprises a parameter-configurable down-conversion module, a parameter-configurable capturing module and a parameter-configurable tracking module, and realizes the receiving of single-channel short burst spread spectrum signals with different frequency points through different parameter configurations. The invention realizes the signal receiving of a plurality of frequency points by utilizing a channel with configurable parameters, thus realizing the short burst spread spectrum signal receiving processing of a plurality of frequency points by only needing the resource of one channel, and effectively solving the problem of excessive resource occupation.
Description
Technical Field
The invention relates to the technical field of short burst spread spectrum signal receiving, in particular to a configurable multi-frequency-point short burst spread spectrum signal receiving device.
Background
Short burst spread spectrum signals have "short-time" and "burstiness," which vary in duration from tens of milliseconds to seconds. Due to the variable time of arrival of the signal, the continuous spread spectrum signal reception technique is not suitable for short burst spread spectrum signals. A short burst spread spectrum signal is typically composed of a synchronization segment, a tracking segment, and a data segment. The synchronous section is used for capturing signals, the tracking section is used for tracking the signals into lock, and the data section is used for transmitting information. The tracking segment is sometimes not present, and the acquisition of the signal and the tracking into the lock need to be completed in the synchronization segment. The purpose of signal transmission and reception is to transmit information, and due to the "short-term" of the signal, the synchronization segment and the tracking segment are not usually very long, and most of the time is in transmitting information. Due to the 'burstiness' of the signal, whether the signal arrives or not needs to be detected in real time, the Doppler of the signal is estimated at the same time, and a tracking loop needs to be completely locked before a data section arrives, so that the demodulation of information is completed.
Due to the characteristics of the short burst spread spectrum signal, a large amount of resources are occupied when the short burst spread spectrum signal is captured, tracked and demodulated, and if the short burst spread spectrum signal of a plurality of frequency points needs to be received and processed, the resources can be multiplied.
Disclosure of Invention
In view of the above, the present invention provides a configurable multi-frequency short burst spread spectrum signal receiving apparatus, which only needs the resource of one channel to implement the receiving processing of the short burst spread spectrum signal of multiple frequency points, so as to effectively solve the problem of excessive resource occupation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a configurable multi-frequency-point short burst spread spectrum signal receiving device comprises a down-conversion module, an AD sampling module, a capturing module and a tracking module; wherein the content of the first and second substances,
short burst radio frequency signals firstly enter a down-conversion module, the down-conversion module carries out frequency point shifting on the short burst radio frequency signals from radio frequency to intermediate frequency, aiming at the short burst radio frequency signals with different frequency points, the down-conversion module shifts the short burst radio frequency signals to a required intermediate frequency range by setting down-conversion local oscillators and filter parameters, the down-conversion module inputs the intermediate frequency signals into an AD sampling module, the AD sampling module carries out digital processing on analog signals, digital signals are output to a capturing module and a tracking module, the capturing module carries out capturing processing on the intermediate frequency digital signals, the Doppler and signal positions of the short burst signals are found out, the information is output to the tracking module, the capturing module completes capturing of the short burst signals with different frequency points through parameter setting, and the tracking module carries out tracking processing on the intermediate frequency number signals according to the Doppler and position information of the signals output by the capturing module, and demodulating required data.
Furthermore, the capturing module comprises a local pseudo code generating module, a Doppler output comparing module and a plurality of variable frequency filtering branches, and each variable frequency filtering branch comprises a digital down converter and a matched filter which are sequentially connected; wherein the content of the first and second substances,
the AD sampling module respectively sends the intermediate frequency digital signals to a plurality of frequency conversion filtering branches, the parameter setting of the digital down-conversion module in each frequency conversion filtering branch is different, the local oscillation frequency point ensures that all frequency conversion filtering branches uniformly cover the Doppler capturing range, the digital down-conversion module moves the intermediate frequency signal to a baseband and outputs the baseband signal to the matched filtering module, the local pseudo code generating module generates a local pseudo code corresponding to the short burst signal to be captured according to the short burst signal to be captured and outputs the pseudo code to the matched filtering module, the matched filtering module performs matched filtering on the local pseudo code and the baseband signal and outputs a filtering result to the Doppler output comparing module, the Doppler output comparing module compares the matched filtering results of the frequency conversion filtering branches, and the Doppler value obtained by the frequency conversion filtering branches exceeding the threshold is output to the tracking module.
Furthermore, the tracking module comprises a local pseudo code generation module, a first delay module, a second delay module, a digital down converter, a loop phase discrimination filtering module and six correlation accumulation modules; wherein the content of the first and second substances,
the AD sampling module sends the intermediate frequency digital signal to the digital down-conversion module, the digital down-conversion module sets down-conversion local oscillator and filter parameters according to the frequency point of the short burst signal to be received, simultaneously moves the intermediate frequency digital signal to a baseband according to the Doppler output by the capture module and the adjustment quantity output by the loop phase discrimination filter module, simultaneously generates two paths of signals I and Q, outputs the signals I to the first to third correlation accumulation modules, outputs the signals Q to the fourth to sixth correlation accumulation modules, the local pseudo code generation module generates a local pseudo code corresponding to the short burst signal to be captured according to the short burst signal to be captured, simultaneously adjusts the speed of the output of the pseudo code according to the adjustment quantity output by the loop phase discrimination filter module, outputs the pseudo code to the first and fourth correlation accumulation modules, and simultaneously outputs the pseudo code to the first delay module, and the first delay module delays the pseudo code and outputs the pseudo code to the second and fifth correlation accumulation modules, and the pseudo code and the carrier adjustment quantity are calculated and respectively output to a digital down-conversion module and a local pseudo code generation module.
Compared with the background technology, the invention has the following advantages:
(1) the invention realizes the receiving of a plurality of frequency point short burst spread spectrum signals by using one receiving channel, effectively solves the problem of excessive occupation of multi-frequency point short burst spread spectrum signal resources, and has the characteristics of novelty and creativity.
(2) The invention can be realized only by carrying out parameter configuration on a plurality of parts of the receiving link, and has the characteristics of simplicity and strong practicability.
Drawings
Fig. 1 is a block diagram of a multi-frequency-point short-burst spread-spectrum signal receiving apparatus according to an embodiment of the present invention.
Fig. 2 is a block diagram showing a specific structure of the acquisition module and the tracking module in fig. 1.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
A configurable multi-frequency-point short burst spread spectrum signal receiving device comprises a down-conversion module, an AD sampling module, a capturing module and a tracking module; wherein the content of the first and second substances,
short burst radio frequency signals firstly enter a down-conversion module, the down-conversion module carries out frequency point shifting on the short burst radio frequency signals from radio frequency to intermediate frequency, aiming at the short burst radio frequency signals with different frequency points, the down-conversion module shifts the short burst radio frequency signals to a required intermediate frequency range by setting down-conversion local oscillators and filter parameters, the down-conversion module inputs the intermediate frequency signals into an AD sampling module, the AD sampling module carries out digital processing on analog signals, digital signals are output to a capturing module and a tracking module, the capturing module carries out capturing processing on the intermediate frequency digital signals, the Doppler and signal positions of the short burst signals are found out, the information is output to the tracking module, the capturing module completes capturing of the short burst signals with different frequency points through parameter setting, and the tracking module carries out tracking processing on the intermediate frequency number signals according to the Doppler and position information of the signals output by the capturing module, and demodulating required data.
Furthermore, the capturing module comprises a local pseudo code generating module, a Doppler output comparing module and a plurality of variable frequency filtering branches, and each variable frequency filtering branch comprises a digital down converter and a matched filter which are sequentially connected; wherein the content of the first and second substances,
the AD sampling module respectively sends the intermediate frequency digital signals to a plurality of frequency conversion filtering branches, the parameter setting of the digital down-conversion module in each frequency conversion filtering branch is different, the local oscillation frequency point ensures that all frequency conversion filtering branches uniformly cover the Doppler capturing range, the digital down-conversion module moves the intermediate frequency signal to a baseband and outputs the baseband signal to the matched filtering module, the local pseudo code generating module generates a local pseudo code corresponding to the short burst signal to be captured according to the short burst signal to be captured and outputs the pseudo code to the matched filtering module, the matched filtering module performs matched filtering on the local pseudo code and the baseband signal and outputs a filtering result to the Doppler output comparing module, the Doppler output comparing module compares the matched filtering results of the frequency conversion filtering branches, and the Doppler value obtained by the frequency conversion filtering branches exceeding the threshold is output to the tracking module.
The tracking module comprises a local pseudo code generation module, a first delay module, a second delay module, a digital down converter, a loop phase discrimination filtering module and six correlation accumulation modules; wherein:
the AD sampling module sends the intermediate frequency digital signal to the digital down-conversion module, the digital down-conversion module sets down-conversion local oscillator and filter parameters according to the frequency point of the short burst signal to be received, simultaneously moves the intermediate frequency digital signal to a baseband according to the Doppler output by the capture module and the adjustment quantity output by the loop phase discrimination filter module, simultaneously generates two paths of signals I and Q, outputs the signals I to the first to third correlation accumulation modules, outputs the signals Q to the fourth to sixth correlation accumulation modules, the local pseudo code generation module generates a local pseudo code corresponding to the short burst signal to be captured according to the short burst signal to be captured, simultaneously adjusts the speed of the output of the pseudo code according to the adjustment quantity output by the loop phase discrimination filter module, outputs the pseudo code to the first and fourth correlation accumulation modules, and simultaneously outputs the pseudo code to the first delay module, and the first delay module delays the pseudo code and outputs the pseudo code to the second and fifth correlation accumulation modules, and the pseudo code and the carrier adjustment quantity are calculated and respectively output to a digital down-conversion module and a local pseudo code generation module.
The device sets down-conversion local oscillators and filter parameters according to the frequency point and the bandwidth of a short burst spread spectrum signal to be received; setting parameters of a capture module according to short burst spread spectrum signals to be received and down-conversion parameters; and sets tracking module parameters according to the short burst spread spectrum signal to be received and the down-conversion parameters.
Wherein, the down-conversion local oscillator fLOThe setting of (A) needs to comprehensively consider the central frequency point f of the short burst spread spectrum signalRFSum bandwidth B and AD sampling rate fSThe short burst spread spectrum signal is converted into an intermediate frequency signal after down conversion, and the central frequency point fIF＝fRF-fLOThe sampling rate, the intermediate frequency point and the signal bandwidth should satisfy the band-pass sampling theorem:
fS≥2B
wherein n is an integer. The sampling rate is usually set to a fixed value, and the signal is ensured to meet the passband sampling theorem by adjusting the down-conversion local oscillator. The passband of the down-conversion filter is to ensure that the signal can pass through without damage, and the parameter setting is based on the down-conversion local oscillator and the signal bandwidth.
The acquisition module parameters mainly comprise digital down-conversion frequency control words and pseudo code generation parameters. Digital intermediate frequency signal frequency point f after samplingIFD＝fIF-fSThe digital down-conversion is required to convert the digital intermediate frequency signal into a baseband signal. Frequency control word N in accordance with system clock fSYSIn conjunction with the digital accumulator bit width M calculation,
pseudo code generation parameters upon receptionThe generated pseudo code is consistent with the pseudo code of the short burst spread spectrum signal to be received.
The tracking module parameters mainly comprise digital down-conversion frequency control words, related accumulation parameters, pseudo code generation parameters and filtering parameters. Digital down conversion frequency control word
The correlation accumulation parameter, i.e., the accumulation time, needs to be rate matched to the symbol carried by the short burst spread spectrum signal, and typically the accumulation time does not exceed the duration of one symbol. The pseudo code generation parameters are consistent with those in the capturing module. The filter parameters refer to pseudo code tracking loop filter parameters and carrier tracking loop filter parameters, which are calculated in relation to the accumulation time.
The structure of the multi-frequency-point short burst spread spectrum signal receiving device is shown in fig. 1 and 2, and mainly comprises a capturing module, a tracking module and an analog channel part before sampling, and the implementation principle is as follows:
the parameters of the down-conversion local oscillator and the filter are set according to the frequency point and the bandwidth of the short burst spread spectrum signal to be received (parameter setting 1). The down-conversion function is to move the radio frequency signal to the intermediate frequency so as to carry out sampling processing on the signal, the moving of the signal frequency spectrum can be realized after the radio frequency signal and the local oscillator are mixed, at the moment, the signal can have up-conversion, down-conversion and harmonic part, therefore, the signal is required to be filtered, and only the required down-conversion part is reserved. Down conversion local oscillator fLOThe setting of (A) needs to comprehensively consider the central frequency point f of the short burst spread spectrum signalRFSum bandwidth B and AD sampling rate fSThe short burst spread spectrum signal is converted into an intermediate frequency signal after down conversion, and the central frequency point fIF＝fRF-fLOThe sampling rate, the intermediate frequency point and the signal bandwidth should satisfy the band-pass sampling theorem:
fS≥2B
wherein n is an integer. The sampling rate is usually set to a fixed value, and the signal is ensured to meet the passband sampling theorem by adjusting the down-conversion local oscillator. The passband of the down-conversion filter is to ensure that the signal can pass through without damage, and the parameter setting is based on the down-conversion local oscillator and the signal bandwidth.
And setting the parameters of the capture module according to the short burst spread spectrum signal to be received and the down-conversion parameters. The capture module mainly comprises digital down-conversion, matched filtering and comparison output Doppler, wherein the number k of the digital down-conversion and the matched filtering is required to be within the range of +/-delta f according to the required DopplerdAnd the length t of the designed matched filtering segment is calculated, and k is more than or equal to (2 delta f)dt +1), and k is an integer. The acquisition module parameters mainly comprise digital down-conversion frequency control words (parameter setting 2) and pseudo code generation parameters (parameter setting 3). Digital intermediate frequency signal frequency point f after samplingIFD＝fIF-fSIn the digital down conversion, the digital intermediate frequency signal is converted into a baseband signal so as to cover the Doppler range +/-delta f required by receivingdEach path of digital down-conversion frequency control word NiI is 0,1, … k-1, in accordance with the system clock fSYSIn conjunction with the digital accumulator bit width M calculation,
the input of the matched filtering is a quasi-baseband signal and a local pseudo code after digital down-conversion, the pseudo code generation parameters are determined according to the pseudo code of the short burst spread spectrum signal to be received, and the generated pseudo code is consistent with the pseudo code of the short burst spread spectrum signal to be received. And comparing the output Doppler to detect whether the result of the multipath matched filtering reaches a capture threshold, if so, determining that the short burst spread spectrum signal is captured, informing a tracking module to start the tracking processing of the signal, and transmitting the Doppler corresponding to the matched filtering exceeding the threshold to the tracking module.
And setting the tracking module parameters according to the short burst spread spectrum signal to be received and the down-conversion parameters. The tracking module mainly comprises digital down-conversion, local pseudo code generation, correlation accumulation and loop phase discrimination filtering. Digital down conversion of digital intermediate frequency signal according to capture resultMoving to a baseband, generating consistent pseudo codes according to the received short burst spread spectrum signal pseudo codes by local pseudo code generation, performing relevant accumulation on IQ data after down-conversion and local advanced, instant and delayed pseudo codes respectively by relevant accumulation, and calculating pseudo code generation adjustment quantity and carrier generation adjustment quantity by loop phase discrimination filtering according to relevant accumulated values. The tracking module parameters mainly comprise digital down-conversion frequency control words (parameter setting 4), related accumulation parameters (parameter setting 5), pseudo code generation parameters (parameter setting 3 and pseudo code generation parameters of the capturing module) and filtering parameters (parameter setting 6). Digital down conversion frequency control word
The correlation accumulation parameter, i.e., the accumulation time, needs to be rate matched to the symbol carried by the short burst spread spectrum signal, and typically the accumulation time does not exceed the duration of one symbol. The pseudo code generation parameters are consistent with those in the capturing module. The filter parameters refer to pseudo code tracking loop filter parameters and carrier tracking loop filter parameters, which are calculated in relation to the accumulation time.
In view of the fact that the short burst spread spectrum signals of different frequency points are different in frequency point, and possibly different in spreading code and data rate, the invention utilizes a channel with configurable parameters to receive the short burst spread spectrum signals of a plurality of frequency points, so that the short burst spread spectrum signals of the plurality of frequency points can be received and processed only by the resource of one channel, and the problem of excessive resource occupation is effectively solved.
It should be noted that the present invention may have other embodiments besides the above-described implementation steps. All technical solutions which adopt equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (3)
1. A configurable multi-frequency-point short burst spread spectrum signal receiving device is characterized by comprising a down-conversion module, an AD sampling module, an acquisition module and a tracking module; wherein the content of the first and second substances,
short burst radio frequency signals firstly enter a down-conversion module, the down-conversion module carries out frequency point shifting on the short burst radio frequency signals from radio frequency to intermediate frequency, aiming at the short burst radio frequency signals with different frequency points, the down-conversion module shifts the short burst radio frequency signals to a required intermediate frequency range by setting down-conversion local oscillators and filter parameters, the down-conversion module inputs the intermediate frequency signals into an AD sampling module, the AD sampling module carries out digital processing on analog signals, digital signals are output to a capturing module and a tracking module, the capturing module carries out capturing processing on the intermediate frequency digital signals, the Doppler and signal positions of the short burst signals are found out, the information is output to the tracking module, the capturing module completes capturing of the short burst signals with different frequency points through parameter setting, and the tracking module carries out tracking processing on the intermediate frequency number signals according to the Doppler and position information of the signals output by the capturing module, and demodulating required data.
2. The configurable multi-frequency-point short-burst spread-spectrum signal receiving device of claim 1, wherein the capturing module comprises a local pseudo-code generating module, a doppler output comparing module, and a plurality of frequency-converting filtering branches, each of which comprises a digital down-converter and a matched filter connected in sequence; wherein the content of the first and second substances,
the AD sampling module respectively sends the intermediate frequency digital signals to a plurality of frequency conversion filtering branches, the parameter setting of the digital down-conversion module in each frequency conversion filtering branch is different, the local oscillation frequency point ensures that all frequency conversion filtering branches uniformly cover the Doppler capturing range, the digital down-conversion module moves the intermediate frequency signal to a baseband and outputs the baseband signal to the matched filtering module, the local pseudo code generating module generates a local pseudo code corresponding to the short burst signal to be captured according to the short burst signal to be captured and outputs the pseudo code to the matched filtering module, the matched filtering module performs matched filtering on the local pseudo code and the baseband signal and outputs a filtering result to the Doppler output comparing module, the Doppler output comparing module compares the matched filtering results of the frequency conversion filtering branches, and the Doppler value obtained by the frequency conversion filtering branches exceeding the threshold is output to the tracking module.
3. The configurable multi-frequency-point short-burst spread-spectrum signal receiving device of claim 2, wherein the tracking module comprises a local pseudo-code generating module, a first delay module, a second delay module, a digital down-converter, a loop phase discrimination filtering module, and six correlation accumulation modules; wherein the content of the first and second substances,
the AD sampling module sends the intermediate frequency digital signal to the digital down-conversion module, the digital down-conversion module sets down-conversion local oscillator and filter parameters according to the frequency point of the short burst signal to be received, simultaneously moves the intermediate frequency digital signal to a baseband according to the Doppler output by the capture module and the adjustment quantity output by the loop phase discrimination filter module, simultaneously generates two paths of signals I and Q, outputs the signals I to the first to third correlation accumulation modules, outputs the signals Q to the fourth to sixth correlation accumulation modules, the local pseudo code generation module generates a local pseudo code corresponding to the short burst signal to be captured according to the short burst signal to be captured, simultaneously adjusts the speed of the output of the pseudo code according to the adjustment quantity output by the loop phase discrimination filter module, outputs the pseudo code to the first and fourth correlation accumulation modules, and simultaneously outputs the pseudo code to the first delay module, and the first delay module delays the pseudo code and outputs the pseudo code to the second and fifth correlation accumulation modules, and the pseudo code and the carrier adjustment quantity are calculated and respectively output to a digital down-conversion module and a local pseudo code generation module.
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