CN108134638B - Multipath radio signal monitoring device - Google Patents
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention is suitable for the field of communication and provides a multipath radio signal monitoring device. The multi-channel radio signal monitoring device comprises a multi-channel ADC module, an ADC channel selection module, a multi-channel orthogonal mixing module, a DDC multi-stage extraction filtering module, a bandwidth selection module, a channel arbitration module, a multi-mode audio demodulation module, a spectrum calculation module connected with the output end of the channel arbitration module, and an ITU parameter measurement module connected with the output end of the spectrum calculation module, wherein the input end of the multi-channel ADC module receives multi-channel intermediate frequency analog signals. The invention can monitor and analyze the multi-path narrow-band signal in the intermediate frequency bandwidth at the same time, and is very flexible and practical; the resource utilization rate is greatly reduced; the bottleneck of multi-channel monitoring engineering realization is solved, and the engineering practical value is high.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a multipath radio signal monitoring device.
Background
As shown in fig. 1, the single-channel radio signal monitoring device in the prior art generally comprises modules such as analog intermediate frequency signal sampling by an ADC, quadrature mixing, decimation filtering, bandwidth selection, audio demodulation, spectrum calculation, ITU parameter measurement, and the like. The technical scheme of multi-channel radio signal monitoring is realized by copying the realization method of single-channel monitoring in fig. 1 for a plurality of times, and the technical scheme of multi-channel radio signal monitoring has the advantages of simple structure, easy realization and debugging and short time consumption for engineering realization. The method has the defects that the calculation resources required by the digital signal processing algorithm are too many when the multi-path radio signal monitoring is realized at the same time, namely, the resources used for realizing N paths of radio signal monitoring are N times of those used for single path radio signal monitoring, when the number of the monitoring channels is very large (such as 32/64 channels), the consumed resources are too much to be accepted, the total bandwidth of the radio signal monitoring is limited, and the cost is very high.
Disclosure of Invention
The invention aims to provide a multi-channel radio signal monitoring device, which aims to solve the problems that the computing resources required by a digital signal processing algorithm are excessive and the total bandwidth of radio monitoring is doubled when the multi-channel radio signal monitoring is realized in the prior art.
The invention provides a multipath radio signal monitoring device, which is characterized by comprising a multipath ADC module, an ADC path selection module, a multipath orthogonal mixing module, a DDC multistage extraction filtering module, a bandwidth selection module, a channel arbitration module, a multimode audio demodulation module, a spectrum calculation module connected with the output end of the channel arbitration module and an ITU parameter measurement module connected with the output end of the spectrum calculation module, wherein the input end of the multipath ADC module receives multipath intermediate frequency analog signals,
the multi-channel ADC module is used for carrying out analog-to-digital conversion processing on the multi-channel intermediate frequency analog signals;
the ADC channel selection module is used for selecting one ADC for the monitoring channel according to the central frequency parameter so as to realize the monitoring central frequency selection;
the multipath orthogonal mixing module is used for multipath parallel orthogonal mixing processing and corresponds to the number of the monitoring channels;
the DDC multistage decimation filter module completes decimation filtering in a time division multiplexing mode and outputs I/Q data with different narrowband bandwidths;
the bandwidth selection module is used for selecting monitoring demodulation bandwidth for each monitoring channel according to the set parameters;
the channel arbitration module is used for arbitrating and selecting the data path;
the multimode audio demodulation module adopts a time-sharing multiplexing and pipeline processing mode, and processes the audio demodulation of one monitoring channel in each clock period;
the frequency spectrum calculation module is used for converting the time domain signals into frequency domain signals to obtain power spectrum data, and the frequency spectrum calculation module completes data processing of a plurality of channels in a time division multiplexing mode;
and the ITU parameter measurement module is used for completing measurement of ITU parameters according to the power spectrum data, and completing data processing of a plurality of channels by adopting a time division multiplexing mode.
Further, the DDC multistage extraction filtering module specifically includes a CIC filter bank, a data sequencing module and a 2-time extraction FIR half-band filter bank which are electrically connected in sequence, the CIC filter bank includes N parallel CIC filters, extraction filtering of N paths of I/Q data after multi-path orthogonal mixing is completed, so that the sampling rate of each path of I/Q data is rapidly reduced to 1/I, I is an extraction multiple, then each path of I/Q data is input into the data sequencing module, the data sequencing module caches each path of I/Q data, then the I/Q data of each path is taken out in a time-sharing manner and sent to the 2-time extraction FIR half-band filter bank, the 2-time extraction FIR half-band filter bank includes M2-time extraction FIR half-band filters connected in series, the M2-time extraction FIR half-band filters connected in series step by step are used for extracting 2-time, and the sampling rate of each stage of the I/Q data output by the later half-band filter is changed to 1/2, and the I/Q data of M groups of different narrow bandwidths are obtained.
Further, the multimode audio demodulation module comprises a data ordering module, a channel selection judging module, a demodulation mode selecting module and a multimode demodulation module which are electrically connected in sequence; the data sorting module is used for mainly arbitrating data of a plurality of channels and inputting polling; the channel selection judging module judges the channels of the data input after sequencing and determines which channel is demodulated; the demodulation mode selection module performs demodulation mode selection on a certain input channel; the multimode demodulation module adopts a module time-sharing multiplexing and pipeline processing mode, and the module time-sharing multiplexing refers to the time-sharing multiplexing of the demodulated universal module.
In the invention, as the multi-channel radio signal monitoring device comprises a DDC multi-stage extraction filtering module, a multi-mode audio demodulation module and a frequency spectrum calculation module, the DDC multi-stage extraction filtering module completes extraction filtering in a time-sharing multiplexing mode and outputs I/Q data with different narrow-band bandwidths; the multimode audio demodulation module adopts a time-sharing multiplexing and pipeline processing mode, and processes the audio demodulation of one monitoring channel in each clock period; the frequency spectrum calculation module is used for converting the time domain signal into the frequency domain signal to obtain power spectrum data, and the frequency spectrum calculation module completes data processing of a plurality of channels in a time division multiplexing mode. Therefore, the multi-path narrow-band signals in the intermediate frequency bandwidth can be monitored and analyzed simultaneously, and the method is flexible and practical; the resource utilization rate is greatly reduced, the number of monitoring channels is increased by approximately 5 times under the condition of using the same FPGA resource, the total bandwidth of monitoring is also increased by K (K is the number of ADCs), and each path of monitoring supports the selection of the center frequency, the demodulation bandwidth and the demodulation mode, so that the method is very flexible; the bottleneck of multi-channel monitoring engineering realization is solved, and the engineering practical value is high.
Drawings
Fig. 1 is a block diagram of a specific structure of a single radio signal monitoring device provided in the prior art.
Fig. 2 is a specific block diagram of a multi-channel radio signal monitoring device according to an embodiment of the present invention.
Fig. 3 is a block diagram of a specific architecture of a multi-channel quadrature mixing module in an embodiment of the present invention.
Fig. 4 is a specific structural block diagram of a DDC multistage decimation filter module in an embodiment of the invention.
Fig. 5 is a block diagram of a specific structure of a multi-mode audio demodulation module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Referring to fig. 2, the multi-channel radio signal monitoring apparatus provided by the embodiment of the present invention includes a multi-channel ADC module 11, an ADC channel selection module 12, a multi-channel quadrature mixing module 13, a DDC (Digital Down Converter, digital down-conversion) multi-stage decimation filter module 14, a bandwidth selection module 15, a channel arbitration module 16, and a multi-mode audio demodulation module 17, which are electrically connected in sequence, a spectrum calculation module 18 connected to an output end of the channel arbitration module 16, and an ITU parameter measurement module 19 connected to an output end of the spectrum calculation module 18, wherein an input end of the multi-channel ADC module 11 receives multi-channel intermediate frequency analog signals,
the multipath ADC module 11 is used for carrying out analog-to-digital conversion processing on multipath intermediate frequency analog signals;
the ADC channel selection module 12 is configured to select one of the ADCs for the monitoring channel according to the center frequency parameter, so as to implement monitoring center frequency selection;
the multipath orthogonal mixing module 13 is used for multipath parallel orthogonal mixing processing and corresponds to the number N of the monitoring channels;
the DDC multistage decimation filter module 14 completes decimation filtering in a time division multiplexing mode and outputs I/Q data with different narrowband bandwidths;
the bandwidth selection module 15 is configured to select a monitoring demodulation bandwidth for each monitoring channel according to the setting parameters;
the channel arbitration module 16 is used for arbitrating and selecting the data path;
the multimode audio demodulation module 17 adopts a time division multiplexing and pipeline processing mode, and processes the audio demodulation of one monitoring channel in each clock period;
the spectrum calculation module 18 is configured to convert the time domain signal into a frequency domain signal, obtain power spectrum data, and complete data processing of multiple channels by the spectrum calculation module 18 in a time-sharing multiplexing manner;
the ITU parameter measurement module 19 is configured to complete measurement of ITU parameters according to the power spectrum data, and the ITU parameter measurement module 19 completes data processing of multiple channels in a time division multiplexing manner.
In an embodiment of the present invention, in the present invention,
the multipath ADC module comprises a plurality of (for example, K) ADCs which are connected to the ADC path selection module in parallel, and the selection control is performed through the ADC path selection module.
The ADC access selection module selects one ADC from K ADCs for each monitoring channel according to the setting parameters (the setting parameters can be issued by the upper computer), and each ADC can sample the intermediate frequency of different frequency bands according to the setting parameters. For example, if the intermediate frequency bandwidth supported by a single ADC is 40MHz at maximum, the total monitoring bandwidth is monitored within a bandwidth range of 40×k MHz at maximum, and each monitoring channel can select any frequency point within the bandwidth range of 40×k MHz.
Referring to fig. 3, the multi-path quadrature mixing module may specifically include N NCO modules, and output N paths of I/Q data after completing multi-path mixing with a parallel structure.
Referring to fig. 4, the ddc multistage decimation filter module may specifically include a CIC filter bank 141, a Data ordering module 142, and a 2-fold decimation FIR half-band filter bank 143 electrically connected in sequence, where the CIC filter bank 141 includes N parallel CIC filters, and performs decimation filtering on N paths of I/Q Data after multiple orthogonal mixing, so that the sampling rate of each path of I/Q Data is rapidly reduced to 1/I (I is a decimation multiple), the decimation multiple may be determined according to the maximum sampling rate required for demodulation, and then each path of I/Q Data is input to the Data ordering module 142, which caches each path of I/Q Data, and then the I/Q Data of each channel is taken out in a time-sharing way and sent to a 2-time extraction FIR half-band filter bank 143,2-time extraction FIR half-band filter bank 143 which comprises M2-time extraction FIR half-band filters connected in series, so that a plurality of monitoring channels can multiplex the 2-time extraction FIR half-band filter banks, the M2-time extraction FIR half-band filters connected in series step by step perform 2-time extraction, the sampling rate of the output I/Q Data of each stage of half-band filter becomes 1/2 of the original one, thus obtaining M groups of I/Q Data with different narrow band bandwidths, namely Data [1] … Data [ M-1] and Data [ M ], the M groups of I/Q Data with different narrow band bandwidths are respectively connected to a bandwidth selection module, and the M groups of different narrow band bandwidths are selected by the bandwidth selection module, so that the different narrow band bandwidths required by audio demodulation can be obtained. The sampling rate of the I/Q data required by the narrow-band demodulation is gradually reduced, so that the resources used by the multistage half-band filter bank are also gradually reduced, and the resources are further saved; the scheme can be adopted to multiplex N monitoring channels at least, namely, the selectable demodulation bandwidth of each monitoring channel is M, the scheme can be completed by only one multi-channel multi-stage extraction filter bank under the condition of multiplexing N channels, the module uses multiplier resources which are about 17% of the common scheme, and LUT resources which are about 18% of the common scheme are only needed.
Assuming that the number of monitoring channels is 32, the sampling rate of the analog intermediate frequency signal is 102.4MHz, and the maximum sampling rate required by audio demodulation is 3.2MHz, the first-stage decimation of the DDC multistage decimation module can use a CIC filter bank to perform 32 times decimation, and the sampling rate is reduced to 3.2MHz. The system clock is 102.4MHz, the 2-time extraction FIR half-band filter group comprises 12 2-time extraction FIR half-band filters, 32 channel multiplexing can be completed, the table 1 is a comparison list of consumed resources of the module and a general scheme, the used register and multiplier resources are about 17% of the general scheme, and the used LUT resources are about 18% of the general scheme. The bandwidth of the output alternative demodulation I/Q data is 800Hz, 1.6kHz, 3.125kHz, 6.25kHz, 12.5kHz, 25kHz, 50kHz, 100kHz, 200kHz, 400kHz, 800kHz, 1.6MHz.
TABLE 1
The bandwidth selection module selects the required demodulation bandwidth I/Q data for the monitoring channels according to the set demodulation bandwidth parameters of each monitoring channel, the demodulation bandwidth parameters are issued by the upper computer, and a single channel can select M different demodulation bandwidth I/Q data.
The channel arbitration module arbitrates the multi-channel I/Q data output by the multiplexing DDC multi-stage extraction module. When the bandwidths selected by the monitoring channels are different, the output I/Q data of the bandwidth selection modules of the corresponding channels may be valid at the same time, the multimode audio demodulation modules are time-division multiplexed, and cannot demodulate more than one channel of monitoring channels at the same time, so that the I/Q data to be demodulated is required to be arbitrated and selected, the channel I/Q data which are valid at the same time are staggered, and the multichannel I/Q data which are valid at the same time are converted into serial I/Q data streams so as to accord with the input time sequence of the demodulation modules, and because the clock frequency of the multimode audio demodulation modules is far greater than the speed of the demodulation data, the time is enough to process after the parallel conversion into serial.
Referring to fig. 5, the multi-mode audio demodulation module includes a data sorting module 171, a channel selection judgment module 172, a demodulation mode selection module 173, and a multi-mode demodulation module 174, which are electrically connected in sequence. The data ordering module 171 mainly arbitrates the data of the N channels, polls the input, and can ensure that the data cannot be blocked or the monitoring channel with lower baseband rate is preempted; the channel selection and judgment module 172 performs channel judgment on the data input after sorting to determine which channel to demodulate; the demodulation mode selection module 173 performs demodulation mode selection on a certain input channel, and a single channel can simultaneously select different demodulation modes; the multi-mode demodulation module 174 generally occupies a large amount of resources, and solves the problem of occupying resources, and adopts a unique structure and timing design therein, specifically adopts a module time-sharing multiplexing and pipeline processing mode, and the module time-sharing multiplexing refers to time-sharing multiplexing of the demodulated universal module. For example, both AM and CW demodulation require data processing using an open IP core, and one IP core can be multiplexed when both demodulation are completed, thereby saving resources. The pipeline design ensures the speed of data processing, ensures that one period can process the demodulation of one monitoring channel, can support the demodulation modes such as AM, FM, PM, CW, SSB, DSB and the like, can select different demodulation modes and demodulation bandwidths for each monitoring channel, has no requirement on the data input sequence of each monitoring channel and the requirement on the connectivity of the demodulated data, can perform out-of-order demodulation on the monitoring channels, and can still ensure the continuity of the demodulation sound of each monitoring channel.
The multimode audio demodulation module may further include a rate conversion module 175 electrically connected to an output terminal of the multimode demodulation module 174, where the rate conversion module 175 sets different audio data code rates for the demodulated audio data according to needs, so as to complete rate conversion. For example, the audio data rate transmitted to the upper computer is required to be 25KHz, so that the demodulated audio data is subjected to rate conversion, and the rate of the demodulated data is reduced when the rate is greater than 25 KHz; the rate is increased when the rate is less than 25 KHz.
The frequency spectrum calculation module needs higher calculation amount, takes FPGA resources and processing speed into consideration, the frequency spectrum calculation module also adopts a time division multiplexing mode to process input I/Q data of each channel in a time division mode under high clock frequency, the I/Q data of a plurality of channels are input into the FFT IP core for processing in a time division mode according to a mode of storing before ordering, after the effective data storage amount reaches the set FFT point number, the I/Q data of the corresponding channel is selected according to ordering and sent into the FFT module for calculation, and the processing time requirement is as short as possible when frequency band scanning and data scanning are considered, so the FFT module also adopts a pipeline mode to improve the performance of a monitoring system.
The ITU parameter measurement module is used for measuring ITU parameters, and also adopts a time division multiplexing processing mode to time-division process the I/Q spectrum data of each channel output from the spectrum calculation module under high clock frequency, thereby saving resources. The ITU parameters may be level, xdb bandwidth, beta db bandwidth, modulation amplitude and center frequency, etc.
In the invention, as the multi-channel radio signal monitoring device comprises a DDC multi-stage extraction filtering module, a multi-mode audio demodulation module and a frequency spectrum calculation module, the DDC multi-stage extraction filtering module completes extraction filtering in a time-sharing multiplexing mode and outputs I/Q data with different narrow-band bandwidths; the multimode audio demodulation module adopts a time-sharing multiplexing and pipeline processing mode, and processes the audio demodulation of one monitoring channel in each clock period; the frequency spectrum calculation module is used for converting the time domain signal into the frequency domain signal to obtain power spectrum data, and the frequency spectrum calculation module completes data processing of a plurality of channels in a time division multiplexing mode. Therefore, the multi-path narrow-band signals in the intermediate frequency bandwidth can be monitored and analyzed simultaneously, and the method is flexible and practical; the resource utilization rate is greatly reduced, the number of monitoring channels is increased by approximately 5 times under the condition of using the same FPGA resource, the total bandwidth of monitoring is also increased by K (K is the number of ADCs), and each path of monitoring supports the selection of the center frequency, the demodulation bandwidth and the demodulation mode, so that the method is very flexible; the bottleneck of multi-channel monitoring engineering realization is solved, and the engineering practical value is high.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The multipath radio signal monitoring device is characterized by comprising a multipath ADC module, an ADC channel selection module, a multipath orthogonal mixing module, a DDC multistage extraction filtering module, a bandwidth selection module, a channel arbitration module, a multimode audio demodulation module, a spectrum calculation module connected with the output end of the channel arbitration module, and an ITU parameter measurement module connected with the output end of the spectrum calculation module, wherein the input end of the multipath ADC module receives multipath intermediate frequency analog signals,
the multi-channel ADC module is used for carrying out analog-to-digital conversion processing on the multi-channel intermediate frequency analog signals;
the ADC channel selection module is used for selecting one ADC for the monitoring channel according to the central frequency parameter so as to realize the monitoring central frequency selection;
the multipath orthogonal mixing module is used for multipath parallel orthogonal mixing processing and corresponds to the number of the monitoring channels;
the DDC multistage decimation filter module completes decimation filtering in a time division multiplexing mode and outputs I/Q data with different narrowband bandwidths;
the bandwidth selection module is used for selecting monitoring demodulation bandwidth for each monitoring channel according to the set parameters;
the channel arbitration module is used for arbitrating and selecting the data path;
the multimode audio demodulation module adopts a time-sharing multiplexing and pipeline processing mode, and processes the audio demodulation of one monitoring channel in each clock period;
the frequency spectrum calculation module is used for converting the time domain signals into frequency domain signals to obtain power spectrum data, and the frequency spectrum calculation module completes data processing of a plurality of channels in a time division multiplexing mode;
the ITU parameter measurement module is used for completing measurement of ITU parameters according to the power spectrum data, and completing data processing of a plurality of channels by adopting a time division multiplexing mode;
the channel arbitration module performs arbitration selection on I/Q data to be demodulated, staggers channel I/Q data which are effective at the same time, and converts multi-channel I/Q data which are effective at the same time and parallel into serial I/Q data streams so as to accord with the input time sequence of the demodulation module;
the multi-mode audio demodulation module comprises a data ordering module, a channel selection judging module, a demodulation mode selecting module and a multi-mode demodulation module which are electrically connected in sequence; the data sorting module arbitrates the data of a plurality of channels and polls the input; the channel selection judging module judges the channels of the data input after sequencing and determines which channel is demodulated; the demodulation mode selection module performs demodulation mode selection on a certain input channel; the multimode demodulation module adopts a module time-sharing multiplexing and pipeline processing mode, and the module time-sharing multiplexing refers to the time-sharing multiplexing of the demodulated universal module;
the ITU parameters include one or any combination of level, amplitude, center frequency.
2. The apparatus of claim 1, wherein the multi-way quadrature mixing module comprises N NCO modules, and wherein the N I/Q data is output after multi-way mixing is completed using a parallel architecture.
3. The device of claim 1, wherein the DDC multistage decimation filter module specifically comprises a CIC filter bank, a data ordering module and a 2-time decimation FIR half-band filter bank which are electrically connected in sequence, the CIC filter bank comprises N parallel CIC filters, the decimation filtering of N paths of I/Q data after multi-path quadrature mixing is completed, so that the sampling rate of each path of I/Q data is rapidly reduced to 1/I, I is a decimation multiple, then each path of I/Q data is input into the data ordering module, the data ordering module buffers each path of I/Q data, then takes out the I/Q data of each path in a time-sharing manner and sends the I/Q data of each path to the 2-time decimation FIR half-band filter bank, the 2-time decimation FIR half-band filter bank comprises M2-time decimation FIR half-band filters connected in series, the M2-time decimation FIR half-band filters connected in series step by step, and then each stage half-band filter outputs I/Q data with a sampling rate of 1/2 times as original to obtain I/Q data of M sets with different narrowband bandwidths.
4. The apparatus of claim 3 wherein the decimation factor is determined based on a maximum sampling rate required for demodulation.
5. The apparatus of claim 1, wherein the multi-mode demodulation module supports AM, FM, PM, CW, SSB and DSB demodulation modes.
6. The apparatus of claim 1, wherein the multi-mode audio demodulation module further comprises a rate conversion module electrically connected to an output of the multi-mode demodulation module, the rate conversion module setting different audio data rates for the demodulated audio data as needed to accomplish rate conversion.
7. The apparatus of claim 1, wherein the spectrum calculation module processes the input I/Q data of each channel in a time-sharing manner at a high clock frequency, processes the input I/Q data of a plurality of channels in a time-sharing manner according to a first-storage-and-last-order manner, and after the effective data storage amount reaches a set FFT point number, selects the I/Q data of the corresponding channel according to the order, and sends the selected I/Q data to the FFT module for calculation, and the FFT module adopts a pipeline manner.
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| CN110535541B (en) * | 2019-08-02 | 2020-10-09 | 中电科仪器仪表(安徽)有限公司 | Multimode base station signal analysis device and method |
| CN112910475B (en) * | 2021-05-10 | 2021-07-20 | 成都瀚德科技有限公司 | Digital receiver for complex signal monitoring |
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| WO1999050954A1 (en) * | 1998-03-27 | 1999-10-07 | Ford Motor Company | Digital signal processing architecture for multi-band radio receiver |
| CN205305121U (en) * | 2015-11-27 | 2016-06-08 | 深圳市嵘兴实业发展有限公司 | Radio spectrum monitor positioning device |
| CN106972832A (en) * | 2017-02-28 | 2017-07-21 | 深圳市鼎阳科技有限公司 | It is a kind of can any multiple resampling digital down converter |
| CN207926605U (en) * | 2018-01-12 | 2018-09-28 | 深圳市嵘兴实业发展有限公司 | A kind of multi-path radio signal monitoring device |
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| CN108134638A (en) | 2018-06-08 |
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