CN109302248B - High-speed frequency band scanning method and device for radio monitoring receiver - Google Patents
High-speed frequency band scanning method and device for radio monitoring receiver Download PDFInfo
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- CN109302248B CN109302248B CN201711386587.4A CN201711386587A CN109302248B CN 109302248 B CN109302248 B CN 109302248B CN 201711386587 A CN201711386587 A CN 201711386587A CN 109302248 B CN109302248 B CN 109302248B
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Abstract
The invention belongs to the technical field of radio monitoring receivers, and particularly relates to a high-speed frequency band scanning method and device for a radio monitoring receiver, wherein the method comprises the following steps: the system comprises a radio frequency module, a baseband module and an upper computer, wherein the baseband module comprises an A/D, DDC, a filter bank, an FFT (fast Fourier transform), a data cache, a radio frequency control module, a frequency band scanning control module and a USB (universal serial bus) interface; the baseband processing part is realized in FPGA, and the upper computer control and data processing are realized in ARM. The structure and the technical scheme of the invention greatly improve the frequency band scanning speed of the radio monitoring receiver, so that the monitoring receiver can monitor the frequency hopping signal with high hopping speed. Simultaneously, the method also has the following advantages: 1) the scanning speed is high, and the high-jump signal is easy to monitor; 2) a low-speed mode is supported, and the conventional signals can be monitored under the condition of ensuring the frequency spectrum accuracy; 3) the system has simple structure, low performance requirement on software and hardware and easy realization.
Description
Technical Field
The invention relates to the technical field of radio monitoring receivers, in particular to a high-speed frequency band scanning method and device for a radio monitoring receiver.
Background
With the rapid growth of national economy and the high-speed development of information-based society, the radio industry shows explosive growth, so that the situation of tension of radio frequency resources is more severe, and higher requirements are provided for the radio monitoring and management work in China. The current radio monitoring is realized by adopting a radio monitoring station, and a radio monitoring receiver is a core device in the monitoring station;
at present, radio monitoring receivers on the market have a plurality of models and different functional performances, but the problem of slow frequency band scanning speed exists in common films; for the monitoring of common signals, the monitoring requirement can be basically met, but for the monitoring of frequency hopping signals with high change speed, the monitoring requirement can not be met far away; in view of the importance of high frequency scanning speed to the practical application of radio monitoring, it is increasingly important to increase the frequency scanning speed.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: a high-speed frequency band scanning method and its device for radio monitoring receiver with fast scanning speed, low-speed mode support and simple system structure are provided.
In order to solve the above technical problem, the technical solution adopted by the present invention is a scanning method for a high-speed frequency band scanning device of a radio monitoring receiver, comprising: the system comprises a radio frequency module, a baseband module and an upper computer, wherein the baseband module comprises an A/D (analog/digital) interface, a digital down-conversion DDC (direct digital converter), a filter bank, an FFT (fast Fourier transform), a data cache, a radio frequency control module, a frequency band scanning control module and a USB (universal serial bus) interface. The baseband processing part is realized in FPGA, and the upper computer control and data processing are realized in ARM.
The method comprises the following steps:
step 1, setting parameters, wherein the working clock of a system baseband processing module is f0The medium frequency bandwidth of the system is BW0Frequency band scanning bandwidth of BXThen the frequency band splicing times n0＝BX/BW0(ii) a Resolution bandwidth RBWIs BWThen the number of FFT points is n1＝BW0/BW(ii) a One frame of the frequency spectrum data cache is 32Kbit, the bit width of the frequency spectrum data is 32bit, and the cache splicing time of the data uploaded at one time is n2＝(32Kbit/32bit)/n1＝1024/n1；
Step 2, setting frequency band scanning parameters including the initial frequency, the end frequency and the resolution bandwidth RB of scanning on the upper computerW(ii) a The upper computer scans parameters according to the set frequency band with a medium frequency bandwidth BW0On the basis, the frequency band is automatically divided into a plurality of small frequency bands, and the number n of splicing times needed for obtaining the frequency band0(ii) a Then the upper computer sends the configured parameters to the baseband module through the USB interface;
step 3, after receiving the parameters of the upper computer, the baseband module starts a frequency band scanning control module; the frequency band scanning control module controls other modules according to the received parameters; firstly, the frequency band scanning control module judges whether scanning is finished or not, and if the scanning is finished, the frequency band scanning control module waits for the next scanning command of the upper computer; if not, configuring a radio frequency module from a low frequency band, after radio frequency hardware is stable, carrying out AD sampling on data, sending the data to a digital down-conversion DDC module for down-conversion, then carrying out FFT processing on corresponding points after filtering by a filter, then obtaining frequency spectrum data, and sending the frequency spectrum data to a cache region;
step 4, the cache region judges whether the data is fully stored or whether the scanning is finished, and if the data is fully stored or the scanning is finished, the data in the cache is uploaded to an upper computer; if not, feeding back to the frequency band scanning control module;
step 5, after receiving the feedback of the cache region, the frequency band scanning control module judges whether the scanning is finished, and if the scanning is finished, the frequency band scanning control module waits for the next command of the upper computer; if not, then configuring a radio frequency module from low to high immediately after the last configured frequency band position, after radio frequency hardware is stable, performing AD sampling on data, sending the data to a digital down-conversion DDC module for down-conversion, then performing filter filtering on the data, performing FFT processing on corresponding points, obtaining frequency spectrum data, and sending the frequency spectrum data to a cache region;
step 6, the system repeats the step 3, the step 4 and the step 5 until the upper computer issues a stop command;
and 7, splicing the received frequency spectrum data of each frequency band again by the upper computer to finally obtain complete frequency band frequency spectrum data.
Compared with the prior art, the invention has the following beneficial effects: the structure and the technical scheme of the invention greatly improve the frequency band scanning speed of the radio monitoring receiver, so that the monitoring receiver can monitor the frequency hopping signal with high hopping speed. Simultaneously, the method also has the following advantages:
1) the scanning speed is high, and the high-jump signal is easy to monitor;
2) a low-speed mode is supported, and the conventional signals can be monitored under the condition of ensuring the frequency spectrum accuracy;
3) the system has simple structure, low performance requirement on software and hardware and easy realization.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a system block diagram of a high speed band scanning device for a radio monitoring receiver according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The high-speed frequency band scanning method for the radio monitoring receiver comprises a plurality of working modes such as frequency band scanning, channel monitoring and the like, and when the radio monitoring receiver works in the frequency band scanning mode, an upper computer issues frequency, gain and resolution bandwidth RB of the frequency band scanningWEqual parameters are sent to a baseband module; in the baseband module, the frequency band scanning control module analyzes the command and controls other functional modules, so that data acquisition is carried out and the data is uploaded to an upper computer.
In order to improve the frequency band scanning speed, in the system, a frequency band splicing working mode is adopted at a radio frequency control end, namely the whole scanning frequency band is formed by splicing a plurality of small frequency bands; in the data processing part, the fast Fourier transform of configurable points is adopted, and bandwidth RB can be obtained according to different resolutionsWThe configuration is flexibly changed according to the setting requirement; when data are uploaded to an upper computer, a mode of uploading after frequency spectrum data are cached and spliced is adopted, so that the transmission efficiency is greatly improved; the whole frequency band scanning process is controlled by adopting a compact time sequence, so that the consumed time is greatly shortened.
A high-speed frequency band scanning device for a radio monitoring receiver comprises a radio frequency module, a baseband module and an upper computer, wherein the baseband module comprises an A/D (analog/digital) interface, a digital down-conversion DDC (direct digital converter), a filter bank, an FFT (fast Fourier transform), a data cache, a radio frequency control module, a frequency band scanning control module and a USB (universal serial bus) interface.
Specifically, the method comprises the following steps: resolution bandwidth RB in frequency band scanning modeWSetting 1MHz and starting frequency of 100MHz to 1100MHz (namely sweep width of 1 GHz); the intermediate frequency bandwidth of the system is 20MHz, the baseband processing working clock is 62MHz, the AD is sampled and then is subjected to DDC down-conversion, and the AD is filtered by a first-stage filter and then is subjected to FFT processing; then:
N1＝(1100MHz-100MHz)/20MHz＝50；
N2＝32MHz/1MHz＝32；
N3＝1024/N2＝32；
N4＝N1/N3≈2
note: n1 is the frequency band number of times of frequency band splicing (each frequency band scanning is formed by splicing a plurality of small frequency bands);
n2 is the number of points for FFT processing;
n3 is the number of times of cache splicing of the spectrum data (each time of spectrum uploading, formed by cache splicing of multiple times of spectrum data) for each time of uploading the spectrum data;
n4 bits of frequency band scanning times of uploading frequency spectrum data;
through actual tests, the radio frequency hardware is stable after being configured once, and the time T1 consumed by data acquisition is about 400 us; scanning once in each frequency band, configuring the radio frequency hardware to be stable, and acquiring the total time T2, T1 × N1, 400us × 50, 20 ms;
the time for uploading the baseband data is about T3 bit 1 ms; scanning once in each frequency band, and uploading data for 2ms with the total time T4 being N4 × T3;
therefore in theory the resolution bandwidth RBWWhen the frequency band is 1MHz, the time consumed for scanning 1GHz is T2+ T4 is 22 ms;
then the frequency band scanning speed V/T1 GHz/22ms 45 GHz/s;
and the actual test result is about 43 GHz/s;
the frequency band scanning speed is far higher than that of domestic products of the same type.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. A high-speed frequency band scanning method for a radio monitoring receiver comprises a scanning device, wherein the scanning device comprises a radio frequency module, a baseband module and an upper computer, wherein the baseband module comprises an A/D (analog/digital) module, a digital down-conversion DDC (direct digital control), a filter bank, an FFT (fast Fourier transform), a data cache, a radio frequency control module, a frequency band scanning control module and a USB (universal serial bus) interface;
the method is characterized in that: the method comprises the following steps:
s1), setting parameters, and setting the working clock of the system baseband processing module to be f0The medium frequency bandwidth of the system is BW0Frequency band scanning bandwidth of BXThen the frequency band splicing times n0=BX/BW0Bandwidth of resolution RBWIs BWThen the number of FFT points is n1=BW0/BWWhen one frame of the frequency spectrum data cache is 32Kbit, the bit width of the frequency spectrum data is 32bit, and the cache splicing time required for uploading data once is n2=(32Kbit/32bit)/n1=1024/n1；
S2) setting frequency band scanning parameters on the upper computer, wherein the parameters comprise the starting frequency, the ending frequency and the resolution bandwidth of scanning; the upper computer scans parameters according to the set frequency band with a medium frequency bandwidth BW0On the basis, the frequency band is automatically divided into a plurality of small frequency bands, and the number n of splicing times needed for obtaining the frequency band0(ii) a Then the upper computer sends the configured parameters to the baseband module through the USB interface;
s3) the baseband module starts a frequency band scanning control module after receiving the parameters of the upper computer; the frequency band scanning control module controls other modules according to the received parameters; firstly, the frequency band scanning control module judges whether scanning is finished or not, and if the scanning is finished, the frequency band scanning control module waits for the next scanning command of the upper computer; if not, configuring a radio frequency module from a low frequency band, after radio frequency hardware is stable, carrying out AD sampling on data, sending the data to a digital down-conversion DDC module for down-conversion, then carrying out FFT processing on corresponding points after filtering by a filter, then obtaining frequency spectrum data, and sending the frequency spectrum data to a cache region;
s4) judging whether the cache area is full or not or whether the scanning is finished or not, and uploading the data in the cache to an upper computer if the cache area is full or the scanning is finished; if not, feeding back to the frequency band scanning control module;
s5) the frequency band scanning control module judges whether the scanning is finished after receiving the feedback of the cache area, and waits for the next command of the upper computer if the scanning is finished; if not, then configuring a radio frequency module from low to high immediately after the last configured frequency band position, after radio frequency hardware is stable, performing AD sampling on data, sending the data to a digital down-conversion DDC module for down-conversion, then performing filter filtering on the data, performing FFT processing on corresponding points, obtaining frequency spectrum data, and sending the frequency spectrum data to a cache region;
s6), the system will repeat the steps S3), S4), S5) until the upper computer issues the stop command;
s7), the upper computer splices the received frequency spectrum data of each frequency band again to obtain a complete frequency band frequency spectrum data.
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| CN111277281B (en) * | 2020-02-19 | 2022-03-22 | 特金智能科技(上海)有限公司 | Receiver processing method and device based on multiple functions, electronic equipment and medium |
| CN113141217B (en) * | 2021-03-10 | 2022-11-08 | 上海大学 | Quick system of patrolling and examining of track traffic multifrequency wireless signal |
| CN114567625A (en) * | 2022-03-01 | 2022-05-31 | 上海创远仪器技术股份有限公司 | Android Http service-based radio monitoring equipment control processing system, method, device, processor and storage medium thereof |
| CN114978374B (en) * | 2022-05-18 | 2023-07-25 | 北京博识广联科技有限公司 | Railway radio monitoring system |
| CN114978373B (en) * | 2022-05-18 | 2023-07-21 | 北京博识广联科技有限公司 | Fast signal acquisition system for a radio monitoring receiver |
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Address after: Block C, No. 7, Lane 205, Gaoji Road, Songjiang District, Shanghai, 201601 Patentee after: Chuangyuan Xinke (Shanghai) Technology Co.,Ltd. Address before: 200000 building 6, No. 351, siban Road, Sijing Town, Songjiang District, Shanghai Patentee before: TRANSCOM INSTRUMENTS Co.,Ltd. |