CN112187379A - High-reliability high-precision radio monitoring receiving system suitable for ultralow temperature environment - Google Patents
High-reliability high-precision radio monitoring receiving system suitable for ultralow temperature environment Download PDFInfo
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- CN112187379A CN112187379A CN202010982501.XA CN202010982501A CN112187379A CN 112187379 A CN112187379 A CN 112187379A CN 202010982501 A CN202010982501 A CN 202010982501A CN 112187379 A CN112187379 A CN 112187379A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides a high-reliability high-precision radio monitoring receiving system suitable for an ultralow temperature environment, and belongs to the technical field of wireless mobile communication. The invention customizes a case for a receiver working in an ultralow temperature environment, and adds a temperature sensor and a heating device in the case, wherein the temperature sensor monitors the temperature of the working environment in the case in real time, and feeds the monitored temperature back to the heating device and the receiver, the heating device adjusts the working temperature in the case according to the fed temperature, a correction register is arranged at the output end of the receiver, frequency, an amplitude deviation table and a discrete frequency mapping table are stored in the correction register, and the signals actually output by the receiver are output after amplitude and frequency compensation is carried out according to the current temperature. The system can be suitable for the environment of 30 ℃ below zero to 10 ℃ below zero, and improves the accuracy and reliability of the measurement signal through the amplitude and frequency compensation of the signal.
Description
Technical Field
The invention relates to the technical field of wireless mobile communication, in particular to a high-reliability high-precision radio monitoring receiving technology based on an ultralow temperature environment.
Background
Since the traditional radio monitoring system is mainly applied to work at normal temperature, the main working range is-5 ℃ to 40 ℃, and qualitative measurement is mainly carried out. Considering the particularity of the ultralow-temperature working environment of the winter olympics, how to measure the radio condition in the field of the winter olympics with high precision is a difficult problem at present, and the measurement is mainly reflected in three aspects: firstly, how outdoor radio monitoring equipment can normally work in a working environment of more than-30 degrees below zero; secondly, in the working process, how to ensure the accuracy of the monitored signal amplitude and improve the accuracy of interference monitoring and legal signal monitoring, so that the judgment accuracy and the positioning accuracy are improved in the subsequent interference judgment and interference positioning through the monitoring result; and thirdly, how to ensure that the frequency of the monitored object is accurate in the normal monitoring process so as to accurately judge the accurate frequency of the interference.
At present, no relevant research is available on radio monitoring receivers in low-temperature environments in China, and a main paper is the research on receiver architectures and algorithms in normal-temperature environments. For example, reference 1 (wang zhu radio test, measurement receiver type analysis [ J ] information and computer (theoretical edition), 2017,378(08):191-193.) mainly discusses the performance of different types of receivers on specific indexes, does not discuss a system in a low-temperature environment such as a winter and ao scene, and does not aim at improving the accuracy of monitoring signal amplitude and a solution for frequency accuracy in the low-temperature environment. Reference 2 (zheng billow, wang lingjing, et al. software radio receiving platform design [ J ] software based on FPGA, 2013(04):26-28.) analyzes the system architecture and system modeling of the receiver, and does not relate to the analysis of how to improve the radio security guarantee capability in a low-temperature environment. Reference 3 (chenyanping, classification analysis of electromagnetic interference on radio receivers [ J ]. chinese radio, 2012,000(006):58-58.) paper "classification analysis of electromagnetic interference on radio receivers, chinese radio" mainly analyzes the influence of different interferences on receivers, including blocking interference, co-channel interference, adjacent channel interference, and the like, and proposes a part of ideas under a complex electromagnetic environment, but does not have a solution for a low-temperature environment. At present, the conventional receiver cannot be applied to the working environment at ultralow temperature, such as the winter Olympic Commission, and cannot meet the requirement of radio safety guarantee, so that a high-reliability high-precision radio monitoring receiving system needs to be further developed.
Disclosure of Invention
Aiming at the problems that the conventional receiver can not meet the monitoring requirements under the complex electromagnetic environment under the extremely low temperature environment, namely the accuracy of the amplitude and the frequency of the monitored data can not meet the requirements of the radio safety guarantee and the like, the invention improves the conventional receiver on the basis of the conventional receiver, redesigns and optimizes and adjusts the conventional receiver in the aspects of logic and framework, and realizes the radio monitoring equipment suitable for the ultralow temperature working environment of the winter Olympic conference.
The invention provides a high-reliability high-precision radio monitoring receiving system suitable for an ultralow temperature environment, which comprises the following implementation technical means:
(1) customizing a case for the receiver, and adding a temperature sensor and heating equipment in the case;
(2) setting a linkage control strategy in the system, comprising:
(2.1) monitoring the temperature of the working environment in the case in real time by a temperature sensor, and feeding the monitored temperature back to the heating equipment and the receiver;
(2.2) the heating equipment compares the current temperature with a preset temperature range, and starts to work if the current temperature is not within the preset temperature range, so as to adjust the temperature in the chassis to be within the set range;
(2.3) setting a correction register at the output end of the receiver, and storing a frequency deviation table, an amplitude deviation table and a discrete frequency mapping table; when the receiver outputs signals, according to the temperature fed back by the temperature sensor at present, amplitude deviation and frequency deviation of different temperatures corresponding to the continuous frequency fitted by the discrete frequency mapping table, the frequency deviation table and the amplitude deviation table are combined, and the output signals are corrected and then output and displayed.
The acquisition process of the discrete frequency mapping table is as follows: extracting discrete frequencies according to the working frequency range of the receiver, taking the starting frequency of the receiver as the first extracted discrete frequency, and stopping extraction until the extracted discrete frequency is more than or equal to the ending frequency, wherein the extracted discrete frequency is the most one as the ending frequency; and recording all the extracted discrete frequencies and the continuous frequency range corresponding to each discrete frequency in the discrete frequency mapping table.
The frequency deviation table and the amplitude deviation table are obtained through pre-testing, and elements in the tables represent frequency difference values or amplitude difference values of output signals of the receiver at different working frequencies and at different temperatures.
When the receiver outputs signals, the corresponding discrete frequency is searched by the discrete frequency mapping table according to the current working frequency of the receiver, and the frequency deviation and the amplitude deviation value under the corresponding temperature and frequency are searched in the frequency deviation table and the amplitude deviation table according to the current feedback temperature of the temperature sensor, so that the signals are output after the frequency and the amplitude of the actual output signals of the receiver are compensated.
Compared with the prior art, the invention has the following advantages:
(1) the system of the invention is added with a temperature self-adaptive adjusting subsystem, which can ensure that the monitoring system can work in a proper working environment, so as to prevent the situation that the whole receiver can not work normally because the local sub-device of the receiver can not work due to too low temperature. The temperature self-adaptive adjusting subsystem used in the invention can greatly improve the working environment of the traditional receiver from minus 10 ℃ to minus 30 ℃, and greatly improves the adaptability of the winter-oriented scene.
(2) The system of the invention compensates the amplitude of the signal measured by the receiver by using amplitude deviation correction, so that the amplitude precision of the signal measured at minus 30 ℃ to minus 10 ℃ is improved from 5dB to 2dB, and the reliability and the accuracy of the measurement are greatly improved.
(3) The system of the invention uses frequency deviation correction to compensate the frequency of the signal measured by the traditional receiver, so that the frequency accuracy of the signal measured at minus 30 ℃ to minus 10 ℃ is improved from 1e-6 to 1e-7, and the test accuracy and stability are greatly improved.
Drawings
FIG. 1 is a block diagram of a precision measurement receiver for amplitude frequency optimization based on temperature adjustment according to the present invention; wherein, (a) a set of temperature sensor and air heating system is added in the radio frequency system of the conventional receiver; (b) is a schematic diagram of an intermediate frequency processing unit and a processing control unit of a receiver;
FIG. 2 is a schematic diagram of the frequency error distribution of the present invention at different frequencies and different temperatures;
FIG. 3 is a schematic diagram of the amplitude error distribution of the present invention at different frequencies and different temperatures;
FIG. 4 is a schematic diagram of the process of discrete frequency decimation according to the present invention;
FIG. 5 is a table of frequency error distributions for different frequencies and different temperatures according to the present invention;
FIG. 6 is a table of amplitude error distributions at different frequencies and different temperatures according to the present invention;
fig. 7 is a flow chart of the present invention for frequency and amplitude error correction of an output rf signal.
Detailed Description
The present invention will be described in further detail and with reference to the accompanying drawings so that those skilled in the art can understand and practice the invention.
The traditional receiver is a complete set of equipment system capable of performing radio monitoring work in a normal temperature environment. The invention improves the traditional receiver, configures a new improved case, a power supply, a temperature sensing and temperature adjusting device, an amplitude and frequency deviation rectifying system and the like, and realizes an amplitude and frequency optimization accurate measurement receiving system based on temperature adjustment through a new linkage control program so as to be suitable for use in an ultralow temperature environment.
The improvement of the invention is mainly embodied in three aspects: 1. hardware improvement, mainly customizing a case and a power supply suitable for an ultralow temperature environment, and installing a temperature sensor and an air heating system in the case; 2. establishing a compensation lookup table of signal amplitude and frequency accuracy; 3. and correcting the output result of the receiver. These three aspects are described in detail below with reference to the drawings.
As shown in fig. 1(a), the present invention adds a set of temperature control and compensation system to a conventional receiver rf system, that is, a temperature sensor and an air heating system are installed in a chassis, the temperature sensor obtains a working environment temperature, and the air heating system adjusts the working environment temperature in the chassis, so that when the receiver is in an external environment of-10 ℃ to 30 ℃, devices in the chassis of the receiver can also work. In fig. 1(a), RF in represents a radio frequency signal input port, ESD represents an electrostatic impedance device, the input radio frequency signal passes through ESD and then is input into a sub-band pre-selector, and the sub-band pre-selector performs processing such as gain control and down-conversion filtering on the radio frequency signal of a corresponding frequency band. As shown in the figure, three frequency band filters are used for outputting in-phase and quadrature (I/Q) radio frequency signals after performing gain control (attenuator processing of 0-30 db) and down-conversion filtering and LO (local oscillator) modulation on the radio frequency signals with the frequency band of 610MHz-20GHz, and directly outputting the radio frequency signals after performing gain control (gain of 30 db) on the radio frequency signals with the frequency band of 40MHz-160 MHz.
In combination with the application of an environmental temperature limit value, a case of the receiver needs to be customized and a power supply needs to be modified, and a temperature sensor and an air heating system are arranged in the customized case to keep a proper temperature, so that all components of the receiver in the case can work normally in an environment of minus 10 degrees to 30 degrees. For example, in the embodiment of the present invention, a temperature range for normal operation is set in the air heating system, for example, within 20 ℃ ± 5 ℃, and when the temperature sensor detects that the temperature in the chassis exceeds the set temperature range, the air heating system starts to operate. When the case is designed, the invention takes the placing of the power supply and the air heating device of the receiver and the power consumption into consideration, takes the structural design and the electromagnetic compatibility design between the built-in heating device and the original receiver into consideration, and carries out integral grounding and shielding on the newly-accessed heating and temperature sensing device.
However, the accuracy of the operating frequency and amplitude of the receiver cannot be guaranteed only by improving the case of the receiver and adding the temperature control and compensation system, and the heating device such as a wind heating system is gradually heated to make the temperature of the working environment appropriate, which requires a certain time, so that the accuracy of the output of the receiver needs to be guaranteed by further using an amplitude and frequency correction program.
As shown in fig. 1(b), after the received radio frequency signal is processed in (a), the receiver performs analog-to-digital conversion (ADC), and the converted digital signal is output to an fir (finite Impulse response) filter through an JED204B interface, where the filter uniquely corresponds to the local oscillator, that is, the digital signal enters a fixed local oscillator frequency for frequency mixing. Then, the sampling rate of 250MSPS is used for down-sampling, and then the down-sampling is carried out in a buffer such as fast scanning, real-time spectrum or IQ acquisition according to different applications.
In the range of-30 c to-10 c, the output of the receiver is frequency and amplitude error, as shown in fig. 2 and 3. Therefore, before the new device is put into use, the test frequency is selected by using the test frequency selection program according to the frequency range (lowest frequency and highest frequency) of the receiver, and the amplitude and frequency deviation values of the receiver at different temperatures and different test frequencies are obtained through experiments.
As shown in fig. 4, when performing frequency extraction, the operating frequency range of the receiver is obtained first, then the starting frequency is used as the first extracted test frequency, the extracted ith test frequency is the (i-1) th test frequency extraction coefficient, and the extraction is stopped until the extracted test frequency is greater than or equal to the end frequency, and the most extracted test frequency is the end frequency. The decimation factor is generally set in a range of more than 1 and less than 3, and for example, in the procedure implemented below, the decimation factor is set to 1.5. Too small an extraction coefficient can result in too large an amount of calculation, resulting in poor practical application experience. Too large a decimation factor setting may result in insufficient accuracy. Therefore, the decimation factor needs to be set appropriately.
The frequency selection program realized based on matlab in the embodiment of the invention is as follows:
in the above procedure, the initial value of the intermediate frequency freq _ temp is set to fsatr, the decimation factor is set to 1.5, and the frequency decimated by 1.5 × intermediate frequency is stored in the discrete frequency list freq _ list until the frequency is decimated to the termination frequency fstop.
And generating a discrete frequency mapping table by the extracted discrete frequency, and recording the corresponding relation between the extracted discrete operating frequency and the corresponding continuous operating frequency in the discrete frequency mapping table. Continuous frequency ranges corresponding to adjacent discrete frequencies can overlap, and when the actually obtained frequency is located in the overlapping frequency range of two discrete frequencies, the actual frequency is mapped to the discrete frequency closest to the frequency.
After obtaining the discrete test frequency, in the embodiment of the present invention, the frequency value and the amplitude value of the output signal of the receiver at different test frequencies are recorded in a constant temperature environment of 20 ℃, then accurate measurement of the amplitude and the frequency of the output signal of the receiver at different frequencies is performed every 2 ℃ within a temperature range from-30 ℃ to-10 ℃, and the test result is recorded. The frequency and amplitude values of the radio frequency signals output by the receiver at different frequencies at different temperatures are respectively subtracted from the frequency and amplitude values of the signals output by the receiver at different frequencies at normal operating temperatures, such as at a constant temperature of 20 ℃, so as to obtain two-dimensional deviation values of the frequency and the amplitude, wherein the units are dB and Hz, and a compensation query table is generated. The compensation lookup table includes a table of frequency deviation at different temperatures and different frequencies as shown in fig. 5, and a table of amplitude deviation at different temperatures and different frequencies as shown in fig. 6.
As shown in fig. 5 and 6, the columns of the frequency deviation table and the amplitude deviation table represent different temperatures and the rows represent different operating frequencies of the receiver. The element in the ith row and jth column of the frequency deviation table or amplitude deviation table represents the frequency difference or amplitude difference between the output signal of the receiver at the ith frequency and the normal operating temperature at the jth temperature. The obtained compensation look-up table is stored in a correction register at the output of the receiver.
The integral deviation rectifying work of the receiver system of the invention can be realized by a linkage control program, which mainly comprises the following steps: temperature real-time monitoring and feedback, working environment temperature control, and elimination of frequency error and amplitude error of output signals. The real-time temperature monitoring and feedback are realized by using a temperature sensor. The working environment temperature control is that the heating equipment is adjusted and controlled according to the sensed temperature. The elimination of the frequency error and the amplitude error of the output signal refers to that in the actual use process, in a correction register in fig. 1(b) of the receiver, according to the temperature monitored by the temperature sensor, the amplitude and frequency deviation rectification program is utilized, and based on a two-dimensional deviation table and a discrete frequency mapping table of the amplitude and the frequency, the amplitude and the frequency accuracy of the signal output by the receiver are calibrated, so that the high-reliability and high-precision radio monitoring and receiving are realized.
As shown in fig. 7, when the frequency and amplitude error correction is performed, the compensation look-up table is read first. And then obtaining the temperature of the current working environment in the receiver case through a temperature sensor, comparing the temperature with the temperature monitored last time, if the difference is more than 1 degree, correcting the frequency and amplitude deviation, otherwise, correcting the frequency and amplitude deviation is not needed.
The main program of the frequency error and amplitude error correction algorithm based on matlab in the embodiment of the invention is as follows:
Clear
Clear all；
[ fmin fmax ] ═ Getfrequency (); the frequency range of the receiver is obtained, and fmin and fmax are respectively the minimum value and the maximum value of the obtained frequency range;
temperature ═ Gettemp (); // Gettemp () means getting the temperature from the temperature sensor;
if abs (temperature-temperature) >1// temperature refers to the temperature last obtained from the temperature sensor, abs () is the absolute value;
load errortable (fmin, fmax, tempmin, tempmax); the// error table is a compensation lookup table, and tempmin and tempmax refer to the lowest temperature and the highest temperature of the receiver;
point ═ pointread (); reading the number of points of the frequency spectrum displayed by the current receiver;
[ original _ freq _ list, original _ amp _ list ] ═ spectrumread (); reading the frequency spectrum actually fed back by the receiver, and acquiring an original frequency list origin _ freq _ list and an original amplitude list origin _ amp _ list fed back by the receiver;
calculate _ freq _ error _ list ═ calculate _ freq _ error (freq _ start, freq _ stop, point); calculating a frequency error value according to the starting frequency termination frequency and the frequency point number and storing the frequency error value in a frequency error list variable;
real _ freq _ list ═ calculated _ freq _ error _ list + original _ freq _ list; obtaining a real frequency value real _ freq to be displayed finally according to the frequency error calculated in the previous step and the original frequency;
calculate _ entropy _ error _ list ═ calculate _ entropy _ error (real _ freq _ list); calculating the amplitude error on the corresponding frequency according to the real frequency value calculated in the previous step, and storing the amplitude error value in an amplitude error list variable;
real _ argument _ list ═ calculate _ argument _ error _ list + original _ amp _ list; obtaining a real amplitude value real _ amplitude on a corresponding frequency to be displayed finally according to the amplitude error and the original amplitude calculated in the previous step;
else；
end
the above procedure realizes frequency and amplitude compensation of the signal actually output by the receiver by using the frequency deviation table and the amplitude deviation table.
The invention is suitable for the high-reliability high-precision radio monitoring receiving system in the ultralow temperature environment, and the implementation method comprises the following steps:
and 7, outputting a corresponding frequency deviation correction value and amplitude deviation correction value to the full-band frequency at any temperature according to the amplitude and frequency deviation correction method.
And 8, outputting the frequency spectrum signal with high precision amplitude and frequency.
The receiver after the improvement and optimization of the invention can work at least in the outdoor environment of minus 30 ℃ to 40 ℃, thus greatly improving the application range of the receiver.
The above-mentioned embodiments are merely for better illustrating the objects, principles, technical solutions and advantages of the present invention. It should be understood that the above-mentioned embodiments are only exemplary of the present invention, and are not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A high-reliability high-precision radio monitoring receiving system suitable for an ultralow temperature environment is characterized by comprising:
(1) customizing a case for the receiver, and adding a temperature sensor and heating equipment in the case;
(2) the temperature sensor monitors the temperature of the working environment in the case in real time and feeds the monitored temperature back to the heating equipment and the receiver;
(3) the heating equipment compares the current temperature with a preset temperature range, and starts working if the current temperature is not within the preset temperature range, so as to adjust the temperature in the machine box to be within the set range;
(4) setting a correction register at the output end of the receiver, and storing a frequency deviation table, an amplitude deviation table and a discrete frequency mapping table; the discrete frequency mapping table extracts discrete frequencies according to the working frequency range of the receiver and records the discrete frequencies and the corresponding continuous frequency range; the elements in the frequency deviation table or the amplitude deviation table represent the frequency difference or the amplitude difference of the output signals of the receiver at different working frequencies and at different temperatures under the normal working temperature;
(5) when the receiver outputs signals, the corresponding discrete frequency is searched by the discrete frequency mapping table according to the current working frequency of the receiver, and the frequency deviation and the amplitude deviation value under the corresponding temperature and frequency are searched in the frequency deviation table and the amplitude deviation table according to the current feedback temperature of the temperature sensor, so that the signals are output after the frequency and the amplitude of the actual output signals of the receiver are compensated.
2. The system of claim 1, wherein the heating device is configured to have a predetermined temperature range of 20 ℃ ± 5 ℃.
3. The system according to claim 1, wherein said discrete frequency map is obtained by: extracting discrete frequencies according to the working frequency range of the receiver, taking the starting frequency of the receiver as the first extracted discrete frequency, and stopping extraction until the extracted discrete frequency is more than or equal to the ending frequency, wherein the extracted discrete frequency is the most one as the ending frequency; and recording all the extracted discrete frequencies and the continuous frequency range corresponding to each discrete frequency in the discrete frequency mapping table.
4. The system of claim 1, wherein the frequency deviation table and the amplitude deviation table are obtained by: testing and recording frequency values and amplitude values of output signals of the receiver under different working frequencies at normal working temperature; measuring the amplitude and frequency of the output signal of the receiver under different working frequencies every 2 ℃ within the temperature range of minus 30 ℃ to minus 10 ℃; and respectively subtracting the frequency and amplitude values of the output signals of the receiver at different working frequencies at different temperatures from the frequency and amplitude values of the output signals of the receiver at different working frequencies at normal working temperature to obtain a frequency deviation table and an amplitude deviation table.
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