Method and system for comprehensively testing coverage effect of terrestrial digital television signal single-frequency network

Abstract

The invention discloses a terrestrial digital television signal single frequency network coverage effect comprehensive test method and a terrestrial digital television signal single frequency network coverage effect comprehensive test system. The method comprises the following steps: carrying out fixed-point receiving test, road test and approaching test on a target area through a pre-constructed terrestrial digital television signal acquisition system; summarizing the collected test data to obtain a first test result of the single-frequency network coverage effect of the ground digital television signal in the target area; under the condition that the first test result comprises that the single-frequency network overlapping coverage interference area exists in the target area, performing shutdown joint debugging test on each to-be-tested transmitting station to obtain a second test result; and according to the first test result and the second test result, determining mutual interference stations of the single-frequency network overlapping coverage interference area and carrying out single-frequency network networking optimization. Through the combination of multiple test modes and the comprehensive analysis of the test result, the actual coverage condition of the terrestrial digital television single-frequency network can be comprehensively reflected, the single-frequency network with problems can be adjusted and optimized, and the coverage effect of the target area can be improved.

Description

Technical Field

[0001] The present application belongs to the field of digital television technology, and in particular, relates to a comprehensive testing method and system for single-frequency network coverage of terrestrial digital television signals. Background Art

[0002] At present, traditional terrestrial digital TV coverage effect tests can usually only obtain the basic coverage of terrestrial digital TV. The test items are not comprehensive and systematic; the operation steps are complicated and not standardized; the equipment used in the test is large and numerous, and is not convenient to carry; and during the coverage test, it is impossible to determine which stations have generated single-frequency network interference, and it is impossible to provide comprehensive and accurate data support for optimizing the coverage effect of the single-frequency network overlapping coverage area. Summary of the invention

[0003] The embodiments of the present application provide a comprehensive testing method and system for the single frequency network coverage effect of a terrestrial digital television signal, which is used to at least solve the problems in the related art that the test can only obtain the basic coverage of terrestrial digital television, the system is not standardized enough, and it is impossible to lock and optimize the coverage effect of stations that interfere with each other in the overlapping coverage area of ​​the single frequency network.

[0004] In a first aspect, an embodiment of the present application provides a comprehensive test method for single frequency network coverage of a terrestrial digital television signal, comprising:

[0005] The target area is subjected to fixed-point reception measurement, road test and approach test by means of a pre-built terrestrial digital television signal acquisition system, wherein the fixed-point reception measurement includes respectively collecting test data from a number of test points in the target area, the road test includes continuously collecting test data on roads in the target area, and the approach test includes respectively approaching and collecting test data from the target area to each transmitter to be tested or respectively approaching and collecting test data from each transmitter to be tested to the target area;

[0006] Summarize the test data collected through the fixed-point test, road test and proximity test, and obtain the first test result of the terrestrial digital television signal coverage effect in the target area;

[0007] When the first test result includes that the target area has a single frequency network overlapping coverage interference area, each of the transmitters to be tested is shut down for joint debugging to obtain a second test result;

[0008] According to the first test result and the second test result, mutually interfering stations in the overlapping interference area of ​​the single frequency network are determined and single frequency network networking optimization is performed.

[0009] In a second aspect, an embodiment of the present application provides a terrestrial digital television signal single frequency network coverage effect comprehensive test system, the terrestrial digital television signal single frequency network coverage effect comprehensive test system comprises a terrestrial digital television signal acquisition system and a terrestrial digital television signal single frequency network coverage effect comprehensive test device;

[0010] The terrestrial digital television signal single frequency network coverage effect comprehensive testing device comprises:

[0011] The first test module is used to perform fixed-point reception test, road test and approach test on the target area through a pre-built terrestrial digital television signal acquisition system, wherein the fixed-point reception test includes collecting test data from a plurality of test points in the target area, the road test includes continuously collecting test data on roads in the target area, and the approach test includes collecting test data from the target area to each transmitter to be tested or from each transmitter to be tested to the target area;

[0012] A summary module is used to summarize the test data collected through the fixed-point test, the road test and the proximity test, and obtain a first test result of the terrestrial digital television signal coverage effect in the target area;

[0013] A second test module is used to perform shutdown joint debugging tests on each transmitting station to be tested respectively to obtain a second test result when the first test result includes that the target area has a single frequency network overlapping coverage interference area;

[0014] The optimization module is used to determine the mutually interfering stations in the overlapping interference area of ​​the single frequency network and perform single frequency network networking optimization according to the first test result and the second test result.

[0015] The comprehensive test method and system for the single-frequency network coverage effect of terrestrial digital television signals in the embodiment of the present application utilizes the constructed terrestrial digital television signal acquisition system, and adopts a combination of multiple test methods such as fixed-point reception, road test, proximity test, and shutdown joint adjustment test. Through the comprehensive analysis of these test results, the actual coverage of the single-frequency network of terrestrial digital television can be fully reflected, and the coverage effect can be comprehensively evaluated; and for the problem area of ​​the single-frequency network coverage effect, through the coverage effect analysis, the stations that interfere with each other can be quickly locked, so as to optimize the problematic single-frequency network and improve the coverage effect of the target area; it can be seen that the comprehensive and efficient comprehensive test method for the single-frequency network coverage effect of terrestrial digital television signals can quickly and accurately grasp the coverage effect of terrestrial digital television and optimize the overall coverage effect. According to the embodiment of the present application, a set of standardized and normalized feasibility test schemes are provided to understand the coverage of terrestrial digital television, including the coverage effect of the target area, the actual coverage area of ​​the transmitter, the coverage edge, and the measurement and optimization of the overlapping coverage area of ​​the single-frequency network, and the interference troubleshooting and optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 It is a flowchart of a comprehensive test method for single frequency network coverage of terrestrial digital television signals provided in an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of the connection between various devices in a terrestrial digital television signal acquisition system for fixed-point reception and measurement provided by an embodiment of the present application;

[0019] Figure 3 It is a flowchart of the fixed-point receiving and measuring provided by the embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of the connection between various devices in the terrestrial digital television signal acquisition system applied to road testing provided by an embodiment of the present application;

[0021] Figure 5 It is a flow chart of a method for shutting down and jointly debugging each transmitter to be tested, provided in an embodiment of the present application;

[0022] Figure 6 It is a flowchart of another comprehensive test method for single frequency network coverage of terrestrial digital television signals provided in an embodiment of the present application;

[0023] Figure 7 It is a structural schematic diagram of a comprehensive test system for single frequency network coverage of terrestrial digital television signals provided in an embodiment of the present application;

[0024] Figure 8 It is a structural schematic diagram of a comprehensive test device for single frequency network coverage effect of terrestrial digital television signals provided in an embodiment of the present application;

[0025] Fig. 9 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0026] Reference numerals:

[0027] A terrestrial digital television signal single frequency network coverage effect comprehensive test system 700, a terrestrial digital television signal acquisition system 710, a terrestrial digital television signal single frequency network coverage effect comprehensive test device 720, a first test module 721, a summary module 722, a second test module 723, an optimization module 724,

[0028] Electronic device 900 , processor 901 , memory 902 , communication interface 903 , bus 910 . DETAILED DESCRIPTION

[0029] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0031] On August 30, 2006, the Standardization Administration of China promulgated the national standard for terrestrial digital television transmission with independent intellectual property rights: the standard of "Frame Structure, Channel Coding and Modulation of Digital Television Terrestrial Broadcasting Transmission System", with the standard number of GB20600-2006. On January 1, 2008, based on the terrestrial digital television technology test in Beijing, the State Administration of Radio, Film and Television formally approved the use of the national standard for terrestrial digital television transmission in Beijing for the trial broadcast of terrestrial digital television broadcasting high-definition and standard-definition services, which was officially broadcast on May 1, 2008, thus opening the prelude to the application of the national standard for terrestrial digital television transmission in my country. Since then, under the unified deployment of the State Administration of Radio, Film and Television, Beijing, Shanghai, Guangzhou, Shenzhen and other places have successively adopted the national standard for terrestrial digital television transmission to broadcast terrestrial digital television high-definition and standard-definition services.

[0032] With the rapid development of communication technology, the construction of China's radio and television 5G has been in full swing since 2019. In order to promote the construction and operation of radio and television 5G networks, my country's terrestrial digital television 700MHz frequency has been migrated. The migration work involves 6026 stations, 12,350 channels, and a budget of 1.8 billion yuan. At the beginning of 2020, the State Administration of Radio, Film and Television issued the "National Terrestrial Digital Television Broadcasting Frequency Planning". On the basis of fully considering the current status of radio and television wireless transmission coverage network, in order to maximize the exploration of radio and television wireless spectrum resources and reserve development space for the current and future radio and television integration development, the planning and allocation of single-frequency network available channels and power for terrestrial digital television broadcasting at the provincial, municipal and county levels across the country was carried out, which kicked off the construction of a new pattern of terrestrial digital television coverage in my country with single-frequency network as the main focus. On April 25, 2024, the State Administration of Radio and Television held a summary meeting on the national terrestrial digital television 700 MHz frequency migration project, marking the completion of the terrestrial digital television 700 MHz frequency migration work, and also marking that my country's terrestrial digital television coverage has fully entered a new era of single-frequency network. At the same time, it is of great significance to fully and quickly grasp the coverage of terrestrial digital television in the new frequency bands, and it has become a top priority in the field of terrestrial digital television.

[0033] At present, the traditional terrestrial digital TV coverage effect test can usually only obtain the basic coverage of terrestrial digital TV. It is not standardized and systematic, and cannot fully and accurately reflect the actual coverage of terrestrial digital TV single-frequency network, including coverage area, coverage edge area, single-frequency network overlapping area, etc. It cannot lock the stations that interfere with each other in the overlapping coverage area of ​​the single-frequency network, and cannot provide comprehensive and accurate data support for optimizing the coverage effect. In addition, the equipment used in the traditional terrestrial digital TV coverage effect test method is large in size and large in number, which is inconvenient to carry.

[0034] In order to solve the problems of the related art, the embodiments of the present application provide a method and system for comprehensive testing of single frequency network coverage of terrestrial digital television signals.

[0035] The following, in conjunction with the accompanying drawings, describes in detail the comprehensive testing method for single frequency network coverage of terrestrial digital television signals provided in the embodiment of the present application through specific embodiments and application scenarios.

[0036] Figure 1 FIG. 1 is a flow chart showing a method 100 for comprehensively testing the coverage effect of a single frequency network of a terrestrial digital television signal according to an embodiment of the present application. Figure 1 As shown, the terrestrial digital television signal single frequency network coverage effect comprehensive testing method 100 may specifically include the following steps:

[0037] S101, performing fixed-point reception measurement, road test and approach test on the target area through a pre-built terrestrial digital television signal acquisition system, wherein the fixed-point reception measurement includes respectively collecting test data from a plurality of test points in the target area, the road test includes continuously collecting test data on roads in the target area, and the approach test includes respectively approaching and collecting test data from the target area to each transmitter to be tested or respectively approaching and collecting test data from each transmitter to be tested to the target area;

[0038] S102, summarizing the test data collected through the fixed-point receiving test, the road test, and the proximity test, and obtaining a first test result of the terrestrial digital television signal coverage effect in the target area;

[0039] S103, when the first test result includes that the target area has a single frequency network overlapping coverage interference area, each of the transmitters to be tested is shut down for joint debugging to obtain a second test result;

[0040] S104: According to the first test result and the second test result, determine mutually interfering stations in the single frequency network overlapping interference area and perform single frequency network networking optimization.

[0041] Therefore, by using the constructed terrestrial digital TV signal acquisition system, a combination of fixed-point reception, road test, proximity test, and shutdown joint adjustment test is adopted. Through the comprehensive analysis of these test results, the actual coverage of the terrestrial digital TV single-frequency network can be fully reflected, and the coverage effect can be fully evaluated; and for the problem area of ​​the single-frequency network coverage effect, through the coverage effect analysis, the stations that interfere with each other can be quickly locked, so as to optimize the problematic single-frequency network and improve the coverage effect of the target area; it can be seen that the comprehensive and efficient comprehensive test method for the single-frequency network coverage effect of terrestrial digital TV signals can quickly and accurately grasp the coverage effect of terrestrial digital TV and optimize the overall coverage effect. That is, in order to understand the coverage of terrestrial digital TV, including the coverage effect of the target area, the actual coverage area of ​​the transmitter, the coverage edge, and the measurement and optimization of the overlapping coverage area of ​​the single-frequency network, interference troubleshooting and optimization, a set of standardized and normalized feasibility test plans are provided.

[0042] The specific implementation methods of the above steps are introduced below.

[0043] It should be noted that, in the embodiment of the present application, the target area is determined according to the measurement requirement information, that is, the area to be measured.

[0044] In the embodiment of the present application, the terrestrial digital television signal acquisition system includes at least: a digital television signal comprehensive tester, a radio frequency adjustable attenuator, a Beidou satellite synchronization locator, a directional antenna and a standard omnidirectional antenna.

[0045] Among them, the portable digital TV signal comprehensive tester has spectrum analysis function, and supports terrestrial digital TV signal channel analysis and demodulation function, and can measure signal level, signal-to-noise ratio, MER, BER and other indicators; the RF adjustable attenuator has 1dB attenuation capability, and the attenuation adjustment range is 0-90dB; the directional antenna supports directional reception of terrestrial digital TV program signals, with a height of 4 meters; the standard omnidirectional antenna supports mobile reception of terrestrial digital TV program signals; the Beidou satellite synchronous locator provides high-precision, high-reliability and all-weather time, longitude and latitude, altitude, travel speed and other information.

[0046] Optionally, the terrestrial digital television signal acquisition system also includes electronic equipment (such as a laptop computer) and a driving mechanism (such as a monitoring vehicle). The electronic equipment is installed with a computer program to process the test data, and can realize real-time analysis of signal coverage; the monitoring vehicle is generally selected with off-road performance, which can adapt to different terrains and environmental changes such as cities, villages, mountains, deserts, etc., and can ensure stable and safe operation under adverse weather conditions.

[0047] In some embodiments, in S101, the fixed-point test includes collecting test data from several test points in the target area; the road test includes continuously collecting test data on roads in the target area; the approach test includes collecting test data from the target area to each transmitter to be tested or from each transmitter to be tested to the target area.

[0048] Specifically, refer to Figure 2 , is a schematic diagram of the connection between the various devices in the terrestrial digital television signal acquisition system used for fixed-point reception and measurement. Figure 2 As shown, it includes a digital TV signal comprehensive tester, a radio frequency adjustable attenuator, a directional antenna and a Beidou satellite synchronous locator.

[0049] Figure 3 The figure shows the flow chart of fixed-point receiving and measuring. Figure 3 As shown, the specific implementation of fixed-point reception and measurement includes: selecting multiple test points in the target area, and the multiple test points are evenly distributed in the target measurement area, and not avoiding the area that is obviously conducive to improving or reducing the reception effect to reflect the actual reception effect unless necessary; reaching the test points in turn, recording the latitude and longitude, altitude and other geographical location information of the measurement points, and recording the geographical environment of the measurement points and other factors that may affect signal reception, such as overhead antennas, trees and billboards, etc., by taking photos, videos, notes, etc.; testing the received signal level, signal-to-noise ratio, signal margin, MER, BER and other indicator information, saving the received signal spectrum diagram, channel measurement diagram and program playback screen, and recording the test time; saving the test points and basic measurement information for basic data for subsequent comprehensive analysis. From this, proceed to the remaining test points in turn for testing.

[0050] In the specific implementation, the directional receiving antenna is raised to a height of 4 meters above the ground, and the direction is adjusted to the direction of the target transmitter. The antenna polarization mode is consistent with the transmitting antenna polarization mode; the spectrum is scanned to understand the signal frequency domain characteristics and frequency domain interference; the signal audio and video are measured to understand the subjective quality of the signal received on the spot; the signal index is measured using a terrestrial digital TV comprehensive tester, and the measurement time is kept at more than 1 minute. The average value when the signal is stable is taken. If the signal cannot be stably received, it should be adjusted and re-measured within a range of about 100 meters. The received signal level, signal-to-noise ratio, modulation error rate MER, and bit error rate BER are measured in turn. If the signal cannot be locked, the signal margin M<0 is recorded; if it can be locked, the adjustable attenuator attenuation is increased (the maximum step is not more than 1dB) until the reception fails, the initial level value L1 and the minimum receiving level value L2 are recorded, and the signal margin M=L1-L2 is calculated.

[0051] In specific implementation, the attenuator is used to test the signal margin. It quantitatively displays the signal's "safety margin" and the stability and reliability at the test point, and intuitively displays the degree of attenuation and interference that the signal can tolerate without affecting the reception quality. It is conducive to timely discovering and solving potential problems, ensuring the stable transmission and high-quality reception of radio and television signals.

[0052] In specific implementation, spectrum measurement is used to reflect the frequency domain characteristics of the signal and the interference situation. Monitoring the signal strength and spectrum occupancy around the test signal and analyzing the frequency domain characteristics of the interference source can assist in analyzing the source of interference and taking appropriate measures to eliminate the interference in a timely manner.

[0053] As an optional embodiment, when the test point is located in the overlapping coverage area of ​​the single frequency network, the signal echo information is measured. Specifically, if the receiving test point is in the overlapping coverage area of ​​the single frequency network, the signal echo needs to be measured, and the antenna direction and polarization mode are adjusted to be consistent with another target transmitter, and the aforementioned measurement operation is repeated.

[0054] It can be understood that in the overlapping coverage area of ​​the single frequency network, if the signal strengths of two or three transmitters to be tested are similar, a main signal can be received, and one or two other signals with signal strengths second only to the main signal can be received. Then, the delay difference of the echo signal can be used to verify whether the received signal corresponds to the transmitter to be tested, based on the distance between the measurement location and each transmitter and the delay setting of each transmitter. If the following formula is satisfied, the received signal corresponds to the transmitter to be tested.

[0055] △T=(S1-S2) / C;

[0056] Among them, △T represents the time delay difference of the signal reaching the receiving point; S1 and S2 represent the straight-line distance between each transmitter and the receiving point, in meters; C represents the propagation speed of electromagnetic waves, which is calculated based on the speed of light 3*108 m / s calculation.

[0057] In this way, by monitoring the signal broadcast quality at different points and measuring indicators, we can understand the coverage effect and transmission stability of terrestrial digital TV signals. At the same time, fixed-point testing of the overlapping coverage area of ​​the single-frequency network can serve as an important basis for subsequent evaluation of the single-frequency network networking situation.

[0058] Furthermore, Figure 4 The figure shows the connection diagram between the devices in the terrestrial digital television signal acquisition system used in road testing. Figure 4 As shown, it includes a digital TV signal comprehensive tester, a standard omnidirectional antenna and a Beidou satellite synchronous locator.

[0059] In some embodiments, the specific implementation method of using the terrestrial digital television signal acquisition system to conduct road testing includes: planning a test route, the route includes main roads, large parks, landmark buildings, universities, residential areas, bridges and other areas in the test area, and selecting a U-shaped, M-shaped or T-shaped route according to the topography of the test area; turning on the road test function of the digital television signal comprehensive tester, driving the monitoring vehicle at a constant speed along the planned route, and ensuring the stable operation of the test equipment during the period; observing and saving signal indicator information, and for abnormal sections of the indicator information, observing the environment and other possible influencing information in detail and archiving them in the form of taking pictures, text records, etc.; saving basic measurement information to provide basic data for subsequent comprehensive analysis.

[0060] In this way, by driving the monitoring vehicle on the test area road to continuously collect signal data, observe the signal parameters in real time, and save the entire test process, we can fully and intuitively understand the actual coverage effect of terrestrial digital TV signals in the target area. In addition, the road test method is used to extend the received test data from abstract points to the lines of the path signal and the surfaces formed by the intersection of the path planning, making the conclusion of the coverage effect more intuitive.

[0061] Furthermore, the devices used in the terrestrial digital television signal acquisition system for proximity testing and the connections between the devices can be the same as those for road testing, that is, reference can be made to Figure 4 The devices shown and their connections.

[0062] In some embodiments, the specific implementation method of using the terrestrial digital television signal acquisition system to conduct proximity testing includes: planning a test route, generally starting from the transmitter, moving at a constant speed towards the test area, and the travel distance is generally more than 10km, until the signal is lost or the overlapping signal of another transmitter becomes dominant; it is also possible to start from a weak signal area more than 20km away from the transmitter and move towards the transmitter; the forward route is kept in a straight line as much as possible; turning on the road test function of the digital television signal comprehensive tester, driving the monitoring vehicle at a constant speed along the planned route, and ensuring the stable operation of the test equipment during the period; observing and saving signal indicator information, and for abnormal sections of indicator information, observing the environment and other possible influencing information in detail and archiving them in the form of taking pictures, text records, etc.; saving basic measurement information as basic data for subsequent comprehensive analysis.

[0063] In this way, by driving the monitoring vehicle from the test area to the transmitter, or from the transmitter to the test area, and obtaining test data, we can fully understand the coverage distance, coverage effect and other information of the target transmitter. In addition, the actual coverage distance of the transmitter is tested in the proximity test mode, which directly and continuously displays the attenuation and stability of the signal during transmission, providing an important reference for determining the coverage range of the transmitter and subsequent network optimization.

[0064] Therefore, by using the constructed terrestrial digital TV signal acquisition system, test data can be obtained through a combination of multiple methods such as fixed-point reception, road testing, and proximity testing. The test data includes but is not limited to: signal indicator data, spectrum information, program transmission quality information, geographic information, environmental information, and channel measurement diagrams.

[0065] It should be understood that geographic information includes positioning data that the Beidou satellite navigation locator can provide, such as longitude, latitude, altitude, speed, and topography; environmental information includes weather, surrounding complex electromagnetic environment (high-voltage lines, substations, airports, etc.), and other factors that may affect signal reception, such as building obstructions, overhead antennas, trees, and billboards; spectrum information includes signal frequency domain interference signal conditions, which is an important basis for troubleshooting possible interference and noise, and the signal's spectrum characteristics, which are important parameters for analyzing signal frequency distribution, signal bandwidth, and modulation methods; program transmission quality information includes audio and video, that is, the sound and picture of the program, which can be judged using a 5-point system; signal indicator data includes level, signal-to-noise ratio, modulation error rate, bit error rate, signal margin, and signal echo; the channel measurement chart contains key parameters and indicator information for measuring specific channel signals, which is an important basis for analyzing signal performance and indicators.

[0066] Among them, the level is an important indicator for quantifying signal strength. The higher the level, the stronger the signal, and the unit is dBμV; the signal-to-noise ratio is the ratio of signal power to noise power, which directly reflects the signal quality, and the unit is dB; the modulation error rate is the ratio of the ideal vector amplitude to the square of the error amplitude, reflecting the degree of deviation of the actual signal from the ideal signal and the damage and degradation of the signal phase and amplitude. When the signal deteriorates, its value becomes lower, and the receiver cannot correctly demodulate the signal and cannot display the image and sound. The unit is dB; the bit error rate is an indicator to measure the accuracy of signal transmission within a specified time. The higher the bit error rate, the worse the signal quality; the signal margin is the difference between the signal level at a certain position and the minimum signal level that meets the conditions for successful reception at that position, that is, the measure of the signal strength exceeding the minimum strength required for successful reception. The larger the signal margin, the more important it is to reflect the stability and reliability of signal transmission, and the unit is dB; the echo is an important parameter for testing the networking of the single-frequency network, reflecting the signal quality and network performance in the overlapping coverage area of ​​the single-frequency network, so as to identify and locate interference conflicts and judge the networking of the single-frequency network.

[0067] Furthermore, in some optional embodiments, a comprehensive analysis is performed on the level, signal-to-noise ratio, modulation error rate, bit error rate, signal margin, program image quality, echo conditions and spectrum of the single-frequency network overlapping coverage area of ​​the fixed-point test signal to understand the scattered signal distribution and signal stability in the receiving area; a comprehensive analysis is performed on the level, modulation error rate, bit error rate and program image quality of the received signal of the road test to comprehensively display the coverage of terrestrial digital television signals in the measurement area in the form of a mesh heat map; and a segmented analysis is performed on the signal indicator data collected in the proximity test to understand the signal attenuation of the transmitter with distance and the actual coverage capability.

[0068] Next, in some embodiments, in S102, the above three aspects of data are combined, further mined and analyzed, the actual coverage range of the receiving area is determined, and the signal coverage edge area, the single frequency network overlapping coverage area and the signal interference are accurately located. In this way, by combining the fixed-point test, road test, and proximity test data with specific geographical location information and environmental information, statistics, analysis, and display are performed to obtain a preliminary conclusion of the coverage test, that is, the first test result of the terrestrial digital TV signal coverage effect in the target area. In other words, the first test result includes the signal stability of the receiving point, the coverage effect of the receiving area, the coverage range of the transmitter, the signal coverage edge area, the single frequency network overlapping coverage area, and the signal interference situation.

[0069] In specific implementation, when the audio and video of the fixed-point test, road test and proximity test are all normal, the signal indicators are all higher than the threshold value, and the signal margin of the fixed-point test is above 5dB, and there is no spectrum interference, it can be determined as a stable signal coverage area; as the receiving distance and position change, when the audio and video of the fixed-point test is normal, the audio and video of the road test and proximity test are abnormal, the signal indicators of the three fixed-point tests are all at the critical value, the signal margin of the fixed-point test is below 5dB, and there is no spectrum interference, it can be determined as a signal coverage edge area; as the receiving distance and position change, when the audio and video of the fixed-point test, road test and proximity test are all abnormal, the signal indicators of the three fixed-point tests are all below the critical value, and there is no spectrum interference, it can be determined that the signal is not covered.

[0070] In specific implementation, when the audio and video of the fixed-point test, road test, and approach test are abnormal, the signal strength in the signal index is higher than the threshold value, the carrier-to-noise ratio and other indicators are not up to standard, and interference waves appear around the frequency spectrum, it can be determined that the signal has frequency domain interference. It is necessary to analyze the source of interference based on the interference signal strength, waveform, frequency domain characteristics, occurrence time, etc., and eliminate the interference. For example, but not limited to: 5G signal interference, noise interference of audio and lighting signal equipment, etc.

[0071] During specific implementation, as the receiving and measuring distance and position change, when the audio and video of the fixed-point test are normal, and the audio and video of the road test and the approach test are abnormal, the fixed-point test signal indicators of the three are slightly higher than the critical value, the fixed-point test signal margin is below 5dB, there is no interference in the spectrum, and a strong echo signal is found in the spectrum time domain, it is necessary to verify the source of the echo based on the distance between the main transmitting and receiving station, the adjacent transmitting station, and the receiving and measuring location, the delay setting, etc. If the verification result is consistent with the transmission situation, then this area is in the overlapping coverage area of ​​the single-frequency network and the single-frequency network is successfully established; when the fixed-point test signal margin is below 5dB, there is no interference in the spectrum, and a strong echo signal is found in the spectrum time domain, it is necessary to verify the source of the echo based on the distance between the main transmitting and receiving station, the adjacent transmitting station, and the receiving and measuring location, the delay setting, etc., and the verification result is consistent with the transmission situation, then this area is in the overlapping coverage area of ​​the single-frequency network and the single-frequency network is successfully established; when the fixed-point test signal margin is below 5dB, the fixed-point test signal margin is below 5dB, and the spectrum is free of interference. Abnormal conditions occur in audio and video during point testing, road testing, and proximity testing. The signal strength in the signal indicators is higher than the threshold value, indicators such as the carrier-to-noise ratio do not meet the standards, there is no interference in the spectrum, and a strong echo signal is found in the spectrum time domain. The source of the echo needs to be verified based on the distance and delay settings of the main transmitting and receiving station, the adjacent transmitting station, and the receiving and measuring location. If the echo signal comes from the adjacent transmitting station, the area is in the overlapping coverage area of ​​the single-frequency network and the single-frequency network may not be successfully established. In this case, it will be necessary to perform network optimization through power on and off testing, adjustment of transmission parameters, and other methods.

[0072] That is to say, the echo source can be calculated based on the signal echo information, the transmission parameters of each transmitter to be tested and its distance from the test point in the target area; then, based on the echo source, it is determined whether there is a single-frequency network overlapping coverage interference area in the target area.

[0073] It should be understood that when users in the overlapping coverage area of ​​the single-frequency network receive long-delay, strong multipath signals output by long-distance transmitters, if the maximum delay time of these signals is greater than the multipath delay processing capability of the receiving equipment, such long-delay, strong multipath signals will become interference signals at this time, which will have a negative impact on the coverage and quality of the single-frequency network.

[0074] In the overlapping coverage area of ​​the single-frequency network, when the signal strength of the two transmitters is similar, the signals of the two stations can be controlled to overlap each other for better optimization. However, if there are problems with the delay or other indicators and parameter settings of the transmitter, the signals of the adjacent stations will not only fail to add to the main signal but become interference signals. As a result, although the signal strength in the overlapping coverage area of ​​the single-frequency network can reach the measurement index, the signal cannot be received. Therefore, it is necessary to lock the mutually interfering stations in the overlapping coverage area of ​​the single-frequency network.

[0075] In some embodiments, S104 can be specifically implemented through the following steps: determine a main receiving and transmitting station from multiple transmitting stations to be tested based on the first test result, the transmission parameters of each transmitting station to be tested and its distance from the target area; determine a main interference transmitting station corresponding to a main interference signal and a secondary interference transmitting station corresponding to a secondary interference signal among multiple transmitting stations to be tested except the main receiving and transmitting station based on the second test result; and adjust the transmission parameters of the main interference transmitting station and the secondary interference transmitting station respectively based on the second test result.

[0076] In specific implementation, the main receiving transmitter is determined from multiple transmitting stations to be tested based on the first test result, the transmission parameters of each transmitting station to be tested (such as transmission power) and the distance from the target area. Then, among the multiple transmitting stations to be tested, the transmitters other than the main receiving transmitter are possible interference sources of the single frequency network, and the number of interfering transmitting stations is generally 1-2.

[0077] It should be understood that, except for high-mountain stations, the normal coverage distance of stations generally does not exceed 50 kilometers. Therefore, in specific implementation, if there is indeed a problem with receiving signals in the single-frequency network coverage area, it can be basically determined that the transmitter with the closest distance or the best propagation conditions is the main receiving and transmitting station, and the interference source may come from the remaining transmitters. If there are high-mountain stations nearby, the high-mountain stations are also listed as possible interference transmitters.

[0078] In another embodiment, the specific implementation method of shutting down and jointly debugging each transmitter to be tested can be referred to in Figure 5 .like Figure 5As shown, after determining the main transmitting and receiving station and the transmitting station that may be the source of interference to the single-frequency network, contact the transmitting unit and agree on the shutdown test time with the main transmitting and receiving station and the interference transmitting station to be tested, for example, during the routine shutdown and maintenance period; in the area where the single-frequency network coverage effect is problematic, the transmitting station is turned on and off in sequence to perform joint debugging; during the shutdown joint debugging test, the area where the single-frequency network coverage effect is problematic is tested again to obtain a second test result, and the interference source is determined by changes in signal indicators.

[0079] Next, based on the second test result of the joint coverage test, the corresponding interference transmitter is guided to adjust parameters and indicators such as signal delay to optimize the single frequency network and improve the coverage effect.

[0080] Furthermore, in some embodiments, the process returns to S101, that is, the pre-built terrestrial digital television signal acquisition system performs fixed-point reception test, road test and proximity test on the target area until there is no single frequency network overlapping coverage interference area in the target area.

[0081] In summary, based on the first test result obtained from the summary, it is evaluated whether there is interference caused by the single-frequency network networking problem, and it is determined whether to perform a power-on and power-off test. If not, the process ends; if there is single-frequency network interference, a power-on and power-off test is performed. After optimization and adjustment, the overlapping coverage area of ​​the single-frequency network is retested to evaluate the coverage effect of the terrestrial digital TV signal after adjustment. It is possible to identify stations that interfere with each other, troubleshoot the cause of interference, and improve coverage. In addition, the actual measurement results of 34 provinces across the country show that this method can achieve comprehensive and efficient testing of the single-frequency network coverage effect of terrestrial digital TV signals.

[0082] Therefore, by utilizing the constructed terrestrial digital TV signal acquisition system, the signal coverage indicators of terrestrial digital TV in the target area can be obtained through a combination of multiple methods such as fixed-point reception and measurement, road testing, and proximity testing, so as to comprehensively evaluate the coverage effect and find the interference area of ​​overlapping coverage of the single-frequency network; further, for the problem areas of single-frequency network coverage, through shutdown joint debugging testing and coverage effect analysis, it is possible to quickly lock the stations that interfere with each other and find out the cause of the interference, so as to optimize the problematic single-frequency network, realize the optimization of single-frequency network networking and improve the coverage effect of the target area.

[0083] The following is an illustrative description of the comprehensive testing method 100 for the single frequency network coverage effect of a terrestrial digital television signal through a more specific embodiment.

[0084] Taking a provincial capital city as an example, the city's single-frequency network transmitter uses the DS-36 channel and transmits four central TV programs in mode 2. The provincial transmitter is responsible for the urban coverage, with an antenna height of 300 meters and a transmitter transmission power of 1KW; the adjacent county transmitter is an antenna height of 134 meters and a transmitter transmission power of 1KW. According to the simulation results, there is a single-frequency network overlapping coverage area between the two on the west side of the city, and the network can be successfully formed in the overlapping area. During the field test, it was found that the signal strength in the overlapping area was acceptable, but the carrier-to-noise ratio was low, and the program could not be successfully demodulated, and the network was unsuccessful. The echo test showed that the delay difference between the two signals received in the overlapping area was 83.2μs, which just exceeded the maximum delay of mode 2 (78.7μs). The theoretical distance difference between the two signals was calculated to be 27.8km, which is consistent with the distance difference (27.2km) from the provincial transmitter and the county transmitter to the test point.

[0085] Furthermore, we contacted the transmitter to conduct a coordinated power-on and power-off test, and found that after the county-level transmitter was turned off, the signal strength in the overlapping area remained basically unchanged, the carrier-to-noise ratio was improved, and the signal could be received normally. After consulting the information, we found that according to the planning and design, the design delay of the DS-36 channel of the county-level transmitter was 81μs. Based on the test results, it was speculated that the reason for the failure of the network was that the transmitter did not set the delay. During the on-site inspection of the transmitter, it was found that the provincial transmitter broadcast specifications, the county-level transmitter delay setting was wrong, the actual delay was set to 0μs, and the power was only turned on to 800W. Therefore, the transmitter was instructed to adjust the delay and transmission power to the design value, and the overlapping area signal was successfully locked and demodulated. The echo was tested again, and the delay corresponding to the delay difference between the two signals was received. 0.33μs, which is basically consistent with the theoretical value of 0.27μs, and the single-frequency network was successfully networked after adjustment.

[0086] It can be seen that by adjusting the delay of the transmitting station at one end to effectively change the effective area of ​​the interference zone and reduce the delay difference between the strong multipath signals of the channel impulse response as much as possible, the purpose of optimizing the network and improving the coverage effect can be achieved.

[0087] In another embodiment, reference Figure 6 , provides another comprehensive test method for the single frequency network coverage of terrestrial digital television signals. Figure 6As shown in the figure, through fixed-point reception, road test, and proximity test, the coverage indicators such as the level, BER, MER, carrier-to-noise ratio, and signal margin of terrestrial digital television in the reception area can be obtained, and the coverage effect can be evaluated in an all-round way, that is, a combination of multiple test methods such as fixed-point test, road test, and proximity test is adopted. Through comprehensive analysis of the above test results, the actual coverage of the single-frequency network of terrestrial digital television is fully reflected, and data support is provided for optimal coverage; and for the problem areas of single-frequency network coverage, through power-on and power-off test and coverage effect analysis, stations that interfere with each other can be quickly locked, so as to optimize the overall coverage effect. In order to understand the coverage of terrestrial digital television, including the coverage effect of the target area, the actual coverage area of ​​the transmitter, the coverage edge, and the measurement and optimization of the overlapping coverage area of ​​the single-frequency network, interference troubleshooting and optimization, a set of standardized and normalized feasibility test plans are provided.

[0088] Specifically, based on the terrestrial digital TV signal road test software, the test index values ​​are statistically analyzed, and the signal coverage of the terrestrial digital TV signal on the route can be intuitively displayed through a comprehensive analysis of the level, MER, BER, and program image quality; based on the Aowei map, it can display information such as terrain, landforms, and buildings, and can load the coverage data of radio and television signals to show the actual signal coverage through a map, and supports data interaction between the computer and mobile terminals, making it convenient for testers to share signal measurement data, map annotations and other information.

[0089] In this way, the combination of fixed-point testing, road testing, proximity testing, and power-on and power-off testing can show the coverage effect of the terrestrial digital TV single-frequency network in a multi-dimensional and three-dimensional manner, which can more accurately analyze the signal coverage range and quality, determine the edge area of ​​signal coverage and interference, and provide data support for network optimization and expansion, so as to achieve a comprehensive evaluation of the coverage effect of the terrestrial digital TV single-frequency network. Through power-on and power-off testing and other methods, the interference stations can be determined, the causes of interference can be checked, and the transmission parameters can be adjusted and optimized accordingly to improve the coverage effect. This is of great significance to improving the coverage quality and user experience of terrestrial digital TV signals.

[0090] Therefore, by combining multiple test methods, the coverage effect of terrestrial digital TV signals can be comprehensively and systematically evaluated, including signal stability, transmission quality, coverage, etc., to ensure the comprehensiveness and accuracy of the test results. At the same time, this method provides a set of standardized and normalized test processes and equipment requirements, making the test results comparable and repeatable.

[0091] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0092] Based on the same technical concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides a comprehensive testing system 700 for the coverage effect of a single frequency network of a terrestrial digital television signal.

[0093] like Figure 7 As shown, the terrestrial digital television signal single frequency network coverage effect comprehensive testing system 700 may include: a terrestrial digital television signal acquisition system 710 and a terrestrial digital television signal single frequency network coverage effect comprehensive testing device 720.

[0094] The terrestrial digital TV signal acquisition system 710 at least includes: a digital TV signal comprehensive tester, a radio frequency adjustable attenuator, a Beidou satellite synchronous locator, a directional antenna and a standard omnidirectional antenna.

[0095] in addition, Figure 8 The specific structure of the terrestrial digital television signal single frequency network coverage effect comprehensive testing device 720 is shown. Figure 8 As shown, the terrestrial digital television signal single frequency network coverage effect comprehensive testing device 720 includes the following modules:

[0096] The first test module 721 is used to perform fixed-point reception test, road test and approach test on the target area through a pre-built terrestrial digital television signal acquisition system, wherein the fixed-point reception test includes collecting test data from several test points in the target area, the road test includes continuously collecting test data on roads in the target area, and the approach test includes collecting test data from the target area to each transmitter to be tested or from each transmitter to be tested to the target area;

[0097] A summarizing module 722 is used to summarize the test data collected through the fixed-point test, the road test and the proximity test, and obtain a first test result of the coverage effect of the terrestrial digital television signal in the target area;

[0098] The second test module 723 is used to perform shutdown joint debugging tests on each transmitting station to be tested respectively to obtain a second test result when the first test result includes that there is a single frequency network overlapping coverage interference area in the target area;

[0099] The optimization module 724 is used to determine the mutually interfering stations in the overlapping interference area of ​​the single frequency network and perform single frequency network networking optimization according to the first test result and the second test result.

[0100] Optionally, the test data includes at least: signal indicator data, spectrum information, program transmission quality information, geographic information and environmental information.

[0101] The signal indicator data includes signal echo. The fixed-point measurement includes: measuring signal echo information when the test point is located in a single frequency network overlapping coverage area.

[0102] In some optional embodiments, the optimization module 724 is specifically used to determine a main receiving transmitter from multiple transmitters to be tested based on the first test result, the transmission parameters of each transmitter to be tested and the distance between it and the target area; determine a main interference transmitter corresponding to a main interference signal and a secondary interference transmitter corresponding to a secondary interference signal among the multiple transmitters to be tested except the main receiving transmitter according to the second test result; and adjust the transmission parameters of the main interference transmitter and the secondary interference transmitter respectively according to the second test result.

[0103] In some optional embodiments, the terrestrial digital television signal single frequency network coverage effect comprehensive testing device 720 further includes a judgment module ( Figure 8 ), which is used to calculate the echo source according to the signal echo information, the transmission parameters of each transmitter to be tested and its distance from the target area; and to determine whether there is a single frequency network overlapping coverage interference area in the target area according to the echo source.

[0104] In some optional embodiments, the terrestrial digital television signal single frequency network coverage effect comprehensive testing device 720 further includes a retest module ( Figure 8 (not shown) is used to return to the step of performing fixed-point reception measurement, road test and proximity test on the target area through the pre-built terrestrial digital television signal acquisition system after adjusting the transmission parameters of the primary interference transmitting station and the secondary interference transmitting station respectively according to the second test result, until there is no single-frequency network overlapping coverage interference area in the target area.

[0105] Therefore, all the equipment used are portable devices that can be handheld or mounted in vehicles. They are small in size, light in weight, easy to carry and operate. This allows testers to easily go to various measurement locations, including remote areas, high mountains, or hard-to-reach areas such as inside buildings. With the ability to quickly start and configure, signal measurement tasks can be completed in a short time, greatly reducing the manpower and time costs required in traditional measurement methods.

[0106] It should be noted that, for the convenience of description, the above device is described in terms of functions and is divided into various modules. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0107] The device of the above embodiment is used to implement the corresponding terrestrial digital television signal single frequency network coverage effect comprehensive testing method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be repeated here.

[0108] Based on the same technical concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides an electronic device.

[0109] Fig. 9 A more specific schematic diagram of the hardware structure of an electronic device provided by this embodiment is shown.

[0110] The electronic device 900 may include a processor 901 and a memory 902 storing computer program instructions.

[0111] Specifically, the processor 901 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0112] The memory 902 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 902 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 902 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 902 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 902 is a non-volatile solid-state memory.

[0113] In certain embodiments, the memory may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Thus, typically, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of the present application.

[0114] The processor 901 reads and executes the computer program instructions stored in the memory 902 to implement any one of the comprehensive testing methods for single frequency network coverage of terrestrial digital television signals in the above embodiments.

[0115] In some examples, the electronic device 900 may further include a communication interface 903 and a bus 910. Fig. 9 As shown, the processor 901, the memory 902, and the communication interface 903 are connected via a bus 910 and communicate with each other.

[0116] The communication interface 903 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0117] Bus 910 includes hardware, software or both, and the components of online data flow billing equipment are coupled to each other. For example, but not limitation, bus 910 may include accelerated graphics port (AGP) or other graphics bus, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransport (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 910 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the present application considers any suitable bus or interconnection.

[0118] Exemplarily, the electronic device 900 may be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA).

[0119] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0120] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0121] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0122] The above reference is according to the method of the embodiment of the present application, the flow chart of the device (system) and the computer program product and / or the block diagram described various aspects of the present application.It should be understood that each square box in the flow chart and / or the block diagram and the combination of each square box in the flow chart and / or the block diagram can be realized by computer program instructions.These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the realization of the function / action specified in one or more square boxes of the flow chart and / or the block diagram.Such a processor can be but is not limited to a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit.It can also be understood that each square box in the block diagram and / or the flow chart and the combination of the square boxes in the block diagram and / or the flow chart can also be realized by the dedicated hardware that performs the specified function or action, or can be realized by the combination of dedicated hardware and computer instructions.

[0123] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A comprehensive test method for single frequency network coverage of terrestrial digital television signals, characterized in that: include: The target area is subjected to fixed-point reception measurement, road test and approach test by means of a pre-built terrestrial digital television signal acquisition system, wherein the fixed-point reception measurement includes collecting test data from a plurality of test points in the target area, the road test includes continuously collecting test data on roads in the target area, and the approach test includes collecting test data from the target area to each transmitter to be tested or from each transmitter to be tested to the target area; Summarize the test data collected through the fixed-point test, road test and proximity test, and obtain the first test result of the terrestrial digital television signal coverage effect in the target area; When the first test result includes that the target area has a single frequency network overlapping coverage interference area, each of the transmitters to be tested is shut down for joint debugging to obtain a second test result; According to the first test result and the second test result, mutually interfering stations in the overlapping interference area of ​​the single frequency network are determined and single frequency network networking optimization is performed.

2. The method according to claim 1, characterized in that The test data at least includes: signal indicator data, spectrum information, program transmission quality information, geographic information and environmental information.

3. The method according to claim 1, characterized in that The determining, according to the first test result and the second test result, mutually interfering stations in the single frequency network overlapping interference area and performing single frequency network networking optimization includes: Determine a main transmitting and receiving station from a plurality of transmitting stations to be tested according to the first test result, the transmission parameters of each transmitting station to be tested and the distance between the transmitting station to be tested and the target area; According to the second test result, determining a primary interference transmitting station corresponding to a primary interference signal and a secondary interference transmitting station corresponding to a secondary interference signal among multiple transmitting stations to be tested except the primary transmitting and receiving station; According to the second test result, the transmission parameters of the primary interference transmission station and the secondary interference transmission station are adjusted respectively.

4. The method according to claim 2, characterized in that: The signal indicator data includes a signal echo; The fixed-point receiving and measuring includes: measuring signal echo information when the test point is located in a single frequency network overlapping coverage area.

5. The method according to claim 4, characterized in that The method further comprises: Calculate the echo source based on the signal echo information, the transmission parameters of each transmitter to be tested and its distance from the target area; According to the echo source, it is determined whether there is a single frequency network overlapping coverage interference area in the target area.

6. The method according to claim 3, characterized in that: After adjusting the transmission parameters of the primary interference transmitting station and the secondary interference transmitting station respectively according to the second test result, the method further includes: Return to the step of performing fixed-point reception test, road test and proximity test on the target area through the pre-built terrestrial digital television signal acquisition system until there is no single-frequency network overlapping coverage interference area in the target area.

7. A comprehensive test system for single frequency network coverage of terrestrial digital television signals, characterized in that: The terrestrial digital television signal single frequency network coverage effect comprehensive test system comprises a terrestrial digital television signal acquisition system and a terrestrial digital television signal single frequency network coverage effect comprehensive test device; The terrestrial digital television signal single frequency network coverage effect comprehensive testing device comprises: The first test module is used to perform fixed-point reception test, road test and approach test on the target area through a pre-built terrestrial digital television signal acquisition system, wherein the fixed-point reception test includes collecting test data from a plurality of test points in the target area, the road test includes continuously collecting test data on roads in the target area, and the approach test includes collecting test data from the target area to each transmitter to be tested or from each transmitter to be tested to the target area; A summary module is used to summarize the test data collected through the fixed-point test, the road test and the proximity test, and obtain a first test result of the terrestrial digital television signal coverage effect in the target area; A second test module is used to perform shutdown joint debugging tests on each transmitting station to be tested respectively to obtain a second test result when the first test result includes that the target area has a single frequency network overlapping coverage interference area; The optimization module is used to determine the mutually interfering stations in the overlapping interference area of ​​the single frequency network and perform single frequency network networking optimization according to the first test result and the second test result.

8. The system according to claim 7, characterized in that The terrestrial digital television signal acquisition system at least includes: a digital television signal comprehensive tester, a radio frequency adjustable attenuator, a Beidou satellite synchronous locator, a directional antenna and a standard omnidirectional antenna.

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