Small portable navigation signal comprehensive detection system and method

Abstract

The invention relates to the technical field of navigation signal detection, and discloses a small portable navigation signal comprehensive detection system and method.The system comprises a building block type mobile antenna support, backpack type comprehensive detection equipment and a navigation equipment site evaluation system, the system is composed of a backpack type comprehensive detection host and an individual soldier handheld terminal, and rapid opening and comprehensive detection of navigation signals are achieved. The backpack comprehensive detection host integrates a battery, a power supply module, a high-performance signal processing board, a radio frequency channel and a medium-wave active antenna, adopts a high-performance battery and power supply management scheme and an advanced AC7Z020 core board for signal processing, and ensures high-precision and high-sensitivity detection. The system is further integrated with an electronic compass module to achieve a direction finding function, real-time data feedback and evaluation are achieved through Bluetooth communication between the individual soldier handheld terminal and the host, the detection convenience and reliability are greatly improved, and the system is particularly suitable for scenes such as field environments, emergency rescue and military actions.

Description

Technical Field

[0001] The invention relates to the technical field of navigation signal detection, and in particular to a small portable navigation signal comprehensive detection system and method. Background Art

[0002] With the rapid development and widespread application of navigation technology, comprehensive detection of navigation signals has become particularly important. Traditional navigation signal detection systems often have problems such as large size, complex operation, inconvenient portability, and low detection efficiency, which makes it difficult to meet modern fast, efficient, and flexible detection needs. Especially in outdoor environments, emergency rescue, military operations and other scenarios, traditional detection systems are even more incapable.

[0003] Traditional navigation signal detection equipment usually requires a lot of equipment support, including complex antenna systems, bulky detection hosts and cumbersome connection lines, which not only increases the difficulty of use, but also limits the flexibility and portability of detection. At the same time, these devices also have shortcomings in energy consumption management, often requiring a lot of power support, and the battery life is limited, which brings great inconvenience to long-term and continuous detection work.

[0004] In addition, traditional detection systems also have limitations in signal processing capabilities. Due to the limited performance of the signal processing chip used, the speed and accuracy of signal processing are affected to a certain extent, making it difficult to meet the needs of high-precision and high-sensitivity detection. At the same time, traditional detection systems often lack real-time data feedback and evaluation mechanisms, which greatly reduces the accuracy and reliability of detection results. Summary of the invention

[0005] The object of the present invention is to provide a small portable navigation signal comprehensive detection system and method to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a small portable navigation signal comprehensive detection system, the system comprising a building block type mobile antenna bracket, a backpack comprehensive detection device and a navigation device site assessment system, the backpack comprehensive detection device further comprising a backpack comprehensive detection host and a single-soldier handheld terminal, for realizing rapid opening and comprehensive detection of navigation signals; The backpack integrated detection host comprises a battery, a power module, a signal processing board, a radio frequency channel and a medium wave active antenna, wherein the battery is a Jiahang polymer lithium-ion battery with a nominal voltage of 24V and a capacity of 3000mAh, and the power module divides the power supply into three paths of +12V, -12V and +15V, which are respectively supplied to the signal processing board, the radio frequency channel and the medium wave active antenna; The signal processing board adopts the AC7Z020 core board, which contains two DDR3 memory chips to form a 32-bit data bus, with a working clock frequency of 533 MHz, and the signal processing board is integrated with an electronic compass module for direction finding.

[0007] Preferably, the radio frequency channel includes MF and UHF transceiver links, the MF receiving channel receiving sensitivity is ≤-75dBm, and the UHF receiving channel receiving sensitivity is ≤-85dBm, and both have a signal self-checking function.

[0008] Preferably, the individual soldier handheld terminal communicates with the backpack comprehensive detection host via Bluetooth.

[0009] Preferably, the single-soldier handheld terminal includes system software, which includes a user interaction interface, a service layer and a data processing layer. The user interaction interface includes five active interfaces: TACAN parameter display, medium wave parameter display, navigation parameter display, system parameter setting and test report generation. The service layer is used for data transmission between the data processing layer and the user interaction interface. The data processing layer is used for smoothing, filtering and solving the signal, and storing the processed data in the SQLlite database.

[0010] Preferably, a signal comprehensive detection method applied to the above navigation signal comprehensive detection system comprises: Step 1: Use backpack integrated detection equipment to receive medium wave navigation signals and short-range navigation ranging and direction finding signals; Step 2: Preprocess the received signal, including amplification, filtering and analog-to-digital conversion; Step 3: Use the envelope detection algorithm to process the medium wave navigation signal and extract the amplitude change information of the signal. The envelope detection algorithm formula is:

[0011] in, is the input signal, is the output envelope signal; Step 4: Perform intermediate frequency demodulation on the signal after envelope detection, and pass the demodulated signal through a bandpass filter with a center frequency of 90 Hz; Step 5: Perform phase detection processing to obtain the phase information of the signal. The phase detection algorithm formula is:

[0012] in, and are the real and imaginary parts of the signal respectively; Step 6: low-pass filter the phase information to smooth the filtered phase data; Step 7: Use the inverse tangent function to process the filtered phase data to obtain the relative azimuth information. The inverse tangent formula is: ; Where x and y are the processed signal components respectively; Step 8: Demodulate the short-range navigation ranging and direction finding signal at an intermediate frequency, and perform Gaussian pulse pair recognition and decoding processing on the demodulated signal; Step 9: Perform 15Hz and 135Hz envelope detection processing on the decoded signal to obtain the main and auxiliary reference signals; Step 10: Perform coarse azimuth measurement, precise azimuth measurement and distance measurement based on the primary and secondary reference signals, and finally output the comprehensive detection result of the navigation signal.

[0013] Preferably, in the inverse tangent function processing, a result of the inverse tangent function is linearized to improve the accuracy of azimuth angle measurement.

[0014] Preferably, in the Gaussian pulse pair identification and decoding process, a matched filtering algorithm is used to extract pulse pairs from the signal, and the matched filtering formula is:

[0015] in, is the input signal, is the matched filter impulse response.

[0016] Preferably, the coarse azimuth measurement adopts a phase difference method to calculate the azimuth angle according to the phase difference between two different receiving antennas.

[0017] Preferably, the azimuth precision measurement adopts an interferometer method to calculate the precise azimuth angle through the phase difference of multiple receiving antennas.

[0018] Preferably, the distance measurement process adopts a time difference method to calculate the distance information according to the time difference between signal transmission and reception. The time difference ranging formula is: ;in, is the speed of light, is the time difference between signal transmission and reception.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This system uses a modular mobile antenna bracket and a backpack integrated detection device to greatly reduce the volume and weight of the system, making the entire system light and easy to carry, especially suitable for outdoor environments, emergency rescue, military operations and other scenarios that require rapid deployment and flexible movement. This design not only reduces the difficulty of use, but also greatly improves the flexibility and portability of detection.

[0020] Efficient energy management: The backpack comprehensive detection host has a built-in 24V nominal voltage, 3000mAh capacity Jiahang polymer lithium-ion battery, and the power module accurately divides the power supply into three paths: +12V, -12V and +15V, which are respectively supplied to the signal processing board, RF channel and medium wave active antenna, achieving efficient energy management. This not only extends the battery life, but also ensures that long-term and continuous detection work can be carried out smoothly without frequent battery replacement or charging, greatly improving the detection efficiency.

[0021] Powerful signal processing capability: The system uses the AC7Z020 core board as the core of the signal processing board. The core board is equipped with two DDR3 memory chips to form a 32-bit data bus. The working clock frequency is as high as 533MHz, which provides powerful computing power and storage support for signal processing. At the same time, the signal processing board also integrates an electronic compass module to achieve accurate direction finding. These designs enable the system to process navigation signals quickly and accurately to meet the detection requirements of high precision and high sensitivity.

[0022] Real-time data feedback and evaluation: The RF channel includes MF and UHF transceiver links, which have extremely high receiving sensitivity and are equipped with signal self-checking function, ensuring the accuracy and reliability of the test results. At the same time, the single-soldier handheld terminal communicates with the backpack integrated detection host via Bluetooth, so that the test data can be transmitted to the handheld terminal in real time, providing operators with instant data feedback and evaluation mechanism, which helps to find problems in time and take corresponding measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a working principle diagram of a small portable navigation signal comprehensive detection system according to the present invention; Figure 2 The present invention provides a flowchart of a small portable navigation signal comprehensive detection method. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-2The present invention provides a small portable navigation signal comprehensive detection system, which specifically includes a building block mobile antenna bracket, a backpack comprehensive detection device and a navigation device site assessment system. Among them, the backpack comprehensive detection device is the core part of the system, and further includes a backpack comprehensive detection host and a single-soldier handheld terminal, which work together to achieve rapid opening and comprehensive detection of navigation signals.

[0026] Backpack comprehensive detection host: The backpack integrated detection host integrates key components such as batteries, power modules, signal processing boards, RF channels and medium wave active antennas. The battery uses a 24V nominal voltage, 3000mAh capacity Jiahang polymer lithium-ion battery, which has high energy density and long endurance, ensuring the stable operation of the equipment during long-term, continuous detection work. The power module converts the power output of the battery into three voltages of +12V, -12V and +15V, which are respectively supplied to the signal processing board, RF channel and medium wave active antenna to meet the power supply needs of each component.

[0027] The signal processing board is the core part of the host. It uses the AC7Z020 core board. The core board has two DDR3 memory chips built in, forming a 32-bit data bus, and the working clock frequency is as high as 533MHz, ensuring high-speed and efficient signal processing capabilities. In addition, the signal processing board also integrates an electronic compass module for real-time measurement and provision of navigation signal azimuth information, enhancing the system's direction-finding function.

[0028] The RF channel includes MF (medium frequency) and UHF (ultra-high frequency) transceiver links, which are responsible for receiving and sending navigation signals in different frequency bands. The receiving sensitivity of the MF receiving channel reaches -75dBm, and the receiving sensitivity of the UHF receiving channel reaches -85dBm. Both have signal self-checking function to ensure the accuracy and reliability of the received signal.

[0029] Individual handheld terminal: The single-soldier handheld terminal communicates with the backpack integrated detection host via Bluetooth to achieve real-time data transmission and interaction. The handheld terminal has built-in system software, including three main parts: user interaction interface, service layer and data processing layer.

[0030] The user interface is a direct window for users to interact with the system, including five active interfaces: TACAN parameter display, medium wave parameter display, navigation parameter display, system parameter setting and test report generation. Users can intuitively view various test parameters, perform system settings and generate detailed test reports through these interfaces.

[0031] The service layer is responsible for data transmission between the data processing layer and the user interface. It receives data from the data processing layer and converts it into a format that the user interface can understand and display; at the same time, it also receives instructions entered by the user through the interface and passes them to the data processing layer for execution.

[0032] The data processing layer is the core processing part of the handheld terminal, which is responsible for smoothing and filtering the received signals and solving the calculations to improve the accuracy and reliability of the data. The processed data is stored in the SQLlite database for subsequent query and analysis by users.

[0033] Building block mobile antenna bracket: The modular mobile antenna bracket adopts a modular design and can be flexibly assembled and disassembled according to actual needs. The bracket structure is stable and can support components such as medium-wave active antennas to work stably in various environments. At the same time, the portable design of the bracket makes the entire system easy to carry and move, meeting the use needs in field environments, emergency rescue, military operations and other scenarios.

[0034] Navigation Equipment Site Assessment System: The navigation equipment site evaluation system is an auxiliary system built on the above-mentioned backpack integrated detection equipment and individual handheld terminals. It uses the navigation signal data collected by the detection equipment and combines it with advanced technologies such as the Geographic Information System (GIS) to evaluate and optimize the site selection of the navigation equipment. Through the analysis of the evaluation system, the best site location can be found to improve the coverage and transmission quality of the navigation signal.

[0035] The small portable navigation signal comprehensive detection system provided by the present invention has the characteristics of small size, light weight, convenient carrying, simple operation, high detection efficiency, low energy consumption and strong signal processing capability. At the same time, the system also has a real-time data feedback and evaluation mechanism to ensure the accuracy and reliability of the detection results. The system is suitable for navigation signal detection work in various complex environments, and provides strong support for the development and application of navigation technology.

[0036] The present invention provides a signal comprehensive detection method for a navigation signal comprehensive detection system, which can efficiently and accurately complete the comprehensive detection of medium wave navigation signals and short-range navigation ranging and direction finding signals. The implementation of the present invention will be described in detail below with reference to specific examples. Specifically, it includes the following steps: Step 1: Signal Reception Use backpack integrated detection equipment to receive medium wave navigation signals and short-range navigation ranging and direction finding signals. The backpack integrated detection equipment integrates high-performance receiving antennas and RF channels to ensure stable signal reception and high-quality transmission.

[0037] Step 2: Signal preprocessing The received signal is pre-processed, including amplification, filtering and analog-to-digital conversion. The amplification circuit is used to enhance the amplitude of the signal so that it meets the requirements of the subsequent processing circuit; the filtering circuit is used to remove noise and interference in the signal and improve the quality of the signal; the analog-to-digital conversion circuit converts the analog signal into a digital signal for subsequent digital signal processing.

[0038] Step 3: Medium wave navigation signal processing The envelope detection algorithm is used to process the medium wave navigation signal and extract the amplitude change information of the signal. The envelope detection algorithm formula is:

[0039] in, is the input signal, To output the envelope signal. Through this algorithm, the envelope information of the medium wave navigation signal can be accurately obtained, laying the foundation for subsequent demodulation processing.

[0040] Step 4: IF demodulation and filtering The signal after envelope detection is demodulated at intermediate frequency, and the demodulated signal is filtered through a bandpass filter. The center frequency of the filter is set to 90Hz to remove other frequency components generated during the demodulation process and retain useful signal components.

[0041] Step 5: Phase detection processing Perform phase detection processing to obtain the phase information of the signal. The phase detection algorithm formula is:

[0042] in, and are the real and imaginary parts of the signal respectively. Through this algorithm, the phase information of the signal can be accurately obtained, providing data support for the subsequent azimuth calculation.

[0043] Step 6: Phase Information Filtering The phase information is low-pass filtered to smooth the filtered phase data. This step can remove high-frequency noise and interference in the phase information and improve the accuracy and stability of the phase data.

[0044] Step 7: Azimuth Calculation The inverse tangent function is used to process the filtered phase data to obtain the relative azimuth information. The inverse tangent formula is: ; where x and y are the processed signal components. In order to improve the accuracy of azimuth measurement, the result of the inverse tangent function is linearized to eliminate nonlinear errors.

[0045] Step 8: Short-range navigation ranging and direction finding signal processing The short-range navigation ranging and direction finding signal is demodulated at intermediate frequency, and the demodulated signal is subjected to Gaussian pulse pair recognition and decoding. The matched filter algorithm is used to extract the pulse pair of the signal, and the matched filter formula is:

[0046] in, is the input signal, is the impulse response of the matched filter. Through matched filtering, the Gaussian pulse pairs in the signal can be accurately identified and extracted.

[0047] Step 9: Obtaining the primary and secondary reference signals The decoded signal is processed by 15Hz and 135Hz envelope detection to obtain the main and auxiliary reference signals. These two signals are the key to the subsequent rough azimuth measurement, precise azimuth measurement and distance measurement.

[0048] Step 10: Comprehensive testing and result output The coarse azimuth measurement, precise azimuth measurement and ranging processing are performed based on the primary and secondary reference signals. The coarse azimuth measurement uses the phase difference method to calculate the azimuth angle based on the phase difference between two different receiving antennas; the precise azimuth measurement uses the interferometer method to calculate the precise azimuth angle through the phase difference between multiple receiving antennas; the ranging processing uses the time difference method to calculate the distance information based on the time difference between signal transmission and reception. The time difference ranging formula is: ;in, is the speed of light, is the time difference between signal transmission and reception. Finally, the processing results are integrated and the comprehensive detection results of the navigation signal are output.

[0049] The signal comprehensive detection method of the navigation signal comprehensive detection system provided by the present invention has the advantages of high efficiency, accuracy, stability, etc., can be widely used in various navigation signal detection scenarios, and provides strong support for the development and application of navigation technology.

[0050] 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.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small portable navigation signal comprehensive detection system, characterized in that: The system includes a modular mobile antenna bracket, a backpack comprehensive detection device and a navigation equipment site assessment system. The backpack comprehensive detection device further includes a backpack comprehensive detection host and a single-soldier handheld terminal, which are used to realize the rapid opening and comprehensive detection of navigation signals; The backpack integrated detection host comprises a battery, a power module, a signal processing board, a radio frequency channel and a medium wave active antenna, wherein the battery is a Jiahang polymer lithium-ion battery with a nominal voltage of 24V and a capacity of 3000mAh, and the power module divides the power supply into three paths of +12V, -12V and +15V, which are respectively supplied to the signal processing board, the radio frequency channel and the medium wave active antenna; The signal processing board adopts the AC7Z020 core board, which contains two DDR3 memory chips to form a 32-bit data bus, with a working clock frequency of 533 MHz, and the signal processing board is integrated with an electronic compass module for direction finding.

2. A small portable navigation signal comprehensive detection system according to claim 1, characterized in that: The radio frequency channel includes MF and UHF transceiver links, the MF receiving channel receiving sensitivity is ≤-75dBm, and the UHF receiving channel receiving sensitivity is ≤-85dBm, and both have a signal self-detection function.

3. A small portable navigation signal comprehensive detection system according to claim 2, characterized in that: The individual soldier handheld terminal communicates with the backpack comprehensive detection host via Bluetooth.

4. A small portable navigation signal comprehensive detection system according to claim 3, characterized in that: The single-soldier handheld terminal includes system software, which includes a user interaction interface, a service layer and a data processing layer. The user interaction interface includes five activity interfaces: TACAN parameter display, medium wave parameter display, navigation parameter display, system parameter setting and test report generation. The service layer is used for data transmission between the data processing layer and the user interaction interface. The data processing layer is used for smoothing, filtering and solving the signal, and storing the processed data in the SQLlite database.

5. A signal comprehensive detection method applied to the navigation signal comprehensive detection system according to any one of claims 1 to 4, characterized in that: The method comprises: Step 1: Use backpack integrated detection equipment to receive medium wave navigation signals and short-range navigation ranging and direction finding signals; Step 2: Preprocess the received signal, including amplification, filtering and analog-to-digital conversion; Step 3: Use the envelope detection algorithm to process the medium wave navigation signal and extract the amplitude change information of the signal. The envelope detection algorithm formula is: in, is the input signal, is the output envelope signal; Step 4: Perform intermediate frequency demodulation on the signal after envelope detection, and pass the demodulated signal through a bandpass filter with a center frequency of 90 Hz; Step 5: Perform phase detection processing to obtain the phase information of the signal. The phase detection algorithm formula is: in, and are the real and imaginary parts of the signal respectively; Step 6: low-pass filter the phase information to smooth the filtered phase data; Step 7: Use the inverse tangent function to process the filtered phase data to obtain the relative azimuth information. The inverse tangent formula is: ; Where x and y are the processed signal components respectively; Step 8: Demodulate the short-range navigation ranging and direction finding signal at an intermediate frequency, and perform Gaussian pulse pair recognition and decoding processing on the demodulated signal; Step 9: Perform 15Hz and 135Hz envelope detection processing on the decoded signal to obtain the main and auxiliary reference signals; Step 10: Perform coarse azimuth measurement, precise azimuth measurement and distance measurement based on the primary and secondary reference signals, and finally output the comprehensive detection result of the navigation signal.

6. The navigation signal comprehensive detection method according to claim 5, characterized in that: In the inverse tangent function processing, the result of the inverse tangent function is linearized to improve the accuracy of azimuth angle measurement.

7. The navigation signal comprehensive detection method according to claim 5, characterized in that: In the Gaussian pulse pair identification and decoding process, a matched filtering algorithm is used to extract pulse pairs from the signal. The matched filtering formula is: in, is the input signal, is the matched filter impulse response.

8. The navigation signal comprehensive detection method according to claim 5, characterized in that: The azimuth is roughly measured by using a phase difference method to calculate the azimuth according to the phase difference between two different receiving antennas.

9. The navigation signal comprehensive detection method according to claim 5, characterized in that: The azimuth precision measurement adopts the interferometer method to calculate the precise azimuth angle through the phase difference of multiple receiving antennas.

10. The navigation signal comprehensive detection method according to claim 5, characterized in that: The distance measurement process adopts the time difference method to calculate the distance information according to the time difference between signal transmission and reception. The time difference distance measurement formula is: ;in, is the speed of light, is the time difference between signal transmission and reception.

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