A frequency hopping signal angle tracking system and a frequency hopping signal testing method

Abstract

The present invention discloses a frequency hopping signal angle tracking system and a frequency hopping signal testing method, and belongs to the field of communication technology. The system includes a signal generating unit, an attenuator, an amplifier, a synthesizer, a noise source, a power divider, a spectrum analyzer and a tracking receiver; the attenuator is respectively connected to the signal generating unit and the amplifier, the amplifier is also connected to the synthesizer, the synthesizer is also respectively connected to the noise source and the power divider, and the power divider is also respectively connected to the spectrum analyzer and the tracking receiver. The frequency hopping signal angle tracking system and the frequency hopping signal testing method proposed in the present invention can solve the problem that the prior art cannot simulate the frequency hopping signal source to conduct comprehensive testing and delivery acceptance of specific frequency hopping signals, resulting in difficulties in equipment performance verification, increased risk of product failure, and failure to meet user needs.

Description

Technical Field

[0001] The invention relates to the field of communication technology, and in particular to a frequency hopping signal angle tracking system and a frequency hopping signal testing method. Background Art

[0002] In the field of communications, frequency hopping technology is widely used in wireless communications, military communications, wireless sensor networks and other fields. Frequency hopping signals transmit data by switching frequencies at different times and frequencies to increase anti-interference and ensure the security and reliability of communications. In order to ensure that the performance and functions of frequency hopping equipment meet the specification requirements, it is crucial to test specific frequency hopping signals.

[0003] However, the current existing technology is unable to simulate the frequency hopping signal source to conduct comprehensive testing and delivery acceptance of the developed and produced frequency hopping signals, which leads to a series of problems, such as difficulty in equipment performance verification, increased risk of product failure, delivery acceptance issues, and failure to meet user needs.

[0004] Therefore, there is an urgent need for a system and a testing method that can simulate a frequency hopping signal source and perform a comprehensive test on a specific frequency hopping signal, so as to perform a comprehensive test on factory equipment. Summary of the invention

[0005] The present invention aims to propose a frequency hopping signal angle tracking system and a frequency hopping signal testing method to solve the problems that the prior art cannot simulate the frequency hopping signal source to perform comprehensive testing and delivery acceptance of specific frequency hopping signals, resulting in difficulties in equipment performance verification, increased risk of product failure, and failure to meet user needs.

[0006] In view of the problems existing in the prior art, the technical solution adopted by the present invention is:

[0007] A frequency hopping signal angle tracking system comprises a signal generating unit, an attenuator, an amplifier, a synthesizer, a noise source, a power divider, a spectrum analyzer and a tracking receiver; the attenuator is respectively connected to the signal generating unit and the amplifier, the amplifier is also connected to the synthesizer, the synthesizer is also respectively connected to the noise source and the power divider, and the power divider is also respectively connected to the spectrum analyzer and the tracking receiver.

[0008] Optionally, the signal generating unit includes an FPGA module and a digital-to-analog conversion unit; the FPGA module includes a data generator, a DDS signal generator, a modulation unit, a switch and a selection signal unit; the modulation unit is respectively connected to the DDS signal generator, the data generator and the switch, and the switch is also respectively connected to the selection signal unit and the digital-to-analog conversion unit.

[0009] Optionally, the tracking receiver includes a sum input signal channel and a difference input signal channel, and the sum input signal channel and the difference input signal channel are respectively connected to the power divider through filters.

[0010] To achieve the above object, the present invention further provides a frequency hopping signal testing method, which is used in the frequency hopping signal angle tracking system as described above, comprising:

[0011] S100: Connecting the first frequency signal generated by the signal generating unit to the tracking receiver, and if the function of the tracking receiver is normal, determining that the input signal frequency of the tracking receiver is the first frequency;

[0012] S200: Connecting a frequency hopping signal of a first frequency hopping rate within a first frequency range to the tracking receiver, and if the function of the tracking receiver is normal, confirming that the tracking system of the tracking receiver is a single-channel single-pulse;

[0013] S300: Connecting a frequency hopping signal of a first frequency hopping rate within a first frequency range to the tracking receiver, and if the tracking receiver functions normally, confirming that the input signal type of the tracking receiver is a frequency hopping signal;

[0014] S400: In the frequency hopping signal mode, a frequency hopping signal of a first frequency hopping rate is connected to the tracking receiver, and the output level value of the signal generating unit is adjusted so that the level of the sum input signal of the tracking receiver changes from a first level value to a second level value, and the size of the noise source is adjusted so that the signal-to-noise ratio of the frequency hopping signal is greater than or equal to a first ratio. If the function of the tracking receiver is normal, it is confirmed that the input signal type of the tracking receiver is a frequency hopping signal;

[0015] S500: In the frequency hopping signal mode, adjusting the amplification value of the amplifier and the output level value of the signal generating unit so that the signal-to-noise ratio of the input signal of the tracking receiver is greater than or equal to a first ratio, and if the function of the tracking receiver is normal, confirming that the minimum locking threshold of the frequency hopping signal of the tracking receiver is greater than or equal to the first ratio;

[0016] S600: In the frequency hopping signal mode, adjusting the amplification value of the amplifier and the output level value of the signal generating unit so that the minimum tracking threshold of the tracking receiver is greater than or equal to the second ratio, and if the function of the tracking receiver is normal, confirming that the minimum tracking threshold of the frequency hopping signal of the tracking receiver is greater than or equal to the second ratio;

[0017] S700: adjusting the signal generating unit so that the sum path signal of the tracking receiver is at a preset level, the phase is corrected, the degree of the phase shifter is taken when the error voltage is the maximum positive value, the azimuth and elevation multiplication factors are kept unchanged, and the amplification factor is adjusted to remain unchanged, so that the amplitude difference of the sum and difference path signals is respectively the first value and the second value, so as to test whether the output difference slope of the tracking receiver is the first output difference slope;

[0018] S800: Connect a frequency hopping signal of a first frequency hopping rate within a first frequency range to the tracking receiver to test whether the data transmission rate of the tracking receiver is the first transmission rate.

[0019] Optionally, the first frequency is 70MHz, the first frequency hopping rate is 20000 hops / s, the first level value is -50dBm, the second level value is 0dBm, the first ratio is 10, the second ratio is 12, the first value is 17dB, the second value is 23dB, the first output difference slope is 2.5~3.5V / 0.5°, and the first transmission rate is 20b / s.

[0020] Optionally, step S700 is tested when the indoor simulated antenna is deviated by 0.5°, and the simulation is performed using a difference signal variation of 6 dB.

[0021] Optionally, the DDS signal generator generates a carrier frequency, the data generated by the data generator is modulated onto the carrier frequency through the modulation unit, the selection signal unit selects 8 50us selection signals with a period of 10ms, and the selection signal is output as a frequency hopping signal through a switch and the digital-to-analog conversion unit in turn.

[0022] The beneficial effects of the technical solution proposed by the present invention are:

[0023] The present invention provides a frequency hopping signal angle tracking system based on a specific frequency hopping signal source and a frequency hopping signal testing method. The method generates a specific frequency hopping signal using an FPGA signal processing board, and completes the testing of system performance indicators such as AGC control range, angle error slope, and frequency hopping capture threshold through a frequency hopping angle tracking system composed of a fixed gain amplifier, a variable attenuator, and a frequency hopping tracking receiver, thereby providing a guarantee for the acceptance of the specific frequency hopping signal angle tracking system.

[0024] The present invention provides a test source for the frequency hopping device, ensuring the comprehensiveness of the device factory test; provides a simulated test service for similar products that receive the signal; and also provides a test method for a specific frequency hopping system, providing guidance for the test basis in the subsequent equipment production process, so as to reduce the risk of product failure, solve delivery acceptance problems, and meet user requirements for equipment performance and functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of the structure of a frequency hopping signal angle tracking system provided by the first embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a signal generating unit of a frequency hopping signal angle tracking system provided by the first embodiment of the present invention;

[0028] Figure 3 An output signal waveform diagram of a signal generating unit of a frequency hopping signal angle tracking system provided by the first embodiment of the present invention;

[0029] Figure 4 A test link level distribution diagram of a frequency hopping signal angle tracking system provided by the first embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a flow chart of a frequency hopping signal testing method provided by the first embodiment of the present invention;

[0031] Figure 6 A schematic diagram of test results of data transmission rate of the frequency hopping signal test method provided in the first embodiment of the present invention.

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0034] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiments of the present application The frequency hopping signal angle tracking system used in the technical implementation of the present application will be described below:

[0036] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the frequency hopping signal angle tracking system involved in the embodiment of the present application.

[0037] The frequency hopping signal angle tracking system comprises a signal generating unit, an attenuator, an amplifier, a synthesizer, a noise source, a power divider, a spectrum analyzer and a tracking receiver; the attenuator is respectively connected to the signal generating unit and the amplifier, the amplifier is also connected to the synthesizer, the synthesizer is also respectively connected to the noise source and the power divider, and the power divider is also respectively connected to the spectrum analyzer and the tracking receiver.

[0038] See also Figure 2 The signal generating unit includes an FPGA module and a digital-to-analog conversion unit; the FPGA module includes a data generator, a DDS signal generator, a modulation unit, a switch and a selection signal unit; the modulation unit is respectively connected to the DDS signal generator, the data generator and the switch, and the switch is also respectively connected to the selection signal unit and the digital-to-analog conversion unit.

[0039] Specifically, the signal waveform output by a specific frequency hopping signal source is as follows: Figure 3 As shown in the figure, the test link level distribution diagram of a specific frequency hopping signal angle tracking system is as follows Figure 4 shown.

[0040] The signal generating unit comprises a signal generator, model SMIQ03S; a spectrum analyzer, model 4051F; an amplifier and a power divider, model 70M; and a variable attenuator, model 0-69dBm.

[0041] Embodiments of the present application In the following, the frequency hopping signal testing method used in the technical implementation of the present application will be described. Figure 5 , the method comprising:

[0042] S100: Connecting the first frequency signal generated by the signal generating unit to the tracking receiver, and if the function of the tracking receiver is normal, determining that the input signal frequency of the tracking receiver is the first frequency;

[0043] S200: Connecting a frequency hopping signal of a first frequency hopping rate within a first frequency range to the tracking receiver, and if the function of the tracking receiver is normal, confirming that the tracking system of the tracking receiver is a single-channel single-pulse;

[0044] S300: Connecting a frequency hopping signal of a first frequency hopping rate within a first frequency range to the tracking receiver, and if the tracking receiver functions normally, confirming that the input signal type of the tracking receiver is a frequency hopping signal;

[0045] S400: In the frequency hopping signal mode, a frequency hopping signal of a first frequency hopping rate is connected to the tracking receiver, and the output level value of the signal generating unit is adjusted so that the level of the sum input signal of the tracking receiver changes from a first level value to a second level value, and the size of the noise source is adjusted so that the signal-to-noise ratio of the frequency hopping signal is greater than or equal to a first ratio. If the function of the tracking receiver is normal, it is confirmed that the input signal type of the tracking receiver is a frequency hopping signal;

[0046] S500: In the frequency hopping signal mode, adjusting the amplification value of the amplifier and the output level value of the signal generating unit so that the signal-to-noise ratio of the input signal of the tracking receiver is greater than or equal to a first ratio, and if the function of the tracking receiver is normal, confirming that the minimum locking threshold of the frequency hopping signal of the tracking receiver is greater than or equal to the first ratio;

[0047] S600: In the frequency hopping signal mode, adjusting the amplification value of the amplifier and the output level value of the signal generating unit so that the minimum tracking threshold of the tracking receiver is greater than or equal to the second ratio, and if the function of the tracking receiver is normal, confirming that the minimum tracking threshold of the frequency hopping signal of the tracking receiver is greater than or equal to the second ratio;

[0048] S700: adjusting the signal generating unit so that the sum path signal of the tracking receiver is at a preset level, the phase is corrected, the degree of the phase shifter is taken when the error voltage is the maximum positive value, the azimuth and elevation multiplication factors are kept unchanged, and the amplification factor is adjusted to remain unchanged, so that the amplitude difference of the sum and difference path signals is respectively the first value and the second value, so as to test whether the output difference slope of the tracking receiver is the first output difference slope;

[0049] Specifically, this step is tested under the condition that the indoor simulated antenna is deviated by 0.5°, and the simulation is performed using a difference signal variation of 6 dB.

[0050] S800: Connect a frequency hopping signal of a first frequency hopping rate within a first frequency range to the tracking receiver to test whether the data transmission rate of the tracking receiver is the first transmission rate.

[0051] Furthermore, the first frequency is 70MHz, the first frequency hopping rate is 20000 hops / s, the first level value is -50dBm, the second level value is 0dBm, the first ratio is 10, the second ratio is 12, the first value is 17dB, the second value is 23dB, the first output difference slope is 2.5~3.5V / 0.5°, and the first transmission rate is 20b / s.

[0052] Furthermore, in the signal generating unit, the DDS signal generator generates a carrier frequency, the data generated by the data generator is modulated onto the carrier frequency through the modulation unit, the selection signal unit selects 8 50us selection signals with a period of 10ms, and the selection signal passes through the switch and the digital-to-analog conversion unit in turn to output a frequency hopping signal.

[0053] Specifically, the test steps of the frequency hopping signal test method proposed by the present invention are as follows:

[0054] S100: Input signal frequency test: Connect a signal within the 70MHz range to the receiver and monitor and observe. If all functions of the receiver are normal, it is confirmed that the input frequency of the 70M dual-channel frequency hopping tracking receiver is 70MHz.

[0055] S200: Tracking system test: Connect a medium-strong frequency hopping signal (hopping rate 20,000 hops / s) within the 70MHz range to the receiver. Through monitoring and observation, if all functions of the receiver are normal, it is confirmed that the input signal system of the 70M dual-channel frequency hopping tracking receiver is a single-channel single pulse.

[0056] S300: Input signal characteristic test: Connect a medium-strong frequency hopping signal (hopping rate 20,000 hops / s) within the 70MHz range to the receiver. Through monitoring and observation, if all functions of the receiver are normal, it is confirmed that the input signal type of the 70M dual-channel frequency hopping tracking receiver is a frequency hopping signal.

[0057] S400: Input signal level test: In frequency hopping signal mode, input frequency hopping signal (hopping rate 20000 hops / s), adjust the output level value of the signal source, so that the receiver's sum input signal level changes from -50dBm to 0dBm, and adjust the size of the noise source at the same time. The frequency hopping signal-to-noise ratio S / N ≥ 10dB, and observe through monitoring whether the lock indication is locked normally; if all functions of the receiver are normal, it is confirmed that the input signal type of the 70M dual-channel frequency hopping tracking receiver is a frequency hopping signal.

[0058] S500: Capture threshold test: In the frequency hopping signal mode, adjust the amplification value of the amplifier and frequency converter and the output level value of the signal source so that the input signal-to-noise ratio of the tracking receiver is: S / N ≥ 10dB, and observe the locking status of the receiver through monitoring; if all functions of the receiver are normal, it means that the minimum locking threshold S / N of the frequency hopping signal of the 70M dual-channel frequency hopping tracking receiver is ≥ 10dB.

[0059] S600: Tracking threshold test: In the frequency hopping signal mode, adjust the amplification value of the amplifier and frequency converter and the output level value of the signal source so that the minimum tracking threshold of the tracking receiver is: S / N ≥ 12dB, and observe the locking status of the receiver through monitoring; if all functions of the receiver are normal, it means that the minimum tracking threshold S / N of the frequency hopping signal of the 70M dual-channel frequency hopping tracking receiver is ≥ 12dB.

[0060] S700: Output difference slope test: Adjust the signal source to make the receiver phase calibrate when the sum signal is at a medium-strong level. Both azimuth and elevation can be calibrated. After the phase calibration, take the phase shifter degree when the error voltage is the maximum positive (usually azimuth and elevation differ by 90 degrees), keep the azimuth and elevation multipliers unchanged, and adjust the amplification factor appropriately to keep it unchanged, so that the amplitude differences of the sum and difference signals are 17dB and 23dB respectively. For example, if the verification signal takes 23dB as 1mil (1.5V), then 17dB is 2mil (3V), and observe whether the change of the error voltage is normal.

[0061] This step is tested indoors when the simulated antenna is deviated by 0.5°, and the simulation is performed using a 6dB difference signal change.

[0062] S800: Data transmission rate test: Connect a medium-strong frequency hopping signal (frequency hopping rate 20,000 hops / s) within the 70MHz range to the receiver, and observe (acquired by oscilloscope) whether the ACU data uploaded by the receiver is 20Hz. The test results are as follows: Figure 6 shown.

[0063] The present invention provides a frequency hopping signal angle tracking system based on a specific frequency hopping signal source and a frequency hopping signal testing method. The method generates a specific frequency hopping signal using an FPGA signal processing board, and completes the testing of system performance indicators such as AGC control range, angle error slope, and frequency hopping capture threshold through a frequency hopping angle tracking system composed of a fixed gain amplifier, a variable attenuator, and a frequency hopping tracking receiver, thereby providing a guarantee for the acceptance of the specific frequency hopping signal angle tracking system.

[0064] The present invention designs a test source for the frequency hopping equipment developed and produced, thereby ensuring the comprehensiveness of the equipment's factory test; provides a simulated test service for similar products that receive the signal; and provides a test method for a specific frequency hopping system, providing guidance for the test basis in the subsequent equipment production process, so as to reduce the risk of product failure, solve delivery acceptance problems, and meet user requirements for equipment performance and functions.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A frequency hopping signal testing method, comprising the following steps: S100: Connecting the first frequency signal generated by the signal generating unit to the tracking receiver, and if the tracking receiver functions normally, determining that the input signal frequency of the tracking receiver is the first frequency; S200: Connecting a frequency hopping signal of a first frequency hopping rate within a first frequency range to a tracking receiver, and if the tracking receiver functions normally, confirming that the tracking system of the tracking receiver is a single-channel single-pulse; S300: Connecting a frequency hopping signal of a first frequency hopping rate within a first frequency range to a tracking receiver, and if the tracking receiver functions normally, confirming that the input signal type of the tracking receiver is a frequency hopping signal; S400: In the frequency hopping signal mode, a frequency hopping signal of a first frequency hopping rate is connected to the tracking receiver, an output level value of a signal generating unit is adjusted so that a level of a sum input signal of the tracking receiver changes from a first level value to a second level value, and a noise source is adjusted so that a signal-to-noise ratio of the frequency hopping signal is greater than or equal to a first ratio. If the tracking receiver functions normally, it is confirmed that the input signal type of the tracking receiver is a frequency hopping signal. S5 00: In the frequency hopping signal mode, adjust the amplification value of the amplifier and the output level value of the signal generating unit so that the signal-to-noise ratio of the input signal of the tracking receiver is greater than or equal to the first ratio. If the tracking receiver functions normally, confirm that the minimum locking threshold of the frequency hopping signal of the tracking receiver is greater than or equal to the first ratio. S600: In the frequency hopping signal mode, adjusting the amplification value of the amplifier and the output level value of the signal generating unit so that the minimum tracking threshold of the tracking receiver is greater than or equal to the second ratio. If the tracking receiver functions normally, confirming that the minimum tracking threshold of the frequency hopping signal of the tracking receiver is greater than or equal to the second ratio; S700: adjusting the signal generating unit so that the sum path signal of the tracking receiver is at a preset level, the phase is corrected, the degree of the phase shifter when the error voltage is the maximum positive value is taken, the azimuth and elevation multiplication factors are kept unchanged, and the amplification factor is adjusted to remain unchanged, so that the amplitude difference of the sum and difference path signals is respectively the first value and the second value, so as to test whether the output difference slope of the tracking receiver is the first output difference slope; S800: Connect a frequency hopping signal of a first frequency hopping rate within a first frequency range to a tracking receiver to test whether the data transmission rate of the tracking receiver is the first transmission rate.

2. A frequency hopping signal testing method according to claim 1, characterized in that: The first frequency is 70MHz, the first frequency hopping rate is 20000 hops / s, the first level value is -50dBm, the second level value is 0dBm, the first ratio is 10, the second ratio is 12, the first value is 17dB, the second value is 23dB, the first output difference slope is 2.5~3.5V / 0.5°, and the first transmission rate is 20b / s.

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