A portable signal polarization detection method

Abstract

The present application relates to the field of electronic countermeasure, especially to a portable signal polarization detection method, which comprises a portable signal polarization detection device, the portable signal polarization detection device is composed of a first antenna, a second antenna and a receiving polarization test equipment, the first antenna and the second antenna are connected to the receiving polarization test equipment through equal-amplitude and equal-phase radio frequency cables; the working frequency bands of the first antenna and the second antenna should be consistent with the signal frequency to be measured, or should cover the signal frequency to be measured; the first antenna and the second antenna are linear polarization antennas, the two antennas are orthogonally installed together, the first antenna is a horizontal polarization antenna, and the second antenna is a vertical polarization antenna. The operation is simple, the measurement is fast, the volume is small, the weight is light, and the portable signal polarization detection device is convenient to carry or integrated with other equipment.

Description

Technical Field

[0001] This invention relates to the field of electronic countermeasures, and in particular to a portable signal polarization detection method, which enables the detection of the polarization characteristics of detected signals. Background Technology

[0002] Portable signal polarization detection devices typically include a horizontally polarized antenna, a vertically polarized antenna, and a dual-channel polarization measurement module. Existing signal polarization measurement equipment either uses three antennas (i.e., three-component vector signal polarization testing) or an antenna array for signal polarization testing. While these devices offer high measurement accuracy, they are bulky, expensive, and lack portability. They cannot meet the needs of scenarios where high polarization measurement accuracy is not required and portability is essential. Therefore, this invention proposes a portable signal polarization detection device that can be used quickly and easily to detect signal polarization information. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a portable signal polarization detection method. The antenna of this invention comprises horizontal and vertical linearly polarized antennas with orthogonal polarization. The two signals received through the orthogonal antennas are processed by a signal measurement device to quickly measure the polarization characteristics of the received signal. The polarization measurement results are displayed using indicator lights, a screen, or other means. The method is simple to operate, fast in measurement, small in size and light in weight, making it easy to carry or integrate with other devices.

[0004] The objective technical solution of this invention is: a portable signal polarization detection method, comprising a portable signal polarization detection device, which consists of a first antenna, a second antenna, and a receiving polarization testing device. The amplitude and phase of the first antenna signal are A1, Ф1; the amplitude and phase of the second antenna signal are A2, Ф2. The first antenna and the second antenna are connected to the receiving polarization testing device via equal-amplitude and equal-phase radio frequency cables. The method is characterized in that: the operating frequency bands of the first and second antennas should be consistent with or cover the frequency of the signal being measured; the first and second antennas are linearly polarized antennas, and the two antennas are orthogonally polarized and installed together. The first antenna is a horizontally polarized antenna, and the second antenna is a vertically polarized antenna. The working process is as follows:

[0005] Step 1: At the start of the measurement, the amplitudes of the two signals are compared. When the amplitudes of the two signals differ significantly, the signal is determined to be linearly polarized. When the output of A2 is zero, the signal is determined to be horizontally polarized. When the output of A1 is zero, the signal is determined to be vertically polarized.

[0006] Step 2: When the amplitudes of the two signals differ significantly, but neither signal is zero, the signal is determined to be elliptic polarized.

[0007] Step 3: Based on the determination that the signal is elliptical polarized, determine whether it is left-handed or right-handed polarization according to the phase difference between the two signals. Use equipment to test the left-handed elliptical polarized signal and record the relationship between phase Ф1 and phase Ф2 at this time to determine the correspondence between the phase difference change and elliptical polarization.

[0008] Step 4: When the amplitudes of the two signals are the same, determine the phase difference between the two signals. When the phase difference between the two signals remains basically constant, the signal is determined to be obliquely polarized. If the phase difference (|Ф1-Ф2|) between the two signals fluctuates greatly, the signal is determined to be circularly polarized.

[0009] Step 5: Based on the determination that the signal is slanted polarized, determine whether it is left-slanted or right-slanted polarized according to the sign relationship of the phase difference (Ф1-Ф2) between the two signals. Use the equipment to test the left-slanted polarized signal and record the sign of the difference between phase Ф1 and phase Ф2 at this time to determine the correspondence between the phase difference sign and slanted polarization.

[0010] Step 6: Based on the determination that the signal is circularly polarized, determine whether it is left-handed or right-handed circularly polarized according to the change relationship of the phase difference (Ф1-Ф2) between the two signals. Use equipment to test the right-handed circularly polarized signal and record the change in the difference between phase Ф1 and phase Ф2 at this time to determine the correspondence between the phase difference change and circular polarization.

[0011] Compared with the prior art, this invention has the following significant advantages: 1) simple operation and use; 2) fast detection speed; 3) easy to carry or integrate with other systems. Attached Figure Description

[0012] Figure 1 Block diagram of polarization testing equipment.

[0013] Figure 2 Block diagram of receiving polarization measurement equipment.

[0014] Figure 3 Polarization measurement flowchart.

[0015] Explanation of reference numerals in the attached diagram: First antenna 1, Second antenna 2, Polarization test equipment 3, First RF amplification and frequency conversion filter channel 31, Second RF amplification and frequency conversion filter channel 32, Polarization measurement module 33, Display module 34. Detailed Implementation

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0017] For example Figure 1 and Figure 2As shown, a portable signal polarization detection device of the present invention includes a first antenna 1, a second antenna 2, and a receiving polarization testing device 3. The first antenna 1 and the second antenna 2 are connected to the receiving polarization testing device 3 via equal-amplitude and equal-phase radio frequency cables. The polarization characteristics of the received signal can be quickly detected by the receiving polarization testing device 3 through the signals received by the first antenna 1 and the second antenna 2. The operating frequency bands of the first antenna 1 and the second antenna 2 should be consistent with or cover the frequency of the signal being measured. The first antenna 1 and the second antenna 2 are linearly polarized antennas, and the two antennas are installed together with orthogonal polarization, maintaining one horizontal polarization and one vertical polarization, and having a certain degree of polarization isolation.

[0018] like Figure 2 As shown, the receiving polarization test device 3 of the present invention includes two radio frequency amplification and frequency conversion filtering channels with identical characteristics (first radio frequency amplification and frequency conversion filtering channel 31 and second radio frequency amplification and frequency conversion filtering channel 32), a polarization measurement module 33, and a display module 34. The first radio frequency amplification and frequency conversion filtering channel 31 and the second radio frequency amplification and frequency conversion filtering channel 32 select the received signal frequency through frequency sweeping, and the two radio frequency amplification and frequency conversion filtering channels use the same frequency sweeping source module for output. The operating frequency range of the radio frequency amplification and frequency conversion filtering channels should cover the operating frequency of the signal under test.

[0019] The polarization measurement module 33 in the receiving polarization test device 3 of the present invention completes the acquisition and digital-to-analog conversion of the output signal of the RF amplification, frequency conversion and filtering channel, and completes the comparison processing of the two input signals in the program to realize the measurement of signal polarization characteristics.

[0020] The display module 34 in the receiving polarization test device 3 of the present invention is used to display the measurement results of signal polarization characteristics. It can be an indicator light, a display screen, or it can output through a communication interface.

[0021] like Figure 3 As shown, the working process of a portable signal polarization detection method of the present invention is as follows:

[0022] Polarization characteristics are determined by measuring the amplitude (A1 and A2) and phase (Ф1 and Ф2) of the signals received from the two channels. Assume the first antenna 1 is a horizontally polarized antenna with amplitude and phase A1 and Ф1, and the second antenna 2 is a vertically polarized antenna with amplitude and phase A2 and Ф2, respectively.

[0023] Step 1. At the start of measurement, first compare the amplitudes of the two signals (A1 and A2). When the amplitudes of the two signals differ significantly (where the output of one path is almost zero and the difference in amplitudes is more than 100 times, it is considered a significant difference), at this time, the signal is determined to be linearly polarized. When the output of A2 is zero, the signal is determined to be horizontally polarized, and when the output of A1 is zero, the signal is determined to be vertically polarized.

[0024] Step 2. When the amplitudes of the two signals differ significantly (A1 > A2 or A1 < A2), but the output of any one signal is not zero, at this time, the signal is determined to be elliptically polarized.

[0025] Step 3. On the basis of determining that the signal is elliptically polarized, then determine whether it is left-handed polarization or right-handed polarization according to the change relationship of the phase difference (Ф1 - Ф2) between the two signals. The relationship between the phase difference change and the left and right of the elliptical polarization needs to be determined by experiments in the laboratory first (test the left-handed elliptically polarized signal with equipment in the laboratory, record the relationship between the phase Ф1 and the phase Ф2 at this time, and thus determine the corresponding relationship between the phase difference change and the elliptical polarization).

[0026] Step 4. When the amplitudes of the two signals are the same (A1 ≈ A2) (for example, if the difference in amplitudes is within the 10% range, it is considered that the amplitudes are the same), then determine the phase difference (|Ф1 - Ф2|) between the two signals. When the phase difference between the two signals remains basically unchanged (the phase difference less than 10° is considered to remain unchanged), at this time, the signal is determined to be obliquely polarized. If the phase difference (|Ф1 - Ф2|) between the two signals fluctuates greatly (for example, the phase difference greater than 10° is considered to fluctuate greatly), the signal is determined to be circularly polarized.

[0027] Step 5. On the basis of determining that the signal is obliquely polarized, then determine whether it is left-handed obliquely polarized or right-handed obliquely polarized according to the sign relationship of the phase difference (Ф1 - Ф2) between the two signals. The relationship between the phase difference sign and the left and right of the oblique polarization needs to be determined by experiments (test the left-handed obliquely polarized signal with equipment in the laboratory, record the difference sign between the phase Ф1 and the phase Ф2 at this time, and thus determine the corresponding relationship between the phase difference sign and the oblique polarization).

[0028] Step 6. On the basis of determining that the signal is circularly polarized, then determine whether it is left-handed polarization or right-handed polarization according to the change relationship of the phase difference (Ф1 - Ф2) between the two signals. The relationship between the phase difference change and the left and right of the circular polarization needs to be determined by experiments in the laboratory first (test the right-handed circularly polarized signal with equipment in the laboratory, record the change of the difference between the phase Ф1 and the phase Ф2 at this time, and thus determine the corresponding relationship between the phase difference change and the circular polarization).

[0029] Therefore, by comparing the amplitude and phase characteristics of signals received by horizontally and vertically polarized antennas, the polarization characteristics of a signal can be quickly determined. Although the accuracy of this method is not high, it is fast, simple, requires little equipment, and the equipment manufactured using this method is inexpensive and portable.

[0030] Compared with the prior art, this invention has the following significant advantages: 1) simple operation and use; 2) fast detection speed; 3) easy to carry or integrate with other systems.

[0031] This invention can be applied to signal polarization measurement and testing in various fields, such as signal detection and signal interference in electronic countermeasures, radar, and communications. It is simple to operate, has a fast measurement speed, and is small in size and lightweight, making it easy to carry or integrate with other equipment.

Claims

1. A portable signal polarization detection method, performed using a portable signal polarization detection device, the portable signal polarization detection device comprising a first antenna, a second antenna, and a receiving polarization test device, wherein the amplitude and phase of the first antenna signal are A1, Ф1; the amplitude and phase of the second antenna signal are A2, Ф2; the first antenna and the second antenna are connected to the receiving polarization test device via equal-amplitude and equal-phase radio frequency cables; characterized in that: The operating frequency bands of the first antenna and the second antenna should be the same as or cover the frequency of the measured signal; the first antenna and the second antenna are linear polarization antennas, and the two antennas are orthogonally polarized and installed together. The first antenna is a horizontally polarized antenna, and the second antenna is a vertically polarized antenna. The working process is as follows: Step 1: At the beginning of the measurement, first compare the amplitudes of the two signals. When the output of one path is zero and the amplitude difference value is more than 100 times, the signal is determined to be linearly polarized at this time; when the output of A2 is zero, the signal is determined to be horizontally polarized, and when the output of A1 is zero, the signal is determined to be vertically polarized; Step 2: When the amplitudes of the two signals A1 > A2 or A1 < A2, but the output of any one signal is not zero, the signal is determined to be elliptically polarized at this time; Step 3: On the basis of determining that the signal is elliptically polarized, determine whether it is left-handed polarization or right-handed polarization according to the change relationship of the phase difference between the two signals. Use the equipment to test the left-handed elliptically polarized signal, and record the relationship between the phase Ф1 and the phase Ф2 at this time, so as to determine the corresponding relationship between the phase difference change and the elliptical polarization; Step 4: When the amplitudes of the two signals are the same, determine the phase difference between the two signals. When the phase difference between the two signals is less than 10°, the signal is determined to be obliquely polarized at this time; if the phase difference between the two signals (|Ф1-Ф2|) is greater than 10°, the signal is determined to be circularly polarized; Step 5: On the basis of determining that the signal is obliquely polarized, determine whether it is left-handed oblique polarization or right-handed oblique polarization according to the sign relationship of the phase difference (Ф1-Ф2) between the two signals. Use the equipment to test the left-handed oblique polarized signal, and record the difference sign of the phase Ф1 and the phase Ф2 at this time, so as to determine the corresponding relationship between the phase difference sign and the oblique polarization; Step 6: On the basis of determining that the signal is circularly polarized, determine whether it is left-handed polarization or right-handed polarization according to the change relationship of the phase difference (Ф1-Ф2) between the two signals. Use the equipment to test the right-handed circularly polarized signal, and record the change of the difference between the phase Ф1 and the phase Ф2 at this time, so as to determine the corresponding relationship between the phase difference change and the circular polarization.

2. The portable signal polarization detection method according to claim 1, characterized in that: The receiving polarization test equipment includes two first radio frequency amplification frequency conversion filtering channels, a second radio frequency amplification frequency conversion filtering channel, a polarization measurement module and a display module with the same characteristics; the first radio frequency amplification frequency conversion filtering channel and the second radio frequency amplification frequency conversion filtering channel select the received signal frequency through frequency sweeping, and the two radio frequency amplification frequency conversion filtering channels are output by the same frequency sweeping source module; the working frequency range of the radio frequency amplification frequency conversion filtering channel should cover the working frequency of the measured signal.

3. The portable signal polarization detection method according to claim 1, characterized in that: The polarization measurement module in the receiving polarization test equipment completes the acquisition and digital-to-analog conversion of the output signal of the radio frequency amplification frequency conversion filtering channel, and completes the comparison and processing of the two input signals in the program to realize the measurement of the signal polarization characteristics.

4. The portable signal polarization detection method according to claim 1, characterized in that: The display module in the receiving polarization test equipment is used to complete the display of the measurement results of the signal polarization characteristics.

5. A portable signal polarization detection method according to claim 1 or 2, characterized in that: In Step 4, when the amplitude difference value is within the 10% interval, the amplitudes are considered to be the same.

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