Portable signal polarization detection method

Abstract

The invention relates to the field of electronic countermeasures, in particular 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 device, the second antenna is connected to the receiving polarization test equipment through an equal-amplitude and equal-phase radio frequency cable; the working frequency bands of the first antenna and the second antenna are consistent with the frequency of a measured signal or cover the frequency of the measured signal; the first antenna and the second antenna are linear polarization antennas, the two antennas are installed together in a polarization orthogonality mode, the first antenna is a horizontal polarization antenna, and the second antenna is a vertical polarization antenna. The device is simple to operate and use, high in measurement speed, small in size, light in weight, and convenient to carry or integrate with other equipment for use.

Description

Technical Field

[0001] The invention relates to the field of electronic countermeasures, and in particular to a portable signal polarization detection method. The invention realizes detection of polarization characteristics of detected signals. Background Art

[0002] A portable signal polarization detection device generally includes a horizontal polarization antenna, a vertical polarization 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 uses an antenna array for signal polarization testing. Although these devices have high measurement accuracy, they are large in quantity, expensive, and lack portability. They cannot meet the needs of some scenarios where the requirements for polarization measurement accuracy are not high and portable use is required. Based on this, the present invention proposes a portable signal polarization detection device that can be used portablely to quickly detect the polarization information of the signal. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a portable signal polarization detection method. The antenna of the present invention comprises a horizontal and a vertical linear polarization antenna, and the polarizations of the two antennas are orthogonal. The two signals received by the orthogonal antennas are received and processed by a signal measuring device, and the polarization characteristic measurement of the received signal can be quickly realized. The polarization measurement results are displayed by means of indicator lights, display screens, etc. The operation is simple, the measurement speed is fast, the size is small, the weight is light, and it is easy to carry or integrated with other devices.

[0004] The technical solution of the purpose of the present invention is: a portable signal polarization detection method, including 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 device, the amplitude and phase of the first antenna signal are A1, Φ1; the amplitude and phase of the second antenna signal are A2, Φ2, the first antenna and the second antenna are connected to the receiving polarization test device through radio frequency cables with equal amplitude and phase; it is characterized in that: the working frequency band of the first antenna and the second antenna should be consistent with the frequency of the measured signal, or should cover the frequency of the measured signal; the first antenna and the second antenna are linearly polarized antennas, the two antennas are orthogonally installed together, the first antenna is a horizontally polarized antenna, and the second antenna is a vertically polarized antenna, and its working process is:

[0005] Step 1: At the beginning of the measurement, compare the amplitudes of the two signals. When the amplitudes of the two signals differ greatly, 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 greatly, but any one of the signals is not zero, the signal is determined to be elliptical polarization;

[0007] Step 3: On the basis of determining that the signal is elliptically polarized, determine whether it is left-hand polarization or right-hand polarization according to the change relationship of the phase difference between the two signals, use the equipment to test the left-hand elliptically polarized signal, and record the relationship between the phase Φ1 and the phase Φ2 at this time, so as to determine the corresponding relationship between the phase difference change and the elliptical polarization;

[0008] Step 4: When the amplitudes of the two signals are the same, the phase difference between the two signals is determined. When the phase difference between the two signals remains basically unchanged, the signal is determined to be oblique polarization; if the phase difference (|Ф1-Ф2|) between the two signals fluctuates greatly, the signal is determined to be circular polarization;

[0009] Step 5: on the basis of determining that the signal is slant polarization, determine whether it is left slant polarization or right slant polarization according to the sign relationship of the phase difference (Φ1-Φ2) between the two signals, use the equipment to test the left slant polarization signal, and record the difference sign of the phase Φ1 and the phase Φ2 at this time, so as to determine the corresponding relationship between the phase difference sign and the slant polarization;

[0010] Step 6. On the basis of determining that the signal is circularly polarized, determine whether it is left-hand polarization or right-hand polarization according to the change relationship of the phase difference (Ф1-Ф2) between the two signals, use the equipment to test the right-hand circularly polarized signal, and record the difference change 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.

[0011] Compared with the prior art, the present invention has the following significant advantages, in addition to the features of using fewer antennas, simple implementation, small size, and light weight: 1) simple operation and use; 2) fast detection speed; 3) easy to carry or integrate with other systems. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0014] Figure 3 Polarization measurement flow chart.

[0015] Description of the accompanying drawings: first antenna 1, second antenna 2, receiving polarization test equipment 3, first radio frequency amplification frequency conversion filtering channel 31, second radio frequency amplification frequency conversion filtering channel 32, polarization measurement module 33, display module 34. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0017] like 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 test device 3, wherein the first antenna 1 and the second antenna 2 are connected to the receiving polarization test device 3 through radio frequency cables of equal amplitude and phase. The signal received by the first antenna 1 and the second antenna 2 enters the receiving polarization test device 3 to quickly detect the polarization characteristics of the received signal. The working frequency band of the first antenna 1 and the second antenna 2 should be consistent with the frequency of the measured signal, or should cover the frequency of the measured signal; the first antenna 1 and the second antenna 2 are linearly polarized antennas, and the two antenna polarizations are orthogonally installed together, 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 RF amplification frequency conversion filter channels (a first RF amplification frequency conversion filter channel 31 and a second RF amplification frequency conversion filter channel 32) with the same characteristics, a polarization measurement module 33 and a display module 34. The first RF amplification frequency conversion filter channel 31 and the second RF amplification frequency conversion filter channel 32 select the frequency of the received signal by frequency sweeping, and the two RF amplification frequency conversion filter channels use the same frequency sweeping source module for output. The operating frequency range of the RF amplification frequency conversion filter channel should cover the operating frequency of the measured signal.

[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 filtering channel, and completes the comparison processing of the two input signals in the program to achieve the measurement of the 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 the signal polarization characteristics, and can be an indicator light or a display screen, and can also be output through a communication interface.

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

[0022] The polarization characteristics are measured by measuring the amplitude (A1 and A2) and phase (Ф1 and Ф2) relationship of the signals received by the two channels to determine the signal polarization characteristics. Assume that the first antenna 1 is a horizontally polarized antenna, and the amplitude and phase of its signal are A1 and Ф1. The second antenna 2 is a vertically polarized antenna, and the amplitude and phase of its signal are A2 and Ф2.

[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 (when the output of one of the signals is almost zero and the difference in amplitude values 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 neither of the signals is 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-right relationship 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, when the difference in amplitude values 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 (when the phase difference is less than 10° it 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 varies greatly (for example, when the phase difference is greater than 10° it is considered to vary 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-right relationship 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-right relationship 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] Since then, by comparing the amplitude and phase characteristics of the signals received by the horizontally polarized and vertically polarized antennas, the polarization characteristics of the signal can be quickly determined. Although the measurement accuracy of this method is not high, its measurement speed is fast, the measurement method is simple, and the amount of equipment required is small. The equipment manufactured by this method is cheap and easy to carry.

[0030] Compared with the prior art, the present invention has the following significant advantages, in addition to the features of using fewer antennas, simple implementation, small size, and light weight: 1) simple operation and use; 2) fast detection speed; 3) easy to carry or integrate with other systems.

[0031] The present invention can be applied to signal polarization measurement and testing in various fields, such as signal detection and signal interference in the fields of electronic countermeasures, radar, and communications. The operation is simple, the measurement speed is fast, the size is small, the weight is light, and it is easy to carry or integrate with other equipment.

Claims

1. A portable signal polarization detection method, comprising 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 device, the amplitude and phase of the first antenna signal are A1, Φ1; the amplitude and phase of the second antenna signal are A2, Φ2, the first antenna and the second antenna are connected to the receiving polarization test device through a radio frequency cable with equal amplitude and phase; characterized in that: The operating frequency bands of the first antenna and the second antenna should be consistent with the measured signal frequency, or should cover the measured signal frequency; the first antenna and the second antenna are linearly polarized antennas, and the two antennas are installed together with orthogonal polarizations. 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, compare the amplitudes of the two signals. When the amplitudes of the two signals differ greatly, 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. Step 2: When the amplitudes of the two signals differ greatly, but any one of the signals is not zero, the signal is determined to be elliptical polarization; Step 3: On the basis of determining that the signal is elliptically polarized, determine whether it is left-hand polarization or right-hand polarization according to the change relationship of the phase difference between the two signals, use the equipment to test the left-hand elliptically polarized signal, and record the relationship between the phase Φ1 and the phase Φ2 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, the phase difference between the two signals is determined. When the phase difference between the two signals remains basically unchanged, the signal is determined to be oblique polarization; if the phase difference (|Ф1-Ф2|) between the two signals fluctuates greatly, the signal is determined to be circular polarization; Step 5: on the basis of determining that the signal is slant polarization, determine whether it is left slant polarization or right slant polarization according to the sign relationship of the phase difference (Φ1-Φ2) between the two signals, use the equipment to test the left slant polarization signal, and record the difference sign of the phase Φ1 and the phase Φ2 at this time, so as to determine the corresponding relationship between the phase difference sign and the slant polarization; Step 6. On the basis of determining that the signal is circularly polarized, determine whether it is left-hand polarization or right-hand polarization according to the change relationship of the phase difference (Ф1-Ф2) between the two signals, use the equipment to test the right-hand circularly polarized signal, and record the difference change 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. A portable signal polarization detection method according to claim 1, characterized in that: The receiving polarization test equipment includes two first RF amplifying frequency conversion filtering channels, a second RF amplifying frequency conversion filtering channel, a polarization measurement module and a display module with the same characteristics; the first RF amplifying frequency conversion filtering channel and the second RF amplifying frequency conversion filtering channel select the frequency of the received signal by frequency sweeping, and the two RF amplifying frequency conversion filtering channels use the same frequency sweeping source module for output; the operating frequency range of the RF amplifying frequency conversion filtering channel should cover the operating frequency of the measured signal.

3. A 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 RF amplification frequency conversion filtering channel, and completes the comparison processing of the two input signals in the program to realize the measurement of the signal polarization characteristics.

4. A portable signal polarization detection method according to claim 1, characterized in that: The display module in the receiving polarization test equipment is used to display 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 1, one output is zero, and the amplitude difference is more than 100 times, which is a large amplitude difference.

6. A portable signal polarization detection method according to claim 1 or 2, characterized in that: In step 4, if the amplitude difference is within the 10% range, the amplitudes are considered to be the same.

7. A portable signal polarization detection method according to claim 1 or 2, characterized in that: In step 4, if the phase difference is less than 10°, it is considered to remain unchanged.

8. A portable signal polarization detection method according to claim 1 or 2, characterized in that: In step 4, a phase difference greater than 10° is considered to be a large fluctuation.

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