Device, application and method for simulating antenna array radio frequency signal in Wattson-Watt direction finding system

Abstract

The invention belongs to the technical field of radio frequency communication, and particularly relates to a device, application and method for simulating antenna array radio frequency signals in a Wattson-Watt direction finding system, and the device comprises a first radio frequency switch, a power distribution unit, a phase control unit, an amplitude control unit and a plurality of second radio frequency switches which are connected in sequence. The first radio frequency switch is used for selecting corresponding signal channels for received radio frequency signals according to different frequency bands; the power distribution unit comprises a signal processing module and a signal decomposition module corresponding to each signal channel, and outputs radio frequency signals of an SN path, an EW path and a CR path; the phase control unit is used for performing phase control on the three paths of radio frequency signals respectively; the amplitude control unit is used for performing amplitude control on the three paths of radio frequency signals with required phases; the second radio frequency switch is used for outputting a radio frequency signal required by the directional machine and replaces a radio frequency circuit of an antenna array.

Description

Technical Field

[0001] The present invention belongs to the technical field of radio frequency communication, and in particular relates to a device, application and method for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system. Background Art

[0002] The Watson-Watt direction finding system is an amplitude comparison direction finding system that uses an Adcock antenna array to receive signals and a three-channel superheterodyne to receive analytical signals. Figure 1 As shown in the figure, it is the radiation pattern of the Adcock antenna array. N, S, E, and W are the four arrays of the antenna array, representing north, south, east, and west, and also representing 0°, 180°, 90°, and 270° of the antenna array. The shaded part in the middle is the radiation pattern of the received signal of the four antenna arrays. It can be seen that the antenna array has the strongest received signal strength in the four array directions, and when it deviates, the received signal strength decreases linearly. When the received signal strength of two adjacent antennas is the same, it is 45°, 135°, 225°, and 315° of the antenna array.

[0003] In the Watson-Watt direction finding system, the direction finder can calculate the incident angle of the RF input signal by receiving and analyzing the relative levels of the NS antenna pair and the EW antenna pair. However, the direction finder needs to receive the RF signal in an open space without any obstructions, which cannot be achieved in a laboratory. In other words, the direction finder cannot be tested in the laboratory. Therefore, it is necessary to design a device that simulates the RF signal output state of the antenna array in the Watson-Watt direction finding system to test the direction finder in the laboratory.

[0004] The above-mentioned direction finder is a three-channel direction finder based on the Watson-Watt amplitude ratio direction finding system.

[0005] In view of this, the inventor provides a device, application and method for simulating the radio frequency signal of an antenna array in a Watson-Watt direction finding system to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and propose a device, application and method for simulating the radio frequency signal of an antenna array in a Wattson-Watt direction finding system. The device includes a first radio frequency switch, a power distribution unit, a phase control unit, an amplitude control unit and a plurality of second radio frequency switches. The amplitude difference and phase difference of the radio frequency signals of each path are controlled by the phase control unit and the amplitude control unit, and the loss of the signal in the full frequency band is controlled by the power distribution unit to ensure the output of the radio frequency signal required by the direction finder, so as to realize the detection of a three-channel direction finder based on the Wattson-Watt amplitude ratio direction finding system.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] On the one hand, the present invention provides a device for simulating radio frequency signals of antenna arrays in a Wattson-Watt direction finding system, comprising a first radio frequency switch, a power distribution unit, a phase control unit, an amplitude control unit, and a plurality of second radio frequency switches connected in sequence;

[0009] The first radio frequency switch is used to select a corresponding signal channel for the received radio frequency signal according to different frequency bands;

[0010] The power distribution unit includes a signal processing module corresponding to each signal channel and a signal decomposition module connected to the signal processing module, and outputs the radio frequency signals of the SN path, the EW path and the CR path;

[0011] The phase control unit is used to perform phase control on the radio frequency signals of the SN path, the EW path and the CR path respectively, and output radio frequency signals of required phases;

[0012] The amplitude control unit is used to respectively control the amplitude of the radio frequency signals of the output required phases of the SN path, the EW path and the CR path, and output the radio frequency signals of the required amplitudes;

[0013] The second RF switch is used to output the processed and controlled RF signal of the SN path, EW path or CR path in the signal channel to the RF output interface connected thereto, and further output the RF signal required by the direction finder.

[0014] Furthermore, the signal channel includes a first signal channel with a frequency band of 80 MHz to 680 MHz and a second signal channel with a frequency band of 1600 MHz to 1680 MHz.

[0015] Furthermore, the signal processing unit corresponding to the first signal channel includes a first amplifier circuit and a first matching circuit connected to the first amplifier circuit, the signal decomposition module includes a first power divider, and the first matching circuit is connected to the first power divider; the signal processing unit corresponding to the second signal channel includes a second amplifier circuit and a second matching circuit connected to the second amplifier, the signal decomposition module includes a second power divider, and the second matching circuit is connected to the second power divider.

[0016] Furthermore, the phase control unit includes a plurality of third power dividers connected to the first power divider and a plurality of fourth power dividers connected to the second power divider, each of the third power dividers is correspondingly connected to a third RF switch; each of the fourth power dividers is correspondingly connected to a fourth RF switch.

[0017] Furthermore, the third power divider and the fourth power divider are both 1-to-2 power dividers, which are used to decompose the input radio frequency signal into two radio frequency signals with the same amplitude and opposite phases.

[0018] Further, the amplitude control unit includes a fifth RF switch connected to the third RF switch in a one-to-one correspondence and a sixth RF switch connected to the fourth RF switch in a one-to-one correspondence, and each of the fifth RF switch and each of the sixth RF switches is connected to the corresponding second RF switch.

[0019] On the other hand, the present invention also provides an application of the above-mentioned device in the detection of a three-channel direction finding machine based on a Watson-Watt ratio amplitude direction finding system.

[0020] In another aspect, the present invention further provides a method for detecting a direction finder of a Wattson-Watt direction finding system, based on the device for simulating the radio frequency signal of an antenna array in the Wattson-Watt direction finding system as described above, comprising the following steps:

[0021] Step 1: According to the form of the radio frequency signal output by the antenna array in the Watson-Watt direction finding system, a truth table containing a specific logic control relationship is obtained;

[0022] Step 2: constructing a device for simulating the radio frequency signal of the antenna array in the Watson-Watt direction finding system as described above based on the truth table;

[0023] Step 3, sending the radio frequency signal to the device in step 2, and outputting the radio frequency signal required for detecting the direction finder after being processed by the device;

[0024] Step 4: After receiving the required RF signal, the orienteering machine obtains the incident angle of the transmitted RF signal, and compares the incident angle with the incident angle of the RF signal sent in step 3 to obtain the detection result of the orienteering machine.

[0025] Furthermore, in step 2, the device is suitable for operating frequency bands of 80MHz to 680MHz and 1600MHz to 1680MHz.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention provides a device for simulating the radio frequency signal of the antenna array in the Wattson-Watt direction finding system, comprising a first radio frequency switch, a power distribution unit, a phase control unit, and an amplitude control unit. The amplitude difference and phase difference of the radio frequency signals of each path are controlled by all the power dividers and radio frequency switches in the phase control unit and the amplitude control unit. At the same time, the loss of the signal in the full frequency band is controlled by the amplification circuit and matching circuit of the power distribution unit to ensure the output of the radio frequency signal required by the direction finder. The device can simulate the radio frequency signal state output by the antenna array in the Wattson-Watt amplitude direction finding system, replace the radio frequency circuit of the Adcock antenna array, solve the problem that the direction finder cannot be detected in the laboratory, and the detection result is accurate and the effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 It is the directional pattern of Adcock antenna array in the prior art;

[0031] Figure 2 A schematic diagram of the structure of a device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system according to the present invention;

[0032] Figure 3 A circuit diagram of a power distribution unit of a device for simulating radio frequency signals of antenna arrays in a Wattson-Watt direction finding system according to the present invention;

[0033] Figure 4 The present invention is an 80MHz to 680MHz amplitude phase control circuit diagram of a device for simulating antenna array radio frequency signals in a Watson-Watt direction finding system;

[0034] Figure 5 A 1600MHz to 1680MHz amplitude and phase control circuit diagram of a device for simulating antenna array radio frequency signals in a Watson-Watt direction finding system of the present invention;

[0035] Figure 6 The output control circuit diagram of the device for simulating the radio frequency signal of the antenna array in the Watson-Watt direction finding system of the present invention.

[0036] Wherein: 1 is a power distribution unit; 2 is a phase control unit; 3 is an amplitude control unit; N1 is a first RF switch; N2 is a first RF amplifier; N3 is a second RF amplifier; N6 is a first power divider; N16 is a second power divider;

[0037] N7, N12, and N13 are the third power divider;

[0038] N17, N22, and N23 are the fourth power divider;

[0039] N9, N10, and N15 are fifth RF switches;

[0040] N19, N20, and N25 are sixth RF switches;

[0041] N8, N11, and N14 are third RF switches;

[0042] N26, N27, and N28 are second radio frequency switches;

[0043] C1 is the first capacitor; C2 is the second capacitor; C3 is the third capacitor; C4 is the fourth capacitor; C10 is the tenth capacitor;

[0044] XS4 is the first RF socket; XS3 is the second RF socket; XS5 is the third RF socket; XS6 is the fourth RF socket. DETAILED DESCRIPTION

[0045] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0046] See also Figure 2 to Figure 6 The present invention provides a device for simulating radio frequency signals of antenna arrays in a Wattson-Watt direction finding system, comprising a first radio frequency switch N1, a power distribution unit 1, a phase control unit 2, an amplitude control unit 3 and three second radio frequency switches (N26, N27, N28) connected in sequence;

[0047] The first RF switch N1 is used to select a corresponding signal channel for a received RF signal according to different frequency bands.

[0048] The power distribution unit 1 includes a signal processing module corresponding to each signal channel and a signal decomposition module connected to the signal processing module, each signal processing module amplifies, attenuates the amplitude and performs impedance matching on the input radio frequency signal, and each signal decomposition module is used to decompose the processed radio frequency signal and output the radio frequency signals of the SN path, EW path and CR path with the same frequency, amplitude and phase;

[0049] The phase control unit 2 is used to perform phase control on the radio frequency signals of the SN path, the EW path and the CR path respectively, and output radio frequency signals of the required phase;

[0050] The amplitude control unit 3 is used to respectively control the amplitude of the radio frequency signals of the output required phases of the SN path, the EW path and the CR path, and output the radio frequency signals of the required amplitudes;

[0051] The second RF switch is used to output the processed and controlled RF signal of the SN path, EW path or CR path in the signal channel to the RF output interface connected thereto, and then output the RF signal required by the direction finder. Figure 6As shown, specifically, the fifth RF switch N9 of the SN path of the first signal channel and the sixth RF switch N19 of the SN path of the second signal channel are both connected to the corresponding second RF switch N26, and output the RF signal of the first signal channel (fifth RF switch N9) or the second signal channel (sixth RF switch N19) through the second RF socket XS4; the fifth RF switch N10 of the EW path of the first signal channel and the sixth RF switch N20 of the EW path of the second signal channel are both connected to the corresponding second RF switch N27, and output the RF signal of the first signal channel (fifth RF switch N10) or the second signal channel (sixth RF switch N27) through the third RF socket XS5; the fifth RF switch N15 of the CR path of the first signal channel and the sixth RF switch N25 of the CR path of the second signal channel are both connected to the corresponding second RF switch N28, and output the RF signal of the first signal channel (fifth RF switch N15) or the second signal channel (sixth RF switch N25) through the fourth RF socket XS6. That is, if the first RF switch N1 selects the first signal channel, the signal of the first signal channel is output; if the first RF switch N1 selects the second signal channel, the signal of the second signal channel is output.

[0052] It should be noted that the first RF switch N1 is used to select a corresponding signal channel for the received RF signal according to different frequency bands, specifically, as follows: Figure 3 As shown, the RF signal is input to the RFC pin of the first RF switch N1 through the RF socket XS4. The first RF switch N1 has two RF output pins RF1 and RF2. By controlling the A and B pins, RFC-RF1 or RFC-RF2 can be turned on. Here, the RFC-RF1 path is a 1600MHz to 1680MHz signal path; the RFC-RF2 path is an 80MHz to 680MHz signal path. The channel selection is realized. In the 80MHz to 680MHz path.

[0053] In this embodiment, the signal channel includes a first signal channel with a frequency band of 80 MHz to 680 MHz and a second signal channel with a frequency band of 1600 MHz to 1680 MHz.

[0054] Further, the signal processing unit corresponding to the first signal channel includes a first amplifying circuit and a first matching circuit connected to the first amplifying circuit, the signal decomposition module includes a first power divider N6, the first matching circuit is connected to the first power divider N6, and the RF signal of the first signal channel is processed and decomposed respectively through the first amplifying circuit, the first matching circuit and the first power divider N6 in sequence;

[0055] The signal processing unit corresponding to the second signal channel includes a second amplifier circuit and a second matching circuit connected to the second amplifier. The signal decomposition module includes a second power divider N16. The second matching circuit is connected to the second power divider N16. The RF signal of the second signal channel is processed and decomposed respectively through the second amplifier circuit, the second matching circuit and the second power divider N16.

[0056] like Figure 3 As shown, the first amplifying circuit and the second amplifying circuit have the same structure, and only different types of low-noise radio frequency amplifiers are selected to ensure better amplitude flatness within the bandwidth.

[0057] Among them, the first amplification circuit includes a first RF amplifier N2 and a first capacitor C1, the input end of the first RF amplifier N2 is connected to the output end of the first capacitor C1, the output end of the first RF amplifier N2 is connected to the second capacitor C2, the third capacitor C3, the second RF amplifier N3 and the fourth capacitor C4 in sequence, and two LC circuits are connected in parallel between the output ends of the first RF amplifier N2 and the second RF amplifier N3. The LC circuit plays a role in power supply filtering and at the same time blocks the RF signal from being connected to the power supply.

[0058] It should be noted that the first RF amplifier N2 uses the PSA4-5043+ low-noise RF amplifier, which can ensure an amplification factor of 22dB to 25dB in the 80MHz to 680MHz frequency band. A total of 2 stages of amplification are used to ensure 40dB of amplification in the channel; the second RF amplifier N3 uses the TQP3M9008 low-noise RF amplifier, which can ensure an amplification factor of 22dB to 25dB in the 1600MHz to 1680MHz frequency band. A total of 2 stages of amplification are used to ensure 40dB of amplification in the channel to compensate for the signal power loss caused by the back-end power divider.

[0059] The first matching circuit and the second matching circuit have the same structure; the first matching circuit is at least one of a Π-type attenuation network, a resistance attenuation network or an LC filter network.

[0060] It should be noted that RC, LC or R form a Π-type attenuation network, which is used for attenuation of the RF signal amplitude, transformation of the front and rear impedances, and matching. In this embodiment, a Π-type attenuation network is selected (R1, R2, and R3 form a first matching circuit; R4, R5, and R6 form a second matching circuit). Figure 3 shown.

[0061] Furthermore, the phase control unit 2 includes three third power dividers (N7, N12, N13) connected to the first power divider N6 and three fourth power dividers (N17, N22, N23) connected to the second power divider N16, each third power divider is correspondingly connected to a third RF switch; each fourth power divider is correspondingly connected to a fourth RF switch.

[0062] Further, the amplitude control unit 3 includes a fifth RF switch connected to the third RF switch in one-to-one correspondence and a sixth RF switch connected to the fourth RF switch in one-to-one correspondence, and each fifth RF switch and each sixth RF switch are connected to the corresponding second RF switch (N26, N27, N28). The fifth RF switch (N9, N10, N15) and the sixth RF switch (N19, N20, N25) control the RF signal to the next level second RF switch (N26, N7, N28) or to the ground. The RF signal to the ground indicates that the signal is in no state at this time.

[0063] Specifically, Figure 4 As shown, the frequency 80MHz~680MHz amplitude phase control circuit. The first power divider N6 is a 1-to-3 power divider, and its input end is connected Figure 3 The fourth capacitor C4 in the circuit outputs three RF signals with the same amplitude, phase and frequency. They correspond to NS, EW and CR in the truth table respectively. Take the NS circuit as an example: the third power divider N7 (same as N12 and N13) is a 1-to-2 power divider. It divides the 1-channel signal into 2 channels with the same amplitude, frequency and phase difference of 180°. The third RF switch N8 (same as N11 and N14) has the same model. Figure 3 The first RF switch N1 in the figure. The switch is used in reverse here, with 2 inputs and 1 output selected. By selecting the reverse signal output by the power divider through the RF switch, the phase control in the truth table can be achieved. The fifth RF switch N9 (same as N10 and N15) is used in the same way Figure 3 The first RF switch N1 is 1-way input, and 1 of the 2-way output ports is selected for output. The amplitude control in the truth table is realized by the RF switch. Each output terminal is connected to a resistor π-type attenuation network to adjust the output amplitude of each channel to ensure the consistency of the amplitude of the three-way output signal.

[0064] Specifically, the first power divider N6 and the second power divider N16 are both 1-to-3 power dividers, and SRSC-4-63+ is selected.

[0065] The third power divider (N6, N11, N14) and the fourth power divider (N20, N26, N32) are both 1-to-2 power dividers, used to decompose the input RF signal into 2 RF signals with the same amplitude and opposite phase (0° / 180°). Specifically, the third power divider (N6, N11, N14) uses SYPJ-2-13+; the fourth power divider (N20, N26, N32) uses SYPJ-2-33.

[0066] like Figure 5 The following figure shows the amplitude and phase control circuit of the frequency range of 1600MHz to 1680MHz. Figure 3 The tenth capacitor C10 in the circuit structure principle is the same as Figure 4 Description. The difference lies in the selection of different 1-to-3 power splitters and 1-to-2 power splitters.

[0067] like Figure 6 The output control circuit is shown in FIG. It is composed of three second RF switches (N26, N27, and N28). It is used to control the output Figure 4 Three outputs from 80MHz to 680MHz or Figure 5 The control logic is the same as Figure 3 N1 in.

[0068] On the other hand, an embodiment of the present invention provides an application of the above-mentioned device in the detection of a three-channel direction finding machine based on a Watson-Watt amplitude ratio direction finding system.

[0069] On the other hand, an embodiment of the present invention further provides a method for detecting a direction finder of a Wattson-Watt direction finding system, based on the device for simulating the radio frequency signal of an antenna array in the Wattson-Watt direction finding system as described above, comprising the following steps:

[0070] Step 1: According to the form of the radio frequency signal output by the antenna array in the Watson-Watt direction finding system, a truth table containing a specific logic control relationship is obtained;

[0071] Step 2: constructing a device for simulating the radio frequency signal of the antenna array in the Watson-Watt direction finding system as described above based on the truth table;

[0072] Step 3, sending the radio frequency signal to the device in step 2, and outputting the radio frequency signal required for detecting the direction finder after being processed by the device;

[0073] Step 4: After receiving the required RF signal, the orienteering machine obtains the incident angle of the transmitted RF signal (the incident angle is obtained based on the truth table), and compares the incident angle with the incident angle of the RF signal sent in step 3 to obtain the detection result of the orienteering machine.

[0074] Specifically, in step 1, the truth table is shown in Table 1 below:

[0075] Table 1 contains the truth table of specific logic control relationship

[0076]

[0077] Table 1 shows the logic control relationship, which is used to control the transmission routes of the RF signal in the three channels of SN, EW and CR.

[0078] 1) Output eight states: Make the output RF signal represent 8 angles, including 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315°.

[0079] 2) CR is the reference signal, and its amplitude and phase remain unchanged; NS and EW signals are controlled according to the logic in the above table.

[0080] 3) Amplitude control has two states: 0dBc means that the signal output has no attenuation compared to the reference signal (CR signal); ≤-30dBc means that the signal output has an attenuation of more than 30dB compared to the reference signal (CR signal).

[0081] The phase control has two states: 0° represents that the difference between the signal phase and the reference signal (CR signal) is 0°, and 180° represents that the difference between the signal phase and the reference signal (CR signal) is 180°.

[0082] By demodulating the above-mentioned output RF signal through a direction finder, 8 directions can be demodulated, including 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°, which are the typical test angles of the direction finder during equipment testing.

[0083] Furthermore, in step 2, the device is suitable for operating frequency bands of 80MHz to 680MHz and 1600MHz to 1680MHz.

[0084] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0085] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system, characterized in that: It comprises a first radio frequency switch, a power distribution unit (1), a phase control unit (2), an amplitude control unit (3) and a plurality of second radio frequency switches which are connected in sequence; The first radio frequency switch is used to select a corresponding signal channel for the received radio frequency signal according to different frequency bands; The power distribution unit (1) comprises a signal processing module corresponding to each signal channel and a signal decomposition module connected to the signal processing module, and outputs radio frequency signals of the SN path, the EW path and the CR path; The phase control unit (2) is used to perform phase control on the radio frequency signals of the SN path, the EW path and the CR path respectively, and output radio frequency signals of required phases; The amplitude control unit (3) is used to respectively control the amplitude of the radio frequency signals of the output required phases of the SN path, the EW path and the CR path, and output radio frequency signals of the required amplitudes; The second RF switch is used to output the processed and controlled RF signal of the SN path, EW path or CR path in the signal channel to the RF output interface connected thereto, and further output the RF signal required by the direction finder.

2. The device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system according to claim 1, characterized in that: The signal channel includes a first signal channel with a frequency band of 80 MHz to 680 MHz and a second signal channel with a frequency band of 1600 MHz to 1680 MHz.

3. The device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system according to claim 2, characterized in that: The signal processing unit corresponding to the first signal channel includes a first amplifier circuit and a first matching circuit connected to the first amplifier circuit, and the signal decomposition module includes a first power divider, and the first matching circuit is connected to the first power divider; the signal processing unit corresponding to the second signal channel includes a second amplifier circuit and a second matching circuit connected to the second amplifier, and the signal decomposition module includes a second power divider, and the second matching circuit is connected to the second power divider.

4. The device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system according to claim 3, characterized in that: The phase control unit (2) comprises a plurality of third power dividers connected to the first power divider and a plurality of fourth power dividers connected to the second power divider, each of the third power dividers is correspondingly connected to a third radio frequency switch; each of the fourth power dividers is correspondingly connected to a fourth radio frequency switch.

5. The device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system according to claim 4, characterized in that: The third power divider and the fourth power divider are both 1-to-2 power dividers, which are used to decompose the input radio frequency signal into two radio frequency signals with the same amplitude and opposite phases.

6. The device for simulating radio frequency signals of antenna arrays in a Watson-Watt direction finding system according to claim 4, characterized in that: The amplitude control unit (3) comprises a fifth radio frequency switch connected to the third radio frequency switch in a one-to-one correspondence and a sixth radio frequency switch connected to the fourth radio frequency switch in a one-to-one correspondence, and each of the fifth radio frequency switches and each of the sixth radio frequency switches are connected to the corresponding second radio frequency switch.

7. Application of the device according to any one of claims 1 to 6 in the detection of a three-channel direction finding machine based on a Watson-Watt ratio amplitude direction finding system.

8. A detection method for a direction finder of a Wattson-Watt direction finding system, characterized in that: The device for simulating the radio frequency signal of the antenna array in the Wattson-Watt direction finding system according to any one of claims 1 to 6 comprises the following steps: Step 1: According to the form of the radio frequency signal output by the antenna array in the Watson-Watt direction finding system, a truth table containing a specific logic control relationship is obtained; Step 2: constructing a device for simulating the radio frequency signal of an antenna array in a Watson-Watt direction finding system according to any one of claims 1 to 6 based on the truth table; Step 3, sending the radio frequency signal to the device in step 2, and outputting the radio frequency signal required for detecting the direction finder after being processed by the device; Step 4: After receiving the required RF signal, the orienteering machine obtains the incident angle of the transmitted RF signal, and compares the incident angle with the incident angle of the RF signal sent in step 3 to obtain the detection result of the orienteering machine.

9. The detection method for the direction finder of the Wattson-Watt direction finding system according to claim 8, characterized in that: In step 2, the device is suitable for operating frequency bands of 80MHz to 680MHz and 1600MHz to 1680MHz.

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