Radio astronomical receiver phase detection method and device

Abstract

The invention discloses a phase detection method and device for a radio astronomical receiver, and relates to the technical field of radio astronomical receivers, and the device comprises an intermediate frequency signal obtaining module, an intermediate frequency signal preprocessing module and a phase detection module which are connected in sequence. The intermediate frequency signal acquisition module is used for acquiring a signal in the radio astronomical receiver before entering the terminal as an initial signal; the intermediate-frequency signal preprocessing module is used for preprocessing the initial signal to obtain an intermediate-frequency signal; the phase detection module is used for performing phase detection on the intermediate frequency signal. According to the application, the phase detection module is arranged to detect the phase stability of the astronomical observation signal before the astronomical observation signal enters the terminal, so that the reliability of the astronomical observation data is improved.

Description

Technical Field

[0001] The present application relates to the technical field of radio astronomy receivers, and in particular to a phase detection method and device for a radio astronomy receiver. Background Art

[0002] The phase stability of radio astronomy receivers is one of the important factors to ensure the validity of observation data, especially in very long baseline interferometry (VLBI) observations. Phase stability is extremely important. Phase instability will lead to the inability to produce coherent fringes, and the observation data cannot be used at this time. In order to ensure the smooth progress of the experiment and the validity of the data, multiple types of tests need to be performed on the receiver before the experiment to ensure the stability and reliability of the system. Phase detection is one of them. From the radio telescope to the receiver, from the cable to the terminal, each part may affect the phase. Therefore, a phase detection system is urgently needed to perform phase detection on the signal before it enters the terminal, observe the stability of the signal phase in real time before or during the experiment, and provide users with reliable astronomical observation data. Summary of the invention

[0003] The purpose of this application is to provide a phase detection method and device for a radio astronomy receiver, which can detect the phase stability of astronomical observation signals before they enter the terminal, thereby improving the reliability of astronomical observation data.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a phase detection device for a radio astronomy receiver, comprising: an intermediate frequency signal acquisition module, an intermediate frequency signal preprocessing module, and a phase detection module connected in sequence;

[0006] The intermediate frequency signal acquisition module is used to acquire the signal before entering the terminal in the radio astronomy receiver as the initial signal;

[0007] The intermediate frequency signal preprocessing module is used to preprocess the initial signal to obtain an intermediate frequency signal;

[0008] The phase detection module is used to perform phase detection on the intermediate frequency signal.

[0009] Optionally, the intermediate frequency signal acquisition module includes:

[0010] A first feed source, a first Dewar module, a first signal processor, a second signal processor, a first power divider, a first coupler, a phase corrector, and a first noise source;

[0011] The first noise source is connected to a first end of a main line of the first coupler;

[0012] The phase corrector is connected to the secondary circuit of the first coupler;

[0013] The second end of the main line of the first coupler is connected to the input end of the first power divider;

[0014] The first output end of the first power divider is connected to the first end of the first Dewar module;

[0015] The second output end of the first power divider is connected to the second end of the first Dewar module;

[0016] The third end of the first Dewar module and the fourth end of the first Dewar module are both connected to the first feed source;

[0017] The fifth terminal of the first Dewar module is connected to the input terminal of the first signal processor;

[0018] The sixth end of the first Dewar module is connected to the input end of the second signal processor;

[0019] The output end of the first signal processor and the output end of the second signal processor are both connected to the intermediate frequency signal preprocessing module.

[0020] Optionally, the intermediate frequency signal acquisition module includes:

[0021] A second feed source, a second Dewar module, a third signal processor, a fourth signal processor, a second power divider, a second coupler, a first signal generator, and a second noise source;

[0022] The second noise source is connected to a first end of a main line of the second coupler;

[0023] The first signal generator is connected to a secondary circuit of the second coupler;

[0024] The second end of the main line of the second coupler is connected to the input end of the second power divider;

[0025] The first output end of the second power divider is connected to the first end of the second Dewar module;

[0026] The second output end of the second power divider is connected to the second end of the second Dewar module;

[0027] The third end of the second Dewar module and the fourth end of the second Dewar module are both connected to the second feed source;

[0028] The fifth terminal of the second Dewar module is connected to the input terminal of the third signal processor;

[0029] The sixth end of the second Dewar module is connected to the input end of the fourth signal processor;

[0030] The output end of the third signal processor and the output end of the fourth signal processor are both connected to the intermediate frequency signal preprocessing module.

[0031] Optionally, the intermediate frequency signal acquisition module includes:

[0032] A third feed source, a third Dewar module, a fifth signal processor, a sixth signal processor, a second signal generator and a calibration unit;

[0033] The calibration unit is connected to the first end of the third Dewar module and the second end of the third Dewar module;

[0034] The third end of the third Dewar module and the fourth end of the third Dewar module are both connected to the third feed source;

[0035] The second signal generator is connected to a radiating antenna of a radio astronomy receiver; the radiating antenna of the radio astronomy receiver acts on the third feed source;

[0036] The fifth end of the third Dewar module is connected to the input end of the fifth signal processor;

[0037] The sixth end of the third Dewar module is connected to the input end of the sixth signal processor;

[0038] The output end of the fifth signal processor and the output end of the sixth signal processor are both connected to the intermediate frequency signal preprocessing module.

[0039] Optionally, the Dewar module is a second Dewar module, a second Dewar module, or a second Dewar module;

[0040] The Dewar module includes:

[0041] a third coupler, a fourth coupler, a first low noise amplifier, and a second low noise amplifier;

[0042] The secondary circuit of the third coupler serves as the first end of the Dewar module;

[0043] The secondary circuit of the fourth coupler serves as the second end of the Dewar module;

[0044] The first end of the main line of the third coupler serves as the third end of the Dewar module;

[0045] The first end of the main line of the fourth coupler serves as the fourth end of the Dewar module;

[0046] The second end of the main line of the third coupler is connected to the input end of the first low noise amplifier;

[0047] The output end of the first low noise amplifier serves as the fifth end of the Dewar module;

[0048] The second end of the main line of the fourth coupler is connected to the input end of the second low noise amplifier;

[0049] The output end of the second low noise amplifier serves as the sixth end of the Dewar module.

[0050] Optionally, the intermediate frequency signal preprocessing module includes:

[0051] a first amplifier, a first mixer, a first filter and a first local oscillator;

[0052] The first input end of the first mixer is connected to the output end of the first amplifier; the input end of the first amplifier is connected to the intermediate frequency signal acquisition module;

[0053] The second input end of the first mixer is connected to the output end of the first local oscillator; the input end of the first local oscillator is used to input a reference signal;

[0054] The output end of the first mixer is connected to the input end of the first filter; the output end of the first filter is connected to the phase detection module.

[0055] Optionally, the phase detection module includes:

[0056] a third power divider, a first programmable attenuator, a second amplifier, a first capacitor, a third amplifier, a second capacitor, a second programmable attenuator, a fourth amplifier, a second mixer, a second filter, a second local oscillator, a phase detector, an analog-to-digital converter, a controller, an oscilloscope, and a detector;

[0057] The first input end of the third power divider is connected to the output end of the first filter;

[0058] The second input end of the third power divider is connected to the detector;

[0059] The output end of the third power divider is connected to the input end of the first programmable attenuator;

[0060] The output end of the first programmable attenuator is connected to the input end of the second amplifier;

[0061] The output end of the second amplifier is connected to the first end of the first capacitor;

[0062] The second end of the first capacitor is connected to the input end of the third amplifier;

[0063] The output end of the third amplifier is connected to the first end of the second capacitor;

[0064] The second end of the second capacitor is connected to the input end of the second programmable attenuator;

[0065] The output end of the second programmable attenuator is connected to the input end of the fourth amplifier;

[0066] The output terminal of the fourth amplifier is connected to the first input terminal of the second mixer;

[0067] The second input terminal of the second mixer is connected to the second local oscillator;

[0068] An output terminal of the second mixer is connected to an input terminal of the second filter;

[0069] The output terminal of the second filter is connected to the first input terminal of the phase detector;

[0070] The second input terminal of the phase detector is used to input a reference signal;

[0071] The output end of the phase detector is connected to the input end of the analog-to-digital converter;

[0072] The output end of the analog-to-digital converter is connected to the input end of the controller;

[0073] The controller is also connected to the oscilloscope, the detector, the first programmable attenuator and the second programmable attenuator respectively; the controller is used to determine the phase of the intermediate frequency signal based on the phase detector output voltage and the phase detector output voltage-phase difference correspondence.

[0074] Optionally, the amplitude of the reference signal is the same as the amplitude of the initial signal.

[0075] In a second aspect, the present application provides a radio astronomy receiver phase detection method. Optionally, the radio astronomy receiver phase detection method is applied to the radio astronomy receiver phase detection device. The radio astronomy receiver phase detection method includes:

[0076] The signal before entering the terminal in the radio astronomy receiver is obtained as the initial signal;

[0077] Preprocessing the initial signal to obtain an intermediate frequency signal;

[0078] Based on the corresponding relationship between the phase detector output voltage and the phase difference, the phase detection result of the intermediate frequency signal is determined.

[0079] Optionally, before acquiring the signal before entering the terminal in the radio astronomy receiver as the initial signal, the method further includes:

[0080] Construct the phase detector output voltage-phase difference correspondence.

[0081] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0082] The present application provides a phase detection method and device for a radio astronomy receiver. The intermediate frequency signal acquisition module injects a known signal (i.e., an initial signal) from the front end of the receiver, and the intermediate frequency signal preprocessing module filters, amplifies, divides power, mixes, and performs gain control processing on the initial signal, and outputs an intermediate frequency signal. The phase detection module passes the extracted signal (i.e., the intermediate frequency signal) through a programmable attenuator and a power divider, and is divided into two paths, one of which enters the signal correlation processing module, and the other passes through a detector for power intensity detection. The programmable attenuator is adjusted by detecting the size so that the signal is within a suitable intensity range. The other signal comes from the 10MHz of a hydrogen atomic clock. The two signals are correlated and directly output to a phase device of two signals, which are collected and recorded by the control processing module. The phase stability of the astronomical observation signal can be detected before the astronomical observation signal enters the terminal, thereby improving the reliability of the astronomical observation data. The device has a simple calculation process, low cost, and can be implemented without a particularly complex algorithm. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0084] Figure 1 This is a module diagram of a phase detection device for a radio astronomy receiver in one embodiment of the present application;

[0085] Figure 2 This is a circuit diagram of a first implementation mode of an intermediate frequency signal acquisition module in an embodiment of the present application;

[0086] Figure 3 This is a circuit diagram of a second implementation mode of the intermediate frequency signal acquisition module in one embodiment of the present application;

[0087] Figure 4 This is a circuit diagram of a third implementation mode of the intermediate frequency signal acquisition module in one embodiment of the present application;

[0088] Figure 5 This is a circuit diagram of an intermediate frequency signal preprocessing module in an embodiment of the present application;

[0089] Figure 6 This is a circuit diagram of a first implementation method of a phase detection module in an embodiment of the present application;

[0090] Figure 7This is a circuit diagram of a second implementation method of a phase detection module in an embodiment of the present application;

[0091] Figure 8 This is a diagram showing the corresponding relationship between the phase detector output voltage and the phase difference in one embodiment of the present application;

[0092] Fig. 9 This is a schematic diagram of the detection result when the signal phase difference is 0° in one embodiment of the present application;

[0093] Fig.10 This is a schematic diagram of the detection result when the signal phase difference is 45° in one embodiment of the present application;

[0094] Fig.11 This is a schematic diagram of the detection result when the signal phase difference is 90° in one embodiment of the present application;

[0095] Fig.12 This is a schematic diagram of the detection result when the signal phase difference is 135° in one embodiment of the present application;

[0096] Fig.13 This is a schematic diagram of the detection result when the signal phase difference is 180° in one embodiment of the present application;

[0097] Fig.14 This is a schematic diagram of the detection result when the signal phase difference is 225° in one embodiment of the present application;

[0098] Fig.15 This is a schematic diagram of the detection result when the signal phase difference is 270° in one embodiment of the present application;

[0099] Fig.16 This is a schematic diagram of the detection result when the signal phase difference is 315° in one embodiment of the present application;

[0100] Fig.17 This is a schematic diagram of the detection results when the signal phase difference is 360° in one embodiment of the present application. DETAILED DESCRIPTION

[0101] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0102] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0103] In an exemplary embodiment, Figure 1As shown, a phase detection device for a radio astronomy receiver is provided, comprising: an intermediate frequency signal acquisition module, an intermediate frequency signal preprocessing module and a phase detection module connected in sequence. The intermediate frequency signal acquisition module is used to obtain the signal before entering the terminal in the radio astronomy receiver as an initial signal. The intermediate frequency signal preprocessing module is used to preprocess the initial signal to obtain an intermediate frequency signal. The phase detection module is used to perform phase detection on the intermediate frequency signal.

[0104] The intermediate frequency signal acquisition module injects a known signal (the frequency range and strength are suitable for the receiver) from the front end of the receiver. The known signal can be the phase calibration signal of the receiver ( Figure 2 ), or a signal is coupled into the noise injection port ( Figure 3 ), or by radiating from a feed / antenna, injecting a signal from the receiver feed ( Figure 4 ), after the injection signal is processed by the receiver (filtering, amplification, mixing, etc.), it can be detected from the intermediate frequency signal 1 and intermediate frequency signal 2 output ports.

[0105] like Figure 2 The intermediate frequency signal acquisition module includes: a first feed source, a first Dewar module, a first signal processor, a second signal processor, a first power divider, a first coupler, a phase corrector and a first noise source.

[0106] The first noise source is connected to the first end of the main line of the first coupler.

[0107] The phase corrector is connected to the secondary line of the first coupler.

[0108] The second end of the main line of the first coupler is connected to the input end of the first power divider.

[0109] The first output end of the first power divider is connected to the first end of the first Dewar module.

[0110] The second output end of the first power divider is connected to the second end of the first Dewar module.

[0111] The third end of the first Dewar module and the fourth end of the first Dewar module are both connected to the first feed source.

[0112] The fifth terminal of the first Dewar module is connected to the input terminal of the first signal processor.

[0113] The sixth terminal of the first Dewar module is connected to the input terminal of the second signal processor.

[0114] The output end of the first signal processor and the output end of the second signal processor are both connected to the intermediate frequency signal preprocessing module.

[0115] like Figure 3The intermediate frequency signal acquisition module includes: a second feed source, a second Dewar module, a third signal processor, a fourth signal processor, a second power divider, a second coupler, a first signal generator and a second noise source.

[0116] The second noise source is connected to the first end of the main line of the second coupler.

[0117] The first signal generator is connected to the secondary line of the second coupler.

[0118] The second end of the main line of the second coupler is connected to the input end of the second power divider.

[0119] The first output end of the second power divider is connected to the first end of the second Dewar module.

[0120] The second output end of the second power divider is connected to the second end of the second Dewar module.

[0121] The third end of the second Dewar module and the fourth end of the second Dewar module are both connected to the second feed source.

[0122] The fifth terminal of the second Dewar module is connected to the input terminal of the third signal processor.

[0123] The sixth terminal of the second Dewar module is connected to the input terminal of the fourth signal processor.

[0124] The output end of the third signal processor and the output end of the fourth signal processor are both connected to the intermediate frequency signal preprocessing module.

[0125] like Figure 4 The intermediate frequency signal acquisition module includes: a third feed source, a third Dewar module, a fifth signal processor, a sixth signal processor, a second signal generator and a calibration unit.

[0126] The calibration unit is connected to the first end of the third Dewar module and the second end of the third Dewar module.

[0127] The third end of the third Dewar module and the fourth end of the third Dewar module are both connected to the third feed source.

[0128] The second signal generator is connected to the radiating antenna of the radio astronomy receiver. The radiating antenna of the radio astronomy receiver acts on the third feed source.

[0129] The fifth terminal of the third Dewar module is connected to the input terminal of the fifth signal processor.

[0130] The sixth terminal of the third Dewar module is connected to the input terminal of the sixth signal processor.

[0131] The output end of the fifth signal processor and the output end of the sixth signal processor are both connected to the intermediate frequency signal preprocessing module.

[0132] The Dewar module is a second Dewar module, a second Dewar module or a second Dewar module. The Dewar module includes: a third coupler, a fourth coupler, a first low noise amplifier and a second low noise amplifier.

[0133] The secondary line of the third coupler serves as the first end of the Dewar module.

[0134] The secondary line of the fourth coupler serves as the second end of the Dewar module.

[0135] The first end of the main line of the third coupler serves as the third end of the Dewar module.

[0136] The first end of the main line of the fourth coupler serves as the fourth end of the Dewar module.

[0137] The second end of the main line of the third coupler is connected to the input end of the first low noise amplifier.

[0138] The output terminal of the first low noise amplifier serves as the fifth terminal of the Dewar module.

[0139] The second end of the main line of the fourth coupler is connected to the input end of the second low noise amplifier.

[0140] The output terminal of the second low noise amplifier serves as the sixth terminal of the Dewar module.

[0141] like Figure 5 The intermediate frequency signal preprocessing module extracts the injected known signal from the intermediate frequency signal 1 or the intermediate frequency signal 2 through filtering, amplification, power division, mixing, gain control, etc. The intermediate frequency signal preprocessing module includes: a first amplifier, a first mixer, a first filter and a first local oscillator.

[0142] The first input end of the first mixer is connected to the output end of the first amplifier. The input end of the first amplifier is connected to the intermediate frequency signal acquisition module.

[0143] The second input terminal of the first mixer is connected to the output terminal of the first local oscillator. The input terminal of the first local oscillator is used to input a reference signal. The amplitude of the reference signal is the same as the amplitude of the initial signal.

[0144] The output end of the first mixer is connected to the input end of the first filter. The output end of the first filter is connected to the phase detection module.

[0145] like Figure 6The phase detection module extracts the signal through a programmable attenuator and a power divider and divides it into two paths. One path of the signal enters the signal correlation processing module, and the other path passes through a detector for power intensity detection. The programmable attenuator is adjusted by detecting the size to make the signal within the appropriate intensity range. The other signal entering the signal correlation processing module comes from the 10MHz of the hydrogen atomic clock. After the two signals are correlated, the phase detector directly outputs the two signals, which are collected and recorded by the control processing module.

[0146] As another implementation of the phase detection module, Figure 7 , the phase detection module includes:

[0147] The third power divider D1, the first programmable attenuator ATT1, the second amplifier AMP1, the first capacitor C1, the third amplifier AMP2, the second capacitor C2, the second programmable attenuator ATT2, the fourth amplifier AMP3, the second mixer MIX, the second filter BPF, the second local oscillator LO, the phase detector (Phase Detecto), the analog-to-digital converter ADC), the controller (MCU), the oscilloscope (curve) and the detector (TTP).

[0148] The first input end of the third power divider is connected to the output end of the first filter.

[0149] The second input end of the third power divider is connected to the detector.

[0150] The output end of the third power divider is connected to the input end of the first programmable attenuator.

[0151] The output end of the first programmable attenuator is connected to the input end of the second amplifier.

[0152] The output terminal of the second amplifier is connected to the first terminal of the first capacitor.

[0153] The second end of the first capacitor is connected to the input end of the third amplifier.

[0154] The output terminal of the third amplifier is connected to the first terminal of the second capacitor.

[0155] The second end of the second capacitor is connected to the input end of the second programmable attenuator.

[0156] The output end of the second programmable attenuator is connected to the input end of the fourth amplifier.

[0157] An output terminal of the fourth amplifier is connected to a first input terminal of the second mixer.

[0158] The second input terminal of the second mixer is connected to the second local oscillator.

[0159] The output terminal of the second mixer is connected to the input terminal of the second filter.

[0160] An output terminal of the second filter is connected to a first input terminal of the phase detector.

[0161] The second input terminal of the phase detector is used to input a reference signal.

[0162] The output terminal of the phase detector is connected to the input terminal of the analog-to-digital converter.

[0163] The output terminal of the analog-to-digital converter is connected to the input terminal of the controller.

[0164] The controller is also connected to the oscilloscope, the detector, the first programmable attenuator and the second programmable attenuator respectively. The controller is used to determine the phase of the intermediate frequency signal based on the output voltage of the phase detector and the corresponding relationship between the output voltage of the phase detector and the phase difference.

[0165] like Figure 7 In this embodiment, the known signal injected into the receiver is extracted through the intermediate frequency, and the extracted frequency range is 100MHz-600MHz. Figure 7 The known intermediate frequency signal is divided by the power divider D1, and the power strength of the signal is adjusted by the programmable attenuator ATTn and the amplifier AMPn. The signal is then mixed to 10MHz by the local oscillator LO and the mixer MIX. The 10MHz signal f1 is then filtered out by the bandpass filter BPF. Finally, the signal f1 and the 10MHz reference signal f2 of the hydrogen atomic clock are simultaneously input into the phase detector. Before detection, the amplitudes of the signals f1 and f2 need to be adjusted to be consistent. The input of the detector TTP is measured by the MCU, and ATTn is controlled to achieve the same amplitude of the signal f1 as that of the signal f2. Then the output voltage of the phase detector is measured by the MCU. Figure 8 The phase difference between the signal f1 and the signal f2 is determined by the phase detector output voltage-phase difference correspondence. Figure 8 The horizontal axis represents the difference between the two phases, and the vertical axis represents the voltage value corresponding to the phase difference, that is, 10mV / ℃, which can accurately measure the phase difference between two identical equal-amplitude signals between 0-180 degrees. In the measurement circuit, the phase detector can use a dual-pass oscilloscope to measure the phase difference between signal f1 and signal f2, such as Figure 9-Figure 17 As shown, the graphs are when the phase difference between the two signals is 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360° respectively. Figure 9-Figure 17 In the figure, the horizontal axis represents time, the vertical axis represents the voltage value corresponding to the phase difference, Signal 1 represents signal f1, and Signal 2 represents signal f2.

[0166] Before the measurement, the system was calibrated. Since the system itself has certain errors, two standard 10MHz signals were introduced to replace f1 and f2, one of which was fixed, and the amplitude of the other signal was adjusted by the phase adjuster in 1° steps to obtain the calibration function of each interval in the range of 0°-180°. The corresponding relationship between the calibration interval and the function is shown in Table 1.

[0167] Table 1 Correspondence between calibration interval and function

[0168] Range / degree function -180 to 178 <h2 style=";text-align:left;direction:ltr"><![CDATA[y=-5.6579x <h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +117.23x-784.64]]><h2 style=";text-align:left;direction:ltr"> -177 to 175 <![CDATA[y=-0.0183x 2 +0.9011x-185.21]]> -174 to 171 <h2 style=";text-align:left;direction:ltr"><![CDATA[y=-0.0018x <h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +0.2529x-178.73]]><h2 style=";text-align:left;direction:ltr"> -171 to 130 y=0.0959x-174.9 -130 to 7 y=0.0929x-173.1 -6：0 y=0.0515x-98.417

[0169] In an exemplary embodiment, a radio astronomy receiver phase detection method is provided. The radio astronomy receiver phase detection method is applied to the radio astronomy receiver phase detection device. The radio astronomy receiver phase detection method includes:

[0170] Step 1: Construct the phase detector output voltage-phase difference correspondence.

[0171] Step 2: The signal before entering the terminal in the radio astronomy receiver is obtained as the initial signal.

[0172] Step 3: Preprocess the initial signal to obtain the intermediate frequency signal.

[0173] Step 4: Based on the phase detector output voltage-phase difference correspondence, determine the phase detection result of the intermediate frequency signal.

[0174] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the device and its core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A phase detection device for a radio astronomy receiver, characterized in that: include: An intermediate frequency signal acquisition module, an intermediate frequency signal preprocessing module and a phase detection module connected in sequence; The intermediate frequency signal acquisition module is used to acquire the signal before entering the terminal in the radio astronomy receiver as the initial signal; The intermediate frequency signal preprocessing module is used to preprocess the initial signal to obtain an intermediate frequency signal; The phase detection module is used to perform phase detection on the intermediate frequency signal.

2. The phase detection device for a radio astronomy receiver according to claim 1, characterized in that: The intermediate frequency signal acquisition module comprises: A first feed source, a first Dewar module, a first signal processor, a second signal processor, a first power divider, a first coupler, a phase corrector, and a first noise source; The first noise source is connected to a first end of a main line of the first coupler; The phase corrector is connected to the secondary circuit of the first coupler; The second end of the main line of the first coupler is connected to the input end of the first power divider; The first output end of the first power divider is connected to the first end of the first Dewar module; The second output end of the first power divider is connected to the second end of the first Dewar module; The third end of the first Dewar module and the fourth end of the first Dewar module are both connected to the first feed source; The fifth terminal of the first Dewar module is connected to the input terminal of the first signal processor; The sixth end of the first Dewar module is connected to the input end of the second signal processor; The output end of the first signal processor and the output end of the second signal processor are both connected to the intermediate frequency signal preprocessing module.

3. The phase detection device for a radio astronomy receiver according to claim 1, characterized in that: The intermediate frequency signal acquisition module comprises: A second feed source, a second Dewar module, a third signal processor, a fourth signal processor, a second power divider, a second coupler, a first signal generator, and a second noise source; The second noise source is connected to a first end of a main line of the second coupler; The first signal generator is connected to a secondary circuit of the second coupler; The second end of the main line of the second coupler is connected to the input end of the second power divider; The first output end of the second power divider is connected to the first end of the second Dewar module; The second output end of the second power divider is connected to the second end of the second Dewar module; The third end of the second Dewar module and the fourth end of the second Dewar module are both connected to the second feed source; The fifth terminal of the second Dewar module is connected to the input terminal of the third signal processor; The sixth end of the second Dewar module is connected to the input end of the fourth signal processor; The output end of the third signal processor and the output end of the fourth signal processor are both connected to the intermediate frequency signal preprocessing module.

4. The phase detection device for a radio astronomy receiver according to claim 1, characterized in that: The intermediate frequency signal acquisition module comprises: A third feed source, a third Dewar module, a fifth signal processor, a sixth signal processor, a second signal generator and a calibration unit; The calibration unit is connected to the first end of the third Dewar module and the second end of the third Dewar module; The third end of the third Dewar module and the fourth end of the third Dewar module are both connected to the third feed source; The second signal generator is connected to a radiating antenna of a radio astronomy receiver; the radiating antenna of the radio astronomy receiver acts on the third feed source; The fifth end of the third Dewar module is connected to the input end of the fifth signal processor; The sixth end of the third Dewar module is connected to the input end of the sixth signal processor; The output end of the fifth signal processor and the output end of the sixth signal processor are both connected to the intermediate frequency signal preprocessing module.

5. The phase detection device for a radio astronomy receiver according to any one of claims 2 to 4, characterized in that: The Dewar module is a second Dewar module, a second Dewar module or a second Dewar module; The Dewar module includes: a third coupler, a fourth coupler, a first low noise amplifier, and a second low noise amplifier; The secondary circuit of the third coupler serves as the first end of the Dewar module; The secondary circuit of the fourth coupler serves as the second end of the Dewar module; The first end of the main line of the third coupler serves as the third end of the Dewar module; The first end of the main line of the fourth coupler serves as the fourth end of the Dewar module; The second end of the main line of the third coupler is connected to the input end of the first low noise amplifier; The output end of the first low noise amplifier serves as the fifth end of the Dewar module; The second end of the main line of the fourth coupler is connected to the input end of the second low noise amplifier; The output end of the second low noise amplifier serves as the sixth end of the Dewar module.

6. The phase detection device for a radio astronomy receiver according to claim 1, characterized in that: The intermediate frequency signal preprocessing module comprises: a first amplifier, a first mixer, a first filter and a first local oscillator; The first input end of the first mixer is connected to the output end of the first amplifier; the input end of the first amplifier is connected to the intermediate frequency signal acquisition module; The second input end of the first mixer is connected to the output end of the first local oscillator; the input end of the first local oscillator is used to input a reference signal; The output end of the first mixer is connected to the input end of the first filter; the output end of the first filter is connected to the phase detection module.

7. The phase detection device for a radio astronomy receiver according to claim 6, characterized in that: The phase detection module comprises: a third power divider, a first programmable attenuator, a second amplifier, a first capacitor, a third amplifier, a second capacitor, a second programmable attenuator, a fourth amplifier, a second mixer, a second filter, a second local oscillator, a phase detector, an analog-to-digital converter, a controller, an oscilloscope, and a detector; The first input end of the third power divider is connected to the output end of the first filter; The second input end of the third power divider is connected to the detector; The output end of the third power divider is connected to the input end of the first programmable attenuator; The output end of the first programmable attenuator is connected to the input end of the second amplifier; The output end of the second amplifier is connected to the first end of the first capacitor; The second end of the first capacitor is connected to the input end of the third amplifier; The output end of the third amplifier is connected to the first end of the second capacitor; The second end of the second capacitor is connected to the input end of the second programmable attenuator; The output end of the second programmable attenuator is connected to the input end of the fourth amplifier; The output terminal of the fourth amplifier is connected to the first input terminal of the second mixer; The second input terminal of the second mixer is connected to the second local oscillator; An output terminal of the second mixer is connected to an input terminal of the second filter; The output terminal of the second filter is connected to the first input terminal of the phase detector; The second input terminal of the phase detector is used to input a reference signal; The output end of the phase detector is connected to the input end of the analog-to-digital converter; The output end of the analog-to-digital converter is connected to the input end of the controller; The controller is also connected to the oscilloscope, the detector, the first programmable attenuator and the second programmable attenuator respectively; the controller is used to determine the phase of the intermediate frequency signal based on the phase detector output voltage and the phase detector output voltage-phase difference correspondence.

8. The phase detection device for a radio astronomy receiver according to claim 7, characterized in that: The amplitude of the reference signal is the same as the amplitude of the initial signal.

9. A phase detection method for a radio astronomy receiver, characterized in that: The radio astronomy receiver phase detection method is applied to the radio astronomy receiver phase detection device according to any one of claims 1 to 8, and the radio astronomy receiver phase detection method comprises: The signal before entering the terminal in the radio astronomy receiver is obtained as the initial signal; Preprocessing the initial signal to obtain an intermediate frequency signal; Based on the corresponding relationship between the phase detector output voltage and the phase difference, the phase detection result of the intermediate frequency signal is determined.

10. The phase detection method for a radio astronomy receiver according to claim 9, characterized in that: Before obtaining the signal before entering the terminal in the radio astronomy receiver as the initial signal, it also includes: Construct the phase detector output voltage-phase difference correspondence.

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