A phase-sensitive detection-based heading and attitude correction signal detection circuit

Abstract

The utility model discloses a kind of navigation attitude correction signal detection circuit based on phase-sensitive detection, it is related to electronic communication field, including multiple phase-sensitive detection circuit and an analog-digital conversion unit, analog-digital conversion unit includes multiple input interfaces, respectively with multiple phase-sensitive detection circuit connection;Phase-sensitive detection circuit is used to receive the navigation attitude correction signal of input, phase-sensitive detection and waveform output, analog-digital conversion unit is used to collect the amplitude and phase of each phase-sensitive detection circuit input signal;Phase-sensitive detection circuit includes the half-wave detection circuit and the detection output circuit connected in turn, half-wave detection circuit is used to receive reference signal and navigation attitude correction signal, and the navigation attitude correction signal of input is carried out half-wave detection, detection output circuit is used to follow and filter to the signal of input, and conversion is carried out to direct current signal and is output.The utility model is based on phase-sensitive detection and carries out the detection of navigation attitude correction signal amplitude and phase, and significantly improves anti-interference ability.

Description

Technical Field

[0001] This utility model relates to the field of electronic communications, and in particular to a flight attitude correction signal detection circuit based on phase-sensitive detection. Background Technology

[0002] Attitude correction signal detection is a core technology in aviation, aerospace, and maritime fields, ensuring the accuracy of carrier attitude control. Its core function is to acquire weak electrical signals that reflect carrier attitude deviations in real time and convert them into standard signals that can be recognized by the attitude control system, ultimately achieving dynamic correction of the carrier's attitude. The sensitivity, anti-interference capability, and stability of attitude correction signal detection determine the overall performance of carrier attitude control.

[0003] Current attitude correction signal detection technologies mainly rely on traditional envelope detection methods, ordinary amplification and filtering, or simple digital signal processing schemes. However, these existing schemes exhibit poor anti-interference performance, low signal extraction efficiency, and insufficient stability in practical applications. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a phase-sensitive detection circuit for attitude correction signals, which can efficiently identify the amplitude and phase of the correction signal while improving anti-interference capability.

[0005] The objective of this utility model is achieved through the following technical solution: An attitude correction signal detection circuit based on phase-sensitive detection includes multiple phase-sensitive detection circuits and an analog-to-digital converter (ADC). The ADC includes multiple input interfaces, which are respectively connected to the multiple phase-sensitive detection circuits. The phase-sensitive detection circuits are used to receive, perform phase-sensitive detection, and output waveforms of the input attitude correction signals. The ADC is used to acquire the amplitude and phase of the input signals of each phase-sensitive detection circuit. The phase-sensitive detection circuit includes a half-wave detection circuit and a detection output circuit connected in sequence. The half-wave detection circuit is used to receive a reference signal and an attitude correction signal, and to perform half-wave detection on the input attitude correction signal. The detection output circuit is used to follow and filter the input signal, and convert it into a DC signal for output.

[0006] Furthermore, the half-wave detection circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a diode D1, and a transistor Q1. One end of the first resistor R1 is connected to one end of the second resistor R2 and the collector of the transistor Q1, and the other end of the first resistor R1 is grounded; the other end of the second resistor R2 is connected to the attitude correction signal input terminal; one end of the third resistor R3 is connected to the reference signal input terminal, and the other end of the third resistor R3 is connected to the anode of the diode D1 and one end of the sixth resistor R6; the cathode of the diode D1 is connected to one end of the eighth resistor R8 and the base of the transistor Q1, and the emitter of the transistor Q1 is connected to one end of the ninth resistor R9 and one end of the seventh resistor R7, and the other ends of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all grounded.

[0007] Furthermore, the detector output circuit includes a first operational amplifier IC1, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a second operational amplifier IC2, a tenth resistor R10, and an eleventh resistor R11. The positive input terminal of the first operational amplifier IC1 is connected to the emitter of the transistor Q1. The inverting input terminal and the output terminal of the first operational amplifier IC1 are connected. The output terminal of the first operational amplifier IC1 is also connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the positive input terminal of the second operational amplifier IC2 and one end of the second capacitor C2 through the fifth resistor R5. One end of the first capacitor C1 is connected to the junction of the fourth resistor R4 and the fifth resistor R5. One end of the first capacitor C1 is connected to the output terminal of the second operational amplifier IC2. The output terminal of the second operational amplifier IC2 is also connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to one end of the tenth resistor R10 and the inverting input terminal of the second operational amplifier IC2. The other end of the tenth resistor R10 is grounded.

[0008] Furthermore, the analog-to-digital conversion unit includes an analog-to-digital converter of model MAX1300, which provides eight independent channels for receiving single-ended attitude correction signals output by the phase-sensitive detection circuit.

[0009] Furthermore, the attitude correction signal comes from the attitude computer and includes horizontal correction, lateral correction, pitch servo output, tilt follow-up output, and fast / slow magnetic correction signal. The attitude correction signal is a square wave with a frequency of 400Hz. The reference signal is a sinusoidal AC signal with an amplitude of 26V and a frequency of 400Hz.

[0010] The beneficial effects of this utility model are: This invention provides a phase-sensitive detection circuit for attitude correction signals, which has the ability to identify the phase of the modulated signal and select the frequency, enabling the detection of the amplitude and phase of the attitude correction signal. Specifically, the phase-sensitive detection circuit multiplies the signal to be detected with a standard reference signal, converting only the target signal with the same phase into a low-frequency component that can be extracted by a low-pass filter. Out-of-phase interference is converted into a high-frequency component after the multiplication operation and is completely filtered out by the low-pass filter, achieving efficient filtering of irrelevant interference. Furthermore, the detection circuit provided by this invention effectively reduces debugging difficulty and further optimizes costs. Attached Figure Description

[0011] Figure 1 A circuit diagram of the phase-sensitive detector circuit provided in an embodiment of this utility model; Figure 2 The circuit diagram of the analog-to-digital conversion unit provided in this embodiment of the utility model. Detailed Implementation

[0012] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0013] See Figures 1-2 This utility model provides a technical solution: An attitude correction signal detection circuit based on phase-sensitive detection includes multiple phase-sensitive detection circuits and an analog-to-digital converter (ADC). The ADC includes multiple input interfaces, which are respectively connected to the multiple phase-sensitive detection circuits. The phase-sensitive detection circuits are used to receive, perform phase-sensitive detection, and output waveforms of the input attitude correction signals. The ADC is used to acquire the amplitude and phase of the input signals of each phase-sensitive detection circuit. The phase-sensitive detection circuit includes a half-wave detection circuit and a detection output circuit connected in sequence. The half-wave detection circuit is used to receive a reference signal and an attitude correction signal, and to perform half-wave detection on the input attitude correction signal. The detection output circuit is used to follow and filter the input signal, and convert it into a DC signal for output.

[0014] The attitude correction signal comes from the attitude computer and includes horizontal correction, lateral correction, pitch servo output, tilt follow-up output, and fast and slow magnetic correction signals. The attitude correction signal is a square wave with a frequency of 400Hz. The reference signal is a sinusoidal AC signal with an amplitude of 26V and a frequency of 400Hz.

[0015] like Figure 1As shown, the half-wave detection circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a diode D1, and a transistor Q1. One end of the first resistor R1 is connected to one end of the second resistor R2 and the collector of the transistor Q1, and the other end of the first resistor R1 is grounded; the other end of the second resistor R2 is connected to the attitude correction signal input terminal; one end of the third resistor R3 is connected to the reference signal input terminal, and the other end of the third resistor R3 is connected to the anode of the diode D1 and one end of the sixth resistor R6; the cathode of the diode D1 is connected to one end of the eighth resistor R8 and the base of the transistor Q1, and the emitter of the transistor Q1 is connected to one end of the ninth resistor R9 and one end of the seventh resistor R7, and the other ends of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all grounded.

[0016] In the half-wave detection circuit, resistors R1 and R2 are voltage divider resistors for the input attitude correction signal, resistors R3 and R6 are voltage divider resistors for the input reference signal, R8 is a pull-down resistor, diode D1 is connected to the base of transistor Q1, enabling transistor Q1 to form a half-wave detector; resistor R7 is connected to the emitter of transistor Q1, enabling the output signal of transistor Q1 to carry a load, thus stabilizing the output signal of Q1.

[0017] like Figure 1 As shown, the detector output circuit includes a first operational amplifier IC1, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a second operational amplifier IC2, a tenth resistor R10, and an eleventh resistor R11. The positive input terminal of the first operational amplifier IC1 is connected to the emitter of the transistor Q1. The inverting input terminal and the output terminal of the first operational amplifier IC1 are connected. The output terminal of the first operational amplifier IC1 is also connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the positive input terminal of the second operational amplifier IC2 and one end of the second capacitor C2 through the fifth resistor R5. One end of the first capacitor C1 is connected to the junction of the fourth resistor R4 and the fifth resistor R5. One end of the first capacitor C1 is connected to the output terminal of the second operational amplifier IC2. The output terminal of the second operational amplifier IC2 is also connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to one end of the tenth resistor R10 and the inverting input terminal of the second operational amplifier IC2. The other end of the tenth resistor R10 is grounded.

[0018] Operational amplifier IC1 functions as a follower, increasing input impedance and decreasing output impedance. The RC structure of resistors R4 and R5, capacitors C1 and C2 forms a second-order low-pass filter, enabling low-pass filtering of the input signal. The first capacitor C1, operational amplifier IC2, resistors R10 and R11 form an integrator circuit, which integrates the input signal to output a DC signal. When the amplitude or phase of the input attitude correction signal changes, the output of operational amplifier IC2 will change accordingly; when the attitude correction signal reverses, the output of IC2 also reverses.

[0019] The core idea of ​​the aforementioned phase-sensitive detector circuit is to multiply the input signal with a reference signal, filter out high-frequency components using a low-pass filter, and retain the low-frequency components. These low-frequency components contain information about the original baseband signal, and their sign depends on the phase difference between the input and reference signals. By multiplying and filtering the input signal to be detected with a reference signal of known phase, phase-sensitive detection can not only reconstruct the amplitude of the signal to be detected but also reflect the phase relationship between the signal to be detected and the reference signal through the sign of the output signal.

[0020] In this embodiment, the analog-to-digital conversion unit includes an analog-to-digital converter of model MAX1300, which provides eight independent channels (CH0-CH7) for receiving single-ended attitude correction signals output by the phase-sensitive detection circuit.

[0021] The output voltage of operational amplifier IC2 is input to the analog-to-digital converter (ADC). A microprocessor can read the output voltage of IC2 and, using appropriate weights, calculate the voltage and phase of the portion of the signal that needs to be acquired. The specific schematic diagram of the ADC unit is shown below. Figure 2 As shown, the analog-to-digital converter (MAX1300) uses an independent 8-channel phase-sensitive detector circuit to process multiple correction signals of the attitude system. Specifically, it can be applied to output testing of attitude system outputs such as horizontal correction, lateral correction, pitch servo output, tilt follow-up output, and fast and slow magnetic correction.

[0022] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A phase-sensitive detection-based attitude correction signal detection circuit, characterized in that: It includes a multi-channel phase-sensitive detector circuit and an analog-to-digital converter (ADC). The ADC includes multiple input interfaces, which are respectively connected to the multi-channel phase-sensitive detector circuit. The phase-sensitive detector circuit is used to receive, phase-sensitively detect, and output waveforms of the input attitude correction signals. The ADC is used to acquire the amplitude and phase of the input signals of each phase-sensitive detector circuit. The phase-sensitive detection circuit includes a half-wave detection circuit and a detection output circuit connected in sequence. The half-wave detection circuit is used to receive a reference signal and an attitude correction signal, and to perform half-wave detection on the input attitude correction signal. The detection output circuit is used to follow and filter the input signal, and convert it into a DC signal for output.

2. The attitude correction signal detection circuit based on phase-sensitive detection according to claim 1, characterized in that: The half-wave detection circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a diode D1, and a transistor Q1. One end of the first resistor R1 is connected to one end of the second resistor R2 and the collector of the transistor Q1, and the other end of the first resistor R1 is grounded; the other end of the second resistor R2 is connected to the attitude correction signal input terminal; one end of the third resistor R3 is connected to the reference signal input terminal, and the other end of the third resistor R3 is connected to the anode of the diode D1 and one end of the sixth resistor R6; the cathode of the diode D1 is connected to one end of the eighth resistor R8 and the base of the transistor Q1, and the emitter of the transistor Q1 is connected to one end of the ninth resistor R9 and one end of the seventh resistor R7, and the other ends of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all grounded.

3. The attitude correction signal detection circuit based on phase-sensitive detection according to claim 2, characterized in that: The detector output circuit includes a first operational amplifier IC1, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a second operational amplifier IC2, a tenth resistor R10, and an eleventh resistor R11. The positive input terminal of the first operational amplifier IC1 is connected to the emitter of the transistor Q1. The inverting input terminal and the output terminal of the first operational amplifier IC1 are connected. The output terminal of the first operational amplifier IC1 is also connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the positive input terminal of the second operational amplifier IC2 and one end of the second capacitor C2 through the fifth resistor R5. One end of the first capacitor C1 is connected to the junction of the fourth resistor R4 and the fifth resistor R5. One end of the first capacitor C1 is connected to the output terminal of the second operational amplifier IC2. The output terminal of the second operational amplifier IC2 is also connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is connected to one end of the tenth resistor R10 and the inverting input terminal of the second operational amplifier IC2. The other end of the tenth resistor R10 is grounded.

4. The attitude correction signal detection circuit based on phase-sensitive detection according to claim 1, characterized in that: The analog-to-digital conversion unit includes a MAX1300 analog-to-digital converter, which provides eight independent channels for receiving single-ended attitude correction signals output by the phase-sensitive detection circuit.

5. The attitude correction signal detection circuit based on phase-sensitive detection according to claim 1, characterized in that: The attitude correction signal comes from the attitude computer and includes horizontal correction, lateral correction, pitch servo output, tilt follow-up output, and fast and slow magnetic correction signals. The attitude correction signal is a square wave with a frequency of 400Hz. The reference signal is a sinusoidal AC signal with an amplitude of 26V and a frequency of 400Hz.

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