Satellite navigation anti-interference signal enhancer

Abstract

The utility model relates to the technical field of satellite navigation, in particular to a satellite navigation anti-interference signal intensifier, which comprises a receiving antenna, a prefilter, a fixed amplification module and an automatic gain module which are sequentially connected, the output end of the fixed amplification module is further connected with a control module, and the control module comprises a peak value detection unit and a switch control unit. Two output ends of the switch control unit are connected with a control end of the automatic gain module, the peak detection unit is used for detecting a signal peak value, and the switch control unit controls the amplification factor of the automatic gain module based on the signal peak value output by the peak detection unit. According to the utility model, the prefilter is used for filtering interference signals, then the peak value detection unit is used for judging the magnitude of the signals, and then the switch control unit is used for selecting different resistors, so that the amplification factor of the automatic gain module is changed, the signals are enhanced, the final signals are in a proper range, subsequent signal processing is facilitated, and the practicability is higher.

Description

Technical Field

[0001] This utility model relates to the field of satellite navigation technology, and more specifically, to a satellite navigation anti-interference signal enhancer. Background Technology

[0002] In modern society, satellite navigation systems have become an indispensable infrastructure, widely used in many fields, including transportation, surveying and mapping, geographic information, military, and mobile communications.

[0003] Satellite navigation signals are susceptible to various interferences during transmission. First, there is natural interference, as satellite signals undergo refraction, delay, and attenuation when passing through the ionosphere and troposphere, affecting signal quality and accuracy. Second, when satellite signals encounter obstacles during propagation, multipath propagation phenomena such as reflection and scattering occur, resulting in the receiver receiving multiple signal copies that interfere with each other and degrade signal quality. There is also human interference; malicious attackers may use jamming devices to deliberately emit jamming signals, and unintentional emissions from some electronic devices may also interfere with satellite navigation signals.

[0004] Therefore, given the importance of satellite navigation systems and the severity of interference problems, a satellite navigation anti-interference signal enhancer is needed to meet the requirements. Utility Model Content

[0005] The purpose of this invention is to provide a satellite navigation anti-interference signal enhancer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A satellite navigation anti-interference signal enhancer includes a receiving antenna, a pre-filter, a fixed amplification module, and an automatic gain control module connected in sequence. The output of the fixed amplification module is also connected to a control module. The control module includes a peak detection unit and a switch control unit. The input of the peak detection unit is connected to the output of the fixed amplification module, and the input of the switch control unit is connected to the output of the peak detection unit. The two outputs of the switch control unit are connected to the control terminals of the automatic gain control module. The peak detection unit is used to detect the signal peak value, and the switch control unit controls the amplification factor of the automatic gain control module based on the signal peak value output by the peak detection unit.

[0008] Preferably, the pre-filter includes a high-pass filter unit and a low-pass filter unit connected in sequence.

[0009] Preferably, the fixed amplification module includes resistor R1, operational amplifier U1, resistor R2, and resistor R3;

[0010] The first end of resistor R1 serves as the input terminal of the fixed amplification module, the second end of resistor R1 is connected to the non-inverting input terminal of operational amplifier U1, the first end of resistor R2 is connected to the output terminal of operational amplifier U1, the second end of resistor R2 is connected to the inverting input terminal of operational amplifier U1, the first end of resistor R3 is connected to the second end of resistor R2, the second end of resistor R3 is grounded, and the output terminal of operational amplifier U1 serves as the output terminal of the fixed amplification module.

[0011] Preferably, the peak detection unit includes a diode D1, a capacitor C, and a resistor R4;

[0012] The positive terminal of diode D1 serves as the input terminal of the peak detection unit, and the negative terminal of diode D1 serves as the output terminal of the peak detection unit. The first terminal of capacitor C is connected to the negative terminal of diode D1, and the second terminal of capacitor C is grounded. The first terminal of resistor R4 is connected to the negative terminal of diode D1, and the second terminal of resistor R4 is grounded.

[0013] Preferably, the switch control unit includes a power supply VCC, resistors R5, R6, R7, R8, R9, and an LM2903 chip.

[0014] The first end of resistor R5 serves as the input terminal of the switch control unit. The second end of resistor R5 is connected to both the IN1+ and IN2+ pins of the LM2903 chip. The first end of resistor R6 is connected to the power supply VCC. The second end of resistor R6 is connected to the first end of resistor R7, and the second end of resistor R7 is grounded. The IN1- pin of the LM2903 chip is connected to the second end of resistor R6. The first end of resistor R8 is connected to the power supply VCC. The second end of resistor R8 is connected to the first end of resistor R9, and the second end of resistor R9 is grounded. The IN2- pin of the LM2903 chip is connected to the second end of resistor R8. The OUT1 and OUT2 pins of the LM2903 chip serve as the two output terminals of the switch control unit.

[0015] Preferably, the automatic gain control module includes a CD4052 chip, resistors R10, R11, R12, and R13, operational amplifier U2, resistors R14 and R15, and operational amplifier U3.

[0016] Pin 1Z of the CD4052 chip serves as the input terminal of the automatic gain control module. Pins S1 and S2 of the CD4052 chip serve as the control terminals of the automatic gain control module. The first terminal of resistor R10 is connected to pin 1Y0 of the CD4052 chip, the first terminal of resistor R11 is connected to pin 1Y2 of the CD4052 chip, and the first terminal of resistor R12 is connected to pin 1Y3 of the CD4052 chip. The second terminals of resistors R10, R11, and R12 are all connected to the inverting input terminal of operational amplifier U2. The second terminal of resistor R13 is connected to the inverting input terminal of operational amplifier U2. One end of resistor R13 is connected to the inverting input of operational amplifier U2, the second end of resistor R13 is connected to the output of operational amplifier U2, the non-inverting input of operational amplifier U2 is grounded, the output of operational amplifier U2 is connected to the first end of resistor R14, the second end of resistor R14 is connected to the inverting input of operational amplifier U3, the first end of resistor R15 is connected to the inverting input of operational amplifier U3, the second end of resistor R15 is connected to the output of operational amplifier U3, the non-inverting input of operational amplifier U3 is grounded, and the output of operational amplifier U3 serves as the output of the automatic gain module.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention filters out interference signals by setting a pre-filter, determines the signal magnitude by a peak detection unit, and then selects different resistors by a switch control unit to change the amplification factor of the automatic gain module. This enhances the signal while keeping the final signal within a suitable range, facilitating subsequent signal processing and making it more practical. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the pre-filter structure in the utility model;

[0021] Figure 3 This is a circuit diagram of the fixed amplification module in the utility model.

[0022] Figure 4 This is a circuit diagram of the peak detection unit in the utility model.

[0023] Figure 5 This is a circuit diagram of the switch control unit in the utility model.

[0024] Figure 6 This is a circuit diagram of the automatic gain module in the utility model.

[0025] In the picture:

[0026] 1. Receiving antenna;

[0027] 2. Pre-filter; 20. High-pass filter unit; 21. Low-pass filter unit;

[0028] 3. Fixed amplification module;

[0029] 4. Control module; 40. Peak detection unit; 41. Switch control unit;

[0030] 5. Automatic gain control module. Detailed Implementation

[0031] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0032] Please see Figures 1-6 The present invention provides the following technical solution:

[0033] The satellite navigation anti-interference signal enhancer includes a receiving antenna 1, a pre-filter 2, a fixed amplification module 3, and an automatic gain control module 5 connected in sequence. The output of the fixed amplification module 3 is also connected to a control module 4. The control module 4 includes a peak detection unit 40 and a switch control unit 41. The input of the peak detection unit 40 is connected to the output of the fixed amplification module 3, and the input of the switch control unit 41 is connected to the output of the peak detection unit 40. The two outputs of the switch control unit 41 are connected to the control terminals of the automatic gain control module 5. The peak detection unit 40 is used to detect the signal peak value. The switch control unit 41 controls the amplification factor of the automatic gain control module 5 based on the signal peak value output by the peak detection unit 40. The pre-filter 2 plays a role in anti-interference. The automatic gain control module 5 enhances the signal while amplifying it to a suitable range, which is convenient for subsequent signal processing and has greater practicality.

[0034] In this embodiment, the pre-filter 2 includes a high-pass filter unit 20 and a low-pass filter unit 21 connected in sequence. The cutoff frequencies of the high-pass filter unit 20 and the low-pass filter unit 21 need to be determined according to the frequency of the satellite navigation signal.

[0035] Specifically, the fixed amplification module 3 includes resistor R1, operational amplifier U1, resistor R2 and resistor R3, which are used for preliminary amplification. The signals received by satellite navigation are usually very small and need to be amplified.

[0036] The first end of resistor R1 serves as the input terminal of fixed amplifier module 3, the second end of resistor R1 is connected to the non-inverting input terminal of operational amplifier U1, the first end of resistor R2 is connected to the output terminal of operational amplifier U1, the second end of resistor R2 is connected to the inverting input terminal of operational amplifier U1, the first end of resistor R3 is connected to the second end of resistor R2, the second end of resistor R3 is grounded, and the output terminal of operational amplifier U1 serves as the output terminal of fixed amplifier module 3.

[0037] Furthermore, the peak detection unit 40 includes a diode D1, a capacitor C, and a resistor R4. The signal will continuously charge the capacitor C until the capacitor C reaches the peak value of the signal, and the peak detection unit 40 will eventually output the peak value of the signal.

[0038] The positive terminal of diode D1 serves as the input terminal of peak detection unit 40, and the negative terminal of diode D1 serves as the output terminal of peak detection unit 40. The first terminal of capacitor C is connected to the negative terminal of diode D1, and the second terminal of capacitor C is grounded. The first terminal of resistor R4 is connected to the negative terminal of diode D1, and the second terminal of resistor R4 is grounded.

[0039] It is worth noting that the switch control unit 41 includes power supply VCC, resistors R5, R6, R7, R8, R9 and LM2903 chip. The branches containing resistors R6 and R7, and the branches containing resistors R8 and R9 are used to form two thresholds respectively. The signal peak value is compared with the two thresholds respectively, and two signals are output. The two signals are either high-level signals or low-level signals.

[0040] The first end of resistor R5 serves as the input terminal of the switch control unit 41. The second end of resistor R5 is connected to both the IN1+ and IN2+ pins of the LM2903 chip. The first end of resistor R6 is connected to the power supply VCC. The second end of resistor R6 is connected to the first end of resistor R7, and the second end of resistor R7 is grounded. The IN1- pin of the LM2903 chip is connected to the second end of resistor R6. The first end of resistor R8 is connected to the power supply VCC. The second end of resistor R8 is connected to the first end of resistor R9, and the second end of resistor R9 is grounded. The IN2- pin of the LM2903 chip is connected to the second end of resistor R8. The OUT1 and OUT2 pins of the LM2903 chip serve as the two output terminals of the switch control unit 41.

[0041] It is worth noting that the automatic gain module 5 includes a CD4052 chip, resistors R10, R11, R12, and R13, operational amplifier U2, resistors R14 and R15, and operational amplifier U3. The automatic gain module 5 determines the switching status of the CD4052 chip based on the two signals output by the switch control unit 41, and then selects different resistors to be connected to the circuit to control the amplification factor.

[0042] Pin 1Z of the CD4052 chip serves as the input terminal of the automatic gain control module 5. Pins S1 and S2 of the CD4052 chip serve as the control terminals of the automatic gain control module 5. The first end of resistor R10 is connected to pin 1Y0 of the CD4052 chip, the first end of resistor R11 is connected to pin 1Y2 of the CD4052 chip, and the first end of resistor R12 is connected to pin 1Y3 of the CD4052 chip. The second ends of resistors R10, R11, and R12 are all connected to the inverting input terminal of operational amplifier U2. The second end of resistor R13... One end of resistor R13 is connected to the inverting input of operational amplifier U2, the second end of resistor R13 is connected to the output of operational amplifier U2, the non-inverting input of operational amplifier U2 is grounded, the output of operational amplifier U2 is connected to the first end of resistor R14, the second end of resistor R14 is connected to the inverting input of operational amplifier U3, the first end of resistor R15 is connected to the inverting input of operational amplifier U3, the second end of resistor R15 is connected to the output of operational amplifier U3, the non-inverting input of operational amplifier U3 is grounded, and the output of operational amplifier U3 serves as the output of automatic gain module 5.

[0043] When the satellite navigation anti-interference signal enhancer of this utility model is in use, after the receiving antenna 1 receives the signal, the signal passes through the high-pass filter unit 20 and the low-pass filter unit 21 in sequence, and the interference signal is filtered out in sequence. Then, the fixed amplification module 3 can initially amplify the signal. Then, the signal will charge the capacitor C in the peak detection unit 40. When the voltage on the capacitor C reaches the signal peak, the peak detection unit 40 outputs the signal peak. The switch control unit 41 compares the signal peak with two thresholds and outputs the comparison result through the OUT1 and OUT2 pins. The branches containing resistors R6 and R7, and the branches containing resistors R8 and R9 are used to form the two thresholds respectively. The two output terminals of the switch control unit 41 control the switch in the CD4052 chip, thereby selecting different resistors and changing the amplification factor of the automatic gain module 5. While enhancing the signal, it also amplifies the signal to a suitable range, which is convenient for subsequent signal processing and has stronger practicality.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A satellite navigation anti-interference signal enhancer, comprising a receiving antenna (1), a pre-filter (2), a fixed amplification module (3) and an automatic gain module (5) connected in sequence, characterized in that: The output end of the fixed amplification module (3) is also connected with a control module (4), the control module (4) comprises a peak value detection unit (40) and a switch control unit (41), the input end of the peak value detection unit (40) is connected with the output end of the fixed amplification module (3), the input end of the switch control unit (41) is connected with the output end of the peak value detection unit (40), the two output ends of the switch control unit (41) are connected with the control end of the automatic gain module (5), the peak value detection unit (40) is used for detecting a signal peak value, and the switch control unit (41) controls the amplification multiple of the automatic gain module (5) based on the signal peak value output by the peak value detection unit (40).

2. The satellite navigation anti-jam signal booster of claim 1, wherein: The pre-filter (2) comprises a high-pass filter unit (20) and a low-pass filter unit (21) connected in sequence.

3. The satellite navigation anti-jam signal booster of claim 1, wherein: The fixed amplification module (3) comprises a resistor R1, an operational amplifier U1, a resistor R2 and a resistor R3. The first end of the resistor R1 is used as the input end of the fixed amplification module (3), the second end of the resistor R1 is connected with the non-inverting input end of the operational amplifier U1, the first end of the resistor R2 is connected with the output end of the operational amplifier U1, the second end of the resistor R2 is connected with the inverting input end of the operational amplifier U1, the first end of the resistor R3 is connected with the second end of the resistor R2, the second end of the resistor R3 is connected with the ground, and the output end of the operational amplifier U1 is used as the output end of the fixed amplification module (3).

4. The satellite navigation anti-jam signal booster of claim 1, wherein: The peak value detection unit (40) comprises a diode D1, a capacitor C and a resistor R4. The anode of the diode D1 is used as the input end of the peak value detection unit (40), the cathode of the diode D1 is used as the output end of the peak value detection unit (40), the first end of the capacitor C is connected with the cathode of the diode D1, the second end of the capacitor C is connected with the ground, the first end of the resistor R4 is connected with the cathode of the diode D1, and the second end of the resistor R4 is connected with the ground.

5. The satellite navigation anti-jam signal booster of claim 1, wherein: The switch control unit (41) comprises a power supply VCC, resistors R5, R6, R7, R8, R9 and an LM2903 chip. The first end of the resistor R5 is used as the input end of the switch control unit (41), the second end of the resistor R5 is connected with the IN1+ pin and the IN2+ pin of the LM2903 chip, the first end of the resistor R6 is connected with the power supply VCC, the second end of the resistor R6 is connected with the first end of the resistor R7, the second end of the resistor R7 is connected with the ground, the IN1- pin of the LM2903 chip is connected with the second end of the resistor R6, the first end of the resistor R8 is connected with the power supply VCC, the second end of the resistor R8 is connected with the first end of the resistor R9, the second end of the resistor R9 is connected with the ground, the IN2- pin of the LM2903 chip is connected with the second end of the resistor R8, and the OUT1 pin and the OUT2 pin of the LM2903 chip are used as the two output ends of the switch control unit (41).

6. The satellite navigation anti-jam signal booster of claim 1, wherein: The automatic gain module (5) comprises a CD4052 chip, resistors R10, R11, R12, R13, an operational amplifier U2, resistors R14, R15 and an operational amplifier U3. The 1Z pin of the CD4052 chip is connected to the input end of the automatic gain module (5), the S1 pin and the S2 pin of the CD4052 chip are connected to the control end of the automatic gain module (5), the first end of the resistor R10 is connected to the 1Y0 pin of the CD4052 chip, the first end of the resistor R11 is connected to the 1Y2 pin of the CD4052 chip, the first end of the resistor R12 is connected to the 1Y3 pin of the CD4052 chip, the second ends of the resistors R10, R11 and R12 are connected to the inverting input end of the operational amplifier U2, the first end of the resistor R13 is connected to the inverting input end of the operational amplifier U2, the second end of the resistor R13 is connected to the output end of the operational amplifier U2, the non-inverting input end of the operational amplifier U2 is connected to the ground, the output end of the operational amplifier U2 is connected to the first end of the resistor R14, the second end of the resistor R14 is connected to the inverting input end of the operational amplifier U3, the first end of the resistor R15 is connected to the inverting input end of the operational amplifier U3, the second end of the resistor R15 is connected to the output end of the operational amplifier U3, the non-inverting input end of the operational amplifier U3 is connected to the ground, and the output end of the operational amplifier U3 is connected to the output end of the automatic gain module (5).

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