CN210109333U

CN210109333U - GPS receiver

Info

Publication number: CN210109333U
Application number: CN201920473051.4U
Authority: CN
Inventors: 黄东章
Original assignee: Guangxi Junjin Technology Co Ltd
Current assignee: Guangxi Junjin Technology Co Ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2020-02-21
Anticipated expiration: 2029-04-09

Abstract

The utility model discloses a GPS receiver, which comprises an antenna, an antenna filter, a preamplifier, a radio frequency chip, a crystal oscillator, a radio frequency filter, a correlator, a singlechip and a power module, wherein the antenna is connected with the preamplifier through the antenna filter; the power module comprises a transformer, a first capacitor, a rectifier bridge, a first resistor, a second resistor, a first triode, a first diode, a second variable capacitor, a third resistor, a third diode, a first unidirectional thyristor, a second unidirectional thyristor, a fourth resistor, a fifth resistor, a sixth resistor, a second diode, a fourth capacitor and a voltage output end, wherein one end of a primary coil of the transformer is connected with one end of 220V alternating current. The utility model discloses circuit structure is comparatively simple, the cost is lower, the security and the reliability of convenient maintenance, circuit are higher.

Description

GPS receiver

Technical Field

The utility model relates to a communication equipment field, in particular to GPS receiver.

Background

A GPS receiver is an instrument that receives global positioning system satellite signals and determines the position of the ground space. The navigation positioning signal sent by the GPS satellite is an information resource which can be shared by countless users. For a large number of users on land, sea and space, a GPS signal receiver is provided as long as it has a receiving device capable of receiving, tracking, transforming and measuring GPS signals. The power supply part of the traditional GPS receiver uses more components, the circuit structure is complex, the hardware cost is high, and the maintenance is inconvenient. In addition, since the power supply part of the conventional GPS receiver lacks a corresponding circuit protection function, for example: the safety and reliability of the circuit are poor due to the lack of the current-limiting protection function.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a circuit structure is comparatively simple, the cost is lower, the security and the higher GPS receiver of reliability of convenient maintenance, circuit are provided.

The utility model provides a technical scheme that its technical problem adopted is: constructing a GPS receiver, which comprises an antenna, an antenna filter, a preamplifier, a radio frequency chip, a crystal oscillator, a radio frequency filter, a correlator, a singlechip and a power module, wherein the antenna is connected with the preamplifier through the antenna filter, the preamplifier is connected with the radio frequency chip, the crystal oscillator and the radio frequency filter are both connected with the radio frequency chip, the radio frequency chip is connected with the singlechip through the correlator, and the power module is connected with the radio frequency chip;

the power module comprises a transformer, a first capacitor, a rectifier bridge, a first resistor, a second resistor, a first triode, a first diode, a second variable capacitor, a third resistor, a third diode, a first unidirectional thyristor, a second unidirectional thyristor, a fourth resistor, a fifth resistor, a sixth resistor, a second diode, a fourth capacitor and a voltage output end, one end of a primary coil of the transformer is connected with one end of 220V alternating current, the other end of the primary coil of the transformer is connected with the other end of the 220V alternating current, one end of a secondary coil of the transformer is respectively connected with one end of the first capacitor and one input end of the rectifier bridge, the other end of a secondary coil of the transformer is respectively connected with the other end of the first capacitor and the other input end of the rectifier bridge, and one output end of the rectifier bridge is respectively connected with one end of the second resistor, The anode of the first unidirectional thyristor, the control electrode of the second unidirectional thyristor and one end of a third resistor are connected, the base electrode of the first triode is respectively connected with the anode of the third diode and one end of the first resistor, the collector electrode of the first triode is respectively connected with the other end of the second resistor, one end of a second variable capacitor and the anode of the second unidirectional thyristor, the control electrode of the first unidirectional thyristor is respectively connected with the cathode of the second unidirectional thyristor and one end of a fourth resistor, the cathode of the first unidirectional thyristor is connected with one end of a fifth resistor, the other end of the fifth resistor is respectively connected with one end of a third capacitor and one end of a sixth resistor, the cathode of the third diode is respectively connected with the other end of the sixth resistor, the anode of the second diode, one end of the fourth capacitor and one end of a voltage output end, and the other output end of the rectifier bridge is respectively connected with the other end of the first resistor, the anode of the first diode, the other end of the second variable capacitor, the other end of the third resistor, the other end of the fourth resistor, the other end of the third capacitor, the cathode of the second diode, the other end of the fourth capacitor and the other end of the voltage output end, and the type of the third diode is S-272T.

In the GPS receiver, the power module further includes a seventh resistor, one end of the seventh resistor is connected to the control electrode of the first unidirectional thyristor, the other end of the seventh resistor is connected to the cathode of the second unidirectional thyristor and one end of the fourth resistor, and the resistance of the seventh resistor is 37k Ω.

In the GPS receiver of the present invention, the power module further includes a fifth capacitor, one end of the fifth capacitor is connected to the collector of the first triode, the other end of the fifth capacitor is connected to one end of the second variable capacitor, and the capacitance of the fifth capacitor is 370 pF.

In the GPS receiver, the power module further includes an eighth resistor, one end of the eighth resistor is connected to an output end of the rectifier bridge, the other end of the eighth resistor is connected to one end of the second resistor, and a resistance of the eighth resistor is 48k Ω.

In the GPS receiver of the present invention, the first transistor is an NPN transistor.

Implement the utility model discloses a GPS receiver has following beneficial effect: the system is provided with an antenna, an antenna filter, a preamplifier, a radio frequency chip, a crystal oscillator, a radio frequency filter, a correlator, a singlechip and a power module; the power module comprises a transformer, a first capacitor, a rectifier bridge, a first resistor, a second resistor, a first triode, a first diode, a second variable capacitor, a third resistor, a third diode, a first unidirectional thyristor, a second unidirectional thyristor, a fourth resistor, a fifth resistor, a sixth resistor, a second diode, a fourth capacitor and a voltage output end, the power module is compared with the power supply part of a traditional GPS receiver, fewer components and parts used by the power module, and hardware cost can be reduced due to the fact that some components and parts are saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a GPS receiver of the present invention;

fig. 2 is a schematic circuit diagram of the power supply module in the embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the embodiment of the GPS receiver of the present invention, a schematic structural diagram of the GPS receiver is shown in fig. 1. In fig. 1, the GPS receiver includes an antenna 1, an antenna filter 2, a preamplifier 3, a radio frequency chip 4, a crystal oscillator 5, a radio frequency filter 6, a correlator 7, a single chip microcomputer 8, and a power module 9, where the antenna 1 is connected to the preamplifier 3 through the antenna filter 2, the preamplifier 3 is connected to the radio frequency chip 4, the crystal oscillator 5 and the radio frequency filter 6 are both connected to the radio frequency chip 4, the radio frequency chip 4 is connected to the single chip microcomputer 8 through the correlator 7, and the power module 9 is connected to the radio frequency chip 4.

The antenna 1 converts electromagnetic wave signals transmitted by a GPS satellite into electric signals, the antenna filter 2 filters interference signals in the electric signals, and the signal current is amplified through the preamplifier 3. The radio frequency chip 4 adopts a GP2015 chip. The electric signal belongs to an ultrahigh frequency signal, and good noise coefficient and stability are difficult to ensure in high frequency, so that down-conversion processing is required to be carried out in comparison, and the frequency is reduced. Specifically, the electric signal is mixed with a first-stage mixer in the radio frequency chip 4, the local oscillation frequency of the first-stage mixer is from a radio frequency synthesizer, the signal after the first-stage mixing is filtered by a first-stage filter and then mixed with a second-stage mixer, and the local oscillation frequency of the second-stage mixer is obtained by frequency division of the first-stage local oscillation signal; and filtering the second-stage mixed signal by a second-stage filter, and mixing the second-stage mixed signal with a third-stage mixer, wherein the local oscillation frequency of the third-stage mixer is obtained by frequency division of the first-stage local oscillation signal. And the signal after the third-stage frequency mixing is filtered by a filter carried by the radio frequency chip 4. The signal after the three-level mixing is down-converted to an intermediate frequency signal after three times of frequency reduction, and the intermediate frequency signal is converted to a digital signal through an analog-to-digital converter.

The working clock frequency of the radio frequency chip 4 comes from the crystal oscillator 5, the correlator 7 demodulates and despreads the intermediate frequency signal sent by the radio frequency chip 4, and the obtained navigation message is sent to the single chip microcomputer 8. Specifically, the intermediate frequency signal is sampled and dispersed into two digital signals, one is an amplitude bit and the other is a sign bit, the two paths of discrete digital intermediate frequency signals are transmitted to the correlator 7, the carrier and the pseudo code are stripped through a mixer and the correlator 7 in the correlator 7, the intermediate frequency carrier after frequency reduction is stripped, the signals are really reduced to a baseband, demodulation and despreading of the intermediate frequency signals are completed, and a navigation message is obtained and sent to the single chip microcomputer 8.

The singlechip 8 performs reading operation and writing operation on the correlator 7, acquires navigation decoding and controls the signal capturing and tracking process of the correlator 7, decodes the navigation message sent by the correlator 7, and acquires navigation data, thereby realizing GPS positioning.

Fig. 2 is a schematic circuit diagram of a power module in this embodiment, in fig. 2, the power module 9 includes a transformer T, a first capacitor C1, a rectifier bridge Z, a first resistor R1, a second resistor R2, a first transistor Q1, a first diode D1, a second variable capacitor C2, a third resistor R3, a third diode D3, a first unidirectional thyristor RT1, a second unidirectional thyristor RT2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second diode D2, a fourth capacitor C4, and a voltage output Vo, one end of a primary winding of the transformer T is connected to one end of 220V ac power, the other end of the primary winding of the transformer T is connected to the other end of the 220V ac power, one end of a secondary winding of the transformer T is connected to one end of the first capacitor C1 and one input end of the rectifier bridge, and the other end of the secondary winding of the transformer T is connected to the other end of the first capacitor C1 and the other input end of the rectifier bridge Z, an output end of the rectifier bridge Z is respectively connected with one end of a second resistor R2, an anode of a first unidirectional thyristor RT1, a control electrode of a second unidirectional thyristor RT2 and one end of a third resistor R3, a base electrode of a first triode Q1 is respectively connected with an anode of a third diode D3 and one end of a first resistor R1, a collector electrode of a first triode Q1 is respectively connected with the other end of a second resistor R2, one end of a second variable capacitor C2 and an anode of a second unidirectional thyristor RT2, a control electrode of a first unidirectional thyristor RT1 is respectively connected with a cathode of the second unidirectional thyristor RT2 and one end of a fourth resistor R4, a cathode of the first unidirectional thyristor RT1 is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is respectively connected with one end of a third capacitor C3 and one end of the sixth resistor R6, a cathode of a third diode D5 is respectively connected with an anode of a sixth resistor R58R 6 and another end of a second resistor R5857324, and the other end of a third diode R3, One end of the fourth capacitor C4 is connected to one end of the voltage output terminal Vo, and the other output end of the rectifier bridge Z is connected to the other end of the first resistor R1, the anode of the first diode D1, the other end of the second variable capacitor C2, the other end of the third resistor R3, the other end of the fourth resistor R4, the other end of the third capacitor C3, the cathode of the second diode D2, the other end of the fourth capacitor C4, and the other end of the voltage output terminal Vo, respectively.

Compared with the power supply part of the traditional GPS receiver, the power supply module 9 has the advantages of less used components, simpler circuit structure and convenient maintenance, can reduce the hardware cost due to saving some components, and in addition, the third diode D3 is a current-limiting diode and is used for current-limiting protection, so the safety and the reliability of the circuit are higher. It should be noted that in the present embodiment, the model of the third diode D3 is S-272T, and certainly, in practical applications, other models of diodes with similar functions may be adopted as the third diode D3.

The working principle of the power module 9 is as follows: the 220V alternating voltage is directly added to a rectifier bridge Z to become stable direct current, a first capacitor C1 is a filter capacitor, the output direct current voltage is added to the cathode of a first unidirectional thyristor RT1, the output voltage can be adjusted to keep stable as long as the phase of trigger pulse of the first unidirectional thyristor RT1 is changed, and an integration delay circuit is formed by a collector of a first triode Q1, a second resistor R2 and a variable capacitor C2. The rectified input voltage is delayed and then is added to the anode of a first unidirectional thyristor RT1, the output voltage is filtered by a two-stage RC filter consisting of a fifth resistor R5, a sixth resistor R6, a third capacitor C3 and a fourth capacitor C4 and then is converted into smooth direct current, and a first diode D1 is a voltage stabilizing diode for providing reference voltage for a first triode Q1. The first resistor R1 and the third diode D2 form a sampling voltage division circuit, the sampling voltage division circuit and the second thyristor RT2 control the voltage together, and if the output voltage is increased due to some reason, the sampling voltage provided by the sampling circuit to the base of the first triode Q1 is also increased, the collector current is increased, the charging current of the second variable capacitor C2 is reduced, the conduction time of the first unidirectional thyristor RT1 is delayed, the conduction angle of the first unidirectional thyristor RT1 is reduced, and the output voltage is reduced. When the output voltage decreases, the adjustment in the opposite direction is performed according to the above process, and the conduction angle of the first unidirectional thyristor RT1 increases, so that the decreased output voltage rises, thereby maintaining the stability of the voltage applied to both ends of the single chip microcomputer 8.

In this embodiment, the first transistor Q1 is an NPN transistor. Of course, in practical applications, the first transistor Q1 may also be a PNP transistor, but the structure of the circuit is changed accordingly.

In this embodiment, the power module 9 further includes a seventh resistor R7, one end of the seventh resistor R7 is connected to the control electrode of the first unidirectional thyristor RT1, and the other end of the seventh resistor R7 is connected to the cathode of the second unidirectional thyristor RT2 and one end of the fourth resistor R4, respectively. The seventh resistor R7 is a current limiting resistor for current limiting protection to further enhance the safety and reliability of the circuit. It should be noted that in the embodiment, the resistance value of the seventh resistor R7 is 37k Ω, and certainly, in practical applications, the resistance value of the seventh resistor R7 may be adjusted according to specific situations, that is, the resistance value of the seventh resistor R7 may be increased or decreased according to specific situations.

In this embodiment, the power module 9 further includes a fifth capacitor C5, one end of the fifth capacitor C5 is connected to the collector of the first transistor Q1, and the other end of the fifth capacitor C5 is connected to one end of the second variable capacitor C2. The fifth capacitor C5 is a coupling capacitor for preventing interference between the first transistor Q1 and the second unidirectional thyristor RT2, so as to further enhance the safety and reliability of the circuit. It should be noted that in the present embodiment, the capacitance value of the fifth capacitor C5 is 370pF, and certainly, in practical applications, the capacitance value of the fifth capacitor C5 may be adjusted accordingly according to specific situations, that is, the capacitance value of the fifth capacitor C5 may be increased or decreased accordingly according to specific situations.

In this embodiment, the power module 9 further includes an eighth resistor R8, one end of the eighth resistor R8 is connected to one output end of the rectifier bridge Z, and the other end of the eighth resistor R8 is connected to one end of the second resistor R2. The eighth resistor R8 is a current limiting resistor for performing current limiting protection to further enhance the current limiting effect. It should be noted that, in the present embodiment, the resistance of the eighth resistor R8 is 48k Ω. Of course, in practical applications, the resistance of the eighth resistor R8 may be adjusted according to specific situations, that is, the resistance of the eighth resistor R8 may be increased or decreased according to specific situations.

In a word, in this embodiment, compared with the power supply part of the conventional GPS receiver, the power supply module 9 uses fewer components, has a simpler circuit structure, is convenient to maintain, can reduce hardware cost due to the fact that some components are saved, and is provided with a current limiting diode in the power supply module 9, so that the safety and reliability of the circuit are higher.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A GPS receiver is characterized by comprising an antenna, an antenna filter, a preamplifier, a radio frequency chip, a crystal oscillator, a radio frequency filter, a correlator, a single chip microcomputer and a power supply module, wherein the antenna is connected with the preamplifier through the antenna filter, the preamplifier is connected with the radio frequency chip, the crystal oscillator and the radio frequency filter are both connected with the radio frequency chip, the radio frequency chip is connected with the single chip microcomputer through the correlator, and the power supply module is connected with the radio frequency chip;

2. The GPS receiver according to claim 1, wherein the power module further comprises a seventh resistor, one end of the seventh resistor is connected to the control electrode of the first unidirectional thyristor, the other end of the seventh resistor is respectively connected to the cathode of the second unidirectional thyristor and one end of a fourth resistor, and the resistance value of the seventh resistor is 37k Ω.

3. The GPS receiver according to claim 2, wherein the power supply module further comprises a fifth capacitor, one end of the fifth capacitor is connected to the collector of the first transistor, the other end of the fifth capacitor is connected to one end of the second variable capacitor, and the capacitance of the fifth capacitor is 370 pF.

4. The GPS receiver according to claim 3, wherein the power module further comprises an eighth resistor, one end of the eighth resistor is connected to one output end of the rectifier bridge, the other end of the eighth resistor is connected to one end of the second resistor, and the resistance of the eighth resistor is 48k Ω.

5. A GPS receiver according to any one of claims 1 to 4, wherein the first transistor is an NPN transistor.