CN212694057U - Positioning circuit and positioning device - Google Patents
Positioning circuit and positioning device Download PDFInfo
- Publication number
- CN212694057U CN212694057U CN202021967031.1U CN202021967031U CN212694057U CN 212694057 U CN212694057 U CN 212694057U CN 202021967031 U CN202021967031 U CN 202021967031U CN 212694057 U CN212694057 U CN 212694057U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- positioning
- resistor
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The utility model provides a positioning circuit and positioner, through when first antenna circuit breaks down the disconnection, first antenna circuit stops flowing through the electric current, detection circuitry stops exporting first detection current to control circuit, thereby control circuit stops importing first detection current and stops exporting first control signal, switching circuit stops importing first control signal and connects second positioning signal to positioning signal receiving arrangement, make positioning signal receiving arrangement can acquire relevant location satellite signal through second antenna circuit when first antenna circuit breaks down the disconnection, positioning circuit's the reliability of acquireing location satellite signal has been improved, thereby positioning circuit's positioning stability has been improved.
Description
Technical Field
The application belongs to the technical field of positioning, and particularly relates to a positioning circuit and a positioning device.
Background
The antenna that is used for the location of traditional positioner is single, just can't fix a position the vehicle after the antenna damage, can make the vehicle lose the locate function before changing the antenna of damage.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a positioning circuit, aim at solving the antenna that traditional positioner exists and damage the problem that the back can't be fixed a position the vehicle.
A first aspect of an embodiment of the present application provides a positioning circuit, including:
a first antenna circuit configured to receive a positioning satellite signal and convert the positioning satellite signal into a first positioning signal;
a second antenna circuit configured to receive the positioning satellite signal and convert the positioning satellite signal into a second positioning signal;
the detection circuit is connected with the first antenna circuit and is configured to detect the on-off of the first antenna circuit so as to generate a first detection current;
a control circuit connected to the detection circuit and configured to output the first control signal according to the first detection current; and
and the switching circuit is respectively connected with the control circuit, the first antenna circuit and the second antenna circuit and is configured to switch the first positioning signal to the positioning signal receiving device when the first control signal is input and switch the second positioning signal to the positioning signal receiving device when the first control signal is stopped being input.
In one embodiment, the first antenna circuit includes an active antenna, a first resistor, a second resistor, and a first capacitor; the second antenna circuit comprises a passive antenna, a third resistor, a fourth resistor and a second capacitor;
the first end of the first resistor and the first end of the first capacitor are connected in common to form a first positioning signal output end of the first antenna circuit, the second end of the first capacitor, the first end of the second resistor and the signal output end of the active antenna are connected in common to form an on-off detection end of the first antenna circuit, the second end of the first resistor, the second end of the second resistor, the first grounding end of the active antenna and the second grounding end of the active antenna are all connected with a power ground, and the active antenna is used for receiving the positioning satellite signal;
the first end of the third resistor and the first end of the second capacitor are connected in common to form a second positioning signal output end of the second antenna circuit, the second end of the second capacitor, the first end of the fourth resistor and the signal output end of the passive antenna are connected in common, the first grounding end of the passive antenna, the second grounding end of the passive antenna, the third grounding end of the passive antenna, the second end of the third resistor and the second end of the fourth resistor are connected with a power ground, and the passive antenna is used for receiving the positioning satellite signals.
In one embodiment, the detection circuit includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, and a first inductor;
a first end of the fifth resistor and a first end of the ninth resistor are connected in common and are connected with an internal power supply, a second end of the ninth resistor and an emitter of the third field effect transistor are connected, a collector of the third field effect transistor, a base of the third field effect transistor, a first end of the seventh resistor and a base of the second field effect transistor are connected in common, an emitter of the second field effect transistor, a second end of the fifth resistor, a first end of the third capacitor and a first end of the first inductor are connected in common, a collector of the second field effect transistor and a first end of the eighth resistor are connected in common, a second end of the eighth resistor, a first end of the sixth resistor and a gate of the first field effect transistor are connected in common, a drain of the first field effect transistor and a first end of the tenth resistor are connected in common to form a first detection current output end of the detection circuit, a second end of the tenth resistor is connected with a pull-up voltage power supply, a source electrode of the first field effect transistor, a second end of the sixth resistor and a second end of the seventh resistor are all connected with a power ground, and a second end of the first inductor is a first antenna circuit on-off detection end of the detection circuit.
In one embodiment, the switching circuit includes a wireless communication single-pole double-throw switch chip, a fourth capacitor and a fifth capacitor;
the first radio-frequency signal receiving end of the wireless communication single-pole double-throw switch chip is the first positioning signal input end of the switching circuit, the second radio-frequency signal receiving end of the wireless communication single-pole double-throw switch chip is the second positioning signal input end of the switching circuit, the radio-frequency signal output end of the wireless communication single-pole double-throw switch chip is the first positioning signal output end of the switching circuit and the second positioning signal output end of the switching circuit, the control end of the wireless communication single-pole double-throw switch chip is the first control signal input end of the switching circuit, the power end of the wireless communication single-pole double-throw switch chip is connected with an internal power supply, and the grounding end of the wireless communication single-pole double-throw switch chip is connected with a power ground.
In one embodiment, the positioning circuit further includes:
and the signal modulation circuit is respectively connected with the switching circuit and the positioning signal receiving device and is configured to convert the first positioning signal or the second positioning signal into a third positioning signal and output the third positioning signal to the positioning signal receiving device.
In one embodiment, the signal modulation circuit includes a signal modulation chip, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a second inductor, a third inductor, a fourth inductor, an eleventh resistor, a signal filter, and a low noise amplifier;
the first end of the sixth capacitor is the first positioning signal input end of the signal modulation circuit and the second positioning signal input end of the signal modulation circuit, the second end of the sixth capacitor, the first end of the second inductor and the first end of the eleventh resistor are connected in common, the second end of the eleventh resistor, the first end of the third inductor and the input end of the signal filter are connected in common, the output end of the signal filter, the first end of the seventh capacitor and the first end of the fourth inductor are connected in common, the second end of the fourth inductor, the first end of the eighth capacitor and the analog quantity signal input end of the low noise amplifier are connected in common, the analog quantity signal output end of the low noise amplifier is connected with the radio frequency signal input end of the signal modulation chip, and the positioning data output end of the signal modulation chip is the third positioning signal output end of the signal modulation circuit, a first end of the ninth capacitor is commonly connected to a power source terminal of the low noise amplifier and is connected to an internal power source, and a second end of the ninth capacitor, the first ground terminal of the low noise amplifier, the second end of the second inductor, the second end of the third inductor, the first ground terminal of the signal filter, the second ground terminal of the signal filter, the third ground terminal of the signal filter, the second end of the seventh capacitor, and the second end of the eighth capacitor are all connected to a power ground.
In one embodiment, the positioning circuit further includes:
the voltage stabilizing output circuit is connected with the detection circuit and is configured to convert the voltage of the external power supply and/or the voltage of the internal power supply into a first voltage according to a second control signal and output the first voltage to supply power to the detection circuit;
the control circuit is further configured to output the second control signal.
In one embodiment, the control circuit is connected with the positioning signal receiving device;
the control circuit is further configured to output the first control signal for a second time at startup or after every first time interval, and stop outputting the first control signal for a third time at the end of the first time;
the positioning signal receiving device is configured to compare the signal strength of the first positioning signal at the second time with the signal strength of the second positioning signal at the third time and output a third control signal according to the comparison result;
the control circuit is further configured to output the first control signal or stop outputting the first control signal according to the third control signal.
In one embodiment, the control circuit is connected with the positioning signal receiving device;
the positioning signal receiving device is configured to output a fourth control signal when the signal intensity of the input first positioning signal is smaller than a first preset value, and output a fifth control signal when the signal intensity of the input first positioning signal is smaller than a second preset value;
the control circuit is further configured to stop outputting the first control signal when the fourth control signal is input, and output the first control signal when the fifth control signal is input.
A second aspect of embodiments of the present application provides a positioning apparatus, including the positioning circuit as in any of the embodiments of the first aspect.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: according to the positioning circuit, when the first antenna circuit is disconnected due to a fault, the first antenna circuit stops flowing current, the detection circuit stops outputting the first detection current to the control circuit, the control circuit stops inputting the first detection current so as to stop outputting the first control signal, the switching circuit stops inputting the first control signal and switches the second positioning signal to the positioning signal receiving device, so that the positioning signal receiving device can obtain related positioning satellite signals through the second antenna circuit when the first antenna circuit is disconnected due to the fault, the reliability of the positioning circuit for obtaining the positioning satellite signals is improved, and the positioning stability of the positioning circuit is improved.
Drawings
Fig. 1 is a first exemplary functional block diagram of a positioning circuit provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a portion of an exemplary circuit for a positioning circuit provided by an embodiment of the present application;
FIG. 3 is a second exemplary functional block diagram of a positioning circuit provided in an embodiment of the present application;
FIG. 4 is an exemplary circuit schematic diagram of a signal modulation circuit provided by an embodiment of the present application;
FIG. 5 is an exemplary circuit schematic diagram of a regulated output circuit provided by an embodiment of the present application;
FIG. 6 is an exemplary circuit schematic of a control circuit provided by an embodiment of the present application;
fig. 7 is a third exemplary functional block diagram of a control circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 shows a first exemplary structural schematic diagram of a positioning circuit provided in an embodiment of the present application, and for convenience of description, only a part related to the present embodiment is shown, and details are as follows:
a positioning circuit includes a first antenna circuit 110, a second antenna circuit 120, a detection circuit 130, a control circuit 150, and a switching circuit 140.
The first antenna circuit 110 is configured to receive a positioning satellite signal and convert the positioning satellite signal into a first positioning signal.
A second antenna circuit 120 configured to receive the positioning satellite signal and convert the positioning satellite signal into a second positioning signal.
The detection circuit 130 is connected to the first antenna circuit 110, and configured to detect on/off of the first antenna circuit 110 to generate a first detection current.
The control circuit 150 is connected to the detection circuit 130 and configured to output a first control signal according to the first detection current.
The switching circuit 140 is respectively connected to the control circuit 150, the first antenna circuit 110 and the second antenna circuit 120, and is configured to switch the first positioning signal to the positioning signal receiving device 200 when the first control signal is input, and switch the second positioning signal to the positioning signal receiving device 200 when the input of the first control signal is stopped.
In the embodiment, when the detection circuit 130 detects that the first antenna circuit 110 is turned on, a first detection current is generated and outputted to the control circuit 150, the control circuit 150 outputs a first control signal to the switching circuit 140 when the first detection current is inputted, the switching circuit 140 transfers a first positioning signal generated by the first antenna circuit 110 to the positioning signal receiving device 200 when the first control signal is inputted, at this time, the positioning signal receiving device 200 obtains a positioning satellite signal through the first antenna circuit 110, when the first antenna circuit 110 is disconnected due to a fault, the first antenna circuit 110 cannot continuously provide the first positioning signal and the first antenna circuit 110 stops flowing current, the detection circuit 130 stops outputting the first detection current to the control circuit 150, the control circuit 150 stops inputting the first detection current and stops outputting the first control signal, the switching circuit 140 stops inputting the first control signal and transfers the second positioning signal to the positioning signal receiving device 200, the positioning signal receiving device 200 can obtain the positioning satellite signal through the second antenna circuit 120 when the first antenna circuit 110 is disconnected due to a fault, so that the reliability of the positioning circuit for obtaining the positioning satellite signal is improved, and the positioning stability of the positioning circuit is improved.
Referring to fig. 2, in an embodiment, the first antenna circuit 110 includes an active antenna ANT1, a first resistor R1, a second resistor R2, and a first capacitor C1, a first end of the first resistor R1 and a first end of the first capacitor C1 are commonly connected to form a first positioning signal output end of the first antenna circuit 110, a second end of the first capacitor C1, a first end of the second resistor R2, and a signal output end of the active antenna ANT1 are commonly connected to form an on-off detection end of the first antenna circuit 110, a second end of the first resistor R1, a second end of the second resistor R2, a first ground end of the active antenna ANT1, and a second ground end of the active antenna ANT1 are all connected to a power ground, and the active antenna ANT1 is configured to receive positioning satellite signals.
Referring to fig. 2, in an embodiment, the second antenna circuit 120 includes a passive antenna ANT2, a third resistor R3, a fourth resistor R4 and a second capacitor C2, a first end of the third resistor R3 and a first end of the second capacitor C2 are commonly connected to form a second positioning signal output end of the second antenna circuit 120, a second end of the second capacitor C2, a first end of the fourth resistor R4 and a signal output end of the passive antenna ANT2 are commonly connected, a first ground end of the passive antenna ANT2, a second ground end of the passive antenna ANT2, a third ground end of the passive antenna ANT2, a second end of the third resistor R3 and a second end of the fourth resistor R4 are all connected to a power ground, and the passive antenna ANT2 is configured to receive positioning satellite signals.
Referring to fig. 2, in an embodiment, the detection circuit 130 includes a first fet Q1, a second fet Q2, a third fet Q3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3 and a first inductor L1, a first end of the fifth resistor R5 and a first end of the ninth resistor R9 are connected in common and connected to an internal power source, a second end of the ninth resistor R9 and an emitter of the third fet Q3 are connected, a collector of the third fet Q3, a base of the third fet Q3, a first end of the seventh resistor R7 and a base of the second fet Q2 are connected in common, an emitter of the second fet Q2, a second end of the fifth resistor R5, a first end of the third capacitor C3, a first end of the first inductor L1 and a collector of the second inductor L8 are connected to the eighth fet Q2, the second end of the eighth resistor R8, the first end of the sixth resistor R6 and the gate of the first field-effect transistor Q1 are connected in common, the drain of the first field-effect transistor Q1 and the first end of the tenth resistor R10 are connected in common to form a first detection current output end of the detection circuit 130, the second end of the tenth resistor R10 is connected with a pull-up voltage power supply, the source of the first field-effect transistor Q1, the second end of the sixth resistor R6 and the second end of the seventh resistor R7 are all connected with the power ground, and the second end of the first inductor L1 is the on-off detection end of the first antenna circuit 110 of the detection circuit 130.
Referring to fig. 2, in one embodiment, the switching circuit 140 includes a wireless communication single-pole double-throw switch chip U1, a fourth capacitor C4 and a fifth capacitor C5, the first RF signal receiving terminal RF1 of the wireless communication single-pole double-throw switch chip U1 and the first positioning signal input terminal of the switching circuit 140, the second RF signal receiving terminal RF2 of the wireless communication single-pole double-throw switch chip U1 is the second positioning signal input terminal of the switching circuit 140, the RF signal output terminal RFOUT of the wireless communication single-pole double-throw switch chip U1 is the first positioning signal output terminal of the switching circuit 140 and the second positioning signal output terminal of the switching circuit 140, the control terminal CTRL of the wireless communication single-pole double-throw switch chip U1 is the first control signal input terminal of the switching circuit 140, the power terminal VDD of the wireless communication single-pole double-throw switch chip U1 is connected to an internal power supply, and the ground terminal GND1 of the wireless communication single-pole double-throw switch chip U1 is connected to a power ground.
Referring to fig. 3, in an embodiment, the positioning circuit further includes a signal modulation circuit 160, the signal modulation circuit 160 is respectively connected to the switching circuit 140 and the positioning signal receiving apparatus 200, and the signal modulation circuit 160 is configured to convert the first positioning signal or the second positioning signal into a third positioning signal and output the third positioning signal to the positioning signal receiving apparatus 200.
In the embodiment, the signal modulation circuit 160 processes the first positioning signal or the second positioning signal input by the switching circuit 140 to convert into a third positioning signal and outputs the third positioning signal to the positioning signal receiving apparatus 200, so that the first positioning signal and the second positioning signal can be adjusted to be suitable for the positioning signal receiving apparatus 200, thereby reducing the hardware requirement of the positioning signal receiving apparatus 200.
Referring to fig. 4, in an embodiment, the signal modulation circuit 160 includes a signal modulation chip U5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a second inductor L2, a third inductor L3, a fourth inductor L4, an eleventh resistor R11, a signal filter U6 and a low noise amplifier U4, a first end of the sixth capacitor C6 is a first positioning signal input end of the signal modulation circuit 160 and a second positioning signal input end of the signal modulation circuit 160, a second end of the sixth capacitor C6, a first end of the second inductor L2 and a first end of the eleventh resistor R11 are connected in common, a second end of the eleventh resistor R11, a first end of the third inductor L3 and an input end of the signal filter U6 are connected in common, an output end of the signal filter U6, a first end of the seventh capacitor C7 and a first end of the fourth inductor L4 are connected in common, and a second end of the fourth inductor L4 are connected in common, The first terminal of the eighth capacitor C8 and the analog signal input terminal AI of the low noise amplifier U4 are connected in common, the analog signal output terminal AO of the low noise amplifier U4 is connected to the radio frequency signal input terminal RFIN of the signal modulation chip U5, the positioning data output terminal GPSTX of the signal modulation chip U5 is the third positioning signal output terminal of the signal modulation circuit 160, the first terminal of the ninth capacitor C9 is connected in common to the power supply terminal VCC of the low noise amplifier U4 and is connected to the internal power supply, the second terminal of the ninth capacitor C9, the first ground terminal GNGRF of the low noise amplifier U4, the second ground terminal GND3 of the low noise amplifier U4, the second terminal of the second inductor L2, the second terminal of the third inductor L3, the first ground terminal G1 of the signal filter U6, the second ground terminal G2 of the signal filter U6, the third ground terminal G3 of the signal filter U6, the second terminal of the seventh capacitor C7, and the second terminal of the eighth capacitor C8 are all connected to the power ground.
Referring to fig. 3, in an embodiment, the positioning circuit further includes a voltage regulation output circuit 170, the voltage regulation output circuit 170 is connected to the detection circuit 130, the voltage regulation output circuit 170 is configured to convert the voltage of the external power source and/or the voltage of the internal power source into a first voltage according to a second control signal and output the first voltage to power the detection circuit 130, and the control circuit 150 is further configured to output a second control signal.
In this embodiment, when the second control signal is input, the regulated output circuit 170 converts the voltage of the external power supply and/or the voltage of the internal power supply into the first voltage, and the first voltage is used to supply power to the detection circuit 130, so that the stability of the supply voltage of the detection circuit 130 can be improved, and the detection accuracy of the detection circuit 130 can be improved.
Referring to fig. 5, IN an embodiment, the regulated output circuit 170 includes a regulated chip U3, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a twelfth resistor R12 and a thirteenth resistor R13, a voltage input terminal IN1 of the regulated chip U3 and a first terminal of the tenth capacitor C10 are commonly connected to form a voltage input terminal of an external power source of the regulated output circuit 170, a voltage output terminal OUT1 of the regulated chip U3, a first terminal of the twelfth capacitor C12, a first terminal of the thirteenth capacitor C13 and a first terminal of the twelfth resistor R12, a feedback terminal BP/RF of the regulated chip U3 is connected to the first terminal of the eleventh capacitor C11, a second terminal of the twelfth resistor R12, a first terminal of the thirteenth resistor R13, a first terminal of the first capacitor C14 and a fifteenth capacitor C15 to form a first analog output terminal of a regulated output voltage output circuit 170, a second end of the thirteenth resistor R13 is a voltage input end of the internal power supply of the voltage regulation output circuit 170, the enable end EN of the voltage regulation chip U3 is a second control signal input end of the voltage regulation output circuit 170, and a ground end GND2 of the voltage regulation chip U3, a second end of the tenth capacitor C10, a second end of the eleventh capacitor C11, a second end of the twelfth capacitor C12, a second end of the thirteenth capacitor C13, a second end of the fourteenth capacitor C14, and a second end of the fifteenth capacitor C15 are all connected to the power ground.
Referring to fig. 6, in an embodiment, the control circuit 150 includes a current control chip U2, a current collecting terminal CS of the current control chip U2 is a first detection current input terminal of the control circuit 150, a first general purpose input/output terminal PA1 of the current control chip U2 is a first control signal output terminal of the control circuit 150, and a second general purpose input/output terminal PA2 of the current control chip U2 is a second control signal output terminal of the control circuit 150.
The positioning circuit shown IN fig. 2, 4, 5 and 6 is described with reference to the operation principle, when the enable terminal EN of the regulator chip U3 inputs the second control signal, the regulator chip U3 adjusts the voltage of the external power source input by the voltage input terminal IN1 of the regulator chip U3 and then outputs the second voltage through the twelfth resistor R12, the voltage of the internal power source outputs the third voltage through the thirteenth resistor R13, the larger of the second voltage and the third voltage is output as the first voltage, when the active antenna ANT1 normally operates to receive the positioning satellite signal, the positioning satellite signal is converted into the first positioning signal through the pi-type filter circuit formed by the first capacitor C1, the first resistor R1 and the second resistor R2, the first voltage is input to the emitter of the third fet Q3 through the ninth resistor R9, the emitter of the second fet Q2 through the fifth resistor R5 and the antenna ANT1 is supplied with power through the fifth inductor R5 and the first inductor L1, because the collector of the third fet Q3, the base of the third fet Q3, and the base of the second fet Q2 are connected in common, when the active antenna ANT1 operates, current is consumed, a first divided voltage is generated in the fifth resistor R5, the voltage of the emitter of the second fet Q2 is equal to the first voltage minus the first divided voltage, and the voltage of the emitter of the second fet Q2 is less than the first divided voltage, so the voltage difference between the emitter of the second fet Q2 and the base of the second fet Q2 is insufficient to turn on the second fet Q2, so the second fet Q2 is turned off, the current collection terminal CS of the current control chip U2 is connected to the pull-up voltage source through the tenth resistor R10, the current collection terminal CS of the current control chip U2 is at a high level (equivalent to the current collection terminal CS of the current control chip U2 inputting the first detection current), the first current control chip input terminal CS of the current control chip U2 outputs the first general purpose control chip PA 38 to the wireless single-blade communication terminal PA1 A control terminal CTRL of the double-throw switch chip U1, a wireless communication single-pole double-throw switch chip U1 controls a first RF signal receiving terminal RF1 of the wireless communication single-pole double-throw switch chip U1 and an RF signal output terminal RFOUT of the wireless communication single-pole double-throw switch chip U1 to be turned on, at this time, a first positioning signal is output through the RF signal output terminal RFOUT of the wireless communication single-pole double-throw switch chip U1, and the first positioning signal is filtered, amplified and adjusted and converted into a third positioning signal through a sixth capacitor C6, an eleventh resistor R11, a signal filter U6, a fourth inductor L4, a low noise amplifier U4 and a modulation chip in sequence, and the third positioning signal is output to the positioning signal receiving apparatus 200 through the positioning data output terminal of the modulation chip, wherein the sixth capacitor C6, the second inductor L2, the third inductor L3, the eleventh resistor R11, the seventh capacitor C7, the fourth inductor L4 and the eighth capacitor C8 constitute an impedance matching circuit, the impedance matching circuit is used for adjusting the line impedance; when the active antenna ANT1 is damaged or pulled out, the active antenna ANT1 no longer consumes current, at this time, the first voltage is input to the emitter of the third fet Q3 through the ninth resistor R9 and is input to the emitter of the second fet Q2 through the fifth resistor R5, the voltage of the emitter of the second fet Q2 is equal to the first voltage, the voltage difference between the emitter of the second fet Q2 and the base of the second fet Q2 increases, the second fet Q2 is turned on, the gate of the first fet 483q 1 is connected to the collector of the second fet Q2 and is turned on at a high level, the current collection terminal CS of the current control chip U2 is grounded at a low level through the first fet Q1 (equivalent to the current collection terminal CS of the current control chip U2 stopping inputting the first detection current), the first general input/output terminal PA1 of the current control chip U2 stops outputting the first control signal, the first switch control chip CS of the single-pole double-switch U1 stops inputting the control signal of the wireless communication chip U367, the wireless communication single-pole double-throw switch chip U1 controls the second RF signal receiving terminal RF2 of the wireless communication single-pole double-throw switch chip U1 to be connected with the RF signal output terminal RFOUT of the wireless communication single-pole double-throw switch chip U1, the second capacitor C2, the third resistor R3 and the fourth resistor R4 form a pi-type filter circuit of the passive antenna ANT2 to convert the positioning satellite signal received by the passive antenna ANT2 into a second positioning signal and output the second positioning signal to the second RF signal receiving terminal RF2 of the wireless communication single-pole double-throw switch chip U1, and the RF signal output terminal RFOUT of the wireless communication single-pole double-throw switch chip U1 outputs the second positioning signal, because the subsequent processing of the second positioning signal is similar to the first positioning signal processing, and therefore will not be described in detail.
Referring to fig. 7, in one embodiment, the control circuit 150 is connected to a positioning signal receiving device 200.
The control circuit 150 is further configured to output the first control signal for a second time at start-up or every interval of the first time, stop outputting the first control signal for a third time at the end of the first time, output the first control signal according to a third control signal or stop outputting the first control signal.
The positioning signal receiving apparatus 200 is configured to compare the signal strength of the first positioning signal lasting for the second time with the signal strength of the second positioning signal lasting for the third time and output a third control signal according to the comparison result.
The control circuit 150 outputs a first control signal lasting for a second time to enable the switching circuit 140 to switch the first positioning signal to the positioning signal receiving device 200 when the power is turned on or at intervals of a first time after the power is turned on, after the first time elapses, the control circuit 150 stops outputting the first control signal lasting for a third time to enable the switching circuit 140 to switch the second positioning signal to the positioning signal receiving device 200, the positioning signal receiving device 200 compares the signal strength of the first positioning signal lasting for the second time with the signal strength of the second positioning signal lasting for the third time, wherein the positioning signal receiving device 200 can perform signal strength value detection on the first positioning signal for the second time three times consecutively and then take an average value thereof, the positioning signal receiving device 200 can perform signal strength value detection on the second positioning signal for the third time three times consecutively and then take an average value thereof, when the signal strength of the first positioning signal is greater than the signal strength of the second positioning signal, the positioning signal receiving apparatus 200 outputs a third control signal carrying reception of the first positioning signal to the control circuit 150 so that the control circuit 150 outputs the first control signal, so that the switching circuit 140 switches the first positioning signal with the higher signal strength to the positioning signal receiving apparatus 200, and when the signal strength of the first positioning signal is less than the signal strength of the second positioning signal, the positioning signal receiving apparatus 200 outputs the third control signal carrying reception of the second positioning signal to the control circuit 150 so that the control circuit 150 stops outputting the first control signal, so that the switching circuit 140 switches the second positioning signal with the higher signal strength to the positioning signal receiving apparatus 200, thereby realizing selective switching of the first antenna circuit 110 and the second antenna circuit 120 according to the strength of the positioning signal, so that the positioning signal provided by one of the first antenna circuit 110 and the second antenna circuit 120 with the higher strength is provided by the other one of the first antenna circuit 110 and the second antenna circuit 120 with the higher strength Number (n).
Referring to fig. 7, in one embodiment, the control circuit 150 is connected to a positioning signal receiving device 200. The positioning signal receiving apparatus 200 is configured to output the fourth control signal when the signal strength of the input first positioning signal is smaller than the first preset value, and output the fifth control signal when the signal strength of the input first positioning signal is smaller than the second preset value. The control circuit 150 is further configured to stop outputting the first control signal when the fourth control signal is input, and output the first control signal when the fifth control signal is input.
In this embodiment, when the current input of the positioning signal receiving device 200 is the first positioning signal, the positioning signal receiving device 200 detects the signal intensity of the first positioning signal, and outputs the fourth control signal to the control circuit 150 when the signal intensity of the first positioning signal is smaller than the first preset value, so that the control circuit 150 stops outputting the first control signal to make the switching circuit 140 stop switching the first positioning signal to the positioning signal receiving device 200 and switch the second positioning signal to the positioning signal receiving device 200; when the positioning signal receiving device 200 currently inputs the second positioning signal, the positioning signal receiving device 200 detects the signal intensity of the second positioning signal, and outputs a fifth control signal to the control circuit 150 when the signal intensity of the second positioning signal is smaller than the second preset value, so that the control circuit 150 outputs the first control signal to enable the switching circuit 140 to stop switching the second positioning signal to the positioning signal receiving device 200 and switch the first positioning signal to the positioning signal receiving device 200; therefore, when the strength of the positioning signal currently received by the positioning signal receiving apparatus 200 is weak and lower than the preset value, the signal is sent out to control the switching circuit 140 to switch another antenna circuit to input the positioning signal, so that it is ensured that the positioning signal receiving apparatus 200 can automatically switch another antenna circuit when the received positioning signal is weak. In some embodiments, the first antenna circuit 110 is disposed outside the vehicle, the second antenna circuit 120 is disposed inside the vehicle, and heads of some special vehicle models may have a severe influence on the sensitivity of the second antenna circuit 120 located inside the vehicle, so that the signal strength of the second positioning signal is deteriorated, and at this time, the positioning signal receiving device 200 can send the fifth control signal to enable the switching circuit 140 to switch to the first antenna circuit 110 to operate in time, so as to improve the accuracy of the positioning signal received by the positioning signal receiving device 200. The embodiment of the present application further provides a positioning device, which includes the positioning circuit according to any of the above embodiments, so that the positioning device according to the embodiment at least has the corresponding beneficial effects of the positioning circuit according to any of the above embodiments.
Wherein, positioner includes but not limited to vehicle event data recorder, devices that have locate function such as 4GDVR and 4G center console, when positioner applied the positioning circuit, the antenna of first antenna circuit 110 can be external outside the vehicle, the antenna of second antenna circuit 120 can be built-in the vehicle, the antenna of first antenna circuit 110 is active antenna, the antenna of second antenna circuit 120 can be active antenna also can be passive antenna, because the signal reception ability of external antenna generally can be better than built-in antenna, but external antenna has the problem that easily damages simultaneously, consequently switch to built-in antenna when external antenna circuit breaks down and can improve positioner's positioning stability.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A positioning circuit, comprising:
a first antenna circuit configured to receive a positioning satellite signal and convert the positioning satellite signal into a first positioning signal;
a second antenna circuit configured to receive the positioning satellite signal and convert the positioning satellite signal into a second positioning signal;
the detection circuit is connected with the first antenna circuit and is configured to detect the on-off of the first antenna circuit so as to generate a first detection current;
the control circuit is connected with the detection circuit and is configured to output a first control signal according to the first detection current; and
and the switching circuit is respectively connected with the control circuit, the first antenna circuit and the second antenna circuit and is configured to switch the first positioning signal to the positioning signal receiving device when the first control signal is input and switch the second positioning signal to the positioning signal receiving device when the first control signal is stopped being input.
2. The positioning circuit of claim 1, wherein the first antenna circuit comprises an active antenna, a first resistor, a second resistor, and a first capacitor; the second antenna circuit comprises a passive antenna, a third resistor, a fourth resistor and a second capacitor;
the first end of the first resistor and the first end of the first capacitor are connected in common to form a first positioning signal output end of the first antenna circuit, the second end of the first capacitor, the first end of the second resistor and the signal output end of the active antenna are connected in common to form an on-off detection end of the first antenna circuit, the second end of the first resistor, the second end of the second resistor, the first grounding end of the active antenna and the second grounding end of the active antenna are all connected with a power ground, and the active antenna is used for receiving the positioning satellite signal;
the first end of the third resistor and the first end of the second capacitor are connected in common to form a second positioning signal output end of the second antenna circuit, the second end of the second capacitor, the first end of the fourth resistor and the signal output end of the passive antenna are connected in common, the first grounding end of the passive antenna, the second grounding end of the passive antenna, the third grounding end of the passive antenna, the second end of the third resistor and the second end of the fourth resistor are connected with a power ground, and the passive antenna is used for receiving the positioning satellite signals.
3. The positioning circuit of claim 1, wherein the detection circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, and a first inductor;
a first end of the fifth resistor and a first end of the ninth resistor are connected in common and are connected with an internal power supply, a second end of the ninth resistor and an emitter of the third field effect transistor are connected, a collector of the third field effect transistor, a base of the third field effect transistor, a first end of the seventh resistor and a base of the second field effect transistor are connected in common, an emitter of the second field effect transistor, a second end of the fifth resistor, a first end of the third capacitor and a first end of the first inductor are connected in common, a collector of the second field effect transistor and a first end of the eighth resistor are connected in common, a second end of the eighth resistor, a first end of the sixth resistor and a gate of the first field effect transistor are connected in common, a drain of the first field effect transistor and a first end of the tenth resistor are connected in common to form a first detection current output end of the detection circuit, a second end of the tenth resistor is connected with a pull-up voltage power supply, a source electrode of the first field effect transistor, a second end of the sixth resistor and a second end of the seventh resistor are all connected with a power ground, and a second end of the first inductor is a first antenna circuit on-off detection end of the detection circuit.
4. The positioning circuit of claim 1, wherein the switching circuit comprises a wireless communication single-pole double-throw switch chip, a fourth capacitor, and a fifth capacitor;
the first radio-frequency signal receiving end of the wireless communication single-pole double-throw switch chip is the first positioning signal input end of the switching circuit, the second radio-frequency signal receiving end of the wireless communication single-pole double-throw switch chip is the second positioning signal input end of the switching circuit, the radio-frequency signal output end of the wireless communication single-pole double-throw switch chip is the first positioning signal output end of the switching circuit and the second positioning signal output end of the switching circuit, the control end of the wireless communication single-pole double-throw switch chip is the first control signal input end of the switching circuit, the power end of the wireless communication single-pole double-throw switch chip is connected with an internal power supply, and the grounding end of the wireless communication single-pole double-throw switch chip is connected with a power ground.
5. The positioning circuit of claim 1, wherein the positioning circuit further comprises:
and the signal modulation circuit is respectively connected with the switching circuit and the positioning signal receiving device and is configured to convert the first positioning signal or the second positioning signal into a third positioning signal and output the third positioning signal to the positioning signal receiving device.
6. The positioning circuit of claim 5, wherein the signal modulation circuit comprises a signal modulation chip, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a second inductor, a third inductor, a fourth inductor, an eleventh resistor, a signal filter, and a low noise amplifier;
the first end of the sixth capacitor is the first positioning signal input end of the signal modulation circuit and the second positioning signal input end of the signal modulation circuit, the second end of the sixth capacitor, the first end of the second inductor and the first end of the eleventh resistor are connected in common, the second end of the eleventh resistor, the first end of the third inductor and the input end of the signal filter are connected in common, the output end of the signal filter, the first end of the seventh capacitor and the first end of the fourth inductor are connected in common, the second end of the fourth inductor, the first end of the eighth capacitor and the analog quantity signal input end of the low noise amplifier are connected in common, the analog quantity signal output end of the low noise amplifier is connected with the radio frequency signal input end of the signal modulation chip, and the positioning data output end of the signal modulation chip is the third positioning signal output end of the signal modulation circuit, a first end of the ninth capacitor is commonly connected to a power source terminal of the low noise amplifier and is connected to an internal power source, and a second end of the ninth capacitor, the first ground terminal of the low noise amplifier, the second end of the second inductor, the second end of the third inductor, the first ground terminal of the signal filter, the second ground terminal of the signal filter, the third ground terminal of the signal filter, the second end of the seventh capacitor, and the second end of the eighth capacitor are all connected to a power ground.
7. The positioning circuit of claim 1, wherein the positioning circuit further comprises:
the voltage stabilizing output circuit is connected with the detection circuit and is configured to convert the voltage of the external power supply and/or the voltage of the internal power supply into a first voltage according to a second control signal and output the first voltage to supply power to the detection circuit;
the control circuit is further configured to output the second control signal.
8. The positioning circuit of claim 1, wherein the control circuit is connected to the positioning signal receiving means;
the control circuit is further configured to output the first control signal for a second time at start-up or every interval of a first time, and to stop outputting the first control signal for a third time at the end of the first time;
the positioning signal receiving device is configured to compare the signal strength of the first positioning signal at the second time with the signal strength of the second positioning signal at the third time and output a third control signal according to the comparison result;
the control circuit is further configured to output the first control signal or stop outputting the first control signal according to the third control signal.
9. The positioning circuit of claim 1, wherein the control circuit is connected to the positioning signal receiving means;
the positioning signal receiving device is configured to output a fourth control signal when the signal intensity of the input first positioning signal is smaller than a first preset value, and output a fifth control signal when the signal intensity of the input first positioning signal is smaller than a second preset value;
the control circuit is further configured to stop outputting the first control signal when the fourth control signal is input, and output the first control signal when the fifth control signal is input.
10. A positioning device comprising a positioning circuit according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021967031.1U CN212694057U (en) | 2020-09-09 | 2020-09-09 | Positioning circuit and positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021967031.1U CN212694057U (en) | 2020-09-09 | 2020-09-09 | Positioning circuit and positioning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212694057U true CN212694057U (en) | 2021-03-12 |
Family
ID=74903615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021967031.1U Active CN212694057U (en) | 2020-09-09 | 2020-09-09 | Positioning circuit and positioning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212694057U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708856A (en) * | 2021-08-13 | 2021-11-26 | 苏州翼凯通信科技有限公司 | Hand-held type basic station information and signal strength collection system |
-
2020
- 2020-09-09 CN CN202021967031.1U patent/CN212694057U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708856A (en) * | 2021-08-13 | 2021-11-26 | 苏州翼凯通信科技有限公司 | Hand-held type basic station information and signal strength collection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11444583B2 (en) | Systems and methods for optimizing amplifier operations | |
| US6118343A (en) | Power Amplifier incorporating single drain switch and single negative voltage generator | |
| US20060009164A1 (en) | Radio frequency switching circuit | |
| US7675359B2 (en) | Switch-around low noise amplifier | |
| US20140206301A1 (en) | Transceiver with an integrated rx/tx configurable passive network | |
| EP0854569A1 (en) | High-frequency power amplifier | |
| KR20150024797A (en) | Bias-boosting bias circuit for radio frequency power amplifier | |
| KR20090123782A (en) | Low noise receiving apparatus | |
| CN212694057U (en) | Positioning circuit and positioning device | |
| CN112649816A (en) | Positioning circuit and positioning device | |
| CN108306623A (en) | Low-noise amplifier | |
| US10715093B2 (en) | Power amplifier module | |
| US6529067B2 (en) | Power saving circuit for wireless pointer | |
| CN113131875B (en) | High-reliability low-noise amplifier | |
| US10804861B2 (en) | Power amplification module, method for controlling power amplification module, and high-frequency front end circuit | |
| CN110768638B (en) | Single voltage controlled electrically controlled attenuation circuit and amplitude stabilizing device | |
| US8498576B2 (en) | Inverse-mode bipolar transistor radio-frequency switches and methods of using same | |
| CN206364773U (en) | Low-noise amplifier | |
| CN108632654B (en) | Signal switching circuit and front-end circuit | |
| CN114039555B (en) | Power amplification system and radio frequency front end module | |
| CN218352499U (en) | Radio communication front-end circuit device | |
| CN211046872U (en) | Transmission line direct current bias structure capable of optimizing noise coefficient | |
| CN212210953U (en) | Low noise amplifier and radio frequency receiver | |
| US11394353B2 (en) | Power amplifier circuit | |
| CN100544215C (en) | Use single cabling to transmit the wireless telecommunication system of signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |