CN105162485A - Frequency hopping communication circuit - Google Patents
Frequency hopping communication circuit Download PDFInfo
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- CN105162485A CN105162485A CN201510454532.7A CN201510454532A CN105162485A CN 105162485 A CN105162485 A CN 105162485A CN 201510454532 A CN201510454532 A CN 201510454532A CN 105162485 A CN105162485 A CN 105162485A
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Abstract
The invention provides a frequency hopping communication circuit, which comprises a first single-chip microcomputer, a transmitting antenna, a second single-chip microcomputer, an antenna matching circuit, a receiving antenna which is electrically connected with the antenna matching circuit, a signal transmitting circuit and a signal receiving circuit, wherein the signal transmitting circuit is electrically connected with the first single-chip microcomputer and the transmitting antenna; and the signal receiving circuit is electrically connected with the second single-chip microcomputer and the antenna matching circuit. Signal frequencies of a frequency-adjustable transmitting module and a frequency-adjustable receiving module are adjusted by the single-chip microcomputers, and a failure of a remote controller due to same frequency interference is avoided; and the frequency hopping communication circuit is applicable to a vehicle keyless entry system and other remote control equipment.
Description
Technical field
The application relates to wireless communication field, particularly relates to the radio communication circuit of the anti-co-channel interference of a kind of frequency hopping.
Background technology
Along with science and technology is constantly updated and development, remote controller is widely used in automotive keyless entering system.Existing automobile remote controllers all uses single-frequency to communicate, and modulates, be then sent to vehicle after the control command such as to open the door, close the door encryption in superfrequency (UHF:UltraHighFrequency) frequency range.The UHF receiving element of vehicle, after receiving UHF signal, first demodulates data, and then calculates control command by decipherment algorithm from UHF signal, if meet the ID of oneself rule, then performs and opens, the action such as to close the door.
As shown in Figure 1, general underwater acoustic remote control circuit is made up of remote controller and vehicle end equipment.Conventional remote controller is made up of devices such as single-chip microcomputer, sound table resonator, antenna-matching circuit, transmitting antennas usually, produces resonance, antenna-matching circuit conversion resonance signal by single-chip microcomputer triggering sound table resonator, and then drives transmitting antenna to send signal.The device such as the single-chip microcomputer composition that vehicle end equipment comprises reception antenna, antenna-matching circuit, fixed frequency receiving circuit, band software unstring function, the signal received by reception antenna by antenna-matching circuit and fixed frequency receiving circuit is converted to digital electric signal and is sent to single-chip microcomputer and carries out data processing.Because sound table resonator can only produce resonance frequency, therefore a fixing frequency can only be used to launch, therefore, receiving equipment also can only use the receiver mated with this fixed frequency to receive.The signal received is serial data, uses software to read, then carry out serioparallel exchange in single-chip microcomputer.
As can be seen from Figure 1, the place be the most easily interfered is exactly when remote controller is wirelessly transmitted to vehicle end equipment.No matter remote controller uses AM modulation or FM modulation, transfer of data is carried out owing to only using single-frequency, interference when the external world is also in this frequency, it exceedes on the impact of receiving terminal the intensity that receiving terminal place transmits, the normal demodulation of remote control reception module will be affected, can not get correct data, thus correct ID cannot be decrypted, cause vehicle can not perform switch gate instruction.
In the high frequency communications of automotive keyless entering system, usually adopt the technology of fixing a certain frequency, general frequency of utilization is 315MHz, 433.92MHz, 434.42MHz etc.But because automobile environment for use is relatively wider, situation more complicated, when the frequency of a certain passage is interfered, its high frequency communications will be obstructed, and causes the situation that cannot enter vehicle He cannot lock a door.What is more, and some robber can use the interference unit of a certain frequency, and interference remote controlled locking, makes car door normally lock, steal the property in car.
Summary of the invention
Present applicant proposes a kind of frequency hopping communications circuit, it effectively improves the reliability of communication, solves the communication caused because single-frequency is interfered and hinders.
For achieving the above object, this application provides a kind of frequency hopping communications circuit, it comprises the first single-chip microcomputer and transmitting antenna, and second singlechip, antenna-matching circuit and the reception antenna that is electrically connected with antenna-matching circuit, also comprise signal transmission circuit and signal receiving circuit, signal transmission circuit and the first described single-chip microcomputer, transmitting antenna are electrically connected, and signal receiving circuit and described second singlechip, antenna-matching circuit are electrically connected.
Signal transmission circuit in the application can by a SPI interface, the first register and go here and there conversion circuit, the first phase-locked loop circuit, antenna drive circuit be electrically connected form, a SPI interface and the first single-chip microcomputer, the first register are electrically connected; And go here and there one end of conversion circuit and the first register and be electrically connected, its other end is provided with the first phase-locked loop circuit; One end of first phase-locked loop circuit is provided with antenna drive circuit, and antenna drive circuit and transmitting antenna are electrically connected.
Or described signal transmission circuit also can be the high-frequency emission chip with digital phase-locked loop, this high-frequency emission chip and the first single-chip microcomputer, transmitting antenna are electrically connected.
Signal receiving circuit in the application can also conversion circuit, the second phase-locked loop circuit, interrupt circuit, the 2nd SPI interface be electrically connected and form by the second register, string, second phase-locked loop circuit and antenna-matching circuit are electrically connected, and string also conversion circuit and the second register is electrically connected; One end of second register is provided with interrupt circuit, the other end is provided with the 2nd SPI interface, interrupt circuit and the 2nd SPI interface are electrically connected, and interrupt circuit, the 2nd SPI interface are also electrically connected with second singlechip.
Moreover described signal receiving circuit also can be the high-frequency reception chip with digital phase-locked loop, this high-frequency reception chip and second singlechip, antenna-matching circuit are electrically connected.
This kind of frequency hopping communications circuit that the application provides, it realizes frequency hopping communication by signal transmission circuit and signal receiving circuit, improves the reliability of communication; Meanwhile, signal receiving circuit, only after the data receiving and design ID coupling, is just waken second singlechip up by interrupt circuit, is made receiving circuit more power saving like this.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram that the use single-frequency of prior art in automotive keyless entering system carries out communicating;
Fig. 2 is the circuit module connection diagram of the application;
Fig. 3 is the communication succession figure of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
As shown in Figure 2, a kind of frequency hopping communications circuit that the application provides, it comprises the first single-chip microprocessor MCU 1 and transmitting antenna 101, and second singlechip MCU2, antenna-matching circuit 202 and the reception antenna 201 that is electrically connected with antenna-matching circuit 202, also comprise signal transmission circuit 10 and signal receiving circuit 20, signal transmission circuit 10 and the first described single-chip microprocessor MCU 1, transmitting antenna 101 are electrically connected, and signal receiving circuit 20 and described second singlechip MCU2, antenna-matching circuit 202 are electrically connected.
Concrete, the first described single-chip microprocessor MCU 1 and transmitting antenna 101, and second singlechip MCU2, antenna-matching circuit 202 and reception antenna 201, above-mentioned each module all can be configured according to prior art.Signal transmission circuit 10 receives the action command from the first single-chip microprocessor MCU 1 and modulates, thus drives transmitting antenna 101 to send high-frequency communication signal; Meanwhile, reception antenna 201 receives the signal that transmitting antenna 101 sends, and is passed to signal receiving circuit 20 by antenna-matching circuit 202 and carries out demodulation, and the signal after demodulation is sent to second singlechip MCU2 and then is converted to action command and controls peripheral equipment.
Especially, signal transmission circuit 10 in the application can be electrically connected by several circuit module and form, as shown in Figure 2, described signal transmission circuit 10 comprise SPI interface 104, first register 105 and and go here and there conversion circuit 106, a SPI interface 104 and the first single-chip microprocessor MCU 1, first register 105 are electrically connected; And go here and there one end of conversion circuit 106 and the first register 105 and be electrically connected, its other end arranges the first phase-locked loop circuit 107; Arrange antenna drive circuit 102 in one end of the first phase-locked loop circuit 107, antenna drive circuit 102 and transmitting antenna 101 are electrically connected, and above-mentioned each circuit module can carry out selection according to prior art and arrange.
Or, as the another kind of selectivity embodiment of the application, signal transmission circuit in the application also can be the high-frequency emission chip (not shown) with digital phase-locked loop, specifically, can be but the model being not limited to En Zhi Pu semiconductor company is the chip of PCF7900.By the configuration to PCF7900, can launch multiple frequency, by the register in single-chip microcomputer configuring high-frequency transmitting chip, the UHF signal of launching and receiving end frequency match, modulation can adopt AM to modulate or FM modulation.Adopt the high-frequency emission chip of high integration can save space, simplified wiring.
Concrete, signal receiving circuit 20 in the application can be electrically connected by several circuit module and form, as shown in Figure 2, described signal receiving circuit 20 comprises the second register 206, string conversion circuit 207 and with string and the second phase-locked loop circuit 208 of being electrically connected of conversion circuit 207, second phase-locked loop circuit 208 is electrically connected with antenna-matching circuit 202, and string also conversion circuit 207 and the second register 206 is electrically connected; Arrange interrupt circuit 204 in one end of the second register 206, arrange the 2nd SPI interface 205 at the other end, interrupt circuit 204 and the 2nd SPI interface 205 are electrically connected, and interrupt circuit 204, the 2nd SPI interface 206 are also electrically connected with second singlechip MCU2.Above-mentioned each circuit module can carry out selection according to prior art and arrange.
Or as the another kind of selectivity embodiment of the application, the signal receiving circuit 20 in the application also can be the high-frequency reception chip with digital phase-locked loop, specifically, can be but the model being not limited to company of Infineon is the chip of TDA5230.By configuring this chip, chip can be made only after the data receiving and design ID coupling, just wake second singlechip MCU2 up by interrupt routine, then single-chip microcomputer reads other enciphered datas in this chip by the 2nd SPI interface 205, signal receiving circuit 20 more power saving can be made like this, meanwhile, the high-frequency reception chip of high integration can simplified wiring, easy to use.TDA5230, by its register of configuration adjustment receive frequency, makes frequency modulation communication be achieved.
Further, by the first single-chip microprocessor MCU 1 control signal radiating circuit 10, can realize the frequency-modulated wave sending multiple frequency successively, the number of frequencies sent can be arranged according to the needs of device used and practice environment.And signal receiving circuit 20 guarantees the signal receiving a certain frequency that transmitting antenna 101 is launched by sliding time window, as shown in Figure 3, by arranging internal high frequency receiving chip, make it in the 1st timeslice t, be operated in f1 frequency, 2nd timeslice t is operated in f2 frequency, 3rd timeslice t is operated in f3 frequency, the like, n-th timeslice t is operated in fn frequency, can ensure that the high frequency transmission signal of no matter transmitting antenna 101 is in which frequency, normally can both receive its signal sent like this.Signal transmission circuit 10 then needs to ensure that transmitting antenna 101 is at f1, f2, f3 ..., fn frequency cycle is launched, and the timeslice T that each circulation is launched is greater than the summation of n high-frequency reception timeslice t.Too smallly cause co-channel interference for avoiding being separated by between frequency, preferably, any separation of two frequencies △ f is greater than 2MHz.In addition, receive window can interval flexibly between regulation time sheet t parameter and each timeslice, can reach the object of power saving.The application enters in systematic difference at vehicle key-free, and general use 3 frequencies can realize anti-tampering function.
The application can on the basis ensureing reliability, the communication frequency of signal transmission circuit 10 and signal receiving circuit 20 is adjusted by the first single-chip microprocessor MCU 1, second singlechip MCU2, effectively prevent the inefficacy that co-channel interference causes communication, be applicable to being used in vehicle key-free and enter in system and other remote control equipments.
Claims (2)
1. a frequency hopping communications circuit, it comprises the first single-chip microcomputer (MCU1) and transmitting antenna (101), and second singlechip (MCU2), antenna-matching circuit (202) and the reception antenna (201) be electrically connected with antenna-matching circuit (202), it is characterized in that, also comprise signal transmission circuit (10) and signal receiving circuit (20), signal transmission circuit (10) and described the first single-chip microcomputer (MCU1), transmitting antenna (101) is electrically connected, signal receiving circuit (20) and described second singlechip (MCU2), antenna-matching circuit (202) is electrically connected.
2. a kind of frequency hopping communications circuit according to claim 1, it is characterized in that: described signal transmission circuit (10) comprise a SPI interface (104), the first register (105) and and go here and there conversion circuit (106), a SPI interface (104) and the first single-chip microcomputer (MCU1), the first register (105) are electrically connected; And go here and there one end of conversion circuit (106) and the first register (105) and be electrically connected, its other end is provided with the first phase-locked loop circuit (107); One end of first phase-locked loop circuit (107) is provided with antenna drive circuit (102), and antenna drive circuit (102) and transmitting antenna (101) are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510454532.7A CN105162485A (en) | 2015-07-30 | 2015-07-30 | Frequency hopping communication circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510454532.7A CN105162485A (en) | 2015-07-30 | 2015-07-30 | Frequency hopping communication circuit |
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| Publication Number | Publication Date |
|---|---|
| CN105162485A true CN105162485A (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510454532.7A Pending CN105162485A (en) | 2015-07-30 | 2015-07-30 | Frequency hopping communication circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649970A (en) * | 2018-07-09 | 2018-10-12 | 上海实业交通电器有限公司 | A kind of automobile key frequency hopping RKE dual-band antennas |
| CN114531162A (en) * | 2022-01-26 | 2022-05-24 | 广州小鹏汽车科技有限公司 | Method, device, equipment and storage medium for reducing interference of vehicle key |
-
2015
- 2015-07-30 CN CN201510454532.7A patent/CN105162485A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649970A (en) * | 2018-07-09 | 2018-10-12 | 上海实业交通电器有限公司 | A kind of automobile key frequency hopping RKE dual-band antennas |
| CN114531162A (en) * | 2022-01-26 | 2022-05-24 | 广州小鹏汽车科技有限公司 | Method, device, equipment and storage medium for reducing interference of vehicle key |
| CN114531162B (en) * | 2022-01-26 | 2024-03-08 | 广州小鹏汽车科技有限公司 | Method, device, equipment and storage medium for reducing interference of keys for vehicles |
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Application publication date: 20151216 |