CN206164517U - Automobile -used self -adaptation receive demodulate device - Google Patents

Abstract

The utility model discloses an automobile -used self -adaptation receive demodulate device belongs to vehicle communication technology field, and the device has adopted the ASKFSK demodulator with prior art's difference, carries out ASK to the detected signal by turns through the ASKFSK demodulator and separates the demodulation of mediation FSK, and the treater obtains the wave form that the detected signal obtained through the preliminary demodulation of different demodulation standards by turns to carry out the demodulation standard of comparison in order to confirm the detected signal with the expected value of guidance code. The remote control signal through receiving remote control key ASK standard simultaneously and the tire pressure signal of tire pressure monitored control system FSK standard to through tentatively separate the correct demodulation standard of transferring to confirm the detected signal to the received detected signal, the self -adaptation demodulation between ASK demodulation standard and the FSK demodulation standard has been realized.

Description

Automotive self-adapting receives demodulating equipment

Technical field

The utility model is related to vehicle communication technical field, and more particularly to a kind of automotive self-adapting receives demodulating equipment.

Background technology

At present, the passenger car on market is almost equipped with wireless remote controlled keys system, automobile-used wireless remote controlled keys system Operating frequency great majority be 433.92MHz, and most key code uses ASK modulation mode, only minority Vehicle uses FSK modulation mode.And, with the reliability to vehicle, the raising of security requirement, exist in the near future Tire pressure monitoring system is installed on vehicle will be popularized, and this is also needed while also implying that and remote-control key is installed on same chassis Tire pressure monitoring system is installed.And the frequency being wirelessly transferred that tire pressure monitoring system is used similarly is 433.92MHz, signal Modulation system then includes two classes, and a class is ASK modulation mode, and another kind of is FSK modulation mode, and with FSK modulation mode residence It is many.Therefore, if the signal modulation mode of remote control key system is consistent with the signal modulation mode of tire pressure monitoring system, i.e., All be ASK modulation mode or be all FSK modulation mode, then the two systems can share a secondary reception antenna, one connect Collection of letters road, a reception chip and a kind of demodulation mode, it is possible to realize that two systems comprehensively use a receiving unit or mould Block.

But, existing most of car load factories carry for two functions of remote-control key and tire pressure monitoring simultaneously on same chassis Two sets of each independent systems are supplied, a set of key signal for receiving ASK modulation is another set of for receiving FSK modulation Tire pressure monitoring signal.This design need two sets of systems have respective reception antenna, receiving circuit plate, independent installation structure, Special purpose interface and wire harness etc..Have the obvious disadvantage that：One is, two sets of each independent systems is designed, when remote control key system When signal modulation mode is consistent with the signal modulation mode of tire pressure monitoring system, then set of system is had in idle state, make Into the waste of resource；Two are, due to needing to install two sets of each independent systems in same chassis, increased the making of product Cost and the cost of car load assembling；Three are, because the key code of most of vehicles in the market uses ASK modulation methods Formula, in the near future the remote-control key of part vehicle may be using the existing ASK standards key of FSK modulation mode replacement.By Can cause ASK receiving units and the FSK receiving units can not be general in the standard difference of demodulation, produce in new, old remote-control key in the future When product replace, the receiving unit of different modulating standard may be also occurred in a vehicle, this can cause spare and accessory parts factory, whole Depot's assembling, lower lines matching and 4S shops cause confusion.

Utility model content

The purpose of this utility model is to provide a kind of automotive self-adapting to receive demodulating equipment, to overcome prior art in need The problem to be equipped with each independent system for wireless remote controlled keys system and tire pressure monitoring system on same chassis.

To realize object above, the technical solution adopted in the utility model is：A kind of automotive self-adapting is provided and receives demodulation Device, the device includes antenna, radio frequency amplifier, frequency mixer, intermediate frequency amplifier, PLL phaselocked loops, processor and amplitude-shift keying ASK demodulation/frequency shift keying fsk demodulators；Radio frequency amplifier is connected the detection signal so that antenna to be received with antenna and amplifies, and mixes Frequency device is connected respectively detection signal and PLL after the amplification so that radio frequency amplifier to be exported with radio frequency amplifier and PLL phaselocked loops The local oscillation signal that phaselocked loop is sent into sends into intermediate frequency amplifier after being mixed；Intermediate frequency amplifier is according to the mixed frequency signal meter for receiving The carrier signal strength of the detection signal for receiving or with interior signal to noise ratio and intermediate frequency amplifier is in carrier signal or with interior noise Control processor enters demodulation working condition when one of which than in reaches predetermined threshold value；Processor enters demodulation working condition The demodulation path opened afterwards in ASK/FSK demodulators carries out preliminary demodulation to detection signal to control ASK/FSK demodulators, processes Device from ASK/FSK demodulators rotation obtain ASK demodulation standard and FSK demodulation standard after waveform, processor by obtain Waveform carries out contrasting the modulation system for determining detection signal respectively with preset desired value.

Compared with prior art, there is following technique effect in the utility model：The utility model passes through ASK/FSK demodulators Detection signal to receiving carries out respectively ASK demodulation standard demodulation FSK demodulation standard demodulation, and detection signal here includes The remote signal of remote-control key ASK standards and the tire pressure signal of tire pressure monitoring system FSK standards and reception remote-control key FSK systems The remote signal of formula, processor is acquired to the waveform obtained after two kinds of modulation system demodulation in ASK/FSK demodulators, then locates Reason device two kinds of demodulation standards is demodulated the waveform for the obtaining desired value preset with its and compared, the waveform that will be more conformed to desired value Demodulation standard be defined as the demodulation standard of detection signal, just the demodulation standard can be selected to inspection by the control port of processor The partial data string for surveying signal is demodulated.Therefore, the automotive self-adapting that the utility model is provided receives demodulating equipment can be simultaneously Receive remote signal, the tire pressure signal of tire pressure monitoring system FSK standards and the reception remote-control key of remote-control key ASK standards The remote signal of FSK standards, and carry out preliminary demodulation to determine the correct of detection signal by the detection signal to receiving Demodulation standard, realizes the adaptive demodulation between ASK demodulation standards and FSK demodulation standards, i.e., come on same covering device Into the demodulation of the demodulation FSK standard signals of ASK standard signals, and extra hardware cost need not be increased.

Description of the drawings

Fig. 1 is the structural representation that the automotive self-adapting in an embodiment receives demodulating equipment；

Fig. 2 is the scheme of installation that the automotive self-adapting in an embodiment receives demodulating equipment.

Specific embodiment

With reference to Fig. 1 to Fig. 2, the utility model is described in further detail.

Receive demodulating equipment refering to a kind of automotive self-adapting shown in Fig. 1, is present embodiments provided, the device include antenna, Radio frequency amplifier, frequency mixer, intermediate frequency amplifier, PLL phaselocked loops, processor and amplitude-shift keying ASK demodulation/frequency shift keying fsk Demodulator；

Radio frequency amplifier is connected the detection signal so that antenna to be received with antenna and amplifies, and frequency mixer amplifies respectively with radio frequency The local oscillator letter that detection signal and PLL phaselocked loops after the amplification that device and PLL phaselocked loops connect to export radio frequency amplifier is sent into Intermediate frequency amplifier is sent into after number being mixed；

Intermediate frequency amplifier calculates the carrier signal strength or band of the detection signal for receiving according to the mixed frequency signal for receiving The interior signal to noise ratio and intermediate frequency amplifier control process in carrier signal or when reaching predetermined threshold value with the one of which in interior signal to noise ratio Device enters demodulation working condition；

Processor is entered to be opened the demodulation path in ASK/FSK demodulators to control ASK/FSK solutions after demodulation working condition Adjust device that preliminary demodulation is carried out to detection signal, processor obtains ASK demodulation standards and FSK from rotation in ASK/FSK demodulators Waveform after demodulation standard, processor carries out the waveform of acquisition with preset desired value to contrast the tune for determining detection signal respectively Mode processed.

Automotive self-adapting in the present embodiment receive demodulating equipment circuit structure can with it is integrated on one chip, the collection There is ASK demodulation functions and FSK demodulation functions into chip, by the control port of chip ASK can be selected to demodulate standard or FSK Demodulate standard and the port outgoing carrier signal intensity indication signal of chip can be passed through and with interior signal-noise ratio signal.Here There is ASK/FSK demodulators ASK demodulation functions also to have FSK demodulation functions.

Specifically, it is built-in with reference frequency oscillator in PLL phaselocked loops.The reference signal that reference frequency oscillator is produced The stability of PLL phaselocked loops can be improved as a reference value, PLL phaselocked loops can be produced and remote-control key signal according to a reference value The corresponding high precision local oscillation signal of frequency/tire pressure detection signal frequency, produced by PLL phaselocked loops here with remote-control key signal Frequency/corresponding local oscillation signal of tire pressure detection signal frequency is 433.92-10.7MHz.

In actual applications, as shown in Fig. 2 the automobile-used adaptive reception demodulating equipment in above-described embodiment is arranged on into compartment It is interior.It is specifically as follows using process：

(1) sensor of tire pressure monitoring system is arranged in wheel tire, during vehicle wheel rotation or after rotation stopping, every tire Interior sensor sends out tire pressure serial data, now automotive self-adapting receive demodulating equipment in antenna just can receive from The key chain code of remote-control key and the tire pressure serial data from four wheels in user's hand；

(2) antenna transmits the detection signal of reception to intermediate frequency amplifier Jing after radio frequency amplifier, the process of frequency mixer, in Audio amplifier obtains carrier signal strength or with interior signal to noise ratio according to the carrier signal that frequency mixer is exported, and when carrier signal is strong Degree or with any one of interior signal to noise ratio exceed reach threshold value when, control process device enters demodulation state.

(3) processor is entered after demodulation state, and the ASK demodulation paths in ASK/FSK demodulators, ASK/FSK are opened in control Demodulator does ASK demodulation to obtain demodulation waveforms to former positions of serial data guiding frame in carrier signal, and processor is beaten again immediately FSK demodulation paths are opened, ASK/FSK demodulators do FSK demodulation to be solved to former positions of serial data guiding frame in carrier signal Harmonic shape, processor gathers the waveform that two kinds of demodulation standard demodulation are obtained, and then processor demodulates standard by collect two kinds The waveform and dutycycle for obtaining is compared with the desired value of guidance code, by the demodulation of the waveform being closer to desired value Formula is defined as the correct demodulation standard of detection signal；

(4) after the demodulation standard that processor determines detection signal, the code of frame is guided according to detection signal partial data string Rate judging the serial data for remote-control key data or tire pressure system data, specifically, by code check 800～2000bps it Between judgement be remote-control key data, judgement of the code check between 2400～6400bps be tire pressure system data.

Therefore, the automotive self-adapting that the present embodiment is provided receives demodulating equipment can not consider that the data for receiving are used Which kind of modulation classification, can distinguish the modulation of the detection signal of reception after secondary receiving data carries out rotation demodulation contrast Standard, so as to realize adaptive de conditioning function.But also it can be distinguished to received data string come from remote-control key also It is tire pressure monitoring system, so as to improve the confidence level that automotive self-adapting receives demodulating equipment.

Explanation is needed exist for, the main thought of scheme is different by rotation acquisition detection signal Jing in the present embodiment The waveform that demodulation standard preliminary demodulation is obtained, and the demodulation of detection signal is compared to determine with the desired value of guidance code Formula.

It should be noted that the guidance code referred in the present embodiment is the targeting signal of Frame, generally 50% duty Than, baud rate for desired value square-wave signal, about 200～400 waveforms of guidance code.Remote-control key guidance code baud rate Desired value is 1000 ± 20%bit/s (to meet desired value i.e. between 800～1200bit/s), and tire pressure monitoring system data are drawn The desired value of leading code baud rate is 4800 ± 20%bit/s, that is to say, that detection signal Jing is different, and demodulation standard preliminary demodulation is obtained To the baud rate of waveform be treated as meeting desired value between 3840～5760bit/s.Further, judge in the present embodiment Whether the baud rate of the waveform that the different demodulation standard preliminary demodulations of detection signal Jing are obtained meets the desired value needs of guidance code is sentenced Break 3～4 wave periods.

Claims (3)

1. a kind of automotive self-adapting receives demodulating equipment, it is characterised in that：Put including antenna, radio frequency amplifier, frequency mixer, intermediate frequency Big device, PLL phaselocked loops, processor and amplitude-shift keying ASK/ frequency shift keying fsk demodulators；

Radio frequency amplifier is connected detection signal so that antenna to be received with antenna and amplifies, frequency mixer respectively with radio frequency amplifier and The local oscillation signal that detection signal and PLL phaselocked loops after the amplification that PLL phaselocked loops connect to export radio frequency amplifier is sent into enters Intermediate frequency amplifier is sent into after row mixing；

Intermediate frequency amplifier calculates the carrier signal strength of the detection signal for receiving or with interior letter according to the mixed frequency signal for receiving Make an uproar than and intermediate frequency amplifier in carrier signal or when reaching predetermined threshold value with the one of which in interior signal to noise ratio, control processor enters Enter to demodulate working condition；

Processor is entered to be opened the demodulation path in ASK/FSK demodulators to control ASK/FSK demodulators after demodulation working condition Preliminary demodulation is carried out to detection signal, processor obtains ASK demodulation standards and FSK demodulation from rotation in ASK/FSK demodulators Waveform after standard, processor carries out the waveform of acquisition with preset desired value to contrast the modulation methods for determining detection signal respectively Formula.

2. automotive self-adapting as claimed in claim 1 receives demodulating equipment, it is characterised in that：It is interior in described PLL phaselocked loops It is equipped with reference frequency oscillator.

3. automotive self-adapting as claimed in claim 1 receives demodulating equipment, it is characterised in that：Automobile-used adaptive reception demodulating equipment In compartment.