CN105629223A - Mobile terminal and measurement method thereof - Google Patents
Mobile terminal and measurement method thereof Download PDFInfo
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- CN105629223A CN105629223A CN201510971565.9A CN201510971565A CN105629223A CN 105629223 A CN105629223 A CN 105629223A CN 201510971565 A CN201510971565 A CN 201510971565A CN 105629223 A CN105629223 A CN 105629223A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
- G01S13/583—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets
- G01S13/584—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets adapted for simultaneous range and velocity measurements
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The embodiment of the invention discloses a mobile terminal and a measurement method thereof. The mobile terminal comprises a frequency modulation signal processing module, a diplexer, an antenna and a baseband IC, wherein the frequency modulation signal processing module comprises a frequency modulation signal generating unit, a coupler and a frequency mixer; frequency modulated continuous wave (FMCW) signals generated by the frequency modulation signal generating unit are generated into two ways of signals via the coupler, the first way of signals is transmitted via the antenna connected with the diplexer, signals reflected by a target object of the first way of signals serve as output signals of the diplexer to be transmitted to the frequency mixer, the second way of signals are transmitted together with the output signals of the diplexer to the frequency mixer, and intermediate frequency signals after frequency mixing of the frequency mixer are inputted to the baseband IC. Through the technical scheme provided by the embodiment of the invention, a measurement method based on the FMCW is provided for the mobile terminal, and as the FMCW signal has the characteristics of strong penetrability, high resolution and the like, the measurement precision is improved.
Description
Technical field
The present embodiments relate to radar surveying field, particularly relate to a kind of mobile terminal and measuring method thereof.
Background technology
Along with the fast development of mobile terminal technology, the mobile terminal of such as smart mobile phone and panel computer etc has been widely used for the every field of work and life.
At present, what mobile terminal was conventional test the speed, ranging scheme has ultrasonic ranging, infrared distance measuring and GPS/AGPS auxiliary test the speed range finding etc. Not possessing the penetration capacity to misty rain weather yet with infrared ray/ultrasound wave/GPS, and volume is big, wave beam is not concentrated, and therefore usable range is extremely limited, it is difficult to realize remote monitoring, causes that the certainty of measurement of mobile terminal is relatively low, it is impossible to meet user's request.
Summary of the invention
The present invention provides a kind of mobile terminal and measuring method thereof, to improve the certainty of measurement of mobile terminal.
On the one hand, embodiments provide a kind of mobile terminal, including FM signal processing module, duplexer, antenna and baseband I C, wherein:
Described FM signal processing module includes FM signal generation unit, bonder and frequency mixer, the Continuous Wave with frequency modulation FMCW signal that described FM signal generation unit generates generates two paths of signals through bonder, the described antenna that first via signal connects through described duplexer is launched, the signal that first via signal is reflected by target object flows to frequency mixer as the output signal of described duplexer, second road signal flows to described frequency mixer together with the output signal of described duplexer, and the intermediate-freuqncy signal after described frequency mixer is mixed inputs to described baseband I C.
On the other hand, embodiments provide the measuring method of a kind of mobile terminal, including:
The second road signal that the FMCW signal that FM signal generation unit is generated by frequency mixer generates through bonder, it is mixed with the reflected signal of target object, with the intermediate-freuqncy signal after being mixed, the reflected signal of wherein said target object is the first via signal that the FMCW signal that FM signal generation unit generates generates through bonder, after the antenna transmitting that duplexer connects, the signal reflected by target object;
Baseband I C obtains the intermediate-freuqncy signal after frequency mixer mixing, and described target object carries out distance or tachometric survey according to described intermediate-freuqncy signal.
The technical scheme that the embodiment of the present invention provides, Continuous Wave with frequency modulation signal is generated by the FM signal generation unit in mobile terminal, Continuous Wave with frequency modulation signal is converted to through bonder first via signal and the second road signal, the antenna that first via signal connects through duplexer is launched, first via signal after transmitting is reflected by target object to be detected, signal after being reflected by target object and the second road signal are flowed to frequency mixer by duplexer together, and the intermediate-freuqncy signal after frequency mixer is mixed is inputed to the baseband I C of mobile terminal, make baseband I C that target object carry out distance or tachometric survey according to the intermediate-freuqncy signal received, namely, a kind of measuring method based on Continuous Wave with frequency modulation signal is provided for mobile terminal, due to Continuous Wave with frequency modulation signal, to have penetration power strong, the characteristics such as resolution is high, compared to existing based on ultrared measuring method, improve certainty of measurement.
Accompanying drawing explanation
The structural representation of a kind of mobile terminal that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the mobile terminal that Fig. 2 a provides for the embodiment of the present invention two;
Fig. 2 b is the structural representation of Fig. 2 a FM signal generation unit provided for the embodiment of the present invention two;
The schematic flow sheet of the measuring method of a kind of mobile terminal that Fig. 3 a provides for the embodiment of the present invention three;
The time and frequency zone FMCW signal comparison diagram that a kind of mobile terminal that Fig. 3 b provides for the embodiment of the present invention three sends/receives.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail. It is understood that specific embodiment described herein is used only for explaining the present invention, but not limitation of the invention. It also should be noted that, for the ease of describing, accompanying drawing illustrate only part related to the present invention but not entire infrastructure.
Embodiment one
The structural representation of a kind of mobile terminal that Fig. 1 provides for the embodiment of the present invention one. as shown in Figure 1, this mobile terminal includes: include FM signal processing module 11, duplexer 12, antenna 14 and baseband I C (IntegratedCircuit, integrated circuit) 13, wherein: described FM signal processing module 11 includes FM signal generation unit 111, bonder 112 and frequency mixer 113, Continuous Wave with frequency modulation (the FrequencyModulatedContinuousWave that described FM signal generation unit 111 generates, FMCW) signal generates two paths of signals through bonder 112, the described antenna 14 that first via signal connects through described duplexer 12 is launched, the signal that first via signal is reflected by target object flows to frequency mixer 113 as the output signal of described duplexer 12, second road signal flows to described frequency mixer 113 together with the output signal of described duplexer 12, intermediate-freuqncy signal after described frequency mixer 113 is mixed inputs to described baseband I C13.
In the present embodiment, described mobile terminal refers to the electronic equipment of such as smart mobile phone, panel computer or personal computer etc. Baseband I C13 is used for synthesizing armed baseband signal, or the baseband signal received is decoded. If described mobile terminal is smart mobile phone, described baseband I C13 can include CPU (CPU, CentralProcessingUnit, central processing unit) processor, channel encoder, digital signal processor, modem and interface module.
In the present embodiment, FM signal processing module 11 includes FM signal generation unit 111, bonder 112 and frequency mixer 113, the outfan of wherein said FM signal generation unit 111 is connected with the input of described bonder 112, the first input end of described bonder 112 is connected with antenna by duplexer 12, second input of described bonder 112 is connected with the first input end of described frequency mixer 113, duplexer 12 is connected with antenna 14, duplexer 12 is also connected with the second input of described frequency mixer 113, wherein FM signal generation unit 111 generates FMCW signal, the FMCW signal of generation is inputed to bonder 112, FMCW signal is divided into two paths of signals by bonder 112, the antenna 14 that first via signal is connected by duplexer 12 is launched, after the first via signal launched runs into target object to be measured, launched by target object, antenna receives the signal reflected by target object, and the signal reflected by target object is flowed to frequency mixer 113 by duplexer 12 together with the second road signal, the frequency mixer 113 signal to being reflected by target object and the second road signal carry out mixing and produce intermediate-freuqncy signal, and the intermediate-freuqncy signal of generation is inputed to baseband I C13, baseband I C13 decodes the intermediate-freuqncy signal received, thus target object being carried out distance or tachometric survey.
Optionally, described FM signal processing module 11 is arranged in the special chip (ApplicationSpecificIntegratedCircuit, ASIC) of mobile terminal. Further, described special chip can be power management chip, Cellular Networks transceiver chip, Clock management chip or WiFi (WirelessFidelity, wireless fidelity network) chip, namely, FM signal processing module can arrange in the terminal on existing power management chip, Cellular Networks transceiver chip, Clock management chip or WiFi chip, avoid the chip that extra interpolation is new in the terminal, save the cost of mobile terminal.
Optionally, the frequency band of described FMCW signal is radio amateur's service band or 2.4G/5G wireless fidelity network ISM (IndustrialScientificMedical, Radiocommunication Bureau of International Telecommunications Union) service band.
The mobile terminal that the embodiment of the present invention provides, Continuous Wave with frequency modulation signal is generated by FM signal generation unit, Continuous Wave with frequency modulation signal is converted to through bonder first via signal and the second road signal, the antenna that first via signal connects through duplexer is launched, first via signal after transmitting is reflected by target object to be detected, signal after being reflected by target object and the second road signal are flowed to frequency mixer by duplexer together, and the intermediate-freuqncy signal after frequency mixer is mixed is inputed to the baseband I C of mobile terminal, make baseband I C that target object carry out distance or tachometric survey according to the intermediate-freuqncy signal received, namely, a kind of measuring method based on Continuous Wave with frequency modulation signal is provided for mobile terminal, due to Continuous Wave with frequency modulation signal, to have penetration power strong, the characteristics such as resolution is high, compared to existing based on ultrared measuring method, improve certainty of measurement.
Embodiment two
The present embodiment provides a kind of new mobile terminal on the basis of above-described embodiment one, and for convenience of description, the parts that the present embodiment is identical with embodiment one still continue to use accompanying drawing labelling identical in embodiment one. the structural representation of a kind of mobile terminal that Fig. 2 provides for the embodiment of the present invention two. as shown in Figure 2 a, this mobile terminal includes: FM signal processing module 11, duplexer 12, antenna 14 and baseband I C13, wherein: described FM signal processing module 11 includes FM signal generation unit 111, bonder 112 and frequency mixer 113, the Continuous Wave with frequency modulation FMCW signal that described FM signal generation unit 111 generates generates two paths of signals through bonder 112, the described antenna 14 that first via signal connects through described duplexer 12 is launched, the signal that first via signal is reflected by target object flows to frequency mixer 113 as the output signal of described duplexer 12, second road signal flows to described frequency mixer 113 together with the output signal of described duplexer 12, intermediate-freuqncy signal after described frequency mixer 113 is mixed inputs to described baseband I C13. with above-described embodiment one the difference is that, described FM signal processing module 11 also includes power amplifier (PowerAmplifier, PA) the 114, first narrow band filter 115 and the second narrow band filter 116, the FMCW signal that wherein said FM signal generation unit 11 generates inputs to described bonder 112 by PA114 and the first narrow band filter 115, intermediate-freuqncy signal after described frequency mixer 113 is mixed inputs to described baseband I C13 through the second narrow band filter 116. optionally, described FM signal processing module 11 is arranged in the special chip (ApplicationSpecificIntegratedCircuit, ASIC) of mobile terminal.
In the present embodiment, this FM signal generation unit 111 is controlled by baseband I C13, generation meets frequency, the FMCW signal that phase and amplitude requires, by PA114, first narrow band filter 115 and bonder 112 generate two paths of signals, first via signal is launched directly as TX signal, TX signal is met target object (i.e. barrier) to be detected and is produced Doppler frequency shift afterwards, signal after being reflected by target object is through duplexer 12, low-noise amplifier (LowNoiseAmplifier, LNA) 14 and the 3rd after narrow band filter 15 as the demodulation signal of frequency mixer 113, second road signal is as the LO (LocalOscillator of frequency mixer 113, local oscillator) signal. so obtain intermediate-freuqncy signal after demodulation signal and local oscillation signal mixing, wherein contain relative velocity and/or the relative distance information of target object and mobile terminal in intermediate-freuqncy signal, after baseband I C13 receives intermediate-freuqncy signal, demodulate relative velocity and/or the relative distance information of target object and mobile terminal, it is achieved thereby that target object is carried out speed and/or range measurement by mobile terminal.
As shown in Figure 2 b, preferably, described FM signal generation unit includes Direct Digital Synthesizer (DirectDigitalSynthesizer, DDS) 1111 and phaselocked loop (PhaseLockedLoop, PLL) 1112, wherein the input of DDS1111 receives reference signal f from external crystal oscillatorc, by described reference signal fcSynthesizing Direct Digital frequency signal, described Direct Digital frequency signal is inputed to PLL1112, make PLL1112 generate FMCW signal, it is little that above-mentioned FM signal generation unit has volume, it is easy to the advantage such as integrated. PLL1112 mainly includes phase discriminator (PhaseDetector, PD), loop filter (LoopFilter, LPF) and voltage directly encourage voltage controlled oscillator (Voltage-ControlledOscillator, VCO), the output signal of DDS will directly encourage after machine PLL circuit, and bandwidth will extension N times. In this FM signal generation unit, for the FMCW signal that frequency is relatively low, directly can be exported by DDS; For higher frequency band apply, the output signal of DDS will directly encourage rear class PLL circuit can, after PLL frequency multiplication export. Reference signal fcThered is provided by external crystal oscillator.
It should be noted that, the structure of FM signal generation unit is not especially limited by the present embodiment, only need to produce FMCW signal, as utilized digital signal processor (DigitalSignalProcessor, and digital analog converter (Digitaltoanalogconverter DSP), etc. DAC) digital device produces Linear Triangular ripple, and VCO produces base band FMCW signal, generally also adopts PLL, doubler, frequency mixer to export to obtain higher frequency section. In order to improve the linearity of the FMCW signal that the method obtains, it is also possible to add rear class linearity circuit.
The mobile terminal that the embodiment of the present invention provides, based on DDS and PLL, can build high performance FMCW signal. And along with the development of semiconductor technology, can integrated DDS/PLL module inside ASIC; TX antenna can share with WIFI antenna etc., and peripheral components designs only duplexer, LNA etc.; The demodulation of FMCW signal completes in baseband I C; Scheme is simply easily achieved. As such, it is possible under the premise of minimal hardware expense, it is thus achieved that the range finding application of testing the speed of FMCW.
3rd embodiment
The schematic flow sheet of the measuring method of a kind of mobile terminal that Fig. 3 a provides for the embodiment of the present invention three, the mobile terminal that the method can be provided by above-described embodiment one or embodiment two performs. As shown in Figure 3 a, this realizes flow process and includes:
The second road signal that the FMCW signal that FM signal generation unit is generated by step 31, frequency mixer generates through bonder, it is mixed with the reflected signal of target object, with the intermediate-freuqncy signal after being mixed, the reflected signal of wherein said target object is the first via signal that the FMCW signal that FM signal generation unit generates generates through bonder, after the antenna transmitting that duplexer connects, the signal reflected by target object.
Step 32, baseband I C obtain the intermediate-freuqncy signal after frequency mixer mixing, and described target object carries out distance and/or tachometric survey according to described intermediate-freuqncy signal.
The time and frequency zone FMCW signal comparison diagram that a kind of mobile terminal that Fig. 3 b provides for the embodiment of the present invention three sends/receives. As shown in Figure 3 b, f0For the mid frequency of FMCW signal, feT () is actual frequency modulation and the frequency error of desirable FM signal, B is the bandwidth of FMCW signal, and T is the cycle of FMCW signal, Tm=T/2, fdownFor negative sense frequency modulation difference frequency, fupFor forward frequency modulation difference frequency, concrete in a FMCW signal cycle T, two TmCorresponding frequency modulation difference frequency respectively fdownAnd fup��
The signal frequency that FMCW signal transmitting/receiving and processing equipment is launched can be described as:
Assuming that launch signal to meet Phase Continuation and inactivity fluctuating, then formula (1) integration can be obtained the mathematic(al) representation of the FMCW signal launched:
The mathematic(al) representation of reflected signal:
Sr(t)=b St(t-td)(3)
After reflected signal and reception local oscillator direct conversion, after lowpass pre-filter, obtain Beat Signal SbThe time-domain representation of (t):
Sb(t)=LPF{c0��Sr(t)��St(t)}(4)
Here, c0Conversion loss for frequency mixer. Considering the effective bandwidth of signal processing, formula (4) will only retain difference frequency part, after its amplitude normalization, simultaneously take account of td=2R/c, owing to mathematical processes is more numerous and diverse, arranges formula (4), directly gives Beat Signal and the frequency of moving target:
Through type (6), it is easy to be concluded that
(1) difference frequency of moving target is by inherent frequency error, and linear modulation frequency difference and Nonlinear frequency modulation item that Doppler frequency shift produces collectively constitute; (2) in order to intercept and capture distance R and the speed v of target simultaneously, it is necessary to obtain two different difference frequency fupAnd fdown; (3) in order to obtain two different difference frequencies, signal transmitting/receiving and processing equipment should launch the FM signal possessing two kinds of Different Slope, so the sawtooth phase modulation signal of only a kind of slope can not be adopted, and generally adopts FMCW signal; (4) average difference frequency is adoptedCalculate relative distanceThe difference adopting frequency modulation upper and lower difference frequency complete cycle obtains Doppler frequency shiftThus obtaining relative velocity v=c (fup-fdown)/(4f0). In this manner it is possible to obtain relative distance and the velocity information of echo signal.
From the foregoing, it will be observed that baseband I C obtains the intermediate-freuqncy signal after frequency mixer is mixed, and according to intermediate-freuqncy signal, described target object is carried out range measurement, including:
Baseband I C, according to equation below, calculates the relative distance value of target object and mobile terminal:
Wherein, R is the relative distance value of target object and mobile terminal, and B is the modulating bandwidth of FMCW signal, TmFor the half in the frequency modulation cycle of FMCW signal, c is the light velocity, f0For the average frequency of FMCW signal, fupForward frequency modulation difference frequency for described intermediate-freuqncy signal; fdownNegative sense frequency modulation difference frequency for described intermediate-freuqncy signal.
Exemplary, baseband I C obtains the intermediate-freuqncy signal after frequency mixer mixing, and according to intermediate-freuqncy signal, described target object is carried out tachometric survey, including:
Baseband I C, according to equation below, calculates the relative velocity of target object and mobile terminal:
Wherein, v is the relative velocity of target object and mobile terminal, and c is the light velocity, f0For the average frequency of FMCW signal, fupForward frequency modulation difference frequency for described intermediate-freuqncy signal; fdownNegative sense frequency modulation difference frequency for described intermediate-freuqncy signal.
The measuring method of the mobile terminal that the present embodiment provides, is used for FMCW signal testing the speed or finding range of mobile terminal, adds the Consumer's Experience of mobile terminal, it is achieved that the application transboundary that advantage technology develops to civil area, have good demonstration effect.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle. It will be appreciated by those skilled in the art that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute without departing from protection scope of the present invention. Therefore, although the present invention being described in further detail by above example, but the present invention is not limited only to above example, when without departing from present inventive concept, other Equivalent embodiments more can also be included, and the scope of the present invention is determined by appended right.
Claims (10)
1. a mobile terminal, it is characterised in that include FM signal processing module, duplexer, antenna and baseband I C, wherein:
Described FM signal processing module includes FM signal generation unit, bonder and frequency mixer, the Continuous Wave with frequency modulation FMCW signal that described FM signal generation unit generates generates two paths of signals through bonder, the described antenna that first via signal connects through described duplexer is launched, the signal that first via signal is reflected by target object flows to frequency mixer as the output signal of described duplexer, second road signal flows to described frequency mixer together with the output signal of described duplexer, and the intermediate-freuqncy signal after described frequency mixer is mixed inputs to described baseband I C.
2. mobile terminal according to claim 1, it is characterized in that, described FM signal processing module also includes power amplifier PA, the first narrow band filter and the second narrow band filter, and the FMCW signal that wherein said FM signal generation unit generates inputs to described bonder by PA and the first narrow band filter; Intermediate-freuqncy signal after described frequency mixer is mixed inputs to described baseband I C through the second narrow band filter.
3. mobile terminal according to claim 1, it is characterized in that, described FM signal generation unit includes Direct Digital Synthesizer DDS and phase-locked loop pll, wherein the input of DDS receives reference signal from external crystal oscillator, described reference signal is synthesized Direct Digital frequency signal, described Direct Digital frequency signal is inputed to PLL, makes PLL generate FMCW signal.
4. mobile terminal according to claim 1, it is characterised in that described FM signal processing module is arranged in the special chip of mobile terminal.
5. mobile terminal according to claim 4, it is characterised in that described special chip is power management chip, Cellular Networks transceiver chip, Clock management chip or WiFi chip.
6. mobile terminal according to claim 1, it is characterised in that the frequency band of described FMCW signal is radio amateur's service band or 2.4G/5G wireless fidelity network ISM service band.
7. mobile terminal according to claim 1, it is characterised in that described mobile terminal is smart mobile phone, and described baseband I C includes CPU processor, channel encoder, digital signal processor, modem and interface module.
8. the measuring method of the mobile terminal described in an any one of claim 1-7, it is characterised in that including:
The second road signal that the FMCW signal that FM signal generation unit is generated by frequency mixer generates through bonder, it is mixed with the reflected signal of target object, with the intermediate-freuqncy signal after being mixed, the reflected signal of wherein said target object is the first via signal that the FMCW signal that FM signal generation unit generates generates through bonder, after the antenna transmitting that duplexer connects, the signal reflected by target object;
Baseband I C obtains the intermediate-freuqncy signal after frequency mixer mixing, and described target object carries out distance and/or tachometric survey according to described intermediate-freuqncy signal.
9. method according to claim 8, it is characterised in that baseband I C obtains the intermediate-freuqncy signal after frequency mixer mixing, and according to intermediate-freuqncy signal, described target object is carried out range measurement, including:
Baseband I C, according to equation below, calculates the relative distance value of target object and mobile terminal:
Wherein, R is the relative distance value of target object and mobile terminal, and B is the modulating bandwidth of FMCW signal, TmFor the half in the frequency modulation cycle of FMCW signal, c is the light velocity, f0For the average frequency of FMCW signal, fupForward frequency modulation difference frequency for described intermediate-freuqncy signal; fdownNegative sense frequency modulation difference frequency for described intermediate-freuqncy signal.
10. method according to claim 8, it is characterised in that baseband I C obtains the intermediate-freuqncy signal after frequency mixer mixing, and according to intermediate-freuqncy signal, described target object is carried out tachometric survey, including:
Baseband I C, according to equation below, calculates the relative velocity of target object and mobile terminal:
Wherein, v is the relative velocity of target object and mobile terminal, and c is the light velocity, f0For the average frequency of FMCW signal, fupForward frequency modulation difference frequency for described intermediate-freuqncy signal; fdownNegative sense frequency modulation difference frequency for described intermediate-freuqncy signal.
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