CN104104458B - A kind of main signal decision method of time division signal and strength detecting method thereof - Google Patents
A kind of main signal decision method of time division signal and strength detecting method thereof Download PDFInfo
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Abstract
The invention provides a kind of main signal decision method of time division signal, extract the two paths of signals through overcoupling device coupled end and output after mixing, a road signal of coupled end changes into the second lower-frequency envelope voltage by wave detector; One road signal of output changes into the first lower-frequency envelope voltage through wave detector again after intermediate frequency filtering; By the chip with ADC function, two-way lower-frequency envelope voltage is compared in real time, draw the voltage difference of two-way lower-frequency envelope voltage, and judge it is main channel signal or interference signal; Concrete determination methods is as follows: according to the suppression characteristic of circuit, setting is when time division signal is main signal, the scope of the voltage difference of two-way lower-frequency envelope voltage, by the real-time comparative voltage difference of comparing unit, signal within the scope of this is main channel signal, and the signal exceeding this scope is interference signal.
Description
Technical field
The present invention relates to a kind of ionization meter of time division signal and the judgement to the frequency at signal place and interference frequency.
Background technology
Conventional signal strength measurement technology is substantially all detect in analog circuit, through frequency conversion, then filtering convert lower-frequency envelope magnitude of voltage to by detection chip, but the shortcoming of this kind of scheme is the impact being subject to interference signal, the particularly interference of neighboring trace signal, such as gsm service signal, when the intensity of neighboring trace signal and the signal strength difference of main channel are greater than 35dB, it is exactly the intensity of interference signal that this kind of method measures what come, and the signal strength signal intensity of non-primary, to the information that user makes the mistake, the method of usual head it off solves with the demodulation of numeric field, but this kind of method is too complicated, and cost is higher.The invention is intended to address this problem, under the condition of analog circuit, can accurately distinguish useful signal and interference signal, allow user in use determining apparatus whether can receive interference.
Summary of the invention
The object of the invention is to: the main signal decision method and the strength detecting method thereof that propose a kind of time division signal, by the scheme of analog circuit, time division signal intensity is measured, and exclude the interference signal and improve the signal interference problem of existing equipment, the especially interference of adjacent-channel signals.
Technical scheme of the present invention is: a kind of main signal decision method of time division signal, and extract the two paths of signals through overcoupling device coupled end and output after mixing, a road signal of coupled end changes into the second lower-frequency envelope voltage by wave detector; One road signal of output changes into the first lower-frequency envelope voltage through wave detector again after intermediate frequency filtering; By the chip with ADC function, two-way lower-frequency envelope voltage is compared in real time, draw the voltage difference of two-way lower-frequency envelope voltage, and judge it is main channel signal or interference signal;
Concrete determination methods is as follows: according to the suppression characteristic of circuit, setting is when time division signal is main signal, the scope of the voltage difference of two-way lower-frequency envelope voltage, by the real-time comparative voltage difference of comparing unit, signal within the scope of this is main channel signal, and the signal exceeding this scope is interference signal.
Preferably, a main signal decision method for time division signal, comprises the first coupler, the first attenuator and the second attenuator, the first low pass filter and the second low pass filter, first detector and second detector, the first intermediate-frequency filter and the second intermediate-frequency filter, the first amplifier and the second amplifier;
The coupling port of the first coupler is linked in sequence the second attenuator, the second low pass filter and second detector; Signal after mixing through the coupling port of first degree of coupling, and passes through the second attenuator and the second low pass filter, then after second detector, be converted to the second lower-frequency envelope voltage and V2;
The output port of the first coupler is linked in sequence the first attenuator, the first intermediate-frequency filter, the first amplifier, the second intermediate-frequency filter, the second amplifier, the first low pass filter and first detector; Signal after mixing is through the output port of first degree of coupling, sequentially pass through the first attenuator, the first intermediate-frequency filter, the first amplifier again, and then through the second intermediate-frequency filter, the second amplifier, the first low pass filter, convert the first lower-frequency envelope voltage and V1 to finally by first detector;
If two-way magnitude of voltage V1-V2=△ is V, be then main signal, retain V1 value now, if V1-V2< △ is V, be then interference signal, give up V1 value now; Wherein, the difference of V1 and the V2 that △ V is time division signal when being main signal.
Such as gsm service signal, carrier spacing is 200KHz, its business characteristic is that the signal of a carrier wave can drop in contiguous several carrier waves, in 2 particularly adjacent carrier waves, namely the strength difference between main channel signal and neighboring trace signal only has 35dB, thisly drop on signal in passband filtering all cannot filtering in any case, such a time division signal, when the signal strength signal intensity that the signal strength signal intensity of main channel is come lower than neighboring trace leakage signal, the signal strength values so detected by this traditional analog circuit detection method is the intensity level of neighboring trace signal, and the signal strength values of non-primary, the information that can make the mistake to user like this.The present invention extracts the two paths of signals through overcoupling device coupled end and output after mixing respectively, and through wave detector, two paths of signals is changed into lower-frequency envelope voltage V1, V2 respectively, compared by the chip with ADC function (including but not limited to single-chip microcomputer), compare its voltage difference in real time and judge main channel signal and interference signal, if two-way magnitude of voltage V1-V2 is △ V, being then channel main signal, if V1-V2< △ is V, is then interference channel signal.
The present invention also provides a kind of strength detecting method of time division signal, it is characterized in that: comprise the second coupler, radio-frequency filter, third detector and dual comparator; Wireless reception of signals also exports the second coupler to, the coupled end output signal of the second coupler is after radio-frequency filter and third detector, be converted to the 3rd lower-frequency envelope voltage and V3, V3 sends into the positive input of dual comparator, the reverse input end of dual comparator is regulated by bleeder circuit and obtains an incoming level V4, V3, V4 are compared the output voltage Vctrl obtaining dual comparator, when Vctrl is high level, time division signal is weak signal, and input end signal sends into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and input end signal sends into frequency mixer after attenuator.
Further, the first switch and second switch is also comprised in intensity detection circuit, the output of the second coupler connects the first switch, the output of dual comparator connects second switch, control the first switch and second switch by Vctrl, when Vctrl is high level, time division signal is weak signal simultaneously, Vctrl controls the first switch and second switch is beaten to amplifier, and the output end signal of the second coupler sends into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and Vctrl controls the first switch and second switch is beaten to attenuator, and the output end signal of the second coupler sends into frequency mixer after attenuator.
Further, the value of described incoming level V4 is 0.5 ± 0.1V.
The invention has the beneficial effects as follows: relative to traditional analog circuit detection method, detection method feature described in the invention compares the voltage difference through the two paths of signals of overcoupling device coupled end and output after mixing, the signal strength values of main channel accurately can be quoted by comparing 2 road voltage differences in real time, if namely voltage difference is △ V, single-chip microcomputer can think that the V1 value now detected is effective value, retain this value, if voltage difference < △ is V, single-chip microcomputer, then for being interference signal, gives up V1 value now.
The present invention also comprises strong signal determining problem, detection is carried out at the input road signal that is coupled, control voltage is compared by comparator, by the selector switch of this voltage control circuit, for strong signal, signal enters frequency mixer after attenuator, for weak signal, signal enters frequency mixer after amplifier, and this kind of method can increase the dynamic range of equipment.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of the trunk signal decision method of time division signal;
Fig. 2 is wave detector schematic block diagram;
Fig. 3 is strong signal determining schematic diagram;
Fig. 4 is comparator schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, the first coupler, the first attenuator and the second attenuator, the first low pass filter and the second low pass filter, first detector and second detector, the first intermediate-frequency filter and the second intermediate-frequency filter, the first amplifier and the second amplifier is comprised.Wherein, the EMDC-10-1 of MACOM company selected by first coupler, Pi type impedance network attenuator selected by first attenuator and the second attenuator, HDF902E1 selected by first low pass filter and the second low pass filter, first detector and second detector select the AD8310ARM of ADI company, first intermediate-frequency filter and the second intermediate-frequency filter select 361731, and the SPF5043 of RFMD company selected by the first amplifier and the second amplifier.
The degree of coupling of the first coupler is Cp, and insertion loss is Il, and for the signal Pmix (dBm) after mixing, the signal strength signal intensity of the first coupler coupling port is Pmix-Cp, and the signal strength signal intensity of output port is Pmix-I
l.The coupling port of first degree of coupling is linked in sequence the second attenuator, the second low pass filter and second detector, and the signal after mixing is through the coupling port of first degree of coupling, then through the second attenuator and the second low pass filter, the portfolio premium of attenuation filter is G
a, then after second detector, be converted to the second lower-frequency envelope voltage V2.The output port of first degree of coupling is linked in sequence the first attenuator, the first intermediate-frequency filter, the first amplifier, the second intermediate-frequency filter, the second amplifier, the first low pass filter and first detector, signal after mixing is through the output port of first degree of coupling, again through the first attenuator, the first intermediate-frequency filter, the first amplifier, and then through the second intermediate-frequency filter, the second amplifier, the first low pass filter, the portfolio premium of decay, filtering and amplifier is G
b, convert lower-frequency envelope voltage V1 to finally by first detector.
The effect of V2 is used to judge main signal and interference signal, after determined main signal and interference signal, the field intensity value finally shown is determined by the value of V1, if two-way magnitude of voltage V1-V2=△ is V, be then main signal, retain V1 value now, if V1-V2< △ is V, be then interference signal, give up V1 value now.
Below describe judgement parameter of the present invention in detail: the output voltage of wave detector depends on the level value of input signal, for logarithmic detector, incoming level Pin, in its linear input range, its output voltage:
Vout＝K×Pin(1)
In formula, K is detection output voltage slope
A road signal, the signal voltage of its coupling is
V2＝K×(Pmix-Cp+G
A)，(2)
B road signal, the voltage of its output signal is
V1＝K×(Pmix-I
l+G
B)，(3)
(2), (3) formula are arranged out
△V＝V2-V1＝K×(G
B-I
l+Cp-G
A)(4)
(4) formula gives the magnitude of voltage of △ V, is the gain difference of two-way circuit,
If main channel signal G
b=P
fL+ G
lNA, if interference signal G
b=P
i+ G
lNA.
P in formula
fLfor the insertion loss of intermediate-frequency filter, G
lNAfor the gain of amplifier, P
ifor intermediate-frequency filter is to the degree of suppression of interference signal.In the range of linearity of wave detector, can decide primary channel signal and interference signal accurately.
As shown in Figure 2, for given detection device, its linear input range is (P_dmin, P_dmax) unit dBm, can pass through G
aand G
brespectively the level of A, B port is adjusted to the linear input range of wave detector.For the AD8310ARM of ADI company, its dynamic range reaches 95dB, but in side circuit, the input signal of wave detector not only comprises useful signal, also comprise ground noise, so its dynamic range is by the impact of ground noise, ground noise directly affects the minimum incoming level of whole circuit, namely the sensitivity of equipment.
For these reasons, the present embodiment provides a kind of strong signal determinating circuit, by strong signal determining scheme, can improve the dynamic range of equipment.As shown in Figure 3,4, the degree of coupling of the second coupler is Cp, and insertion loss is I
l, for wireless input signal, the signal strength signal intensity of its coupled end is Pmix-Cp.The signal of coupled end is through radio-frequency filter and third detector, wherein HDF902E1 selected by radio-frequency filter, AD8314ACPZ-R7 selected by third detector, the 3rd lower-frequency envelope voltage V3 is converted to after third detector, V3 sends into the positive input of dual comparator, the reverse input end of dual comparator is regulated by bleeder circuit and obtains an incoming level V4, and V4 value is 0.5V, V3, V4 is compared the output voltage Vctrl obtaining dual comparator.
The output of the second coupler connects the first switch, the output of dual comparator connects second switch, and control the first switch and second switch by Vctrl simultaneously, when Vctrl is high level, time division signal is weak signal, Vctrl controls the first switch and second switch is beaten to amplifier, and the output end signal of the second coupler sends into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and Vctrl controls the first switch and second switch is beaten to attenuator, and the output end signal of the second coupler sends into frequency mixer after attenuator.
Through amplifying, (Vctrl is high level to input signal, input end signal is through amplifier) or decay (Vctrl is low level, input end signal is through attenuator) after send into frequency mixer, extract the two paths of signals through overcoupling device coupled end and output after mixing, coupled end signal is through the second attenuator and the second low pass filter, and the portfolio premium of decay and filtering is G
athe second lower-frequency envelope voltage V2 is converted to again after second detector, the signal of output is through the first attenuator, the second intermediate-frequency filter, the second amplifier, and then through the second intermediate-frequency filter, the second amplifier and the first low pass filter, the portfolio premium of decay, filtering and amplifier is G
bthe first lower-frequency envelope voltage V1 is converted to finally by first detector, the voltage of V1 and V2 is admitted to single-chip microcomputer, compare its voltage difference in real time and judge main channel signal and interference channel signal, if two-way magnitude of voltage V1-V2 is △ V, being then main channel signal, if V1-V2< △ is V, is then interference signal.
Although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (3)
1. a main signal decision method for time division signal, is characterized in that: extract the two paths of signals through overcoupling device coupled end and output after mixing, a road signal of coupled end changes into the second lower-frequency envelope voltage by wave detector; One road signal of output changes into the first lower-frequency envelope voltage through wave detector again after intermediate frequency filtering; By the chip with ADC function, two-way lower-frequency envelope voltage is compared in real time, draw the voltage difference of two-way lower-frequency envelope voltage, and judge it is main channel signal or interference signal;
Concrete determination methods is as follows: according to the suppression characteristic of circuit, setting is when time division signal is main signal, the scope of the voltage difference of two-way lower-frequency envelope voltage, by the real-time comparative voltage difference of comparing unit, signal within the scope of this is main channel signal, and the signal exceeding this scope is interference signal;
Comprise the first coupler, the first attenuator and the second attenuator, the first low pass filter and the second low pass filter, first detector and second detector, the first intermediate-frequency filter and the second intermediate-frequency filter, the first amplifier and the second amplifier;
The coupling port of the first coupler is linked in sequence the second attenuator, the second low pass filter and second detector; Signal after mixing through the coupling port of the first coupler, and passes through the second attenuator and the second low pass filter, then after second detector, be converted to the second lower-frequency envelope voltage and V2;
The output port of the first coupler is linked in sequence the first attenuator, the first intermediate-frequency filter, the first amplifier, the second intermediate-frequency filter, the second amplifier, the first low pass filter and first detector; Signal after mixing is through the output port of the first coupler, sequentially pass through the first attenuator, the first intermediate-frequency filter, the first amplifier again, and then through the second intermediate-frequency filter, the second amplifier, the first low pass filter, convert the first lower-frequency envelope voltage and V1 to finally by first detector;
If two-way magnitude of voltage V1-V2=△ is V, be then main signal, retain V1 value now, if V1-V2< △ is V, be then interference signal, give up V1 value now; Wherein, the difference of V1 and the V2 that △ V is time division signal when being main signal.
2. a strength detecting method for time division signal, is characterized in that: comprise the second coupler, radio-frequency filter, third detector and dual comparator; Wireless reception of signals also exports the second coupler to, the coupled end output signal of the second coupler is after radio-frequency filter and third detector, be converted to the 3rd lower-frequency envelope voltage and V3, V3 sends into the positive input of dual comparator, the reverse input end of dual comparator is regulated by bleeder circuit and obtains an incoming level V4, V3, V4 is compared the output voltage Vctrl obtaining dual comparator;
Comprise the first switch and second switch, the output of the second coupler connects the first switch, the output of dual comparator connects second switch, control the first switch and second switch by Vctrl simultaneously, when Vctrl is high level, time division signal is weak signal, and Vctrl controls the first switch and second switch is beaten to amplifier, and the output end signal of the second coupler sends into frequency mixer after amplifier; When Vctrl is low level, time division signal is strong signal, and Vctrl controls the first switch and second switch is beaten to attenuator, and the output end signal of the second coupler sends into frequency mixer after attenuator.
3. the strength detecting method of a kind of time division signal according to claim 2, is characterized in that: the value of described incoming level V4 is 0.5 ± 0.1V.
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Denomination of invention: Method for determining main signals of time division signals and method for detecting strength of main signals Effective date of registration: 20190425 Granted publication date: 20160113 Pledgee: Bank of Nanjing, Limited by Share Ltd, Nanjing branch Pledgor: Nanjing seengen Technology Development Co. Ltd. Registration number: 2019320000200 |
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