CN1046069C - Portable field strength detector capable of correcting frequency deviation contained in field strength detected value - Google Patents
Portable field strength detector capable of correcting frequency deviation contained in field strength detected value Download PDFInfo
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- CN1046069C CN1046069C CN95102792A CN95102792A CN1046069C CN 1046069 C CN1046069 C CN 1046069C CN 95102792 A CN95102792 A CN 95102792A CN 95102792 A CN95102792 A CN 95102792A CN 1046069 C CN1046069 C CN 1046069C
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- field intensity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
To correct frequency characteristics not sacrificing the portability nor depending on the transmission side. The channel designated by the channel designation data 8 outputted from a channel designation part 9 of reception signals 1 is received by a reception part 2 and electric field intensity is detected by an electric field detection part 4. Channel information 10 showing which channel is received is supplied from the channel designation part 9 to a correction circuit 6. Based on the channel information 10, the detection value 5 outputted from an electric field part 4 is corrected. By this constitution, the signal from a transmission side is unnecessitated, the receiver of a wide band is unnecessitated, the shape of this device can be reduced and it is made to be suitable to portability.
Description
A kind of field intensity checkout gear of relate generally to of the present invention is used for detecting the field intensity of the signal that receives from a mobile radio signal passage, (intensity).Particularly, the present invention relates to a kind of field intensity checkout gear, this device is only applicable to distribute to the frequency range of mobile communication system, and can proofread and correct the frequency shift (FS) that detected field intensity value contains from the mobile radio signal of a mobile radio receiver.
Radio wave frequency scope as using in the mobile communication is typically car phone, has distributed two frequency bands, for example 800MHz and 1.5GHz.In the bandwidth of about 20MHz of each frequency range, 300 radio channels are set approximately.On the other hand, can detect the field intensity (intensity) of the field intensity of radio communication electric wave, checkout gear can have been bought on market.These the field intensity checkout gears that can buy on market can be operated the field intensity that has the radio signal of the frequency band that uses in the moving communicating field with detection.Yet,, therefore, on very wide frequency range, can reach identical precision because these field intensity checkout gears have general application target.Thereby these field intensity checkout gears need be done very hugely, and cost is very high.Therefore, although these checkout gears can move by automobile or analog, they are not suitable for the individual and carry.
In general, because design is used for the field intensity that the field intensity checkout gear of the purpose that mobile communication safeguards does not need to detect the radio wave of the passage except that the passage of distributing to the mobile communication frequency scope, if this checkout gear only is devoted to detect the field intensity of the signal of distributing to the mobile communication frequency scope, then resulting checkout gear has better simply circuit structure, and compact, promptly be easy to carry about with one.In Fig. 1, shown the field intensity checkout gear of a routine, this device has above-mentioned specific circuit architecture, only uses in mobile band.In this field intensity checkout gear, receive by signal receiving unit 2 according to the received signal 1 the passage of determining from the passage appointed information 8 of passage designating unit 9 outputs.The output of signal receiving unit 2 offers field intensity detecting unit 4 as field intensity information 3, and the detection signal that field intensity detecting unit 4 produces is as field intensity detected value 5 outputs of received signal 1.In this case, 5 one-tenth 1 pair 1 of the level of field intensity information 3 and field intensity detected value is corresponding.For example, when supposition now was 1V when the level of this field intensity inspection information 3, detected value 5 was 10-dB μ (decibels above milliwatt), if the level of field intensity information 3 becomes 2V, then, detected value 5 is 20dB μ.
Owing to the field intensity detected value of exporting corresponding to the field intensity information of input is changed with 1 pair 1 correspondence continuously by the field intensity detecting unit of conventional field intensity checkout gear, have under the situation of the skew that causes by frequency characteristic at high-frequency amplifier that constitutes signal receiving unit or high frequency filter (all not showing), when the field intensity information translation that has been offset by signal receiving unit became to detect voltage, this detected voltage and changes corresponding to the frequency shift (FS) of signal receiving unit.Consequently, the field intensity detected value has this skew.Thereby even when a plurality of field intensity of actual detected are mutually the same, as shown in Figure 2, the frequency that the detected value of exporting from field intensity detecting unit 4 uses according to its passage has different skew mutually.Thereby, in moving communicating field, can not detect correct field intensity on the spendable frequency range.
In order to address the above problem, among the Japanese Patent Application Publication 64-32538 (1989 open) a kind of method has been proposed.In this second kind conventional field intensity checkout gear, a plurality of correction of frequency characteristic elements and a plurality of band pass filter have been adopted at signal receiving end.Then, corresponding to the frequency of the signal that sends from transmitting terminal, correction of frequency characteristic element and band pass filter order are open-minded, to obtain reception result.According to reception result, for the frequency that sends is selected the correction of frequency characteristic element of such optimum, so that the skew that is caused by the frequency characteristic of signal receiving unit can remain within the permissible value of selecting in advance.
Yet above-mentioned second kind of conventional field intensity checkout gear has various shortcomings.For example, because when measuring field intensity at every turn, the enforcement of correction of frequency characteristic will be by sending test signal from transmitting terminal, in addition, the correction of frequency characteristic element will be selected corresponding to the signal reception result, this field intensity checkout gear needs complicated circuit structure, and need be corresponding to a plurality of band pass filters of measured frequency range, thereby causes checkout gear very huge.This has hindered carrying of checkout gear.In addition, unless signal receiving unit combines with signal transmitting unit, otherwise the correction of frequency characteristic can not be carried out.
The present invention attempts to address the above problem, and therefore, an object of the present invention is to provide a kind of portable field intensity checkout gear, and this device can be proofreaied and correct and the irrelevant frequency characteristic of signal sending end.
Specifically, field intensity checkout gear of the present invention is so a kind of field intensity checkout gear, and this device is used to detect the field intensity of the frequency band of distributing to tracking exchage.That is, the comprising of this field intensity checkout gear: be used to export the channel-assignment unit of first channel information, be used to distribute one with the corresponding channel number of wireless signal frequency that will receive; Be used to receive its frequency and import the signal receiving unit of corresponding wireless signal, thereby export the field intensity information of a wireless signal that is received from first channel information of channel-assignment unit; The field intensity detecting unit be used to import the field intensity information from the wireless signal that is received of signal receiving unit generation, thereby output is as the intensity level of field intensity detected value; Channel-assignment unit is also exported the second channel information that comprises the same channel number that is distributed by first channel information; And the correcting circuit that is coupled with field intensity detecting unit and channel-assignment unit, it comprises the corrected value that is used to proofread and correct the frequency characteristic that signal receiving unit had in the frequency band of distributing to mobile communication, be used to import second channel information from channel-assignment unit output, with select with by the corresponding corrected value of the channel number of second channel information distribution, thereby proofread and correct the field intensity detected value of importing from the field intensity detecting unit according to selected corrected value.
Above-mentioned correcting circuit also comprises:
Be used to store the patch memory of corrected value, each is all corresponding with channel number and by the allocated channel number it is used as and reads address information and read; With the allocation unit of channel-assignment unit coupling, distribute the address of reading of patch memory from the channel number of the second channel information distribution of channel-assignment unit input by use; With the add circuit of field intensity detecting unit coupling, the corrected value that is used for reading from patch memory is added to from the field intensity detected value of field intensity detecting unit input, thereby exports the detected value after a field intensity is proofreaied and correct.
According to the field intensity checkout gear with foregoing circuit structure, even when signal receiving unit has frequency characteristic, this frequency characteristic detects in advance, will be stored in the correction memory that joins with these frequency dependences with each frequency corresponding correction value then.Thereby, the frequency characteristic of the field intensity detected value that signal receiving unit receives and detected by the field intensity detecting unit can be proofreaied and correct by this way, the frequency identical with receive frequency that Here it is is designated, and the assigned frequency corresponding correction value is read from this correction memory therewith, thus the field intensity detected value that can obtain proofreading and correct.
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a block schematic diagram, has represented a structure of conventional field intensity checkout gear.
Fig. 2 has shown that this variation is caused by frequency characteristic by the variation in the detected field intensity value of conventional field intensity checkout gear of Fig. 1.
Fig. 3 is a block schematic diagram, has shown the structure according to the field intensity checkout gear of one embodiment of the invention.
Fig. 4 represents based on a predetermined frequency characteristic, the relation between corrected value and the signalling channel.
Fig. 5 is a block schematic diagram, has shown an internal structure of the correcting circuit that adopts in the field intensity checkout gear shown in Figure 3; And
Fig. 6 has shown the variation in the field intensity value of the correction that the field intensity checkout gear of Fig. 1 detects.
Fig. 3 is a block schematic diagram, has shown a kind of structure of field intensity (intensity) checkout gear according to one embodiment of the invention.Be noted that with Fig. 1 in the circuit unit of same or similar Fig. 3 adopt with Fig. 1 in same reference symbol represent, thereby no longer explain in this manual.This field intensity checkout gear is compared with Fig. 1's, has so similarly circuit structure, and its passage designating unit 9 offers signal receiving unit 2 with passage appointed information 8.The different circuit structures of this field intensity checkout gear are to represent that the appointed channel information 10 of which passage offers a correcting circuit 6 (will discuss later on) by this passage designating unit 9.In addition, a detected value 5 of exporting from field intensity detecting unit 4 offers this correcting circuit 6, and this correcting circuit 6 is proofreaied and correct these detected values 5 according to channel information 10, to produce a detected value 7 of proofreading and correct.Thereby frequency characteristic is corrected, and the detected value 7 of this correction is output.
In having the field intensity checkout gear of said structure, the received signal 1 with frequency of being determined by the passage appointed information 8 of passage designating unit 9 outputs is received by signal receiving unit 2.Then, the field intensity information 3 of these signal receiving unit 2 outputs offers field intensity detecting unit 4, to obtain field intensity detected value 5.Much less, this detected value 5 has the frequency characteristic of mentioning in the prior art as shown in Figure 2, thereby can not constitute the correct field intensity detected value of an expectation.Therefore, this detected value 5 offers correcting circuit 6.This correcting circuit 6 according to the channel information 10 that passage designating unit 9 provides, corresponding to each channel range of selecting in advance, is proofreaied and correct this detected value 5 by using the corrected value shown in Fig. 4.
Much less, the frequency characteristic that this corrected value can have by the signal receiving unit of measuring in advance 2 is determined, and frequency characteristic according to this mensuration, this corrected value limits in conjunction with the signalling channel of using in the mobile communication, in this mobile communication, field intensity detects by field intensity checkout gear according to the present invention.
On the other hand, as shown in Figure 5, correcting circuit 6 is made of a correcting unit 13 and an adder 11.This correcting unit 13 comprises an address designating unit 130 and a correction memory 131, and this memory 131 is used for storing in advance and channel number " 0 "-" 300 " corresponding correction value and address, as shown in Figure 4.The correction of this correcting circuit 6 is following to be carried out: promptly, the channel information 10 that passage designating unit 9 provides offers the address designating unit 130 of correcting unit 6, thereby reads and offer adder 11 corresponding to a corrected value 12 of channel number.Detected value 5 additions that adder 11 provides this corrected value 12 and field intensity detecting unit 4, thus the correction of expectation finished.
According to field intensity checkout gear with foregoing circuit structure, owing to adopted above-mentioned correcting circuit 6, even a correct detection value as shown in Figure 6 can produce when the detected value 5 from field intensity detecting unit 4 contains frequency shift (FS), as the frequency characteristics of earlier in respect of figures 2 to the explanation of the checkout gear of prior art.In other words, this correct detection value has reflected field intensity value very accurately.In this embodiment, for skew being reduced to+1[dB]～-1[dB] among, whole frequency range is divided into six passage area, and corrected value 12 is suitably distributed to this six passage area (see figure 4)s then.Apparent from Fig. 4, a large amount of passages is arranged in the straight substantially passage area of its frequency characteristic, and a spot of passage is arranged in another big passage area of its frequency characteristic deviation.Therefore, with shown in Fig. 4 relatively, in order to obtain more accurate detected value, the sum of the passage of handling as a passage area can reduce.Be noted that skew is exaggerated expression because the figure of Fig. 6 is shown with either large or small exaggeration.
As mentioned above, because field intensity checkout gear according to the present invention comprises the memory of the corrected value that is used for storing in advance the field intensity that is used for correct detection and the data (corrected value) that are used for memory is from then on read and detected value are carried out the correcting circuit of offset correction mutually, skew based on frequency characteristic is proofreaied and correct according to corrected value, therefore, can obtain making skew to be reduced to a field intensity detected value within the predetermined value.In addition, because this field intensity checkout gear designs the field intensity that only is used for detecting the radio signal that moving communicating field uses, so this field intensity checkout gear need not have the flat frequency characteristic on very wide scope.Consequently, this checkout gear can be very compact,, can have Portability preferably that is.In addition, when exporting the corrected value of reading according to the receive path information that is assigned to signal receiving unit from memory, the correction of skew can be carried out synchronously immediately with the received signal passage.
Though the present invention is by its preferred embodiment and carried out abundant description with reference to the accompanying drawings, for those skilled in the art, its variations and modifications are tangible.Therefore, unless these variations and modification have broken away from scope of the present invention, otherwise they should be included in wherein.
Claims (2)
1. field intensity checkout gear is used to detect the field intensity of the frequency band of distributing to tracking exchage, and this device comprises:
Be used to export the channel-assignment unit of first channel information, be used to distribute one with the corresponding channel number of wireless signal frequency that will receive;
Be used to receive its frequency and import the signal receiving unit of corresponding wireless signal, thereby export the field intensity information of a wireless signal that is received from first channel information of channel-assignment unit;
The field intensity detecting unit be used to import the field intensity information from the wireless signal that is received of signal receiving unit generation, thereby output is as the intensity level of field intensity detected value;
It is characterized in that:
Channel-assignment unit is also exported the second channel information that comprises the same channel number that is distributed by first channel information; And
The correcting circuit that is coupled with field intensity detecting unit and channel-assignment unit, it comprises the corrected value that is used to proofread and correct the frequency characteristic that signal receiving unit had in the frequency band of distributing to mobile communication, be used to import second channel information from channel-assignment unit output, with select with by the corresponding corrected value of the channel number of second channel information distribution, thereby proofread and correct the field intensity detected value of importing from the field intensity detecting unit according to selected corrected value.
2. field intensity checkout gear as claimed in claim 1 is characterized in that correcting circuit also comprises:
Be used to store the patch memory of corrected value, each is all corresponding with channel number and by the allocated channel number it is used as and reads address information and read;
With the allocation unit of channel-assignment unit coupling, distribute the address of reading of patch memory from the channel number of the second channel information distribution of channel-assignment unit input by use;
With the add circuit of field intensity detecting unit coupling, the corrected value that is used for reading from patch memory is added to from the field intensity detected value of field intensity detecting unit input, thereby exports the detected value after a field intensity is proofreaied and correct.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6034279A JPH07221697A (en) | 1994-02-08 | 1994-02-08 | Electric field intensity detector for mobile communication frequency band |
| JP34279/94 | 1994-02-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115140A CN1115140A (en) | 1996-01-17 |
| CN1046069C true CN1046069C (en) | 1999-10-27 |
Family
ID=12409729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95102792A Expired - Fee Related CN1046069C (en) | 1994-02-08 | 1995-02-08 | Portable field strength detector capable of correcting frequency deviation contained in field strength detected value |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH07221697A (en) |
| CN (1) | CN1046069C (en) |
| GB (1) | GB2288711A (en) |
| SG (1) | SG77552A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007114743A1 (en) * | 2006-03-31 | 2007-10-11 | St. Jude Medical Ab | Received signal strength measurement compensation |
| US9401769B2 (en) * | 2013-06-04 | 2016-07-26 | Apple Inc. | Methods for calibrating receive signal strength data in wireless electronic devices |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1986000769A1 (en) * | 1984-07-02 | 1986-01-30 | Motorola, Inc. | Self-calibrating signal strength detector |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2604578B2 (en) * | 1986-07-14 | 1997-04-30 | 日本電信電話株式会社 | Wireless relay device |
| JP2636308B2 (en) * | 1988-03-08 | 1997-07-30 | 松下電器産業株式会社 | Wireless communication equipment |
| CA2021217C (en) * | 1989-07-18 | 1994-11-01 | Akira Ishikura | Radio communication apparatus having a function for displaying reception field strength and method of controlling the apparatus |
| JP2740025B2 (en) * | 1989-11-22 | 1998-04-15 | 株式会社東芝 | Wireless communication device |
| JPH04207326A (en) * | 1990-11-30 | 1992-07-29 | Hitachi Ltd | Radiotelephony set |
| JP2936758B2 (en) * | 1991-02-20 | 1999-08-23 | 日本電気株式会社 | Wireless receiver |
| JP3232620B2 (en) * | 1992-02-10 | 2001-11-26 | 松下電器産業株式会社 | Wireless telephone |
| US5408696A (en) * | 1992-12-11 | 1995-04-18 | Telefonaktiebolaget L M Ericsson | Method and apparatus for correcting a radio signal strength information signal |
-
1994
- 1994-02-08 JP JP6034279A patent/JPH07221697A/en active Pending
-
1995
- 1995-02-06 SG SG1996005296A patent/SG77552A1/en unknown
- 1995-02-06 GB GB9502295A patent/GB2288711A/en not_active Withdrawn
- 1995-02-08 CN CN95102792A patent/CN1046069C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1986000769A1 (en) * | 1984-07-02 | 1986-01-30 | Motorola, Inc. | Self-calibrating signal strength detector |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9502295D0 (en) | 1995-03-29 |
| SG77552A1 (en) | 2001-01-16 |
| GB2288711A (en) | 1995-10-25 |
| JPH07221697A (en) | 1995-08-18 |
| CN1115140A (en) | 1996-01-17 |
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