JP3383103B2 - Pseudo GPS signal generator - Google Patents
Pseudo GPS signal generatorInfo
- Publication number
- JP3383103B2 JP3383103B2 JP02904195A JP2904195A JP3383103B2 JP 3383103 B2 JP3383103 B2 JP 3383103B2 JP 02904195 A JP02904195 A JP 02904195A JP 2904195 A JP2904195 A JP 2904195A JP 3383103 B2 JP3383103 B2 JP 3383103B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pseudo
- signal generator
- gps
- gps receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ＧＰＳ受信機の作動
試験などに用いられる疑似ＧＰＳ信号発生器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo GPS signal generator used for an operation test of a GPS receiver.
【０００２】[0002]
【従来の技術】地球上の位置座標値を求める手段として
ＧＰＳ受信機が知られており、特に、測量用のこの種の
装置は、位相干渉型ＧＰＳ受信機と呼ばれていて、高精
度の測位，測量が行なえる。このような測量用のＧＰＳ
受信機は、通常、衛星からの電波を受信するアンテナ部
と、このアンテナ部で受信した電波を濾波，増幅などを
行なうＲＦ部と、ＲＦ周波数を中間周波数に変換するＩ
Ｆ部と、アナログ信号をデジタル信号に変換して、Ｃ／
Ａコードや航法メッセージを抽出するデジタル信号処理
器などから構成されている。2. Description of the Related Art A GPS receiver is known as a means for obtaining position coordinate values on the earth. In particular, this type of surveying device is called a phase interference type GPS receiver and has a high accuracy. Positioning and surveying can be performed. GPS for such surveying
A receiver usually has an antenna section for receiving radio waves from a satellite, an RF section for filtering and amplifying the radio waves received by the antenna section, and an I section for converting an RF frequency into an intermediate frequency.
The F part and the analog signal are converted into digital signals, and C /
It is composed of a digital signal processor for extracting an A code and a navigation message.
【０００３】ところで、上述したような電子回路から構
成されるＧＰＳ受信機は、組立が完了すると、ユーザー
に提供する前に、その作動試験を行なう必要があるが、
この場合に、以下に説明する技術的課題があった。By the way, a GPS receiver composed of the electronic circuit as described above needs to be subjected to an operation test before it is provided to the user after the assembly is completed.
In this case, there was a technical problem described below.
【０００４】[0004]
【発明が解決しようとする課題】すなわち、ＧＰＳ受信
機の作動を試験する場合には、衛星から送信されている
電波を受信して、例えば、Ｃ／Ａコードの相関が取れる
ことや、航法メッセージが抽出できることを確認すれば
良いが、衛星からの電波が受信可能な場所に組立てた受
信機を運搬することは、非常に面倒な上に、欠陥が発見
された場合に、その場所で調整することが難しい。That is, when the operation of the GPS receiver is tested, radio waves transmitted from satellites are received, and, for example, the C / A code can be correlated and the navigation message can be obtained. It is very troublesome to carry the assembled receiver to a place where the radio waves from the satellite can be received, but if a defect is found, adjust it at that place. Difficult to do.
【０００５】このような問題に対して、例えば、製造工
場の屋上などに電波信号を受信するアンテナを設置し、
アンテナとＧＰＳ受信機とを同軸ケーブルなどにより接
続することが考えられる。しかし、このような手段にお
いても、衛星からの電波の受信可能な個所は、周囲の障
害物などから規制され、アンテナの設置個所の選択が難
しく、仮に、電波の受信可能な個所が選択できたとして
も、その個所から製造現場までケーブルを敷設しなけれ
ばならず、いずれにしても、試験のための準備が非常に
面倒なものとなる。To solve such a problem, for example, an antenna for receiving radio signals is installed on the roof of a manufacturing plant,
It is conceivable to connect the antenna and the GPS receiver with a coaxial cable or the like. However, even with such a means, the location where the radio waves from the satellite can be received is restricted by surrounding obstacles, etc., and it is difficult to select the location where the antenna is installed. However, the cable must be laid from that location to the manufacturing site, and in any case, preparation for the test becomes very troublesome.
【０００６】本発明は、このような従来の実情に鑑みて
なされたものであって、その目的とするところは、室内
においてＧＰＳ受信機の試験が簡単に行なえる疑似ＧＰ
Ｓ信号発生器を提供することにある。The present invention has been made in view of such conventional circumstances, and an object of the present invention is to make it possible to easily test a GPS receiver indoors in a pseudo GP.
It is to provide an S signal generator.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、被試験用ＧＰＳ受信機より送出されるロ
ーカル信号をＩＦ周波数領域の搬送波に換える周波数変
換器と、Ｃ／Ａコードと航法メッセージとを送出するデ
ジタル信号発生器と、前記搬送波に前記Ｃ／Ａコードお
よび航法メッセージを混合するミキサーと、前記ミキサ
ーから送出される出力信号よりも高レベルの白色雑音を
送出するノイズ発生器と、前記ミキサーの出力信号に前
記白色雑音を加えた疑似ＧＰＳ信号を送出する加算器
と、前記疑似ＧＰＳ信号を所定のレベルに増幅して、被
試験用ＧＰＳ受信機に内蔵されたデジタル信号処理器に
供給する増幅器とを有することを特徴とする。前記増幅
器は、被試験用ＧＰＳ受信機に内蔵されているものを使
用することができる。To achieve the above object, the present invention provides a frequency converter for converting a local signal transmitted from a GPS receiver under test into a carrier in the IF frequency domain, and a C / A code. A digital signal generator for sending a navigation message, a mixer for mixing the C / A code and the navigation message on the carrier, and a noise generator for sending white noise of a higher level than the output signal sent from the mixer An adder for transmitting a pseudo GPS signal obtained by adding the white noise to the output signal of the mixer; and a digital signal processing built in the GPS receiver under test for amplifying the pseudo GPS signal to a predetermined level. And an amplifier for supplying to the container. As the amplifier, the one built in the GPS receiver under test can be used.
【０００８】[0008]
【作用】上記構成の疑似ＧＰＳ信号発生器によれば、被
試験用ＧＰＳ受信機に内蔵されているデジタル信号処理
器には、増幅器で所定のレベルに増幅した疑似ＧＰＳ信
号が供給されるが、この疑似ＧＰＳ信号には、搬送波
と、Ｃ／Ａコードおよび航法メッセージと、白色雑音と
が含まれており、この疑似ＧＰＳ信号からデジタル信号
処理器により航法メッセージが抽出されることや、Ｃ／
Ａコードの相関性を確認することにより、アンテナを設
置することなく、室内で組立が完了したＧＰＳ受信機の
作動が確認できる。According to the pseudo GPS signal generator having the above structure, the pseudo GPS signal amplified to a predetermined level by the amplifier is supplied to the digital signal processor incorporated in the GPS receiver under test. The pseudo GPS signal contains a carrier wave, a C / A code and a navigation message, and white noise. The digital signal processor extracts the navigation message from the pseudo GPS signal, and C / A code.
By checking the correlation of the A code, it is possible to check the operation of the GPS receiver that has been assembled indoors without installing an antenna.
【０００９】[0009]
【実施例】以下本発明の好適な実施例について添附図面
を参照して詳細に説明する。図１は、本発明にかかる疑
似ＧＰＳ信号発生器の一実施例を示している。同図に示
す疑似ＧＰＳ信号発生器Ａは、局部発振回路１０と、こ
の局部発振回路１０の出力側に接続された周波数変換器
１２と、Ｃ／Ａコードおよび航法メッセージなどのデジ
タル信号発生器１４と、前記周波数変換器１２およびデ
ジタル信号発生器１４の出力側に接続されたミキサー１
６と、ノイズ発生器１８と、前記ミキサー１６およびノ
イズ発生器１８の出力側に接続された加算器２０と、加
算器２０の出力側に接続された増幅器２２とを有してい
て、増幅器２２の出力側に被試験用ＧＰＳ受信機Ｂのデ
ジタル信号処理器２４が接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a pseudo GPS signal generator according to the present invention. The pseudo GPS signal generator A shown in the figure includes a local oscillation circuit 10, a frequency converter 12 connected to the output side of the local oscillation circuit 10, and a digital signal generator 14 for a C / A code and a navigation message. And a mixer 1 connected to the output side of the frequency converter 12 and the digital signal generator 14.
6, a noise generator 18, an adder 20 connected to the output side of the mixer 16 and the noise generator 18, and an amplifier 22 connected to the output side of the adder 20. The digital signal processor 24 of the GPS receiver under test B is connected to the output side of the.
【００１０】局部発振回路１０は、被試験用のＧＰＳ受
信機Ｂに内蔵されたものであって、周波数ｆ0 の発振器
１０ａと、この発振器１０ａの周波数をａ倍にする周波
数変換器１０ｂとから構成されている。周波数変換器１
２は、局部発振回路１０の周波数をｂ倍にして、ミキサ
ー１６に出力する。デジタル信号発生器１４は、Ｃ／Ａ
コードと航法メッセージとを送出するものであって、こ
れらのデジタル信号は、例えば、実際に衛星から受信し
た信号をサンプリングして、ＲＡＭなどの記憶手段に記
憶しておき、必要に応じて記憶手段から読み出したり、
Ｃ／Ａコード発生器を用いることなどにより得ることが
できる。The local oscillator circuit 10 is built in the GPS receiver B under test, and comprises an oscillator 10a having a frequency f 0 and a frequency converter 10b for multiplying the frequency of the oscillator 10a by a. It is configured. Frequency converter 1
2 multiplies the frequency of the local oscillation circuit 10 by b and outputs it to the mixer 16. The digital signal generator 14 is a C / A
A code and a navigation message are sent out. For these digital signals, for example, a signal actually received from a satellite is sampled and stored in a storage means such as a RAM, and if necessary, the storage means. Read from
It can be obtained by using a C / A code generator.
【００１１】ミキサー１６は、周波数変換器１２から送
出されるａｂｆ0 のアナログ信号と、デジタル信号発生
器１４から送出されるＣ／Ａコードと航法メッセージと
のデジタル信号を掛け合わせて、ＰＳＫ変調を行なうも
のである。ノイズ発生器１８は、ＰＳＫ変調された信号
よりも大きなレベルの白色雑音を送出するものであっ
て、通常、衛星から受信される電波信号が、殆どノイズ
に埋没されている状態なので、ノイズ発生器１４により
白色雑音を加算器２０を介して加えることにより、この
ような状態の疑似ＧＳＰ信号を生成している。The mixer 16 multiplies the analog signal of abf 0 sent from the frequency converter 12 and the digital signal of the C / A code and the navigation message sent from the digital signal generator 14 to perform PSK modulation. It is something to do. The noise generator 18 sends white noise at a level higher than that of the PSK-modulated signal, and normally, the radio signal received from the satellite is almost buried in noise. The white noise is added by 14 via the adder 20 to generate the pseudo GSP signal in such a state.
【００１２】加算器２０から送出された疑似ＧＰＳ信号
は、その後増幅器２２により被試験用ＧＰＳ受信機Ｂに
内蔵されているデジタル信号処理器２４での処理可能な
レベルまで増幅されて、処理器２４に入力される。この
ような疑似ＧＰＳ信号が入力されたデジタル信号処理器
２４では、疑似ＧＰＳ信号からＣ／Ａコードと航法メッ
セージが抽出される。The pseudo GPS signal sent from the adder 20 is then amplified by the amplifier 22 to a level that can be processed by the digital signal processor 24 built in the GPS receiver under test B, and the processor 24 is processed. Entered in. The digital signal processor 24 to which the pseudo GPS signal is input extracts the C / A code and the navigation message from the pseudo GPS signal.
【００１３】抽出されたＣ／Ａコードは、デジタル信号
処理器２４で作られているＣ／Ａコードと相関が得ら
れ、双方が一致しているかどうかが確認され、このよう
な操作を行なうことにより、製造されたＧＰＳ受信機Ｂ
が正常に作動しているか否かが検査される。さて、以上
のように構成された疑似ＧＰＳ信号発生器Ａによると、
屋外にアンテナやＧＰＳ受信機を設置することなく、屋
内でのＧＰＳ受信機の試験が簡単に行なえ、仮に、不具
合個所が発見された場合でも、その場で調整が容易に行
なえる。The extracted C / A code is correlated with the C / A code created by the digital signal processor 24, and it is confirmed whether or not they match each other. GPS receiver B manufactured by
Is checked for proper operation. Now, according to the pseudo GPS signal generator A configured as described above,
The GPS receiver can be easily tested indoors without installing an antenna or a GPS receiver outdoors, and even if a defective portion is found, adjustment can be easily performed on the spot.
【００１４】また、本実施例では、疑似ＧＰＳ信号の搬
送波の発振器として被試験用ＧＰＳ受信機Ｂに内蔵され
ている局部発振回路１０を用いているので、局部発振回
路１０自体の検査も行なえるとともに、被試験用ＧＰＳ
受信機Ｂの発振回路１０を使用することで、疑似ＧＰＳ
信号発生器Ａの構成も簡略化することができる。図２
は、本発明にかかる疑似ＧＰＳ信号発生器の他の実施例
を示しており、以下にその特徴点についてのみ説明す
る。同図に示す実施例では、加算器２０から送出される
疑似ＧＰＳ信号をデジタル信号処理器２４での処理可能
なレベルまで増幅する増幅器２２ａとして、被試験用Ｇ
ＰＳ受信機Ｂに内蔵されている増幅器を使用している。Further, in this embodiment, since the local oscillator circuit 10 built in the GPS receiver under test B is used as the oscillator of the carrier wave of the pseudo GPS signal, the local oscillator circuit 10 itself can be inspected. Along with the GPS under test
By using the oscillator circuit 10 of the receiver B, the pseudo GPS
The configuration of the signal generator A can also be simplified. Figure 2
Shows another embodiment of the pseudo GPS signal generator according to the present invention, and only the characteristic points will be described below. In the embodiment shown in the figure, the G under test is used as the amplifier 22a for amplifying the pseudo GPS signal transmitted from the adder 20 to a level that can be processed by the digital signal processor 24.
The amplifier built in PS receiver B is used.
【００１５】このように構成された疑似ＧＰＳ信号発生
器Ａ’によれば、上記実施例の作用効果に加えて、被試
験用ＧＰＳ受信機Ｂの増幅器２２ａの作動が確認される
とともに、疑似ＧＰＳ信号発生器Ａ’の構成もより一層
簡略化することができる。なお、図１，２に示したＣＰ
Ｕは、抽出されたＣ／Ａコードと白色雑音を加算命令し
たり、疑似ＧＰＳ信号との相関関係において双方が一致
しているかどうかを判断する。According to the pseudo GPS signal generator A'constructed in this way, in addition to the operational effects of the above embodiment, the operation of the amplifier 22a of the GPS receiver under test B is confirmed and the pseudo GPS signal is obtained. The configuration of the signal generator A ′ can be further simplified. The CP shown in FIGS.
The U gives an instruction to add the extracted C / A code and white noise, and judges whether or not the two coincide with each other in the correlation with the pseudo GPS signal.
【００１６】[0016]
【発明の効果】以上、実施例で詳細に説明したように、
本発明にかかる疑似ＧＰＳ信号発生器によれば、屋外に
アンテナやＧＰＳ受信機を設置することなく、屋内での
ＧＰＳ受信機の作動試験が簡単に行なえるとともに、被
試験用ＧＰＳ受信機の一部を疑似ＧＰＳ信号発生器に利
用するので、信号発生器の構成も簡略化することができ
る。As described above in detail in the embodiments,
According to the pseudo GPS signal generator of the present invention, the operation test of the indoor GPS receiver can be easily performed without installing an antenna or a GPS receiver outdoors, and the GPS receiver under test Since the part is used for the pseudo GPS signal generator, the configuration of the signal generator can be simplified.
【図１】本発明にかかる疑似ＧＰＳ信号発生器の一実施
例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a pseudo GPS signal generator according to the present invention.
【図２】本発明にかかる疑似ＧＰＳ信号発生器の他の実
施例を示すブロック図である。FIG. 2 is a block diagram showing another embodiment of the pseudo GPS signal generator according to the present invention.
Ａ，Ａ’ 疑似ＧＰＳ信号発生器
Ｂ 被試験用ＧＰＳ受信機
１０ 局部発振回路
１２ 周波数変換器
１４ デジタル信号発生器
１６ ミキサー（ダブルバランスド・ミキサ
ー）
１８ ノイズ発生器
２０ 加算器
２２ 増幅器
２４ デジタル信号処理器A, A'Pseudo GPS signal generator B GPS receiver under test 10 Local oscillation circuit 12 Frequency converter 14 Digital signal generator 16 Mixer (double balanced mixer) 18 Noise generator 20 Adder 22 Amplifier 24 Digital signal Processor
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−276931（ＪＰ，Ａ) 特開 平３−251778（ＪＰ，Ａ) 特開 平５−2063（ＪＰ，Ａ) 特開 平６−342055（ＪＰ，Ａ) 特開 平６−342056（ＪＰ，Ａ) 米国特許5093800（ＵＳ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 31/00 G01S 5/14 H04B 17/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-63-176931 (JP, A) JP-A-3-251778 (JP, A) JP-A-5-2063 (JP, A) JP-A-6- 342055 (JP, A) JP-A-6-342056 (JP, A) US Patent 5093800 (US, A) (58) Fields investigated (Int.Cl. 7 , DB name) G01R 31/00 G01S 5/14 H04B 17/00
Claims (2)
ーカル信号をＩＦ周波数領域の搬送波に換える周波数変
換器と、 Ｃ／Ａコードと航法メッセージとを送出するデジタル信
号発生器と、 前記搬送波に前記Ｃ／Ａコードおよび航法メッセージを
混合するミキサーと、 前記ミキサーから送出される出力信号よりも高レベルの
白色雑音を送出するノイズ発生器と、 前記ミキサーの出力信号に前記白色雑音を加えた疑似Ｇ
ＰＳ信号を送出する加算器と、 前記疑似ＧＰＳ信号を所定のレベルに増幅して、被試験
用ＧＰＳ受信機に内蔵されたデジタル信号処理器に供給
する増幅器とを有することを特徴とする疑似ＧＰＳ信号
発生器。1. A frequency converter for converting a local signal sent from a GPS receiver under test into a carrier in the IF frequency domain, a digital signal generator for sending a C / A code and a navigation message, and a carrier for the carrier. A mixer that mixes the C / A code and the navigation message, a noise generator that outputs a higher level of white noise than the output signal sent from the mixer, and a pseudo signal obtained by adding the white noise to the output signal of the mixer. G
Pseudo GPS having an adder for sending out a PS signal and an amplifier for amplifying the pseudo GPS signal to a predetermined level and supplying the amplified signal to a digital signal processor incorporated in the GPS receiver under test. Signal generator.
蔵されていることを特徴とする請求項１記載の疑似ＧＰ
Ｓ信号発生器。2. The pseudo GP according to claim 1, wherein the amplifier is incorporated in the GPS receiver under test.
S signal generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02904195A JP3383103B2 (en) | 1995-02-17 | 1995-02-17 | Pseudo GPS signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02904195A JP3383103B2 (en) | 1995-02-17 | 1995-02-17 | Pseudo GPS signal generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08220173A JPH08220173A (en) | 1996-08-30 |
| JP3383103B2 true JP3383103B2 (en) | 2003-03-04 |
Family
ID=12265322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02904195A Expired - Fee Related JP3383103B2 (en) | 1995-02-17 | 1995-02-17 | Pseudo GPS signal generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3383103B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3536245B2 (en) * | 1999-10-29 | 2004-06-07 | アンリツ株式会社 | Noise generator and CN controller |
| CN100353669C (en) * | 2002-04-17 | 2007-12-05 | 湖南科技大学 | Virtual signal generator for generating square wave by remainder interpolation comparision |
| US6825801B1 (en) * | 2003-12-11 | 2004-11-30 | The United States Of America As Represented By The Secretary Of The Navy | Outer loop test generator for global positioning system |
| JP2007208349A (en) * | 2006-01-31 | 2007-08-16 | Yokogawa Electric Corp | Testing system for radio |
| US8774333B2 (en) * | 2010-10-31 | 2014-07-08 | Mediatek Inc. | Signal processing apparatus and related method for generating target estimated signal of specific signal component in input signal |
-
1995
- 1995-02-17 JP JP02904195A patent/JP3383103B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08220173A (en) | 1996-08-30 |
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