JPH07113860A - Dummy gps signal sending out system of reference station - Google Patents

Dummy gps signal sending out system of reference station

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Publication number
JPH07113860A
JPH07113860A JP5260679A JP26067993A JPH07113860A JP H07113860 A JPH07113860 A JP H07113860A JP 5260679 A JP5260679 A JP 5260679A JP 26067993 A JP26067993 A JP 26067993A JP H07113860 A JPH07113860 A JP H07113860A
Authority
JP
Japan
Prior art keywords
gps
data
signal
satellite
pseudo
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.)
Granted
Application number
JP5260679A
Other languages
Japanese (ja)
Other versions
JP3187222B2 (en
Inventor
Shuichi Kawano
修一 川野
Masatoshi Harikae
正敏 張替
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP26067993A priority Critical patent/JP3187222B2/en
Priority to US08/324,503 priority patent/US5440491A/en
Publication of JPH07113860A publication Critical patent/JPH07113860A/en
Application granted granted Critical
Publication of JP3187222B2 publication Critical patent/JP3187222B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To eliminate the effect of a GPS time monitor error on distance measuring accuracy. CONSTITUTION:A monitor GPS receiver Al receives the GPS signal from each GPS satellite through an antenna A2 to detect satellite data and calculates observation data on the basis of the user clock pulse synchronized with the reference clock from a reference oscillator A3. A data processor A4 calculates a error value from the satellite data and observation data obtained in the receiver A1 on the basis of the user clock pulse and perform formatting with respect to those data to form transmission data. A transmitter A5 synthesizes a PN code and the transmission data on the basis of the user clock pulse to form a dummy GPS signal and modulates the carrier wave signal synchronized with the reference clock and amplifies the modulation output thereof. An antenna A6 is directed to a specific stationary satellite and sends out a dummy GPS signal to a user GPS receiver through the stationary satellite.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、地上に設置され、擬
似GPS信号を送出することで、GPS衛星の一つとし
て利用される基準局の擬似GPS信号送出システムに関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo GPS signal transmission system of a reference station which is installed on the ground and which is used as one of GPS satellites by transmitting pseudo GPS signals.

【0002】[0002]

【従来の技術】現在の基準局にあっては、GPS衛星の
一つとして測位に利用するため、局の時刻系をGPS時
刻で管理している。すなわち、各GPS衛星がGPS時
刻に同期させて測距信号を送信しているのと同様に、基
準局でも所定の基準点の測距信号(擬似GPS信号)を
GPS時刻に同期させて送信している。
2. Description of the Related Art In a current standard station, since it is used for positioning as one of the GPS satellites, the time system of the station is managed by GPS time. That is, similarly to the case where each GPS satellite transmits a distance measurement signal in synchronization with GPS time, the reference station also transmits a distance measurement signal (pseudo GPS signal) at a predetermined reference point in synchronization with GPS time. There is.

【0003】しかしながら、現在、米国国防省による強
制的精度劣化(SA:セレクティブ・アベイラビリテ
ィ)が行われているため、基準局では基準となるGPS
時刻を正確にモニタすることは非常に困難である。
However, since the US Department of Defense is currently forcibly degrading accuracy (SA: Selective Availability), the reference station uses a GPS standard.
Accurately monitoring the time is very difficult.

【0004】このような基準局でのGPS時刻モニタ誤
差は、基準局とユーザGPS受信機間の測距精度に影響
を与え、ユーザGPS受信機の測位精度を劣化させてし
まうことになる。
Such a GPS time monitor error at the reference station affects the distance measurement accuracy between the reference station and the user GPS receiver, and deteriorates the positioning accuracy of the user GPS receiver.

【0005】[0005]

【発明が解決しようとする課題】以上述べたように、従
来の基準局の擬似GPS信号送出システムには、SAに
よってGPS時刻を正確にモニタすることができないた
め、そのモニタ誤差が基準局とユーザGPS受信機間の
測距精度に影響を与えることとになり、その結果ユーザ
GPS受信機の測位精度が劣化するという問題があっ
た。
As described above, in the conventional pseudo GPS signal transmitting system for the reference station, the GPS time cannot be accurately monitored by SA, and therefore the monitor error is caused by the reference station and the user GPS reception. There is a problem in that the accuracy of distance measurement between devices is affected, and as a result, the positioning accuracy of the user GPS receiver deteriorates.

【0006】この発明は上記の課題を解決するためにな
されたもので、基準局とユーザGPS受信機間の測距精
度にSAによるGPS時刻モニタ誤差の影響を与えず、
これによってユーザGPS受信機の測位精度を維持する
ことのできる基準局の擬似GPS信号送出システムを提
供することを目的とする。
The present invention has been made to solve the above problems, and does not affect the accuracy of distance measurement between the reference station and the user GPS receiver due to the error of the GPS time monitor due to SA.
Accordingly, it is an object of the present invention to provide a pseudo GPS signal transmission system of a reference station that can maintain the positioning accuracy of the user GPS receiver.

【0007】[0007]

【課題を解決するための手段】上記課題を解決するため
にこの発明は、地上に設置され、擬似GPS信号を送出
することでGPS衛星の一つとして利用される基準局の
擬似GPS信号送出システムにおいて、GPS衛星から
の電波を捕捉するGPS受信アンテナと、このGPS受
信アンテナを通じて各GPS衛星からのGPS信号を受
信する受信部、受信したGPS信号から衛星データを検
出する衛星データ検出部、基準クロックに同期したユー
ザクロックパルスを生成するパルス生成部、そのパルス
に基づいて受信したGPS信号から観測データを求める
観測データ演算部を備えるモニタGPS受信機と、この
モニタGPS受信機で得られた衛星データ、観測データ
から送信元のGPS衛星と既知の受信点間の理論距離に
対するシュードレンジ誤差値を算出する誤差データ算出
部、これらのデータについて所定のデータフォーマット
化を行って送信データを生成する送信データ生成部を備
えるデータ処理装置と、スペクトラム拡散用のPNコー
ドを前記ユーザクロックパルスに時刻同期させて発生す
るPNコード発生部、ここで生成されたPNコードと前
記データ処理部からの送信データとを前記ユーザクロッ
クパルスに基づいて合成することで擬似GPS信号を生
成する擬似GPS信号生成部、前記基準クロックに同期
した搬送波信号を生成する搬送波生成部、ここで生成さ
れた搬送波信号を前記擬似GPS信号で変調する変調
器、この変調器の出力を電力増幅する電力増幅器を備え
る送信機と、前記送信機からの擬似GPS信号を任意の
方向に向けて送出する送信アンテナとを具備し、前記送
信アンテナから送出される擬似GPS信号を直接または
特定の静止衛星を介してユーザGPS受信機に伝送する
ようにした。
In order to solve the above problems, the present invention provides a pseudo GPS signal transmission system of a reference station which is installed on the ground and is used as one of GPS satellites by transmitting pseudo GPS signals. , A GPS receiving antenna for capturing radio waves from GPS satellites, a receiving unit for receiving GPS signals from each GPS satellite through the GPS receiving antenna, a satellite data detecting unit for detecting satellite data from the received GPS signals, and a reference clock. A pulse generator that generates a synchronized user clock pulse, a monitor GPS receiver including an observation data calculator that obtains observation data from a GPS signal received based on the pulse, and satellite data obtained by this monitor GPS receiver, From the observation data, the pseudo-ray for the theoretical distance between the source GPS satellite and the known receiving point Error data calculation unit that calculates an error value, a data processing device that includes a transmission data generation unit that generates transmission data by performing a predetermined data format on these data, and a PN code for spread spectrum as the user clock pulse. A PN code generating section that is generated in time synchronization with each other, and a pseudo GPS signal that generates a pseudo GPS signal by synthesizing the PN code generated here and the transmission data from the data processing section based on the user clock pulse. Transmission including a generator, a carrier generator that generates a carrier signal synchronized with the reference clock, a modulator that modulates the carrier signal generated here with the pseudo GPS signal, and a power amplifier that power-amplifies the output of the modulator And a transmitting antenna for transmitting a pseudo GPS signal from the transmitter in an arbitrary direction Provided with, and adapted to transmit a pseudo GPS signal transmitted from the transmitting antenna directly or the user GPS receiver via a particular geostationary satellite.

【0008】[0008]

【作用】上記のように構成された基準局の擬似GPS信
号送出システムでは、全体の処理をユーザクロックパル
スで同期をとって行うことで、擬似GPS信号を利用し
てDGPS補正及び測距を行う場合に、SAによる時刻
誤差を回避し、これによってユーザGPS受信機の測位
精度を維持するようにしている。
In the pseudo GPS signal transmission system of the reference station configured as described above, when the entire process is performed in synchronization with the user clock pulse, the DGPS correction and the distance measurement are performed using the pseudo GPS signal. In addition, the time error due to SA is avoided, thereby maintaining the positioning accuracy of the user GPS receiver.

【0009】[0009]

【実施例】以下、図面を参照してこの発明の一実施例に
ついて説明する。図1はこの発明に係る擬似GPS信号
送出システムの構成を示すものである。モニタGPS受
信機A1は、GPS受信アンテナA2を通じて各GPS
衛星からのGPS信号を受信する受信部11と、受信し
たGPS信号から衛星データ(エフェメリス、アルマナ
ック)を検出する衛星データ検出部12と、基準発振器
A3からの基準クロックに同期したユーザクロックパル
スを生成するパルス生成部13と、そのパルスに基づい
て受信したGPS信号から観測データ(シュードレン
ジ、デルタレンジ、ユーザ時刻等)を求める観測データ
演算部14とで構成される。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a pseudo GPS signal transmission system according to the present invention. The monitor GPS receiver A1 receives each GPS through the GPS receiving antenna A2.
A receiver 11 for receiving GPS signals from satellites, a satellite data detector 12 for detecting satellite data (ephemeris, almanac) from the received GPS signals, and a user clock pulse synchronized with a reference clock from a reference oscillator A3. The pulse generator 13 and the observation data calculator 14 that obtains observation data (pseudo range, delta range, user time, etc.) from the GPS signal received based on the pulse.

【0010】データ処理装置A4は、モニタGPS受信
機A1で得られた衛星データ、観測データから送信元の
GPS衛星と受信点(既知)間の理論距離に対するシュ
ードレンジ誤差値を算出する誤差データ算出部41と、
これらのデータについて所定のデータフォーマット化を
行って送信データを生成する送信データ生成部43とで
構成される。
The data processing device A4 calculates error data for calculating a pseudo range error value with respect to the theoretical distance between the GPS satellite of the transmission source and the reception point (known) from the satellite data and observation data obtained by the monitor GPS receiver A1. Part 41,
A transmission data generation unit 43 that generates transmission data by performing a predetermined data format on these data.

【0011】送信機A5はスペクトラム拡散用のPNコ
ード発生部51と、ここで生成されたPNコードとデー
タ処理装置A4からの送信データとをユーザクロックパ
ルスに基づいて合成することで擬似GPS信号を生成す
る擬似GPS信号生成部52と、基準発振器A3からの
基準クロックに同期した搬送波信号を生成する搬送波生
成部53と、ここで生成された搬送波信号を上記擬似G
PS信号で変調する変調器54と、この変調器54の出
力を電力増幅する電力増幅器55とで構成される。
The transmitter A5 synthesizes the PN code generator 51 for spread spectrum, the PN code generated here and the transmission data from the data processor A4 based on the user clock pulse to generate a pseudo GPS signal. The pseudo GPS signal generator 52 for generating, the carrier wave generator 53 for generating a carrier wave signal synchronized with the reference clock from the reference oscillator A3, and the carrier wave signal generated here for the pseudo G
It is composed of a modulator 54 that modulates with a PS signal and a power amplifier 55 that power-amplifies the output of the modulator 54.

【0012】GPS送信アンテナA6は特定の静止衛星
に向けられており、送信機A5からの擬似GPS信号を
静止衛星を介してユーザGPS受信機に送出する。すな
わち、上記構成では、全体の処理をユーザクロックパル
スで同期をとって行っている。このような処理をここで
はユーザクロック同期方式と称することにする。
The GPS transmitting antenna A6 is directed to a specific geostationary satellite, and sends a pseudo GPS signal from the transmitter A5 to the user GPS receiver via the geostationary satellite. That is, in the above configuration, the entire process is synchronized with the user clock pulse. Such processing will be referred to as a user clock synchronization method here.

【0013】尚、上記送信データのフォーマットについ
ては種々の文献に記載されているのでその詳細な説明を
省略するが、この方式においては、擬似GPS信号のハ
ードウェア全体の遅延量をデータの一つして追加するよ
うにしたことを特徴とする。
Since the format of the transmission data is described in various documents, detailed description thereof will be omitted. In this system, the delay amount of the entire hardware of the pseudo GPS signal is one of the data. The feature is that it is added.

【0014】上記ユーザクロック同期方式において、以
下にSAによる時刻誤差に関係なくユーザGPS受信機
で測位が行われることを、オーバーレイを例に取って説
明する。
In the above user clock synchronization method, the positioning will be performed by the user GPS receiver regardless of the time error due to SA, by taking an overlay as an example.

【0015】図2はオーバーレイの基本概念図を示すも
ので、Aは図1に示した基準局、BはGPS衛星、Cは
基準局Aからの電波を受信して特定範囲に再放射するた
めのトランスポンダを搭載する静止衛星、Dは前記特定
範囲内で移動中の航行体(ユーザ)、D1はユーザGP
S受信機、D2はユーザGPSアンテナである。ここ
で、図2のパラメータを下記のように定義する。
FIG. 2 shows a basic conceptual diagram of the overlay, where A is the reference station shown in FIG. 1, B is a GPS satellite, and C is a transponder for receiving radio waves from the reference station A and re-radiating them to a specific range. A geostationary satellite equipped with a vehicle, D is a navigation vehicle (user) moving within the specified range, and D1 is a user GP.
S receiver, D2 is a user GPS antenna. Here, the parameters of FIG. 2 are defined as follows.

【0016】[0016]

【数1】 それぞれのシュードレンジと真の距離の関係は下記のよ
うになる。
[Equation 1] The relationship between each pseudo range and the true distance is as follows.

【0017】[0017]

【数2】 [Equation 2]

【0018】尚、オーバーレイのアップリンク、ダウン
リンク両電波の電離層誤差はモデル化し、除去できるも
のとして、 (3)式には含めていない。(1)式より、各G
PS衛星Bの補正値Δρcor は次式に示すようになる。
It should be noted that the ionospheric errors of both the uplink and downlink radio waves of the overlay are modeled and are not included in the equation (3) as those that can be removed. From equation (1), each G
The correction value Δρ cor of PS satellite B is as shown in the following equation.

【0019】[0019]

【数3】 [Equation 3]

【0020】ユーザGPS受信機D1側では、観測した
各GPS衛星Bのシュードレンジにそれぞれの補正を行
うので、 (2)式と (4)式より補正後のシュードレンジρ
u ′は次式に示すようになる。
On the user GPS receiver D1 side, the observed pseudo range of each GPS satellite B is corrected. Therefore, the corrected pseudo range ρ is calculated from equations (2) and (4).
u'is as shown in the following equation.

【0021】[0021]

【数4】 [Equation 4]

【0022】ここで、同一のGPS信号について、基準
局での受信時刻t1 とユーザGPS受信機D1での受信
時刻t2 の時刻差は短時間であるため、Δρsa(t2)はほ
ぼΔρsa(t1)に等しいものとして考えることができる。
このとき、ρu ′は次式に示すようになる。
Since the time difference between the reception time t 1 at the reference station and the reception time t 2 at the user GPS receiver D1 for the same GPS signal is short, Δρ sa (t2) is approximately Δρ sa. It can be thought of as being equal to (t1) .
At this time, ρ u ′ is as shown in the following equation.

【0023】[0023]

【数5】 次にオーバーレイ信号について考える。ΔρtcとΔρmc
は、本方式では同期がとれているため、下記に示すよう
な関係となる。
[Equation 5] Next, consider the overlay signal. Δρ tc and Δρ mc
Are synchronized with each other in this method, and thus have the following relationship.

【0024】[0024]

【数6】 また、γo はさらに分解すると下記のような関係にあ
る。
[Equation 6] Further, γ o has the following relationship when further decomposed.

【0025】[0025]

【数7】 (7) 式及び (8)式を (3)式に代入すると、次式に示すよ
うになる。
[Equation 7] Substituting Eqs. (7) and (8) into Eq. (3) gives the following equation.

【0026】[0026]

【数8】 [Equation 8]

【0027】ここで、(γou+Δρth+Δρtr+Δ
ρmh)をオーバーレイ・チャンネル補正データとして送
出することにより、ユーザGPS受信機D1での補正後
のシュードレンジρo ′は (9)式より次式に示すように
なる。
Where (γ ou + Δρ th + Δρ tr + Δ
By sending ρ mh ) as the overlay channel correction data, the corrected pseudo range ρ o ′ in the user GPS receiver D1 can be expressed by the following equation from equation (9).

【0028】[0028]

【数9】 [Equation 9]

【0029】以上 (6)式と(10)式は共通の誤差である−
(Δρuc−Δρmc)+(Δρuh−Δρmh)を持っている
ため、SAに影響されることなく擬似GPS信号を使用
しての測位が可能となる。
Equations (6) and (10) above are common errors −
Since it has (Δρ uc −Δρ mc ) + (Δρ uh −Δρ mh ), it is possible to perform positioning using the pseudo GPS signal without being affected by SA.

【0030】したがって、上記のユーザクロック同期方
式を採用した擬似GPS信号送出システムは、擬似GP
S信号を利用してDGPS補正及び測距を行う場合に、
SAによる時刻誤差を回避することができ、これによっ
てユーザGPS受信機の測位精度を維持することができ
る。
Therefore, the pseudo GPS signal transmission system adopting the above-mentioned user clock synchronization system is a pseudo GP.
When performing DGPS correction and distance measurement using S signal,
The time error due to SA can be avoided, and the positioning accuracy of the user GPS receiver can be maintained.

【0031】尚、上記実施例の動作説明ではオーバーレ
イの場合について述べたが、この方式は静止衛星を介さ
ずに直接ユーザGPS受信機に擬似GPS信号を伝送す
るシュードライトについても同様に実施可能である。そ
の他、この発明の要旨を変更しない範囲で種々変形して
も実施可能であることはいうまでもない。
In the above description of the operation of the embodiment, the case of overlay has been described, but this method can be similarly applied to a pseudolite that directly transmits a pseudo GPS signal to the user GPS receiver without passing through a geostationary satellite. is there. Needless to say, the present invention can be implemented in various ways without departing from the spirit of the invention.

【0032】[0032]

【発明の効果】以上述べたようにこの発明によれば、基
準局とユーザGPS受信機間の測距精度にSAによるG
PS時刻モニタ誤差の影響を与えず、これによってユー
ザGPS受信機の測位精度を維持することのできる基準
局の擬似GPS信号送出システムを提供することができ
る。
As described above, according to the present invention, the distance measurement accuracy between the reference station and the user GPS receiver can be improved by the SA
It is possible to provide a pseudo GPS signal transmission system of a reference station that can maintain the positioning accuracy of the user GPS receiver without affecting the PS time monitor error.

【図面の簡単な説明】[Brief description of drawings]

【図1】 この発明に係る基準局の擬似GPS信号送出
システムの一実施例の構成を示すブロック回路図であ
る。
FIG. 1 is a block circuit diagram showing a configuration of an embodiment of a pseudo GPS signal transmission system of a reference station according to the present invention.

【図2】 図2はオーバーレイの基本概念図を示す図で
ある。
FIG. 2 is a diagram showing a basic conceptual diagram of an overlay.

【符号の説明】[Explanation of symbols]

A…基準局、A1…モニタGPS受信機、11…受信
部、12…衛星データ検出部、13…パルス生成部、1
4…観測データ演算部、A2…GPS受信アンテナ、A
3…基準発振器、A4…データ処理装置、41…誤差デ
ータ算出部、43…送信データ生成部、A5…送信機、
51…PNコード発生部、52…擬似GPS信号生成
部、53…搬送波生成部、54…変調器、55…電力増
幅器、A6…GPS送信アンテナ、B…GPS衛星、C
…静止衛星、D…航行体、D1…ユーザGPS受信機、
D2…ユーザGPSアンテナ。
A ... Base station, A1 ... Monitor GPS receiver, 11 ... Reception unit, 12 ... Satellite data detection unit, 13 ... Pulse generation unit, 1
4 ... Observation data calculation unit, A2 ... GPS receiving antenna, A
3 ... Reference oscillator, A4 ... Data processing device, 41 ... Error data calculation unit, 43 ... Transmission data generation unit, A5 ... Transmitter,
51 ... PN code generator, 52 ... Pseudo GPS signal generator, 53 ... Carrier wave generator, 54 ... Modulator, 55 ... Power amplifier, A6 ... GPS transmitting antenna, B ... GPS satellite, C
... Geostationary satellite, D ... Navigation body, D1 ... User GPS receiver,
D2 ... User GPS antenna.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 地上に設置され、擬似GPS信号を送出
することでGPS衛星の一つとして利用される基準局の
擬似GPS信号送出システムにおいて、 GPS衛星からの電波を捕捉するGPS受信アンテナ
と、 このGPS受信アンテナを通じて各GPS衛星からのG
PS信号を受信する受信部、受信したGPS信号から衛
星データを検出する衛星データ検出部、基準クロックに
同期したユーザクロックパルスを生成するパルス生成
部、そのパルスに基づいて受信したGPS信号から観測
データを求める観測データ演算部を備えるモニタGPS
受信機と、 このモニタGPS受信機で得られた衛星データ、観測デ
ータから送信元のGPS衛星と既知の受信点間の理論距
離に対するシュードレンジ誤差値を算出する誤差データ
算出部、これらのデータについて所定のデータフォーマ
ット化を行って送信データを生成する送信データ生成部
を備えるデータ処理装置と、 スペクトラム拡散用のPNコードを前記ユーザクロック
パルスに時刻同期させて発生するPNコード発生部、こ
こで生成されたPNコードと前記データ処理部からの送
信データとを前記ユーザクロックパルスに基づいて合成
することで擬似GPS信号を生成する擬似GPS信号生
成部、前記基準クロックに同期した搬送波信号を生成す
る搬送波生成部、ここで生成された搬送波信号を前記擬
似GPS信号で変調する変調器、この変調器の出力を電
力増幅する電力増幅器を備える送信機と、 前記送信機からの擬似GPS信号を任意の方向に向けて
送出する送信アンテナとを具備し、 前記送信アンテナから送出される擬似GPS信号を直接
または特定の静止衛星を介してユーザGPS受信機に伝
送するようにしたことを特徴とする基準局の擬似GPS
信号送出システム。
1. In a pseudo GPS signal transmitting system of a reference station which is installed on the ground and is used as one of GPS satellites by transmitting a pseudo GPS signal, a GPS receiving antenna for capturing radio waves from a GPS satellite, G from each GPS satellite through the GPS receiving antenna
A receiving unit that receives a PS signal, a satellite data detecting unit that detects satellite data from the received GPS signal, a pulse generating unit that generates a user clock pulse synchronized with a reference clock, and observation data from a GPS signal received based on the pulse GPS equipped with observation data calculator
Receiver, satellite data obtained by this monitor GPS receiver, error data calculation unit that calculates pseudo range error value for theoretical distance between GPS satellite of transmission source and known reception point from observation data, and these data A data processing device including a transmission data generation unit that performs predetermined data formatting to generate transmission data, and a PN code generation unit that generates a PN code for spread spectrum time synchronization with the user clock pulse. A pseudo GPS signal generation unit that generates a pseudo GPS signal by synthesizing the generated PN code and the transmission data from the data processing unit based on the user clock pulse, and a carrier wave that generates a carrier signal synchronized with the reference clock. Generation unit, modulator that modulates the carrier signal generated here with the pseudo GPS signal A pseudo GPS that is equipped with a transmitter that includes a power amplifier that amplifies the output of the modulator and a transmission antenna that transmits the pseudo GPS signal from the transmitter in an arbitrary direction, and that transmits the pseudo GPS signal from the transmission antenna. Pseudo GPS of the reference station, characterized in that the signal is transmitted to the user GPS receiver directly or through a specific geostationary satellite
Signal transmission system.
JP26067993A 1993-10-19 1993-10-19 Pseudo GPS signal transmission system for reference station Expired - Fee Related JP3187222B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP26067993A JP3187222B2 (en) 1993-10-19 1993-10-19 Pseudo GPS signal transmission system for reference station
US08/324,503 US5440491A (en) 1993-10-19 1994-10-18 Pseudo GPS signal transmitting system in a base station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26067993A JP3187222B2 (en) 1993-10-19 1993-10-19 Pseudo GPS signal transmission system for reference station

Publications (2)

Publication Number Publication Date
JPH07113860A true JPH07113860A (en) 1995-05-02
JP3187222B2 JP3187222B2 (en) 2001-07-11

Family

ID=17351274

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3187222B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2379817A (en) * 2001-04-25 2003-03-19 Parthus Mobile communications apparatus including GPS
US6901265B2 (en) 2001-04-25 2005-05-31 Parthus (Uk) Limited Mobile communication apparatus
JP2007017184A (en) * 2005-07-05 2007-01-25 Funai Electric Co Ltd Device for transmitting positioning signal, positioning system equipped with such device, and system for transmitting positioning signal
JP2009145360A (en) * 2001-11-02 2009-07-02 Locata Corp Pty Ltd Method and device for chronologically synchronizing location network

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2379817A (en) * 2001-04-25 2003-03-19 Parthus Mobile communications apparatus including GPS
GB2379817B (en) * 2001-04-25 2005-04-13 Parthus Mobile communication apparatus
US6901265B2 (en) 2001-04-25 2005-05-31 Parthus (Uk) Limited Mobile communication apparatus
JP2009145360A (en) * 2001-11-02 2009-07-02 Locata Corp Pty Ltd Method and device for chronologically synchronizing location network
JP2009150906A (en) * 2001-11-02 2009-07-09 Locata Corp Pty Ltd Method and device for chronologically synchronizing location network
JP2007017184A (en) * 2005-07-05 2007-01-25 Funai Electric Co Ltd Device for transmitting positioning signal, positioning system equipped with such device, and system for transmitting positioning signal

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