JP3269229B2 - Mobile station location management system - Google Patents
Mobile station location management systemInfo
- Publication number
- JP3269229B2 JP3269229B2 JP31421093A JP31421093A JP3269229B2 JP 3269229 B2 JP3269229 B2 JP 3269229B2 JP 31421093 A JP31421093 A JP 31421093A JP 31421093 A JP31421093 A JP 31421093A JP 3269229 B2 JP3269229 B2 JP 3269229B2
- Authority
- JP
- Japan
- Prior art keywords
- mobile station
- time
- base station
- positioning
- management system
- 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 - Lifetime
Links
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- Navigation (AREA)
- Traffic Control Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はＧＰＳ（Ｇｌｏｂａｌ
Ｐｏｓｉｔｉｏｎｉｎｇ Ｓｙｓｔｅｍ）衛星を使用し
て移動局の位置を正確に標定する移動局位置管理システ
ムに関する。The present invention relates to a GPS (Global).
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile station position management system for accurately locating a mobile station using a Positioning System (SAT) satellite.
【０００２】[0002]
【従来の技術】車両等に搭載されて移動する移動局の位
置を正確に標定し管理するシステムは、ナビゲーション
や交通管制等の各システムの前提となるものであり、近
年、かかる移動局の位置検出に、米国の打ち上げたＧＰ
Ｓ衛星を利用することが試みられている。これは地球周
回軌道を回る３個ないし４個の測位用静止衛星の発信電
波を受信して、三角測量の原理により自己の位置を知る
もので、地磁気センサを使用した場合の如き外乱の影響
を受けることが少なく、また、ジャイロの如く相対位置
しか知り得ないという問題もない。2. Description of the Related Art A system for accurately locating and managing the position of a mobile station mounted on a vehicle or the like and moving is a prerequisite for various systems such as navigation and traffic control. United States launched GP to detect
Attempts have been made to use the S satellite. It receives the radio waves from three or four geostationary satellites orbiting the Earth orbit and knows its position by the principle of triangulation. The influence of disturbance such as when a geomagnetic sensor is used is known. There is no problem of receiving only a relative position unlike a gyro.
【０００３】しかし、ＧＰＳ衛星からの測位信号は、主
に米国の国防上の理由から意図的にその軌道データが変
動させられており、正確な位置決めには未だ問題があ
る。そこで、例えば特開平４−３５４０９８号公報に
は、固定されてその位置が予め正確に決定されている基
地局においてもＧＰＳ衛星の電波を受信し、測位された
基地局の位置と実際の位置との誤差を算出して、この誤
差を補正値として移動局より送信された移動位置のデー
タを補正するようにしたものが示されている。However, the positioning signal from a GPS satellite has its orbit data fluctuated intentionally mainly for the purpose of the U.S. national defense, and there is still a problem in accurate positioning. Therefore, for example, Japanese Patent Laid-Open Publication No. Hei 4-354098 discloses that a base station whose position is fixed and whose position is accurately determined in advance also receives radio waves of GPS satellites, and determines the position of the measured base station and the actual position. Is calculated, and the data of the moving position transmitted from the mobile station is corrected using the error as a correction value.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記公報記載
のシステムでは、移動局で測位して移動位置データを発
信した後、基地局において他の移動局のデータ処理が終
わるまで処理が遅れたり、また、パケット交換網等の中
継装置を持つ通信手段を使用する場合にはトラヒック混
雑等で通信が遅れると、この遅れ時間の間に補正値（Ｇ
ＰＳ衛星の軌道データ中に含まれる誤差量）が変化して
しまい、先に標定された当該移動局の位置を適正に補正
することができないという問題がある。However, in the system described in the above publication, after the mobile station measures the position and transmits the moving position data, the processing is delayed until the data processing of the other mobile station is completed in the base station. When communication means having a relay device such as a packet switching network is used, if communication is delayed due to traffic congestion or the like, the correction value (G
The error amount included in the orbit data of the PS satellite changes, and there is a problem that the previously located position of the mobile station cannot be properly corrected.
【０００５】ここでトラヒック混雑について図５を使用
して説明する。図において、ネットワークセンタ６、複
数の制御局４Ａ，４Ｂ、複数の基地局２Ａ，２Ｂがパケ
ット交換網５により互いに結ばれている。移動局１Ａか
らのデータは無線により制御局４Ａへ送信され、パケッ
ト交換網５を通してネットワークセンタ６に送られる。
ネットワークセンタ６ではデータ中に含まれる送り先の
情報から該当の基地局、例えば２Ａにパケット交換網５
を通してデータを送る。ここで、他の移動局１Ｂからも
制御局４Ｂを経てネットワークセンタ６に対して通信要
求があると、ネットワークセンタ６ではこれらのデータ
通信を順番に処理することになるから、通信要求が多数
重なっていわゆるトラヒックが混雑し、通信に遅れが生
じることになる。Here, traffic congestion will be described with reference to FIG. In the figure, a network center 6, a plurality of control stations 4A and 4B, and a plurality of base stations 2A and 2B are interconnected by a packet switching network 5. Data from the mobile station 1A is wirelessly transmitted to the control station 4A and transmitted to the network center 6 through the packet switching network 5.
The network center 6 sends the packet-switched network 5 to a corresponding base station, for example, 2A, based on the destination information contained in the data.
Send data through. Here, if there is a communication request from another mobile station 1B to the network center 6 via the control station 4B, the network center 6 processes these data communications in order, so that a large number of communication requests overlap. Therefore, so-called traffic is congested, and communication is delayed.
【０００６】本発明はかかる課題を解決するもので、Ｇ
ＰＳ衛星の測位信号が変動しても常に正確な移動局の移
動位置を標定できる移動局位置管理システムを提供する
ことを目的とする。[0006] The present invention solves such a problem.
It is an object of the present invention to provide a mobile station position management system capable of always locating an accurate mobile station position even if a positioning signal of a PS satellite fluctuates.
【０００７】[0007]
【課題を解決するための手段】本発明の構成を図４で説
明すると、ＧＰＳ衛星の測位信号を受信して自己の移動
位置を標定する手段と、標定した時刻を検出する手段
と、上記移動位置と標定時刻を基地局へ送信する手段と
を移動局に設け、一方、経時的に上記ＧＰＳ衛星の測位
信号を受信して自己の位置を標定する手段と、標定され
た自己の位置と予め定められた自己の位置との位置誤差
を算出する手段と、算出された位置誤差をその算出時刻
と共に時系列的に記憶する手段と、上記移動局より受信
した標定時刻に最も近い上記算出時刻における位置誤差
により上記移動位置を補正する手段とを基地局に設けた
ものである。The structure of the present invention will be described with reference to FIG. 4. A means for receiving a positioning signal of a GPS satellite to determine its own moving position, a means for detecting the time at which it has been located, A means for transmitting the position and the locating time to the base station is provided in the mobile station. On the other hand, means for receiving the positioning signal of the GPS satellite over time and locating its own position, Means for calculating a position error with respect to the determined own position, means for storing the calculated position error in chronological order together with the calculated time, and means for calculating the position error closest to the location time received from the mobile station. Means for correcting the moving position based on a position error is provided in the base station.
【０００８】[0008]
【作用】上記構成において、ＧＰＳ衛星の測位信号が経
時的に変動するとこれは基地局における位置誤差となっ
て現れる。この位置誤差は基地局で時系列的に記憶さ
れ、移動局が自己の移動位置を標定した時刻に最も近い
時刻における位置誤差により上記移動位置が補正され
る。したがって、ＧＰＳ衛星の測位信号が経時的に変動
してもこれに関係なく常に正確な移動位置が知られる。In the above configuration, if the positioning signal of the GPS satellite fluctuates with time, this appears as a position error in the base station. This position error is stored in the base station in time series, and the moving position is corrected by the position error at the time closest to the time when the mobile station has located its own moving position. Therefore, even if the positioning signal of the GPS satellite fluctuates with time, an accurate moving position is always known regardless of this.
【０００９】[0009]
【実施例】図１には移動局位置管理システムの全体構成
を示す。図において、移動局１は車両等に搭載されてそ
の二次元座標、すなわち経度と緯度が時々刻々変化す
る。一方、基地局２は管理センター内に設置され、その
経度と緯度は予め他の測量方法で正確に標定されてお
り、変化しない。FIG. 1 shows the overall configuration of a mobile station location management system. In the figure, a mobile station 1 is mounted on a vehicle or the like, and its two-dimensional coordinates, that is, longitude and latitude, change every moment. On the other hand, the base station 2 is installed in the management center, and its longitude and latitude are accurately located in advance by another survey method, and do not change.
【００１０】経度と緯度の二次元座標を知るには視野内
の３つのＧＰＳ衛星を使用すれば良い。そこで移動局１
では、各ＧＰＳ衛星３Ａ，３Ｂ，３Ｃより発信される、
軌道データおよび発信時刻データを含む測位信号をＧＰ
Ｓアンテナ１１で受け、これをＧＰＳ受信機１２で復調
してインターフェース１３を介してコンピュータ１４に
取り込む。コンピュータ１４では後述する手順で信号処
理を行い、処理後の信号をインターフェース１５を介し
て無線送信機１６に送り、ここで変調して無線アンテナ
１７を経て基地局２へ送信する。In order to know the two-dimensional coordinates of longitude and latitude, three GPS satellites in the field of view may be used. So mobile station 1
Then, transmitted from each GPS satellite 3A, 3B, 3C,
GP for positioning signals including orbit data and transmission time data
The signal is received by the S antenna 11, demodulated by the GPS receiver 12, and taken into the computer 14 via the interface 13. The computer 14 performs signal processing according to a procedure described later, sends the processed signal to the wireless transmitter 16 via the interface 15, modulates the signal, and transmits the modulated signal to the base station 2 via the wireless antenna 17.
【００１１】基地局２では無線アンテナ２１で上記移動
局１から発信された変調信号を受信し、無線受信機２２
で復調してインターフェース２３を介しコンピュータ２
４へ入力する。また、ＧＰＳアンテナ２５とＧＰＳ受信
機２６により上記ＧＰＳ衛星３Ａ，３Ｂ，３Ｃからの測
位信号を受信復調し、インターフェース２７を介してコ
ンピュータ２４に入力する。コンピュータ２４は後述の
手順で移動局１の移動位置を標定し、これをディスプレ
イ２８の地図上に表示する。The base station 2 receives the modulated signal transmitted from the mobile station 1 by the radio antenna 21 and transmits the modulated signal to the radio receiver 22.
Demodulated by the computer 2 via the interface 23
Input to 4. Further, the positioning signal from the GPS satellites 3A, 3B, 3C is received and demodulated by the GPS antenna 25 and the GPS receiver 26, and is input to the computer 24 via the interface 27. The computer 24 locates the movement position of the mobile station 1 according to a procedure described later, and displays this on a map on the display 28.
【００１２】図２には、移動局１のコンピュータの信号
処理手順を示す。ステップ１０１で以後の処理に必要な
各種フラグ等の初期化を行う。続いて基地局２への送信
タイミングであるか確認する（ステップ１０２）。この
送信タイミングは前回の送信から一定時間経過したこと
を確認するものである。送信タイミングであれば、ＧＰ
Ｓ衛星３Ａ，３Ｂ，３Ｃからの測位信号に基づいて公知
の方法により移動局の経度ｘ(t2)、緯度y(t2) を標定す
る（ステップ１０３）。ここで、t2は標定時刻である。
続いて、ステップ１０４で移動局１が搭載された車両番
号ｎ、標定時刻t2、移動位置（ｘ(t2)、y(t2) ）を基地
局２へ送信する。FIG. 2 shows a signal processing procedure of the computer of the mobile station 1. In step 101, various flags necessary for the subsequent processing are initialized. Subsequently, it is confirmed whether it is the transmission timing to the base station 2 (step 102). This transmission timing is to confirm that a certain time has elapsed from the previous transmission. For transmission timing, GP
Based on the positioning signals from the S satellites 3A, 3B, 3C, the longitude x (t2) and the latitude y (t2) of the mobile station are located by a known method (step 103). Here, t2 is the orientation time.
Subsequently, at step 104, the vehicle number n on which the mobile station 1 is mounted, the orientation time t2, and the movement position (x (t2), y (t2)) are transmitted to the base station 2.
【００１３】図３には、基地局２のコンピュータ２４の
信号処理手順を示す。ステップ２０１で以後の処理に必
要な各種フラグ等の初期化を行い、移動局１からの受信
があったか確認する（ステップ２０２）。受信がない場
合にはＧＰＳ衛星３Ａ，３Ｂ，３Ｃからの測位信号に基
づいて基地局２の経度ｐ(t1)、緯度ｑ(t1)を標定し（ス
テップ２０３）、下式により経度および緯度の補正値
（すなわち誤差量）δｘ(t1)、δｙ(t1)を算出する（ス
テップ２０４）。 δｘ(t1)＝ｐ(t1)−Ｐ δｙ(t1)＝ｑ(t1)−Ｑ ここでＰ，Ｑはそれぞれ基地局２の実際の経度と緯度
で、予め他の測量方法で正確に決定されている。また、
t1は標定時刻である。ステップ２０５では、標定時刻t1
とこの時の上記補正値δｘ(t1)、δｙ(t1)を、時刻t1の
順序で時系列的にメモリ内に記憶保存しておく。FIG. 3 shows a signal processing procedure of the computer 24 of the base station 2. In step 201, various flags and the like necessary for the subsequent processing are initialized, and it is confirmed whether or not reception from the mobile station 1 has been performed (step 202). When there is no reception, the longitude p (t1) and the latitude q (t1) of the base station 2 are located based on the positioning signals from the GPS satellites 3A, 3B and 3C (step 203), and the longitude and the latitude are calculated by the following equation. Correction values (that is, error amounts) δx (t1) and δy (t1) are calculated (step 204). δx (t1) = p (t1) −P δy (t1) = q (t1) −Q where P and Q are the actual longitude and latitude of the base station 2 and are accurately determined in advance by another surveying method. ing. Also,
t1 is the orientation time. In step 205, the orientation time t1
And the correction values δx (t1) and δy (t1) at this time are stored in the memory in time series in the order of the time t1.
【００１４】上記ステップ２０２で移動局１からの受信
があった場合には、続いて車両番号ｎ、標定時刻t2、移
動位置（ｘ(t2)、y(t2) ）の各データを取り込む（ステ
ップ２０６）。ステップ２０７では、メモリ内に記憶さ
れている補正値のうち、同一の標定時刻（すなわちt1＝
t2）における補正値（δｘ(t2)、δｙ(t2)）をメモリか
ら読み出し、続いて、この補正値（δｘ(t2)、δｙ(t
2)）を使用して下式により移動位置（ｘ(t2)、y(t2) ）
を補正して、正確な位置（ｘ´(t2)、y ´(t2)）を得
る。 ｘ´(t2)＝ｘ(t2)−δｘ(t2) y ´(t2)＝y(t2) −δｙ(t2) 補正後の移動位置（ｘ´(t2)、y ´(t2)）はステップ２
０９でディスプレイの地図上に表示される。If it is determined in step 202 that the data is received from the mobile station 1, the data of the vehicle number n, the orientation time t2, and the movement position (x (t2), y (t2)) are fetched (step 202). 206). In step 207, among the correction values stored in the memory, the same orientation time (that is, t1 =
The correction values (δx (t2), δy (t2)) at (t2) are read from the memory, and subsequently, the correction values (δx (t2), δy (t)
2)) using the following formula to move the position (x (t2), y (t2))
Is corrected to obtain an accurate position (x ′ (t2), y ′ (t2)). x ′ (t2) = x (t2) −δx (t2) y ′ (t2) = y (t2) −δy (t2) The corrected movement position (x ′ (t2), y ′ (t2)) is a step. 2
At 09, it is displayed on the map on the display.
【００１５】かくして、移動局１においてＧＰＳ測位さ
れた位置（ｘ(t2)、y(t2) ）を、これと同時刻t2に基地
局２でＧＰＳ測位した際の誤差量で補正しているから、
補正後の位置（ｘ´(t2)、y ´(t2)）はＧＰＳ衛星の測
位信号の変動に無関係に、時刻t2における正確な車両位
置を示している。Thus, the position (x (t2), y (t2)) measured by the GPS in the mobile station 1 is corrected by the error amount when the GPS measurement is performed by the base station 2 at the same time t2. ,
The corrected position (x '(t2), y' (t2)) indicates an accurate vehicle position at time t2 irrespective of the fluctuation of the positioning signal of the GPS satellite.
【００１６】なお、移動局１の標定時刻t2に該当する基
地局２の標定時刻t1がない場合には、最も近い標定時刻
t1の補正値（δｘ(t1)、δｙ(t1)）を使用する。また、
上記実施例では経度、緯度のみの二次元測位について説
明したが、４つのＧＰＳ衛星を使用して高度を含めた三
次元測位をする場合にも本発明が適用できることはもち
ろんである。If there is no location time t1 of the base station 2 corresponding to the location time t2 of the mobile station 1, the nearest location time t1
The correction value of t1 (δx (t1), δy (t1)) is used. Also,
In the above-described embodiment, two-dimensional positioning using only longitude and latitude has been described. However, the present invention is of course applicable to three-dimensional positioning including altitude using four GPS satellites.
【００１７】上記実施例では移動局において処理遅れが
ある場合を問題としたが、既に説明したように、移動局
と基地局が無線で直接結ばれず、パケット通信網を介し
て結ばれる場合には通信のトラヒック遅れが無視できな
い大きさになることがあり、本発明が特に有効となる。In the above embodiment, the case where there is a processing delay in the mobile station has been a problem. However, as described above, in the case where the mobile station and the base station are not directly connected by radio but are connected via a packet communication network, The present invention is particularly effective because the traffic delay of communication may become a size that cannot be ignored.
【００１８】[0018]
【発明の効果】以上の如く、本発明の移動局位置管理シ
ステムによれば、測位信号が経時的に変動するＧＰＳ衛
星を使用して測位する場合に、基地局で他の移動局のデ
ータ処理のために待ちが生じ、あるいは通信に遅延が生
じても、各移動局の標定時における移動位置を常に正確
に把握することができる。As described above, according to the mobile station position management system of the present invention, when positioning is performed using a GPS satellite whose positioning signal fluctuates with time, the base station processes data of another mobile station. Therefore, even if a waiting occurs or a communication delay occurs, the moving position of each mobile station at the time of locating can always be accurately grasped.
【図１】移動局位置管理システムの全体ブロック構成図
である。FIG. 1 is an overall block configuration diagram of a mobile station location management system.
【図２】移動局コンピュータの処理フローチャートであ
る。FIG. 2 is a processing flowchart of a mobile station computer.
【図３】基地局コンピュータの処理フローチャートであ
る。FIG. 3 is a processing flowchart of a base station computer.
【図４】クレーム対応図である。FIG. 4 is a diagram corresponding to claims.
【図５】トラヒック混雑を説明するパケット通信網の構
成図である。FIG. 5 is a configuration diagram of a packet communication network for explaining traffic congestion.
１ 移動局 １１ ＧＰＳアンテナ １２ ＧＰＳ受信機 １４ コンピュータ １６ 無線送信機 １７ 無線アンテナ ２ 基地局 ２１ 無線アンテナ ２２ 無線受信機 ２４ コンピュータ ２５ ＧＰＳアンテナ ２６ ＧＰＳ受信機 ２８ ディスプレイ ３Ａ，３Ｂ，３Ｃ ＧＰＳ衛星 Reference Signs List 1 mobile station 11 GPS antenna 12 GPS receiver 14 computer 16 wireless transmitter 17 wireless antenna 2 base station 21 wireless antenna 22 wireless receiver 24 computer 25 GPS antenna 26 GPS receiver 28 display 3A, 3B, 3C GPS satellite
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01C 21/00 G01S 5/14 G08G 1/00 - 1/16 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G01C 21/00 G01S 5/14 G08G 1/00-1/16
Claims (1)
移動位置を標定する手段と、標定した時刻を検出する手
段と、上記移動位置と標定時刻を基地局へ送信する手段
とを移動局に設け、一方、経時的に上記ＧＰＳ衛星の測
位信号を受信して自己の位置を標定する手段と、標定さ
れた自己の位置と予め定められた自己の位置との位置誤
差を算出する手段と、算出された位置誤差をその算出時
刻と共に時系列的に記憶する手段と、上記移動局より受
信した標定時刻に最も近い上記算出時刻における位置誤
差により上記移動位置を補正する手段とを基地局に設け
たことを特徴とする移動局位置管理システム。1. A mobile station comprising: a means for receiving a positioning signal of a GPS satellite to determine its own moving position; a means for detecting the time at which the positioning is performed; and a means for transmitting the moving position and the positioning time to a base station. A means for receiving a positioning signal of the GPS satellite over time and locating its own position, and a means for calculating a position error between the located own position and a predetermined own position. A means for storing the calculated position error in chronological order together with the calculated time, and a means for correcting the moving position by the position error at the calculated time closest to the orientation time received from the mobile station to the base station. A mobile station location management system, which is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31421093A JP3269229B2 (en) | 1993-11-19 | 1993-11-19 | Mobile station location management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31421093A JP3269229B2 (en) | 1993-11-19 | 1993-11-19 | Mobile station location management system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07146995A JPH07146995A (en) | 1995-06-06 |
| JP3269229B2 true JP3269229B2 (en) | 2002-03-25 |
Family
ID=18050610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31421093A Expired - Lifetime JP3269229B2 (en) | 1993-11-19 | 1993-11-19 | Mobile station location management system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3269229B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931990A (en) * | 2015-06-11 | 2015-09-23 | 上海同想文化传播有限公司 | Golf course navigation map surveying and mapping method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3510720B2 (en) * | 1995-10-13 | 2004-03-29 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile data communication system |
| US6377208B2 (en) | 1997-02-21 | 2002-04-23 | Hughes Electronics Corporation | Method and system for determining a position of a transceiver unit utilizing two-way ranging in a polystatic satellite configuration |
| EP0860708B1 (en) | 1997-02-21 | 2005-07-27 | Hughes Electronics Corporation | Method and system for determining a position of a transceiver unit utilizing two-way ranging in a polystatic satellite configuration including a ground radar |
| US6104338A (en) * | 1998-05-04 | 2000-08-15 | Snaptrack, Inc. | Method and apparatus for operating a satellite positioning system receiver |
| US6229477B1 (en) | 1998-10-16 | 2001-05-08 | Hughes Electronics Corporation | Method and system for determining a position of a communication satellite utilizing two-way ranging |
| US7089000B1 (en) | 1999-03-18 | 2006-08-08 | The Directv Group, Inc. | Multi-node wireless communication system with multiple transponding platforms |
| US6246363B1 (en) | 1998-12-10 | 2001-06-12 | Hughes Electronics Corporation | Method and system for incorporating two-way ranging navigation as a calibration reference for GPS |
| US6337980B1 (en) | 1999-03-18 | 2002-01-08 | Hughes Electronics Corporation | Multiple satellite mobile communications method and apparatus for hand-held terminals |
| US6990314B1 (en) | 1999-03-18 | 2006-01-24 | The Directv Group, Inc. | Multi-node point-to-point satellite communication system employing multiple geo satellites |
| US7046718B1 (en) | 2000-09-25 | 2006-05-16 | The Directv Group, Inc. | Coherent phase synchronous code division multiple access communications from multiple transponder platforms |
| US6941107B2 (en) | 2001-01-19 | 2005-09-06 | The Directv Group, Inc. | Stratospheric platform based surface vehicle tracking and mobile data network |
| US7068733B2 (en) | 2001-02-05 | 2006-06-27 | The Directv Group, Inc. | Sampling technique for digital beam former |
| US6559797B1 (en) | 2001-02-05 | 2003-05-06 | Hughes Electronics Corporation | Overlapping subarray patch antenna system |
| US7565169B1 (en) * | 2002-12-10 | 2009-07-21 | Cisco Technology, Inc. | Access point with orientation sensor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61108982A (en) * | 1984-11-01 | 1986-05-27 | Furuno Electric Co Ltd | Position measuring system of mobile station |
| GB2241623A (en) * | 1990-02-28 | 1991-09-04 | Philips Electronic Associated | Vehicle location system |
| JPH04315077A (en) * | 1991-04-12 | 1992-11-06 | Sharp Corp | Gps position measurement system, moving station device for the system and base station device |
| JPH0527005A (en) * | 1991-07-18 | 1993-02-05 | Nippon Hoso Kyokai <Nhk> | Position detecting method |
-
1993
- 1993-11-19 JP JP31421093A patent/JP3269229B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931990A (en) * | 2015-06-11 | 2015-09-23 | 上海同想文化传播有限公司 | Golf course navigation map surveying and mapping method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07146995A (en) | 1995-06-06 |
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