JPH09251068A - Differential gps reference station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the interruption of transmission of correction quantity information by providing a plurality of GPS measuring parts, or the like to measure the position of reference station by receiving the GPS signals and to send failure signals on the basis of self diagnosis as well. SOLUTION: GPS satellite signals are divided by a divider 6 and they are sent to both GPS measuring parts 2a and 2b, which measure the position of a reference station. The positional information of reference station and the information on absolute position of the reference station are used to compute a correction quantity information necessary for differential processing by a correction quantity computing part 3a, and the result is transmitted from a transmitting part 4 through an antenna 5. In the case where a failure occurs in the part 2a, a failure signal is sent from the part 2a according to its self diagnosis. When the failure signal is received by a monitoring change-over part 7 sends a change-over signal to the computing part 3a. Thus, the computing part 3a changes over the part 2b and the information on the computed correction quantity is sent to the transmission part 4. The part 2a comes into waiting state for repair of failures.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a differential GPS reference station. Differential G here
The PS reference station is a station that is installed at a definite position and that transmits correction amount information based on the difference between the position measured by receiving a signal from a GPS satellite and the position where the position is set.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional differential GPS.
It is a block diagram which shows the structure of a reference | standard station. In a conventional differential GPS reference station, a signal from a GPS satellite is received by an antenna 1, a preamplifier 8 built in the antenna 1 amplifies the signal, and the G from the preamplifier 8 is received.
The GPS positioning unit 2 receives the PS satellite signal, and the GPS positioning unit 2 measures the position of the differential GPS reference station (in this specification, the differential GPS reference station position is also simply referred to as the reference station position). The correction amount calculation unit 3 calculates a correction amount necessary for the differential processing from the reference station position information measured by the GPS positioning unit 2 and the absolute position information of the reference station, and the calculated correction amount information is transmitted via the transmission unit 4. It transmits from the antenna 5.

[0003]

However, in the conventional differential GPS reference station configured as described above, when a malfunction occurs in the GPS positioning unit, the transmission of the correction amount information is interrupted during the replacement work of the GPS positioning unit. Then, during this period, the user cannot receive the correction amount information.

The present invention solves this kind of problem, and an object of the present invention is to provide a differential GPS reference station that prevents interruption of transmission of correction amount information.

[0005]

A differential GPS reference station according to the present invention includes a plurality of GPS positioning means for receiving a GPS signal to measure the position of the reference station and sending a failure signal based on self-diagnosis, and the plurality of GPS positioning means. The correction amount information necessary for the differential processing is calculated by receiving the reference station position information measured by the positioning means, and the abnormal GPS positioning means is determined by the calculation correction amount information based on the reference station position information sent from each GPS positioning means. Correction signal calculating means for transmitting an abnormal signal by means of the above, a transmitting means for transmitting the correction amount information calculated by the correction amount calculating means, a GPS positioning means for transmitting the failure signal upon receiving the failure signal and the abnormal signal, and the abnormal signal The GPS positioning means that is the source of the The features.

Differential GPS according to the present invention
According to the reference station, a plurality of GPS positioning means are provided,
The GPS positioning means that has been determined to be defective or abnormal by the failure signal or the abnormal signal is switched to the standby state by the monitoring switching means.

Therefore, when the GPS positioning means in operation is out of order, the GPS positioning means on the standby side is switched to the operation side instead of the GPS positioning means on the current operation side, and the transmission of the correction amount information is continued. As a result, it is possible to prevent the correction amount information from being disabled even during the replacement work of the failed GPS positioning means, and to prevent the interruption of the user service due to the replacement work.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A differential GPS reference station according to the present invention will be described below with reference to embodiments.
FIG. 1 is a block diagram showing the configuration of a differential GPS reference station according to an embodiment of the present invention. The same reference numerals as those shown in FIG. 2 indicate the same components.

A signal from a GPS satellite is received by an antenna 1, the received GPS signal is amplified by a preamplifier 8 and supplied to a distributor 6, and this GPS signal is supplied to GPS positioning units 2a and 2b. . G based on this GPS signal
The PS positioning units 2a and 2b measure the position of the reference station. Note that the GPS positioning units 2a and 2b send out a failure signal based on self-diagnosis when a failure occurs. Further, one of the GPS positioning units 2a and 2b is on the operating side, and the GPS positioning unit on the operating side supplies power to the preamplifier 8 via the distributor 6.

The GPS positioning units 2a and 2b measure the position of the reference station, and the reference station position information based on the measured position of the reference station is sent to the correction amount calculator 3a. GPS positioning unit 2
The correction amount information necessary for the differential processing is calculated in the correction amount calculation unit 3a from the reference station position information and the absolute position information of the reference station sent from a and 2b, and the calculated correction amount information is supplied to the transmission unit 4. The signal is transmitted from the antenna 5 via the transmitter 4.

In addition to the above-described calculation of the correction amount information, the correction amount calculation unit 3a determines the abnormal GPS positioning unit based on the calculation correction amount information based on the reference station position information sent from the GPS positioning units 2a and 2b to determine the abnormal signal. Is sent. Here, when the correction amount information is calculated by a signal based on the measured position information of the reference station, when the calculated correction amount information exceeds a predetermined correction amount information, the G
The PS positioning unit is determined to be abnormal, and an abnormal signal based on this GPS positioning unit is transmitted.

The failure signal and the abnormal signal are sent to the monitoring switching unit 7, and the monitoring switching unit 7 issues the failure signal or the abnormal signal when the GPS positioning unit issues the failure signal and the GPS positioning that is the source of the abnormal signal. Switch to standby mode.

In the differential GPS reference station according to the embodiment of the present invention configured as described above,
If the GPS positioning units 2a and 2b are normal, and GP
It is assumed that the S positioning unit 2a is the GPS positioning unit on the operating side.

Power is supplied to the preamplifier 8 from the GPS positioning section 2a side via the distributor 6, and the GPS satellite signal from the preamplifier 8 which receives the GPS signal is distributed by the distributor 6 and is constantly distributed. It is sent to both the GPS positioning units 2a and 2b, and the GPS positioning units 2a and 2b both measure the reference station position. The reference station position information based on the measured reference station position is sent to the correction amount calculation unit 3a, and the correction amount information necessary for the differential processing is sent to the correction amount calculation unit 3a from the sent reference station position information and the absolute position information of the reference station. Is calculated. The correction amount information calculated by the correction amount calculation unit 3a based on the reference station position information transmitted from the GPS positioning unit 2a is transmitted to the transmission unit 4 and transmitted via the antenna 5.

When the GPS positioning unit 2a on the operating side fails in this state, a failure signal is sent from the GPS positioning unit 2a. Upon receiving the failure signal from the GPS positioning section 2a, the monitoring switching section 7 determines the failure signal from the GPS positioning section 2a upon receiving the failure signal, sends the switching signal to the distributor 6, and at the same time calculates the correction amount computing section. A switching signal is sent to 3a.

In response to this switching signal, the distributor 6 is switched and power is supplied from the GPS positioning section 2b to the preamplifier 8 via the distributor 6. At the same time, in response to the switching signal, the correction amount calculation unit 3a is switched to send the correction amount information calculated by the correction amount calculation unit 3a based on the reference station position information from the GPS positioning unit 2b to the transmission unit 4, The correction amount information calculated based on the reference station position information from the GPS positioning unit 2b is sent to the transmitting unit 4 and is transmitted via the antenna 5. Therefore, the GPS positioning unit 2
a is placed in a standby state.

When the GPS positioning section 2a fails in this way, the correction amount information based on the reference station position information sent from the GPS positioning section 2b is transmitted instead of the reference station position information sent from the GPS positioning section 2a. Therefore, the transmission of the correction amount information is not interrupted. During this period, the GPS positioning unit 2a is replaced or repaired.

When the correction amount information calculated by the GPS positioning unit 2a on the operating side based on the reference station position information exceeds the predetermined correction amount information, an abnormal signal is sent from the correction amount calculating unit 3a to the monitoring switching unit 7 Is sent to the distributor 6 from the GPS positioning unit 2b based on the switching signal from the monitoring switching unit 7 as in the case where the failure signal is transmitted to the distributor 6.
The power is supplied to the preamplifier 8 via the GPS positioning unit 2b, and the correction amount information calculated based on the reference station position information from the GPS positioning unit 2b is transmitted via the antenna 5.
a is switched to the standby state, and the GPS positioning unit 2b is used as the operation-side GPS positioning unit.

When the fault is repaired, the standby side G
GPS satellite signals are supplied to the PS positioning unit 2a, and the GPS satellites are being tracked even during standby.
Even if the GPS positioning unit 2b is switched to the standby side and the GPS positioning unit 2a is switched to the operating side due to a malfunction of the positioning unit 2b, after the switching, the initialization process is not performed.
The correction amount information will be transmitted immediately.

[0020]

As described above, according to the differential GPS reference station of the present invention, it is possible to minimize the interruption of the transmission of the correction amount information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a differential GPS reference station according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional differential GPS reference station.

[Explanation of symbols]

1 and 5 ... Antennas 2a, 2b ...
GPS positioning unit 3a ... Correction amount calculation unit 4 ... Transmission unit 6 ... Distributor 7 ... Monitoring switching unit 8 ... Preamplifier

Claims (1)

[Claims] 1. A plurality of Gs for receiving a GPS signal to determine the position of a reference station and sending a failure signal based on self-diagnosis.
The PS positioning means and the reference station position information measured by the plurality of GPS positioning means are received to calculate correction amount information necessary for the differential processing, and the respective GPs are calculated.
The correction amount calculation unit that determines the abnormal GPS positioning unit based on the calculated correction amount information based on the reference station position information sent from the S positioning unit and sends an abnormal signal, and the correction amount information calculated by the correction amount calculation unit is transmitted. Transmitting means and G for sending the failure signal in response to the failure signal and the abnormal signal
A differential GPS reference station, comprising: a PS positioning means and a monitoring switching means for switching a GPS positioning means which is a source of an abnormal signal to a standby state.