JPS61198073A - Gps receiving device - Google Patents

Abstract

PURPOSE:To measure quickly the present position of a moving body, when a power source has been turned on, by providing a track data availability discriminating means, etc., and executing position measurement from stored track data, when the recollection has become unnecessary. CONSTITUTION:A radio wave from a GPS satellite is received by a reception processing part 12, and track data, etc. of each satellite are calculated and stored in a reception processing part use memory 14. On the other hand, time data of the track data is stored in a track data collecting time memory 16. When a power source is turned on again after the power source has been cut off, a collection time data T1 of the previous time and the present time data T2 are read out, and supplied to a track data availability discriminator 22. In this state, when a signal for making a recollection of the track data unnecessary has been received in the discriminator 22, the reception processing part 12 executes position measurement by the data which has been collected and stored before the power source is cut off. As a result, the collecting of the track data is unnecessary, and the position measurement can be executed quickly from the time when the power source is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on Global Positioning Systems.
Regarding receiving devices using GPS (hereinafter referred to as GPS), in more detail, GPS is a GPS system that makes it possible to quickly determine the current position of ships, automobiles, etc. when the power is turned on.
This invention relates to a PS receiving device.

For users who move from time to time, such as ships and aircraft,
In recent years, the effectiveness of GPS positioning devices has been attracting attention because they transmit radio waves from a plurality of artificial satellites to confirm or determine their current positions, traveling speeds, and the like. This GPS positioning device has the following characteristics: (1) It can be used continuously all over the world at any time, (2) It has extremely high accuracy in measuring position and speed, and (2) There is no limit to the number of users.

From this point of view, objects using GPS positioning devices are not limited to ships and aircraft, but should also include automobiles. In particular, if it can be used to avoid traffic congestion in urban areas, confirm one's current location in a short time, and find detours to a destination, it can have significant time and economic benefits. Good morning.

By the way, in conventional GPS receivers, when the power is turned on, three to four G
Positioning is performed after selecting a PS satellite, receiving signals from the selected satellite, and collecting orbit data.

For this reason, it takes a considerable amount of time to collect GPS satellite orbit data from the time the power is turned on until the position is measured.
The disadvantage is that it takes a considerable amount of time to wait from when the power is turned on until positioning is determined. For example, when the position of a car is measured using a GPS receiving device, this becomes an inconvenience in that the positioning cannot be performed immediately when the power is turned on.

The present invention has been made in order to overcome the above-mentioned disadvantages, and the present invention has been made to enable the collection time and real time of the orbit data of the GPS satellites collected immediately before the previous power cut-off, when the power is turned on to the GPS receiver. It is determined whether the previously collected orbit data can be used for the current positioning calculation based on the current time according to the clock, and if it can be used, after the power is turned on, the GPS
GP that makes it possible to omit the collection of satellite orbit data and measure the current position using the previously collected orbit data
The purpose of the present invention is to provide an S receiving device.

In order to achieve the above object, the present invention provides a GPS receiving device that receives radio waves from GPS satellites and measures the position, which stores the time at which the orbital data of the GPS satellites is received and collected, and which is backed up when the power is cut off. orbit data collection time storage means; orbit data storage means that stores the orbit data and is backed up even when the power is turned off; a real time clock that is backed up and stores the real time even when the power is turned off; orbit data usability determining means for determining whether re-collection of orbit data is necessary or unnecessary based on whether the difference between the real time output from the real time clock and the time read from the orbit data collection time storage means is within a predetermined value; When it is determined that re-collection is not necessary by the output of the orbit data usability determination means, positioning is performed from the orbit data read from the orbit data storage means, and on the other hand, when re-collection of the orbit data is required, The feature is that new orbit data is collected and positioning is performed from this collected orbit data.

Next, preferred embodiments of the GPS receiving device according to the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 1 shows a block diagram showing the configuration of an embodiment of the present invention.

Therefore, the output side of the antenna 10 is connected to a reception processing section 12, and the output side of this reception processing section 12 is connected to a reception processing section memory 14, an orbit data collection time memory 16, a display section 18, and a real-time clock 20. On the other hand, the memo 4 for the reception processing section is connected to send the stored contents to the reception processing section 12, and the orbit data usability discriminator 2
The output side of 2 is connected to the reception processing section 12. Note that the output side of the orbit data collection time memory 16 and the real-time clock 20 is connected to the orbit data availability discriminator 2.
Connect it to 2.

Therefore, signals sent from a plurality of GPS satellites (not shown) via the antenna 10 are processed by a reception processing unit that collects orbit data of each satellite from the received signal and measures pseudo distances from each satellite to the antenna 10. 12. The reception processing unit 12 supplies the collected trajectory data and positioning pseudorange data to the reception processing unit memory 14 for storage, and
The orbit data collection time is supplied to the orbit data collection time memory 16 and stored, and the position, altitude, time, etc. are measured with high precision and instantaneously from this data.

Next, the data measured by the reception processing section 12 is supplied to the display section 1 and displayed numerically or as a track on a map figure. Further, the memo 4 for the reception processing section and the orbit data collection time memory 16 are backed up by, for example, a storage battery, and maintain storage operations even during power cutoff.

On the other hand, the real-time clock 20 is calibrated based on time information measured by the reception processing unit I2, and, for example,
It is backed up by a storage battery and maintains memory operation even when the power is cut off. The stored collection time data in the orbit data collection time memory 16 and the time data from the real-time clock 20 are used as an orbit data usability discriminator that determines whether or not the previously collected orbit data can be used for the current positioning calculation when the power is turned on. 22, and the determination output of this orbit data usability determiner 22 is supplied to the reception processing section 12.

Next, regarding the operation of the present invention configured as above,
This will be explained in more detail along the flowchart shown in FIG.

Radio waves from GPS satellites are received by the reception processing unit 12 via the antenna 10, amplified and demodulated in the reception processing unit 12, the demodulated data is subjected to arithmetic processing, and orbit data and pseudorange data of each satellite are calculated from the demodulated data. These data are stored in the reception processing unit memory 14.

Further, position, altitude, and time data are instantaneously calculated from the data read out from the memory 14 for the reception processing unit, and this calculated data is supplied to the display unit 18.
As mentioned above, the date is displayed numerically or as a track on a map.

On the other hand, the orbit data of each satellite obtained through the arithmetic processing by the reception processing section 12 is stored in the reception processing section memory 14, and the time data when the orbit data was collected is stored in the orbit data collection time memory 16. .

Therefore, even when the necessary positioning is completed and the power is cut off, the memory contents of the reception processing section memo IJ14, the memory contents of the orbit data collection time memory 16, and the clock data of the real-time clock 20 are retained as described above. As expected, it is maintained for back-up amplification by storage batteries.

When the power is turned on again after the power is cut off, as shown in the flowchart in Figure 2, the orbit data collection time memory 1
The previous collection time data T stored in the real-time clock 20 is read out (step a), and the current time data T2 is read out from the real-time clock 20 (step b). Supplied. Then, in the trajectory data usability discriminator 22, the elapsed time ΔT from the collection time to the current time, that is, T2−T, =ΔT
data is calculated (step C).

The orbit data usability determiner 22 further compares the magnitude of the orbit data re-collection permissible elapsed time T3 and the elapsed time ΔT, which are preset corresponding to the moving object equipped with the CPS receiver (step d). . In step d, when ΔT≦T, the trajectory data availability discriminator 22 outputs a signal to the reception processing unit 12 indicating that re-collection of trajectory data is unnecessary (step e); on the other hand, if ΔT≦T, At this time, a signal indicating that re-collection of trajectory data is necessary is output to the reception processing section 12 (step f).

Therefore, the reception processing unit 12 that received the signal that re-collection of orbit data is unnecessary in step e uses the orbit data of each satellite that was collected before the power was cut off and stored in the reception processing unit memory 14. Positioning is performed. As a result, there is no need to collect orbit data, and positioning can be performed immediately after power is turned on.

Further, when receiving a signal indicating that trajectory data re-collection is necessary in step f, the reception processing unit 12 collects a plurality of G
Receive signals from PS satellites and collect orbit data,
Positioning will be done from the collected orbit data.

As explained above, according to the present invention, when the orbit data re-collection allowable elapsed time (T3)≧the elapsed time (ΔT), the stored orbit data before power-on can be used, and the orbit data from each satellite can be used. Therefore, when the power is turned on, the current position of the moving object can be immediately measured.

Furthermore, when the GPS receiving device of the present invention is mounted on a car,
This means that the current position of the vehicle can be measured immediately after the power is turned on.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the embodiment of the present invention. 10...Antenna 12...Reception processing unit 14...
Reception processing unit memory 16...orbit data collection time memory 18...display unit 20...real-time clock

Claims (1)

[Claims] (1) In a GPS receiving device that measures a position by receiving radio waves from a GPS satellite, an orbit data collection time storage means that stores the time at which the orbit data of the GPS satellite is received and is backed up when the power is cut off; an orbit data storage means that stores orbit data and is backed up even when the power is turned off; a real time clock that is backed up and stores the real time even when the power is turned off; and a real time that is output from the real time clock when the power is turned on. and a trajectory data usability determination means for determining whether re-collection of the trajectory data is necessary or unnecessary based on whether or not the difference between the time and the time read from the trajectory data collection time storage means is within a predetermined value. When it is determined that re-collection is not necessary based on the output of the means, positioning is performed from the orbit data read out from the orbit data storage means, while when it is necessary to re-collect the orbit data, new orbit data is collected and this collection is performed. A GPS receiving device characterized by performing positioning from orbit data.