JP3268021B2 - Operation control method of GPS receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a GPS (Global Posit
The present invention relates to a method for controlling the operation of a GPS receiver used for surveying using an ioning system.

[0002]

2. Description of the Related Art GPS is a system that utilizes an artificial satellite developed so that a moving object such as an aircraft or a ship can obtain the position and speed on the earth in real time. In addition to use by mobile objects, it is also used in the field of surveying for measuring the distance and direction between a certain point on the earth and a known point.

In a surveying method using GPS, a distance and a direction between points on the ground are obtained based on the position of a satellite. In this kind of surveying method, a GPS receiver is provided at a point on the earth to be surveyed. Is installed, and the phase of the radio wave transmitted from the satellite is received at predetermined intervals and recorded as phase data. Then, the phase data recorded at the survey point is brought back, and the distance and direction between the survey point and the known point are calculated by computer processing. In the computer processing in this case, the position of each satellite at each time when the phase is measured is also calculated. For the position of the satellite at each time, the radio wave transmitted from the satellite includes the orbit information of the satellite and the transmission time information of the radio wave. )
It can be obtained by solving the Kepler equation from this orbital element data.

Therefore, in such a surveying method,
For example, a memory card reader / writer is provided in a GPS receiver, and the above-described phase data and orbital element data are recorded on a memory card. Incidentally, in this type of surveying method, as an initial setting item, schematic coordinate value of the surveying point, a time difference of surveying points, lower altitude value of receivable satellites, measurement interval, there are etc. communication parameters, it was also set In a scheduled survey that starts and ends measurement at a time, it is necessary to set the start and end times of the survey and the name of the file to be written. This is stored in the internal memory of the GPS receiver, and the GPS receiver is operated according to the setting items. However, such a setting item input method has a problem described below.

[0005]

That is, in the above-described conventional method for inputting setting items, a large number of setting items such as initial settings and reservation settings are input by operating the keyboard of the receiver. However, since the keyboard of the receiver is relatively small, for example, input operations on site are quite difficult, which has been a factor that hinders the speed of surveying. In addition, some of the initial setting items are specific to the surveying site, and must be entered each time the receiver's use site changes, which is a very complicated task. Sex was inhibited.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a method of controlling the operation of a GPS receiver, which can ensure quick surveying.

[0007]

In order to achieve the above object, the present invention is to receive radio waves from a plurality of GPS satellites orbiting the earth, and to obtain phase data and orbital element data contained in the radio waves. In a GPS receiver that records on a memory card, initial setting items including rough coordinate values of survey points, coordinate values of known points, time difference of survey points, lower altitude values of receivable satellites, measurement intervals, communication parameters , and, start and end time of the survey, the pre <br/> about setting items including a write file name, are attached to the external computer notes
It is characterized in that the information is recorded on the memory card in advance using a recard reader / writer, and the GPS receiver is operated according to the setting conditions recorded on the memory card.

[0008]

According to the operation control method for a GPS receiver having the above-described configuration, setting items such as initial settings and reservation settings are recorded in a memory card in advance, and the GPS receiver is set in accordance with the setting conditions recorded in the memory card. Is activated, so G
When the PS receiver is installed at the surveying point, the conditions for starting the measurement are immediately established.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show one embodiment of a method for controlling the operation of a GPS receiver according to the present invention. The operation control method shown in the figure measures the distance and direction between a point A on the earth and a known point B (a point on the earth whose latitude, longitude and height are known in advance). In this case, a case where the present invention is applied is shown, and a GPS receiver 10 is installed at a point A, and receives radio waves transmitted from at least four satellites 12 orbiting the earth at the same time.

FIG. 2 shows a block diagram of the GPS receiver 10. As shown in FIG. 1, the GPS receiver 10 includes an analog signal processing unit A and a digital signal processing unit B. The analog signal processing unit A includes an antenna 10a configured by a microstrip antenna or the like, An RF amplifier 11a for amplifying the GPS signal received by the antenna 10a, and a local oscillator 12 for modulating the GPS signal amplified by the RF amplifier 11a and converting the carrier frequency.
a, and an IF amplifier 13a for amplifying the intermediate frequency band of the frequency-converted GPS signal.

On the other hand, a digital signal processor B receives a signal output from the IF amplifier 13a and converts a digital signal into analog information.
b, and a main CPU 11b that receives an output signal of the DSP 10b and performs predetermined signal processing on the output signal.
P10b is connected via a bus 12b, one end of which is connected to the main CPU 11b.

The bus 12b includes a memory 13b composed of a ROM, a RAM, and a backup RAM, an LCD display section 14b, a buzzer 15b, and an arithmetic processor 16b.
, A sub CPU 17b, a memory card reader / writer 18b, and a real-time clock 22b. A touch panel keyboard 19b, an I / O port 20b, and a power control unit 21b are connected to the sub CPU 17b.

The DSP 10b counts the carrier phase of the GPS signal, converts it into carrier phase data, extracts orbital element information from the GPS signal, converts it into digital orbital element data, and further converts the signal into a signal from the GPS signal. The transmission time information is extracted and digitized together with the time information (output of the real-time clock 22b) at the time of reception by the antenna 10a and converted into time data.

The arithmetic processor 16b performs processing such as time-consuming function calculations at high speed.
17b is responsible for processing of information input from the keyboard 19b, processing of information externally input via the I / O port 20b, and power control of the entire receiver. The main CPU 11b is in charge of controlling the entire receiver, and receives carrier phase data, orbital element data, and time data from the DSP 10b, and performs continuity of carrier wave data, formatting of orbital element data, and calculation of time. Memory card reader / writer 1
The information is written in a predetermined area of the memory card 14 via the interface 8b.

The memory card 14 is, for example, a non-contact type, capable of writing and reading power and information by the principle of electromagnetic induction, and a waterproof type is preferably used. It may be a contact type connected to the input / output port of the reader / writer 18b. GPS receiver 1 configured as above
When the distance and direction between the point A on the earth and the known point B are measured at 0, the GPS receiver 1 installed at the point A is used.
0, receives GPS signals from a plurality of satellites 12, measures about 2 hours at a predetermined time interval, and stores the obtained information in the memory card 14
To the memory card reader / writer 18 connected to the external computer 16,
4 is attached, and the data (phase and orbital element data, time data) recorded on the memory card 14 is processed using the external computer 16.

At this time, according to the present invention, the memory card 14
The approximate coordinate value of the survey point, the coordinate value of the known point B, the time difference of the survey point, the lower limit altitude of the receivable satellite, the measurement interval,
Communication parameters which initial setting items and other, start and end time of the survey, the reservation setting items such as writing the file name is recorded in advance. In this case, when surveying at multiple surveying points is scheduled, the initial setting items include
What is unique at each survey site, for example, approximate coordinate values of a plurality of survey points, is also recorded in the memory card 14 in advance.

When setting items are recorded on the memory card 14, a memory card reader / writer 18 attached to the external computer 16 is used. In this way, the setting items of the initial setting and the reservation setting are set in advance in the memory card 14.
When the GPS receiver 10 is installed at the surveying point A and the memory card 14 is set in the memory card reader / writer 18b, the information of the memory card 14 is fetched by the instruction of the main CPU 1b, and the measurement start condition is recorded. Is set, and the GPS receiver 10 can be operated according to the setting conditions recorded in the memory card 14.

[0018]

As described above in detail in the embodiments,
According to the operation control method of the GPS receiver according to the present invention,
Since the setting items of the initial setting and the reservation setting are recorded in a memory card in advance, when the memory card is set in the GPS receiver, the conditions for starting the surveying are immediately set, and the surveying can be started without troublesome keyboard operation. Quick surveying is ensured.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a surveying state by a GPS receiver according to the present invention.

FIG. 2 is a block diagram of a GPS receiver according to the present invention.

[Explanation of symbols]

 10a Antenna 10b DPS 11b Main CPU 17b Sub CPU 18b Memory Card Reader / Writer 14 Memory Card

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-175606 (JP, A) JP-A-3-245010 (JP, A) JP-A-2-262005 (JP, A) JP-A-60-1985 93308 (JP, A) JP-A-5-118851 (JP, A) JP-A-6-34738 (JP, A) JP-A-3-73877 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) G01S 5/00-5/14 G01C 11/00

Claims (1)

(57) [Claims] 1. A GPS for receiving radio waves from a plurality of GPS satellites orbiting the earth and recording the phase data and orbital element data contained in the radio waves on a memory card.
In the receiver, the approximate coordinate value of the survey point, the coordinate value of the known point, the time difference of the survey point, the lower limit altitude of the receivable satellite,
Initial setting items including measurement intervals and communication parameters , and
Reserved setting items including the start and end times of the survey and the writing file name are stored in the external computer.
A method for controlling operation of a GPS receiver, wherein the method is preliminarily recorded on the memory card using a memory card reader / writer, and the GPS receiver is operated according to setting conditions recorded on the memory card.