JPH11211808A - Dgps receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DGPS receiving device capable of being connected to an already held GPS(global satellite position measuring system) receiver by normalizing first DGPS information detected from a differential GPS(DGPS) information detecting means based on time information to be converted into second DGPS information. SOLUTION: A FM broadcast receiving part 3 receives FM multiple broadcast radio wave from a FM antenna 2 to be converted into a composite signal. A PLL frequency synthesizer 4 receives oscillating frequency from the FM broadcast receiving part 3, phase-locks it, and supplies it as control voltage to the FM broadcast receiving part 3. A DARC decoder 6 receives the composite signal output by the FM broadcast receiving part 3, decodes a DARC-multiplied signal, and outputs the DGPS information together with time information. A microcontroller 20 normalizes the DGPS information based on the time information, and converts a DARC format to a fixed format held with a GPS receiver 1, and outputs to the GPS receiver 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DGPS receiving apparatus, and more particularly, to receive DGPS information and time information transmitted by radio broadcasting or the like to improve the accuracy of GPS information, and input the information to the GPS receiving apparatus. By doing
The present invention relates to a DGPS receiver from which high-precision GPS information can be obtained. In particular, the present invention relates to a DGPS receiver that can output accurate DGPS information without requiring time information from the GPS receiver.

[0002]

2. Description of the Related Art GPS (Global Position)
n System: a global satellite positioning system), the United States Department of Defense launches multiple satellites in multiple orbits about 20,000 km above the earth, and the GPS emitted by the satellites
It is a system developed for military purposes that allows you to know the location, altitude, and time information of the point where the signal was received. However, since it can also be used for private use, receivers for private use in recent years have been widely used not only in the field of surveying and car navigation, but also worldwide, due to miniaturization and price reductions in recent years.

However, since the system was developed for military purposes, signals that can be used for civilian purposes include S signals.
/ A (Selective Availability)
A deliberate kind of noise called y) is added, and the accuracy is degraded as compared with the use for military purposes.

[0004] In order to obtain more accurate position, altitude and time information even in the case of private use, various methods for improving accuracy have been considered. All of these methods are used in a limited field, and a method in which services have been started for the general public in Japan is DGPS (Di
This is called a differential GPS (Differential GPS). Basically, a ground station having a clear position (latitude and longitude) is provided to receive a GPS signal, and known position information and position information (GPS) determined from the GPS signal. Information), the service company conveys information (DGPS information) using radio communication (currently FM broadcasting), wireless or telephone communication means, and the GPS user uses this information GPS information that is about 10 times higher than the accuracy of GPS is obtained and used.

[0005]

At present, the signal format and communication means of DGPS information provided by each service company are not unified, and the signal format of the GPS receiver is not unified. If you try to use the above DGPS information,
It is necessary to find a DGPS receiver that is compatible with the PS receiver and that is compatible with the signal format and communication means of each service company.

[0006] However, the DGPS information is the GPS information (for example, position information) obtained by the GPS receiver as described above.
Is necessary to correct the time, and accurate time information is required to calculate the correction value.
In general, a DGPS receiving device is integrated into a GPS receiver so as to easily exchange S information and DGPS information.

For this reason, if a GPS user who already has a GPS receiver tries to purchase only a DGPS receiver, there is no function of outputting time information outside the GPS receiver, or the aforementioned communication means. It is extremely difficult to purchase a DGPS receiver that is configured separately and is compatible with the GPS receiver that it owns, because the signal format and the signal format are not unified.
The only option was to purchase a new GPS receiver with a built-in GPS receiver.

[0008] The present invention has been made in view of such a problem, and has been made in consideration of the above problems.
It is intended to provide a GPS receiver.

[0009]

Means for Solving the Problems (1) A first aspect of the present invention for solving the above-mentioned problem is a channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from a plurality of radio broadcast stations, DGPS information detecting means for extracting first DGPS information from the first radio broadcast tuned by the tuning means; and a broadcasting station broadcasting time information by the tuning means; Extracting time information detecting means, and the first DG detected by the DGPS information detecting means.
DGPS information conversion means for converting PS information into second DGPS information based on the time information.

According to the configuration of the present invention, for example, DGPS information transmitted by FM broadcasting can be normalized (returned to original DGPS information including time information) based on time information.

(2) In this case, there is provided time information calibrating means for calibrating the time information based on the time information extracted from the time information detecting means and outputting second time information, and the DGPS information converting means. Is the first DG
The second DGPS is performed based on the PS information based on the second time information.
It is characterized in that it is converted into information.

According to the configuration of the present invention, for example, the time signal (time reference synchronization signal) transmitted by the FM broadcast is calibrated to an accurate time in seconds, and the DGPS information is calibrated based on the calibrated time information. Can be normalized.

(3) Further, the DGPS information converting means includes means for outputting the second DGPS information. According to the configuration of the present invention, for example, FM
DGPS information transmitted by broadcasting can be calibrated based on time information and output to the outside.

(4) A correction means for correcting the DGPS information based on the passage of time and outputting the corrected DGPS information, wherein a time interval at which the first DGPS information is obtained by the DGPS information detection means and When the time interval at which the second DGPS information is output from the output unit is different,
The correction means corrects the second DGPS information in accordance with a time difference from when the first DGPS information is obtained to when the second DGPS information is output.

According to the calibration of the present invention, for example, DGPS information (about once every 5 seconds) obtained by FM broadcast and DG
Since the time (every second) for outputting the PS information is different, the obtained DGPS information can be corrected and output according to the output timing based on the time information.

(5) A second aspect of the present invention for solving the above-mentioned problems is a channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from radio broadcasts of a plurality of radio broadcast stations; The first DGPS from a given radio broadcast
DGPS information detecting means for extracting information, time information detecting means for selecting a broadcasting station broadcasting time information by the channel selecting means, and extracting time information, and the first GPS information detected from the DGPS information detecting means. Converting the DGPS information of the first DGPS information into the second DGPS information based on the time information
Information conversion means, format conversion means for converting the second DGPS information into a predetermined format, and output means for outputting the third DGPS information converted into the predetermined format by the format conversion means Features.

According to the configuration of the present invention, for example, DGPS information transmitted by FM broadcast is normalized based on time information, and a predetermined format (for example, RTCM-SC104 format: hereinafter referred to as SC104) held by the GPS receiver is converted from the DARC format. Format).

(6) In this case, there is provided time information calibrating means for calibrating the time information based on the time information extracted from the time information detecting means and outputting second time information, and the DGPS information converting means is provided. , The first DGP
The S information is converted into second DGPS information based on the second time information.

According to the configuration of the present invention, it is possible to calibrate a time signal transmitted in, for example, an FM broadcast to an accurate time in units of seconds, and to normalize DGPS information based on the time information.

(7) A correction means for correcting the DGPS information based on the passage of time and outputting the corrected DGPS information, wherein a time interval at which the first DGPS information is obtained by the DGPS information detection means and When the time interval at which the third DGPS information is output by the output unit is different, the correction unit determines the time difference from when the first DGPS information is obtained to when the third DGPS information is output. Correspondingly, the second DGPS information is corrected.

According to the configuration of the present invention, for example, DGPS information (once about every 5 seconds) obtained by FM broadcast and DGPS
Since the information output time is different (every second), the obtained DGPS information can be corrected and output according to the output timing based on the time information.

(8) According to a third aspect of the present invention, there is provided a channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from radio broadcasts of a plurality of radio broadcast stations, and selecting the radio broadcast by the channel select means. DGPS information detecting means for extracting DGPS information from the broadcasted radio broadcast, means for determining whether or not the DGPS information detecting means has detected DGPS information, and display for displaying at least whether or not DGPS information has been detected Means for detecting and displaying DGPS information on the display means when the determination means determines that DGPS information has been detected.

According to the configuration of the present invention, when a broadcasting station broadcasting DGPS information is selected, discrimination display for knowing that DGPS information is reliably received is performed in relation to reception sensitivity and the like. Can be.

(9) In this case, the display means is provided with a display unit for indicating the interruption of DGPS information detection, and when the DGPS information has not been detected for a predetermined time after the determination means has determined that DGPS information has been detected, The DGPS information detection interruption display is performed on the display means.

According to the configuration of the present invention, when a broadcasting station broadcasting DGPS information is selected, the discrimination display for knowing that the DGPS information is being continuously received without fail due to the reception sensitivity or the like is displayed. Can do it.

(10) Further, there is provided a receiving sensitivity detecting and displaying means for detecting the receiving sensitivity of the radio broadcasting station selected by the tuning means and displaying at least the presence or absence or the level of the receiving sensitivity as a result of the detection. It is determined whether or not the radio broadcasting station selected by the tuning means is broadcasting DGPS information based on a combined display of the DGPS information detection display of the means and the presence or absence of the reception sensitivity of the reception sensitivity detection display means or the height display. It is characterized by being able to do it.

According to the configuration of the present invention, it is possible to discriminate and display whether the selected radio broadcast station is transmitting DGPS information or the DGPS information cannot be detected due to poor reception sensitivity.

(11) An output means for outputting the second DGPS information is provided. According to the configuration of the present invention, the second DGPS information (for example, DA
RC) can be output to the outside.

(12) An output signal switching means for outputting either the second DGPS information or the third DGPS information is provided. According to the configuration of the present invention, the second DGPS information (for example, DARC)
Any of the third DGPS information (for example, SC104 format signal) can be selected and output.

(13) A fourth aspect of the present invention for solving the above-mentioned problem is that, in the radio broadcasting channel selecting device, at least radio broadcasting of at least any radio broadcasting station is automatically selected from radio broadcasting of a plurality of radio broadcasting stations. A tuning unit having an auto search mode capable of detecting the tuning mode; a tuning mode detecting unit for detecting a tuning mode of the tuning unit; and a current limiting unit for limiting current according to the tuning mode. The current limiter amplifies the circuit current when the mode detector detects the auto search mode.

According to the configuration of the present invention, power can be supplied to the circuit only in the auto search mode to extend the life of the battery. (14) A fifth aspect of the present invention for solving the above-mentioned problems is a device for displaying the reception sensitivity of a radio broadcast, wherein a radio broadcast channel selecting means and a noise level of a frequency selected by the channel selecting means are detected. A noise level detection unit, a display unit for displaying reception sensitivity, and a display control unit for controlling a display state of the display unit according to a noise level of the noise level detection unit; It is characterized in that the noise level of the area is detected and the reception sensitivity is displayed according to the magnitude of the noise level.

According to the configuration of the present invention, it is possible to detect a noise level in a predetermined frequency region of a selected radio broadcast station and display the reception sensitivity according to the magnitude of the noise level.

(15) A sixth aspect of the present invention for solving the above-mentioned problems is a radio broadcast receiving apparatus, comprising: a receiving means for receiving a radio broadcast; and a telescopic, expanding, or folding means so that the receiving means can receive the radio broadcast. Possible antenna means, power supply means for supplying power to the receiving means, antenna detecting means for detecting a change in expansion, contraction, extension or folding of the antenna means, and responding to a change in the antenna detected by the antenna detecting means. Control means for controlling the power supply means.The antenna detection means detects that the reception means has changed the reception means to receive a radio broadcast, and the control means supplies the power supply means. The power supply of the means is controlled.

According to the structure of the present invention, it is possible to extend the life of the battery by detecting that the antenna has been extended, turning on the power of the receiving device, and turning off the power of the receiving device when the antenna is returned to its original position. Can be.

[0035]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a GPS which receives a radio wave from a satellite, receives its position information (latitude and longitude) and time information, and outputs position information and time information.
It is a receiver.

Reference numeral 3 denotes an FM broadcast receiving unit that receives an FM multiplex broadcast wave from the FM antenna 2 and converts it into a composite signal. The contents of the composite signal are an audio signal, a stereo signal, a DARC signal, and a noise component. The FM broadcast receiving unit 3 is configured by a known technique called a normal FM tuner. The FM broadcast receiving section 3 amplifies a received signal, an RF amplifier 3a, a mixer (MIX) 3b receiving an output of the RF amplifier 3a, an IF amplifier 3c receiving an output of the mixture 3b, and receiving an output of the IF amplifier 3c. It comprises an FM detection circuit 3d.

Reference numeral 4 denotes a PLL frequency synthesizer for causing the FM broadcast receiving unit 3 to function as a synthesizer tuner. The PLL frequency synthesizer 4 receives the transmission frequency from the FM broadcast receiving unit 3 and uses the frequency-locked signal as a control voltage to control the FM broadcast receiving unit 3.
Give to. Reference numeral 5 denotes an amplifier that receives an S-meter (signal meter) output from the FM broadcast receiving unit 3, receives a noise component included in the composite signal as a control signal, and outputs a predetermined output.

Reference numeral 6 denotes a DARC decoder that receives and decodes a composite signal output from the FM broadcast receiving unit 3. FM multiplex broadcasting is a signal that multiplexes and transmits teletext information using a vacant frequency region in addition to a normal audio signal, and is called DARC multiplexing. In order to decode the DARC-multiplexed signal, a DARC decoder is used. The DARC decoder 6 outputs time information and DGPS information.

Reference numeral 20 denotes a microcontroller for controlling the operation of the entire apparatus. As the microcontroller 20, for example, a CPU of about 8 bits is used. The microcontroller 20 provides a control signal to the PLL frequency synthesizer 4 and receives tuning frequency data. Further, the output of the S meter amplifier 5 is received. Further, it supplies a control signal to the DARC decoder 6 and receives time information and DGPS information from the DARC decoder 6.

Reference numeral 7 denotes a battery for supplying power to the circuit. Reference numeral 8 denotes a constant voltage circuit that converts a voltage of 9V into a voltage of 5V. This 5 V voltage is partially applied directly to the microcontroller 20 and partially applied via the switch SW1. This is provided to prevent battery consumption when unnecessary.

SW2 is a switch for increasing the frequency when manually setting the tuning frequency.
Is a switch for lowering the frequency, and SW4 is a switch for storing the manually set frequency in the memory.

Reference numeral 30 denotes a display for displaying necessary information, for example, an LCD (liquid crystal) is used. The contents displayed on the display 30 are the battery monitor, the contents of the memory, the S meter output, the DGPS information, and the reception frequency. The microcontroller 20 includes the DARC decoder 6
Of the RTCM-SC 104 to the GPS receiver 1
A DGPS correction signal is provided in a format.

The microcontroller 20 obtains the following information. That is, DARC format, PRC, RRC
A signal, an accuracy correction signal, an SC104 format, and a communication format. The communication format is a format for dividing the SC104 format into a plurality of units and transmitting the divided units. Here, PRC is a pseudo distance correction value for correcting the position information obtained by the GPS receiver, and RRC is a pseudo distance change rate correction value. Reference numeral 21 denotes an internal clock of the microcontroller 20.

FIG. 2 is a diagram showing an example of an external configuration of a system using the present invention, and shows an example of a photographic image recording system. In the figure, 41 is a camera body, 42 is a GPS unit, 43 is a control unit, and 100 is a DGPS receiver according to the present invention. The control unit 43 obtains the latitude and longitude information of the shooting location and the time information based on the information obtained from the GPS unit 42, but corrects the obtained information with a correction signal given from the DGPS receiver. Thus, more accurate position information can be obtained.
The operation of the device configured as described above will be described below.

An FM multiplex broadcast wave is detected by the FM antenna 2. The detected FM multiplex radio wave is received by the FM broadcast receiving unit 3 and output as a composite signal. The technology from the reception of the radio wave by the FM antenna 2 to the output of the composite signal is an existing technology. Here, the composite signal includes an audio signal, a stereo signal, a DARC signal, and a noise component. When the noise component increases due to jamming radio waves (for example, ignition noise), D
Since it becomes impossible to read the ARC signal, it is desirable to display the status.

Here, the amplifier 5 obtains an S-meter output from the signal detected by the FM broadcast receiving unit 3 using a noise component as a level control signal. The obtained level signal is displayed on the S-meter display section of the display 30.

The composite signal enters the subsequent DARC decoder 6 and the DARC-multiplexed DGPS signal is decoded. Here, when a control signal is given from the microcontroller 20, the DARC decoder 6 gives time information and DGPS information to the microcontroller 20.

FIG. 3 is a diagram showing a configuration example of DGPS information. The DGPS information is a signal of 34 bits in total. The first bit has a scale factor, the next 2 to 3 bits have a UDRE (User Differential Distance Error Index), and the next 4 to 8 bits have for each GPS satellite. ID, next 9 bits to 19 bits are PRC (pseudo distance correction value), next 20 bits to 26 bits are RRC
(Pseudo-distance change rate correction value), and the following 27 bits to 34 bits are an IODE (ephemeris data issue number).

FIG. 4 is a diagram showing the contents of the scale factor. When the scale factor is "0", PRC, RR
The LSB and dynamic range of C become small, and when the scale factor is “1”, the LSB and dynamic range of PRC and RRC become large. By the way, the unit of the PRC and RRC transmitted by FM is different from the unit of the SC104 format input to the GPS unit receiver 1. The microcontroller 20 performs this unit conversion. In addition, the microcontroller 20
Upon receiving the time information from the ARC decoder 6, the internal clock 2
1 is generated. The internal clock operates on its own after being generated after the power is turned on.

When UDRE is 2 or 3, DGP of FM
Since the accuracy of the S information is insufficient, it is necessary to perform further correction processing. On the other hand, the DARC decoder 6 sends time information at the reference time, and PRC information and RRC information at that time. The PRC information and the RRC information are, for example, 5
It is sent about once a second, and the GPS unit 1
Not every second needed. Therefore, the microcontroller 20 needs to create a time signal every other second based on the received reference time and calculate the RRC signal by calculation. The DGPS information (PRC, RRC) at a certain time is only SC1
04 format and sends it to the GPS unit 1. When creating such information, the microcontroller 20 obtains second time information (in units of one second) from the transmitted reference time information, and converts the position error information for each second time information into SC104 format. And output.

FIG. 6 is a diagram showing the configuration of the SC104 format, showing the first two words. One word is 30 bits. These two words are a header common to all types. First word message type 6
The bits and the 13 bits of Z count (time information) in the second word are important. The information after three words is information for each satellite.

According to this embodiment, for example, the time is corrected to an accurate time in seconds based on the time signal (time reference synchronization signal) transmitted by FM broadcasting, and the DGPS is calibrated based on the calibrated time information. The information can be normalized.

At this time, the DGPS receiving apparatus 100 can output the DGPS information normalized by the calibrated time information, for example, from a connector or the like. Therefore, according to this embodiment, for example, DGPS information sent by FM broadcasting can be calibrated based on time information and output to the outside.

The microcontroller 20 converts the time information sent, for example, about once every 5 seconds into DGPS information every second. For this purpose, the received reference data is converted into a PRC every second. Figure 5 shows P in seconds
It is explanatory drawing of RC characteristic calculation. The vertical axis is the error, the horizontal axis is the time t, and f1 is the RRC characteristic curve. The error at time t = 0 is the PRC (pseudo distance correction value). Here, assuming that the DGPS information is transmitted at time t1, for example, the period from the time t1 when the next DGPS information is transmitted must be converted into a PRC every second (second time information). There is.

Then, based on the RRC at the time t1, the value of the PRC at one-second intervals is calculated therefrom. The calculation method is the time t
The slope of the characteristic curve f1 is obtained based on the error RRC at 1 and the PRC at 1 second, 2 seconds, 3 seconds, and 4 seconds thereafter.
Is calculated. As a result, for example, GPS information sent only once every 5 seconds can be converted to GPS information in seconds. Thus, the SC104 format is created.

According to this embodiment, for example, the DGPS information obtained by FM broadcasting and the time for outputting the DGPS information are different, so that the DGPS information obtained at the reference time is adjusted to the output timing based on the time information. The output can be corrected.

The microcontroller 20 can convert the DGPS information normalized (calibrated) based on the second time information thus obtained into the SC104 format and output it. Specifically, SC10
4 formats are output in a predetermined unit. GP
The S receiver 1 can correct the latitude and longitude information based on the DGPS information sent in one-second units, and can obtain more accurate position information (latitude and longitude).

According to this embodiment, for example, DGPS information transmitted by FM broadcasting is normalized based on time information, and converted from a DARC format to a predetermined format (for example, SC104 format) held by a GPS receiver. Can be output.

According to the present invention, the microcontroller 2
0 determines whether the device has detected DGPS information,
A display indicating whether or not DGPS information has been detected can be performed. FIG. 7 is a diagram showing a part of the display on the display. Reference numeral 50 denotes a battery indicator, 51 denotes an S-meter display, 52 denotes a reception frequency, and * in 53 denotes whether or not DGPS information is reliably detected. This display example shows that Tokyo FM (frequency 80.0 MHz) is being received.

According to this embodiment, when a broadcasting station which broadcasts DGPS information is selected, discrimination display for knowing that DGPS information is being reliably received is performed due to reception sensitivity and the like. be able to.

In this case, if the DGPS information cannot be reliably detected, the DGPS information detection interruption display can be performed on the display. According to this embodiment, when a broadcasting station broadcasting DGPS information is selected, discrimination display for knowing that reception of DGPS information is surely continued due to reception sensitivity and the like is performed. Can be. An asterisk mark * is not displayed in the upper part of FIG. 6, indicating that DGPS information has not been reliably received.

Further, according to the present invention, it is possible to display presence / absence or high / low of the reception sensitivity on the display. FIG. 8 is an explanatory diagram of the display of the reception sensitivity level. The display of the height of the S meter 51 allows the user to grasp the reception sensitivity by observing the state of the reception sensitivity. The figure shows a state where the uppermost stage has a sufficient reception sensitivity, and then a state where the sensitivity decreases as going down. The bottom row shows the case where there is no reception sensitivity.

According to this embodiment, it is possible to determine and display whether the selected radio broadcast station is transmitting DGPS information or whether the reception sensitivity is poor and DGPS information cannot be detected.

FIG. 9 is an explanatory diagram of a battery display monitor. Reference numeral 50 denotes a battery display unit. When the voltage of the battery decreases, the display on the battery display unit becomes thinner as shown in the figure, and can be indicated to the user.

According to the present invention, it is possible to provide output means for outputting the second DGPS information (DARC decoder output) to the outside. According to this embodiment, the second DGPS information can be output to the outside.

According to the present invention, the second DGPS information and the third DGPS information (SC104 format)
Can be switched by a switch and output to the outside.

According to this embodiment, the second DGP
Either S information (DARC decoder output) or third DGPS information (SC104 format signal) can be selected and output by a switch.

Further, according to the present invention, it is possible to provide an auto search mode in which an arbitrary radio broadcast station can be automatically selected as the selection means. In auto search mode,
For example, the radio frequency is checked in units of 100 kHz. If it is detected that this selecting means is operating in the auto search mode, F
Power is supplied to the IF frequency detector of the M tuner.

According to this embodiment, the life of the battery 7 can be extended by supplying power to the circuit only in the auto search mode. Further, according to the present invention, when displaying the reception sensitivity of a radio broadcast, the reception sensitivity can be displayed in accordance with the noise level detected by the noise level detection means and in accordance with the magnitude of the noise level ( See FIG. 8).

According to this embodiment, it is possible to detect a noise level in a predetermined frequency region of a selected radio broadcast station, and display the reception sensitivity according to the magnitude of the noise level.

In the system using the present invention, the FM antenna 2 is provided for receiving the FM broadcast (see FIGS. 1 and 2). A means for detecting a change in expansion, contraction, extension, or folding of the antenna 2 is provided. When the antenna is receiving FM broadcast, power is supplied to the circuit. When the antenna is not receiving FM broadcast, Power can not be supplied to the circuit.

According to this embodiment, the extension of the antenna 2 is detected, the power of the receiving device is turned on, and when the antenna is returned to the original position, the power of the receiving device is turned off. Can be extended.

FIG. 10 is an explanatory diagram of the effect of the present invention. The vertical axis is the east longitude error, and the horizontal axis is the north latitude error (unit: m). ◆ in the figure indicates the measurement error of the conventional GPS unit,
Δ indicates a measurement error according to the present invention. As is clear from the figure, the error when only the conventional GPS unit is used is 40 m.
Compared to about 60 m, in the case of the device of the present invention, it can be seen that it is within 10 m.

Next, the detailed operation of the function of each unit of the present invention will be described with reference to a flowchart. FIG. 11 is a flowchart showing the initialization operation. The main part of the operation is the microcontroller 20. First, when the battery is replaced (S1), first initialization is performed (S2). Next, the state of the power on / off switch is detected (S3). Then, it is checked whether the power switch is on (S4). If it is off, the stop mode is started (S5).

If the switch is on, a second initialization is performed (S6). The contents of the second initialization are baud rate setting, LCD setting, FM reception start, and DARC reception start. Next, a runaway of the circuit is detected (S7).
Next, key input processing (details described later) is performed (S8), and tuning processing (details described later) is performed (S9). next,
Periodic processing (details described later) is performed at 300 ms intervals (S1
0).

Next, the time of the internal clock of the main body is set (S11). Next, DARC reading control is performed (S
12). Next, DARC data processing (decoding processing)
Is performed (S13). Next, test mode processing for checking circuit operation is performed (S14), DGPS signal output processing is performed (S15), and LCD display processing is performed (S15). Upon completion of the above processing, the flow returns to step S7 to perform the runaway detection processing. Hereinafter, the same processing is repeated.

During the above processing, interrupts such as a DARC frame interrupt, a DARC block interrupt, and a CCB interrupt are inserted. When an interrupt occurs, the interrupt processing is performed, and then the operation returns to the original operation.

FIGS. 12 and 13 are flowcharts showing the key input processing operation. First, microcontroller 2
0 checks whether the search up / down key has been pressed (S1). If it is pressed, it is checked whether or not the automatic tuning is being performed (S2). If the automatic tuning is being performed, the automatic tuning is canceled (S3), and DARC reception of the corresponding frequency is started (S4).

If auto tuning is not being performed, D
The ARC reception is stopped, the output of the SC104 format is stopped, a new frequency is set by the tuning button, and a key continuous pressing timer is set (S5). Next, it is checked whether the search up / down has been released (S
6). If released, it is checked whether quick tuning is being performed (S7), and if so, the process proceeds to auto tuning (S8). If quick tuning is not in progress, DA
The reception of RC is started (S9).

Next, it is checked whether or not the memory key SW4 for storing the tuned frequency is released (S10). If the key is released, it is checked whether or not the key is a push (S11). If so, the memory call processing, the updating of the memory number, and the updating of the LCD display are performed (S12).

Next, it is checked whether the reception frequency has been changed (S13). If changed, DARC
The reception and SC104 output are stopped, a new frequency is set, and DARC reception is started (S14). Next, it is checked whether the memory key SW4 has been pressed (S1).
5). If the key is pressed, a key continuous pressing timer is set (S16). The set value of the key continuous pressing timer is set, for example, to about 2 seconds. Next, it is checked whether the key is continuously pressed (S17). If so, it is checked whether it is the memory key SW4 (S18). If so, the memory save process is performed, the reception frequency is saved, and the display on the LCD is updated (S20). . If it is not a memory key, the process proceeds to quick tuning (S19).

FIG. 14 is a flowchart showing the tuning processing operation. In this case, the determination of the IF count value and the stop condition are the following two types. Judgment based on the appropriate range obtained in the state of normal electric field or more
First, the auto-tuning process will be described.
First, it is checked whether the tuning interval has elapsed (S1). If the tuning interval has elapsed, it is checked whether an SD signal has been detected (S
2). If no SD signal is detected, the next frequency is set (S5), and a tuning interval is set (S6). When the SD signal is detected, the IF count value is determined (S3), and it is checked whether the value is within the range of the stop condition (S4). If not, the process proceeds to step S5. If it is within the range, the auto tuning is ended (S7), and DARC reception is started (S8).

Next, the quick tuning process will be described. First, it is checked whether the tuning interval has elapsed (S1), and if so, the next frequency is set (S2), and the tuning interval is set (S11).

FIG. 15 is a flowchart showing the CCB interface interrupt operation. The CCB interface is a control method in which a plurality of I / Os can be controlled by one serial interface. Since the serial interface is interrupted both at the time of transmission and at the time of reception, it is necessary to perform processing while distinguishing between sending a control code or data and receiving data from an I / O.

First, it is checked whether or not a CCB interrupt occurs when a control code is transmitted (S1). If so, it is checked whether it is data input from the PLL (S2). If so, it is saved as PLL status data (S3).

When the data is not input from the PLL,
Check whether time data is being acquired (S
4). If so, it is checked whether it is additional information data input (S5), and if not, it is checked whether it is additional information preamble (S6),
If so, an instruction to read the additional information data is issued (S7). If the input is additional information data in step S5, it is saved as date and time information (S8).

In step S4, if time data is not being acquired, it is checked whether DGPS data is being input (S9). If not, it is checked whether it is a DGPS preamble (S10). If there is, an instruction to read DGPS data is issued (S11). If the DGPS data is being input in step S9, the DGPS data is saved for 40 bytes (S12).

FIG. 16 is a flowchart showing the DARC data processing operation. Tier 4 for the entered data
(S1). Then, it is checked whether there is a CRC error (S2). If there is no CRC error, the data is copied to buffer group A (a group for copying all the received data).
Then, the data is rearranged in units of 34 bits, and N
The UL data is detected, and the number of received data is counted (S3).

Next, it is checked whether or not there is received data (S4). If there is actual data, the data is copied to buffer group B (a group for copying only meaningful data). Then, unit conversion to the SC 104 is performed, and ephemeris confirmation and processing are performed (S5).

FIG. 17 is a flowchart showing the DGPS signal processing operation. It is checked whether one second has elapsed since the DGPS data was transmitted by RS232C (S
1). If one second has elapsed, it is checked whether there is no reception for 30 seconds or more (S2). Otherwise, prepare to output DGPS data (SC104 group A
To). Then, the format conversion to the SC 104 is performed, the interpolation calculation of the output data, the insertion of the fill data, the check of the health status of the reference station are performed, the header of the SC 104 is created, and the parity data for the SC 104 is created (S3). Next, the RS232C (serial interface) is activated. Then, the DGPS data is converted to RS232 data.
The format is converted to the C format, and the RS232C is started (S4).

FIG. 18 is a flowchart showing a 300 ms periodical processing operation. First, the lighting state of the DGPS indicator is checked (S1). When lit,
Check whether DGPS output is possible (S
2). If output is possible, an asterisk is lit (S4; see FIG. 7). Next, A / D conversion input is performed, the battery voltage is read, and the S meter is read (S5). When the DGPS output is disabled, the asterisk blinks (S3).

According to the present invention, DGP from FM multiplex broadcasting
Since the S information and the time information are obtained, it is not necessary to equip the DGPS receiver with a new GPS receiver only for obtaining the time information. In addition, after performing necessary calculations, the DG required for correcting the GPS positioning error in a predetermined format.
Since it can be output as PS information, it can be easily connected to an existing GPS receiving device that has a DGPS input terminal and is compatible with the input format, and can improve the positioning accuracy.

Further, since a GPS receiver is not required, the circuit configuration of the present DGPS receiver and control of transmission and reception of signals with the GPS receiver are simplified, and as a result, the DGPS receiver can be manufactured at low cost. it can.

Further, it is possible to provide a DGPS receiving apparatus that can be connected to any existing GPS receiver having a DGPS input terminal only by changing the output format of the DGPS receiving apparatus. In addition, existing GPS
Since it is easy to integrate the receiver and the DGPS receiving device integrally in the case, in productization, a product configuration according to the use of an integrated type or a separated type is possible in a plurality of forms.

In the above embodiment, the D according to the present invention is
The case where the output of the GPS receiver is given to the GPS unit of the camera has been described as an example, but the present invention is not limited to this. The present invention can be applied to all types of devices using GPS information.

[0096]

As described above in detail, (1) According to the first invention, a channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from radio broadcasts of a plurality of radio broadcast stations. DGPS information detecting means for extracting first DGPS information from the first radio broadcast selected by the tuning means, and a broadcasting station which is broadcasting time information by the tuning means; Time information detecting means for extracting the data, and the first information detected by the DGPS information detecting means.
Of the second DGPS based on the time information.
By providing DGPS information conversion means for converting the information into DGP information, for example, DGPS information transmitted by FM broadcast is normalized based on time information (original DGP information including time information).
S information).

(2) In this case, there is provided time information calibrating means for calibrating the time information based on the time information extracted from the time information detecting means and outputting second time information, and the DGPS information converting means is provided. Is the first DG
The second DGPS is performed based on the PS information based on the second time information.
By converting the information into information, for example, a time signal (time reference synchronization signal) transmitted by FM broadcasting is calibrated to an accurate time in seconds, and the DG is corrected based on the calibrated time information.
The PS information can be normalized.

(3) Further, the DGPS information conversion means includes means for outputting the second DGPS information, so that the DGPS information transmitted by, for example, FM broadcasting is calibrated based on time information and output to the outside. can do.

(4) There is also provided a correcting means for correcting the DGPS information based on the passage of time and outputting the corrected DGPS information. The time interval at which the first DGPS information is obtained by the DGPS information detecting means and When the time interval at which the second DGPS information is output from the output unit is different,
The correction means corrects the second DGPS information in accordance with a time difference from when the first DGPS information is obtained to when the second DGPS information is output, so that, for example, FM broadcast DGPS information (about 5
(Approximately once per second) and the time (every second) for outputting the DGPS information, the obtained DGPS information can be corrected and output according to the output timing based on the time information.

(5) According to the second invention, a channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from a plurality of radio broadcast stations, and a predetermined channel selected by the channel select means. To extract the first DGPS information from the radio broadcast of D
GPS information detection means, time information detection means for selecting a broadcasting station broadcasting time information by the channel selection means and extracting time information, and the first DGPS information detected by the DGPS information detection means DGPS information converting means for converting the time information into second DGPS information based on the time information;
By providing format conversion means for converting the second DGPS information into a predetermined format, and output means for outputting the third DGPS information converted into the predetermined format by the format conversion means, for example, F
The DGPS information transmitted in the M broadcast can be normalized based on the time information, converted from the DARC format to a predetermined format (for example, SC104 format) held by the GPS receiver, and output.

(6) In this case, there is provided time information calibrating means for calibrating the time information based on the time information extracted from the time information detecting means and outputting second time information, and the DGPS information converting means is provided. , The first DGP
By converting the S information to the second DGPS information based on the second time information, for example, the time signal sent by the FM broadcast is corrected to an accurate time in seconds, and the DGPS information is converted based on the time information. Can be normalized.

(7) There is also provided a correction means for correcting the DGPS information based on the passage of time and outputting the corrected DGPS information. The time interval at which the first DGPS information is obtained by the DGPS information detection means and When the time interval at which the third DGPS information is output by the output unit is different, the correction unit determines the time difference from when the first DGPS information is obtained to when the third DGPS information is output. By correspondingly correcting the second DGPS information, for example, the DGPS information (once about once every 5 seconds) obtained by FM broadcasting and the time (1
(Every second), the obtained DGPS information can be corrected and output in accordance with the output timing based on the time information.

(8) According to the third invention, a channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from a plurality of radio broadcast stations, and a radio station selected by the channel selecting means. DGPS information detecting means for extracting DGPS information from a broadcast; means for determining whether the DGPS information detecting means has detected DGPS information; and display means for displaying at least whether or not DGPS information has been detected. When the discriminating means determines that DGPS information has been detected, by displaying DGPS information on the display means, a broadcasting station broadcasting DGPS information is selected. The discrimination display for knowing that the information is received reliably can be performed.

(9) In this case, the display means is provided with a display unit for indicating the interruption of DGPS information detection, and when the DGPS information has not been detected for a predetermined time after the determination means has determined that DGPS information has been detected, By displaying the DGPS information detection interruption display on the display means,
When a broadcasting station broadcasting PS information is selected, discrimination display can be performed to know that DGPS information is being received reliably due to reception sensitivity and the like.

(10) Further, there is provided a receiving sensitivity detecting and displaying means for detecting the receiving sensitivity of the radio broadcasting station selected by the tuning means and displaying at least the presence or absence or the level of the receiving sensitivity as a result of the detection. It is determined whether or not the radio broadcasting station selected by the tuning means is broadcasting DGPS information based on a combined display of the DGPS information detection display of the means and the presence or absence of the reception sensitivity of the reception sensitivity detection display means or the height display. By making it possible, it is possible to determine and display whether the selected radio broadcast station is transmitting DGPS information or whether the reception sensitivity is poor and the DGPS information cannot be detected.

(11) Since the output means for outputting the second DGPS information is provided, the second DGPS information is provided.
Information (for example, DARC) can be output to the outside.

(12) Since output signal switching means for outputting either the second DGPS information or the third DGPS information is provided, the second DGPS information (for example, DARC) and the third DGPS information are output. DGPS information (for example, SC10
4 format signal) can be selected and output.

(13) According to the fourth aspect of the present invention, in the radio broadcast channel selecting apparatus, an auto search mode in which at least a radio broadcast of any radio broadcast station can be automatically selected from a plurality of radio broadcast stations. Tuning means comprising: a tuning mode detecting means for detecting a tuning mode of the tuning means; and a current limiting means for limiting a current in accordance with the tuning mode. The current limiting means amplifies the circuit current when it is detected that the mode is the auto search mode, so that power is supplied to the circuit only in the auto search mode, thereby extending the life of the battery. .

(14) According to the fifth aspect, in the apparatus for displaying the reception sensitivity of a radio broadcast, a radio broadcast channel selecting means, and a noise detecting a noise level of a frequency selected by the channel selecting means. A predetermined frequency region of a selected radio broadcast, comprising: level detection means, display means for displaying reception sensitivity, and display control means for controlling a display state of the display means according to the noise level of the noise level detection means. Detects the noise level of the selected radio broadcast station by detecting the noise level of the selected radio broadcast station, and displays the reception sensitivity according to the noise level. Can be displayed.

(15) According to the sixth aspect, in the radio broadcast receiving apparatus, receiving means for receiving a radio broadcast,
Antenna means capable of expanding, contracting, expanding or folding so that the receiving means can receive a radio broadcast; power supply means for supplying power to the receiving means; and detecting a change in expansion, contraction, extension or folding of the antenna means. Antenna detecting means, and control means for controlling the power supply means in accordance with a change in the antenna detected by the antenna detecting means, wherein the antenna detecting means receives the radio broadcast from the antenna means The control means controls the power supply of the power supply means by detecting that the antenna has been extended, thereby detecting that the antenna has been extended, turning on the power of the receiving apparatus, and returning the antenna to the original state. When the receiver is turned off, the battery life can be extended.

As described above, according to the present invention, it is possible to provide a DGPS receiving apparatus which can be connected to a GPS receiver already possessed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of an external configuration of a system using the present invention.

FIG. 3 is a diagram illustrating a configuration example of DGPS information.

FIG. 4 is a diagram showing the contents of a scale factor.

FIG. 5 is an explanatory diagram of PRC characteristic calculation in seconds.

FIG. 6 is a diagram showing a configuration of an SC104 format.

FIG. 7 is a diagram showing a part of a display on a display.

FIG. 8 is an explanatory diagram of a display of a reception sensitivity level.

FIG. 9 is an explanatory diagram of a display on a battery display monitor.

FIG. 10 is an explanatory diagram of an effect according to the present invention.

FIG. 11 is a flowchart showing an initialization operation of the present invention.

FIG. 12 is a flowchart illustrating a key input processing operation.

FIG. 13 is a flowchart showing a key input processing operation.

FIG. 14 is a flowchart showing a tuning processing operation.

FIG. 15 is a flowchart showing a CCB interface interrupt operation.

FIG. 16 is a flowchart showing a DARC data processing operation.

FIG. 17 is a flowchart showing a DGPS signal processing operation.

FIG. 18 is a flowchart illustrating a 300 ms regular processing operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 GPS receiver 2 FM antenna 3 FM broadcast receiving part 4 PLL frequency synthesizer 5 Amplifier 6 DARC decoder 7 Battery (dry battery) 8 Constant voltage circuit 20 Microcontroller 21 Internal clock 30 Display SW1 switch SW2 switch SW3 switch SW4 switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04H 1/00 H04H 1/00 P (72) Inventor Katsushi Miyagi 10-6-1, Kawabe-cho, Ome-shi, Tokyo Tomi Tower 702 Ad Fox Inside the corporation

Claims (15)

[Claims] 1. A channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from radio broadcasts of a plurality of radio broadcast stations, and a first radio broadcast selected by the channel select means from a first radio broadcast.
DGPS information detecting means for extracting the DGPS information of the above, a broadcasting station which is broadcasting time information by the tuning means, a time information detecting means for extracting the time information, and the DGPS information detected from the DGPS information detecting means The first D
A DGPS receiving apparatus comprising: DGPS information conversion means for converting GPS information into second DGPS information based on the time information. 2. A time information calibrating means for calibrating the time information based on the time information extracted from the time information detecting means and outputting second time information, wherein the DGPS information converting means comprises 2. The DGPS receiving apparatus according to claim 1, wherein the DGPS information is converted into second DGPS information based on the second time information. 3. The DGPS information conversion means according to claim 2, wherein:
The DGPS receiving apparatus according to claim 1, further comprising a unit that outputs GPS information. And a correction unit for correcting the DGPS information based on the passage of time and outputting the corrected DGPS information, wherein a time interval at which the first DGPS information is obtained by the DGPS information detection unit and the output unit are provided. Second DGP
When the time intervals at which the S information is output are different, the correction means may determine the second DGPS information in correspondence with a time difference from when the first DGPS information is obtained to when the second DGPS information is output. 4. The DGPS according to claim 1, wherein the DGPS information is corrected.
Receiver. 5. A channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from radio broadcasts of a plurality of radio broadcast stations, and a first radio broadcast from a predetermined radio broadcast selected by the channel select means.
DGPS information detecting means for extracting the DGPS information of the above, a broadcasting station which is broadcasting time information by the tuning means, a time information detecting means for extracting the time information, and the DGPS information detected from the DGPS information detecting means The first D
DGPS information conversion means for converting GPS information into second DGPS information based on the time information, format conversion means for converting the second DGPS information into a predetermined format, conversion into a predetermined format by the format conversion means Output means for outputting the obtained third DGPS information. 6. A time information calibrating means for calibrating the time information based on the time information taken out from the time information detecting means and outputting second time information, wherein the DGPS information converting means comprises: The DGPS receiving apparatus according to claim 5, wherein the DGPS information is converted into second DGPS information based on the second time information. 7. A method for correcting DGPS information based on a lapse of time and outputting corrected DGPS information, comprising: a time interval at which the first DGPS information is obtained by the DGPS information detecting means; Third DG
When the time interval at which the PS information is output is different, the correction means may determine the second DPS information corresponding to a time difference from when the first DGPS information is obtained to when the third DGPS information is output. 7. The DGPS according to claim 5, wherein the DGPS information is corrected.
Receiver. 8. A channel selecting means for selecting a radio broadcast of an arbitrary radio broadcast station from radio broadcasts of a plurality of radio broadcast stations, and DGPS information detection for extracting DGPS information from the radio broadcast selected by the channel selecting means. Means for determining whether the DGPS information detection means has detected DGPS information, and display means for displaying at least whether or not DGPS information has been detected, wherein the determination means detects the DGPS information. A DGPS information detection display on the display means when it is determined that the DGPS information is received. 9. A display unit for indicating that DGPS information detection has been interrupted is provided in said display means, and when the DGPS information has not been detected for a predetermined time after the determination means has determined that DGPS information has been detected, the display means displays 9. The DGPS according to claim 8, wherein the DGPS information detection interruption display is performed.
Receiver. 10. A reception sensitivity detecting and displaying means for detecting the receiving sensitivity of a radio station selected by said tuning means and displaying at least the presence or absence or the level of the receiving sensitivity as a result of the detection. The combination of the information detection display and the presence / absence or high / low display of the reception sensitivity of the reception sensitivity detection display means makes it possible to determine whether the radio broadcasting station selected by the channel selection means is broadcasting DGPS information. The DGPS receiving apparatus according to claim 8, wherein: 11. The DGP according to claim 8, further comprising an output unit for outputting the second DGPS information.
S receiver. 12. The second DGPS information and a third DG
9. The DGPS receiver according to claim 8, further comprising output signal switching means for outputting any one of the PS information. 13. An apparatus for selecting a radio broadcast, comprising: an auto search mode for automatically selecting at least a radio broadcast of any radio broadcast station from a plurality of radio broadcast stations; A tuning mode detecting means for detecting a tuning mode of the tuning means, and a current limiting means for limiting a current in accordance with the tuning mode, wherein the tuning mode detecting means detects an auto search mode. Wherein the current limiting means amplifies a circuit current. 14. An apparatus for displaying the reception sensitivity of a radio broadcast, comprising: means for selecting a radio broadcast; noise level detection means for detecting a noise level of a frequency selected by the channel selection means; And display control means for controlling a display state of the display means in accordance with the noise level of the noise level detection means, wherein a noise level in a predetermined frequency region of the selected radio broadcast is detected, and the noise level is detected. A DGPS receiving apparatus for displaying reception sensitivity in accordance with the size of the DGPS. 15. A radio broadcast receiving apparatus, comprising: receiving means for receiving a radio broadcast; antenna means capable of expanding, contracting, or folding so that the receiving means can receive the radio broadcast; and supplying power to the receiving means. Power supply means for detecting a change in the expansion, contraction, extension or folding of the antenna means, and control means for controlling the power supply means in accordance with a change in the antenna detected by the antenna detection means. DGPS wherein the antenna detecting means detects that the receiving means has changed the receiving means to receive the radio broadcast, and the control means controls the power supply of the power supply means. Receiver.