JP2009250618A - Satellite signal receiving system, and noise removal method of satellite signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a satellite signal receiving system capable of removing more properly a noise included in a received satellite signal. <P>SOLUTION: A navigation device 12 transmits an initial setting signal to a GPS receiving device 1, and then transmits a discrimination signal of a peripheral apparatus 13 functioning as a noise source, and the receiving device 1 analyzes a received signal by a frequency analyzer 15, allows an oscillator 17 to output an oscillation signal having an analyzed frequency and power intensity, adjusts a phase by a phase shifter 6, synthesizes it with a noise received by an element 2, and allows a memory 18 to store a phase whose signal level output from the frequency analyzer 15 becomes the lowest, together with the frequency and the signal intensity. When the discrimination signal of the peripheral apparatus 13 functioning as the noise source is transmitted thereafter, the receiving device 1 reads out the frequency, the power intensity and phase information stored in the memory 18, sets the oscillator 17 and the phase shifter 6, and synthesizes the oscillation signal with the received signal, and the navigation device 12 performs A/D conversion of a signal given from the receiving device 1, and removes a noise by a digital filter part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a system for receiving a satellite signal via a satellite signal receiving device and a method for removing noise from the satellite signal in order for the vehicle navigation device to perform positioning.

When a vehicle navigation device receives a GPS (Global Positioning System) signal for positioning, an element on the GPS receiver side is used to compensate for a decrease in signal level due to a loss generated by a coaxial cable in the transmission path. The received satellite signal is amplified and transmitted to the navigation device side.
Since various electronic devices such as a car audio device and a car air conditioner are arranged in the passenger compartment where the navigation device is arranged, the elements of the GPS receiving device also generate noise when they operate. Reception is unavoidable, which is a cause of degradation of positioning performance. Therefore, it is necessary to perform processing for removing unnecessary noise included in the received signal.

For example, Patent Document 1 discloses a reference noise signal that outputs a reference noise signal Nr correlated with mixed noise N received by a GPS receiving antenna unit after A / D converting the received signal in order to solve the above-described problem. An output unit is provided to generate an anti-noise signal AN that cancels the mixed noise N based on the reference noise signal Nr. A GPS receiver provided with a noise removing unit that reduces N ″) is disclosed.
JP 2001-4736 A

  However, in Patent Document 1, since noise is removed by digital processing after A / D conversion of the received signal, noise mixed in the analog signal is also A / D converted as it is. Here, noise generated by an electronic device generally has a sharp peak at a specific frequency, such as a harmonic of a system clock signal. When A / D conversion is performed on a received signal including such noise, the frequency component of the noise tends to spread slightly (see FIG. 6), causing interference with the GPS signal. Therefore, even if noise removal by digital processing is performed from that state, noise may not be sufficiently removed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a satellite signal receiving system and a satellite signal noise removing method that can more appropriately remove noise contained in a received satellite signal. is there.

  According to the satellite signal receiving system of claim 1, when the vehicle navigation device transmits an initial setting signal to the satellite signal receiving device, the electronic device disposed in the vehicle interior causes noise relative to the band of the satellite signal. An identification signal indicating that the source is currently operating is transmitted, and when the initial setting signal is given, the receiving apparatus analyzes the received signal by frequency analysis means, and the oscillation signal of the analyzed frequency and signal strength Is set to output to the oscillation signal output means. The phase of the oscillation signal is adjusted by the phase shifter and synthesized with the received signal, and the frequency and signal analyzed by the frequency analysis means are analyzed when the level of the signal output by the frequency analysis means is minimum. It memorize | stores in a memory | storage means with intensity | strength. “Signal strength” means the power level or amplitude level of a signal.

  When the navigation device transmits the initial setting end signal, the receiving device switches the first and second switch circuits to the first signal synthesizing means side, and thereafter the electronic device that is a noise source is operating. When the identification signal is transmitted, the frequency, signal strength, and phase information stored in the storage means is read based on the identification signal, the oscillation signal output means and the phaser are set, and the oscillation signal output from the phaser is received. Composite to signal. When the navigation device performs A / D conversion on the signal given from the receiving device, the navigation device performs digital filtering to remove noise.

  With this configuration, the satellite signal receiving device outputs the oscillation signal output means and the phase shifter based on the result of analyzing the noise generated by the electronic equipment disposed in the vehicle interior in the initial setting by the frequency analysis means. Noise can be removed in the analog domain by the oscillation signal. On the navigation device side, the signal from which the noise has been removed on the satellite signal receiving device side is further subjected to digital filtering to remove the noise. Therefore, even when there is room for noise to be mixed while signals are transmitted from the receiving device to the navigation device, noise can be removed by digital processing, so that it is possible to prevent deterioration in positioning accuracy based on satellite signals.

  According to the satellite signal receiving system according to claim 2, when a plurality of electronic devices serving as noise sources are arranged in the vehicle interior, the control unit of the receiving device is analyzed by the frequency analyzing unit among the plurality of electronic devices. The signal having the maximum signal intensity at the frequency is set in the oscillation signal output means and the phase shifter after completion of the initial setting. That is, even when only one set of the oscillation signal output means and the phase shifter can be prepared on the receiving device side, the influence of the noise can be reduced by setting so as to remove the noise having the greatest influence.

  According to the satellite signal receiving system of claim 3, when the satellite signal receiving device includes a plurality of sets of oscillation signal output means and phase shifters, and a plurality of electronic devices serving as noise sources are arranged in the vehicle interior, the control is performed. The means sets a plurality of frequencies analyzed by the frequency analysis means in the initial setting to a set of a plurality of oscillation signal output means and a phase shifter. That is, when a plurality of sets of oscillation signal output means and phase shifters are prepared on the receiving device side, each noise can be removed by setting them together with a plurality of noise sources.

  According to the satellite signal receiving system according to claim 4, the control signal output means of the navigation device transmits the control signal as a frequency signal, and the control means of the receiving device uses the frequency of the control signal analyzed by the frequency analysis means. The control signal is identified. That is, since the control signal can be identified using the frequency analysis means provided in the receiving device, it is not necessary to separately prepare a circuit for identifying the signal, and the receiving device can be downsized.

  According to the satellite signal receiving system of claim 5, when the navigation device is configured to supply the operating power to the receiving device, the control signal output means superimposes the frequency signal on the operating power. The receiving device separates the operation power supply and the frequency signal from the superimposed signal transmitted from the navigation device by the signal separation means, supplies the operation power supply to each part, and also transmits the frequency signal to the frequency analysis means. Output to. Accordingly, it is not necessary to separately prepare a signal line for transmitting a control signal from the navigation device to the receiving device.

  According to the satellite signal receiving system of the sixth aspect, the navigation device and the receiving device are connected by the coaxial cable, and the power supply for operation on which the frequency signal is superimposed is transmitted. That is, the receiving device and the navigation device are often connected by a coaxial cable to transmit a received signal as described above. Therefore, if the operation power supply and the frequency signal are transmitted from the navigation device to the receiving device using the coaxial cable, it is not necessary to prepare a separate signal line.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a functional block diagram showing the configuration of the satellite signal receiving system with a focus on the satellite signal receiving device side. When receiving the GPS signal by the GPS element 2 (satellite signal receiving means), the GPS receiver 1 receives the received signal through the switch circuit 3 (demultiplexer, SW1, first switch circuit) and synthesizers 4 and 5 (respectively). The output can be selected in circles 1 and 2 in the figure. The synthesizer 4 (first signal synthesizing means) is on the reception path side (ordinary reception system) used during normal operation, and receives a reception signal given through the switch circuit 3 and a phaser 6 described later. Addition and synthesis with the given oscillation signal.

  When the output signal (RF signal) of the synthesizer 4 is amplified by the amplifier 7, it is given to the directional coupler 9 via the band pass filter (BPF) 8. The directional coupler 9 transmits the given RF signal to the vehicle navigation device 12 via the DC / RF distributor 10 (signal separation means) through the coaxial cable 11. The navigation device 12 is connected with other electronic devices arranged in the vehicle interior, for example, an AV device including a car stereo or an in-vehicle TV, a car air conditioner, and the like as the peripheral device 13, and ON / OFF information thereof. Is to be given.

  The navigation device 12 supplies operation power to the GPS receiver 1 via the coaxial cable 11 and transmits an RF band frequency signal (referred to as an RF control signal) superimposed on the power supply as a control signal. It is supposed to be. When they are separated into a DC power source and an RF control signal by the DC / RF distributor 10, the power source is supplied to each part of the GPS receiver 1, and the RF control signal is synthesized via the directional coupler 9. Is output to the device 5.

  The synthesizer 5 (second signal synthesizing means) is arranged in a signal path used at the time of initial setting described later, and one side of the output terminal of the switch circuit 3 and the other switch circuit 14 (SW2, second). One side of the output terminal of the switch circuit) is connected. The output terminal of the phase shifter 6 described above is connected to the input terminal of the switch circuit 14, and the combiner 5 adds and combines the received signal of the GPS element 2 and the oscillation signal given via the phase shifter 6. To do. The synthesized signal is output to the frequency analyzer 15 (frequency analysis means). The RF control signal output from the navigation device 12 side is directly output to the frequency analyzer 15 via the synthesizer 5.

  The control circuit 16 (control means) is constituted by a microcomputer, and the frequency analyzer 15 is a function realized by software of the control circuit 16. The control circuit 16 refers to the analysis result of the frequency analyzer 15, controls the phase shifter 6, the switch circuits 3 and 14, and the oscillator 17 (oscillation signal output means), and controls the memory 18 (storage means). Read and write data. The oscillator 17 is composed of, for example, an NCO (Numerically Controlled Oscillator), generates an oscillation signal having a frequency and a signal intensity corresponding to a control command given from the control circuit 16, and outputs the oscillation signal to the phase shifter 6. When the phase shifter 6 shifts the phase of the given oscillation signal in accordance with the control command given from the control circuit 16, the phase shifter 6 outputs it to the switch circuit 14.

  FIG. 2 is a functional block diagram showing the configuration on the navigation device 12 side with respect to the portion according to the gist of the present invention. The front end unit 21 of the navigation device 12 converts the analog RF signal given from the GPS receiver 1 into an intermediate frequency band by mixing with an intermediate frequency (IF) signal generated based on the reference clock by the mixer 22. The output signal of the mixer 22 is output to the digital filter unit 24 (digital filter means) via the low pass filter 23.

In the digital filter unit 24, when the IF signal is A / D converted, the digital signal is subjected to low-pass or band-pass filtering processing by digital calculation and is output to the baseband unit 25. In the baseband unit 25, the data corresponding to the oscillation signal of the estimated carrier frequency generated by the NCO 26 is multiplied by the output data of the digital filter unit 24 by the multiplier 27, and the carrier component is removed. Here, orthogonal demodulation may be performed by outputting data corresponding to the I and Q signals whose phases are different from each other by 90 degrees from the NCO 26.
The multiplication result data of the multiplier 27 is output to the next-stage multiplier 28 and is multiplied by the GPS code (pseudo noise signal) output from the GPS code generator 29. Then, the multiplication result data of the multiplier 28 is demodulated.

  The control circuit 30 (control signal output means) is composed of a microcomputer and controls the navigation device 12 in an integrated manner. As described above, ON / OFF information of each peripheral device 13 is given to the control circuit 30, and the control circuit 30 controls the oscillator 31 (control signal output means) in accordance with the initial setting program and the ON / OFF information. Then, oscillation signals having different frequencies are output as RF control signals. The RF control signal is transmitted to the GPS receiver 1 via the coaxial cable 11 when superimposed on the DC power supplied from the power circuit 33 in the DC / RF combiner 32 (control signal output means).

  FIG. 3 is a flowchart showing the contents of the initial setting process executed by the control circuit 30 of the navigation device 12 and the control circuit 16 of the GPS receiver 1. The initial setting process is performed at a stage before the GPS receiver 1 and the navigation device 12 are mounted on the vehicle together with the peripheral device 13 and shipped. In that case, the vehicle is placed in an environment where GPS signals transmitted from GPS satellites can be shielded. Moreover, since the thing which radiates | emits the noise which affects the signal band of GPS among several peripheral devices 13 can be specified in advance, they are made into the object of noise removal.

When the control circuit 30 of the navigation device 12 starts up in the initial setting mode, the control circuit 30 sets a frequency in the oscillator 31 and transmits a signal indicating the start of the initial setting to the GPS receiving device 1 side (step S1). The frequency of the signal is set to a frequency outside the GPS signal band (1575.42 MHz ± 1.023 MHz), such as 1300 MHz, for example.
Subsequently, a signal for identifying the peripheral device 13 in the operating state at that time is transmitted as an RF control signal (step S2). The identification signal is assigned a frequency such as 1400 MHz when the TV tuner is ON and 1420 MHz when the air conditioner is ON. In this case, a signal that the operator operates each power switch is given to the control circuit 30 as ON / OFF information.

  On the GPS receiver 1 side, the RF control signals transmitted in steps S1 and S2 are applied to the frequency analyzer 15 via the synthesizer 5, and their frequencies are detected and output to the control circuit 16 (steps). S3). Then, the control circuit 16 recognizes that the initial setting process has been started, and switches the switch circuits 3 and 14 to select the synthesizer 5 side (step S4). As a result, noise radiated from the operating peripheral device 13 is received by the GPS element 2 and output to the frequency analyzer 15 via the switch circuit 3 and the synthesizer 5.

  Next, the control circuit 16 gives a peak noise search command to the frequency analyzer 15 (step S5), and the frequency analyzer 15 detects the frequency and power intensity of the peak noise for the GPS signal band, and transmits it to the control circuit 16. (Step S6). The control circuit 16 sets the frequency and power intensity of the peak noise in the oscillator 17 (step S7), outputs the corresponding oscillation signal, and causes the phase shifter 6 to change the phase of the oscillation signal output from the oscillator 17. A command is given to (step S8).

  Then, the phase shifter 6 changes the phase of the oscillation signal in the range of 0 degrees to 180 degrees, and the combiner 5 receives the noise received by the GPS element 2 and the oscillation signal output from the phase shifter 6. Therefore, the combined signal of both is given to the frequency analyzer 15. The control circuit 16 requests the frequency analyzer 15 for the power intensity of the peak noise detected in step S6 (step S9), and determines the phase difference that minimizes the power intensity (usually in reverse phase). S10). When the phase difference is determined, the peak noise frequency, power intensity, and phase difference, and identification information of the corresponding peripheral device 13 are written and stored in the memory 18 as noise removal signal information (step S11).

  Next, the control circuit 30 on the navigation device 12 side determines whether there is another peripheral device 13 that becomes a noise source (step S12). If there is (YES), the process returns to step S2, and the peripheral device 13 is determined. The identification signal is transmitted and the same detection is performed. On the other hand, if there is no other peripheral device 13 serving as a noise source (NO), an initial setting end signal (for example, frequency 1310 MHz) is transmitted to the GPS receiver 1 side (step S13). Then, the control circuit 16 recognizes the end signal and switches the switch circuits 3 and 14 to the synthesizer 4 side.

FIG. 4 is a flowchart showing the processing contents when the initial setting is completed as described above and the shipped vehicle normally operates in the field. The control circuit 30 waits until the peripheral device 13 that becomes a noise source starts operation by the operation of the vehicle occupant (step S21). When the noise source starts operation (YES), the control circuit 30 is the same as step S2. A signal for identifying the peripheral device 13 is transmitted to (step S22).
Then, the control circuit 16 on the GPS receiver 1 side receives the identification signal, and reads the noise removal signal information corresponding to the identification signal from the memory 16 (step S23). In addition, when there are a plurality of peripheral devices 13 serving as noise sources, the device having the maximum power intensity is selected and read out. Then, the read information is set in the oscillator 16 and the phase shifter 6, and the synthesizer 4 outputs a noise removal signal (step S24).

  Here, FIG. 5 shows an image in which noise is removed by the above-described action in a frequency spectrum. FIG. 5A shows a state in which the GPS signal (broken line) received by the GPS element 2 and noise (dashed line) radiated from the peripheral device 13 in the vehicle interior are superimposed (solid line). b) is an image of a noise removal signal generated according to the noise. Actually, the noise removal signal has a phase opposite to that of the noise (a). FIG. 5C shows an image obtained by synthesizing the noise (a) and the noise removal signal (b). The noise is removed and only the GPS signal component remains.

  As described above, the GPS signal from which noise has been removed in the analog region on the GPS receiver 1 side is transmitted to the navigation device 12 side, and further filtered in the digital filter unit 24 via the front end unit 21. Output to the baseband unit 25.

Reference is again made to FIG. After execution of step S24, the control circuit 30 of the navigation device 12 stands by until there is a change in the operating state of the peripheral device 13 that is a noise source (step S25). When the operation state changes (YES), it is determined whether or not all the operations of the peripheral device 13 that is a noise source are turned off (step S26). A control signal for stopping the operation of the oscillator 17 is output to the apparatus 1 side, and the control circuit 16 stops the operation of the oscillator 17 (step S27). Then, the process proceeds to step S21.
On the other hand, in step S26, when the ON / OFF state of the peripheral device 13 is switched (any one or more are ON) or there are peripheral devices 13 that are additionally turned ON, the process proceeds to step S2, and these are performed. The identification information corresponding to ON / OFF of is transmitted to the GPS receiver 1 side.

  As described above, according to the present embodiment, the vehicle navigation device 12 transmits a signal indicating the start of the initial setting to the GPS receiver 1, and the peripheral device 13 in the passenger compartment is currently operating as a noise source. When receiving the initial setting signal, the receiving apparatus 1 analyzes the received signal by the frequency analyzer 15 and transmits the oscillation signal of the analyzed frequency and power intensity (signal intensity) to the oscillator. 17 to output. Further, the phase of the oscillation signal is adjusted by the phase shifter 6 and synthesized with the noise received by the GPS element 2, and the phase when the level of the signal output by the frequency analyzer 15 becomes the lowest is expressed by the frequency analyzer. 15 is stored in the memory 18 together with the frequency and the signal intensity analyzed by 15.

  When the navigation device 12 transmits an initial setting end signal, the receiving device 1 switches the switch circuits 3 and 14 to the synthesizer 4 side. Thereafter, when an identification signal indicating that the peripheral device 13 serving as a noise source is operating is transmitted, the frequency, signal intensity, and phase information stored in the memory 18 is read according to the identification signal, and the oscillator 17 is read. In addition, the phase shifter 6 is set, the oscillation signal output from the phase shifter 6 is combined with the received signal, and the navigation device 12 performs A / D conversion on the signal supplied from the receiving device 1 and performs a filtering process by the digital filter unit 24. And remove the noise.

  Therefore, on the GPS receiver 1 side, noise is generated in the analog region by the oscillation signal output from the oscillator 17 and the phase shifter 6 based on the analysis result of the noise generated by the peripheral device 13 in the initial setting by the frequency analyzer 15. Can be removed. On the navigation device 12 side, the signal from which noise has been removed on the GPS receiving device 1 side is further subjected to digital filtering processing to remove the noise, so that noise is transmitted while the signal is transmitted from the receiving device 1 to the navigation device 12. Even when there is room for mixing, noise can be removed by digital processing, and degradation of positioning accuracy based on GPS signals can be prevented.

In addition, when a plurality of peripheral devices 13 serving as noise sources are arranged, the control circuit 16 of the receiving device 1 ends the initial setting of the one having the maximum power intensity at the frequency analyzed by the frequency analyzer 15. Thereafter, the oscillator 17 and the phase shifter 6 are set. Therefore, even when only one set of the oscillator 17 and the phase shifter can be prepared on the receiving device 1 side, it can be dealt with by setting so as to remove the noise having the greatest influence.
The navigation device 12 transmits the control signal as a frequency signal, and the control circuit 16 of the receiving device 1 identifies the signal based on the frequency of the RF control signal analyzed by the frequency analyzer 15. Thus, it is possible to identify the control signal, and it is not necessary to separately prepare a circuit for identifying the signal, and the receiving apparatus 1 can be downsized.

  When the navigation device 12 supplies DC power to the receiving device 1, the DC / RF combiner 32 superimposes and transmits an RF control signal on the DC power, and the receiving device 1 The DC power source and the RF control signal are separated by the DC / RF distributor 10, the operation power source is supplied to each unit, and the RF control signal is output to the frequency analyzer 15. Therefore, it is not necessary to separately prepare a signal line for transmitting a control signal from the navigation device 12 to the receiving device 1.

  In addition, the navigation device 12 and the receiving device 1 are connected by the coaxial cable 11, and the DC power source on which the RF control signal is superimposed is transmitted. That is, since the receiving device 1 and the navigation device 12 are often connected by the coaxial cable 11 to transmit the received signal, the DC power source and the RF control signal can be transmitted using the coaxial cable 11. In this case, it is not necessary to prepare a separate signal line.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications or expansions are possible.
When the GPS receiver 1 is provided with a plurality of sets of the oscillator 17 and the phase shifter 6 and a plurality of peripheral devices 13 serving as noise sources are arranged, the control circuit 16 has a plurality of components analyzed by the frequency analyzer 15 in the initial setting. May be set for each of the plurality of oscillators 17 and the phase shifter 6 after completion of the initial setting. If constituted in this way, each noise can be removed.

When DC power is supplied to the GPS receiver 1 from the navigation device 12 side, it is not always necessary to superimpose the RF control signal on the DC power source, and both may be transmitted independently. Further, it is not always necessary to supply DC power to the GPS receiver 1 from the navigation device 12 side.
The control signal is not limited to being transmitted as a frequency signal, but may be transmitted in the form of a level signal, a phase signal, a data command, or the like.
The satellite signal receiving apparatus is not limited to the one corresponding to the GPS satellite, but may be configured corresponding to the Galileo satellite, the Glonus satellite, or the like.

1 is a functional block diagram showing a configuration of a satellite signal receiving system centering on a satellite signal receiving device side according to an embodiment of the present invention. Functional block diagram showing the configuration of the navigation device with respect to the part according to the gist of the present invention Flow chart showing contents of initial setting process Flow chart showing the contents of normal processing Diagram showing the image from which noise is removed in the frequency spectrum This is an image of the prior art, and shows a change in frequency spectrum when a satellite signal mixed with noise is A / D converted.

Explanation of symbols

  In the drawings, 1 is a GPS receiver (satellite signal receiver), 2 is a GPS element (satellite signal receiver), 3 is a switch circuit (first switch circuit), and 4 and 5 are synthesizers (first and second signals). Synthesis means), 6 a phase shifter, 10 a DC / RF distributor (signal separation means), 11 a coaxial cable, 12 a vehicle navigation device, 13 a peripheral device (electronic device), and 14 a switch circuit (second 15 is a frequency analyzer (frequency analysis means), 16 is a control circuit (control means), 17 is an oscillator (oscillation signal output means), 18 is a memory (storage means), and 24 is a digital filter section (digital filter). Means), 30 is a control circuit (control signal output means), 31 is an oscillator (control signal output means), and 32 is a DC / RF combiner (control signal output means).

Claims (12)

Satellite signal receiving means for receiving satellite signals;
Frequency analyzing means for analyzing the frequency of the signal received by the satellite signal receiving means;
An oscillation signal output means configured to control the oscillation frequency and to output an oscillation signal having a set frequency at a set signal strength;
A phase shifter for adjusting the phase of the oscillation signal;
First signal synthesizing means for synthesizing the signal received by the satellite signal receiving means and the signal output from the phase shifter and outputting the synthesized signal to a normal receiving system;
Second signal synthesizing means for synthesizing the signal received by the satellite signal receiving means and the output signal of the phase shifter and outputting the synthesized signal to the frequency analyzing means;
A first switch circuit that switches the signal received by the satellite signal receiving means to output to either the first signal synthesizing means or the second signal synthesizing means;
A second switch circuit that switches the output signal of the phase shifter to output to either the first signal synthesis unit or the second signal synthesis unit;
A satellite signal receiving apparatus configured to control an oscillation frequency of the oscillation signal output means and to control switching of the first and second switch circuits;
A signal output via the first signal synthesizing means of this satellite signal receiving device is given,
Digital filter means for A / D converting the signal to perform digital filter processing;
A vehicle navigation device comprising control signal output means for outputting a control signal to the control means,
When the control signal output means transmits an initial setting signal to the control means, an electronic device arranged in a vehicle interior that is a noise source for the band of the satellite signal is currently operating. Send an identification signal indicating
When the initial setting signal is given, the control means switches the first and second switch circuits to the second signal synthesizing means side, and the oscillation signal having the frequency and signal intensity analyzed by the frequency analysis means is sent to the control means. The oscillation signal output means is set to output, and the phase of the oscillation signal is adjusted by the phase shifter, and the phase when the level of the signal output by the frequency analysis means becomes the minimum is determined by the frequency analysis. Memorize in the memory means together with the frequency and signal strength analyzed by the means,
When an initial setting end signal is transmitted by the control signal output means, the first and second switch circuits are switched to the first signal synthesis means side,
When the control signal of the satellite signal receiving apparatus transmits an identification signal indicating that the electronic device as the noise source is operating from the control signal output means, the control signal is stored in the storage means based on the identification signal. A satellite signal receiving system comprising: reading out the frequency, signal intensity and phase information, setting the oscillation signal output means and the phase shifter, and causing the first signal synthesis means to output a signal. When a plurality of electronic devices that are noise sources for the band of the satellite signal are arranged in the vehicle interior,
The control means sets, in the oscillation signal output means and the phase shifter, after the initial setting, the one having the maximum signal intensity at the frequency analyzed by the frequency analysis means among the electronic devices. The satellite signal receiving system according to claim 1. The satellite signal receiving device includes a plurality of sets of the oscillation signal output means and the phase shifter,
When a plurality of electronic devices that are noise sources for the band of the satellite signal are arranged in the vehicle interior,
In the initial setting, the control means sets the plurality of frequencies analyzed by the frequency analysis means to the set of the plurality of oscillation signal output means and the phase shifter after completion of the initial setting, respectively. The satellite signal receiving system according to claim 1. The control signal output means of the vehicle navigation device transmits a control signal output to the control means of the satellite signal receiving device as a frequency signal,
4. The satellite signal receiving system according to claim 1, wherein the control means identifies the control signal based on the frequency of the control signal analyzed by the frequency analysis means. The vehicle navigation device is configured to supply operation power to the satellite signal reception device, and the control signal output means transmits the frequency signal superimposed on the operation power supply,
The satellite signal receiving device includes signal separation means for separating the operation power supply and the frequency signal from the superimposed signal transmitted from the vehicle navigation device,
5. The satellite signal receiving system according to claim 4, wherein the signal separating unit supplies the operation power supply to each unit and outputs the frequency signal to the frequency analyzing unit. The vehicle navigation device and the satellite signal receiving device are connected by a coaxial cable,
6. The satellite signal receiving system according to claim 5, wherein the vehicle navigation device transmits an operation power source on which the frequency signal is superimposed via the coaxial cable. In the satellite signal noise removing method for removing noise contained in the received signal when the vehicle navigation device uses the satellite signal received by the satellite signal receiving device for positioning,
When the vehicle navigation device transmits an initial setting signal to the satellite signal receiving device, an electronic device arranged in a passenger compartment is currently operating as a noise source for the band of the satellite signal. An identification signal indicating that
The receiving device is:
When the initial setting signal is given, the received signal is analyzed by the frequency analysis means, and the oscillation signal having the analyzed frequency and signal strength is set to be output to the oscillation signal output means, and the phase of the oscillation signal is set by the phase shifter. Is adjusted and combined with the received signal,
The phase when the level of the signal output by the frequency analysis means becomes the lowest is stored in the storage means together with the frequency and signal intensity analyzed by the frequency analysis means,
When the navigation device transmits an identification signal indicating that the electronic device that is the noise source is operating, the frequency, signal strength, and phase information stored in the storage means is read based on the identification signal, and the oscillation signal Set the output means and the phase shifter, synthesize the oscillation signal output from the phase shifter with the received signal,
A satellite signal noise removing method, wherein the navigation device performs digital filtering processing to remove noise when the signal supplied from the receiving device is A / D converted. When a plurality of electronic devices that are noise sources for the band of the satellite signal are arranged in the vehicle interior,
8. The receiving apparatus, wherein the electronic device having the maximum signal intensity at the frequency analyzed by the frequency analysis unit is set in the oscillation signal output unit and the phase shifter. The method for removing noise from the satellite signal as described. When a plurality of electronic devices that are noise sources for the band of the satellite signal are arranged in the vehicle interior,
The receiver comprises a plurality of sets of the oscillation signal output means and the phase shifter,
8. The receiver according to claim 7, wherein, in the initial setting, the plurality of frequencies analyzed by the frequency analyzing unit are respectively set to the plurality of oscillation signal output units and the set of the phase shifters. A method for removing noise from satellite signals. The navigation device transmits a control signal to be output to the receiving device as a frequency signal,
The satellite signal noise removal method according to claim 7, wherein the receiving apparatus identifies the control signal based on the frequency of the control signal analyzed by the frequency analysis unit. When the navigation device is configured to supply operating power to the receiving device,
The navigation device transmits the frequency signal superimposed on the power supply for operation,
11. The satellite signal according to claim 10, wherein the receiving device separates the operation power source and the frequency signal from the superimposed signal transmitted from the navigation device, and supplies the operation power source to each unit. Noise removal method. The navigation device and the receiving device are connected by a coaxial cable,
12. The satellite signal noise removal method according to claim 11, wherein the navigation device transmits an operation power source on which the frequency signal is superimposed via the coaxial cable.

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