JP2013009161A - Receiver and navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiver in which an appropriate receiving parameter can be set based on a geographical condition even in an area visited for the first time, and a navigation device provided with the same.SOLUTION: The receiver includes a receiving unit 3 for receiving a radio wave from a broadcasting station; a position information detection unit 4 for detecting the position of its own vehicle; a position information analysis unit 51 for analyzing the geographical condition of the position of the own vehicle detected by the position information detection unit 4; a data storage unit 53 for storing correction information corresponding to the receiving parameter that determines receiving characteristics of the receiving unit 3; a receiving parameter calculation unit 52 that reads out the correction information corresponding to the geographical condition obtained by the analysis of the position information analysis unit 51 from the data storage unit 53, and calculates the receiving parameter corresponding to the geographical condition by using the correction information; and a receiving parameter setting unit 32 for setting the receiving parameter calculated by the receiving parameter calculation unit 52 to the receiving unit.

Description

  The present invention relates to a receiver mounted on a moving body such as a vehicle and a navigation apparatus including the receiver.

Conventionally, reception parameters related to reception characteristics of a receiver are often set to a predetermined value. For example, the reception parameters of the automatic sound quality control (ATC) circuit and the automatic separation control (ASC) circuit are fixed to predetermined values that are appropriate on average. For this reason, when the geographical conditions change with the movement of the vehicle and the radio wave environment changes accordingly, the reception parameters set in advance may not be able to cope with it, and good reception may not be possible.
For the above-described problem, in the in-vehicle receiving device disclosed in Patent Document 1, parameters for setting reception characteristics suitable for each region are stored in a memory in advance for each of the ATC circuit and the ASC circuit, and the current position of the vehicle The reception characteristics of the receiver are changed by appropriately reading out the parameters of the area including the receiver.

Japanese Patent Laid-Open No. 2004-241907

  In the conventional technique represented by Patent Document 1, there is a problem that when the vehicle travels outside the area where the reception parameter is obtained in advance, appropriate reception parameters cannot be set in the ATC circuit and the ASC circuit.

  The present invention has been made to solve the above-described problems, and a receiver capable of setting appropriate reception parameters based on the geographical conditions even in the first region, and a navigation apparatus including the receiver. The purpose is to obtain.

  A receiver according to the present invention includes a receiver that receives or receives a radio wave from a broadcasting station, a position information detector that detects a position of the mobile object, and a position information detector in a receiver that is mounted or held on the mobile object. An analysis unit that analyzes the geographical condition of the position of the detected moving body, a storage unit that stores correction information corresponding to the geographical condition of the reception parameter that determines the reception characteristics of the reception unit, and an analysis by the analysis unit The correction information corresponding to the geographical condition is read from the storage unit, the calculation unit that calculates the reception parameter corresponding to the geographical condition using the correction information, and the reception parameter calculated by the calculation unit to the reception unit A setting unit for setting.

  According to the present invention, it is possible to set appropriate reception parameters based on the geographical conditions even in the first area.

It is a block diagram which shows the structure of the navigation apparatus carrying the receiver concerning Embodiment 1 of this invention. 6 is a flowchart showing a flow of reception parameter setting processing by the receiver according to the first embodiment.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a navigation device equipped with a receiver according to Embodiment 1 of the present invention. In FIG. 1, the navigation device according to Embodiment 1 is a navigation device mounted on a moving body such as a vehicle, and includes a receiver 1 and a navigation device unit 2. The receiver 1 is a receiver according to Embodiment 1, and includes a receiver 3, a position information detector 4, and a reception parameter controller 5. In addition, the navigation device unit 2 is configured to perform navigation processing that shares the position information detection unit 4 with the receiver 1, and includes a navigation processing unit 21 and a map database (DB) 22.

The navigation processing unit 21 uses the position information of the vehicle (own vehicle) on which the own device is detected detected by the position information detection unit 4, the input information of the destination, and the map data of the map DB 22 to search for a route, guide the route, It is a processing unit that performs navigation processing such as map display.
The map DB 22 is a database that stores map data used for navigation processing and reception parameter setting. The map data includes topographic map data, house map data, road network, and the like.

The receiving unit 3 is a receiving unit that receives a broadcast wave transmitted from a broadcasting station, and includes a reception demodulating unit 31 and a reception parameter setting unit 32.
The reception demodulation unit 31 is a functional configuration unit that demodulates a broadcast wave signal received by an antenna.
The reception parameter setting unit 32 is a setting unit that sets reception parameters for determining the reception characteristics of the reception unit 3 in the reception unit 3 including the reception demodulation unit 31.
The reception parameters are parameters that determine the reception characteristics of the reception unit 3, and include RF (high frequency) gain coefficients, filter coefficients of adaptive filters that suppress multipath fading, filter coefficients of IF (intermediate frequency) band filters, The ratio of the high blend, the filter coefficient of the high cut filter, the filter coefficient of the audio filter, how to apply soft mute, the strength of the noise canceller, the AGC (automatic gain control) time constant, and the like.

  The position information detection unit 4 is a position information detection unit that detects the position information of the own vehicle. For example, the position information detection unit 4 detects the position information (latitude and longitude) of the own vehicle from the analysis result of GPS radio waves received from a GPS (Global Positioning System) satellite. To do.

  The reception parameter control unit 5 is a control unit that calculates a reception parameter corresponding to the geographical condition of the area where the host vehicle is located and sets the reception parameter in the receiver 1, and includes a position information analysis unit 51, a reception parameter calculation unit 52, and A data storage unit 53 is provided.

The position information analysis unit 51 is an analysis unit that analyzes the geographical condition of the area where the vehicle is located using the position information of the vehicle detected by the position information detection unit 4 and the map data of the map DB 22.
For example, the distance from the own vehicle position to the broadcasting station, the direction of the broadcasting station based on the traveling direction of the own vehicle, and the transmission power of the broadcasting station are obtained.
In addition, when the vehicle is traveling near or between mountains from the map data, the distance from the vehicle position to the mountain, the direction of the mountain based on the traveling direction of the vehicle, the vehicle, the broadcasting station, the mountain, Is obtained as a geographical condition.
Further, it is determined from the map data whether the vehicle is traveling in the city area or the suburbs, and the density of the building is obtained as a geographical condition.

  The reception parameter control unit 5 uses the geographical condition of the region where the vehicle is located analyzed by the position information analysis unit 51 and the correction information of the reception parameter for each geographical condition stored in the data storage unit 53. It is a calculation part which calculates the value of the reception parameter which matched the geographical conditions of the area where a car is located.

The data storage unit 53 is a storage unit that stores table data indicating reception parameter correction information for each geographical condition. The reception parameter correction information is information indicating a tendency of the reception parameter that gives an appropriate reception characteristic under a predetermined geographical condition.
For example, in the RF gain coefficient correction information corresponding to the geographical condition “distance from the vehicle position to the broadcasting station”, if the distance from the vehicle position to the broadcasting station is larger than a predetermined threshold, the RF gain coefficient It is specified that the value is corrected so as to increase, and if the value is equal to or less than the threshold value, the RF gain coefficient is corrected so as to decrease.
The correction information of the filter coefficient of the adaptive filter that suppresses multipath fading corresponding to the geographical conditions “the density of buildings around the vehicle” and “the relative positional relationship between the vehicle, the broadcasting station, and the mountain” For example, when the influence of multipath fading is strong, correction is made so that the filter coefficient of the adaptive filter that suppresses this is increased, and when it is weak, correction is made so that the filter coefficient of the adaptive filter is reduced.
Similarly, IF band filter filter coefficient, high blend ratio, high cut filter filter coefficient, audio filter filter coefficient, soft muting method, noise canceller strength, and AGC are associated with predetermined geographical conditions. Constant correction information is set in advance.

Next, the operation will be described.
FIG. 2 is a flowchart showing a flow of reception parameter setting processing by the receiver according to the first embodiment.
First, the position information detection unit 4 detects the position information of the own vehicle for each preset travel distance (step ST1). Next, the location information analysis unit 51 analyzes the geographical condition in the area where the vehicle is located, using the location information of the vehicle detected by the location information detection unit 4 and the map data of the map DB 22. Here, the position information analysis unit 51 analyzes the area where the host vehicle is located according to the condition content set in advance as the geographical condition as described above.

  Subsequently, the reception parameter calculation unit 52 uses the geographical condition of the region where the vehicle is located analyzed by the position information analysis unit 51 and the correction information of the reception parameter for each geographical condition stored in the data storage unit 53. Thus, the value of the reception parameter that matches the geographical condition of the area where the vehicle is located is calculated (step ST2). That is, the reception parameter calculation unit 52 acquires correction information of the reception parameter corresponding to the geographical condition from the data storage unit 53 based on the geographical condition of the region where the vehicle is located, which is obtained by the position information analysis unit 51. Then, the reception parameter value currently set in the receiving unit 3 is corrected, and the reception parameter that matches the geographical condition of the area where the vehicle is located is calculated.

Next, the reception parameter setting unit 32 determines whether or not the difference between the reception parameter calculated by the reception parameter calculation unit 52 and the current reception parameter in the reception unit 3 has changed by a predetermined threshold or more (step ST3). .
For example, the differences between the RF gain coefficient, IF band filter coefficient, high blend ratio, high cut filter coefficient, audio filter coefficient, noise canceller strength, and AGC time constant after correction are compared. In addition, as to how to perform soft mute, it is determined whether or not the change is more than a specified value by changing gently or suddenly.

  When the difference between the corrected reception parameter and the current reception parameter is equal to or greater than a predetermined threshold (step ST3; YES), the reception parameter setting unit 32 determines the corrected reception parameter calculated by the reception parameter calculation unit 52, The reception unit 3 including the reception demodulation unit 31 is set (step ST4). On the other hand, when the difference between the corrected reception parameter and the current reception parameter is less than the predetermined threshold (step ST3; NO), the process returns to step ST1 and the above process is repeated. Thus, every time the vehicle travels a predetermined travel distance, a reception parameter corresponding to the geographical condition of the area where the vehicle is located at that time is set in the receiving unit 3.

  When the area where the vehicle is located matches a plurality of geographical conditions, that is, when there is reception parameter correction information corresponding to a plurality of geographical conditions, the reception parameter calculation unit 52 performs the respective geographical conditions. The reception parameter is corrected with the correction information corresponding to, and the weighted average of these values is used as the corrected reception parameter. For example, a weight is set for each geographical condition.

  In addition, the case where the geographical condition is analyzed every time the own vehicle travels the predetermined travel distance has been described. However, the reception parameter may be updated by analyzing the geographical condition every predetermined time.

As described above, according to the first embodiment, detection is performed by the receiving unit 3 that receives radio waves from the broadcasting station, the position information detecting unit 4 that detects the position of the host vehicle, and the position information detecting unit 4. A position information analysis unit 51 that analyzes the geographical condition of the position of the vehicle, a data storage unit 53 that stores correction information corresponding to the geographical condition of the reception parameter that determines the reception characteristics of the reception unit 3, and a position information analysis A reception parameter calculation unit 52 that reads correction information corresponding to the geographical condition obtained by the analysis by the unit 51 from the data storage unit 53 and calculates a reception parameter corresponding to the geographical condition using the correction information; A reception parameter setting unit 32 that sets the reception parameter calculated by the parameter calculation unit 52 in the reception unit.
With this configuration, it is possible to set appropriate reception parameters based on the geographical conditions even in the first region.

  Further, according to the first embodiment, the navigation device includes the receiver 1 and the map DB 22 for storing map data, and the position of the vehicle detected by the position information detection unit 4 and the map data of the map DB 22 The navigation process is performed using With this configuration, it is possible to update the reception parameters in the receiver 1 and perform the navigation process in the navigation device unit 2 by using one position information detection unit 4. Thereby, simplification of an apparatus can be achieved.

  In the first embodiment, the case where the navigation device according to the present invention is applied to a vehicle-mounted navigation device is shown, but the present invention is not limited to this. For example, you may apply not only to vehicle-mounted but to a mobile telephone terminal or a personal digital assistant (PDA; Personal Digital Assistance). Moreover, you may apply to PND (Portable Navigation Device) etc. which a person carries and uses in moving bodies, such as a vehicle, a railroad, a ship, or an aircraft.

  In the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 Receiver, 2 Navigation apparatus part, 3 Reception part, 4 Position information detection part, 5 Reception parameter control part, 21 Navigation processing part, 22 Map DB, 31 Reception demodulation part, 32 Reception parameter setting part, 51 Position information analysis part 52 reception parameter calculation unit, 53 data storage unit.

Claims (2)

In a receiver mounted or held on a moving object,
A receiver for receiving radio waves from a broadcasting station;
A position information detector for detecting the position of the moving body;
An analysis unit for analyzing a geographical condition of the position of the moving object detected by the position information detection unit;
A storage unit that stores correction information corresponding to a geographical condition of a reception parameter that determines reception characteristics of the reception unit;
A calculation unit that reads correction information corresponding to the geographical condition obtained by the analysis by the analysis unit from the storage unit, and calculates a reception parameter corresponding to the geographical condition using the correction information;
A receiver comprising: a setting unit configured to set the reception parameter calculated by the calculation unit in the reception unit. A receiver according to claim 1;
A map database for storing map data,
The navigation apparatus which performs a navigation process using the position of the said mobile body detected by the said positional information detection part, and the map data of the said map database.

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