JPH0627354U - GPS receiving antenna installed in the rear spoiler for vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] A satellite signal from a GPS satellite is suitably received by a GPS receiving antenna provided in a rear spoiler for a vehicle. A flat main antenna 22 is attached to the upper surface of a rear spoiler 20 mounted at the rear end of an automobile 10, and a guide formed so that its center coincides with the central axis of the main antenna 22. A sub-antenna 24 composed of a wave device is provided. The sub antenna 24 can increase the antenna gain of the GPS receiving antenna 11 in the horizontal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a GPS receiving antenna mounted on a rear end of a vehicle and disposed in a rear spoiler for a vehicle, which realizes stable high-speed running performance by pressing the vehicle against a road surface by utilizing an air flow at a high speed. .

[0002]

[Prior art]

 In order to confirm or determine the current position, traveling speed, etc. of an object that moves from moment to moment, such as a ship or an aircraft, in recent years, the Global Positioning System (Grobal Positioning System) , Hereinafter, referred to as GPS). A GPS positioning device that processes the current position of a moving vehicle by receiving radio waves from multiple satellites belonging to this GPS can be used continuously at any time in the world (1). It has features such as (2) extremely high accuracy of position and speed measurement, and (3) unlimited number of users. Therefore, by using the GPS positioning device, it is possible to check the current position of the user in a short time, avoid traffic congestion in urban areas, and find a detour to a destination. If this is possible, it will be possible to obtain a very large profit in terms of time and money.

For example, as shown in FIG. 7, FIG. 8 and FIG. 9, a traveling vehicle 1 has a substantially flat antenna 2 for receiving radio waves from GPS satellites 6, 7, and a rear spoiler. The rear spoiler 3 is attached to a substantially central portion of the rear spoiler 3 along a top surface 4 thereof in a substantially horizontal state.

[0004]

[Problems to be solved by the device]

 By the way, it is preferable that the antenna 2 also receives radio waves from a GPS satellite 7 having a low elevation angle, but in the conventional example, the antenna 2 is attached in a substantially horizontal state along the upper surface 4 of the rear spoiler 3. . Therefore, in the rear and side directions of the antenna 2, as shown by the directivity pattern 8, the horizontal gain of the antenna 2 is insufficient, so that the radio wave from the GPS satellite 7 having a low elevation angle is in a good state. There is an inconvenience that you cannot receive it. As a result, it becomes difficult to receive satellite signals from low elevation satellites.

The present invention has been made in order to overcome the above-mentioned inconvenience, and a rear spoiler mounted on a rear end of a vehicle is provided with a waveguide from a director in the vicinity of a substantially flat main antenna. It is an object of the present invention to provide a GPS receiving antenna arranged in a rear spoiler for a vehicle, which can suitably receive satellite signals from a low elevation angle satellite by arranging the sub antenna.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a GPS receiving antenna arranged on a rear spoiler mounted on a rear end of a vehicle, wherein the GPS receiving antenna comprises a flat main antenna, It is characterized in that it is composed of a sub-antenna composed of a director provided close to the main antenna.

Further, the present invention is characterized in that the sub-antenna comprises a waveguide element formed at a position where the center of the sub-antenna coincides with the central axis of the main antenna.

Further, the present invention is characterized in that it comprises a plurality of directors formed at a position where the center of the director coincides with the central axis of the main antenna.

[0009]

[Action]

 The GPS receiving antenna provided in the vehicle rear spoiler according to the present invention is provided with a sub-antenna composed of a director in the vicinity of the main antenna, so that signals from low-elevation satellites at the rear and side of the vehicle are provided. Since the antenna gain for the satellite is increased, satellite signals from low elevation satellites can be properly received.

[0010]

Embodiments A GPS receiving antenna arranged in a vehicle rear spoiler according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an automobile 10 to which a GPS receiving antenna 11 according to the present invention is attached, and FIG. 2 is a perspective view showing a state where the GPS receiving antenna 11 is installed in a rear spoiler 20 of the automobile 10. It is a figure.

As shown in FIG. 1, an automobile 10 includes a body 12, a roof 14 integrally formed on the upper portion of the body 12, and wheels 16. A rear spoiler 20 is attached to the trunk lid 18 at the rear end of the body 12. The rear spoiler 20 exerts a driving force and a braking force by pushing the vehicle body of the automobile 10 against the road surface by the air flow flowing along the surface of the rear spoiler 20 while the automobile 10 is traveling at high speed. . The GPS receiving antenna 11 is attached to the substantially central portion of the rear spoiler 20.

As shown in FIG. 2, the GPS receiving antenna 11 has a substantially planar main antenna 22 and a position close to the main antenna 22 and aligned with the central axis of the main antenna 22. It is composed of a sub-antenna 24 formed of a director. This sub-antenna 24 sets the length of the element of the sub-antenna 24 and the dimension of the relative position between the main antenna 22 and the sub-antenna 24 to predetermined values, thereby making the antenna gain of the main antenna 22 in the horizontal direction. It is raised as shown in FIG.

The GPS receiving antenna 11 arranged in the vehicle rear spoiler 20 of the present embodiment is basically configured as described above, and next receives radio waves from the GPS satellites S1 to S4. Then, a case where the current position of the traveling vehicle 10 is measured by this will be described.

First, the overall configuration of the GPS receiver will be briefly described. That is, as shown in FIG. 3, in the GPS reception unit 28 that processes the transmission radio wave from the GPS reception antenna 11, the transmission radio wave modulated by the PN code is frequency-converted by the frequency converter and is amplified. , Is introduced into the correlator, and in this correlator, PN demodulation is performed by the signal sent from the PN code generator mounted on the automobile 10. That is, as shown in FIG. 4, since the transmission radio waves from the GPS satellites S1 to S4 are spread spectrum by the PN code, here, they are despread by the signal from the PN code generator, and then, Synchronous detection is performed. This synchronous detection signal is reintroduced into the PN code generator, and the signal generation control of the PN code generator is performed so that it is despread with the radio wave including the PN code that is constantly transmitted. On the other hand, the signals related to the received radio waves thus obtained are counted based on the clock frequency sent from the reference oscillator to obtain pseudo distance data.

That is, here, since there is a clock offset between the timing device mounted on the automobile 10 and the atomic clocks mounted on the GPS satellites S1 to S4, the distance data including this clock offset is simulated. Distance data is obtained. This pseudo distance data is sent to the arithmetic processing unit 30 and can be obtained by arithmetically processing the current position information of the automobile 10.

Therefore, when the radio waves transmitted from the GPS satellites S1 to S4 are received by the GPS receiving antenna 11, the control unit 32 performs optimum positioning of the traveling vehicle 10 with respect to the GPS receiving unit 28. Command the selection signal of the GPS satellite to transmit.

In this way, when measuring the traveling speed, the position, and the current position of the automobile 10 using the GPS satellites S1 to S4, the optimum GPS satellite that has the best geometrical positioning accuracy is obtained. Select. When the GPS receiving unit 28 obtains the pseudo distances to the selected four GPS satellites S1 to S4 by the process, the arithmetic processing unit 30 has already received the pseudo distance data and the pseudo distance data. It is possible to obtain the current position of the vehicle 10 by formulating four navigation formulas by the positions of the four GPS satellites S1 to S4 derived from the obtained navigation message data and solving them. It will be possible. In this way, the current position (latitude, longitude, altitude), traveling direction, speed, clock offset of the GPS navigation device, etc. of the automobile 10 obtained by solving the navigation equation are once sent to the memory 34 and stored therein. . On the other hand, these data are sent to the display unit 36, and at least the current position of the automobile 10 can be displayed on the screen.

Here, as shown in FIG. 4, for example, with respect to radio waves transmitted from the rear and side directions of the automobile 10, the sub antenna 24 formed so as to coincide with the central axis of the flat main antenna 22. The directional pattern 26 of the GPS receiving antenna 11 can be provided in the horizontal direction due to the arrangement of the. As a result, the antenna gain in the horizontal direction is increased, so that it is possible to receive signals from the low-elevation angle satellite S3 and side low-elevation angle satellites, which are lower than in the conventional case. In this case, as shown by the directional pattern 26 in FIG. 4, the GPS reception antenna 11 has an increased antenna gain, particularly for a signal from the GPS satellite S3 behind the automobile 10, and the directional pattern in FIG. As shown in the pattern 26, the antenna gain for the signal from the low-elevation-angle GPS satellite on the side of the automobile 10 also increases, and the satellite signal can be preferably received.

Next, FIG. 6 shows a state in which the GPS receiving antenna 23 according to another embodiment is arranged in the rear spoiler 20. The same components as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, the sub-antennas 38 a to 38 d, each of which is composed of a plurality of arc-shaped directors whose center coincides with the central axis of the flat main antenna 22, are symmetrically arranged on the upper surface of the rear spoiler 20. ing. In this case, the sub antennas 38a to 38d can increase the antenna gain in the horizontal direction (longitudinal direction of the rear spoiler 20) on the side surface of the vehicle 10.

[0022]

[Effect of device]

 According to the GPS receiving antenna provided in the vehicle rear spoiler according to the present invention, the following effects can be obtained.

That is, by providing a sub-antenna composed of a director in the vicinity of the main antenna attached to the upper surface of the rear spoiler, the antenna gain for signals from low elevation angle satellites in the rear and side of the vehicle is provided. Therefore, the satellite signal from the low elevation satellite can be properly received.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a GPS receiving antenna according to the present invention is arranged in a rear spoiler of an automobile.

FIG. 2 is a perspective view showing a state in which the GPS receiving antenna is arranged in a rear spoiler of an automobile.

FIG. 3 is an explanatory diagram of a block circuit of a GPS receiving device and the like.

FIG. 4 is an explanatory diagram showing a relationship between a GPS receiving antenna arranged on a rear spoiler of an automobile and a GPS satellite.

FIG. 5 is a partial cross-sectional view showing a directivity pattern of a GPS receiving antenna arranged in a rear spoiler of an automobile.

FIG. 6 is a perspective view showing a state in which a GPS receiving antenna according to another embodiment is arranged in a rear spoiler of an automobile.

FIG. 7 is a perspective view showing a state in which an antenna according to a conventional example is arranged in a rear spoiler of an automobile.

FIG. 8 is a partial cross-sectional view showing a state in which an antenna according to a conventional example is arranged in a rear spoiler of an automobile.

FIG. 9 is a partial cross-sectional view showing a state in which an antenna according to a conventional example is arranged in a rear spoiler of an automobile.

[Explanation of symbols]

 10 ... Automobile 11,23 ... GPS receiving antenna 20 ... Rear spoiler 22 ... Main antenna 24,38a-38d ... Sub antenna 26 ... Directivity pattern

Claims (3)

[Scope of utility model registration request] 1. A GPS receiving antenna arranged on a rear spoiler mounted on a rear end of a vehicle, wherein the GPS receiving antenna is a flat plate-shaped main antenna and a guiding antenna provided in proximity to the main antenna. A GPS receiving antenna arranged in a rear spoiler for a vehicle, characterized in that the GPS receiving antenna comprises a sub-antenna composed of a wave device. 2. The vehicle rear spoiler according to claim 1, wherein the sub-antenna comprises a director element formed at a position where a center of the sub-antenna coincides with a central axis of the main antenna. GPS receiver antenna installed. 3. The rear spoiler for a vehicle according to claim 1, wherein the director comprises a plurality of directors formed at positions whose centers coincide with the central axis of the main antenna. GPS receiving antenna installed in.