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INSTRUCTION MANUAL
GPS RECEIVER UNIT
HHGP1
© TOSHIBA Corporation 2001
All Rights Reserved.
( Ver. 1.6 )
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6 F 2 S 0 7 3 8 Safety Precautions Before using this product, please read this chapter carefully. This chapter describes the safety precautions recommended when using the GPS receiver unit type HHGP1. Before installing and using the equipment, this chapter must be thoroughly read and understood. Explanation of symbols used Signal words such as DANGER, WARNING, and two kinds of CAUTION, will be followed by important safety information that must be carefully reviewed. Indicates an
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6 F 2 S 0 7 3 8 DANGER • Installing arrester Install a surge arrester between the antenna and the GPS receiver and ground it in accordance with the guidelines in this manual. Otherwise, it may cause electric shocks, injury or malfunction. WARNING • Exposed terminals Do not touch the terminals of this equipment while the power is on, as the high voltage generated is dangerous. • Residual voltage Hazardous voltage can be present in the DC circuit just after switching off the D
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6 F 2 S 0 7 3 8 Contents Safety Precautions 1 1. Introduction 5 2. Characteristics 5 3. Configuration 6 3.1 Configuration of GPS Receiver Unit 6 3.2 Outline of GPS Receiver Unit and Function 7 4. Handling 8 4.1 Setting the GPS Receiver Unit 8 4.2 How to Turn on the Power 9 4.3 Checking the 1PPS Signal 9 5. Operation 10 5.1 1PPS Signal Output 10 5.2 Time Data Output 11 6. Installation 12 6.1 Receipt of GPS Receiver Unit 12 6.2 Installing GPS Receiver Unit 12 6.3 Installing A
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6 F 2 S 0 7 3 8 Appendix A Outline of GPS Rceiver Unit 21 Appendix B Technical Data 23 Appendix C Specification of Recommended Antenna and Arrester 27 Appendix D Supplement 31 The data given in this manual are subject to change without notice. (Ver. 1.6) 4
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6 F 2 S 0 7 3 8 1. Introduction The GPS (Global Positioning System) receiver unit is a device that receives the information from satellites and outputs time signals synchronous to UTC (Universal Coordinated Time) to external devices. The GPS receiver unit provides multiple outputs with optical signals for noise immunity. 2. Characteristics ■ Highly accurate time signal output Realizes a precision with respect to ±2 µs for UTC (UTC: Universal Coordinated Time) (excluding the propaga
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6 F 2 S 0 7 3 8 3. Configuration 3.1 Configuration of GPS Receiver Unit Figure 3.1.1 shows the configuration of the GPS receiver unit. The GPS receiver unit receives electromagnetic signals from satellites through an antenna and outputs time data to external devices. Through an internal receiver, the unit generates serial time data and 1-second pulses (1PPS signals), based on the received electromagnetic signal. Each 1PPS signal occurs at the instant in time given by its accompanying
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6 F 2 S 0 7 3 8 3.2 Outline of GPS Receiver Unit and Function Figure 3.2.1 shows outline and functions of GPS receiver unit. ④ FRONT VIEW ①③ ② ⑥ ⑦ ⑤ REAR VIEW 48V ⑧ No. Device Indication Functions Yellow LED 5 V Turns on when the power (5Vdc) is supplied. ① Yellow LED 1PPS OUT Blinks when 1PPS signals are output synchronously with UTC. ② Red LED ERROR Turns on when the internal crystal oscillator stops. ③ DIP switches DSW Set the GPS receiver unit settings. During o
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6 F 2 S 0 7 3 8 4. Handling 4.1 Setting the GPS Receiver Unit The GPS receiver unit is set in accordance with the requirements of the system by using the DIP switches located on the front panel of the unit. To prevent erroneous operations, the DIP switches are protected with a cover. As shown in Figure 4.1.1, when the cover is rotated after loosening the cover screw with a screwdriver, the switches are exposed thus making it possible to handle them. Switches are handled with a sharp
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6 F 2 S 0 7 3 8 Table 4.1 Setting the Switches Setting Switch Function No. ON OFF (default) 1 Location mode Location fixing mode Location estimation mode change 2 Reliability/TRAIM Normal/TRAIM OFF High-reliability/TRAIM ON mode change 3 Optical level test Continuous light emission Normal light emission 4 Clock range 2020 – 2039 (Year) 2001 – 2019 (Year) change Note: Settings can be changed when the power is ON, but changes are not valid until the power has been switched OFF
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6 F 2 S 0 7 3 8 5. Operation 5.1 1PPS Signal Output The GPS receiver unit outputs 1PPS signals with each pulse defining the instant of time described by the preceding frame of serial data. (For the time signal transmission format, refer to Appendix D.) Following power-up, the GPS receiver begins outputting 1PPS signals after the acquisition of the almanac data and the estimation of the receiver location (or the antenna location to be more exact) are completed. Almanac data received
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6 F 2 S 0 7 3 8 Number of receivable satellite signals Five receivable satellite signals Four receivable satellite signals 6 5 Two receivable 4 satellite signals 3 One receivable satellite signal 2 1 Time 0 1PPS output Stop 1PPS output Power ON (In the case of normal mode) Almanac data reception 1PPS output 1PPS stop 1PPS output (12 to 30 minutes) (In the case of high- reliability mode) Figure 5.1.1 Receiving Satellite Signals and 1PPS Output Status 5.2 Time Data Out
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6 F 2 S 0 7 3 8 6. Installation 6.1 Receipt of GPS Receiver Unit When GPS receiver units are received, carry out the acceptance inspection immediately. In particular, check for damage during transportation, and if any is found, contact the vendor. Always store the GPS receiver units in a clean, dry environment. 6.2 Installing GPS Receiver Unit CAUTION Do not remove flanges from the main unit, as this may cause a failure. The flanges attached to both sides of the unit are used to fix
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6 F 2 S 0 7 3 8 Don’t locate in shade of obstructing objects (Box, antenna, etc.). Don’t locate in shade of obstructing objects (Box, antenna, etc.) Next, connect the antenna to the arrestor with a coaxial cable. The following antennas are recommended: GPA-014B or GPA-017S manufactured by Furuno Electric Co., Ltd. The specifications for and dimensions of these antennas are described in Appendix C. The antenna should be fixed to a support pole with Debe clamps and U bolts. An exam
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6 F 2 S 0 7 3 8 Debe clamp Antenna Connector junction Insulation treatment (Autofusion tape, vinyl tape or water-proof cap) Fix the cable to the support cable by making a circle while making sure the cable is long enough. Coaxial cable Support pole ( φ38 to 64) Figure 6.3.2 An Example of Installation, Using GPA-014B for Antenna (A) Antenna Parker clamp Leave the connector slightly loose so Auxiliary mounting that no excessive force is applied. bracket Connector junction.
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6 F 2 S 0 7 3 8 6.4 Installing Surge Arrester The GPS antenna must be installed outdoors, so a surge arrestor is required as a measure against induced surges due to lightening. (This is not effective against a direct lightening strike.) The arrestor should be installed at the point where the coaxial cable from the antenna enters the building. A recommended arrestor is CA-23RS made by Daiichi Denpa Kogyo. The specifications for and the appearance diagram of the arrestor are described in
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6 F 2 S 0 7 3 8 6.6 Connecting the Power Supply and the Earthing Terminal Connect the 48Vdc power cable and the earth cable to the terminal block with M4 crimped terminals. For safety purposes, make sure that the earth connection is reliable. CAUTION The earthing terminal must be securely earthed. The failure to ground may cause malfunctions, electric shocks or injury. Fibre optic cable to relay P 48V N E Adapter Earth Antenna Adapter Co - axial cable Ar
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6 F 2 S 0 7 3 8 7. Preparation for Installation The following issues should be considered prior to commencing installation of the system. 7.1 Selecting an Antenna and Cables The choice of antenna and cable types should be made based on the distance from the antenna installation site to the GPS receiver unit installation site, and also on the cabling conditions. Coaxial cables of characteristic impedance 50 ohms are required. The signal frequency is 1.57GHz. The antennas may be select
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6 F 2 S 0 7 3 8 7.3 Selecting an Antenna Installation Location CAUTION If antenna is not located in the method described below, it may not be possible to receive the GPS signal correctly. Obstructing object is not allowed in this area. 15°(maximum) Antenna Support pole （fix to fence etc.） Roof of building Neighbouring building The antenna is installed outdoors to receive satellite transmissions. It should be installed in a location that offers an unobstructed view of the sky w
