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Automatic calibration system for distance measurement receivers
| Details |
Inventors: Regnier, John A.; Savage, Edward;
Assignee: Eaton Corporation (Cleveland, OH)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A receiver time delay calibration device designed for low cost retrofitting of airborne equipment and more specifically DME equipment. In this system, the output of a VFO is applied to the RF input port of the receiver to be tested. The VFO is swept through a frequency range of the receiver until the receiver provides an output, which occurs at the operating frequency of the receiver, f.sub.t. The receiver's output at f.sub.t is used to stop the sweep of the VFO and maintain it at f.sub.t. The output of the VFO is then pulse modulated and the delay between the RF pulse applied to the input of the receiver and the corresponding video output pulse from the receiver is measured to determine the receiver delay time. |
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DETAILED DESCRIPTION OF THE INVENTION FIG.
1 is a block diagram of the basic system without automatic controls.
The system of FIG.
2 comprises a TACAN unit 101, a TACAN antenna 102, a circulator 103, an AGC converter 104, an RF switch 105, a pin diode attenuator 106, a test signal generator 107, a directional coupler 108, a pin diode switch 109, a voltage control oscillator (VCO) 110 (referred to as either a VCO or VFO, Variable Frequency Oscillator), a detector 111, and a delay timer 112.
The TACAN unit 101 receives an output signal from the circulator 103 and provides two output signals, one an automatic gain control signal supplied to the automatic gain control inverter 104, and the second, a buffered receiver video output supplied to the signal generator 107 and the delay timer 112.
The test signal generator 107 provides three output signals.
The first is a test mode signal supplied to the RF switch to change the switch's position, a test pulse signal which is supplied to pin diode switch 108, and a sweep control voltage which is supplied to the voltage control oscillator 110.
The voltage control oscillator has one output which is supplied through the pin diode switch 109 to the directional coupler 108.
The directional coupler 108 has two outputs, one of which supplies the detector 111, while the other supplies the pin diode attenuator 106.
The detector 111 has one output which supplies the delay timer.
The AGC inverter has one output which supplies the pin diode attenuator 106.
The circulator 103 has four ports.
The first port is connected to the antenna 102, the second to a first input port of the RF switch 105, the third to the output of the RF switch 105 and the fourth to the input of the TACAN unit 101.
The RF switch has a second input port which accepts the output from the pin diode attenuator 106.
In the operation of the circuit shown in FIG.
1, the first step is to determine the operating frequency of the TACAN unit 101.
This is accomplished by supplying a swept RF signal to the input of the receiver and noting the frequency at which a buffered receiver video output is received
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Radio 
