Spread spectrum radio control system for models
First Claim
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1. A remote control system, comprising:
- a controlled device having a plurality of servo systems;
a signal generator for providing fixed length digital control signals relating to each of a plurality of servo systems;
a transmitter coupled to receive the fixed length digital control signals and for modulating a transmission signal with the fixed length digital control signals;
a receiver for receiving the transmission signal and recovering the fixed length digital control signals; and
a servo control signal generator coupled to receive the recovered fixed length digital control signals and responsive thereto for generating servo control signals sorted by servo system to be controlled.
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Abstract
The invention provides for the radio control of model airplanes, cars, helicopters and the like using frequency hopping spread spectrum transmissions, preferably in the Industrial Scientific Medical (ISM) spectrum bands. A method and apparatus for translation of pulse duration modulation (PDM) servo control signals into digital signals for application to a spread spectrum transmitter in hand held control units and for their recovery in the models are provided.
24 Citations
24 Claims
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1. A remote control system, comprising:
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a controlled device having a plurality of servo systems;
a signal generator for providing fixed length digital control signals relating to each of a plurality of servo systems;
a transmitter coupled to receive the fixed length digital control signals and for modulating a transmission signal with the fixed length digital control signals;
a receiver for receiving the transmission signal and recovering the fixed length digital control signals; and
a servo control signal generator coupled to receive the recovered fixed length digital control signals and responsive thereto for generating servo control signals sorted by servo system to be controlled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A remote control system, comprising:
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a controlled device having a plurality of servo systems;
a controller having a positionable input device;
a pulse generator responsive to the positionable input device for generating a pulse duration modulated signal in which successive pulses in a string of pulses are associated with one each of the plurality of servo systems;
a converter connected to receive the pulse duration modulated signal for measuring the duration of each pulse, quantizing the measurements and encoding the measurements as fixed length digital code;
a spread spectrum transmitter connected to receive the fixed length digital code, for modulating successive carriers with the fixed length digital code and transmitting the modulated carriers;
a receiver installed on the controlled device for receiving the modulated carriers and recovering the fixed length digital code; and
a decoder installed on the controlled device and connected to receive the fixed length digital code for regenerating the pulses and applying the pulses to the appropriate servo systems. - View Dependent Claims (11, 12, 13)
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14. A control system for servos installed on a model vehicle, where particular servos are controlled by the application thereto of variable duration pulses, the control system comprising:
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a source of sets of fixed length digital code identified with the particular servos;
a spread spectrum transceiver coupled to receive the sets of fixed length digital code and modulating successive carriers with the sets of fixed length digital code for transmission;
a receiver installed on the model vehicle for receiving the successive carriers and recovering the sets of fixed length digital code;
a decoder installed on the model vehicle and coupled to receive the recovered sets of fixed length digital code, the decoder providing for sorting the sets of fixed length digital code by servo and for generating variable duration pulses for the servos from the fixed length digital code. - View Dependent Claims (15, 16, 17)
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18. A method of encoding and decoding a series of pulse duration modulated signals for digital transmission, the method comprising the steps of:
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measuring the duration of the pulse duration modulated signals;
assigning each successive pulse duration modulated signal an identifying flag based on position in the series;
quantizing the measured duration of each pulse duration modulated signal and placing the identifying flag and the quantization into a fixed length digital code set for each pulse duration modulated signal;
providing first and second transceivers;
providing the sets of fixed length digital code to the first transceiver for broadcast;
receiving the sets of fixed length digital code on the second transceiver;
sorting the sets of fixed length digital code based on flag values; and
regenerating pulse duration modulation signals from the quantization values. - View Dependent Claims (19, 20, 21, 22)
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23. A wireless system for controlling model vehicles from a hand held control unit, comprising:
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a plurality of positionable input devices on the hand held control unit;
a control pulse generator for converting positions of the positionable input devices into channel pulses, sequences of which are separated by reference pulses in the hand held control unit;
a converter operating on the sequences of channel pulses and reference pulses to generate serial digital data identified by channel in the hand held control unit;
a first spread spectrum transceiver for broadcasting the serial digital data from the hand held control unit;
a second spread spectrum transceiver for receiving the serial digital data at the model vehicle; and
a decoder operating on the serial digital data to sort the data and regenerating channel pulses therefrom. - View Dependent Claims (24)
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Specification