Generator for agile frequency signals
First Claim
1. A test system including a generator for generating an agile frequency test signal for testing a test radio where the test radio has specifications for operating in a communications system comprising, a signal component source for providing signal components including test parameters and including a test sequence and test symbols derived from radio transmissions of the communications system, a signal generator for digitally processing the test sequence, the test symbols and test parameters to form an agile test signal, a transmitter for transmitting the test signal to the test radio.
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Accused Products
Abstract
The subject of this patent is a system to generate RF frequency hopped signals that can be used to test radio receivers over the range of their signal specifications. The hop sequence and symbols in the signal is decoded from signals transmitted by the same or different radio of the same specification. The system can set various signal parameters to any prescribed value. These parameters include carrier frequency error, bit rate error, rise and fall times, amplitude ripple and roll off, modulation depth, nonlinearities, burst duration, burst start time and burst interval. Signal interference can be added to the signal including tones, other signals, noise and other signals of the same as the test radio. Similarly other communications equipment can be tested by the combination of receiving and demodulating a transmitted and regenerating the signal with the same symbols with specified signal parameters.
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Citations
42 Claims
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1. A test system including a generator for generating an agile frequency test signal for testing a test radio where the test radio has specifications for operating in a communications system comprising,
a signal component source for providing signal components including test parameters and including a test sequence and test symbols derived from radio transmissions of the communications system, a signal generator for digitally processing the test sequence, the test symbols and test parameters to form an agile test signal, a transmitter for transmitting the test signal to the test radio.
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31. A test system including a generator for generating an agile frequency test signal for testing a test radio where the test radio has specifications for operating in a communications system comprising,
a receiver for receiving a frequency hopping radio input signal transmitted in the communications system, said input signal having segments at different hopping frequencies and different hopping times, a broadband processor for processing said input signal to determine signal components, and for each segment, determining from the input signal a hopping time of the segment, determining from the input signal a frequency of the segment, and determining signal parameters, a signal component memory for storing said signal components including a test sequence, test symbols and test parameters, a signal generator for digitally processing the test sequence, the test symbols and test parameters to form an agile test signal, a transmitter for transmitting the test signal to the test radio.
Specification