Data compression method for telemetry of vibration data
First Claim
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1. A method for compressing vibration data for telemetry from a missile or spacecraft while allowing complete assessment of important vibration modes, comprising the steps of:
- (a) sensing the missile vibration at a predetermined sample rate with at least one strain gauge to generate raw vibration data;
(b) splitting the signal into a first and a second signal path, the paths being electrically connected in parallel;
(c) filtering the raw vibration data in the first signal path to obtain an uncompressed low frequency component suitable for transmission;
(d) frequency analyzing the data in the second signal path into compressed frequency/amplitude data suitable to identify sources of high frequency vibrations; and
(e) multiplexing the compressed frequency/ amplitude data with the low frequency component without further signal processing of either component to provide a mixed signal, the mixed signal being compressed from the raw signal and being suitable for efficient transmission.
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Abstract
Vibrational data is compressed about 8.5 to 18 times by isolating a low frequency component from the signal, frequency analyzing the signal to obtain important frequency/amplitude data, and recombining the low frequency component with the analyzed information for efficient transmission.
26 Citations
19 Claims
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1. A method for compressing vibration data for telemetry from a missile or spacecraft while allowing complete assessment of important vibration modes, comprising the steps of:
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(a) sensing the missile vibration at a predetermined sample rate with at least one strain gauge to generate raw vibration data; (b) splitting the signal into a first and a second signal path, the paths being electrically connected in parallel; (c) filtering the raw vibration data in the first signal path to obtain an uncompressed low frequency component suitable for transmission; (d) frequency analyzing the data in the second signal path into compressed frequency/amplitude data suitable to identify sources of high frequency vibrations; and (e) multiplexing the compressed frequency/ amplitude data with the low frequency component without further signal processing of either component to provide a mixed signal, the mixed signal being compressed from the raw signal and being suitable for efficient transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A telemetry data compression system for compressing vibration data generated on a missile or spacecraft, comprising:
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(a) means for sensing the vibration and for creating a vibration signal at a predetermined sample rate; (b) means for splitting the vibration signal into a first and second signal path, the paths being electrically connected in parallel; (c) a filter along the first path to isolate a low frequency component from the vibration signal; (d) a frequency spectral analyzer along the second path for analyzing the parallel vibrational signal into an analyzed component having frequency/amplitude bands across the signal bandwidth, the bands being representative of the important vibrational modes contained within the signal; and (e) a multiplexer connected to the filter and the analyzer for combining the low frequency component with the analyzed component for transmission of the compressed data without further signal processing of either component. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification