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In target environments that include Electronics Countermeasures (ECM), where the availability of radar range measurements is severely reduced, an integration of ESM into a multi-sensor tracker provides an inexpensive but effective approach to augmenting radar tracking systems. Tracking filter equations are presented for a multi heterogeneous-sensor tracking system consisting of radars and ESM sensors. Measurement time-based track updating is performed, due to non-periodicity of ESM measurement acquisition times, instead of usual track-based updates. Track updating using ESM measurements is accomplished via an EKF-based algorithm and radar measurements via an alpha-beta tracking algorithm. The integration of data from different sensor types is a logical response to increasingly hostile airborne threats. The technique described in this paper is a straightforward and cost effective approach for accomplishing that integration.